drivers/hwmon/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 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 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/dmi.h>
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/input.h>
  31 #include <linux/kthread.h>
  32 #include <linux/semaphore.h>
  33 #include <linux/delay.h>
  34 #include <linux/wait.h>
  35 #include <linux/poll.h>
  36 #include <linux/freezer.h>
  37 #include <linux/version.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/leds.h>
  40 #include <acpi/acpi_drivers.h>
  41 #include <asm/atomic.h>
  42 #include "lis3lv02d.h"
  43
  44 #define DRIVER_NAME     "lis3lv02d"
  45 #define ACPI_MDPS_CLASS "accelerometer"
  46
  47
  48 /* For automatic insertion of the module */
  49 static struct acpi_device_id lis3lv02d_device_ids[] = {
  50         {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
  51         {"", 0},
  52 };
  53 MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
  54
  55
  56 /**
  57  * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
  58  * @handle: the handle of the device
  59  *
  60  * Returns AE_OK on success.
  61  */
  62 acpi_status lis3lv02d_acpi_init(acpi_handle handle)
  63 {
  64         return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
  65 }
  66
  67 /**
  68  * lis3lv02d_acpi_read - ACPI ALRD method: read a register
  69  * @handle: the handle of the device
  70  * @reg:    the register to read
  71  * @ret:    result of the operation
  72  *
  73  * Returns AE_OK on success.
  74  */
  75 acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
  76 {
  77         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
  78         struct acpi_object_list args = { 1, &arg0 };
  79         unsigned long long lret;
  80         acpi_status status;
  81
  82         arg0.integer.value = reg;
  83
  84         status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
  85         *ret = lret;
  86         return status;
  87 }
  88
  89 /**
  90  * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
  91  * @handle: the handle of the device
  92  * @reg:    the register to write to
  93  * @val:    the value to write
  94  *
  95  * Returns AE_OK on success.
  96  */
  97 acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
  98 {
  99         unsigned long long ret; /* Not used when writting */
 100         union acpi_object in_obj[2];
 101         struct acpi_object_list args = { 2, in_obj };
 102
 103         in_obj[0].type          = ACPI_TYPE_INTEGER;
 104         in_obj[0].integer.value = reg;
 105         in_obj[1].type          = ACPI_TYPE_INTEGER;
 106         in_obj[1].integer.value = val;
 107
 108         return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
 109 }
 110
 111 static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
 112 {
 113         adev.ac = *((struct axis_conversion *)dmi->driver_data);
 114         printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
 115
 116         return 1;
 117 }
 118
 119 /* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
 120  * If the value is negative, the opposite of the hw value is used. */
 121 static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
 122 static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
 123 static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
 124 static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
 125 static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
 126 static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
 127
 128 #define AXIS_DMI_MATCH(_ident, _name, _axis) {          \
 129         .ident = _ident,                                \
 130         .callback = lis3lv02d_dmi_matched,              \
 131         .matches = {                                    \
 132                 DMI_MATCH(DMI_PRODUCT_NAME, _name)      \
 133         },                                              \
 134         .driver_data = &lis3lv02d_axis_##_axis          \
 135 }
 136 static struct dmi_system_id lis3lv02d_dmi_ids[] = {
 137         /* product names are truncated to match all kinds of a same model */
 138         AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
 139         AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
 140         AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
 141         AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
 142         AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
 143         AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
 144         AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
 145         { NULL, }
 146 /* Laptop models without axis info (yet):
 147  * "NC651xx" "HP Compaq 651"
 148  * "NC671xx" "HP Compaq 671"
 149  * "NC6910" "HP Compaq 6910"
 150  * HP Compaq 8710x Notebook PC / Mobile Workstation
 151  * "NC2400" "HP Compaq nc2400"
 152  * "NX74x0" "HP Compaq nx74"
