/*
 * nct6775 - Driver for the hardware monitoring functionality of
 *             Nuvoton NCT677x Super-I/O chips
 *
 * Copyright (C) 2012  Guenter Roeck <linux@roeck-us.net>
 *
 * Derived from w83627ehf driver
 * Copyright (C) 2005-2012  Jean Delvare <khali@linux-fr.org>
 * Copyright (C) 2006  Yuan Mu (Winbond),
 *                     Rudolf Marek <r.marek@assembler.cz>
 *                     David Hubbard <david.c.hubbard@gmail.com>
 *                     Daniel J Blueman <daniel.blueman@gmail.com>
 * Copyright (C) 2010  Sheng-Yuan Huang (Nuvoton) (PS00)
 *
 * Shamelessly ripped from the w83627hf driver
 * Copyright (C) 2003  Mark Studebaker
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * Supports the following chips:
 *
 * Chip        #vin    #fan    #pwm    #temp  chip IDs       man ID
 * nct6106d     9      3       3       6+3    0xc450 0xc1    0x5ca3
 * nct6775f     9      4       3       6+3    0xb470 0xc1    0x5ca3
 * nct6776f     9      5       3       6+3    0xc330 0xc1    0x5ca3
 * nct6779d    15      5       5       2+6    0xc560 0xc1    0x5ca3
 * nct6791d    15      6       6       2+6    0xc800 0xc1    0x5ca3
 *
 * #temp lists the number of monitored temperature sources (first value) plus
 * the number of directly connectable temperature sensors (second value).
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include "lm75.h"

#define USE_ALTERNATE

enum kinds { nct6106, nct6775, nct6776, nct6779, nct6791 };

/* used to set data->name = nct6775_device_names[data->sio_kind] */
static const char * const nct6775_device_names[] = {
        "nct6106",
        "nct6775",
        "nct6776",
        "nct6779",
        "nct6791",
};

static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");

static unsigned short fan_debounce;
module_param(fan_debounce, ushort, 0);
MODULE_PARM_DESC(fan_debounce, "Enable debouncing for fan RPM signal");

#define DRVNAME "nct6775"

/*
 * Super-I/O constants and functions
 */

#define NCT6775_LD_ACPI         0x0a
#define NCT6775_LD_HWM          0x0b
#define NCT6775_LD_VID          0x0d

#define SIO_REG_LDSEL           0x07    /* Logical device select */
#define SIO_REG_DEVID           0x20    /* Device ID (2 bytes) */
#define SIO_REG_ENABLE          0x30    /* Logical device enable */
#define SIO_REG_ADDR            0x60    /* Logical device address (2 bytes) */

#define SIO_NCT6106_ID          0xc450
#define SIO_NCT6775_ID          0xb470
#define SIO_NCT6776_ID          0xc330
#define SIO_NCT6779_ID          0xc560
#define SIO_NCT6791_ID          0xc800
#define SIO_ID_MASK             0xFFF0

enum pwm_enable { off, manual, thermal_cruise, speed_cruise, sf3, sf4 };

static inline void
superio_outb(int ioreg, int reg, int val)
{
        outb(reg, ioreg);
        outb(val, ioreg + 1);
}

static inline int
superio_inb(int ioreg, int reg)
{
        outb(reg, ioreg);
        return inb(ioreg + 1);
}

static inline void
superio_select(int ioreg, int ld)
{
        outb(SIO_REG_LDSEL, ioreg);
        outb(ld, ioreg + 1);
}

static inline int
superio_enter(int ioreg)
{
        /*
         * Try to reserve <ioreg> and <ioreg + 1> for exclusive access.
         */
        if (!request_muxed_region(ioreg, 2, DRVNAME))
                return -EBUSY;

        outb(0x87, ioreg);
        outb(0x87, ioreg);

        return 0;
}

static inline void
superio_exit(int ioreg)
{
        outb(0xaa, ioreg);
        outb(0x02, ioreg);
        outb(0x02, ioreg + 1);
        release_region(ioreg, 2);
}

/*
 * ISA constants
 */

#define IOREGION_ALIGNMENT      (~7)
#define IOREGION_OFFSET         5
#define IOREGION_LENGTH         2
#define ADDR_REG_OFFSET         0
#define DATA_REG_OFFSET         1

#define NCT6775_REG_BANK        0x4E
#define NCT6775_REG_CONFIG      0x40

/*
 * Not currently used:
 * REG_MAN_ID has the value 0x5ca3 for all supported chips.
 * REG_CHIP_ID == 0x88/0xa1/0xc1 depending on chip model.
 * REG_MAN_ID is at port 0x4f
 * REG_CHIP_ID is at port 0x58
 */

#define NUM_TEMP        10      /* Max number of temp attribute sets w/ limits*/
#define NUM_TEMP_FIXED  6       /* Max number of fixed temp attribute sets */

#define NUM_REG_ALARM   7       /* Max number of alarm registers */
#define NUM_REG_BEEP    5       /* Max number of beep registers */

#define NUM_FAN         6

/* Common and NCT6775 specific data */

/* Voltage min/max registers for nr=7..14 are in bank 5 */

static const u16 NCT6775_REG_IN_MAX[] = {
        0x2b, 0x2d, 0x2f, 0x31, 0x33, 0x35, 0x37, 0x554, 0x556, 0x558, 0x55a,
        0x55c, 0x55e, 0x560, 0x562 };
static const u16 NCT6775_REG_IN_MIN[] = {
        0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x555, 0x557, 0x559, 0x55b,
        0x55d, 0x55f, 0x561, 0x563 };
static const u16 NCT6775_REG_IN[] = {
        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x550, 0x551, 0x552
};

#define NCT6775_REG_VBAT                0x5D
#define NCT6775_REG_DIODE               0x5E
#define NCT6775_DIODE_MASK              0x02

#define NCT6775_REG_FANDIV1             0x506
#define NCT6775_REG_FANDIV2             0x507

#define NCT6775_REG_CR_FAN_DEBOUNCE     0xf0

static const u16 NCT6775_REG_ALARM[NUM_REG_ALARM] = { 0x459, 0x45A, 0x45B };

/* 0..15 voltages, 16..23 fans, 24..29 temperatures, 30..31 intrusion */

static const s8 NCT6775_ALARM_BITS[] = {
        0, 1, 2, 3, 8, 21, 20, 16,      /* in0.. in7 */
        17, -1, -1, -1, -1, -1, -1,     /* in8..in14 */
        -1,                             /* unused */
        6, 7, 11, -1, -1,               /* fan1..fan5 */
        -1, -1, -1,                     /* unused */
        4, 5, 13, -1, -1, -1,           /* temp1..temp6 */
        12, -1 };                       /* intrusion0, intrusion1 */

#define FAN_ALARM_BASE          16
#define TEMP_ALARM_BASE         24
#define INTRUSION_ALARM_BASE    30

static const u16 NCT6775_REG_BEEP[NUM_REG_BEEP] = { 0x56, 0x57, 0x453, 0x4e };

/*
 * 0..14 voltages, 15 global beep enable, 16..23 fans, 24..29 temperatures,
 * 30..31 intrusion
 */
static const s8 NCT6775_BEEP_BITS[] = {
        0, 1, 2, 3, 8, 9, 10, 16,       /* in0.. in7 */
        17, -1, -1, -1, -1, -1, -1,     /* in8..in14 */
        21,                             /* global beep enable */
        6, 7, 11, 28, -1,               /* fan1..fan5 */
        -1, -1, -1,                     /* unused */
        4, 5, 13, -1, -1, -1,           /* temp1..temp6 */
        12, -1 };                       /* intrusion0, intrusion1 */

#define BEEP_ENABLE_BASE                15

static const u8 NCT6775_REG_CR_CASEOPEN_CLR[] = { 0xe6, 0xee };
static const u8 NCT6775_CR_CASEOPEN_CLR_MASK[] = { 0x20, 0x01 };

/* DC or PWM output fan configuration */
static const u8 NCT6775_REG_PWM_MODE[] = { 0x04, 0x04, 0x12 };
static const u8 NCT6775_PWM_MODE_MASK[] = { 0x01, 0x02, 0x01 };

/* Advanced Fan control, some values are common for all fans */

static const u16 NCT6775_REG_TARGET[] = {
        0x101, 0x201, 0x301, 0x801, 0x901, 0xa01 };
static const u16 NCT6775_REG_FAN_MODE[] = {
        0x102, 0x202, 0x302, 0x802, 0x902, 0xa02 };
static const u16 NCT6775_REG_FAN_STEP_DOWN_TIME[] = {
        0x103, 0x203, 0x303, 0x803, 0x903, 0xa03 };
static const u16 NCT6775_REG_FAN_STEP_UP_TIME[] = {
        0x104, 0x204, 0x304, 0x804, 0x904, 0xa04 };
static const u16 NCT6775_REG_FAN_STOP_OUTPUT[] = {
        0x105, 0x205, 0x305, 0x805, 0x905, 0xa05 };
static const u16 NCT6775_REG_FAN_START_OUTPUT[] = {
        0x106, 0x206, 0x306, 0x806, 0x906, 0xa06 };
static const u16 NCT6775_REG_FAN_MAX_OUTPUT[] = { 0x10a, 0x20a, 0x30a };
static const u16 NCT6775_REG_FAN_STEP_OUTPUT[] = { 0x10b, 0x20b, 0x30b };

static const u16 NCT6775_REG_FAN_STOP_TIME[] = {
        0x107, 0x207, 0x307, 0x807, 0x907, 0xa07 };
static const u16 NCT6775_REG_PWM[] = {
        0x109, 0x209, 0x309, 0x809, 0x909, 0xa09 };
static const u16 NCT6775_REG_PWM_READ[] = {
        0x01, 0x03, 0x11, 0x13, 0x15, 0xa09 };

static const u16 NCT6775_REG_FAN[] = { 0x630, 0x632, 0x634, 0x636, 0x638 };
static const u16 NCT6775_REG_FAN_MIN[] = { 0x3b, 0x3c, 0x3d };
static const u16 NCT6775_REG_FAN_PULSES[] = { 0x641, 0x642, 0x643, 0x644, 0 };
static const u16 NCT6775_FAN_PULSE_SHIFT[] = { 0, 0, 0, 0, 0, 0 };

static const u16 NCT6775_REG_TEMP[] = {
        0x27, 0x150, 0x250, 0x62b, 0x62c, 0x62d };

static const u16 NCT6775_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
        0, 0x152, 0x252, 0x628, 0x629, 0x62A };
static const u16 NCT6775_REG_TEMP_HYST[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
        0x3a, 0x153, 0x253, 0x673, 0x678, 0x67D };
static const u16 NCT6775_REG_TEMP_OVER[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
        0x39, 0x155, 0x255, 0x672, 0x677, 0x67C };

static const u16 NCT6775_REG_TEMP_SOURCE[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
        0x621, 0x622, 0x623, 0x624, 0x625, 0x626 };

static const u16 NCT6775_REG_TEMP_SEL[] = {
        0x100, 0x200, 0x300, 0x800, 0x900, 0xa00 };

static const u16 NCT6775_REG_WEIGHT_TEMP_SEL[] = {
        0x139, 0x239, 0x339, 0x839, 0x939, 0xa39 };
static const u16 NCT6775_REG_WEIGHT_TEMP_STEP[] = {
        0x13a, 0x23a, 0x33a, 0x83a, 0x93a, 0xa3a };
static const u16 NCT6775_REG_WEIGHT_TEMP_STEP_TOL[] = {
        0x13b, 0x23b, 0x33b, 0x83b, 0x93b, 0xa3b };
static const u16 NCT6775_REG_WEIGHT_DUTY_STEP[] = {
        0x13c, 0x23c, 0x33c, 0x83c, 0x93c, 0xa3c };
static const u16 NCT6775_REG_WEIGHT_TEMP_BASE[] = {
        0x13d, 0x23d, 0x33d, 0x83d, 0x93d, 0xa3d };

static const u16 NCT6775_REG_TEMP_OFFSET[] = { 0x454, 0x455, 0x456 };

static const u16 NCT6775_REG_AUTO_TEMP[] = {
        0x121, 0x221, 0x321, 0x821, 0x921, 0xa21 };
static const u16 NCT6775_REG_AUTO_PWM[] = {
        0x127, 0x227, 0x327, 0x827, 0x927, 0xa27 };

