/*
 *
 * Device driver for GPIO attached remote control interfaces
 * on Conexant 2388x based TV/DVB cards.
 *
 * Copyright (c) 2003 Pavel Machek
 * Copyright (c) 2004 Gerd Knorr
 * Copyright (c) 2004, 2005 Chris Pascoe
 *
 * 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.
 */

#include "cx88.h"

#include <linux/init.h>
#include <linux/hrtimer.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/module.h>

#include <media/rc-core.h>

#define MODULE_NAME "cx88xx"

/* ---------------------------------------------------------------------- */

struct cx88_IR {
        struct cx88_core *core;
        struct rc_dev *dev;

        int users;

        char name[32];
        char phys[32];

        /* sample from gpio pin 16 */
        u32 sampling;

        /* poll external decoder */
        int polling;
        struct hrtimer timer;
        u32 gpio_addr;
        u32 last_gpio;
        u32 mask_keycode;
        u32 mask_keydown;
        u32 mask_keyup;
};

static unsigned int ir_samplerate = 4;
module_param(ir_samplerate, uint, 0444);
MODULE_PARM_DESC(ir_samplerate, "IR samplerate in kHz, 1 - 20, default 4");

static int ir_debug;
module_param(ir_debug, int, 0644);      /* debug level [IR] */
MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");

#define ir_dprintk(fmt, arg...) do {                                    \
        if (ir_debug)                                                   \
                printk(KERN_DEBUG "%s IR: " fmt, ir->core->name, ##arg);\
} while (0)

#define dprintk(fmt, arg...) do {                                       \
        if (ir_debug)                                                   \
                printk(KERN_DEBUG "cx88 IR: " fmt, ##arg);              \
} while (0)

/* ---------------------------------------------------------------------- */

static void cx88_ir_handle_key(struct cx88_IR *ir)
{
        struct cx88_core *core = ir->core;
        u32 gpio, data, auxgpio;

        /* read gpio value */
        gpio = cx_read(ir->gpio_addr);
        switch (core->boardnr) {
        case CX88_BOARD_NPGTECH_REALTV_TOP10FM:
                /*
                 * This board apparently uses a combination of 2 GPIO
                 * to represent the keys. Additionally, the second GPIO
                 * can be used for parity.
                 *
                 * Example:
                 *
                 * for key "5"
                 *      gpio = 0x758, auxgpio = 0xe5 or 0xf5
                 * for key "Power"
                 *      gpio = 0x758, auxgpio = 0xed or 0xfd
                 */

                auxgpio = cx_read(MO_GP1_IO);
                /* Take out the parity part */
                gpio = (gpio & 0x7fd) + (auxgpio & 0xef);
                break;
        case CX88_BOARD_WINFAST_DTV1000:
        case CX88_BOARD_WINFAST_DTV1800H:
        case CX88_BOARD_WINFAST_DTV1800H_XC4000:
        case CX88_BOARD_WINFAST_DTV2000H_PLUS:
        case CX88_BOARD_WINFAST_TV2000_XP_GLOBAL:
        case CX88_BOARD_WINFAST_TV2000_XP_GLOBAL_6F36:
        case CX88_BOARD_WINFAST_TV2000_XP_GLOBAL_6F43:
                gpio = (gpio & 0x6ff) | ((cx_read(MO_GP1_IO) << 8) & 0x900);
                auxgpio = gpio;
                break;
        default:
                auxgpio = gpio;
        }
        if (ir->polling) {
                if (ir->last_gpio == auxgpio)
                        return;
                ir->last_gpio = auxgpio;
        }

        /* extract data */
        data = ir_extract_bits(gpio, ir->mask_keycode);
        ir_dprintk("irq gpio=0x%x code=%d | %s%s%s\n",
                   gpio, data,
                   ir->polling ? "poll" : "irq",
                   (gpio & ir->mask_keydown) ? " down" : "",
                   (gpio & ir->mask_keyup) ? " up" : "");

        if (ir->core->boardnr == CX88_BOARD_NORWOOD_MICRO) {
                u32 gpio_key = cx_read(MO_GP0_IO);

                data = (data << 4) | ((gpio_key & 0xf0) >> 4);

                rc_keydown(ir->dev, RC_PROTO_UNKNOWN, data, 0);

