Merge branch 'fix/hda' into for-linus
[linux-2.6] / drivers / platform / x86 / dell-laptop.c
1 /*
2  *  Driver for Dell laptop extras
3  *
4  *  Copyright (c) Red Hat <mjg@redhat.com>
5  *
6  *  Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
7  *  Inc.
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License version 2 as
11  *  published by the Free Software Foundation.
12  */
13
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/platform_device.h>
18 #include <linux/backlight.h>
19 #include <linux/err.h>
20 #include <linux/dmi.h>
21 #include <linux/io.h>
22 #include <linux/rfkill.h>
23 #include <linux/power_supply.h>
24 #include <linux/acpi.h>
25 #include "../../firmware/dcdbas.h"
26
27 #define BRIGHTNESS_TOKEN 0x7d
28
29 /* This structure will be modified by the firmware when we enter
30  * system management mode, hence the volatiles */
31
32 struct calling_interface_buffer {
33         u16 class;
34         u16 select;
35         volatile u32 input[4];
36         volatile u32 output[4];
37 } __packed;
38
39 struct calling_interface_token {
40         u16 tokenID;
41         u16 location;
42         union {
43                 u16 value;
44                 u16 stringlength;
45         };
46 };
47
48 struct calling_interface_structure {
49         struct dmi_header header;
50         u16 cmdIOAddress;
51         u8 cmdIOCode;
52         u32 supportedCmds;
53         struct calling_interface_token tokens[];
54 } __packed;
55
56 static int da_command_address;
57 static int da_command_code;
58 static int da_num_tokens;
59 static struct calling_interface_token *da_tokens;
60
61 static struct backlight_device *dell_backlight_device;
62 static struct rfkill *wifi_rfkill;
63 static struct rfkill *bluetooth_rfkill;
64 static struct rfkill *wwan_rfkill;
65
66 static const struct dmi_system_id __initdata dell_device_table[] = {
67         {
68                 .ident = "Dell laptop",
69                 .matches = {
70                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
71                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
72                 },
73         },
74         { }
75 };
76
77 static void parse_da_table(const struct dmi_header *dm)
78 {
79         /* Final token is a terminator, so we don't want to copy it */
80         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
81         struct calling_interface_structure *table =
82                 container_of(dm, struct calling_interface_structure, header);
83
84         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
85            6 bytes of entry */
86
87         if (dm->length < 17)
88                 return;
89
90         da_command_address = table->cmdIOAddress;
91         da_command_code = table->cmdIOCode;
92
93         da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
94                              sizeof(struct calling_interface_token),
95                              GFP_KERNEL);
96
97         if (!da_tokens)
98                 return;
99
100         memcpy(da_tokens+da_num_tokens, table->tokens,
101                sizeof(struct calling_interface_token) * tokens);
102
103         da_num_tokens += tokens;
104 }
105
106 static void find_tokens(const struct dmi_header *dm)
107 {
108         switch (dm->type) {
109         case 0xd4: /* Indexed IO */
110                 break;
111         case 0xd5: /* Protected Area Type 1 */
112                 break;
113         case 0xd6: /* Protected Area Type 2 */
114                 break;
115         case 0xda: /* Calling interface */
116                 parse_da_table(dm);
117                 break;
118         }
119 }
120
121 static int find_token_location(int tokenid)
122 {
123         int i;
124         for (i = 0; i < da_num_tokens; i++) {
125                 if (da_tokens[i].tokenID == tokenid)
126                         return da_tokens[i].location;
127         }
128
129         return -1;
130 }
131
132 static struct calling_interface_buffer *
133 dell_send_request(struct calling_interface_buffer *buffer, int class,
134                   int select)
135 {
136         struct smi_cmd command;
137
138         command.magic = SMI_CMD_MAGIC;
139         command.command_address = da_command_address;
140         command.command_code = da_command_code;
141         command.ebx = virt_to_phys(buffer);
142         command.ecx = 0x42534931;
143
144         buffer->class = class;
145         buffer->select = select;
146
147         dcdbas_smi_request(&command);
148
149         return buffer;
150 }
151
152 /* Derived from information in DellWirelessCtl.cpp:
