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Eric Pielcfce41a2009-01-09 16:41:01 -08001/*
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
Pavel Machek9e1c9d82009-01-15 13:51:24 -08006 * Copyright (C) 2008-2009 Pavel Machek
Eric Pielcfce41a2009-01-09 16:41:01 -08007 *
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>
Eric Piel9e0c7972009-01-15 13:51:23 -080039#include <linux/leds.h>
Eric Pielcfce41a2009-01-09 16:41:01 -080040#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
Pavel Machek9e1c9d82009-01-15 13:51:24 -080047/* 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 ------------------------------------ */
Eric Pielcfce41a2009-01-09 16:41:01 -080077
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};
Eric Piel80eda5f2009-02-04 15:12:11 -0800156static struct axis_conversion lis3lv02d_axis_xy_rotated_left_usd = {-2, 1, -3};
Eric Pielcfce41a2009-01-09 16:41:01 -0800157static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
Jiri Tersel6bfef2b2009-02-04 15:12:09 -0800158static struct axis_conversion lis3lv02d_axis_xy_rotated_right = {2, -1, 3};
Eric Pielcfce41a2009-01-09 16:41:01 -0800159
160#define AXIS_DMI_MATCH(_ident, _name, _axis) { \
161 .ident = _ident, \
162 .callback = lis3lv02d_dmi_matched, \
163 .matches = { \
164 DMI_MATCH(DMI_PRODUCT_NAME, _name) \
165 }, \
166 .driver_data = &lis3lv02d_axis_##_axis \
167}
168static struct dmi_system_id lis3lv02d_dmi_ids[] = {
169 /* product names are truncated to match all kinds of a same model */
170 AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
171 AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
172 AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
173 AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
174 AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
175 AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
176 AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
Eric Piel80eda5f2009-02-04 15:12:11 -0800177 AXIS_DMI_MATCH("NC653x", "HP Compaq 653", xy_rotated_left_usd),
Jiri Tersel6bfef2b2009-02-04 15:12:09 -0800178 AXIS_DMI_MATCH("NC651xx", "HP Compaq 651", xy_rotated_right),
Eric Pielcfce41a2009-01-09 16:41:01 -0800179 { NULL, }
180/* Laptop models without axis info (yet):
Eric Pielcfce41a2009-01-09 16:41:01 -0800181 * "NC671xx" "HP Compaq 671"
182 * "NC6910" "HP Compaq 6910"
183 * HP Compaq 8710x Notebook PC / Mobile Workstation
184 * "NC2400" "HP Compaq nc2400"
185 * "NX74x0" "HP Compaq nx74"
186 * "NX6325" "HP Compaq nx6325"
187 * "NC4400" "HP Compaq nc4400"
188 */
189};
190
Pavel Machek9e1c9d82009-01-15 13:51:24 -0800191static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
Eric Piel9e0c7972009-01-15 13:51:23 -0800192{
Pavel Machek9e1c9d82009-01-15 13:51:24 -0800193 acpi_handle handle = adev.device->handle;
Eric Piel9e0c7972009-01-15 13:51:23 -0800194 unsigned long long ret; /* Not used when writing */
195 union acpi_object in_obj[1];
196 struct acpi_object_list args = { 1, in_obj };
197
198 in_obj[0].type = ACPI_TYPE_INTEGER;
Pavel Machek9e1c9d82009-01-15 13:51:24 -0800199 in_obj[0].integer.value = !!value;
Eric Piel9e0c7972009-01-15 13:51:23 -0800200
Pavel Machek9e1c9d82009-01-15 13:51:24 -0800201 acpi_evaluate_integer(handle, "ALED", &args, &ret);
Eric Piel9e0c7972009-01-15 13:51:23 -0800202}
203
Pavel Machek9e1c9d82009-01-15 13:51:24 -0800204static struct delayed_led_classdev hpled_led = {
205 .led_classdev = {
206 .name = "hp::hddprotect",
207 .default_trigger = "none",
208 .brightness_set = delayed_sysfs_set,
209 .flags = LED_CORE_SUSPENDRESUME,
210 },
211 .set_brightness = hpled_set,
Eric Piel9e0c7972009-01-15 13:51:23 -0800212};
Eric Pielcfce41a2009-01-09 16:41:01 -0800213
