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d0482533 JW |
1 | /*-*-linux-c-*-*/ |
2 | ||
3 | /* | |
4 | Copyright (C) 2007 Jonathan Woithe <jwoithe@physics.adelaide.edu.au> | |
5 | Based on earlier work: | |
6 | Copyright (C) 2003 Shane Spencer <shane@bogomip.com> | |
7 | Adrian Yee <brewt-fujitsu@brewt.org> | |
8 | ||
9 | Templated from msi-laptop.c which is copyright by its respective authors. | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2 of the License, or | |
14 | (at your option) any later version. | |
15 | ||
16 | This program is distributed in the hope that it will be useful, but | |
17 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
24 | 02110-1301, USA. | |
25 | */ | |
26 | ||
27 | /* | |
28 | * fujitsu-laptop.c - Fujitsu laptop support, providing access to additional | |
29 | * features made available on a range of Fujitsu laptops including the | |
30 | * P2xxx/P5xxx/S6xxx/S7xxx series. | |
31 | * | |
32 | * This driver exports a few files in /sys/devices/platform/fujitsu-laptop/; | |
33 | * others may be added at a later date. | |
34 | * | |
35 | * lcd_level - Screen brightness: contains a single integer in the | |
36 | * range 0..7. (rw) | |
37 | * | |
38 | * In addition to these platform device attributes the driver | |
39 | * registers itself in the Linux backlight control subsystem and is | |
40 | * available to userspace under /sys/class/backlight/fujitsu-laptop/. | |
41 | * | |
42 | * This driver has been tested on a Fujitsu Lifebook S7020. It should | |
43 | * work on most P-series and S-series Lifebooks, but YMMV. | |
44 | */ | |
45 | ||
46 | #include <linux/module.h> | |
47 | #include <linux/kernel.h> | |
48 | #include <linux/init.h> | |
49 | #include <linux/acpi.h> | |
50 | #include <linux/dmi.h> | |
51 | #include <linux/backlight.h> | |
52 | #include <linux/platform_device.h> | |
d0482533 JW |
53 | |
54 | #define FUJITSU_DRIVER_VERSION "0.3" | |
55 | ||
56 | #define FUJITSU_LCD_N_LEVELS 8 | |
57 | ||
58 | #define ACPI_FUJITSU_CLASS "fujitsu" | |
59 | #define ACPI_FUJITSU_HID "FUJ02B1" | |
60 | #define ACPI_FUJITSU_DRIVER_NAME "Fujitsu laptop FUJ02B1 ACPI extras driver" | |
61 | #define ACPI_FUJITSU_DEVICE_NAME "Fujitsu FUJ02B1" | |
62 | ||
63 | struct fujitsu_t { | |
64 | acpi_handle acpi_handle; | |
65 | struct backlight_device *bl_device; | |
66 | struct platform_device *pf_device; | |
67 | ||
68 | unsigned long fuj02b1_state; | |
69 | unsigned int brightness_changed; | |
70 | unsigned int brightness_level; | |
71 | }; | |
72 | ||
73 | static struct fujitsu_t *fujitsu; | |
74 | ||
75 | /* Hardware access */ | |
76 | ||
77 | static int set_lcd_level(int level) | |
78 | { | |
79 | acpi_status status = AE_OK; | |
80 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
81 | struct acpi_object_list arg_list = { 1, &arg0 }; | |
82 | acpi_handle handle = NULL; | |
83 | ||
84 | if (level < 0 || level >= FUJITSU_LCD_N_LEVELS) | |
85 | return -EINVAL; | |
86 | ||
87 | if (!fujitsu) | |
88 | return -EINVAL; | |
89 | ||
90 | status = acpi_get_handle(fujitsu->acpi_handle, "SBLL", &handle); | |
91 | if (ACPI_FAILURE(status)) { | |
92 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "SBLL not present\n")); | |
93 | return -ENODEV; | |
94 | } | |
95 | ||
96 | arg0.integer.value = level; | |
97 | ||
98 | status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); | |
99 | if (ACPI_FAILURE(status)) | |
100 | return -ENODEV; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int get_lcd_level(void) | |
106 | { | |
107 | unsigned long state = 0; | |
108 | acpi_status status = AE_OK; | |
109 | ||
110 | // Get the Brightness | |
