LXR linux/drivers/platform/x86/hp

   1/*
   2 *  hp_accel.c - Interface between LIS3LV02DL driver and HP ACPI BIOS
   3 *
   4 *  Copyright (C) 2007-2008 Yan Burman
   5 *  Copyright (C) 2008 Eric Piel
   6 *  Copyright (C) 2008-2009 Pavel Machek
   7 *
   8 *  This program is free software; you can redistribute it and/or modify
   9 *  it under the terms of the GNU General Public License as published by
  10 *  the Free Software Foundation; either version 2 of the License, or
  11 *  (at your option) any later version.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to the Free Software
  20 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25#include <linux/kernel.h>
  26#include <linux/init.h>
  27#include <linux/dmi.h>
  28#include <linux/module.h>
  29#include <linux/types.h>
  30#include <linux/platform_device.h>
  31#include <linux/interrupt.h>
  32#include <linux/delay.h>
  33#include <linux/wait.h>
  34#include <linux/poll.h>
  35#include <linux/freezer.h>
  36#include <linux/uaccess.h>
  37#include <linux/leds.h>
  38#include <linux/atomic.h>
  39#include <acpi/acpi_drivers.h>
  40#include "../../misc/lis3lv02d/lis3lv02d.h"
  41
  42#define DRIVER_NAME     "hp_accel"
  43#define ACPI_MDPS_CLASS "accelerometer"
  44
  45/* Delayed LEDs infrastructure ------------------------------------ */
  46
  47/* Special LED class that can defer work */
  48struct delayed_led_classdev {
  49        struct led_classdev led_classdev;
  50        struct work_struct work;
  51        enum led_brightness new_brightness;
  52
  53        unsigned int led;               /* For driver */
  54        void (*set_brightness)(struct delayed_led_classdev *data, enum led_brightness value);
  55};
  56
  57static inline void delayed_set_status_worker(struct work_struct *work)
  58{
  59        struct delayed_led_classdev *data =
  60                        container_of(work, struct delayed_led_classdev, work);
  61
  62        data->set_brightness(data, data->new_brightness);
  63}
  64
  65static inline void delayed_sysfs_set(struct led_classdev *led_cdev,
  66                              enum led_brightness brightness)
  67{
  68        struct delayed_led_classdev *data = container_of(led_cdev,
  69                             struct delayed_led_classdev, led_classdev);
  70        data->new_brightness = brightness;
  71        schedule_work(&data->work);
  72}
  73
  74/* HP-specific accelerometer driver ------------------------------------ */
  75
  76/* For automatic insertion of the module */
  77static struct acpi_device_id lis3lv02d_device_ids[] = {
  78        {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
  79        {"", 0},
  80};
  81MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
  82
  83
  84/**
  85 * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
  86 * @lis3: pointer to the device struct
  87 *
  88 * Returns 0 on success.
  89 */
  90int lis3lv02d_acpi_init(struct lis3lv02d *lis3)
  91{
  92        struct acpi_device *dev = lis3->bus_priv;
  93        if (acpi_evaluate_object(dev->handle, METHOD_NAME__INI,
  94                                 NULL, NULL) != AE_OK)
  95                return -EINVAL;
  96
  97        return 0;
  98}
  99
 100/**
 101 * lis3lv02d_acpi_read - ACPI ALRD method: read a register
 102 * @lis3: pointer to the device struct
 103 * @reg:    the register to read
 104 * @ret:    result of the operation
 105 *
 106 * Returns 0 on success.
 107 */
 108int lis3lv02d_acpi_read(struct lis3lv02d *lis3, int reg, u8 *ret)
 109{
 110        struct acpi_device *dev = lis3->bus_priv;
 111        union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 112        struct acpi_object_list args = { 1, &arg0 };
 113        unsigned long long lret;
 114        acpi_status status;
 115
 116        arg0.integer.value = reg;
 117
 118        status = acpi_evaluate_integer(dev->handle, "ALRD", &args, &lret);
 119        *ret = lret;
 120        return (status != AE_OK) ? -EINVAL : 0;
 121}
 122
 123/**
 124 * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
 125 * @lis3: pointer to the device struct
 126 * @reg:    the register to write to
 127 * @val:    the value to write
 128 *
 129 * Returns 0 on success.