#define NCT6775_AUTO_TEMP(data, nr, p)  ((data)->REG_AUTO_TEMP[nr] + (p))
#define NCT6775_AUTO_PWM(data, nr, p)   ((data)->REG_AUTO_PWM[nr] + (p))

static const u16 NCT6775_REG_CRITICAL_ENAB[] = { 0x134, 0x234, 0x334 };

static const u16 NCT6775_REG_CRITICAL_TEMP[] = {
        0x135, 0x235, 0x335, 0x835, 0x935, 0xa35 };
static const u16 NCT6775_REG_CRITICAL_TEMP_TOLERANCE[] = {
        0x138, 0x238, 0x338, 0x838, 0x938, 0xa38 };

static const char *const nct6775_temp_label[] = {
        "",
        "SYSTIN",
        "CPUTIN",
        "AUXTIN",
        "AMD SB-TSI",
        "PECI Agent 0",
        "PECI Agent 1",
        "PECI Agent 2",
        "PECI Agent 3",
        "PECI Agent 4",
        "PECI Agent 5",
        "PECI Agent 6",
        "PECI Agent 7",
        "PCH_CHIP_CPU_MAX_TEMP",
        "PCH_CHIP_TEMP",
        "PCH_CPU_TEMP",
        "PCH_MCH_TEMP",
        "PCH_DIM0_TEMP",
        "PCH_DIM1_TEMP",
        "PCH_DIM2_TEMP",
        "PCH_DIM3_TEMP"
};

static const u16 NCT6775_REG_TEMP_ALTERNATE[ARRAY_SIZE(nct6775_temp_label) - 1]
        = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x661, 0x662, 0x664 };

static const u16 NCT6775_REG_TEMP_CRIT[ARRAY_SIZE(nct6775_temp_label) - 1]
        = { 0, 0, 0, 0, 0xa00, 0xa01, 0xa02, 0xa03, 0xa04, 0xa05, 0xa06,
            0xa07 };

/* NCT6776 specific data */

static const s8 NCT6776_ALARM_BITS[] = {
        0, 1, 2, 3, 8, 21, 20, 16,      /* in0.. in7 */
        17, -1, -1, -1, -1, -1, -1,     /* in8..in14 */
        -1,                             /* unused */
        6, 7, 11, 10, 23,               /* fan1..fan5 */
        -1, -1, -1,                     /* unused */
        4, 5, 13, -1, -1, -1,           /* temp1..temp6 */
        12, 9 };                        /* intrusion0, intrusion1 */

static const u16 NCT6776_REG_BEEP[NUM_REG_BEEP] = { 0xb2, 0xb3, 0xb4, 0xb5 };

static const s8 NCT6776_BEEP_BITS[] = {
        0, 1, 2, 3, 4, 5, 6, 7,         /* in0.. in7 */
        8, -1, -1, -1, -1, -1, -1,      /* in8..in14 */
        24,                             /* global beep enable */
        25, 26, 27, 28, 29,             /* fan1..fan5 */
        -1, -1, -1,                     /* unused */
        16, 17, 18, 19, 20, 21,         /* temp1..temp6 */
        30, 31 };                       /* intrusion0, intrusion1 */

static const u16 NCT6776_REG_TOLERANCE_H[] = {
        0x10c, 0x20c, 0x30c, 0x80c, 0x90c, 0xa0c };

static const u8 NCT6776_REG_PWM_MODE[] = { 0x04, 0, 0, 0, 0, 0 };
static const u8 NCT6776_PWM_MODE_MASK[] = { 0x01, 0, 0, 0, 0, 0 };

static const u16 NCT6776_REG_FAN_MIN[] = { 0x63a, 0x63c, 0x63e, 0x640, 0x642 };
static const u16 NCT6776_REG_FAN_PULSES[] = { 0x644, 0x645, 0x646, 0, 0 };

static const u16 NCT6776_REG_WEIGHT_DUTY_BASE[] = {
        0x13e, 0x23e, 0x33e, 0x83e, 0x93e, 0xa3e };

static const u16 NCT6776_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
        0x18, 0x152, 0x252, 0x628, 0x629, 0x62A };

static const char *const nct6776_temp_label[] = {
        "",
        "SYSTIN",
        "CPUTIN",
        "AUXTIN",
        "SMBUSMASTER 0",
        "SMBUSMASTER 1",
        "SMBUSMASTER 2",
        "SMBUSMASTER 3",
        "SMBUSMASTER 4",
        "SMBUSMASTER 5",
        "SMBUSMASTER 6",
        "SMBUSMASTER 7",
        "PECI Agent 0",
        "PECI Agent 1",
        "PCH_CHIP_CPU_MAX_TEMP",
        "PCH_CHIP_TEMP",
        "PCH_CPU_TEMP",
        "PCH_MCH_TEMP",
        "PCH_DIM0_TEMP",
        "PCH_DIM1_TEMP",
        "PCH_DIM2_TEMP",
        "PCH_DIM3_TEMP",
        "BYTE_TEMP"
};

static const u16 NCT6776_REG_TEMP_ALTERNATE[ARRAY_SIZE(nct6776_temp_label) - 1]
        = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x401, 0x402, 0x404 };

static const u16 NCT6776_REG_TEMP_CRIT[ARRAY_SIZE(nct6776_temp_label) - 1]
        = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x709, 0x70a };

/* NCT6779 specific data */

static const u16 NCT6779_REG_IN[] = {
        0x480, 0x481, 0x482, 0x483, 0x484, 0x485, 0x486, 0x487,
        0x488, 0x489, 0x48a, 0x48b, 0x48c, 0x48d, 0x48e };

static const u16 NCT6779_REG_ALARM[NUM_REG_ALARM] = {
        0x459, 0x45A, 0x45B, 0x568 };

static const s8 NCT6779_ALARM_BITS[] = {
        0, 1, 2, 3, 8, 21, 20, 16,      /* in0.. in7 */
        17, 24, 25, 26, 27, 28, 29,     /* in8..in14 */
        -1,                             /* unused */
        6, 7, 11, 10, 23,               /* fan1..fan5 */
        -1, -1, -1,                     /* unused */
        4, 5, 13, -1, -1, -1,           /* temp1..temp6 */
        12, 9 };                        /* intrusion0, intrusion1 */

static const s8 NCT6779_BEEP_BITS[] = {
        0, 1, 2, 3, 4, 5, 6, 7,         /* in0.. in7 */
        8, 9, 10, 11, 12, 13, 14,       /* in8..in14 */
        24,                             /* global beep enable */
        25, 26, 27, 28, 29,             /* fan1..fan5 */
        -1, -1, -1,                     /* unused */
        16, 17, -1, -1, -1, -1,         /* temp1..temp6 */
        30, 31 };                       /* intrusion0, intrusion1 */

static const u16 NCT6779_REG_FAN[] = {
        0x4b0, 0x4b2, 0x4b4, 0x4b6, 0x4b8, 0x4ba };
static const u16 NCT6779_REG_FAN_PULSES[] = {
        0x644, 0x645, 0x646, 0x647, 0x648, 0x649 };

static const u16 NCT6779_REG_CRITICAL_PWM_ENABLE[] = {
        0x136, 0x236, 0x336, 0x836, 0x936, 0xa36 };
#define NCT6779_CRITICAL_PWM_ENABLE_MASK        0x01
static const u16 NCT6779_REG_CRITICAL_PWM[] = {
        0x137, 0x237, 0x337, 0x837, 0x937, 0xa37 };

static const u16 NCT6779_REG_TEMP[] = { 0x27, 0x150 };
static const u16 NCT6779_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
        0x18, 0x152 };
static const u16 NCT6779_REG_TEMP_HYST[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
        0x3a, 0x153 };
static const u16 NCT6779_REG_TEMP_OVER[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
        0x39, 0x155 };

static const u16 NCT6779_REG_TEMP_OFFSET[] = {
        0x454, 0x455, 0x456, 0x44a, 0x44b, 0x44c };

static const char *const nct6779_temp_label[] = {
        "",
        "SYSTIN",
        "CPUTIN",
        "AUXTIN0",
        "AUXTIN1",
        "AUXTIN2",
        "AUXTIN3",
        "",
        "SMBUSMASTER 0",
        "SMBUSMASTER 1",
        "SMBUSMASTER 2",
        "SMBUSMASTER 3",
        "SMBUSMASTER 4",
        "SMBUSMASTER 5",
        "SMBUSMASTER 6",
        "SMBUSMASTER 7",
        "PECI Agent 0",
        "PECI Agent 1",
        "PCH_CHIP_CPU_MAX_TEMP",
        "PCH_CHIP_TEMP",
        "PCH_CPU_TEMP",
        "PCH_MCH_TEMP",
        "PCH_DIM0_TEMP",
        "PCH_DIM1_TEMP",
        "PCH_DIM2_TEMP",
        "PCH_DIM3_TEMP",
        "BYTE_TEMP"
};

static const u16 NCT6779_REG_TEMP_ALTERNATE[ARRAY_SIZE(nct6779_temp_label) - 1]
        = { 0x490, 0x491, 0x492, 0x493, 0x494, 0x495, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0,
            0, 0x400, 0x401, 0x402, 0x404, 0x405, 0x406, 0x407,
            0x408, 0 };

static const u16 NCT6779_REG_TEMP_CRIT[ARRAY_SIZE(nct6779_temp_label) - 1]
        = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x709, 0x70a };

/* NCT6791 specific data */

#define NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE     0x28

static const u16 NCT6791_REG_ALARM[NUM_REG_ALARM] = {
        0x459, 0x45A, 0x45B, 0x568, 0x45D };

static const s8 NCT6791_ALARM_BITS[] = {
        0, 1, 2, 3, 8, 21, 20, 16,      /* in0.. in7 */
        17, 24, 25, 26, 27, 28, 29,     /* in8..in14 */
        -1,                             /* unused */
        6, 7, 11, 10, 23, 33,           /* fan1..fan6 */
        -1, -1,                         /* unused */
        4, 5, 13, -1, -1, -1,           /* temp1..temp6 */
        12, 9 };                        /* intrusion0, intrusion1 */


/* NCT6102D/NCT6106D specific data */

#define NCT6106_REG_VBAT        0x318
#define NCT6106_REG_DIODE       0x319
#define NCT6106_DIODE_MASK      0x01

static const u16 NCT6106_REG_IN_MAX[] = {
        0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9e, 0xa0, 0xa2 };
static const u16 NCT6106_REG_IN_MIN[] = {
        0x91, 0x93, 0x95, 0x97, 0x99, 0x9b, 0x9f, 0xa1, 0xa3 };
static const u16 NCT6106_REG_IN[] = {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x07, 0x08, 0x09 };

static const u16 NCT6106_REG_TEMP[] = { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15 };
static const u16 NCT6106_REG_TEMP_HYST[] = {
        0xc3, 0xc7, 0xcb, 0xcf, 0xd3, 0xd7 };
static const u16 NCT6106_REG_TEMP_OVER[] = {
        0xc2, 0xc6, 0xca, 0xce, 0xd2, 0xd6 };
static const u16 NCT6106_REG_TEMP_CRIT_L[] = {
        0xc0, 0xc4, 0xc8, 0xcc, 0xd0, 0xd4 };
static const u16 NCT6106_REG_TEMP_CRIT_H[] = {
        0xc1, 0xc5, 0xc9, 0xcf, 0xd1, 0xd5 };
static const u16 NCT6106_REG_TEMP_OFFSET[] = { 0x311, 0x312, 0x313 };
static const u16 NCT6106_REG_TEMP_CONFIG[] = {
        0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc };

static const u16 NCT6106_REG_FAN[] = { 0x20, 0x22, 0x24 };
static const u16 NCT6106_REG_FAN_MIN[] = { 0xe0, 0xe2, 0xe4 };
static const u16 NCT6106_REG_FAN_PULSES[] = { 0xf6, 0xf6, 0xf6, 0, 0 };
static const u16 NCT6106_FAN_PULSE_SHIFT[] = { 0, 2, 4, 0, 0 };

static const u8 NCT6106_REG_PWM_MODE[] = { 0xf3, 0xf3, 0xf3 };
static const u8 NCT6106_PWM_MODE_MASK[] = { 0x01, 0x02, 0x04 };
static const u16 NCT6106_REG_PWM[] = { 0x119, 0x129, 0x139 };
static const u16 NCT6106_REG_PWM_READ[] = { 0x4a, 0x4b, 0x4c };
static const u16 NCT6106_REG_FAN_MODE[] = { 0x113, 0x123, 0x133 };
static const u16 NCT6106_REG_TEMP_SEL[] = { 0x110, 0x120, 0x130 };
static const u16 NCT6106_REG_TEMP_SOURCE[] = {
        0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5 };

static const u16 NCT6106_REG_CRITICAL_TEMP[] = { 0x11a, 0x12a, 0x13a };
static const u16 NCT6106_REG_CRITICAL_TEMP_TOLERANCE[] = {
        0x11b, 0x12b, 0x13b };

