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8c4c731a LP |
1 | /*-*-linux-c-*-*/ |
2 | ||
3 | /* | |
4 | Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de> | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
19 | 02110-1301, USA. | |
20 | */ | |
21 | ||
22 | /* | |
23 | * msi-laptop.c - MSI S270 laptop support. This laptop is sold under | |
24 | * various brands, including "Cytron/TCM/Medion/Tchibo MD96100". | |
25 | * | |
26 | * This driver exports a few files in /sys/devices/platform/msi-laptop-pf/: | |
27 | * | |
28 | * lcd_level - Screen brightness: contains a single integer in the | |
29 | * range 0..8. (rw) | |
30 | * | |
31 | * auto_brightness - Enable automatic brightness control: contains | |
32 | * either 0 or 1. If set to 1 the hardware adjusts the screen | |
33 | * brightness automatically when the power cord is | |
34 | * plugged/unplugged. (rw) | |
35 | * | |
36 | * wlan - WLAN subsystem enabled: contains either 0 or 1. (ro) | |
37 | * | |
38 | * bluetooth - Bluetooth subsystem enabled: contains either 0 or 1 | |
39 | * Please note that this file is constantly 0 if no Bluetooth | |
40 | * hardware is available. (ro) | |
41 | * | |
42 | * In addition to these platform device attributes the driver | |
43 | * registers itself in the Linux backlight control subsystem and is | |
44 | * available to userspace under /sys/class/backlight/msi-laptop-bl/. | |
45 | * | |
46 | * This driver might work on other laptops produced by MSI. If you | |
47 | * want to try it you can pass force=1 as argument to the module which | |
48 | * will force it to load even when the DMI data doesn't identify the | |
49 | * laptop as MSI S270. YMMV. | |
50 | */ | |
51 | ||
52 | #include <linux/module.h> | |
53 | #include <linux/kernel.h> | |
54 | #include <linux/init.h> | |
55 | #include <linux/acpi.h> | |
56 | #include <linux/dmi.h> | |
57 | #include <linux/backlight.h> | |
58 | #include <linux/platform_device.h> | |
59 | #include <linux/autoconf.h> | |
60 | ||
61 | #define MSI_DRIVER_VERSION "0.5" | |
62 | ||
63 | #define MSI_LCD_LEVEL_MAX 9 | |
64 | ||
65 | #define MSI_EC_COMMAND_WIRELESS 0x10 | |
66 | #define MSI_EC_COMMAND_LCD_LEVEL 0x11 | |
67 | ||
68 | static int force; | |
69 | module_param(force, bool, 0); | |
70 | MODULE_PARM_DESC(force, "Force driver load, ignore DMI data"); | |
71 | ||
72 | static int auto_brightness; | |
73 | module_param(auto_brightness, int, 0); | |
74 | MODULE_PARM_DESC(auto_brightness, "Enable automatic brightness control (0: disabled; 1: enabled; 2: don't touch)"); | |
75 | ||
76 | /* Hardware access */ | |
77 | ||
78 | static int set_lcd_level(int level) | |
79 | { | |
80 | u8 buf[2]; | |
81 | ||
82 | if (level < 0 || level >= MSI_LCD_LEVEL_MAX) | |
83 | return -EINVAL; | |
84 | ||
85 | buf[0] = 0x80; | |
86 | buf[1] = (u8) (level*31); | |
87 | ||
88 | return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, buf, sizeof(buf), NULL, 0); | |
89 | } | |
90 | ||
91 | static int get_lcd_level(void) | |
92 | { | |
93 | u8 wdata = 0, rdata; | |
94 | int result; | |
95 | ||
96 | result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1); | |
97 | if (result < 0) | |
98 | return result; | |
99 | ||
100 | return (int) rdata / 31; | |
101 | } | |
102 | ||
103 | static int get_auto_brightness(void) | |
104 | { | |
105 | u8 wdata = 4, rdata; | |
106 | int result; | |
107 | ||
108 | result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1); | |
109 | if (result < 0) | |
110 | return result; | |
111 | ||
112 | return !!(rdata & 8); | |
113 | } | |
114 | ||
115 | static int set_auto_brightness(int enable) | |
116 | { | |
117 | u8 wdata[2], rdata; | |
118 | int result; | |
119 | ||
120 | wdata[0] = 4; | |
121 | ||
122 | result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 1, &rdata, 1); | |
123 | if (result < 0) | |
124 | return result; | |
125 | ||
126 | wdata[0] = 0x84; | |
127 | wdata[1] = (rdata & 0xF7) | (enable ? 8 : 0); | |
128 | ||