153    Class 17, select 11 is radio control. It returns an array of 32-bit values.
154
155    result[0]: return code
156    result[1]:
157      Bit 0:      Hardware switch supported
158      Bit 1:      Wifi locator supported
159      Bit 2:      Wifi is supported
160      Bit 3:      Bluetooth is supported
161      Bit 4:      WWAN is supported
162      Bit 5:      Wireless keyboard supported
163      Bits 6-7:   Reserved
164      Bit 8:      Wifi is installed
165      Bit 9:      Bluetooth is installed
166      Bit 10:     WWAN is installed
167      Bits 11-15: Reserved
168      Bit 16:     Hardware switch is on
169      Bit 17:     Wifi is blocked
170      Bit 18:     Bluetooth is blocked
171      Bit 19:     WWAN is blocked
172      Bits 20-31: Reserved
173    result[2]: NVRAM size in bytes
174    result[3]: NVRAM format version number
175 */
176
177 static int dell_rfkill_set(int radio, enum rfkill_state state)
178 {
179         struct calling_interface_buffer buffer;
180         int disable = (state == RFKILL_STATE_UNBLOCKED) ? 0 : 1;
181
182         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
183         buffer.input[0] = (1 | (radio<<8) | (disable << 16));
184         dell_send_request(&buffer, 17, 11);
185
186         return 0;
187 }
188
189 static int dell_wifi_set(void *data, enum rfkill_state state)
190 {
191         return dell_rfkill_set(1, state);
192 }
193
194 static int dell_bluetooth_set(void *data, enum rfkill_state state)
195 {
196         return dell_rfkill_set(2, state);
197 }
198
199 static int dell_wwan_set(void *data, enum rfkill_state state)
200 {
201         return dell_rfkill_set(3, state);
202 }
203
204 static int dell_rfkill_get(int bit, enum rfkill_state *state)
205 {
206         struct calling_interface_buffer buffer;
207         int status;
208         int new_state = RFKILL_STATE_HARD_BLOCKED;
209
210         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
211         dell_send_request(&buffer, 17, 11);
212         status = buffer.output[1];
213
214         if (status & (1<<16))
215                 new_state = RFKILL_STATE_SOFT_BLOCKED;
216
217         if (status & (1<<bit))
218                 *state = new_state;
219         else
220                 *state = RFKILL_STATE_UNBLOCKED;
221
222         return 0;
223 }
224
225 static int dell_wifi_get(void *data, enum rfkill_state *state)
226 {
227         return dell_rfkill_get(17, state);
228 }
229
230 static int dell_bluetooth_get(void *data, enum rfkill_state *state)
231 {
232         return dell_rfkill_get(18, state);
233 }
234
235 static int dell_wwan_get(void *data, enum rfkill_state *state)
236 {
237         return dell_rfkill_get(19, state);
238 }
239
240 static int dell_setup_rfkill(void)
241 {
242         struct calling_interface_buffer buffer;
243         int status;
244         int ret;
245
246         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
247         dell_send_request(&buffer, 17, 11);
248         status = buffer.output[1];
249
250         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
251                 wifi_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WLAN);
252                 if (!wifi_rfkill)
253                         goto err_wifi;
254                 wifi_rfkill->name = "dell-wifi";
255                 wifi_rfkill->toggle_radio = dell_wifi_set;
256                 wifi_rfkill->get_state = dell_wifi_get;
257                 ret = rfkill_register(wifi_rfkill);
258                 if (ret)
259                         goto err_wifi;
260         }
261
262         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
263                 bluetooth_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_BLUETOOTH);
264                 if (!bluetooth_rfkill)
265                         goto err_bluetooth;
266                 bluetooth_rfkill->name = "dell-bluetooth";
267                 bluetooth_rfkill->toggle_radio = dell_bluetooth_set;
268                 bluetooth_rfkill->get_state = dell_bluetooth_get;
269                 ret = rfkill_register(bluetooth_rfkill);
270                 if (ret)
271                         goto err_bluetooth;
272         }
273
274         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
275                 wwan_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WWAN);
276                 if (!wwan_rfkill)
277                         goto err_wwan;
278                 wwan_rfkill->name = "dell-wwan";
279                 wwan_rfkill->toggle_radio = dell_wwan_set;
280                 wwan_rfkill->get_state = dell_wwan_get;
281                 ret = rfkill_register(wwan_rfkill);
282                 if (ret)
283                         goto err_wwan;
284         }
285
286         return 0;
287 err_wwan:
288         if (wwan_rfkill)
289                 rfkill_free(wwan_rfkill);