static const u16 NCT6106_REG_CRITICAL_PWM_ENABLE[] = { 0x11c, 0x12c, 0x13c };
#define NCT6106_CRITICAL_PWM_ENABLE_MASK        0x10
static const u16 NCT6106_REG_CRITICAL_PWM[] = { 0x11d, 0x12d, 0x13d };

static const u16 NCT6106_REG_FAN_STEP_UP_TIME[] = { 0x114, 0x124, 0x134 };
static const u16 NCT6106_REG_FAN_STEP_DOWN_TIME[] = { 0x115, 0x125, 0x135 };
static const u16 NCT6106_REG_FAN_STOP_OUTPUT[] = { 0x116, 0x126, 0x136 };
static const u16 NCT6106_REG_FAN_START_OUTPUT[] = { 0x117, 0x127, 0x137 };
static const u16 NCT6106_REG_FAN_STOP_TIME[] = { 0x118, 0x128, 0x138 };
static const u16 NCT6106_REG_TOLERANCE_H[] = { 0x112, 0x122, 0x132 };

static const u16 NCT6106_REG_TARGET[] = { 0x111, 0x121, 0x131 };

static const u16 NCT6106_REG_WEIGHT_TEMP_SEL[] = { 0x168, 0x178, 0x188 };
static const u16 NCT6106_REG_WEIGHT_TEMP_STEP[] = { 0x169, 0x179, 0x189 };
static const u16 NCT6106_REG_WEIGHT_TEMP_STEP_TOL[] = { 0x16a, 0x17a, 0x18a };
static const u16 NCT6106_REG_WEIGHT_DUTY_STEP[] = { 0x16b, 0x17b, 0x17c };
static const u16 NCT6106_REG_WEIGHT_TEMP_BASE[] = { 0x16c, 0x17c, 0x18c };
static const u16 NCT6106_REG_WEIGHT_DUTY_BASE[] = { 0x16d, 0x17d, 0x18d };

static const u16 NCT6106_REG_AUTO_TEMP[] = { 0x160, 0x170, 0x180 };
static const u16 NCT6106_REG_AUTO_PWM[] = { 0x164, 0x174, 0x184 };

static const u16 NCT6106_REG_ALARM[NUM_REG_ALARM] = {
        0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d };

static const s8 NCT6106_ALARM_BITS[] = {
        0, 1, 2, 3, 4, 5, 7, 8,         /* in0.. in7 */
        9, -1, -1, -1, -1, -1, -1,      /* in8..in14 */
        -1,                             /* unused */
        32, 33, 34, -1, -1,             /* fan1..fan5 */
        -1, -1, -1,                     /* unused */
        16, 17, 18, 19, 20, 21,         /* temp1..temp6 */
        48, -1                          /* intrusion0, intrusion1 */
};

static const u16 NCT6106_REG_BEEP[NUM_REG_BEEP] = {
        0x3c0, 0x3c1, 0x3c2, 0x3c3, 0x3c4 };

static const s8 NCT6106_BEEP_BITS[] = {
        0, 1, 2, 3, 4, 5, 7, 8,         /* in0.. in7 */
        9, 10, 11, 12, -1, -1, -1,      /* in8..in14 */
        32,                             /* global beep enable */
        24, 25, 26, 27, 28,             /* fan1..fan5 */
        -1, -1, -1,                     /* unused */
        16, 17, 18, 19, 20, 21,         /* temp1..temp6 */
        34, -1                          /* intrusion0, intrusion1 */
};

static const u16 NCT6106_REG_TEMP_ALTERNATE[ARRAY_SIZE(nct6776_temp_label) - 1]
        = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x51, 0x52, 0x54 };

static const u16 NCT6106_REG_TEMP_CRIT[ARRAY_SIZE(nct6776_temp_label) - 1]
        = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x204, 0x205 };

static enum pwm_enable reg_to_pwm_enable(int pwm, int mode)
{
        if (mode == 0 && pwm == 255)
                return off;
        return mode + 1;
}

static int pwm_enable_to_reg(enum pwm_enable mode)
{
        if (mode == off)
                return 0;
        return mode - 1;
}

/*
 * Conversions
 */

/* 1 is DC mode, output in ms */
static unsigned int step_time_from_reg(u8 reg, u8 mode)
{
        return mode ? 400 * reg : 100 * reg;
}

static u8 step_time_to_reg(unsigned int msec, u8 mode)
{
        return clamp_val((mode ? (msec + 200) / 400 :
                                        (msec + 50) / 100), 1, 255);
}

static unsigned int fan_from_reg8(u16 reg, unsigned int divreg)
{
        if (reg == 0 || reg == 255)
                return 0;
        return 1350000U / (reg << divreg);
}

static unsigned int fan_from_reg13(u16 reg, unsigned int divreg)
{
        if ((reg & 0xff1f) == 0xff1f)
                return 0;

        reg = (reg & 0x1f) | ((reg & 0xff00) >> 3);

        if (reg == 0)
                return 0;

        return 1350000U / reg;
}

static unsigned int fan_from_reg16(u16 reg, unsigned int divreg)
{
        if (reg == 0 || reg == 0xffff)
                return 0;

        /*
         * Even though the registers are 16 bit wide, the fan divisor
         * still applies.
         */
        return 1350000U / (reg << divreg);
}

static u16 fan_to_reg(u32 fan, unsigned int divreg)
{
        if (!fan)
                return 0;

        return (1350000U / fan) >> divreg;
}

static inline unsigned int
div_from_reg(u8 reg)
{
        return 1 << reg;
}

/*
 * Some of the voltage inputs have internal scaling, the tables below
 * contain 8 (the ADC LSB in mV) * scaling factor * 100
 */
static const u16 scale_in[15] = {
        800, 800, 1600, 1600, 800, 800, 800, 1600, 1600, 800, 800, 800, 800,
        800, 800
};

static inline long in_from_reg(u8 reg, u8 nr)
{
        return DIV_ROUND_CLOSEST(reg * scale_in[nr], 100);
}

static inline u8 in_to_reg(u32 val, u8 nr)
{
        return clamp_val(DIV_ROUND_CLOSEST(val * 100, scale_in[nr]), 0, 255);
}

/*
 * Data structures and manipulation thereof
 */

struct nct6775_data {
        int addr;       /* IO base of hw monitor block */
        int sioreg;     /* SIO register address */
        enum kinds kind;
        const char *name;

        struct device *hwmon_dev;
        struct attribute_group *group_in;
        struct attribute_group *group_fan;
        struct attribute_group *group_temp;
        struct attribute_group *group_pwm;

        u16 reg_temp[5][NUM_TEMP]; /* 0=temp, 1=temp_over, 2=temp_hyst,
                                    * 3=temp_crit, 4=temp_lcrit
                                    */
        u8 temp_src[NUM_TEMP];
        u16 reg_temp_config[NUM_TEMP];
        const char * const *temp_label;
        int temp_label_num;

        u16 REG_CONFIG;
        u16 REG_VBAT;
        u16 REG_DIODE;
        u8 DIODE_MASK;

        const s8 *ALARM_BITS;
        const s8 *BEEP_BITS;

        const u16 *REG_VIN;
        const u16 *REG_IN_MINMAX[2];

        const u16 *REG_TARGET;
        const u16 *REG_FAN;
        const u16 *REG_FAN_MODE;
        const u16 *REG_FAN_MIN;
        const u16 *REG_FAN_PULSES;
        const u16 *FAN_PULSE_SHIFT;
        const u16 *REG_FAN_TIME[3];

        const u16 *REG_TOLERANCE_H;

        const u8 *REG_PWM_MODE;
        const u8 *PWM_MODE_MASK;

        const u16 *REG_PWM[7];  /* [0]=pwm, [1]=pwm_start, [2]=pwm_floor,
                                 * [3]=pwm_max, [4]=pwm_step,
                                 * [5]=weight_duty_step, [6]=weight_duty_base
                                 */
        const u16 *REG_PWM_READ;

        const u16 *REG_CRITICAL_PWM_ENABLE;
        u8 CRITICAL_PWM_ENABLE_MASK;
        const u16 *REG_CRITICAL_PWM;

        const u16 *REG_AUTO_TEMP;
        const u16 *REG_AUTO_PWM;

        const u16 *REG_CRITICAL_TEMP;
        const u16 *REG_CRITICAL_TEMP_TOLERANCE;

        const u16 *REG_TEMP_SOURCE;     /* temp register sources */
        const u16 *REG_TEMP_SEL;
        const u16 *REG_WEIGHT_TEMP_SEL;
        const u16 *REG_WEIGHT_TEMP[3];  /* 0=base, 1=tolerance, 2=step */

        const u16 *REG_TEMP_OFFSET;

        const u16 *REG_ALARM;
        const u16 *REG_BEEP;

        unsigned int (*fan_from_reg)(u16 reg, unsigned int divreg);
        unsigned int (*fan_from_reg_min)(u16 reg, unsigned int divreg);

        struct mutex update_lock;
        bool valid;             /* true if following fields are valid */
        unsigned long last_updated;     /* In jiffies */

        /* Register values */
        u8 bank;                /* current register bank */
        u8 in_num;              /* number of in inputs we have */
        u8 in[15][3];           /* [0]=in, [1]=in_max, [2]=in_min */
        unsigned int rpm[NUM_FAN];
        u16 fan_min[NUM_FAN];
        u8 fan_pulses[NUM_FAN];
        u8 fan_div[NUM_FAN];
        u8 has_pwm;
        u8 has_fan;             /* some fan inputs can be disabled */
        u8 has_fan_min;         /* some fans don't have min register */
        bool has_fan_div;

        u8 num_temp_alarms;     /* 2, 3, or 6 */
        u8 num_temp_beeps;      /* 2, 3, or 6 */
        u8 temp_fixed_num;      /* 3 or 6 */
        u8 temp_type[NUM_TEMP_FIXED];
        s8 temp_offset[NUM_TEMP_FIXED];
        s16 temp[5][NUM_TEMP]; /* 0=temp, 1=temp_over, 2=temp_hyst,
                                * 3=temp_crit, 4=temp_lcrit */
        u64 alarms;
        u64 beeps;

        u8 pwm_num;     /* number of pwm */
        u8 pwm_mode[NUM_FAN];   /* 1->DC variable voltage,
                                 * 0->PWM variable duty cycle
                                 */
        enum pwm_enable pwm_enable[NUM_FAN];
                        /* 0->off
                         * 1->manual
                         * 2->thermal cruise mode (also called SmartFan I)
                         * 3->fan speed cruise mode
                         * 4->SmartFan III
                         * 5->enhanced variable thermal cruise (SmartFan IV)
                         */
        u8 pwm[7][NUM_FAN];     /* [0]=pwm, [1]=pwm_start, [2]=pwm_floor,
                                 * [3]=pwm_max, [4]=pwm_step,
                                 * [5]=weight_duty_step, [6]=weight_duty_base
                                 */

        u8 target_temp[NUM_FAN];
        u8 target_temp_mask;
        u32 target_speed[NUM_FAN];
        u32 target_speed_tolerance[NUM_FAN];
        u8 speed_tolerance_limit;

        u8 temp_tolerance[2][NUM_FAN];
        u8 tolerance_mask;

        u8 fan_time[3][NUM_FAN]; /* 0 = stop_time, 1 = step_up, 2 = step_down */

        /* Automatic fan speed control registers */
        int auto_pwm_num;
        u8 auto_pwm[NUM_FAN][7];
        u8 auto_temp[NUM_FAN][7];
        u8 pwm_temp_sel[NUM_FAN];
        u8 pwm_weight_temp_sel[NUM_FAN];
        u8 weight_temp[3][NUM_FAN];     /* 0->temp_step, 1->temp_step_tol,
                                         * 2->temp_base
                                         */

        u8 vid;
        u8 vrm;

        bool have_vid;

        u16 have_temp;
        u16 have_temp_fixed;
        u16 have_in;
#ifdef CONFIG_PM
        /* Remember extra register values over suspend/resume */
        u8 vbat;
        u8 fandiv1;
        u8 fandiv2;
#endif
};

struct nct6775_sio_data {
        int sioreg;
        enum kinds kind;
};

struct sensor_device_template {
        struct device_attribute dev_attr;
        union {
                struct {
                        u8 nr;
                        u8 index;
                } s;
                int index;
        } u;
        bool s2;        /* true if both index and nr are used */
};

struct sensor_device_attr_u {
        union {
                struct sensor_device_attribute a1;
                struct sensor_device_attribute_2 a2;
        } u;
        char name[32];
};

#define __TEMPLATE_ATTR(_template, _mode, _show, _store) {      \
        .attr = {.name = _template, .mode = _mode },            \
        .show   = _show,                                        \
        .store  = _store,                                       \
}