 130 */
 131int lis3lv02d_acpi_write(struct lis3lv02d *lis3, int reg, u8 val)
 132{
 133        struct acpi_device *dev = lis3->bus_priv;
 134        unsigned long long ret; /* Not used when writting */
 135        union acpi_object in_obj[2];
 136        struct acpi_object_list args = { 2, in_obj };
 137
 138        in_obj[0].type          = ACPI_TYPE_INTEGER;
 139        in_obj[0].integer.value = reg;
 140        in_obj[1].type          = ACPI_TYPE_INTEGER;
 141        in_obj[1].integer.value = val;
 142
 143        if (acpi_evaluate_integer(dev->handle, "ALWR", &args, &ret) != AE_OK)
 144                return -EINVAL;
 145
 146        return 0;
 147}
 148
 149static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
 150{
 151        lis3_dev.ac = *((union axis_conversion *)dmi->driver_data);
 152        pr_info("hardware type %s found\n", dmi->ident);
 153
 154        return 1;
 155}
 156
 157/* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
 158 * If the value is negative, the opposite of the hw value is used. */
 159#define DEFINE_CONV(name, x, y, z)                            \
 160        static union axis_conversion lis3lv02d_axis_##name = \
 161                { .as_array = { x, y, z } }
 162DEFINE_CONV(normal, 1, 2, 3);
 163DEFINE_CONV(y_inverted, 1, -2, 3);
 164DEFINE_CONV(x_inverted, -1, 2, 3);
 165DEFINE_CONV(z_inverted, 1, 2, -3);
 166DEFINE_CONV(xy_swap, 2, 1, 3);
 167DEFINE_CONV(xy_rotated_left, -2, 1, 3);
 168DEFINE_CONV(xy_rotated_left_usd, -2, 1, -3);
 169DEFINE_CONV(xy_swap_inverted, -2, -1, 3);
 170DEFINE_CONV(xy_rotated_right, 2, -1, 3);
 171DEFINE_CONV(xy_swap_yz_inverted, 2, -1, -3);
 172
 173#define AXIS_DMI_MATCH(_ident, _name, _axis) {          \
 174        .ident = _ident,                                \
 175        .callback = lis3lv02d_dmi_matched,              \
 176        .matches = {                                    \
 177                DMI_MATCH(DMI_PRODUCT_NAME, _name)      \
 178        },                                              \
 179        .driver_data = &lis3lv02d_axis_##_axis          \
 180}
 181
 182#define AXIS_DMI_MATCH2(_ident, _class1, _name1,        \
 183                                _class2, _name2,        \
 184                                _axis) {                \
 185        .ident = _ident,                                \
 186        .callback = lis3lv02d_dmi_matched,              \
 187        .matches = {                                    \
 188                DMI_MATCH(DMI_##_class1, _name1),       \
 189                DMI_MATCH(DMI_##_class2, _name2),       \
 190        },                                              \
 191        .driver_data = &lis3lv02d_axis_##_axis          \
 192}
 193static struct dmi_system_id lis3lv02d_dmi_ids[] = {
 194        /* product names are truncated to match all kinds of a same model */
 195        AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
 196        AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
 197        AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
 198        AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
 199        AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
 200        AXIS_DMI_MATCH("NC2710", "HP Compaq 2710", xy_swap),
 201        AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
 202        AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
 203        AXIS_DMI_MATCH("HP2140", "HP 2140", xy_swap_inverted),
 204        AXIS_DMI_MATCH("NC653x", "HP Compaq 653", xy_rotated_left_usd),
 205        AXIS_DMI_MATCH("NC6730b", "HP Compaq 6730b", xy_rotated_left_usd),