111 | status = | |
112 | acpi_evaluate_integer(fujitsu->acpi_handle, "GBLL", NULL, &state); | |
113 | if (status < 0) | |
114 | return status; | |
115 | ||
116 | fujitsu->fuj02b1_state = state; | |
117 | fujitsu->brightness_level = state & 0x0fffffff; | |
118 | ||
119 | if (state & 0x80000000) | |
120 | fujitsu->brightness_changed = 1; | |
121 | else | |
122 | fujitsu->brightness_changed = 0; | |
123 | ||
d0482533 JW |
124 | return fujitsu->brightness_level; |
125 | } | |
126 | ||
127 | /* Backlight device stuff */ | |
128 | ||
129 | static int bl_get_brightness(struct backlight_device *b) | |
130 | { | |
131 | return get_lcd_level(); | |
132 | } | |
133 | ||
134 | static int bl_update_status(struct backlight_device *b) | |
135 | { | |
136 | return set_lcd_level(b->props.brightness); | |
137 | } | |
138 | ||
139 | static struct backlight_ops fujitsubl_ops = { | |
140 | .get_brightness = bl_get_brightness, | |
141 | .update_status = bl_update_status, | |
142 | }; | |
143 | ||
144 | /* Platform device */ | |
145 | ||
146 | static ssize_t show_lcd_level(struct device *dev, | |
147 | struct device_attribute *attr, char *buf) | |
148 | { | |
149 | ||
150 | int ret; | |
151 | ||
152 | ret = get_lcd_level(); | |
153 | if (ret < 0) | |
154 | return ret; | |
155 | ||
156 | return sprintf(buf, "%i\n", ret); | |
157 | } | |
158 | ||
159 | static ssize_t store_lcd_level(struct device *dev, | |
160 | struct device_attribute *attr, const char *buf, | |
161 | size_t count) | |
162 | { | |
163 | ||
164 | int level, ret; | |
165 | ||
166 | if (sscanf(buf, "%i", &level) != 1 | |
167 | || (level < 0 || level >= FUJITSU_LCD_N_LEVELS)) | |
168 | return -EINVAL; | |
169 | ||
170 | ret = set_lcd_level(level); | |
171 | if (ret < 0) | |
172 | return ret; | |
173 | ||
174 | return count; | |
175 | } | |
176 | ||
177 | static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level); | |
178 | ||
179 | static struct attribute *fujitsupf_attributes[] = { | |
180 | &dev_attr_lcd_level.attr, | |
181 | NULL | |
182 | }; | |
183 | ||
184 | static struct attribute_group fujitsupf_attribute_group = { | |
185 | .attrs = fujitsupf_attributes | |
186 | }; | |
187 | ||
188 | static struct platform_driver fujitsupf_driver = { | |
189 | .driver = { | |
190 | .name = "fujitsu-laptop", | |
191 | .owner = THIS_MODULE, | |
192 | } | |
193 | }; | |
194 | ||
195 | /* ACPI device */ | |
196 | ||
b6f03ae6 | 197 | static int acpi_fujitsu_add(struct acpi_device *device) |
d0482533 JW |
198 | { |
199 | int result = 0; | |
200 | int state = 0; | |
201 | ||
202 | ACPI_FUNCTION_TRACE("acpi_fujitsu_add"); | |
203 | ||
204 | if (!device) | |
205 | return -EINVAL; | |
206 | ||
207 | fujitsu->acpi_handle = device->handle; | |
208 | sprintf(acpi_device_name(device), "%s", ACPI_FUJITSU_DEVICE_NAME); | |
209 | sprintf(acpi_device_class(device), "%s", ACPI_FUJITSU_CLASS); | |
210 | acpi_driver_data(device) = fujitsu; | |
211 | ||
212 | result = acpi_bus_get_power(fujitsu->acpi_handle, &state); | |
213 | if (result) { | |
214 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
215 | "Error reading power state\n")); | |
216 | goto end; | |
217 | } | |
218 | ||
219 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
220 | acpi_device_name(device), acpi_device_bid(device), | |
221 | !device->power.state ? "on" : "off"); | |
222 | ||
223 | end: | |
224 | ||
225 | return result; | |
226 | } | |
227 | ||
b6f03ae6 | 228 | static int acpi_fujitsu_remove(struct acpi_device *device, int type) |
d0482533 JW |
229 | { |
230 | ACPI_FUNCTION_TRACE("acpi_fujitsu_remove"); | |
231 | ||
232 | if (!device || !acpi_driver_data(device)) | |