        } else if (ir->core->boardnr == CX88_BOARD_PROLINK_PLAYTVPVR ||
                   ir->core->boardnr == CX88_BOARD_PIXELVIEW_PLAYTV_ULTRA_PRO) {
                /* bit cleared on keydown, NEC scancode, 0xAAAACC, A = 0x866b */
                u16 addr;
                u8 cmd;
                u32 scancode;

                addr = (data >> 8) & 0xffff;
                cmd  = (data >> 0) & 0x00ff;
                scancode = RC_SCANCODE_NECX(addr, cmd);

                if (0 == (gpio & ir->mask_keyup))
                        rc_keydown_notimeout(ir->dev, RC_PROTO_NECX, scancode,
                                             0);
                else
                        rc_keyup(ir->dev);

        } else if (ir->mask_keydown) {
                /* bit set on keydown */
                if (gpio & ir->mask_keydown)
                        rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data,
                                             0);
                else
                        rc_keyup(ir->dev);

        } else if (ir->mask_keyup) {
                /* bit cleared on keydown */
                if (0 == (gpio & ir->mask_keyup))
                        rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data,
                                             0);
                else
                        rc_keyup(ir->dev);

        } else {
                /* can't distinguish keydown/up :-/ */
                rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data, 0);
                rc_keyup(ir->dev);
        }
}

static enum hrtimer_restart cx88_ir_work(struct hrtimer *timer)
{
        unsigned long missed;
        struct cx88_IR *ir = container_of(timer, struct cx88_IR, timer);

        cx88_ir_handle_key(ir);
        missed = hrtimer_forward_now(&ir->timer, ir->polling * 1000000LL);
        if (missed > 1)
                ir_dprintk("Missed ticks %ld\n", missed - 1);

        return HRTIMER_RESTART;
}

static int __cx88_ir_start(void *priv)
{
        struct cx88_core *core = priv;
        struct cx88_IR *ir;

        if (!core || !core->ir)
                return -EINVAL;

        ir = core->ir;

        if (ir->polling) {
                hrtimer_init(&ir->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
                ir->timer.function = cx88_ir_work;
                hrtimer_start(&ir->timer, ir->polling * 1000000LL,
                              HRTIMER_MODE_REL);
        }
        if (ir->sampling) {
                core->pci_irqmask |= PCI_INT_IR_SMPINT;
                cx_write(MO_DDS_IO, 0x33F286 * ir_samplerate); /* samplerate */
                cx_write(MO_DDSCFG_IO, 0x5); /* enable */
        }
        return 0;
}

static void __cx88_ir_stop(void *priv)
{
        struct cx88_core *core = priv;
        struct cx88_IR *ir;

        if (!core || !core->ir)
                return;

        ir = core->ir;
        if (ir->sampling) {
                cx_write(MO_DDSCFG_IO, 0x0);
                core->pci_irqmask &= ~PCI_INT_IR_SMPINT;
        }

        if (ir->polling)
                hrtimer_cancel(&ir->timer);
}

int cx88_ir_start(struct cx88_core *core)
{
        if (core->ir->users)
                return __cx88_ir_start(core);

        return 0;
}
EXPORT_SYMBOL(cx88_ir_start);

void cx88_ir_stop(struct cx88_core *core)
{
        if (core->ir->users)
                __cx88_ir_stop(core);
}
EXPORT_SYMBOL(cx88_ir_stop);

static int cx88_ir_open(struct rc_dev *rc)
{
        struct cx88_core *core = rc->priv;

        core->ir->users++;
        return __cx88_ir_start(core);
}

static void cx88_ir_close(struct rc_dev *rc)
{
        struct cx88_core *core = rc->priv;

        core->ir->users--;
        if (!core->ir->users)
                __cx88_ir_stop(core);
}