214static int lis3lv02d_add(struct acpi_device *device)
215{
216 u8 val;
Eric Piel9e0c7972009-01-15 13:51:23 -0800217 int ret;
Eric Pielcfce41a2009-01-09 16:41:01 -0800218
219 if (!device)
220 return -EINVAL;
221
222 adev.device = device;
223 adev.init = lis3lv02d_acpi_init;
224 adev.read = lis3lv02d_acpi_read;
225 adev.write = lis3lv02d_acpi_write;
226 strcpy(acpi_device_name(device), DRIVER_NAME);
227 strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
228 device->driver_data = &adev;
229
230 lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
231 if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
232 printk(KERN_ERR DRIVER_NAME
233 ": Accelerometer chip not LIS3LV02D{L,Q}\n");
234 }
235
236 /* If possible use a "standard" axes order */
237 if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
238 printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
239 "using default axes configuration\n");
240 adev.ac = lis3lv02d_axis_normal;
241 }
242
Pavel Machek9e1c9d82009-01-15 13:51:24 -0800243 INIT_WORK(&hpled_led.work, delayed_set_status_worker);
244 ret = led_classdev_register(NULL, &hpled_led.led_classdev);
Eric Piel9e0c7972009-01-15 13:51:23 -0800245 if (ret)
246 return ret;
247
248 ret = lis3lv02d_init_device(&adev);
249 if (ret) {
Pavel Machek9e1c9d82009-01-15 13:51:24 -0800250 flush_work(&hpled_led.work);
251 led_classdev_unregister(&hpled_led.led_classdev);
Eric Piel9e0c7972009-01-15 13:51:23 -0800252 return ret;
253 }
254
255 return ret;
Eric Pielcfce41a2009-01-09 16:41:01 -0800256}
257
258static int lis3lv02d_remove(struct acpi_device *device, int type)
259{
260 if (!device)
261 return -EINVAL;
262
263 lis3lv02d_joystick_disable();
264 lis3lv02d_poweroff(device->handle);
265
Pavel Machek9e1c9d82009-01-15 13:51:24 -0800266 flush_work(&hpled_led.work);
267 led_classdev_unregister(&hpled_led.led_classdev);
Eric Piel9e0c7972009-01-15 13:51:23 -0800268
Eric Pielcfce41a2009-01-09 16:41:01 -0800269 return lis3lv02d_remove_fs();
270}
271
272
273#ifdef CONFIG_PM
274static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
275{
276 /* make sure the device is off when we suspend */
277 lis3lv02d_poweroff(device->handle);
278 return 0;
279}
280
281static int lis3lv02d_resume(struct acpi_device *device)
282{
283 /* put back the device in the right state (ACPI might turn it on) */
284 mutex_lock(&adev.lock);
285 if (adev.usage > 0)
286 lis3lv02d_poweron(device->handle);
287 else
288 lis3lv02d_poweroff(device->handle);
289 mutex_unlock(&adev.lock);
290 return 0;
291}
292#else
293#define lis3lv02d_suspend NULL
294#define lis3lv02d_resume NULL
295#endif
296
297/* For the HP MDPS aka 3D Driveguard */
298static struct acpi_driver lis3lv02d_driver = {
299 .name = DRIVER_NAME,
300 .class = ACPI_MDPS_CLASS,
301 .ids = lis3lv02d_device_ids,
302 .ops = {
303 .add = lis3lv02d_add,
304 .remove = lis3lv02d_remove,
305 .suspend = lis3lv02d_suspend,
306 .resume = lis3lv02d_resume,
307 }
308};
309
310static int __init lis3lv02d_init_module(void)
311{
312 int ret;
313
314 if (acpi_disabled)
315 return -ENODEV;
316
317 ret = acpi_bus_register_driver(&lis3lv02d_driver);
318 if (ret < 0)
319 return ret;
320
321 printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
322
323 return 0;
324}
325
326static void __exit lis3lv02d_exit_module(void)
327{
328 acpi_bus_unregister_driver(&lis3lv02d_driver);
329}
330
Eric Piel9e0c7972009-01-15 13:51:23 -0800331MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS and support for disk protection LED.");
Eric Pielcfce41a2009-01-09 16:41:01 -0800332MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
333MODULE_LICENSE("GPL");
334
335module_init(lis3lv02d_init_module);
336module_exit(lis3lv02d_exit_module);
337