hp accelerometer: add freefall detection
[deliverable/linux.git] / drivers / hwmon / hp_accel.c
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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
9e1c9d86 6 * Copyright (C) 2008-2009 Pavel Machek
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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>
9e0c7978 39#include <linux/leds.h>
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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
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47/* Delayed LEDs infrastructure ------------------------------------ */
48
49/* Special LED class that can defer work */
50struct delayed_led_classdev {
51 struct led_classdev led_classdev;
52 struct work_struct work;
53 enum led_brightness new_brightness;
54
55 unsigned int led; /* For driver */
56 void (*set_brightness)(struct delayed_led_classdev *data, enum led_brightness value);
57};
58
59static inline void delayed_set_status_worker(struct work_struct *work)
60{
61 struct delayed_led_classdev *data =
62 container_of(work, struct delayed_led_classdev, work);
63
64 data->set_brightness(data, data->new_brightness);
65}
66
67static inline void delayed_sysfs_set(struct led_classdev *led_cdev,
68 enum led_brightness brightness)
69{
70 struct delayed_led_classdev *data = container_of(led_cdev,
71 struct delayed_led_classdev, led_classdev);
72 data->new_brightness = brightness;
73 schedule_work(&data->work);
74}
75
76/* HP-specific accelerometer driver ------------------------------------ */
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77
78/* For automatic insertion of the module */
79static struct acpi_device_id lis3lv02d_device_ids[] = {
80 {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
81 {"", 0},
82};
83MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
84
85
86/**
87 * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
88 * @handle: the handle of the device
89 *
90 * Returns AE_OK on success.
91 */
92acpi_status lis3lv02d_acpi_init(acpi_handle handle)
93{
94 return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
95}
96
97/**
98 * lis3lv02d_acpi_read - ACPI ALRD method: read a register
99 * @handle: the handle of the device
100 * @reg: the register to read
101 * @ret: result of the operation
102 *
103 * Returns AE_OK on success.
104 */
105acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
106{
107 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
108 struct acpi_object_list args = { 1, &arg0 };
109 unsigned long long lret;
110 acpi_status status;
111
112 arg0.integer.value = reg;
113
114 status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
115 *ret = lret;
116 return status;
117}
118
119/**
120 * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
121 * @handle: the handle of the device
122 * @reg: the register to write to
123 * @val: the value to write
124 *
125 * Returns AE_OK on success.
126 */
127acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
128{
129 unsigned long long ret; /* Not used when writting */
130 union acpi_object in_obj[2];
131 struct acpi_object_list args = { 2, in_obj };
132
133 in_obj[0].type = ACPI_TYPE_INTEGER;
134 in_obj[0].integer.value = reg;
135 in_obj[1].type = ACPI_TYPE_INTEGER;
136 in_obj[1].integer.value = val;
137
138 return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
139}
140
141static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
142{
143 adev.ac = *((struct axis_conversion *)dmi->driver_data);
144 printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
145
146 return 1;
147}
148
149/* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
150 * If the value is negative, the opposite of the hw value is used. */
151static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
152static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
153static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
154static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
155static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
80eda5fb 156static struct axis_conversion lis3lv02d_axis_xy_rotated_left_usd = {-2, 1, -3};
cfce41a6 157static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
6bfef2b3 158static struct axis_conversion lis3lv02d_axis_xy_rotated_right = {2, -1, 3};
87357d27 159static struct axis_conversion lis3lv02d_axis_xy_swap_yz_inverted = {2, -1, -3};
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160
161#define AXIS_DMI_MATCH(_ident, _name, _axis) { \
162 .ident = _ident, \
163 .callback = lis3lv02d_dmi_matched, \
164 .matches = { \
165 DMI_MATCH(DMI_PRODUCT_NAME, _name) \
166 }, \
167 .driver_data = &lis3lv02d_axis_##_axis \
168}
169static struct dmi_system_id lis3lv02d_dmi_ids[] = {
170 /* product names are truncated to match all kinds of a same model */
171 AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
172 AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
173 AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
174 AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
175 AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
176 AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
177 AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
80eda5fb 178 AXIS_DMI_MATCH("NC653x", "HP Compaq 653", xy_rotated_left_usd),
c77a022d 179 AXIS_DMI_MATCH("NC673x", "HP Compaq 673", xy_rotated_left_usd),
6bfef2b3 180 AXIS_DMI_MATCH("NC651xx", "HP Compaq 651", xy_rotated_right),
87357d27 181 AXIS_DMI_MATCH("NC671xx", "HP Compaq 671", xy_swap_yz_inverted),
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182 { NULL, }
183/* Laptop models without axis info (yet):
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184 * "NC6910" "HP Compaq 6910"
185 * HP Compaq 8710x Notebook PC / Mobile Workstation