#define SENSOR_DEVICE_TEMPLATE(_template, _mode, _show, _store, _index) \
        { .dev_attr = __TEMPLATE_ATTR(_template, _mode, _show, _store), \
          .u.index = _index,                                            \
          .s2 = false }

#define SENSOR_DEVICE_TEMPLATE_2(_template, _mode, _show, _store,       \
                                 _nr, _index)                           \
        { .dev_attr = __TEMPLATE_ATTR(_template, _mode, _show, _store), \
          .u.s.index = _index,                                          \
          .u.s.nr = _nr,                                                \
          .s2 = true }

#define SENSOR_TEMPLATE(_name, _template, _mode, _show, _store, _index) \
static struct sensor_device_template sensor_dev_template_##_name        \
        = SENSOR_DEVICE_TEMPLATE(_template, _mode, _show, _store,       \
                                 _index)

#define SENSOR_TEMPLATE_2(_name, _template, _mode, _show, _store,       \
                          _nr, _index)                                  \
static struct sensor_device_template sensor_dev_template_##_name        \
        = SENSOR_DEVICE_TEMPLATE_2(_template, _mode, _show, _store,     \
                                 _nr, _index)

struct sensor_template_group {
        struct sensor_device_template **templates;
        umode_t (*is_visible)(struct kobject *, struct attribute *, int);
        int base;
};

static struct attribute_group *
nct6775_create_attr_group(struct device *dev, struct sensor_template_group *tg,
                          int repeat)
{
        struct attribute_group *group;
        struct sensor_device_attr_u *su;
        struct sensor_device_attribute *a;
        struct sensor_device_attribute_2 *a2;
        struct attribute **attrs;
        struct sensor_device_template **t;
        int err, i, j, count;

        if (repeat <= 0)
                return ERR_PTR(-EINVAL);

        t = tg->templates;
        for (count = 0; *t; t++, count++)
                ;

        if (count == 0)
                return ERR_PTR(-EINVAL);

        group = devm_kzalloc(dev, sizeof(*group), GFP_KERNEL);
        if (group == NULL)
                return ERR_PTR(-ENOMEM);

        attrs = devm_kzalloc(dev, sizeof(*attrs) * (repeat * count + 1),
                             GFP_KERNEL);
        if (attrs == NULL)
                return ERR_PTR(-ENOMEM);

        su = devm_kzalloc(dev, sizeof(*su) * repeat * count,
                               GFP_KERNEL);
        if (su == NULL)
                return ERR_PTR(-ENOMEM);

        group->attrs = attrs;
        group->is_visible = tg->is_visible;

        for (i = 0; i < repeat; i++) {
                t = tg->templates;
                for (j = 0; *t != NULL; j++) {
                        snprintf(su->name, sizeof(su->name),
                                 (*t)->dev_attr.attr.name, tg->base + i);
                        if ((*t)->s2) {
                                a2 = &su->u.a2;
                                a2->dev_attr.attr.name = su->name;
                                a2->nr = (*t)->u.s.nr + i;
                                a2->index = (*t)->u.s.index;
                                a2->dev_attr.attr.mode =
                                  (*t)->dev_attr.attr.mode;
                                a2->dev_attr.show = (*t)->dev_attr.show;
                                a2->dev_attr.store = (*t)->dev_attr.store;
                                *attrs = &a2->dev_attr.attr;
                        } else {
                                a = &su->u.a1;
                                a->dev_attr.attr.name = su->name;
                                a->index = (*t)->u.index + i;
                                a->dev_attr.attr.mode =
                                  (*t)->dev_attr.attr.mode;
                                a->dev_attr.show = (*t)->dev_attr.show;
                                a->dev_attr.store = (*t)->dev_attr.store;
                                *attrs = &a->dev_attr.attr;
                        }
                        attrs++;
                        su++;

                        t++;
                }
        }

        err = sysfs_create_group(&dev->kobj, group);
        if (err)
                return ERR_PTR(-ENOMEM);

        return group;
}

static bool is_word_sized(struct nct6775_data *data, u16 reg)
{
        switch (data->kind) {
        case nct6106:
                return reg == 0x20 || reg == 0x22 || reg == 0x24 ||
                  reg == 0xe0 || reg == 0xe2 || reg == 0xe4 ||
                  reg == 0x111 || reg == 0x121 || reg == 0x131;
        case nct6775:
                return (((reg & 0xff00) == 0x100 ||
                    (reg & 0xff00) == 0x200) &&
                   ((reg & 0x00ff) == 0x50 ||
                    (reg & 0x00ff) == 0x53 ||
                    (reg & 0x00ff) == 0x55)) ||
                  (reg & 0xfff0) == 0x630 ||
                  reg == 0x640 || reg == 0x642 ||
                  reg == 0x662 ||
                  ((reg & 0xfff0) == 0x650 && (reg & 0x000f) >= 0x06) ||
                  reg == 0x73 || reg == 0x75 || reg == 0x77;
        case nct6776:
                return (((reg & 0xff00) == 0x100 ||
                    (reg & 0xff00) == 0x200) &&
                   ((reg & 0x00ff) == 0x50 ||
                    (reg & 0x00ff) == 0x53 ||
                    (reg & 0x00ff) == 0x55)) ||
                  (reg & 0xfff0) == 0x630 ||
                  reg == 0x402 ||
                  reg == 0x640 || reg == 0x642 ||
                  ((reg & 0xfff0) == 0x650 && (reg & 0x000f) >= 0x06) ||
                  reg == 0x73 || reg == 0x75 || reg == 0x77;
        case nct6779:
        case nct6791:
                return reg == 0x150 || reg == 0x153 || reg == 0x155 ||
                  ((reg & 0xfff0) == 0x4b0 && (reg & 0x000f) < 0x0b) ||
                  reg == 0x402 ||
                  reg == 0x63a || reg == 0x63c || reg == 0x63e ||
                  reg == 0x640 || reg == 0x642 ||
                  reg == 0x73 || reg == 0x75 || reg == 0x77 || reg == 0x79 ||
                  reg == 0x7b;
        }
        return false;
}

/*
 * On older chips, only registers 0x50-0x5f are banked.
 * On more recent chips, all registers are banked.
 * Assume that is the case and set the bank number for each access.
 * Cache the bank number so it only needs to be set if it changes.
 */
static inline void nct6775_set_bank(struct nct6775_data *data, u16 reg)
{
        u8 bank = reg >> 8;
        if (data->bank != bank) {
                outb_p(NCT6775_REG_BANK, data->addr + ADDR_REG_OFFSET);
                outb_p(bank, data->addr + DATA_REG_OFFSET);
                data->bank = bank;
        }
}

static u16 nct6775_read_value(struct nct6775_data *data, u16 reg)
{
        int res, word_sized = is_word_sized(data, reg);

        nct6775_set_bank(data, reg);
        outb_p(reg & 0xff, data->addr + ADDR_REG_OFFSET);
        res = inb_p(data->addr + DATA_REG_OFFSET);
        if (word_sized) {
                outb_p((reg & 0xff) + 1,
                       data->addr + ADDR_REG_OFFSET);
                res = (res << 8) + inb_p(data->addr + DATA_REG_OFFSET);
        }
        return res;
}

static int nct6775_write_value(struct nct6775_data *data, u16 reg, u16 value)
{
        int word_sized = is_word_sized(data, reg);

        nct6775_set_bank(data, reg);
        outb_p(reg & 0xff, data->addr + ADDR_REG_OFFSET);
        if (word_sized) {
                outb_p(value >> 8, data->addr + DATA_REG_OFFSET);
                outb_p((reg & 0xff) + 1,
                       data->addr + ADDR_REG_OFFSET);
        }
        outb_p(value & 0xff, data->addr + DATA_REG_OFFSET);
        return 0;
}

/* We left-align 8-bit temperature values to make the code simpler */
static u16 nct6775_read_temp(struct nct6775_data *data, u16 reg)
{
        u16 res;

        res = nct6775_read_value(data, reg);
        if (!is_word_sized(data, reg))
                res <<= 8;

        return res;
}

static int nct6775_write_temp(struct nct6775_data *data, u16 reg, u16 value)
{
        if (!is_word_sized(data, reg))
                value >>= 8;
        return nct6775_write_value(data, reg, value);
}

/* This function assumes that the caller holds data->update_lock */
static void nct6775_write_fan_div(struct nct6775_data *data, int nr)
{
        u8 reg;

        switch (nr) {
        case 0:
                reg = (nct6775_read_value(data, NCT6775_REG_FANDIV1) & 0x70)
                    | (data->fan_div[0] & 0x7);
                nct6775_write_value(data, NCT6775_REG_FANDIV1, reg);
                break;
        case 1:
                reg = (nct6775_read_value(data, NCT6775_REG_FANDIV1) & 0x7)
                    | ((data->fan_div[1] << 4) & 0x70);
                nct6775_write_value(data, NCT6775_REG_FANDIV1, reg);
                break;
        case 2:
                reg = (nct6775_read_value(data, NCT6775_REG_FANDIV2) & 0x70)
                    | (data->fan_div[2] & 0x7);
                nct6775_write_value(data, NCT6775_REG_FANDIV2, reg);
                break;
        case 3:
                reg = (nct6775_read_value(data, NCT6775_REG_FANDIV2) & 0x7)
                    | ((data->fan_div[3] << 4) & 0x70);
                nct6775_write_value(data, NCT6775_REG_FANDIV2, reg);
                break;
        }
}

static void nct6775_write_fan_div_common(struct nct6775_data *data, int nr)
{
        if (data->kind == nct6775)
                nct6775_write_fan_div(data, nr);
}

static void nct6775_update_fan_div(struct nct6775_data *data)
{
        u8 i;

        i = nct6775_read_value(data, NCT6775_REG_FANDIV1);
        data->fan_div[0] = i & 0x7;
        data->fan_div[1] = (i & 0x70) >> 4;
        i = nct6775_read_value(data, NCT6775_REG_FANDIV2);
        data->fan_div[2] = i & 0x7;
        if (data->has_fan & (1 << 3))
                data->fan_div[3] = (i & 0x70) >> 4;
}

static void nct6775_update_fan_div_common(struct nct6775_data *data)
{
        if (data->kind == nct6775)
                nct6775_update_fan_div(data);
}

static void nct6775_init_fan_div(struct nct6775_data *data)
{
        int i;

        nct6775_update_fan_div_common(data);
        /*
         * For all fans, start with highest divider value if the divider
         * register is not initialized. This ensures that we get a
         * reading from the fan count register, even if it is not optimal.
         * We'll compute a better divider later on.
         */
        for (i = 0; i < ARRAY_SIZE(data->fan_div); i++) {
                if (!(data->has_fan & (1 << i)))
                        continue;
                if (data->fan_div[i] == 0) {
                        data->fan_div[i] = 7;
                        nct6775_write_fan_div_common(data, i);
                }
        }
}

static void nct6775_init_fan_common(struct device *dev,
                                    struct nct6775_data *data)
{
        int i;
        u8 reg;

        if (data->has_fan_div)
                nct6775_init_fan_div(data);

        /*
         * If fan_min is not set (0), set it to 0xff to disable it. This
         * prevents the unnecessary warning when fanX_min is reported as 0.
         */
        for (i = 0; i < ARRAY_SIZE(data->fan_min); i++) {
                if (data->has_fan_min & (1 << i)) {
                        reg = nct6775_read_value(data, data->REG_FAN_MIN[i]);
                        if (!reg)
                                nct6775_write_value(data, data->REG_FAN_MIN[i],
                                                    data->has_fan_div ? 0xff
                                                                      : 0xff1f);
                }
        }
}

static void nct6775_select_fan_div(struct device *dev,
                                   struct nct6775_data *data, int nr, u16 reg)
{
        u8 fan_div = data->fan_div[nr];
        u16 fan_min;

        if (!data->has_fan_div)
                return;

        /*
         * If we failed to measure the fan speed, or the reported value is not
         * in the optimal range, and the clock divider can be modified,
         * let's try that for next time.
         */
        if (reg == 0x00 && fan_div < 0x07)
                fan_div++;
        else if (reg != 0x00 && reg < 0x30 && fan_div > 0)
                fan_div--;

        if (fan_div != data->fan_div[nr]) {
                dev_dbg(dev, "Modifying fan%d clock divider from %u to %u\n",
                        nr + 1, div_from_reg(data->fan_div[nr]),
                        div_from_reg(fan_div));

