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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> | |
53 | #include <linux/autoconf.h> | |
54 | ||
55 | #define FUJITSU_DRIVER_VERSION "0.3" | |
56 | ||
57 | #define FUJITSU_LCD_N_LEVELS 8 | |
58 | ||
59 | #define ACPI_FUJITSU_CLASS "fujitsu" | |
60 | #define ACPI_FUJITSU_HID "FUJ02B1" | |
61 | #define ACPI_FUJITSU_DRIVER_NAME "Fujitsu laptop FUJ02B1 ACPI extras driver" | |
62 | #define ACPI_FUJITSU_DEVICE_NAME "Fujitsu FUJ02B1" | |
63 | ||
64 | struct fujitsu_t { | |
65 | acpi_handle acpi_handle; | |
66 | struct backlight_device *bl_device; | |
67 | struct platform_device *pf_device; | |
68 | ||
69 | unsigned long fuj02b1_state; | |
70 | unsigned int brightness_changed; | |
71 | unsigned int brightness_level; | |
72 | }; | |
73 | ||
74 | static struct fujitsu_t *fujitsu; | |
75 | ||
76 | /* Hardware access */ | |
77 | ||
78 | static int set_lcd_level(int level) | |
79 | { | |
80 | acpi_status status = AE_OK; | |
81 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
82 | struct acpi_object_list arg_list = { 1, &arg0 }; | |
83 | acpi_handle handle = NULL; | |
84 | ||
85 | if (level < 0 || level >= FUJITSU_LCD_N_LEVELS) | |
86 | return -EINVAL; | |
87 | ||
88 | if (!fujitsu) | |
89 | return -EINVAL; | |
90 | ||
91 | status = acpi_get_handle(fujitsu->acpi_handle, "SBLL", &handle); | |
92 | if (ACPI_FAILURE(status)) { | |
93 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "SBLL not present\n")); | |
94 | return -ENODEV; | |
95 | } | |
96 | ||
97 | arg0.integer.value = level; | |
98 | ||
99 | status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); | |
100 | if (ACPI_FAILURE(status)) | |
101 | return -ENODEV; | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static int get_lcd_level(void) | |
107 | { | |
108 | unsigned long state = 0; | |
109 | acpi_status status = AE_OK; | |
110 | ||
111 | // Get the Brightness | |
112 | status = | |
113 | acpi_evaluate_integer(fujitsu->acpi_handle, "GBLL", NULL, &state); | |
114 | if (status < 0) | |
115 | return status; | |
116 | ||
117 | fujitsu->fuj02b1_state = state; | |
118 | fujitsu->brightness_level = state & 0x0fffffff; | |
119 | ||
120 | if (state & 0x80000000) | |
121 | fujitsu->brightness_changed = 1; | |
122 | else | |
123 | fujitsu->brightness_changed = 0; | |
124 | ||
d0482533 JW |
125 | return fujitsu->brightness_level; |
126 | } | |
127 | ||
128 | /* Backlight device stuff */ | |
129 | ||
130 | static int bl_get_brightness(struct backlight_device *b) | |
131 | { | |
132 | return get_lcd_level(); | |
133 | } | |
134 | ||
135 | static int bl_update_status(struct backlight_device *b) | |
136 | { | |
137 | return set_lcd_level(b->props.brightness); | |
138 | } | |
139 | ||
140 | static struct backlight_ops fujitsubl_ops = { | |
141 | .get_brightness = bl_get_brightness, | |
142 | .update_status = bl_update_status, | |
143 | }; | |
144 | ||
145 | /* Platform device */ | |
146 | ||
147 | static ssize_t show_lcd_level(struct device *dev, | |
148 | struct device_attribute *attr, char *buf) | |