233 | return -EINVAL; | |
5cf83b9b | 234 | fujitsu->acpi_handle = NULL; |
d0482533 JW |
235 | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static const struct acpi_device_id fujitsu_device_ids[] = { | |
240 | {ACPI_FUJITSU_HID, 0}, | |
241 | {"", 0}, | |
242 | }; | |
243 | ||
244 | static struct acpi_driver acpi_fujitsu_driver = { | |
245 | .name = ACPI_FUJITSU_DRIVER_NAME, | |
246 | .class = ACPI_FUJITSU_CLASS, | |
247 | .ids = fujitsu_device_ids, | |
248 | .ops = { | |
249 | .add = acpi_fujitsu_add, | |
250 | .remove = acpi_fujitsu_remove, | |
251 | }, | |
252 | }; | |
253 | ||
254 | /* Initialization */ | |
255 | ||
256 | static int __init fujitsu_init(void) | |
257 | { | |
258 | int ret, result; | |
259 | ||
260 | if (acpi_disabled) | |
261 | return -ENODEV; | |
262 | ||
263 | fujitsu = kmalloc(sizeof(struct fujitsu_t), GFP_KERNEL); | |
264 | if (!fujitsu) | |
265 | return -ENOMEM; | |
266 | memset(fujitsu, 0, sizeof(struct fujitsu_t)); | |
267 | ||
268 | result = acpi_bus_register_driver(&acpi_fujitsu_driver); | |
269 | if (result < 0) { | |
270 | ret = -ENODEV; | |
271 | goto fail_acpi; | |
272 | } | |
273 | ||
274 | /* Register backlight stuff */ | |
275 | ||
276 | fujitsu->bl_device = | |
277 | backlight_device_register("fujitsu-laptop", NULL, NULL, | |
278 | &fujitsubl_ops); | |
279 | if (IS_ERR(fujitsu->bl_device)) | |
280 | return PTR_ERR(fujitsu->bl_device); | |
281 | ||
282 | fujitsu->bl_device->props.max_brightness = FUJITSU_LCD_N_LEVELS - 1; | |
283 | ret = platform_driver_register(&fujitsupf_driver); | |
284 | if (ret) | |
285 | goto fail_backlight; | |
286 | ||
287 | /* Register platform stuff */ | |
288 | ||
289 | fujitsu->pf_device = platform_device_alloc("fujitsu-laptop", -1); | |
290 | if (!fujitsu->pf_device) { | |
291 | ret = -ENOMEM; | |
292 | goto fail_platform_driver; | |
293 | } | |
294 | ||
295 | ret = platform_device_add(fujitsu->pf_device); | |
296 | if (ret) | |
297 | goto fail_platform_device1; | |
298 | ||
299 | ret = | |
300 | sysfs_create_group(&fujitsu->pf_device->dev.kobj, | |
301 | &fujitsupf_attribute_group); | |
302 | if (ret) | |
303 | goto fail_platform_device2; | |
304 | ||
305 | printk(KERN_INFO "fujitsu-laptop: driver " FUJITSU_DRIVER_VERSION | |
306 | " successfully loaded.\n"); | |
307 | ||
308 | return 0; | |
309 | ||
310 | fail_platform_device2: | |
311 | ||
312 | platform_device_del(fujitsu->pf_device); | |
313 | ||
314 | fail_platform_device1: | |
315 | ||
316 | platform_device_put(fujitsu->pf_device); | |
317 | ||
318 | fail_platform_driver: | |
319 | ||
320 | platform_driver_unregister(&fujitsupf_driver); | |
321 | ||
322 | fail_backlight: | |
323 | ||
324 | backlight_device_unregister(fujitsu->bl_device); | |
325 | ||
326 | fail_acpi: | |
327 | ||
328 | kfree(fujitsu); | |
329 | ||
330 | return ret; | |
331 | } | |
332 | ||
333 | static void __exit fujitsu_cleanup(void) | |
334 | { | |
335 | sysfs_remove_group(&fujitsu->pf_device->dev.kobj, | |
336 | &fujitsupf_attribute_group); | |
337 | platform_device_unregister(fujitsu->pf_device); | |
338 | platform_driver_unregister(&fujitsupf_driver); | |
339 | backlight_device_unregister(fujitsu->bl_device); | |
340 | ||
341 | acpi_bus_unregister_driver(&acpi_fujitsu_driver); | |
342 | ||
343 | kfree(fujitsu); | |
344 | ||
345 | printk(KERN_INFO "fujitsu-laptop: driver unloaded.\n"); | |
346 | } | |
347 | ||
348 | module_init(fujitsu_init); | |
349 | module_exit(fujitsu_cleanup); | |
350 | ||
351 | MODULE_AUTHOR("Jonathan Woithe"); | |
352 | MODULE_DESCRIPTION("Fujitsu laptop extras support"); | |
353 | MODULE_VERSION(FUJITSU_DRIVER_VERSION); | |
354 | MODULE_LICENSE("GPL"); |