                /* Preserve min limit if possible */
                if (data->has_fan_min & (1 << nr)) {
                        fan_min = data->fan_min[nr];
                        if (fan_div > data->fan_div[nr]) {
                                if (fan_min != 255 && fan_min > 1)
                                        fan_min >>= 1;
                        } else {
                                if (fan_min != 255) {
                                        fan_min <<= 1;
                                        if (fan_min > 254)
                                                fan_min = 254;
                                }
                        }
                        if (fan_min != data->fan_min[nr]) {
                                data->fan_min[nr] = fan_min;
                                nct6775_write_value(data, data->REG_FAN_MIN[nr],
                                                    fan_min);
                        }
                }
                data->fan_div[nr] = fan_div;
                nct6775_write_fan_div_common(data, nr);
        }
}

static void nct6775_update_pwm(struct device *dev)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        int i, j;
        int fanmodecfg, reg;
        bool duty_is_dc;

        for (i = 0; i < data->pwm_num; i++) {
                if (!(data->has_pwm & (1 << i)))
                        continue;

                duty_is_dc = data->REG_PWM_MODE[i] &&
                  (nct6775_read_value(data, data->REG_PWM_MODE[i])
                   & data->PWM_MODE_MASK[i]);
                data->pwm_mode[i] = duty_is_dc;

                fanmodecfg = nct6775_read_value(data, data->REG_FAN_MODE[i]);
                for (j = 0; j < ARRAY_SIZE(data->REG_PWM); j++) {
                        if (data->REG_PWM[j] && data->REG_PWM[j][i]) {
                                data->pwm[j][i]
                                  = nct6775_read_value(data,
                                                       data->REG_PWM[j][i]);
                        }
                }

                data->pwm_enable[i] = reg_to_pwm_enable(data->pwm[0][i],
                                                        (fanmodecfg >> 4) & 7);

                if (!data->temp_tolerance[0][i] ||
                    data->pwm_enable[i] != speed_cruise)
                        data->temp_tolerance[0][i] = fanmodecfg & 0x0f;
                if (!data->target_speed_tolerance[i] ||
                    data->pwm_enable[i] == speed_cruise) {
                        u8 t = fanmodecfg & 0x0f;
                        if (data->REG_TOLERANCE_H) {
                                t |= (nct6775_read_value(data,
                                      data->REG_TOLERANCE_H[i]) & 0x70) >> 1;
                        }
                        data->target_speed_tolerance[i] = t;
                }

                data->temp_tolerance[1][i] =
                        nct6775_read_value(data,
                                        data->REG_CRITICAL_TEMP_TOLERANCE[i]);

                reg = nct6775_read_value(data, data->REG_TEMP_SEL[i]);
                data->pwm_temp_sel[i] = reg & 0x1f;
                /* If fan can stop, report floor as 0 */
                if (reg & 0x80)
                        data->pwm[2][i] = 0;

                reg = nct6775_read_value(data, data->REG_WEIGHT_TEMP_SEL[i]);
                data->pwm_weight_temp_sel[i] = reg & 0x1f;
                /* If weight is disabled, report weight source as 0 */
                if (j == 1 && !(reg & 0x80))
                        data->pwm_weight_temp_sel[i] = 0;

                /* Weight temp data */
                for (j = 0; j < ARRAY_SIZE(data->weight_temp); j++) {
                        data->weight_temp[j][i]
                          = nct6775_read_value(data,
                                               data->REG_WEIGHT_TEMP[j][i]);
                }
        }
}

static void nct6775_update_pwm_limits(struct device *dev)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        int i, j;
        u8 reg;
        u16 reg_t;

        for (i = 0; i < data->pwm_num; i++) {
                if (!(data->has_pwm & (1 << i)))
                        continue;

                for (j = 0; j < ARRAY_SIZE(data->fan_time); j++) {
                        data->fan_time[j][i] =
                          nct6775_read_value(data, data->REG_FAN_TIME[j][i]);
                }

                reg_t = nct6775_read_value(data, data->REG_TARGET[i]);
                /* Update only in matching mode or if never updated */
                if (!data->target_temp[i] ||
                    data->pwm_enable[i] == thermal_cruise)
                        data->target_temp[i] = reg_t & data->target_temp_mask;
                if (!data->target_speed[i] ||
                    data->pwm_enable[i] == speed_cruise) {
                        if (data->REG_TOLERANCE_H) {
                                reg_t |= (nct6775_read_value(data,
                                        data->REG_TOLERANCE_H[i]) & 0x0f) << 8;
                        }
                        data->target_speed[i] = reg_t;
                }

                for (j = 0; j < data->auto_pwm_num; j++) {
                        data->auto_pwm[i][j] =
                          nct6775_read_value(data,
                                             NCT6775_AUTO_PWM(data, i, j));
                        data->auto_temp[i][j] =
                          nct6775_read_value(data,
                                             NCT6775_AUTO_TEMP(data, i, j));
                }

                /* critical auto_pwm temperature data */
                data->auto_temp[i][data->auto_pwm_num] =
                        nct6775_read_value(data, data->REG_CRITICAL_TEMP[i]);

                switch (data->kind) {
                case nct6775:
                        reg = nct6775_read_value(data,
                                                 NCT6775_REG_CRITICAL_ENAB[i]);
                        data->auto_pwm[i][data->auto_pwm_num] =
                                                (reg & 0x02) ? 0xff : 0x00;
                        break;
                case nct6776:
                        data->auto_pwm[i][data->auto_pwm_num] = 0xff;
                        break;
                case nct6106:
                case nct6779:
                case nct6791:
                        reg = nct6775_read_value(data,
                                        data->REG_CRITICAL_PWM_ENABLE[i]);
                        if (reg & data->CRITICAL_PWM_ENABLE_MASK)
                                reg = nct6775_read_value(data,
                                        data->REG_CRITICAL_PWM[i]);
                        else
                                reg = 0xff;
                        data->auto_pwm[i][data->auto_pwm_num] = reg;
                        break;
                }
        }
}

static struct nct6775_data *nct6775_update_device(struct device *dev)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        int i, j;

        mutex_lock(&data->update_lock);

        if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
            || !data->valid) {
                /* Fan clock dividers */
                nct6775_update_fan_div_common(data);

                /* Measured voltages and limits */
                for (i = 0; i < data->in_num; i++) {
                        if (!(data->have_in & (1 << i)))
                                continue;

                        data->in[i][0] = nct6775_read_value(data,
                                                            data->REG_VIN[i]);
                        data->in[i][1] = nct6775_read_value(data,
                                          data->REG_IN_MINMAX[0][i]);
                        data->in[i][2] = nct6775_read_value(data,
                                          data->REG_IN_MINMAX[1][i]);
                }

                /* Measured fan speeds and limits */
                for (i = 0; i < ARRAY_SIZE(data->rpm); i++) {
                        u16 reg;

                        if (!(data->has_fan & (1 << i)))
                                continue;

                        reg = nct6775_read_value(data, data->REG_FAN[i]);
                        data->rpm[i] = data->fan_from_reg(reg,
                                                          data->fan_div[i]);

                        if (data->has_fan_min & (1 << i))
                                data->fan_min[i] = nct6775_read_value(data,
                                           data->REG_FAN_MIN[i]);
                        data->fan_pulses[i] =
                          (nct6775_read_value(data, data->REG_FAN_PULSES[i])
                                >> data->FAN_PULSE_SHIFT[i]) & 0x03;

                        nct6775_select_fan_div(dev, data, i, reg);
                }

                nct6775_update_pwm(dev);
                nct6775_update_pwm_limits(dev);

                /* Measured temperatures and limits */
                for (i = 0; i < NUM_TEMP; i++) {
                        if (!(data->have_temp & (1 << i)))
                                continue;
                        for (j = 0; j < ARRAY_SIZE(data->reg_temp); j++) {
                                if (data->reg_temp[j][i])
                                        data->temp[j][i]
                                          = nct6775_read_temp(data,
                                                data->reg_temp[j][i]);
                        }
                        if (!(data->have_temp_fixed & (1 << i)))
                                continue;
                        data->temp_offset[i]
                          = nct6775_read_value(data, data->REG_TEMP_OFFSET[i]);
                }

                data->alarms = 0;
                for (i = 0; i < NUM_REG_ALARM; i++) {
                        u8 alarm;
                        if (!data->REG_ALARM[i])
                                continue;
                        alarm = nct6775_read_value(data, data->REG_ALARM[i]);
                        data->alarms |= ((u64)alarm) << (i << 3);
                }

                data->beeps = 0;
                for (i = 0; i < NUM_REG_BEEP; i++) {
                        u8 beep;
                        if (!data->REG_BEEP[i])
                                continue;
                        beep = nct6775_read_value(data, data->REG_BEEP[i]);
                        data->beeps |= ((u64)beep) << (i << 3);
                }

                data->last_updated = jiffies;
                data->valid = true;
        }

        mutex_unlock(&data->update_lock);
        return data;
}

/*
 * Sysfs callback functions
 */
static ssize_t
show_in_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        return sprintf(buf, "%ld\n", in_from_reg(data->in[nr][index], nr));
}

static ssize_t
store_in_reg(struct device *dev, struct device_attribute *attr, const char *buf,
             size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        unsigned long val;
        int err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;
        mutex_lock(&data->update_lock);
        data->in[nr][index] = in_to_reg(val, nr);
        nct6775_write_value(data, data->REG_IN_MINMAX[index - 1][nr],
                            data->in[nr][index]);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = data->ALARM_BITS[sattr->index];
        return sprintf(buf, "%u\n",
                       (unsigned int)((data->alarms >> nr) & 0x01));
}

static int find_temp_source(struct nct6775_data *data, int index, int count)
{
        int source = data->temp_src[index];
        int nr;

        for (nr = 0; nr < count; nr++) {
                int src;

                src = nct6775_read_value(data,
                                         data->REG_TEMP_SOURCE[nr]) & 0x1f;
                if (src == source)
                        return nr;
        }
        return -1;
}

static ssize_t
show_temp_alarm(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        struct nct6775_data *data = nct6775_update_device(dev);
        unsigned int alarm = 0;
        int nr;

        /*
         * For temperatures, there is no fixed mapping from registers to alarm
         * bits. Alarm bits are determined by the temperature source mapping.
         */
        nr = find_temp_source(data, sattr->index, data->num_temp_alarms);
        if (nr >= 0) {
                int bit = data->ALARM_BITS[nr + TEMP_ALARM_BASE];
                alarm = (data->alarms >> bit) & 0x01;
        }
        return sprintf(buf, "%u\n", alarm);
}

static ssize_t
show_beep(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        struct nct6775_data *data = nct6775_update_device(dev);
        int nr = data->BEEP_BITS[sattr->index];

        return sprintf(buf, "%u\n",
                       (unsigned int)((data->beeps >> nr) & 0x01));
}

static ssize_t
store_beep(struct device *dev, struct device_attribute *attr, const char *buf,
           size_t count)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct nct6775_data *data = dev_get_drvdata(dev);
        int nr = data->BEEP_BITS[sattr->index];
        int regindex = nr >> 3;
        unsigned long val;

        int err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;
        if (val > 1)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        if (val)
                data->beeps |= (1ULL << nr);
        else
                data->beeps &= ~(1ULL << nr);
        nct6775_write_value(data, data->REG_BEEP[regindex],
                            (data->beeps >> (regindex << 3)) & 0xff);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_temp_beep(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        struct nct6775_data *data = nct6775_update_device(dev);
        unsigned int beep = 0;
        int nr;

        /*
         * For temperatures, there is no fixed mapping from registers to beep
         * enable bits. Beep enable bits are determined by the temperature
         * source mapping.
         */
        nr = find_temp_source(data, sattr->index, data->num_temp_beeps);
        if (nr >= 0) {
                int bit = data->BEEP_BITS[nr + TEMP_ALARM_BASE];
                beep = (data->beeps >> bit) & 0x01;
        }
        return sprintf(buf, "%u\n", beep);
}

static ssize_t
store_temp_beep(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct nct6775_data *data = dev_get_drvdata(dev);
        int nr, bit, regindex;
        unsigned long val;

        int err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;
        if (val > 1)
                return -EINVAL;

        nr = find_temp_source(data, sattr->index, data->num_temp_beeps);
        if (nr < 0)
                return -ENODEV;

        bit = data->BEEP_BITS[nr + TEMP_ALARM_BASE];
        regindex = bit >> 3;

        mutex_lock(&data->update_lock);
        if (val)
                data->beeps |= (1ULL << bit);
        else
                data->beeps &= ~(1ULL << bit);
        nct6775_write_value(data, data->REG_BEEP[regindex],
                            (data->beeps >> (regindex << 3)) & 0xff);
        mutex_unlock(&data->update_lock);

        return count;
}

static umode_t nct6775_in_is_visible(struct kobject *kobj,
                                     struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct nct6775_data *data = dev_get_drvdata(dev);
        int in = index / 5;     /* voltage index */

        if (!(data->have_in & (1 << in)))
                return 0;

        return attr->mode;
}

SENSOR_TEMPLATE_2(in_input, "in%d_input", S_IRUGO, show_in_reg, NULL, 0, 0);
SENSOR_TEMPLATE(in_alarm, "in%d_alarm", S_IRUGO, show_alarm, NULL, 0);
SENSOR_TEMPLATE(in_beep, "in%d_beep", S_IWUSR | S_IRUGO, show_beep, store_beep,
                0);
SENSOR_TEMPLATE_2(in_min, "in%d_min", S_IWUSR | S_IRUGO, show_in_reg,
                  store_in_reg, 0, 1);
SENSOR_TEMPLATE_2(in_max, "in%d_max", S_IWUSR | S_IRUGO, show_in_reg,
                  store_in_reg, 0, 2);

