2 * hp_accel.c - Interface between LIS3LV02DL driver and HP ACPI BIOS
4 * Copyright (C) 2007-2008 Yan Burman
5 * Copyright (C) 2008 Eric Piel
6 * Copyright (C) 2008-2009 Pavel Machek
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.
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.
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
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"
44 #define DRIVER_NAME "lis3lv02d"
45 #define ACPI_MDPS_CLASS "accelerometer"
47 /* Delayed LEDs infrastructure ------------------------------------ */
49 /* Special LED class that can defer work */
50 struct delayed_led_classdev {
51 struct led_classdev led_classdev;
52 struct work_struct work;
53 enum led_brightness new_brightness;
55 unsigned int led; /* For driver */
56 void (*set_brightness)(struct delayed_led_classdev *data, enum led_brightness value);
59 static inline void delayed_set_status_worker(struct work_struct *work)
61 struct delayed_led_classdev *data =
62 container_of(work, struct delayed_led_classdev, work);
64 data->set_brightness(data, data->new_brightness);
67 static inline void delayed_sysfs_set(struct led_classdev *led_cdev,
68 enum led_brightness brightness)
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);
76 /* HP-specific accelerometer driver ------------------------------------ */
78 /* For automatic insertion of the module */
79 static struct acpi_device_id lis3lv02d_device_ids[] = {
80 {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
83 MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
87 * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
88 * @handle: the handle of the device
90 * Returns AE_OK on success.
92 acpi_status lis3lv02d_acpi_init(acpi_handle handle)
94 return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
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
103 * Returns AE_OK on success.
105 acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
107 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
108 struct acpi_object_list args = { 1, &arg0 };
109 unsigned long long lret;
112 arg0.integer.value = reg;
114 status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
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
125 * Returns AE_OK on success.
127 acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
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 };
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;
138 return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
141 static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
143 adev.ac = *((struct axis_conversion *)dmi->driver_data);
144 printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
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. */
151 static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
152 static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
153 static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
154 static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
155 static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
156 static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
157 static struct axis_conversion lis3lv02d_axis_xy_rotated_right = {2, -1, 3};
159 #define AXIS_DMI_MATCH(_ident, _name, _axis) { \
161 .callback = lis3lv02d_dmi_matched, \
163 DMI_MATCH(DMI_PRODUCT_NAME, _name) \
165 .driver_data = &lis3lv02d_axis_##_axis \
167 static struct dmi_system_id lis3lv02d_dmi_ids[] = {
168 /* product names are truncated to match all kinds of a same model */
169 AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
170 AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
171 AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
172 AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
173 AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
174 AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
175 AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
176 AXIS_DMI_MATCH("NC651xx", "HP Compaq 651", xy_rotated_right),
178 /* Laptop models without axis info (yet):
179 * "NC671xx" "HP Compaq 671"
180 * "NC6910" "HP Compaq 6910"
181 * HP Compaq 8710x Notebook PC / Mobile Workstation
182 * "NC2400" "HP Compaq nc2400"
183 * "NX74x0" "HP Compaq nx74"
184 * "NX6325" "HP Compaq nx6325"
185 * "NC4400" "HP Compaq nc4400"
189 static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
191 acpi_handle handle = adev.device->handle;
192 unsigned long long ret; /* Not used when writing */
193 union acpi_object in_obj[1];
194 struct acpi_object_list args = { 1, in_obj };
196 in_obj[0].type = ACPI_TYPE_INTEGER;
197 in_obj[0].integer.value = !!value;
199 acpi_evaluate_integer(handle, "ALED", &args, &ret);
202 static struct delayed_led_classdev hpled_led = {
204 .name = "hp::hddprotect",
205 .default_trigger = "none",
206 .brightness_set = delayed_sysfs_set,
207 .flags = LED_CORE_SUSPENDRESUME,
209 .set_brightness = hpled_set,
212 static int lis3lv02d_add(struct acpi_device *device)
220 adev.device = device;
221 adev.init = lis3lv02d_acpi_init;
222 adev.read = lis3lv02d_acpi_read;
223 adev.write = lis3lv02d_acpi_write;
224 strcpy(acpi_device_name(device), DRIVER_NAME);
225 strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
226 device->driver_data = &adev;
228 lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
229 if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
230 printk(KERN_ERR DRIVER_NAME
231 ": Accelerometer chip not LIS3LV02D{L,Q}\n");
234 /* If possible use a "standard" axes order */
235 if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
236 printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
237 "using default axes configuration\n");
238 adev.ac = lis3lv02d_axis_normal;
241 INIT_WORK(&hpled_led.work, delayed_set_status_worker);
242 ret = led_classdev_register(NULL, &hpled_led.led_classdev);
246 ret = lis3lv02d_init_device(&adev);
248 flush_work(&hpled_led.work);
249 led_classdev_unregister(&hpled_led.led_classdev);
256 static int lis3lv02d_remove(struct acpi_device *device, int type)
261 lis3lv02d_joystick_disable();
262 lis3lv02d_poweroff(device->handle);
264 flush_work(&hpled_led.work);
265 led_classdev_unregister(&hpled_led.led_classdev);
267 return lis3lv02d_remove_fs();
272 static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
274 /* make sure the device is off when we suspend */
275 lis3lv02d_poweroff(device->handle);
279 static int lis3lv02d_resume(struct acpi_device *device)
281 /* put back the device in the right state (ACPI might turn it on) */
282 mutex_lock(&adev.lock);
284 lis3lv02d_poweron(device->handle);
286 lis3lv02d_poweroff(device->handle);
287 mutex_unlock(&adev.lock);
291 #define lis3lv02d_suspend NULL
292 #define lis3lv02d_resume NULL
295 /* For the HP MDPS aka 3D Driveguard */
296 static struct acpi_driver lis3lv02d_driver = {
298 .class = ACPI_MDPS_CLASS,
299 .ids = lis3lv02d_device_ids,
301 .add = lis3lv02d_add,
302 .remove = lis3lv02d_remove,
303 .suspend = lis3lv02d_suspend,
304 .resume = lis3lv02d_resume,
308 static int __init lis3lv02d_init_module(void)
315 ret = acpi_bus_register_driver(&lis3lv02d_driver);
319 printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
324 static void __exit lis3lv02d_exit_module(void)
326 acpi_bus_unregister_driver(&lis3lv02d_driver);
329 MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS and support for disk protection LED.");
330 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
331 MODULE_LICENSE("GPL");
333 module_init(lis3lv02d_init_module);
334 module_exit(lis3lv02d_exit_module);