drivers/platform/x86/hp_accel.c

   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 */
  48 struct 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
  57 static 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
  65 static 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 */
  77 static struct acpi_device_id lis3lv02d_device_ids[] = {
  78         {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
  79         {"", 0},
  80 };
  81 MODULE_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  */
  90 int 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  */
 108 int 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  */
 131 int 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
 149 static 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 } }
 162 DEFINE_CONV(normal, 1, 2, 3);
 163 DEFINE_CONV(y_inverted, 1, -2, 3);
 164 DEFINE_CONV(x_inverted, -1, 2, 3);
 165 DEFINE_CONV(z_inverted, 1, 2, -3);
 166 DEFINE_CONV(xy_swap, 2, 1, 3);
 167 DEFINE_CONV(xy_rotated_left, -2, 1, 3);
 168 DEFINE_CONV(xy_rotated_left_usd, -2, 1, -3);
 169 DEFINE_CONV(xy_swap_inverted, -2, -1, 3);
 170 DEFINE_CONV(xy_rotated_right, 2, -1, 3);
 171 DEFINE_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 }
 193 static 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         AXIS_DMI_MATCH("NC854xx", "HP EliteBook 854", y_inverted),
 213         AXIS_DMI_MATCH("NC273xx", "HP EliteBook 273", y_inverted),
 214         /* Intel-based HP Pavilion dv5 */
 215         AXIS_DMI_MATCH2("HPDV5_I",
 216                         PRODUCT_NAME, "HP Pavilion dv5",
 217                         BOARD_NAME, "3603",
 218                         x_inverted),
 219         /* AMD-based HP Pavilion dv5 */
 220         AXIS_DMI_MATCH2("HPDV5_A",
 221                         PRODUCT_NAME, "HP Pavilion dv5",
 222                         BOARD_NAME, "3600",
 223                         y_inverted),
 224         AXIS_DMI_MATCH("DV7", "HP Pavilion dv7", x_inverted),
 225         AXIS_DMI_MATCH("HP8710", "HP Compaq 8710", y_inverted),
 226         AXIS_DMI_MATCH("HDX18", "HP HDX 18", x_inverted),
 227         AXIS_DMI_MATCH("HPB432x", "HP ProBook 432", xy_rotated_left),
 228         AXIS_DMI_MATCH("HPB442x", "HP ProBook 442", xy_rotated_left),
 229         AXIS_DMI_MATCH("HPB452x", "HP ProBook 452", y_inverted),
 230         AXIS_DMI_MATCH("HPB522x", "HP ProBook 522", xy_swap),
 231         AXIS_DMI_MATCH("HPB532x", "HP ProBook 532", y_inverted),
 232         AXIS_DMI_MATCH("HPB655x", "HP ProBook 655", xy_swap_inverted),
 233         AXIS_DMI_MATCH("Mini510x", "HP Mini 510", xy_rotated_left_usd),
 234         { NULL, }
 235 /* Laptop models without axis info (yet):
 236  * "NC6910" "HP Compaq 6910"
 237  * "NC2400" "HP Compaq nc2400"
 238  * "NX74x0" "HP Compaq nx74"
 239  * "NX6325" "HP Compaq nx6325"
 240  * "NC4400" "HP Compaq nc4400"
 241  */
 242 };
 243
 244 static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
 245 {
 246         struct acpi_device *dev = lis3_dev.bus_priv;
 247         unsigned long long ret; /* Not used when writing */
 248         union acpi_object in_obj[1];
 249         struct acpi_object_list args = { 1, in_obj };
 250
 251         in_obj[0].type          = ACPI_TYPE_INTEGER;
 252         in_obj[0].integer.value = !!value;
 253
 254         acpi_evaluate_integer(dev->handle, "ALED", &args, &ret);
 255 }
 256
 257 static struct delayed_led_classdev hpled_led = {
 258         .led_classdev = {
 259                 .name                   = "hp::hddprotect",
 260                 .default_trigger        = "none",
 261                 .brightness_set         = delayed_sysfs_set,
 262                 .flags                  = LED_CORE_SUSPENDRESUME,
 263         },
 264         .set_brightness = hpled_set,
 265 };
 266
 267 static acpi_status
 268 lis3lv02d_get_resource(struct acpi_resource *resource, void *context)
 269 {
 270         if (resource->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
 271                 struct acpi_resource_extended_irq *irq;
 272                 u32 *device_irq = context;
 273
 274                 irq = &resource->data.extended_irq;
 275                 *device_irq = irq->interrupts[0];
 276         }
 277
 278         return AE_OK;
 279 }
