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 <acpi/acpi_drivers.h>
  40 #include <asm/atomic.h>
  41 #include "lis3lv02d.h"
  42
  43 #define DRIVER_NAME     "lis3lv02d"
  44 #define ACPI_MDPS_CLASS "accelerometer"
  45
  46
  47 /* For automatic insertion of the module */
  48 static struct acpi_device_id lis3lv02d_device_ids[] = {
  49         {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
  50         {"", 0},
  51 };
  52 MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
  53
  54
  55 /**
  56  * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
  57  * @handle: the handle of the device
  58  *
  59  * Returns AE_OK on success.
  60  */
  61 acpi_status lis3lv02d_acpi_init(acpi_handle handle)
  62 {
  63         return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
  64 }
  65
  66 /**
  67  * lis3lv02d_acpi_read - ACPI ALRD method: read a register
  68  * @handle: the handle of the device
  69  * @reg:    the register to read
  70  * @ret:    result of the operation
  71  *
  72  * Returns AE_OK on success.
  73  */
  74 acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
  75 {
  76         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
  77         struct acpi_object_list args = { 1, &arg0 };
  78         unsigned long long lret;
  79         acpi_status status;
  80
  81         arg0.integer.value = reg;
  82
  83         status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
  84         *ret = lret;
  85         return status;
  86 }
  87
  88 /**
  89  * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
  90  * @handle: the handle of the device
  91  * @reg:    the register to write to
  92  * @val:    the value to write
  93  *
  94  * Returns AE_OK on success.
  95  */
  96 acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
  97 {
  98         unsigned long long ret; /* Not used when writting */
  99         union acpi_object in_obj[2];
 100         struct acpi_object_list args = { 2, in_obj };
 101
 102         in_obj[0].type          = ACPI_TYPE_INTEGER;
 103         in_obj[0].integer.value = reg;
 104         in_obj[1].type          = ACPI_TYPE_INTEGER;
 105         in_obj[1].integer.value = val;
 106
 107         return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
 108 }
 109
 110 static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
 111 {
 112         adev.ac = *((struct axis_conversion *)dmi->driver_data);
 113         printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
 114
 115         return 1;
 116 }
 117
 118 /* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
 119  * If the value is negative, the opposite of the hw value is used. */
 120 static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
 121 static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
 122 static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
 123 static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
 124 static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
 125 static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
 126
 127 #define AXIS_DMI_MATCH(_ident, _name, _axis) {          \
 128         .ident = _ident,                                \
 129         .callback = lis3lv02d_dmi_matched,              \
 130         .matches = {                                    \
 131                 DMI_MATCH(DMI_PRODUCT_NAME, _name)      \
 132         },                                              \
 133         .driver_data = &lis3lv02d_axis_##_axis          \
 134 }
 135 static struct dmi_system_id lis3lv02d_dmi_ids[] = {
 136         /* product names are truncated to match all kinds of a same model */
 137         AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
 138         AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
 139         AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
 140         AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
 141         AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
 142         AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
 143         AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
 144         { NULL, }
 145 /* Laptop models without axis info (yet):
 146  * "NC651xx" "HP Compaq 651"
 147  * "NC671xx" "HP Compaq 671"
 148  * "NC6910" "HP Compaq 6910"
 149  * HP Compaq 8710x Notebook PC / Mobile Workstation
 150  * "NC2400" "HP Compaq nc2400"
 151  * "NX74x0" "HP Compaq nx74"
 152  * "NX6325" "HP Compaq nx6325"
 153  * "NC4400" "HP Compaq nc4400"
 154  */
 155 };
 156
 157
 158 static int lis3lv02d_add(struct acpi_device *device)
 159 {
 160         u8 val;
 161
 162         if (!device)
 163                 return -EINVAL;
 164
 165         adev.device = device;
 166         adev.init = lis3lv02d_acpi_init;
 167         adev.read = lis3lv02d_acpi_read;
 168         adev.write = lis3lv02d_acpi_write;
 169         strcpy(acpi_device_name(device), DRIVER_NAME);
 170         strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
 171         device->driver_data = &adev;
 172
 173         lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
 174         if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
 175                 printk(KERN_ERR DRIVER_NAME
 176                                 ": Accelerometer chip not LIS3LV02D{L,Q}\n");
 177         }
 178
 179         /* If possible use a "standard" axes order */
 180         if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
 181                 printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
 182                                  "using default axes configuration\n");
 183                 adev.ac = lis3lv02d_axis_normal;
 184         }
 185
 186         return lis3lv02d_init_device(&adev);
 187 }
 188
 189 static int lis3lv02d_remove(struct acpi_device *device, int type)
 190 {
 191         if (!device)
 192                 return -EINVAL;
 193
 194         lis3lv02d_joystick_disable();
 195         lis3lv02d_poweroff(device->handle);
 196
 197         return lis3lv02d_remove_fs();
 198 }
 199
 200
 201 #ifdef CONFIG_PM
 202 static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
 203 {
 204         /* make sure the device is off when we suspend */
 205         lis3lv02d_poweroff(device->handle);
 206         return 0;
 207 }
 208
 209 static int lis3lv02d_resume(struct acpi_device *device)
 210 {
 211         /* put back the device in the right state (ACPI might turn it on) */
 212         mutex_lock(&adev.lock);
 213         if (adev.usage > 0)
 214                 lis3lv02d_poweron(device->handle);
 215         else
 216                 lis3lv02d_poweroff(device->handle);
 217         mutex_unlock(&adev.lock);
 218         return 0;
 219 }
 220 #else
 221 #define lis3lv02d_suspend NULL
 222 #define lis3lv02d_resume NULL
 223 #endif
 224
 225 /* For the HP MDPS aka 3D Driveguard */
 226 static struct acpi_driver lis3lv02d_driver = {
 227         .name  = DRIVER_NAME,
 228         .class = ACPI_MDPS_CLASS,
 229         .ids   = lis3lv02d_device_ids,
 230         .ops = {
 231                 .add     = lis3lv02d_add,
 232                 .remove  = lis3lv02d_remove,
 233                 .suspend = lis3lv02d_suspend,
 234                 .resume  = lis3lv02d_resume,
 235         }
 236 };
 237
 238 static int __init lis3lv02d_init_module(void)
 239 {
 240         int ret;
 241
 242         if (acpi_disabled)
 243                 return -ENODEV;
 244
 245         ret = acpi_bus_register_driver(&lis3lv02d_driver);
 246         if (ret < 0)
 247                 return ret;
 248
 249         printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
 250
 251         return 0;
 252 }
 253
 254 static void __exit lis3lv02d_exit_module(void)
 255 {
 256         acpi_bus_unregister_driver(&lis3lv02d_driver);
 257 }
 258
 259 MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS");
 260 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 261 MODULE_LICENSE("GPL");
 262
 263 module_init(lis3lv02d_init_module);
 264 module_exit(lis3lv02d_exit_module);
 265