129 | return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 2, NULL, 0); | |
130 | } | |
131 | ||
132 | static int get_wireless_state(int *wlan, int *bluetooth) | |
133 | { | |
134 | u8 wdata = 0, rdata; | |
135 | int result; | |
136 | ||
137 | result = ec_transaction(MSI_EC_COMMAND_WIRELESS, &wdata, 1, &rdata, 1); | |
138 | if (result < 0) | |
139 | return -1; | |
140 | ||
141 | if (wlan) | |
142 | *wlan = !!(rdata & 8); | |
143 | ||
144 | if (bluetooth) | |
145 | *bluetooth = !!(rdata & 128); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | /* Backlight device stuff */ | |
151 | ||
152 | static int bl_get_brightness(struct backlight_device *b) | |
153 | { | |
154 | return get_lcd_level(); | |
155 | } | |
156 | ||
157 | ||
158 | static int bl_update_status(struct backlight_device *b) | |
159 | { | |
599a52d1 | 160 | return set_lcd_level(b->props.brightness); |
8c4c731a LP |
161 | } |
162 | ||
599a52d1 | 163 | static struct backlight_ops msibl_ops = { |
8c4c731a LP |
164 | .get_brightness = bl_get_brightness, |
165 | .update_status = bl_update_status, | |
8c4c731a LP |
166 | }; |
167 | ||
168 | static struct backlight_device *msibl_device; | |
169 | ||
170 | /* Platform device */ | |
171 | ||
172 | static ssize_t show_wlan(struct device *dev, | |
173 | struct device_attribute *attr, char *buf) | |
174 | { | |
175 | ||
176 | int ret, enabled; | |
177 | ||
178 | ret = get_wireless_state(&enabled, NULL); | |
179 | if (ret < 0) | |
180 | return ret; | |
181 | ||
182 | return sprintf(buf, "%i\n", enabled); | |
183 | } | |
184 | ||
185 | static ssize_t show_bluetooth(struct device *dev, | |
186 | struct device_attribute *attr, char *buf) | |
187 | { | |
188 | ||
189 | int ret, enabled; | |
190 | ||
191 | ret = get_wireless_state(NULL, &enabled); | |
192 | if (ret < 0) | |
193 | return ret; | |
194 | ||
195 | return sprintf(buf, "%i\n", enabled); | |
196 | } | |
197 | ||
198 | static ssize_t show_lcd_level(struct device *dev, | |
199 | struct device_attribute *attr, char *buf) | |
200 | { | |
201 | ||
202 | int ret; | |
203 | ||
204 | ret = get_lcd_level(); | |
205 | if (ret < 0) | |
206 | return ret; | |
207 | ||
208 | return sprintf(buf, "%i\n", ret); | |
209 | } | |
210 | ||
211 | static ssize_t store_lcd_level(struct device *dev, | |
212 | struct device_attribute *attr, const char *buf, size_t count) | |
213 | { | |
214 | ||
215 | int level, ret; | |
216 | ||
217 | if (sscanf(buf, "%i", &level) != 1 || (level < 0 || level >= MSI_LCD_LEVEL_MAX)) | |
218 | return -EINVAL; | |
219 | ||
220 | ret = set_lcd_level(level); | |
221 | if (ret < 0) | |
222 | return ret; | |
223 | ||
224 | return count; | |
225 | } | |
226 | ||
227 | static ssize_t show_auto_brightness(struct device *dev, | |
228 | struct device_attribute *attr, char *buf) | |
229 | { | |
230 | ||
231 | int ret; | |
232 | ||
233 | ret = get_auto_brightness(); | |
234 | if (ret < 0) | |
235 | return ret; | |
236 | ||
237 | return sprintf(buf, "%i\n", ret); | |
238 | } | |
239 | ||
240 | static ssize_t store_auto_brightness(struct device *dev, | |
241 | struct device_attribute *attr, const char *buf, size_t count) | |
242 | { | |
243 | ||
244 | int enable, ret; | |
245 | ||
246 | if (sscanf(buf, "%i", &enable) != 1 || (enable != (enable & 1))) | |
247 | return -EINVAL; | |
248 | ||
249 | ret = set_auto_brightness(enable); | |
250 | if (ret < 0) | |
251 | return ret; | |
252 | ||
253 | return count; | |
254 | } | |
255 | ||
256 | static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level); | |
257 | static DEVICE_ATTR(auto_brightness, 0644, show_auto_brightness, store_auto_brightness); | |
258 | static DEVICE_ATTR(bluetooth, 0444, show_bluetooth, NULL); | |
259 | static DEVICE_ATTR(wlan, 0444, show_wlan, NULL); | |
260 | ||
261 | static struct attribute *msipf_attributes[] = { | |
262 | &dev_attr_lcd_level.attr, | |
263 | &dev_attr_auto_brightness.attr, | |
264 | &dev_attr_bluetooth.attr, | |
265 | &dev_attr_wlan.attr, | |