290         if (bluetooth_rfkill) {
291                 rfkill_unregister(bluetooth_rfkill);
292                 bluetooth_rfkill = NULL;
293         }
294 err_bluetooth:
295         if (bluetooth_rfkill)
296                 rfkill_free(bluetooth_rfkill);
297         if (wifi_rfkill) {
298                 rfkill_unregister(wifi_rfkill);
299                 wifi_rfkill = NULL;
300         }
301 err_wifi:
302         if (wifi_rfkill)
303                 rfkill_free(wifi_rfkill);
304
305         return ret;
306 }
307
308 static int dell_send_intensity(struct backlight_device *bd)
309 {
310         struct calling_interface_buffer buffer;
311
312         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
313         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
314         buffer.input[1] = bd->props.brightness;
315
316         if (buffer.input[0] == -1)
317                 return -ENODEV;
318
319         if (power_supply_is_system_supplied() > 0)
320                 dell_send_request(&buffer, 1, 2);
321         else
322                 dell_send_request(&buffer, 1, 1);
323
324         return 0;
325 }
326
327 static int dell_get_intensity(struct backlight_device *bd)
328 {
329         struct calling_interface_buffer buffer;
330
331         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
332         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
333
334         if (buffer.input[0] == -1)
335                 return -ENODEV;
336
337         if (power_supply_is_system_supplied() > 0)
338                 dell_send_request(&buffer, 0, 2);
339         else
340                 dell_send_request(&buffer, 0, 1);
341
342         return buffer.output[1];
343 }
344
345 static struct backlight_ops dell_ops = {
346         .get_brightness = dell_get_intensity,
347         .update_status  = dell_send_intensity,
348 };
349
350 static int __init dell_init(void)
351 {
352         struct calling_interface_buffer buffer;
353         int max_intensity = 0;
354         int ret;
355
356         if (!dmi_check_system(dell_device_table))
357                 return -ENODEV;
358
359         dmi_walk(find_tokens);
360
361         if (!da_tokens)  {
362                 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
363                 return -ENODEV;
364         }
365
366         ret = dell_setup_rfkill();
367
368         if (ret) {
369                 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
370                 goto out;
371         }
372
373 #ifdef CONFIG_ACPI
374         /* In the event of an ACPI backlight being available, don't
375          * register the platform controller.
376          */
377         if (acpi_video_backlight_support())
378                 return 0;
379 #endif
380
381         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
382         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
383
384         if (buffer.input[0] != -1) {
385                 dell_send_request(&buffer, 0, 2);
386                 max_intensity = buffer.output[3];
387         }
388
389         if (max_intensity) {
390                 dell_backlight_device = backlight_device_register(
391                         "dell_backlight",
392                         NULL, NULL,
393                         &dell_ops);
394
395                 if (IS_ERR(dell_backlight_device)) {
396                         ret = PTR_ERR(dell_backlight_device);
397                         dell_backlight_device = NULL;
398                         goto out;
399                 }
400
401                 dell_backlight_device->props.max_brightness = max_intensity;
402                 dell_backlight_device->props.brightness =
403                         dell_get_intensity(dell_backlight_device);
404                 backlight_update_status(dell_backlight_device);
405         }
406
407         return 0;
408 out:
409         if (wifi_rfkill)
410                 rfkill_unregister(wifi_rfkill);
411         if (bluetooth_rfkill)
412                 rfkill_unregister(bluetooth_rfkill);
413         if (wwan_rfkill)
414                 rfkill_unregister(wwan_rfkill);
415         kfree(da_tokens);
416         return ret;
417 }
418
419 static void __exit dell_exit(void)
420 {
421         backlight_device_unregister(dell_backlight_device);
422         if (wifi_rfkill)
423                 rfkill_unregister(wifi_rfkill);
424         if (bluetooth_rfkill)
425                 rfkill_unregister(bluetooth_rfkill);
426         if (wwan_rfkill)
427                 rfkill_unregister(wwan_rfkill);
428 }
429
430 module_init(dell_init);
431 module_exit(dell_exit);
432
433 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
434 MODULE_DESCRIPTION("Dell laptop driver");
435 MODULE_LICENSE("GPL");
436 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");