/*
 * nct6775_in_is_visible uses the index into the following array
 * to determine if attributes should be created or not.
 * Any change in order or content must be matched.
 */
static struct sensor_device_template *nct6775_attributes_in_template[] = {
        &sensor_dev_template_in_input,
        &sensor_dev_template_in_alarm,
        &sensor_dev_template_in_beep,
        &sensor_dev_template_in_min,
        &sensor_dev_template_in_max,
        NULL
};

static struct sensor_template_group nct6775_in_template_group = {
        .templates = nct6775_attributes_in_template,
        .is_visible = nct6775_in_is_visible,
};

static ssize_t
show_fan(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        return sprintf(buf, "%d\n", data->rpm[nr]);
}

static ssize_t
show_fan_min(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        return sprintf(buf, "%d\n",
                       data->fan_from_reg_min(data->fan_min[nr],
                                              data->fan_div[nr]));
}

static ssize_t
show_fan_div(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        return sprintf(buf, "%u\n", div_from_reg(data->fan_div[nr]));
}

static ssize_t
store_fan_min(struct device *dev, struct device_attribute *attr,
              const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err;
        unsigned int reg;
        u8 new_div;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        mutex_lock(&data->update_lock);
        if (!data->has_fan_div) {
                /* NCT6776F or NCT6779D; we know this is a 13 bit register */
                if (!val) {
                        val = 0xff1f;
                } else {
                        if (val > 1350000U)
                                val = 135000U;
                        val = 1350000U / val;
                        val = (val & 0x1f) | ((val << 3) & 0xff00);
                }
                data->fan_min[nr] = val;
                goto write_min; /* Leave fan divider alone */
        }
        if (!val) {
                /* No min limit, alarm disabled */
                data->fan_min[nr] = 255;
                new_div = data->fan_div[nr]; /* No change */
                dev_info(dev, "fan%u low limit and alarm disabled\n", nr + 1);
                goto write_div;
        }
        reg = 1350000U / val;
        if (reg >= 128 * 255) {
                /*
                 * Speed below this value cannot possibly be represented,
                 * even with the highest divider (128)
                 */
                data->fan_min[nr] = 254;
                new_div = 7; /* 128 == (1 << 7) */
                dev_warn(dev,
                         "fan%u low limit %lu below minimum %u, set to minimum\n",
                         nr + 1, val, data->fan_from_reg_min(254, 7));
        } else if (!reg) {
                /*
                 * Speed above this value cannot possibly be represented,
                 * even with the lowest divider (1)
                 */
                data->fan_min[nr] = 1;
                new_div = 0; /* 1 == (1 << 0) */
                dev_warn(dev,
                         "fan%u low limit %lu above maximum %u, set to maximum\n",
                         nr + 1, val, data->fan_from_reg_min(1, 0));
        } else {
                /*
                 * Automatically pick the best divider, i.e. the one such
                 * that the min limit will correspond to a register value
                 * in the 96..192 range
                 */
                new_div = 0;
                while (reg > 192 && new_div < 7) {
                        reg >>= 1;
                        new_div++;
                }
                data->fan_min[nr] = reg;
        }

write_div:
        /*
         * Write both the fan clock divider (if it changed) and the new
         * fan min (unconditionally)
         */
        if (new_div != data->fan_div[nr]) {
                dev_dbg(dev, "fan%u clock divider changed from %u to %u\n",
                        nr + 1, div_from_reg(data->fan_div[nr]),
                        div_from_reg(new_div));
                data->fan_div[nr] = new_div;
                nct6775_write_fan_div_common(data, nr);
                /* Give the chip time to sample a new speed value */
                data->last_updated = jiffies;
        }

write_min:
        nct6775_write_value(data, data->REG_FAN_MIN[nr], data->fan_min[nr]);
        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t
show_fan_pulses(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int p = data->fan_pulses[sattr->index];

        return sprintf(buf, "%d\n", p ? : 4);
}

static ssize_t
store_fan_pulses(struct device *dev, struct device_attribute *attr,
                 const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err;
        u8 reg;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        if (val > 4)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->fan_pulses[nr] = val & 3;
        reg = nct6775_read_value(data, data->REG_FAN_PULSES[nr]);
        reg &= ~(0x03 << data->FAN_PULSE_SHIFT[nr]);
        reg |= (val & 3) << data->FAN_PULSE_SHIFT[nr];
        nct6775_write_value(data, data->REG_FAN_PULSES[nr], reg);
        mutex_unlock(&data->update_lock);

        return count;
}

static umode_t nct6775_fan_is_visible(struct kobject *kobj,
                                      struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct nct6775_data *data = dev_get_drvdata(dev);
        int fan = index / 6;    /* fan index */
        int nr = index % 6;     /* attribute index */

        if (!(data->has_fan & (1 << fan)))
                return 0;

        if (nr == 1 && data->ALARM_BITS[FAN_ALARM_BASE + fan] == -1)
                return 0;
        if (nr == 2 && data->BEEP_BITS[FAN_ALARM_BASE + fan] == -1)
                return 0;
        if (nr == 4 && !(data->has_fan_min & (1 << fan)))
                return 0;
        if (nr == 5 && data->kind != nct6775)
                return 0;

        return attr->mode;
}

SENSOR_TEMPLATE(fan_input, "fan%d_input", S_IRUGO, show_fan, NULL, 0);
SENSOR_TEMPLATE(fan_alarm, "fan%d_alarm", S_IRUGO, show_alarm, NULL,
                FAN_ALARM_BASE);
SENSOR_TEMPLATE(fan_beep, "fan%d_beep", S_IWUSR | S_IRUGO, show_beep,
                store_beep, FAN_ALARM_BASE);
SENSOR_TEMPLATE(fan_pulses, "fan%d_pulses", S_IWUSR | S_IRUGO, show_fan_pulses,
                store_fan_pulses, 0);
SENSOR_TEMPLATE(fan_min, "fan%d_min", S_IWUSR | S_IRUGO, show_fan_min,
                store_fan_min, 0);
SENSOR_TEMPLATE(fan_div, "fan%d_div", S_IRUGO, show_fan_div, NULL, 0);

/*
 * nct6775_fan_is_visible uses the index into the following array
 * to determine if attributes should be created or not.
 * Any change in order or content must be matched.
 */
static struct sensor_device_template *nct6775_attributes_fan_template[] = {
        &sensor_dev_template_fan_input,
        &sensor_dev_template_fan_alarm, /* 1 */
        &sensor_dev_template_fan_beep,  /* 2 */
        &sensor_dev_template_fan_pulses,
        &sensor_dev_template_fan_min,   /* 4 */
        &sensor_dev_template_fan_div,   /* 5 */
        NULL
};

static struct sensor_template_group nct6775_fan_template_group = {
        .templates = nct6775_attributes_fan_template,
        .is_visible = nct6775_fan_is_visible,
        .base = 1,
};

static ssize_t
show_temp_label(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        return sprintf(buf, "%s\n", data->temp_label[data->temp_src[nr]]);
}

static ssize_t
show_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;

        return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->temp[index][nr]));
}

static ssize_t
store_temp(struct device *dev, struct device_attribute *attr, const char *buf,
           size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        int err;
        long val;

        err = kstrtol(buf, 10, &val);
        if (err < 0)
                return err;

        mutex_lock(&data->update_lock);
        data->temp[index][nr] = LM75_TEMP_TO_REG(val);
        nct6775_write_temp(data, data->reg_temp[index][nr],
                           data->temp[index][nr]);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_temp_offset(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

        return sprintf(buf, "%d\n", data->temp_offset[sattr->index] * 1000);
}

static ssize_t
store_temp_offset(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        long val;
        int err;

        err = kstrtol(buf, 10, &val);
        if (err < 0)
                return err;

        val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);

        mutex_lock(&data->update_lock);
        data->temp_offset[nr] = val;
        nct6775_write_value(data, data->REG_TEMP_OFFSET[nr], val);
        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t
show_temp_type(struct device *dev, struct device_attribute *attr, char *buf)
{

        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        return sprintf(buf, "%d\n", (int)data->temp_type[nr]);
}

static ssize_t
store_temp_type(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err;
        u8 vbat, diode, vbit, dbit;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        if (val != 1 && val != 3 && val != 4)
                return -EINVAL;

        mutex_lock(&data->update_lock);

        data->temp_type[nr] = val;
        vbit = 0x02 << nr;
        dbit = data->DIODE_MASK << nr;
        vbat = nct6775_read_value(data, data->REG_VBAT) & ~vbit;
        diode = nct6775_read_value(data, data->REG_DIODE) & ~dbit;
        switch (val) {
        case 1: /* CPU diode (diode, current mode) */
                vbat |= vbit;
                diode |= dbit;
                break;
        case 3: /* diode, voltage mode */
                vbat |= dbit;
                break;
        case 4: /* thermistor */
                break;
        }
        nct6775_write_value(data, data->REG_VBAT, vbat);
        nct6775_write_value(data, data->REG_DIODE, diode);

        mutex_unlock(&data->update_lock);
        return count;
}

static umode_t nct6775_temp_is_visible(struct kobject *kobj,
                                       struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct nct6775_data *data = dev_get_drvdata(dev);
        int temp = index / 10;  /* temp index */
        int nr = index % 10;    /* attribute index */

        if (!(data->have_temp & (1 << temp)))
                return 0;

        if (nr == 2 && find_temp_source(data, temp, data->num_temp_alarms) < 0)
                return 0;                               /* alarm */

        if (nr == 3 && find_temp_source(data, temp, data->num_temp_beeps) < 0)
                return 0;                               /* beep */

        if (nr == 4 && !data->reg_temp[1][temp])        /* max */
                return 0;

        if (nr == 5 && !data->reg_temp[2][temp])        /* max_hyst */
                return 0;

        if (nr == 6 && !data->reg_temp[3][temp])        /* crit */
                return 0;

        if (nr == 7 && !data->reg_temp[4][temp])        /* lcrit */
                return 0;

        /* offset and type only apply to fixed sensors */
        if (nr > 7 && !(data->have_temp_fixed & (1 << temp)))
                return 0;

        return attr->mode;
}

SENSOR_TEMPLATE_2(temp_input, "temp%d_input", S_IRUGO, show_temp, NULL, 0, 0);
SENSOR_TEMPLATE(temp_label, "temp%d_label", S_IRUGO, show_temp_label, NULL, 0);
SENSOR_TEMPLATE_2(temp_max, "temp%d_max", S_IRUGO | S_IWUSR, show_temp,
                  store_temp, 0, 1);
SENSOR_TEMPLATE_2(temp_max_hyst, "temp%d_max_hyst", S_IRUGO | S_IWUSR,
                  show_temp, store_temp, 0, 2);
SENSOR_TEMPLATE_2(temp_crit, "temp%d_crit", S_IRUGO | S_IWUSR, show_temp,
                  store_temp, 0, 3);
SENSOR_TEMPLATE_2(temp_lcrit, "temp%d_lcrit", S_IRUGO | S_IWUSR, show_temp,
                  store_temp, 0, 4);
SENSOR_TEMPLATE(temp_offset, "temp%d_offset", S_IRUGO | S_IWUSR,
                show_temp_offset, store_temp_offset, 0);
SENSOR_TEMPLATE(temp_type, "temp%d_type", S_IRUGO | S_IWUSR, show_temp_type,
                store_temp_type, 0);
SENSOR_TEMPLATE(temp_alarm, "temp%d_alarm", S_IRUGO, show_temp_alarm, NULL, 0);
SENSOR_TEMPLATE(temp_beep, "temp%d_beep", S_IRUGO | S_IWUSR, show_temp_beep,
                store_temp_beep, 0);