/* ---------------------------------------------------------------------- */

int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci)
{
        struct cx88_IR *ir;
        struct rc_dev *dev;
        char *ir_codes = NULL;
        u64 rc_proto = RC_PROTO_BIT_OTHER;
        int err = -ENOMEM;
        u32 hardware_mask = 0;  /* For devices with a hardware mask, when
                                 * used with a full-code IR table
                                 */

        ir = kzalloc(sizeof(*ir), GFP_KERNEL);
        dev = rc_allocate_device(RC_DRIVER_IR_RAW);
        if (!ir || !dev)
                goto err_out_free;

        ir->dev = dev;

        /* detect & configure */
        switch (core->boardnr) {
        case CX88_BOARD_DNTV_LIVE_DVB_T:
        case CX88_BOARD_KWORLD_DVB_T:
        case CX88_BOARD_KWORLD_DVB_T_CX22702:
                ir_codes = RC_MAP_DNTV_LIVE_DVB_T;
                ir->gpio_addr = MO_GP1_IO;
                ir->mask_keycode = 0x1f;
                ir->mask_keyup = 0x60;
                ir->polling = 50; /* ms */
                break;
        case CX88_BOARD_TERRATEC_CINERGY_1400_DVB_T1:
                ir_codes = RC_MAP_CINERGY_1400;
                ir->sampling = 0xeb04; /* address */
                break;
        case CX88_BOARD_HAUPPAUGE:
        case CX88_BOARD_HAUPPAUGE_DVB_T1:
        case CX88_BOARD_HAUPPAUGE_NOVASE2_S1:
        case CX88_BOARD_HAUPPAUGE_NOVASPLUS_S1:
        case CX88_BOARD_HAUPPAUGE_HVR1100:
        case CX88_BOARD_HAUPPAUGE_HVR3000:
        case CX88_BOARD_HAUPPAUGE_HVR4000:
        case CX88_BOARD_HAUPPAUGE_HVR4000LITE:
        case CX88_BOARD_PCHDTV_HD3000:
        case CX88_BOARD_PCHDTV_HD5500:
        case CX88_BOARD_HAUPPAUGE_IRONLY:
                ir_codes = RC_MAP_HAUPPAUGE;
                ir->sampling = 1;
                break;
        case CX88_BOARD_WINFAST_DTV2000H:
        case CX88_BOARD_WINFAST_DTV2000H_J:
        case CX88_BOARD_WINFAST_DTV1800H:
        case CX88_BOARD_WINFAST_DTV1800H_XC4000:
        case CX88_BOARD_WINFAST_DTV2000H_PLUS:
                ir_codes = RC_MAP_WINFAST;
                ir->gpio_addr = MO_GP0_IO;
                ir->mask_keycode = 0x8f8;
                ir->mask_keyup = 0x100;
                ir->polling = 50; /* ms */
                break;
        case CX88_BOARD_WINFAST2000XP_EXPERT:
        case CX88_BOARD_WINFAST_DTV1000:
        case CX88_BOARD_WINFAST_TV2000_XP_GLOBAL:
        case CX88_BOARD_WINFAST_TV2000_XP_GLOBAL_6F36:
        case CX88_BOARD_WINFAST_TV2000_XP_GLOBAL_6F43:
                ir_codes = RC_MAP_WINFAST;
                ir->gpio_addr = MO_GP0_IO;
                ir->mask_keycode = 0x8f8;
                ir->mask_keyup = 0x100;
                ir->polling = 1; /* ms */
                break;
        case CX88_BOARD_IODATA_GVBCTV7E:
                ir_codes = RC_MAP_IODATA_BCTV7E;
                ir->gpio_addr = MO_GP0_IO;
                ir->mask_keycode = 0xfd;
                ir->mask_keydown = 0x02;
                ir->polling = 5; /* ms */
                break;
        case CX88_BOARD_PROLINK_PLAYTVPVR:
        case CX88_BOARD_PIXELVIEW_PLAYTV_ULTRA_PRO:
                /*
                 * It seems that this hardware is paired with NEC extended
                 * address 0x866b. So, unfortunately, its usage with other
                 * IR's with different address won't work. Still, there are
                 * other IR's from the same manufacturer that works, like the
                 * 002-T mini RC, provided with newer PV hardware
                 */
                ir_codes = RC_MAP_PIXELVIEW_MK12;
                rc_proto = RC_PROTO_BIT_NECX;
                ir->gpio_addr = MO_GP1_IO;