 153  * "NX6325" "HP Compaq nx6325"
 154  * "NC4400" "HP Compaq nc4400"
 155  */
 156 };
 157
 158 static acpi_status hpled_acpi_write(acpi_handle handle, int reg)
 159 {
 160         unsigned long long ret; /* Not used when writing */
 161         union acpi_object in_obj[1];
 162         struct acpi_object_list args = { 1, in_obj };
 163
 164         in_obj[0].type          = ACPI_TYPE_INTEGER;
 165         in_obj[0].integer.value = reg;
 166
 167         return acpi_evaluate_integer(handle, "ALED", &args, &ret);
 168 }
 169
 170 static void hpled_set(struct led_classdev *led_cdev,
 171                                enum led_brightness value)
 172 {
 173         hpled_acpi_write(adev.device->handle, !!value);
 174 }
 175
 176 static struct led_classdev hpled_led = {
 177         .name                   = "hp:red:hddprotection",
 178         .default_trigger        = "none",
 179         .brightness_set         = hpled_set,
 180 };
 181
 182 static int lis3lv02d_add(struct acpi_device *device)
 183 {
 184         u8 val;
 185         int ret;
 186
 187         if (!device)
 188                 return -EINVAL;
 189
 190         adev.device = device;
 191         adev.init = lis3lv02d_acpi_init;
 192         adev.read = lis3lv02d_acpi_read;
 193         adev.write = lis3lv02d_acpi_write;
 194         strcpy(acpi_device_name(device), DRIVER_NAME);
 195         strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
 196         device->driver_data = &adev;
 197
 198         lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
 199         if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
 200                 printk(KERN_ERR DRIVER_NAME
 201                                 ": Accelerometer chip not LIS3LV02D{L,Q}\n");
 202         }
 203
 204         /* If possible use a "standard" axes order */
 205         if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
 206                 printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
 207                                  "using default axes configuration\n");
 208                 adev.ac = lis3lv02d_axis_normal;
 209         }
 210
 211         ret = led_classdev_register(NULL, &hpled_led);
 212         if (ret)
 213                 return ret;
 214
 215         ret = lis3lv02d_init_device(&adev);
 216         if (ret) {
 217                 led_classdev_unregister(&hpled_led);
 218                 return ret;
 219         }
 220
 221         return ret;
 222 }
 223
 224 static int lis3lv02d_remove(struct acpi_device *device, int type)
 225 {
 226         if (!device)
 227                 return -EINVAL;
 228
 229         lis3lv02d_joystick_disable();
 230         lis3lv02d_poweroff(device->handle);
 231
 232         led_classdev_unregister(&hpled_led);
 233
 234         return lis3lv02d_remove_fs();
 235 }
 236
 237
 238 #ifdef CONFIG_PM
 239 static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
 240 {
 241         /* make sure the device is off when we suspend */
 242         lis3lv02d_poweroff(device->handle);
 243         led_classdev_suspend(&hpled_led);
 244         return 0;
 245 }
 246
 247 static int lis3lv02d_resume(struct acpi_device *device)
 248 {
 249         /* put back the device in the right state (ACPI might turn it on) */
 250         mutex_lock(&adev.lock);
 251         if (adev.usage > 0)
 252                 lis3lv02d_poweron(device->handle);
 253         else
 254                 lis3lv02d_poweroff(device->handle);
 255         mutex_unlock(&adev.lock);
 256         led_classdev_resume(&hpled_led);
 257         return 0;
 258 }
 259 #else
 260 #define lis3lv02d_suspend NULL
 261 #define lis3lv02d_resume NULL
 262 #endif
 263
 264 /* For the HP MDPS aka 3D Driveguard */
 265 static struct acpi_driver lis3lv02d_driver = {
 266         .name  = DRIVER_NAME,
 267         .class = ACPI_MDPS_CLASS,
 268         .ids   = lis3lv02d_device_ids,
 269         .ops = {
 270                 .add     = lis3lv02d_add,
 271                 .remove  = lis3lv02d_remove,
 272                 .suspend = lis3lv02d_suspend,
 273                 .resume  = lis3lv02d_resume,
 274         }
 275 };
 276
 277 static int __init lis3lv02d_init_module(void)
 278 {
 279         int ret;
 280
 281         if (acpi_disabled)
 282                 return -ENODEV;
 283
 284         ret = acpi_bus_register_driver(&lis3lv02d_driver);
 285         if (ret < 0)
 286                 return ret;
 287
 288         printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
 289
 290         return 0;
 291 }
 292
 293 static void __exit lis3lv02d_exit_module(void)
 294 {
 295         acpi_bus_unregister_driver(&lis3lv02d_driver);
 296 }
 297
 298 MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS and support for disk protection LED.");
 299 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 300 MODULE_LICENSE("GPL");
 301
 302 module_init(lis3lv02d_init_module);
 303 module_exit(lis3lv02d_exit_module);
 304