 206        AXIS_DMI_MATCH("NC6730s", "HP Compaq 6730s", xy_swap),
 207        AXIS_DMI_MATCH("NC651xx", "HP Compaq 651", xy_rotated_right),
 208        AXIS_DMI_MATCH("NC6710x", "HP Compaq 6710", xy_swap_yz_inverted),
 209        AXIS_DMI_MATCH("NC6715x", "HP Compaq 6715", y_inverted),
 210        AXIS_DMI_MATCH("NC693xx", "HP EliteBook 693", xy_rotated_right),
 211        AXIS_DMI_MATCH("NC693xx", "HP EliteBook 853", xy_swap),
 212        /* Intel-based HP Pavilion dv5 */
 213        AXIS_DMI_MATCH2("HPDV5_I",
 214                        PRODUCT_NAME, "HP Pavilion dv5",
 215                        BOARD_NAME, "3603",
 216                        x_inverted),
 217        /* AMD-based HP Pavilion dv5 */
 218        AXIS_DMI_MATCH2("HPDV5_A",
 219                        PRODUCT_NAME, "HP Pavilion dv5",
 220                        BOARD_NAME, "3600",
 221                        y_inverted),
 222        AXIS_DMI_MATCH("DV7", "HP Pavilion dv7", x_inverted),
 223        AXIS_DMI_MATCH("HP8710", "HP Compaq 8710", y_inverted),
 224        AXIS_DMI_MATCH("HDX18", "HP HDX 18", x_inverted),
 225        AXIS_DMI_MATCH("HPB432x", "HP ProBook 432", xy_rotated_left),
 226        AXIS_DMI_MATCH("HPB442x", "HP ProBook 442", xy_rotated_left),
 227        AXIS_DMI_MATCH("HPB452x", "HP ProBook 452", y_inverted),
 228        AXIS_DMI_MATCH("HPB522x", "HP ProBook 522", xy_swap),
 229        AXIS_DMI_MATCH("HPB532x", "HP ProBook 532", y_inverted),
 230        AXIS_DMI_MATCH("Mini510x", "HP Mini 510", xy_rotated_left_usd),
 231        { NULL, }
 232/* Laptop models without axis info (yet):
 233 * "NC6910" "HP Compaq 6910"
 234 * "NC2400" "HP Compaq nc2400"
 235 * "NX74x0" "HP Compaq nx74"
 236 * "NX6325" "HP Compaq nx6325"
 237 * "NC4400" "HP Compaq nc4400"
 238 */
 239};
 240
 241static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
 242{
 243        struct acpi_device *dev = lis3_dev.bus_priv;
 244        unsigned long long ret; /* Not used when writing */
 245        union acpi_object in_obj[1];
 246        struct acpi_object_list args = { 1, in_obj };
 247
 248        in_obj[0].type          = ACPI_TYPE_INTEGER;
 249        in_obj[0].integer.value = !!value;
 250
 251        acpi_evaluate_integer(dev->handle, "ALED", &args, &ret);
 252}
 253
 254static struct delayed_led_classdev hpled_led = {
 255        .led_classdev = {
 256                .name                   = "hp::hddprotect",
 257                .default_trigger        = "none",
 258                .brightness_set         = delayed_sysfs_set,
 259                .flags                  = LED_CORE_SUSPENDRESUME,
 260        },
 261        .set_brightness = hpled_set,
 262};
 263
 264static acpi_status
 265lis3lv02d_get_resource(struct acpi_resource *resource, void *context)
 266{
 267        if (resource->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
 268                struct acpi_resource_extended_irq *irq;
 269                u32 *device_irq = context;
 270
 271                irq = &resource->data.extended_irq;
 272                *device_irq = irq->interrupts[0];
 273        }
 274
 275        return AE_OK;
 276}
 277
 278static void lis3lv02d_enum_resources(struct acpi_device *device)
 279{
 280        acpi_status status;
 281
 282        status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 283                                        lis3lv02d_get_resource, &lis3_dev.irq);
 284        if (ACPI_FAILURE(status))
 285                printk(KERN_DEBUG DRIVER_NAME ": Error getting resources\n");
 286}
 287
 288static int lis3lv02d_add(struct acpi_device *device)
 289{
 290        int ret;
 291
 292        if (!device)