/*
 * nct6775_temp_is_visible uses the index into the following array
 * to determine if attributes should be created or not.
 * Any change in order or content must be matched.
 */
static struct sensor_device_template *nct6775_attributes_temp_template[] = {
        &sensor_dev_template_temp_input,
        &sensor_dev_template_temp_label,
        &sensor_dev_template_temp_alarm,        /* 2 */
        &sensor_dev_template_temp_beep,         /* 3 */
        &sensor_dev_template_temp_max,          /* 4 */
        &sensor_dev_template_temp_max_hyst,     /* 5 */
        &sensor_dev_template_temp_crit,         /* 6 */
        &sensor_dev_template_temp_lcrit,        /* 7 */
        &sensor_dev_template_temp_offset,       /* 8 */
        &sensor_dev_template_temp_type,         /* 9 */
        NULL
};

static struct sensor_template_group nct6775_temp_template_group = {
        .templates = nct6775_attributes_temp_template,
        .is_visible = nct6775_temp_is_visible,
        .base = 1,
};

static ssize_t
show_pwm_mode(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

        return sprintf(buf, "%d\n", !data->pwm_mode[sattr->index]);
}

static ssize_t
store_pwm_mode(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err;
        u8 reg;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        if (val > 1)
                return -EINVAL;

        /* Setting DC mode is not supported for all chips/channels */
        if (data->REG_PWM_MODE[nr] == 0) {
                if (val)
                        return -EINVAL;
                return count;
        }

        mutex_lock(&data->update_lock);
        data->pwm_mode[nr] = val;
        reg = nct6775_read_value(data, data->REG_PWM_MODE[nr]);
        reg &= ~data->PWM_MODE_MASK[nr];
        if (val)
                reg |= data->PWM_MODE_MASK[nr];
        nct6775_write_value(data, data->REG_PWM_MODE[nr], reg);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_pwm(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        int pwm;

        /*
         * For automatic fan control modes, show current pwm readings.
         * Otherwise, show the configured value.
         */
        if (index == 0 && data->pwm_enable[nr] > manual)
                pwm = nct6775_read_value(data, data->REG_PWM_READ[nr]);
        else
                pwm = data->pwm[index][nr];

        return sprintf(buf, "%d\n", pwm);
}

static ssize_t
store_pwm(struct device *dev, struct device_attribute *attr, const char *buf,
          size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        unsigned long val;
        int minval[7] = { 0, 1, 1, data->pwm[2][nr], 0, 0, 0 };
        int maxval[7]
          = { 255, 255, data->pwm[3][nr] ? : 255, 255, 255, 255, 255 };
        int err;
        u8 reg;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;
        val = clamp_val(val, minval[index], maxval[index]);

        mutex_lock(&data->update_lock);
        data->pwm[index][nr] = val;
        nct6775_write_value(data, data->REG_PWM[index][nr], val);
        if (index == 2) { /* floor: disable if val == 0 */
                reg = nct6775_read_value(data, data->REG_TEMP_SEL[nr]);
                reg &= 0x7f;
                if (val)
                        reg |= 0x80;
                nct6775_write_value(data, data->REG_TEMP_SEL[nr], reg);
        }
        mutex_unlock(&data->update_lock);
        return count;
}

/* Returns 0 if OK, -EINVAL otherwise */
static int check_trip_points(struct nct6775_data *data, int nr)
{
        int i;

        for (i = 0; i < data->auto_pwm_num - 1; i++) {
                if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1])
                        return -EINVAL;
        }
        for (i = 0; i < data->auto_pwm_num - 1; i++) {
                if (data->auto_pwm[nr][i] > data->auto_pwm[nr][i + 1])
                        return -EINVAL;
        }
        /* validate critical temperature and pwm if enabled (pwm > 0) */
        if (data->auto_pwm[nr][data->auto_pwm_num]) {
                if (data->auto_temp[nr][data->auto_pwm_num - 1] >
                                data->auto_temp[nr][data->auto_pwm_num] ||
                    data->auto_pwm[nr][data->auto_pwm_num - 1] >
                                data->auto_pwm[nr][data->auto_pwm_num])
                        return -EINVAL;
        }
        return 0;
}

static void pwm_update_registers(struct nct6775_data *data, int nr)
{
        u8 reg;

        switch (data->pwm_enable[nr]) {
        case off:
        case manual:
                break;
        case speed_cruise:
                reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
                reg = (reg & ~data->tolerance_mask) |
                  (data->target_speed_tolerance[nr] & data->tolerance_mask);
                nct6775_write_value(data, data->REG_FAN_MODE[nr], reg);
                nct6775_write_value(data, data->REG_TARGET[nr],
                                    data->target_speed[nr] & 0xff);
                if (data->REG_TOLERANCE_H) {
                        reg = (data->target_speed[nr] >> 8) & 0x0f;
                        reg |= (data->target_speed_tolerance[nr] & 0x38) << 1;
                        nct6775_write_value(data,
                                            data->REG_TOLERANCE_H[nr],
                                            reg);
                }
                break;
        case thermal_cruise:
                nct6775_write_value(data, data->REG_TARGET[nr],
                                    data->target_temp[nr]);
                /* intentional */
        default:
                reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
                reg = (reg & ~data->tolerance_mask) |
                  data->temp_tolerance[0][nr];
                nct6775_write_value(data, data->REG_FAN_MODE[nr], reg);
                break;
        }
}

static ssize_t
show_pwm_enable(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

        return sprintf(buf, "%d\n", data->pwm_enable[sattr->index]);
}

static ssize_t
store_pwm_enable(struct device *dev, struct device_attribute *attr,
                 const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err;
        u16 reg;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        if (val > sf4)
                return -EINVAL;

        if (val == sf3 && data->kind != nct6775)
                return -EINVAL;

        if (val == sf4 && check_trip_points(data, nr)) {
                dev_err(dev, "Inconsistent trip points, not switching to SmartFan IV mode\n");
                dev_err(dev, "Adjust trip points and try again\n");
                return -EINVAL;
        }

        mutex_lock(&data->update_lock);
        data->pwm_enable[nr] = val;
        if (val == off) {
                /*
                 * turn off pwm control: select manual mode, set pwm to maximum
                 */
                data->pwm[0][nr] = 255;
                nct6775_write_value(data, data->REG_PWM[0][nr], 255);
        }
        pwm_update_registers(data, nr);
        reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
        reg &= 0x0f;
        reg |= pwm_enable_to_reg(val) << 4;
        nct6775_write_value(data, data->REG_FAN_MODE[nr], reg);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_pwm_temp_sel_common(struct nct6775_data *data, char *buf, int src)
{
        int i, sel = 0;

        for (i = 0; i < NUM_TEMP; i++) {
                if (!(data->have_temp & (1 << i)))
                        continue;
                if (src == data->temp_src[i]) {
                        sel = i + 1;
                        break;
                }
        }

        return sprintf(buf, "%d\n", sel);
}

static ssize_t
show_pwm_temp_sel(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int index = sattr->index;

        return show_pwm_temp_sel_common(data, buf, data->pwm_temp_sel[index]);
}

static ssize_t
store_pwm_temp_sel(struct device *dev, struct device_attribute *attr,
                   const char *buf, size_t count)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err, reg, src;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;
        if (val == 0 || val > NUM_TEMP)
                return -EINVAL;
        if (!(data->have_temp & (1 << (val - 1))) || !data->temp_src[val - 1])
                return -EINVAL;

        mutex_lock(&data->update_lock);
        src = data->temp_src[val - 1];
        data->pwm_temp_sel[nr] = src;
        reg = nct6775_read_value(data, data->REG_TEMP_SEL[nr]);
        reg &= 0xe0;
        reg |= src;
        nct6775_write_value(data, data->REG_TEMP_SEL[nr], reg);
        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t
show_pwm_weight_temp_sel(struct device *dev, struct device_attribute *attr,
                         char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int index = sattr->index;

        return show_pwm_temp_sel_common(data, buf,
                                        data->pwm_weight_temp_sel[index]);
}

static ssize_t
store_pwm_weight_temp_sel(struct device *dev, struct device_attribute *attr,
                          const char *buf, size_t count)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err, reg, src;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;
        if (val > NUM_TEMP)
                return -EINVAL;
        if (val && (!(data->have_temp & (1 << (val - 1))) ||
                    !data->temp_src[val - 1]))
                return -EINVAL;

        mutex_lock(&data->update_lock);
        if (val) {
                src = data->temp_src[val - 1];
                data->pwm_weight_temp_sel[nr] = src;
                reg = nct6775_read_value(data, data->REG_WEIGHT_TEMP_SEL[nr]);
                reg &= 0xe0;
                reg |= (src | 0x80);
                nct6775_write_value(data, data->REG_WEIGHT_TEMP_SEL[nr], reg);
        } else {
                data->pwm_weight_temp_sel[nr] = 0;
                reg = nct6775_read_value(data, data->REG_WEIGHT_TEMP_SEL[nr]);
                reg &= 0x7f;
                nct6775_write_value(data, data->REG_WEIGHT_TEMP_SEL[nr], reg);
        }
        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t
show_target_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

        return sprintf(buf, "%d\n", data->target_temp[sattr->index] * 1000);
}

static ssize_t
store_target_temp(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0,
                        data->target_temp_mask);

        mutex_lock(&data->update_lock);
        data->target_temp[nr] = val;
        pwm_update_registers(data, nr);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_target_speed(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;

        return sprintf(buf, "%d\n",
                       fan_from_reg16(data->target_speed[nr],
                                      data->fan_div[nr]));
}

static ssize_t
store_target_speed(struct device *dev, struct device_attribute *attr,
                   const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err;
        u16 speed;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        val = clamp_val(val, 0, 1350000U);
        speed = fan_to_reg(val, data->fan_div[nr]);

        mutex_lock(&data->update_lock);
        data->target_speed[nr] = speed;
        pwm_update_registers(data, nr);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_temp_tolerance(struct device *dev, struct device_attribute *attr,
                    char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;

        return sprintf(buf, "%d\n", data->temp_tolerance[index][nr] * 1000);
}

static ssize_t
store_temp_tolerance(struct device *dev, struct device_attribute *attr,
                     const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        unsigned long val;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        /* Limit tolerance as needed */
        val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, data->tolerance_mask);

        mutex_lock(&data->update_lock);
        data->temp_tolerance[index][nr] = val;
        if (index)
                pwm_update_registers(data, nr);
        else
                nct6775_write_value(data,
                                    data->REG_CRITICAL_TEMP_TOLERANCE[nr],
                                    val);
        mutex_unlock(&data->update_lock);
        return count;
}

/*
 * Fan speed tolerance is a tricky beast, since the associated register is
 * a tick counter, but the value is reported and configured as rpm.
 * Compute resulting low and high rpm values and report the difference.
 */
static ssize_t
show_speed_tolerance(struct device *dev, struct device_attribute *attr,
                     char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        int low = data->target_speed[nr] - data->target_speed_tolerance[nr];
        int high = data->target_speed[nr] + data->target_speed_tolerance[nr];
        int tolerance;

        if (low <= 0)
                low = 1;
        if (high > 0xffff)
                high = 0xffff;
        if (high < low)
                high = low;

        tolerance = (fan_from_reg16(low, data->fan_div[nr])
                     - fan_from_reg16(high, data->fan_div[nr])) / 2;

        return sprintf(buf, "%d\n", tolerance);
}

static ssize_t
store_speed_tolerance(struct device *dev, struct device_attribute *attr,
                      const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
        int nr = sattr->index;
        unsigned long val;
        int err;
        int low, high;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        high = fan_from_reg16(data->target_speed[nr],
                              data->fan_div[nr]) + val;
        low = fan_from_reg16(data->target_speed[nr],
                             data->fan_div[nr]) - val;
        if (low <= 0)
                low = 1;
        if (high < low)
                high = low;

        val = (fan_to_reg(low, data->fan_div[nr]) -
               fan_to_reg(high, data->fan_div[nr])) / 2;

        /* Limit tolerance as needed */
        val = clamp_val(val, 0, data->speed_tolerance_limit);

        mutex_lock(&data->update_lock);
        data->target_speed_tolerance[nr] = val;
        pwm_update_registers(data, nr);
        mutex_unlock(&data->update_lock);
        return count;
}

SENSOR_TEMPLATE_2(pwm, "pwm%d", S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0, 0);
SENSOR_TEMPLATE(pwm_mode, "pwm%d_mode", S_IWUSR | S_IRUGO, show_pwm_mode,
                store_pwm_mode, 0);
SENSOR_TEMPLATE(pwm_enable, "pwm%d_enable", S_IWUSR | S_IRUGO, show_pwm_enable,
                store_pwm_enable, 0);
SENSOR_TEMPLATE(pwm_temp_sel, "pwm%d_temp_sel", S_IWUSR | S_IRUGO,
                show_pwm_temp_sel, store_pwm_temp_sel, 0);
SENSOR_TEMPLATE(pwm_target_temp, "pwm%d_target_temp", S_IWUSR | S_IRUGO,
                show_target_temp, store_target_temp, 0);
SENSOR_TEMPLATE(fan_target, "fan%d_target", S_IWUSR | S_IRUGO,
                show_target_speed, store_target_speed, 0);
SENSOR_TEMPLATE(fan_tolerance, "fan%d_tolerance", S_IWUSR | S_IRUGO,
                show_speed_tolerance, store_speed_tolerance, 0);

