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Diffstat (limited to 'drivers/misc/fujitsu-laptop.c')
-rw-r--r--drivers/misc/fujitsu-laptop.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/drivers/misc/fujitsu-laptop.c b/drivers/misc/fujitsu-laptop.c
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index 000000000000..d366a6cc1fd9
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+++ b/drivers/misc/fujitsu-laptop.c
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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
64struct 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
74static struct fujitsu_t *fujitsu;
75
76/* Hardware access */
77
78static 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
106static 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
125 if (status < 0)
126 return status;
127
128 return fujitsu->brightness_level;
129}
130
131/* Backlight device stuff */
132
133static int bl_get_brightness(struct backlight_device *b)
134{
135 return get_lcd_level();
136}
137
138static int bl_update_status(struct backlight_device *b)
139{
140 return set_lcd_level(b->props.brightness);
141}
142
143static struct backlight_ops fujitsubl_ops = {
144 .get_brightness = bl_get_brightness,
145 .update_status = bl_update_status,
146};
147
148/* Platform device */
149
150static ssize_t show_lcd_level(struct device *dev,
151 struct device_attribute *attr, char *buf)
152{
153
154 int ret;
155
156 ret = get_lcd_level();
157 if (ret < 0)
158 return ret;
159
160 return sprintf(buf, "%i\n", ret);
161}
162
163static ssize_t store_lcd_level(struct device *dev,
164 struct device_attribute *attr, const char *buf,
165 size_t count)
166{
167
168 int level, ret;
169
170 if (sscanf(buf, "%i", &level) != 1
171 || (level < 0 || level >= FUJITSU_LCD_N_LEVELS))
172 return -EINVAL;
173
174 ret = set_lcd_level(level);
175 if (ret < 0)
176 return ret;
177
178 return count;
179}
180
181static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
182
183static struct attribute *fujitsupf_attributes[] = {
184 &dev_attr_lcd_level.attr,
185 NULL
186};
187
188static struct attribute_group fujitsupf_attribute_group = {
189 .attrs = fujitsupf_attributes
190};
191
192static struct platform_driver fujitsupf_driver = {
193 .driver = {
194 .name = "fujitsu-laptop",
195 .owner = THIS_MODULE,
196 }
197};
198
199/* ACPI device */
200
201int acpi_fujitsu_add(struct acpi_device *device)
202{
203 int result = 0;
204 int state = 0;
205
206 ACPI_FUNCTION_TRACE("acpi_fujitsu_add");
207
208 if (!device)
209 return -EINVAL;
210
211 fujitsu->acpi_handle = device->handle;
212 sprintf(acpi_device_name(device), "%s", ACPI_FUJITSU_DEVICE_NAME);
213 sprintf(acpi_device_class(device), "%s", ACPI_FUJITSU_CLASS);
214 acpi_driver_data(device) = fujitsu;
215
216 result = acpi_bus_get_power(fujitsu->acpi_handle, &state);
217 if (result) {
218 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
219 "Error reading power state\n"));
220 goto end;
221 }
222
223 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
224 acpi_device_name(device), acpi_device_bid(device),
225 !device->power.state ? "on" : "off");
226
227 end:
228
229 return result;
230}
231
232int acpi_fujitsu_remove(struct acpi_device *device, int type)
233{
234 ACPI_FUNCTION_TRACE("acpi_fujitsu_remove");
235
236 if (!device || !acpi_driver_data(device))
237 return -EINVAL;
238 fujitsu->acpi_handle = 0;
239
240 return 0;
241}
242
243static const struct acpi_device_id fujitsu_device_ids[] = {
244 {ACPI_FUJITSU_HID, 0},
245 {"", 0},
246};
247
248static struct acpi_driver acpi_fujitsu_driver = {
249 .name = ACPI_FUJITSU_DRIVER_NAME,
250 .class = ACPI_FUJITSU_CLASS,
251 .ids = fujitsu_device_ids,
252 .ops = {
253 .add = acpi_fujitsu_add,
254 .remove = acpi_fujitsu_remove,
255 },
256};
257
258/* Initialization */
259
260static int __init fujitsu_init(void)
261{
262 int ret, result;
263
264 if (acpi_disabled)
265 return -ENODEV;
266
267 fujitsu = kmalloc(sizeof(struct fujitsu_t), GFP_KERNEL);
268 if (!fujitsu)
269 return -ENOMEM;
270 memset(fujitsu, 0, sizeof(struct fujitsu_t));
271
272 result = acpi_bus_register_driver(&acpi_fujitsu_driver);
273 if (result < 0) {
274 ret = -ENODEV;
275 goto fail_acpi;
276 }
277
278 /* Register backlight stuff */
279
280 fujitsu->bl_device =
281 backlight_device_register("fujitsu-laptop", NULL, NULL,
282 &fujitsubl_ops);
283 if (IS_ERR(fujitsu->bl_device))
284 return PTR_ERR(fujitsu->bl_device);
285
286 fujitsu->bl_device->props.max_brightness = FUJITSU_LCD_N_LEVELS - 1;
287 ret = platform_driver_register(&fujitsupf_driver);
288 if (ret)
289 goto fail_backlight;
290
291 /* Register platform stuff */
292
293 fujitsu->pf_device = platform_device_alloc("fujitsu-laptop", -1);
294 if (!fujitsu->pf_device) {
295 ret = -ENOMEM;
296 goto fail_platform_driver;
297 }
298
299 ret = platform_device_add(fujitsu->pf_device);
300 if (ret)
301 goto fail_platform_device1;
302
303 ret =
304 sysfs_create_group(&fujitsu->pf_device->dev.kobj,
305 &fujitsupf_attribute_group);
306 if (ret)
307 goto fail_platform_device2;
308
309 printk(KERN_INFO "fujitsu-laptop: driver " FUJITSU_DRIVER_VERSION
310 " successfully loaded.\n");
311
312 return 0;
313
314 fail_platform_device2:
315
316 platform_device_del(fujitsu->pf_device);
317
318 fail_platform_device1:
319
320 platform_device_put(fujitsu->pf_device);
321
322 fail_platform_driver:
323
324 platform_driver_unregister(&fujitsupf_driver);
325
326 fail_backlight:
327
328 backlight_device_unregister(fujitsu->bl_device);
329
330 fail_acpi:
331
332 kfree(fujitsu);
333
334 return ret;
335}
336
337static void __exit fujitsu_cleanup(void)
338{
339 sysfs_remove_group(&fujitsu->pf_device->dev.kobj,
340 &fujitsupf_attribute_group);
341 platform_device_unregister(fujitsu->pf_device);
342 platform_driver_unregister(&fujitsupf_driver);
343 backlight_device_unregister(fujitsu->bl_device);
344
345 acpi_bus_unregister_driver(&acpi_fujitsu_driver);
346
347 kfree(fujitsu);
348
349 printk(KERN_INFO "fujitsu-laptop: driver unloaded.\n");
350}
351
352module_init(fujitsu_init);
353module_exit(fujitsu_cleanup);
354
355MODULE_AUTHOR("Jonathan Woithe");
356MODULE_DESCRIPTION("Fujitsu laptop extras support");
357MODULE_VERSION(FUJITSU_DRIVER_VERSION);
358MODULE_LICENSE("GPL");