1cfd7f3f129400fd9d8d22d429689d6d29234d4a
[sfrench/cifs-2.6.git] / drivers / misc / fujitsu-laptop.c
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
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
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
197 static int acpi_fujitsu_add(struct acpi_device *device)
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
228 static int acpi_fujitsu_remove(struct acpi_device *device, int type)
229 {
230         ACPI_FUNCTION_TRACE("acpi_fujitsu_remove");
231
232         if (!device || !acpi_driver_data(device))
233                 return -EINVAL;
234         fujitsu->acpi_handle = 0;
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");