/* Smart Fan registers */

static ssize_t
show_weight_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;

        return sprintf(buf, "%d\n", data->weight_temp[index][nr] * 1000);
}

static ssize_t
store_weight_temp(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        unsigned long val;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);

        mutex_lock(&data->update_lock);
        data->weight_temp[index][nr] = val;
        nct6775_write_value(data, data->REG_WEIGHT_TEMP[index][nr], val);
        mutex_unlock(&data->update_lock);
        return count;
}

SENSOR_TEMPLATE(pwm_weight_temp_sel, "pwm%d_weight_temp_sel", S_IWUSR | S_IRUGO,
                  show_pwm_weight_temp_sel, store_pwm_weight_temp_sel, 0);
SENSOR_TEMPLATE_2(pwm_weight_temp_step, "pwm%d_weight_temp_step",
                  S_IWUSR | S_IRUGO, show_weight_temp, store_weight_temp, 0, 0);
SENSOR_TEMPLATE_2(pwm_weight_temp_step_tol, "pwm%d_weight_temp_step_tol",
                  S_IWUSR | S_IRUGO, show_weight_temp, store_weight_temp, 0, 1);
SENSOR_TEMPLATE_2(pwm_weight_temp_step_base, "pwm%d_weight_temp_step_base",
                  S_IWUSR | S_IRUGO, show_weight_temp, store_weight_temp, 0, 2);
SENSOR_TEMPLATE_2(pwm_weight_duty_step, "pwm%d_weight_duty_step",
                  S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0, 5);
SENSOR_TEMPLATE_2(pwm_weight_duty_base, "pwm%d_weight_duty_base",
                  S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0, 6);

static ssize_t
show_fan_time(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;

        return sprintf(buf, "%d\n",
                       step_time_from_reg(data->fan_time[index][nr],
                                          data->pwm_mode[nr]));
}

static ssize_t
store_fan_time(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        unsigned long val;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;

        val = step_time_to_reg(val, data->pwm_mode[nr]);
        mutex_lock(&data->update_lock);
        data->fan_time[index][nr] = val;
        nct6775_write_value(data, data->REG_FAN_TIME[index][nr], val);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_name(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = dev_get_drvdata(dev);

        return sprintf(buf, "%s\n", data->name);
}

static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static ssize_t
show_auto_pwm(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);

        return sprintf(buf, "%d\n", data->auto_pwm[sattr->nr][sattr->index]);
}

static ssize_t
store_auto_pwm(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int point = sattr->index;
        unsigned long val;
        int err;
        u8 reg;

        err = kstrtoul(buf, 10, &val);
        if (err < 0)
                return err;
        if (val > 255)
                return -EINVAL;

        if (point == data->auto_pwm_num) {
                if (data->kind != nct6775 && !val)
                        return -EINVAL;
                if (data->kind != nct6779 && val)
                        val = 0xff;
        }

        mutex_lock(&data->update_lock);
        data->auto_pwm[nr][point] = val;
        if (point < data->auto_pwm_num) {
                nct6775_write_value(data,
                                    NCT6775_AUTO_PWM(data, nr, point),
                                    data->auto_pwm[nr][point]);
        } else {
                switch (data->kind) {
                case nct6775:
                        /* disable if needed (pwm == 0) */
                        reg = nct6775_read_value(data,
                                                 NCT6775_REG_CRITICAL_ENAB[nr]);
                        if (val)
                                reg |= 0x02;
                        else
                                reg &= ~0x02;
                        nct6775_write_value(data, NCT6775_REG_CRITICAL_ENAB[nr],
                                            reg);
                        break;
                case nct6776:
                        break; /* always enabled, nothing to do */
                case nct6106:
                case nct6779:
                case nct6791:
                        nct6775_write_value(data, data->REG_CRITICAL_PWM[nr],
                                            val);
                        reg = nct6775_read_value(data,
                                        data->REG_CRITICAL_PWM_ENABLE[nr]);
                        if (val == 255)
                                reg &= ~data->CRITICAL_PWM_ENABLE_MASK;
                        else
                                reg |= data->CRITICAL_PWM_ENABLE_MASK;
                        nct6775_write_value(data,
                                            data->REG_CRITICAL_PWM_ENABLE[nr],
                                            reg);
                        break;
                }
        }
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_auto_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = nct6775_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int point = sattr->index;

        /*
         * We don't know for sure if the temperature is signed or unsigned.
         * Assume it is unsigned.
         */
        return sprintf(buf, "%d\n", data->auto_temp[nr][point] * 1000);
}

static ssize_t
store_auto_temp(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int point = sattr->index;
        unsigned long val;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err)
                return err;
        if (val > 255000)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->auto_temp[nr][point] = DIV_ROUND_CLOSEST(val, 1000);
        if (point < data->auto_pwm_num) {
                nct6775_write_value(data,
                                    NCT6775_AUTO_TEMP(data, nr, point),
                                    data->auto_temp[nr][point]);
        } else {
                nct6775_write_value(data, data->REG_CRITICAL_TEMP[nr],
                                    data->auto_temp[nr][point]);
        }
        mutex_unlock(&data->update_lock);
        return count;
}

static umode_t nct6775_pwm_is_visible(struct kobject *kobj,
                                      struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct nct6775_data *data = dev_get_drvdata(dev);
        int pwm = index / 36;   /* pwm index */
        int nr = index % 36;    /* attribute index */

        if (!(data->has_pwm & (1 << pwm)))
                return 0;

        if (nr == 19 && data->REG_PWM[3] == NULL) /* pwm_max */
                return 0;
        if (nr == 20 && data->REG_PWM[4] == NULL) /* pwm_step */
                return 0;
        if (nr == 21 && data->REG_PWM[6] == NULL) /* weight_duty_base */
                return 0;

        if (nr >= 22 && nr <= 35) {             /* auto point */
                int api = (nr - 22) / 2;        /* auto point index */

                if (api > data->auto_pwm_num)
                        return 0;
        }
        return attr->mode;
}

SENSOR_TEMPLATE_2(pwm_stop_time, "pwm%d_stop_time", S_IWUSR | S_IRUGO,
                  show_fan_time, store_fan_time, 0, 0);
SENSOR_TEMPLATE_2(pwm_step_up_time, "pwm%d_step_up_time", S_IWUSR | S_IRUGO,
                  show_fan_time, store_fan_time, 0, 1);
SENSOR_TEMPLATE_2(pwm_step_down_time, "pwm%d_step_down_time", S_IWUSR | S_IRUGO,
                  show_fan_time, store_fan_time, 0, 2);
SENSOR_TEMPLATE_2(pwm_start, "pwm%d_start", S_IWUSR | S_IRUGO, show_pwm,
                  store_pwm, 0, 1);
SENSOR_TEMPLATE_2(pwm_floor, "pwm%d_floor", S_IWUSR | S_IRUGO, show_pwm,
                  store_pwm, 0, 2);
SENSOR_TEMPLATE_2(pwm_temp_tolerance, "pwm%d_temp_tolerance", S_IWUSR | S_IRUGO,
                  show_temp_tolerance, store_temp_tolerance, 0, 0);
SENSOR_TEMPLATE_2(pwm_crit_temp_tolerance, "pwm%d_crit_temp_tolerance",
                  S_IWUSR | S_IRUGO, show_temp_tolerance, store_temp_tolerance,
                  0, 1);

SENSOR_TEMPLATE_2(pwm_max, "pwm%d_max", S_IWUSR | S_IRUGO, show_pwm, store_pwm,
                  0, 3);

SENSOR_TEMPLATE_2(pwm_step, "pwm%d_step", S_IWUSR | S_IRUGO, show_pwm,
                  store_pwm, 0, 4);

SENSOR_TEMPLATE_2(pwm_auto_point1_pwm, "pwm%d_auto_point1_pwm",
                  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 0);
SENSOR_TEMPLATE_2(pwm_auto_point1_temp, "pwm%d_auto_point1_temp",
                  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 0);

SENSOR_TEMPLATE_2(pwm_auto_point2_pwm, "pwm%d_auto_point2_pwm",
                  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 1);
SENSOR_TEMPLATE_2(pwm_auto_point2_temp, "pwm%d_auto_point2_temp",
                  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 1);

SENSOR_TEMPLATE_2(pwm_auto_point3_pwm, "pwm%d_auto_point3_pwm",
                  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 2);
SENSOR_TEMPLATE_2(pwm_auto_point3_temp, "pwm%d_auto_point3_temp",
                  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 2);

SENSOR_TEMPLATE_2(pwm_auto_point4_pwm, "pwm%d_auto_point4_pwm",
                  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 3);
SENSOR_TEMPLATE_2(pwm_auto_point4_temp, "pwm%d_auto_point4_temp",
                  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 3);

SENSOR_TEMPLATE_2(pwm_auto_point5_pwm, "pwm%d_auto_point5_pwm",
                  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 4);
SENSOR_TEMPLATE_2(pwm_auto_point5_temp, "pwm%d_auto_point5_temp",
                  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 4);

SENSOR_TEMPLATE_2(pwm_auto_point6_pwm, "pwm%d_auto_point6_pwm",
                  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 5);
SENSOR_TEMPLATE_2(pwm_auto_point6_temp, "pwm%d_auto_point6_temp",
                  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 5);

SENSOR_TEMPLATE_2(pwm_auto_point7_pwm, "pwm%d_auto_point7_pwm",
                  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 6);
SENSOR_TEMPLATE_2(pwm_auto_point7_temp, "pwm%d_auto_point7_temp",
                  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 6);

/*
 * nct6775_pwm_is_visible uses the index into the following array
 * to determine if attributes should be created or not.
 * Any change in order or content must be matched.
 */
static struct sensor_device_template *nct6775_attributes_pwm_template[] = {
        &sensor_dev_template_pwm,
        &sensor_dev_template_pwm_mode,
        &sensor_dev_template_pwm_enable,
        &sensor_dev_template_pwm_temp_sel,
        &sensor_dev_template_pwm_temp_tolerance,
        &sensor_dev_template_pwm_crit_temp_tolerance,
        &sensor_dev_template_pwm_target_temp,
        &sensor_dev_template_fan_target,
        &sensor_dev_template_fan_tolerance,
        &sensor_dev_template_pwm_stop_time,
        &sensor_dev_template_pwm_step_up_time,
        &sensor_dev_template_pwm_step_down_time,
        &sensor_dev_template_pwm_start,
        &sensor_dev_template_pwm_floor,
        &sensor_dev_template_pwm_weight_temp_sel,
        &sensor_dev_template_pwm_weight_temp_step,
        &sensor_dev_template_pwm_weight_temp_step_tol,
        &sensor_dev_template_pwm_weight_temp_step_base,
        &sensor_dev_template_pwm_weight_duty_step,
        &sensor_dev_template_pwm_max,                   /* 19 */
        &sensor_dev_template_pwm_step,                  /* 20 */
        &sensor_dev_template_pwm_weight_duty_base,      /* 21 */
        &sensor_dev_template_pwm_auto_point1_pwm,       /* 22 */
        &sensor_dev_template_pwm_auto_point1_temp,
        &sensor_dev_template_pwm_auto_point2_pwm,
        &sensor_dev_template_pwm_auto_point2_temp,
        &sensor_dev_template_pwm_auto_point3_pwm,
        &sensor_dev_template_pwm_auto_point3_temp,
        &sensor_dev_template_pwm_auto_point4_pwm,
        &sensor_dev_template_pwm_auto_point4_temp,
        &sensor_dev_template_pwm_auto_point5_pwm,
        &sensor_dev_template_pwm_auto_point5_temp,
        &sensor_dev_template_pwm_auto_point6_pwm,
        &sensor_dev_template_pwm_auto_point6_temp,
        &sensor_dev_template_pwm_auto_point7_pwm,
        &sensor_dev_template_pwm_auto_point7_temp,      /* 35 */

        NULL
};

static struct sensor_template_group nct6775_pwm_template_group = {
        .templates = nct6775_attributes_pwm_template,
        .is_visible = nct6775_pwm_is_visible,
        .base = 1,
};

static ssize_t
show_vid(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct nct6775_data *data = dev_get_drvdata(dev);
        return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));