 280
 281 static void lis3lv02d_enum_resources(struct acpi_device *device)
 282 {
 283         acpi_status status;
 284
 285         status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 286                                         lis3lv02d_get_resource, &lis3_dev.irq);
 287         if (ACPI_FAILURE(status))
 288                 printk(KERN_DEBUG DRIVER_NAME ": Error getting resources\n");
 289 }
 290
 291 static int lis3lv02d_add(struct acpi_device *device)
 292 {
 293         int ret;
 294
 295         if (!device)
 296                 return -EINVAL;
 297
 298         lis3_dev.bus_priv = device;
 299         lis3_dev.init = lis3lv02d_acpi_init;
 300         lis3_dev.read = lis3lv02d_acpi_read;
 301         lis3_dev.write = lis3lv02d_acpi_write;
 302         strcpy(acpi_device_name(device), DRIVER_NAME);
 303         strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
 304         device->driver_data = &lis3_dev;
 305
 306         /* obtain IRQ number of our device from ACPI */
 307         lis3lv02d_enum_resources(device);
 308
 309         /* If possible use a "standard" axes order */
 310         if (lis3_dev.ac.x && lis3_dev.ac.y && lis3_dev.ac.z) {
 311                 pr_info("Using custom axes %d,%d,%d\n",
 312                         lis3_dev.ac.x, lis3_dev.ac.y, lis3_dev.ac.z);
 313         } else if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
 314                 pr_info("laptop model unknown, using default axes configuration\n");
 315                 lis3_dev.ac = lis3lv02d_axis_normal;
 316         }
 317
 318         /* call the core layer do its init */
 319         ret = lis3lv02d_init_device(&lis3_dev);
 320         if (ret)
 321                 return ret;
 322
 323         INIT_WORK(&hpled_led.work, delayed_set_status_worker);
 324         ret = led_classdev_register(NULL, &hpled_led.led_classdev);
 325         if (ret) {
 326                 lis3lv02d_joystick_disable(&lis3_dev);
 327                 lis3lv02d_poweroff(&lis3_dev);
 328                 flush_work(&hpled_led.work);
 329                 return ret;
 330         }
 331
 332         return ret;
 333 }
 334
 335 static int lis3lv02d_remove(struct acpi_device *device, int type)
 336 {
 337         if (!device)
 338                 return -EINVAL;
 339
 340         lis3lv02d_joystick_disable(&lis3_dev);
 341         lis3lv02d_poweroff(&lis3_dev);
 342
 343         led_classdev_unregister(&hpled_led.led_classdev);
 344         flush_work(&hpled_led.work);
 345
 346         return lis3lv02d_remove_fs(&lis3_dev);
 347 }
 348
 349
 350 #ifdef CONFIG_PM
 351 static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
 352 {
 353         /* make sure the device is off when we suspend */
 354         lis3lv02d_poweroff(&lis3_dev);
 355         return 0;
 356 }
 357
 358 static int lis3lv02d_resume(struct acpi_device *device)
 359 {
 360         return lis3lv02d_poweron(&lis3_dev);
 361 }
 362 #else
 363 #define lis3lv02d_suspend NULL
 364 #define lis3lv02d_resume NULL
 365 #endif
 366
 367 /* For the HP MDPS aka 3D Driveguard */
 368 static struct acpi_driver lis3lv02d_driver = {
 369         .name  = DRIVER_NAME,
 370         .class = ACPI_MDPS_CLASS,
 371         .ids   = lis3lv02d_device_ids,
 372         .ops = {
 373                 .add     = lis3lv02d_add,
 374                 .remove  = lis3lv02d_remove,
 375                 .suspend = lis3lv02d_suspend,
 376                 .resume  = lis3lv02d_resume,
 377         }
 378 };
 379
 380 static int __init lis3lv02d_init_module(void)
 381 {
 382         int ret;
 383
 384         if (acpi_disabled)
 385                 return -ENODEV;
 386
 387         ret = acpi_bus_register_driver(&lis3lv02d_driver);
 388         if (ret < 0)
 389                 return ret;
 390
 391         pr_info("driver loaded\n");
 392
 393         return 0;
 394 }
 395
 396 static void __exit lis3lv02d_exit_module(void)
 397 {
 398         acpi_bus_unregister_driver(&lis3lv02d_driver);
 399 }
 400
 401 MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS and support for disk protection LED.");
 402 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 403 MODULE_LICENSE("GPL");
 404
 405 module_init(lis3lv02d_init_module);
 406 module_exit(lis3lv02d_exit_module);