186 * "NC2400" "HP Compaq nc2400"
187 * "NX74x0" "HP Compaq nx74"
188 * "NX6325" "HP Compaq nx6325"
189 * "NC4400" "HP Compaq nc4400"
190 */
191};
192
9e1c9d86 193static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
9e0c7978 194{
9e1c9d86 195 acpi_handle handle = adev.device->handle;
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196 unsigned long long ret; /* Not used when writing */
197 union acpi_object in_obj[1];
198 struct acpi_object_list args = { 1, in_obj };
199
200 in_obj[0].type = ACPI_TYPE_INTEGER;
9e1c9d86 201 in_obj[0].integer.value = !!value;
9e0c7978 202
9e1c9d86 203 acpi_evaluate_integer(handle, "ALED", &args, &ret);
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204}
205
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206static struct delayed_led_classdev hpled_led = {
207 .led_classdev = {
208 .name = "hp::hddprotect",
209 .default_trigger = "none",
210 .brightness_set = delayed_sysfs_set,
211 .flags = LED_CORE_SUSPENDRESUME,
212 },
213 .set_brightness = hpled_set,
9e0c7978 214};
cfce41a6 215
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216static acpi_status
217lis3lv02d_get_resource(struct acpi_resource *resource, void *context)
218{
219 if (resource->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
220 struct acpi_resource_extended_irq *irq;
221 u32 *device_irq = context;
222
223 irq = &resource->data.extended_irq;
224 *device_irq = irq->interrupts[0];
225 }
226
227 return AE_OK;
228}
229
230static void lis3lv02d_enum_resources(struct acpi_device *device)
231{
232 acpi_status status;
233
234 status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
235 lis3lv02d_get_resource, &adev.irq);
236 if (ACPI_FAILURE(status))
237 printk(KERN_DEBUG DRIVER_NAME ": Error getting resources\n");
238}
239
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240static int lis3lv02d_add(struct acpi_device *device)
241{
242 u8 val;
9e0c7978 243 int ret;
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244
245 if (!device)
246 return -EINVAL;
247
248 adev.device = device;
249 adev.init = lis3lv02d_acpi_init;
250 adev.read = lis3lv02d_acpi_read;
251 adev.write = lis3lv02d_acpi_write;
252 strcpy(acpi_device_name(device), DRIVER_NAME);
253 strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
254 device->driver_data = &adev;
255
256 lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
257 if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
258 printk(KERN_ERR DRIVER_NAME
259 ": Accelerometer chip not LIS3LV02D{L,Q}\n");
260 }
261
262 /* If possible use a "standard" axes order */
263 if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
264 printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
265 "using default axes configuration\n");
266 adev.ac = lis3lv02d_axis_normal;
267 }
268
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269 INIT_WORK(&hpled_led.work, delayed_set_status_worker);
270 ret = led_classdev_register(NULL, &hpled_led.led_classdev);
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271 if (ret)
272 return ret;
273
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274 /* obtain IRQ number of our device from ACPI */
275 lis3lv02d_enum_resources(adev.device);
276
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277 ret = lis3lv02d_init_device(&adev);
278 if (ret) {
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279 flush_work(&hpled_led.work);
280 led_classdev_unregister(&hpled_led.led_classdev);
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281 return ret;
282 }
283
284 return ret;
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285}
286
287static int lis3lv02d_remove(struct acpi_device *device, int type)
288{
289 if (!device)
290 return -EINVAL;
291
292 lis3lv02d_joystick_disable();
293 lis3lv02d_poweroff(device->handle);
294
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295 flush_work(&hpled_led.work);
296 led_classdev_unregister(&hpled_led.led_classdev);
9e0c7978 297
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298 return lis3lv02d_remove_fs();
299}
300
301
302#ifdef CONFIG_PM
303static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
304{
305 /* make sure the device is off when we suspend */
306 lis3lv02d_poweroff(device->handle);
307 return 0;
308}
309
310static int lis3lv02d_resume(struct acpi_device *device)
311{
312 /* put back the device in the right state (ACPI might turn it on) */
313 mutex_lock(&adev.lock);
314 if (adev.usage > 0)
315 lis3lv02d_poweron(device->handle);
316 else
317 lis3lv02d_poweroff(device->handle);
318 mutex_unlock(&adev.lock);
319 return 0;
320}
321#else
322#define lis3lv02d_suspend NULL
323#define lis3lv02d_resume NULL
324#endif
325
326/* For the HP MDPS aka 3D Driveguard */
327static struct acpi_driver lis3lv02d_driver = {
328 .name = DRIVER_NAME,
329 .class = ACPI_MDPS_CLASS,
330 .ids = lis3lv02d_device_ids,
331 .ops = {
332 .add = lis3lv02d_add,
333 .remove = lis3lv02d_remove,
334 .suspend = lis3lv02d_suspend,
335 .resume = lis3lv02d_resume,
336 }
337};
338
339static int __init lis3lv02d_init_module(void)
340{
341 int ret;
342
343 if (acpi_disabled)
344 return -ENODEV;
345
346 ret = acpi_bus_register_driver(&lis3lv02d_driver);
347 if (ret < 0)
348 return ret;
349
350 printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
351
352 return 0;
353}
354
355static void __exit lis3lv02d_exit_module(void)
356{
357 acpi_bus_unregister_driver(&lis3lv02d_driver);
358}
359
9e0c7978 360MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS and support for disk protection LED.");
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361MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
362MODULE_LICENSE("GPL");
363
364module_init(lis3lv02d_init_module);
365module_exit(lis3lv02d_exit_module);
366
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