149 | { | |
150 | ||
151 | int ret; | |
152 | ||
153 | ret = get_lcd_level(); | |
154 | if (ret < 0) | |
155 | return ret; | |
156 | ||
157 | return sprintf(buf, "%i\n", ret); | |
158 | } | |
159 | ||
160 | static ssize_t store_lcd_level(struct device *dev, | |
161 | struct device_attribute *attr, const char *buf, | |
162 | size_t count) | |
163 | { | |
164 | ||
165 | int level, ret; | |
166 | ||
167 | if (sscanf(buf, "%i", &level) != 1 | |
168 | || (level < 0 || level >= FUJITSU_LCD_N_LEVELS)) | |
169 | return -EINVAL; | |
170 | ||
171 | ret = set_lcd_level(level); | |
172 | if (ret < 0) | |
173 | return ret; | |
174 | ||
175 | return count; | |
176 | } | |
177 | ||
178 | static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level); | |
179 | ||
180 | static struct attribute *fujitsupf_attributes[] = { | |
181 | &dev_attr_lcd_level.attr, | |
182 | NULL | |
183 | }; | |
184 | ||
185 | static struct attribute_group fujitsupf_attribute_group = { | |
186 | .attrs = fujitsupf_attributes | |
187 | }; | |
188 | ||
189 | static struct platform_driver fujitsupf_driver = { | |
190 | .driver = { | |
191 | .name = "fujitsu-laptop", | |
192 | .owner = THIS_MODULE, | |
193 | } | |
194 | }; | |
195 | ||
196 | /* ACPI device */ | |
197 | ||
b6f03ae6 | 198 | static int acpi_fujitsu_add(struct acpi_device *device) |
d0482533 JW |
199 | { |
200 | int result = 0; | |
201 | int state = 0; | |
202 | ||
203 | ACPI_FUNCTION_TRACE("acpi_fujitsu_add"); | |
204 | ||
205 | if (!device) | |
206 | return -EINVAL; | |
207 | ||
208 | fujitsu->acpi_handle = device->handle; | |
209 | sprintf(acpi_device_name(device), "%s", ACPI_FUJITSU_DEVICE_NAME); | |
210 | sprintf(acpi_device_class(device), "%s", ACPI_FUJITSU_CLASS); | |
211 | acpi_driver_data(device) = fujitsu; | |
212 | ||
213 | result = acpi_bus_get_power(fujitsu->acpi_handle, &state); | |
214 | if (result) { | |
215 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
216 | "Error reading power state\n")); | |
217 | goto end; | |
218 | } | |
219 | ||
220 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
221 | acpi_device_name(device), acpi_device_bid(device), | |
222 | !device->power.state ? "on" : "off"); | |
223 | ||
224 | end: | |
225 | ||
226 | return result; | |
227 | } | |
228 | ||
b6f03ae6 | 229 | static int acpi_fujitsu_remove(struct acpi_device *device, int type) |
d0482533 JW |
230 | { |
231 | ACPI_FUNCTION_TRACE("acpi_fujitsu_remove"); | |
232 | ||
233 | if (!device || !acpi_driver_data(device)) | |
234 | return -EINVAL; | |
235 | fujitsu->acpi_handle = 0; | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static const struct acpi_device_id fujitsu_device_ids[] = { | |
241 | {ACPI_FUJITSU_HID, 0}, | |
242 | {"", 0}, | |
243 | }; | |
244 | ||
245 | static struct acpi_driver acpi_fujitsu_driver = { | |
246 | .name = ACPI_FUJITSU_DRIVER_NAME, | |
247 | .class = ACPI_FUJITSU_CLASS, | |
248 | .ids = fujitsu_device_ids, | |
249 | .ops = { | |
250 | .add = acpi_fujitsu_add, | |
251 | .remove = acpi_fujitsu_remove, | |
252 | }, | |
253 | }; | |
254 | ||
