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};
158 #define AXIS_DMI_MATCH(_ident, _name, _axis) { \
160 .callback = lis3lv02d_dmi_matched, \
162 DMI_MATCH(DMI_PRODUCT_NAME, _name) \
164 .driver_data = &lis3lv02d_axis_##_axis \
166 static struct dmi_system_id lis3lv02d_dmi_ids
[] = {
167 /* product names are truncated to match all kinds of a same model */
168 AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted
),
169 AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted
),
170 AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted
),
171 AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted
),
172 AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted
),
173 AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted
),
174 AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left
),
176 /* Laptop models without axis info (yet):
177 * "NC651xx" "HP Compaq 651"
178 * "NC671xx" "HP Compaq 671"
179 * "NC6910" "HP Compaq 6910"
180 * HP Compaq 8710x Notebook PC / Mobile Workstation
181 * "NC2400" "HP Compaq nc2400"
182 * "NX74x0" "HP Compaq nx74"
183 * "NX6325" "HP Compaq nx6325"
184 * "NC4400" "HP Compaq nc4400"
188 static void hpled_set(struct delayed_led_classdev
*led_cdev
, enum led_brightness value
)
190 acpi_handle handle
= adev
.device
->handle
;
191 unsigned long long ret
; /* Not used when writing */
192 union acpi_object in_obj
[1];
193 struct acpi_object_list args
= { 1, in_obj
};
195 in_obj
[0].type
= ACPI_TYPE_INTEGER
;
196 in_obj
[0].integer
.value
= !!value
;
198 acpi_evaluate_integer(handle
, "ALED", &args
, &ret
);
201 static struct delayed_led_classdev hpled_led
= {
203 .name
= "hp::hddprotect",
204 .default_trigger
= "none",
205 .brightness_set
= delayed_sysfs_set
,
206 .flags
= LED_CORE_SUSPENDRESUME
,
208 .set_brightness
= hpled_set
,
211 static int lis3lv02d_add(struct acpi_device
*device
)
219 adev
.device
= device
;
220 adev
.init
= lis3lv02d_acpi_init
;
221 adev
.read
= lis3lv02d_acpi_read
;
222 adev
.write
= lis3lv02d_acpi_write
;
223 strcpy(acpi_device_name(device
), DRIVER_NAME
);
224 strcpy(acpi_device_class(device
), ACPI_MDPS_CLASS
);
225 device
->driver_data
= &adev
;
227 lis3lv02d_acpi_read(device
->handle
, WHO_AM_I
, &val
);
228 if ((val
!= LIS3LV02DL_ID
) && (val
!= LIS302DL_ID
)) {
229 printk(KERN_ERR DRIVER_NAME
230 ": Accelerometer chip not LIS3LV02D{L,Q}\n");
233 /* If possible use a "standard" axes order */
234 if (dmi_check_system(lis3lv02d_dmi_ids
) == 0) {
235 printk(KERN_INFO DRIVER_NAME
": laptop model unknown, "
236 "using default axes configuration\n");
237 adev
.ac
= lis3lv02d_axis_normal
;
240 INIT_WORK(&hpled_led
.work
, delayed_set_status_worker
);
241 ret
= led_classdev_register(NULL
, &hpled_led
.led_classdev
);
245 ret
= lis3lv02d_init_device(&adev
);
247 flush_work(&hpled_led
.work
);
248 led_classdev_unregister(&hpled_led
.led_classdev
);
255 static int lis3lv02d_remove(struct acpi_device
*device
, int type
)
260 lis3lv02d_joystick_disable();
261 lis3lv02d_poweroff(device
->handle
);
263 flush_work(&hpled_led
.work
);
264 led_classdev_unregister(&hpled_led
.led_classdev
);
266 return lis3lv02d_remove_fs();
271 static int lis3lv02d_suspend(struct acpi_device
*device
, pm_message_t state
)
273 /* make sure the device is off when we suspend */
274 lis3lv02d_poweroff(device
->handle
);
278 static int lis3lv02d_resume(struct acpi_device
*device
)
280 /* put back the device in the right state (ACPI might turn it on) */
281 mutex_lock(&adev
.lock
);
283 lis3lv02d_poweron(device
->handle
);
285 lis3lv02d_poweroff(device
->handle
);
286 mutex_unlock(&adev
.lock
);
290 #define lis3lv02d_suspend NULL
291 #define lis3lv02d_resume NULL
294 /* For the HP MDPS aka 3D Driveguard */
295 static struct acpi_driver lis3lv02d_driver
= {
297 .class = ACPI_MDPS_CLASS
,
298 .ids
= lis3lv02d_device_ids
,
300 .add
= lis3lv02d_add
,
301 .remove
= lis3lv02d_remove
,
302 .suspend
= lis3lv02d_suspend
,
303 .resume
= lis3lv02d_resume
,
307 static int __init
lis3lv02d_init_module(void)
314 ret
= acpi_bus_register_driver(&lis3lv02d_driver
);
318 printk(KERN_INFO DRIVER_NAME
" driver loaded.\n");
323 static void __exit
lis3lv02d_exit_module(void)
325 acpi_bus_unregister_driver(&lis3lv02d_driver
);
328 MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS and support for disk protection LED.");
329 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
330 MODULE_LICENSE("GPL");
332 module_init(lis3lv02d_init_module
);
333 module_exit(lis3lv02d_exit_module
);