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cfce41a6 EP |
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 | |
6 | * Copyright (C) 2008 Pavel Machek | |
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> | |
39 | #include <acpi/acpi_drivers.h> | |
40 | #include <asm/atomic.h> | |
41 | #include "lis3lv02d.h" | |
42 | ||
43 | #define DRIVER_NAME "lis3lv02d" | |
44 | #define ACPI_MDPS_CLASS "accelerometer" | |
45 | ||
46 | ||
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 */ | |
50 | {"", 0}, | |
51 | }; | |
52 | MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids); | |
53 | ||
54 | ||
55 | /** | |
56 | * lis3lv02d_acpi_init - ACPI _INI method: initialize the device. | |
57 | * @handle: the handle of the device | |
58 | * | |
59 | * Returns AE_OK on success. | |
60 | */ | |
61 | acpi_status lis3lv02d_acpi_init(acpi_handle handle) | |
62 | { | |
63 | return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL); | |
64 | } | |
65 | ||
66 | /** | |
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 | |
71 | * | |
72 | * Returns AE_OK on success. | |
73 | */ | |
74 | acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret) | |
75 | { | |
76 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
77 | struct acpi_object_list args = { 1, &arg0 }; | |
78 | unsigned long long lret; | |
79 | acpi_status status; | |
80 | ||
81 | arg0.integer.value = reg; | |
82 | ||
83 | status = acpi_evaluate_integer(handle, "ALRD", &args, &lret); | |
84 | *ret = lret; | |
85 | return status; | |
86 | } | |
87 | ||
88 | /** | |
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 | |
93 | * | |
94 | * Returns AE_OK on success. | |
95 | */ | |
96 | acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val) | |
97 | { | |
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 }; | |
101 | ||
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; | |
106 | ||
107 | return acpi_evaluate_integer(handle, "ALWR", &args, &ret); | |
108 | } | |
109 | ||
110 | static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi) | |
111 | { | |
112 | adev.ac = *((struct axis_conversion *)dmi->driver_data); | |
113 | printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident); | |
114 | ||
115 | return 1; | |
116 | } | |
117 | ||
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}; | |
126 | ||
127 | #define AXIS_DMI_MATCH(_ident, _name, _axis) { \ | |
128 | .ident = _ident, \ | |
129 | .callback = lis3lv02d_dmi_matched, \ | |
130 | .matches = { \ | |
131 | DMI_MATCH(DMI_PRODUCT_NAME, _name) \ | |
132 | }, \ | |
133 | .driver_data = &lis3lv02d_axis_##_axis \ | |
134 | } | |
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), | |
144 | { NULL, } | |
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" | |
154 | */ | |
155 | }; | |
156 | ||
157 | ||
158 | static int lis3lv02d_add(struct acpi_device *device) | |
159 | { | |
160 | u8 val; | |
161 | ||
162 | if (!device) | |
163 | return -EINVAL; | |
164 | ||
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; | |
172 | ||
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"); | |
177 | } | |
178 | ||
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; | |
184 | } | |
185 | ||
186 | return lis3lv02d_init_device(&adev); | |
187 | } | |
188 | ||
189 | static int lis3lv02d_remove(struct acpi_device *device, int type) | |
190 | { | |
191 | if (!device) | |
192 | return -EINVAL; | |
193 | ||
194 | lis3lv02d_joystick_disable(); | |
195 | lis3lv02d_poweroff(device->handle); | |
196 | ||
197 | return lis3lv02d_remove_fs(); | |
198 | } | |
199 | ||
200 | ||
201 | #ifdef CONFIG_PM | |
202 | static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state) | |
203 | { | |
204 | /* make sure the device is off when we suspend */ | |
205 | lis3lv02d_poweroff(device->handle); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static int lis3lv02d_resume(struct acpi_device *device) | |
210 | { | |
211 | /* put back the device in the right state (ACPI might turn it on) */ | |
212 | mutex_lock(&adev.lock); | |
213 | if (adev.usage > 0) | |
214 | lis3lv02d_poweron(device->handle); | |
215 | else | |
216 | lis3lv02d_poweroff(device->handle); | |
217 | mutex_unlock(&adev.lock); | |
218 | return 0; | |
219 | } | |
220 | #else | |
221 | #define lis3lv02d_suspend NULL | |
222 | #define lis3lv02d_resume NULL | |
223 | #endif | |
224 | ||
225 | /* For the HP MDPS aka 3D Driveguard */ | |
226 | static struct acpi_driver lis3lv02d_driver = { | |
227 | .name = DRIVER_NAME, | |
228 | .class = ACPI_MDPS_CLASS, | |
229 | .ids = lis3lv02d_device_ids, | |
230 | .ops = { | |
231 | .add = lis3lv02d_add, | |
232 | .remove = lis3lv02d_remove, | |
233 | .suspend = lis3lv02d_suspend, | |
234 | .resume = lis3lv02d_resume, | |
235 | } | |
236 | }; | |
237 | ||
238 | static int __init lis3lv02d_init_module(void) | |
239 | { | |
240 | int ret; | |
241 | ||
242 | if (acpi_disabled) | |
243 | return -ENODEV; | |
244 | ||
245 | ret = acpi_bus_register_driver(&lis3lv02d_driver); | |
246 | if (ret < 0) | |
247 | return ret; | |
248 | ||
249 | printk(KERN_INFO DRIVER_NAME " driver loaded.\n"); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static void __exit lis3lv02d_exit_module(void) | |
255 | { | |
256 | acpi_bus_unregister_driver(&lis3lv02d_driver); | |
257 | } | |
258 | ||
259 | MODULE_DESCRIPTION("Glue between LIS3LV02Dx and HP ACPI BIOS"); | |
260 | MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); | |
261 | MODULE_LICENSE("GPL"); | |
262 | ||
263 | module_init(lis3lv02d_init_module); | |
264 | module_exit(lis3lv02d_exit_module); | |
265 |