255 | /* Initialization */ | |
256 | ||
257 | static int __init fujitsu_init(void) | |
258 | { | |
259 | int ret, result; | |
260 | ||
261 | if (acpi_disabled) | |
262 | return -ENODEV; | |
263 | ||
264 | fujitsu = kmalloc(sizeof(struct fujitsu_t), GFP_KERNEL); | |
265 | if (!fujitsu) | |
266 | return -ENOMEM; | |
267 | memset(fujitsu, 0, sizeof(struct fujitsu_t)); | |
268 | ||
269 | result = acpi_bus_register_driver(&acpi_fujitsu_driver); | |
270 | if (result < 0) { | |
271 | ret = -ENODEV; | |
272 | goto fail_acpi; | |
273 | } | |
274 | ||
275 | /* Register backlight stuff */ | |
276 | ||
277 | fujitsu->bl_device = | |
278 | backlight_device_register("fujitsu-laptop", NULL, NULL, | |
279 | &fujitsubl_ops); | |
280 | if (IS_ERR(fujitsu->bl_device)) | |
281 | return PTR_ERR(fujitsu->bl_device); | |
282 | ||
283 | fujitsu->bl_device->props.max_brightness = FUJITSU_LCD_N_LEVELS - 1; | |
284 | ret = platform_driver_register(&fujitsupf_driver); | |
285 | if (ret) | |
286 | goto fail_backlight; | |
287 | ||
288 | /* Register platform stuff */ | |
289 | ||
290 | fujitsu->pf_device = platform_device_alloc("fujitsu-laptop", -1); | |
291 | if (!fujitsu->pf_device) { | |
292 | ret = -ENOMEM; | |
293 | goto fail_platform_driver; | |
294 | } | |
295 | ||
296 | ret = platform_device_add(fujitsu->pf_device); | |
297 | if (ret) | |
298 | goto fail_platform_device1; | |
299 | ||
300 | ret = | |
301 | sysfs_create_group(&fujitsu->pf_device->dev.kobj, | |
302 | &fujitsupf_attribute_group); | |
303 | if (ret) | |
304 | goto fail_platform_device2; | |
305 | ||
306 | printk(KERN_INFO "fujitsu-laptop: driver " FUJITSU_DRIVER_VERSION | |
307 | " successfully loaded.\n"); | |
308 | ||
309 | return 0; | |
310 | ||
311 | fail_platform_device2: | |
312 | ||
313 | platform_device_del(fujitsu->pf_device); | |
314 | ||
315 | fail_platform_device1: | |
316 | ||
317 | platform_device_put(fujitsu->pf_device); | |
318 | ||
319 | fail_platform_driver: | |
320 | ||
321 | platform_driver_unregister(&fujitsupf_driver); | |
322 | ||
323 | fail_backlight: | |
324 | ||
325 | backlight_device_unregister(fujitsu->bl_device); | |
326 | ||
327 | fail_acpi: | |
328 | ||
329 | kfree(fujitsu); | |
330 | ||
331 | return ret; | |
332 | } | |
333 | ||
334 | static void __exit fujitsu_cleanup(void) | |
335 | { | |
336 | sysfs_remove_group(&fujitsu->pf_device->dev.kobj, | |
337 | &fujitsupf_attribute_group); | |
338 | platform_device_unregister(fujitsu->pf_device); | |
339 | platform_driver_unregister(&fujitsupf_driver); | |
340 | backlight_device_unregister(fujitsu->bl_device); | |
341 | ||
342 | acpi_bus_unregister_driver(&acpi_fujitsu_driver); | |
343 | ||
344 | kfree(fujitsu); | |
345 | ||
346 | printk(KERN_INFO "fujitsu-laptop: driver unloaded.\n"); | |
347 | } | |
348 | ||
349 | module_init(fujitsu_init); | |
350 | module_exit(fujitsu_cleanup); | |
351 | ||
352 | MODULE_AUTHOR("Jonathan Woithe"); | |
353 | MODULE_DESCRIPTION("Fujitsu laptop extras support"); | |
354 | MODULE_VERSION(FUJITSU_DRIVER_VERSION); | |
355 | MODULE_LICENSE("GPL"); |