                ir->mask_keyup = 0x80;
                ir->polling = 10; /* ms */
                hardware_mask = 0x3f;   /* Hardware returns only 6 bits from command part */
                break;
        case CX88_BOARD_PROLINK_PV_8000GT:
        case CX88_BOARD_PROLINK_PV_GLOBAL_XTREME:
                ir_codes = RC_MAP_PIXELVIEW_NEW;
                ir->gpio_addr = MO_GP1_IO;
                ir->mask_keycode = 0x3f;
                ir->mask_keyup = 0x80;
                ir->polling = 1; /* ms */
                break;
        case CX88_BOARD_KWORLD_LTV883:
                ir_codes = RC_MAP_PIXELVIEW;
                ir->gpio_addr = MO_GP1_IO;
                ir->mask_keycode = 0x1f;
                ir->mask_keyup = 0x60;
                ir->polling = 1; /* ms */
                break;
        case CX88_BOARD_ADSTECH_DVB_T_PCI:
                ir_codes = RC_MAP_ADSTECH_DVB_T_PCI;
                ir->gpio_addr = MO_GP1_IO;
                ir->mask_keycode = 0xbf;
                ir->mask_keyup = 0x40;
                ir->polling = 50; /* ms */
                break;
        case CX88_BOARD_MSI_TVANYWHERE_MASTER:
                ir_codes = RC_MAP_MSI_TVANYWHERE;
                ir->gpio_addr = MO_GP1_IO;
                ir->mask_keycode = 0x1f;
                ir->mask_keyup = 0x40;
                ir->polling = 1; /* ms */
                break;
        case CX88_BOARD_AVERTV_303:
        case CX88_BOARD_AVERTV_STUDIO_303:
                ir_codes         = RC_MAP_AVERTV_303;
                ir->gpio_addr    = MO_GP2_IO;
                ir->mask_keycode = 0xfb;
                ir->mask_keydown = 0x02;
                ir->polling      = 50; /* ms */
                break;
        case CX88_BOARD_OMICOM_SS4_PCI:
        case CX88_BOARD_SATTRADE_ST4200:
        case CX88_BOARD_TBS_8920:
        case CX88_BOARD_TBS_8910:
        case CX88_BOARD_PROF_7300:
        case CX88_BOARD_PROF_7301:
        case CX88_BOARD_PROF_6200:
                ir_codes = RC_MAP_TBS_NEC;
                ir->sampling = 0xff00; /* address */
                break;
        case CX88_BOARD_TEVII_S464:
        case CX88_BOARD_TEVII_S460:
        case CX88_BOARD_TEVII_S420:
                ir_codes = RC_MAP_TEVII_NEC;
                ir->sampling = 0xff00; /* address */
                break;
        case CX88_BOARD_DNTV_LIVE_DVB_T_PRO:
                ir_codes         = RC_MAP_DNTV_LIVE_DVBT_PRO;
                ir->sampling     = 0xff00; /* address */
                break;
        case CX88_BOARD_NORWOOD_MICRO:
                ir_codes         = RC_MAP_NORWOOD;
                ir->gpio_addr    = MO_GP1_IO;
                ir->mask_keycode = 0x0e;
                ir->mask_keyup   = 0x80;
                ir->polling      = 50; /* ms */
                break;
        case CX88_BOARD_NPGTECH_REALTV_TOP10FM:
                ir_codes         = RC_MAP_NPGTECH;
                ir->gpio_addr    = MO_GP0_IO;
                ir->mask_keycode = 0xfa;
                ir->polling      = 50; /* ms */
                break;
        case CX88_BOARD_PINNACLE_PCTV_HD_800i:
                ir_codes         = RC_MAP_PINNACLE_PCTV_HD;
                ir->sampling     = 1;
                break;
        case CX88_BOARD_POWERCOLOR_REAL_ANGEL:
                ir_codes         = RC_MAP_POWERCOLOR_REAL_ANGEL;
                ir->gpio_addr    = MO_GP2_IO;
                ir->mask_keycode = 0x7e;
                ir->polling      = 100; /* ms */
                break;
        case CX88_BOARD_TWINHAN_VP1027_DVBS:
                ir_codes         = RC_MAP_TWINHAN_VP1027_DVBS;
                ir->sampling     = 0xff00; /* address */
                break;
        }

