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 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 <acpi/acpi_drivers.h>
40 #include <asm/atomic.h>
41 #include "lis3lv02d.h"
43 #define DRIVER_NAME "lis3lv02d"
44 #define ACPI_MDPS_CLASS "accelerometer"
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 */
52 MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
56 * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
57 * @handle: the handle of the device
59 * Returns AE_OK on success.
61 acpi_status lis3lv02d_acpi_init(acpi_handle handle)
63 return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
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
72 * Returns AE_OK on success.
74 acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
76 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
77 struct acpi_object_list args = { 1, &arg0 };
78 unsigned long long lret;
81 arg0.integer.value = reg;
83 status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
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
94 * Returns AE_OK on success.
96 acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
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 };
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;
107 return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
110 static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
112 adev.ac = *((struct axis_conversion *)dmi->driver_data);
113 printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
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};
127 #define AXIS_DMI_MATCH(_ident, _name, _axis) { \
129 .callback = lis3lv02d_dmi_matched, \
131 DMI_MATCH(DMI_PRODUCT_NAME, _name) \
133 .driver_data = &lis3lv02d_axis_##_axis \
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),
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"
158 static int lis3lv02d_add(struct acpi_device *device)
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;
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");
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;
186 return lis3lv02d_init_device(&adev);
189 static int lis3lv02d_remove(struct acpi_device *device, int type)
194 lis3lv02d_joystick_disable();
195 lis3lv02d_poweroff(device->handle);
197 return lis3lv02d_remove_fs();
202 static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
204 /* make sure the device is off when we suspend */
205 lis3lv02d_poweroff(device->handle);
209 static int lis3lv02d_resume(struct acpi_device *device)
211 /* put back the device in the right state (ACPI might turn it on) */
212 mutex_lock(&adev.lock);
214 lis3lv02d_poweron(device->handle);
216 lis3lv02d_poweroff(device->handle);
217 mutex_unlock(&adev.lock);
221 #define lis3lv02d_suspend NULL
222 #define lis3lv02d_resume NULL
225 /* For the HP MDPS aka 3D Driveguard */
226 static struct acpi_driver lis3lv02d_driver = {
228 .class = ACPI_MDPS_CLASS,
229 .ids = lis3lv02d_device_ids,
231 .add = lis3lv02d_add,
232 .remove = lis3lv02d_remove,
233 .suspend = lis3lv02d_suspend,
234 .resume = lis3lv02d_resume,
238 static int __init lis3lv02d_init_module(void)
245 ret = acpi_bus_register_driver(&lis3lv02d_driver);
249 printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
254 static void __exit lis3lv02d_exit_module(void)
256 acpi_bus_unregister_driver(&lis3lv02d_driver);
259 MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS");
260 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
261 MODULE_LICENSE("GPL");
263 module_init(lis3lv02d_init_module);
264 module_exit(lis3lv02d_exit_module);