266 | NULL | |
267 | }; | |
268 | ||
269 | static struct attribute_group msipf_attribute_group = { | |
270 | .attrs = msipf_attributes | |
271 | }; | |
272 | ||
273 | static struct platform_driver msipf_driver = { | |
274 | .driver = { | |
275 | .name = "msi-laptop-pf", | |
276 | .owner = THIS_MODULE, | |
277 | } | |
278 | }; | |
279 | ||
280 | static struct platform_device *msipf_device; | |
281 | ||
282 | /* Initialization */ | |
283 | ||
284 | static struct dmi_system_id __initdata msi_dmi_table[] = { | |
285 | { | |
286 | .ident = "MSI S270", | |
287 | .matches = { | |
288 | DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT'L CO.,LTD"), | |
289 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-1013"), | |
290 | } | |
291 | }, | |
292 | { | |
293 | .ident = "Medion MD96100", | |
294 | .matches = { | |
295 | DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"), | |
296 | DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"), | |
297 | } | |
298 | }, | |
299 | { } | |
300 | }; | |
301 | ||
302 | ||
303 | static int __init msi_init(void) | |
304 | { | |
305 | int ret; | |
306 | ||
307 | if (acpi_disabled) | |
308 | return -ENODEV; | |
309 | ||
310 | if (!force && !dmi_check_system(msi_dmi_table)) | |
311 | return -ENODEV; | |
312 | ||
313 | if (auto_brightness < 0 || auto_brightness > 2) | |
314 | return -EINVAL; | |
315 | ||
316 | /* Register backlight stuff */ | |
317 | ||
519ab5f2 | 318 | msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL, |
599a52d1 | 319 | &msibl_ops); |
8c4c731a LP |
320 | if (IS_ERR(msibl_device)) |
321 | return PTR_ERR(msibl_device); | |
322 | ||
599a52d1 RP |
323 | msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1, |
324 | ||
8c4c731a LP |
325 | ret = platform_driver_register(&msipf_driver); |
326 | if (ret) | |
327 | goto fail_backlight; | |
328 | ||
329 | /* Register platform stuff */ | |
330 | ||
331 | msipf_device = platform_device_alloc("msi-laptop-pf", -1); | |
332 | if (!msipf_device) { | |
333 | ret = -ENOMEM; | |
334 | goto fail_platform_driver; | |
335 | } | |
336 | ||
337 | ret = platform_device_add(msipf_device); | |
338 | if (ret) | |
339 | goto fail_platform_device1; | |
340 | ||
341 | ret = sysfs_create_group(&msipf_device->dev.kobj, &msipf_attribute_group); | |
342 | if (ret) | |
343 | goto fail_platform_device2; | |
344 | ||
345 | /* Disable automatic brightness control by default because | |
346 | * this module was probably loaded to do brightness control in | |
347 | * software. */ | |
348 | ||
349 | if (auto_brightness != 2) | |
350 | set_auto_brightness(auto_brightness); | |
351 | ||
352 | printk(KERN_INFO "msi-laptop: driver "MSI_DRIVER_VERSION" successfully loaded.\n"); | |
353 | ||
354 | return 0; | |
355 | ||
356 | fail_platform_device2: | |
357 | ||
358 | platform_device_del(msipf_device); | |
359 | ||
360 | fail_platform_device1: | |
361 | ||
362 | platform_device_put(msipf_device); | |
363 | ||
364 | fail_platform_driver: | |
365 | ||
366 | platform_driver_unregister(&msipf_driver); | |
367 | ||
368 | fail_backlight: | |
369 | ||
370 | backlight_device_unregister(msibl_device); | |
371 | ||
372 | return ret; | |
373 | } | |
374 | ||
375 | static void __exit msi_cleanup(void) | |
376 | { | |
377 | ||
378 | sysfs_remove_group(&msipf_device->dev.kobj, &msipf_attribute_group); | |
379 | platform_device_unregister(msipf_device); | |
380 | platform_driver_unregister(&msipf_driver); | |
381 | backlight_device_unregister(msibl_device); | |
382 | ||
383 | /* Enable automatic brightness control again */ | |
384 | if (auto_brightness != 2) | |
385 | set_auto_brightness(1); | |
386 | ||
387 | printk(KERN_INFO "msi-laptop: driver unloaded.\n"); | |
388 | } | |
389 | ||
390 | module_init(msi_init); | |
391 | module_exit(msi_cleanup); | |
392 | ||
393 | MODULE_AUTHOR("Lennart Poettering"); | |
394 | MODULE_DESCRIPTION("MSI Laptop Support"); | |
395 | MODULE_VERSION(MSI_DRIVER_VERSION); | |
396 | MODULE_LICENSE("GPL"); |