        if (!ir_codes) {
                err = -ENODEV;
                goto err_out_free;
        }

        /*
         * The usage of mask_keycode were very convenient, due to several
         * reasons. Among others, the scancode tables were using the scancode
         * as the index elements. So, the less bits it was used, the smaller
         * the table were stored. After the input changes, the better is to use
         * the full scancodes, since it allows replacing the IR remote by
         * another one. Unfortunately, there are still some hardware, like
         * Pixelview Ultra Pro, where only part of the scancode is sent via
         * GPIO. So, there's no way to get the full scancode. Due to that,
         * hardware_mask were introduced here: it represents those hardware
         * that has such limits.
         */
        if (hardware_mask && !ir->mask_keycode)
                ir->mask_keycode = hardware_mask;

        /* init input device */
        snprintf(ir->name, sizeof(ir->name), "cx88 IR (%s)", core->board.name);
        snprintf(ir->phys, sizeof(ir->phys), "pci-%s/ir0", pci_name(pci));

        dev->device_name = ir->name;
        dev->input_phys = ir->phys;
        dev->input_id.bustype = BUS_PCI;
        dev->input_id.version = 1;
        if (pci->subsystem_vendor) {
                dev->input_id.vendor = pci->subsystem_vendor;
                dev->input_id.product = pci->subsystem_device;
        } else {
                dev->input_id.vendor = pci->vendor;
                dev->input_id.product = pci->device;
        }
        dev->dev.parent = &pci->dev;
        dev->map_name = ir_codes;
        dev->driver_name = MODULE_NAME;
        dev->priv = core;
        dev->open = cx88_ir_open;
        dev->close = cx88_ir_close;
        dev->scancode_mask = hardware_mask;

        if (ir->sampling) {
                dev->timeout = 10 * 1000 * 1000; /* 10 ms */
        } else {
                dev->driver_type = RC_DRIVER_SCANCODE;
                dev->allowed_protocols = rc_proto;
        }

        ir->core = core;
        core->ir = ir;

        /* all done */
        err = rc_register_device(dev);
        if (err)
                goto err_out_free;

        return 0;

err_out_free:
        rc_free_device(dev);
        core->ir = NULL;
        kfree(ir);
        return err;
}

int cx88_ir_fini(struct cx88_core *core)
{
        struct cx88_IR *ir = core->ir;

        /* skip detach on non attached boards */
        if (!ir)
                return 0;

        cx88_ir_stop(core);
        rc_unregister_device(ir->dev);
        kfree(ir);

        /* done */
        core->ir = NULL;
        return 0;
}

/* ---------------------------------------------------------------------- */

void cx88_ir_irq(struct cx88_core *core)
{
        struct cx88_IR *ir = core->ir;
        u32 samples;
        unsigned int todo, bits;
        struct ir_raw_event ev;

        if (!ir || !ir->sampling)
                return;