 293                return -EINVAL;
 294
 295        lis3_dev.bus_priv = device;
 296        lis3_dev.init = lis3lv02d_acpi_init;
 297        lis3_dev.read = lis3lv02d_acpi_read;
 298        lis3_dev.write = lis3lv02d_acpi_write;
 299        strcpy(acpi_device_name(device), DRIVER_NAME);
 300        strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
 301        device->driver_data = &lis3_dev;
 302
 303        /* obtain IRQ number of our device from ACPI */
 304        lis3lv02d_enum_resources(device);
 305
 306        /* If possible use a "standard" axes order */
 307        if (lis3_dev.ac.x && lis3_dev.ac.y && lis3_dev.ac.z) {
 308                pr_info("Using custom axes %d,%d,%d\n",
 309                        lis3_dev.ac.x, lis3_dev.ac.y, lis3_dev.ac.z);
 310        } else if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
 311                pr_info("laptop model unknown, using default axes configuration\n");
 312                lis3_dev.ac = lis3lv02d_axis_normal;
 313        }
 314
 315        /* call the core layer do its init */
 316        ret = lis3lv02d_init_device(&lis3_dev);
 317        if (ret)
 318                return ret;
 319
 320        INIT_WORK(&hpled_led.work, delayed_set_status_worker);
 321        ret = led_classdev_register(NULL, &hpled_led.led_classdev);
 322        if (ret) {
 323                lis3lv02d_joystick_disable();
 324                lis3lv02d_poweroff(&lis3_dev);
 325                flush_work(&hpled_led.work);
 326                return ret;
 327        }
 328
 329        return ret;
 330}
 331
 332static int lis3lv02d_remove(struct acpi_device *device, int type)
 333{
 334        if (!device)
 335                return -EINVAL;
 336
 337        lis3lv02d_joystick_disable();
 338        lis3lv02d_poweroff(&lis3_dev);
 339
 340        led_classdev_unregister(&hpled_led.led_classdev);
 341        flush_work(&hpled_led.work);
 342
 343        return lis3lv02d_remove_fs(&lis3_dev);
 344}
 345
 346
 347#ifdef CONFIG_PM
 348static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
 349{
 350        /* make sure the device is off when we suspend */
 351        lis3lv02d_poweroff(&lis3_dev);
 352        return 0;
 353}
 354
 355static int lis3lv02d_resume(struct acpi_device *device)
 356{
 357        lis3lv02d_poweron(&lis3_dev);
 358        return 0;
 359}
 360#else
 361#define lis3lv02d_suspend NULL
 362#define lis3lv02d_resume NULL
 363#endif
 364
 365/* For the HP MDPS aka 3D Driveguard */
 366static struct acpi_driver lis3lv02d_driver = {
 367        .name  = DRIVER_NAME,
 368        .class = ACPI_MDPS_CLASS,
 369        .ids   = lis3lv02d_device_ids,
 370        .ops = {
 371                .add     = lis3lv02d_add,
 372                .remove  = lis3lv02d_remove,
 373                .suspend = lis3lv02d_suspend,
 374                .resume  = lis3lv02d_resume,
 375        }
 376};
 377
 378static int __init lis3lv02d_init_module(void)
 379{
 380        int ret;
 381
 382        if (acpi_disabled)
 383                return -ENODEV;
 384
 385        ret = acpi_bus_register_driver(&lis3lv02d_driver);
 386        if (ret < 0)
 387                return ret;
 388
 389        pr_info("driver loaded\n");
 390
 391        return 0;
 392}
 393
 394static void __exit lis3lv02d_exit_module(void)
 395{
 396        acpi_bus_unregister_driver(&lis3lv02d_driver);
 397}
 398
 399MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS and support for disk protection LED.");
 400MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 401MODULE_LICENSE("GPL");
 402
 403module_init(lis3lv02d_init_module);
 404module_exit(lis3lv02d_exit_module);
 405