        /*
         * Samples are stored in a 32 bit register, oldest sample in
         * the msb. A set bit represents space and an unset bit
         * represents a pulse.
         */
        samples = cx_read(MO_SAMPLE_IO);

        if (samples == 0xff && ir->dev->idle)
                return;

        init_ir_raw_event(&ev);
        for (todo = 32; todo > 0; todo -= bits) {
                ev.pulse = samples & 0x80000000 ? false : true;
                bits = min(todo, 32U - fls(ev.pulse ? samples : ~samples));
                ev.duration = (bits * (NSEC_PER_SEC / 1000)) / ir_samplerate;
                ir_raw_event_store_with_filter(ir->dev, &ev);
                samples <<= bits;
        }
        ir_raw_event_handle(ir->dev);
}

static int get_key_pvr2000(struct IR_i2c *ir, enum rc_proto *protocol,
                           u32 *scancode, u8 *toggle)
{
        int flags, code;

        /* poll IR chip */
        flags = i2c_smbus_read_byte_data(ir->c, 0x10);
        if (flags < 0) {
                dprintk("read error\n");
                return 0;
        }
        /* key pressed ? */
        if (0 == (flags & 0x80))
                return 0;

        /* read actual key code */
        code = i2c_smbus_read_byte_data(ir->c, 0x00);
        if (code < 0) {
                dprintk("read error\n");
                return 0;
        }

        dprintk("IR Key/Flags: (0x%02x/0x%02x)\n",
                code & 0xff, flags & 0xff);

        *protocol = RC_PROTO_UNKNOWN;
        *scancode = code & 0xff;
        *toggle = 0;
        return 1;
}

void cx88_i2c_init_ir(struct cx88_core *core)
{
        struct i2c_board_info info;
        static const unsigned short default_addr_list[] = {
                0x18, 0x6b, 0x71,
                I2C_CLIENT_END
        };
        static const unsigned short pvr2000_addr_list[] = {
                0x18, 0x1a,
                I2C_CLIENT_END
        };
        const unsigned short *addr_list = default_addr_list;
        const unsigned short *addrp;
        /* Instantiate the IR receiver device, if present */
        if (core->i2c_rc != 0)
                return;

        memset(&info, 0, sizeof(struct i2c_board_info));
        strlcpy(info.type, "ir_video", I2C_NAME_SIZE);

        switch (core->boardnr) {
        case CX88_BOARD_LEADTEK_PVR2000:
                addr_list = pvr2000_addr_list;
                core->init_data.name = "cx88 Leadtek PVR 2000 remote";
                core->init_data.type = RC_PROTO_BIT_UNKNOWN;
                core->init_data.get_key = get_key_pvr2000;
                core->init_data.ir_codes = RC_MAP_EMPTY;
                break;
        }

        /*
         * We can't call i2c_new_probed_device() because it uses
         * quick writes for probing and at least some RC receiver
         * devices only reply to reads.
         * Also, Hauppauge XVR needs to be specified, as address 0x71
         * conflicts with another remote type used with saa7134
         */
        for (addrp = addr_list; *addrp != I2C_CLIENT_END; addrp++) {
                info.platform_data = NULL;
                memset(&core->init_data, 0, sizeof(core->init_data));

                if (*addrp == 0x71) {
                        /* Hauppauge XVR */
                        core->init_data.name = "cx88 Hauppauge XVR remote";
                        core->init_data.ir_codes = RC_MAP_HAUPPAUGE;
                        core->init_data.type = RC_PROTO_BIT_RC5 |
                                RC_PROTO_BIT_RC6_MCE | RC_PROTO_BIT_RC6_6A_32;
                        core->init_data.internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;

                        info.platform_data = &core->init_data;
                }
                if (i2c_smbus_xfer(&core->i2c_adap, *addrp, 0,
                                   I2C_SMBUS_READ, 0,
                                   I2C_SMBUS_QUICK, NULL) >= 0) {
                        info.addr = *addrp;
                        i2c_new_device(&core->i2c_adap, &info);
                        break;
                }
        }
}

/* ---------------------------------------------------------------------- */

MODULE_AUTHOR("Gerd Knorr, Pavel Machek, Chris Pascoe");
MODULE_DESCRIPTION("input driver for cx88 GPIO-based IR remote controls");
MODULE_LICENSE("GPL");