aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/misc/dell-laptop.c
blob: 4d33a2068b7a76ec5738d0162a2816a92e4d1c88 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
/*
 *  Driver for Dell laptop extras
 *
 *  Copyright (c) Red Hat <mjg@redhat.com>
 *
 *  Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
 *  Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/dmi.h>
#include <linux/io.h>
#include <linux/rfkill.h>
#include <linux/power_supply.h>
#include <linux/acpi.h>
#include "../firmware/dcdbas.h"

#define BRIGHTNESS_TOKEN 0x7d

/* This structure will be modified by the firmware when we enter
 * system management mode, hence the volatiles */

struct calling_interface_buffer {
	u16 class;
	u16 select;
	volatile u32 input[4];
	volatile u32 output[4];
} __packed;

struct calling_interface_token {
	u16 tokenID;
	u16 location;
	union {
		u16 value;
		u16 stringlength;
	};
};

struct calling_interface_structure {
	struct dmi_header header;
	u16 cmdIOAddress;
	u8 cmdIOCode;
	u32 supportedCmds;
	struct calling_interface_token tokens[];
} __packed;

static int da_command_address;
static int da_command_code;
static int da_num_tokens;
static struct calling_interface_token *da_tokens;

static struct backlight_device *dell_backlight_device;
static struct rfkill *wifi_rfkill;
static struct rfkill *bluetooth_rfkill;
static struct rfkill *wwan_rfkill;

static const struct dmi_system_id __initdata dell_device_table[] = {
	{
		.ident = "Dell laptop",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
		},
	},
	{ }
};

static void parse_da_table(const struct dmi_header *dm)
{
	/* Final token is a terminator, so we don't want to copy it */
	int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
	struct calling_interface_structure *table =
		container_of(dm, struct calling_interface_structure, header);

	/* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
	   6 bytes of entry */

	if (dm->length < 17)
		return;

	da_command_address = table->cmdIOAddress;
	da_command_code = table->cmdIOCode;

	da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
			     sizeof(struct calling_interface_token),
			     GFP_KERNEL);

	if (!da_tokens)
		return;

	memcpy(da_tokens+da_num_tokens, table->tokens,
	       sizeof(struct calling_interface_token) * tokens);

	da_num_tokens += tokens;
}

static void find_tokens(const struct dmi_header *dm)
{
	switch (dm->type) {
	case 0xd4: /* Indexed IO */
		break;
	case 0xd5: /* Protected Area Type 1 */
		break;
	case 0xd6: /* Protected Area Type 2 */
		break;
	case 0xda: /* Calling interface */
		parse_da_table(dm);
		break;
	}
}

static int find_token_location(int tokenid)
{
	int i;
	for (i = 0; i < da_num_tokens; i++) {
		if (da_tokens[i].tokenID == tokenid)
			return da_tokens[i].location;
	}

	return -1;
}

static struct calling_interface_buffer *
dell_send_request(struct calling_interface_buffer *buffer, int class,
		  int select)
{
	struct smi_cmd command;

	command.magic = SMI_CMD_MAGIC;
	command.command_address = da_command_address;
	command.command_code = da_command_code;
	command.ebx = virt_to_phys(buffer);
	command.ecx = 0x42534931;

	buffer->class = class;
	buffer->select = select;

	dcdbas_smi_request(&command);

	return buffer;
}

/* Derived from information in DellWirelessCtl.cpp:
   Class 17, select 11 is radio control. It returns an array of 32-bit values.

   result[0]: return code
   result[1]:
     Bit 0:      Hardware switch supported
     Bit 1:      Wifi locator supported
     Bit 2:      Wifi is supported
     Bit 3:      Bluetooth is supported
     Bit 4:      WWAN is supported
     Bit 5:      Wireless keyboard supported
     Bits 6-7:   Reserved
     Bit 8:      Wifi is installed
     Bit 9:      Bluetooth is installed
     Bit 10:     WWAN is installed
     Bits 11-15: Reserved
     Bit 16:     Hardware switch is on
     Bit 17:     Wifi is blocked
     Bit 18:     Bluetooth is blocked
     Bit 19:     WWAN is blocked
     Bits 20-31: Reserved
   result[2]: NVRAM size in bytes
   result[3]: NVRAM format version number
*/

static int dell_rfkill_set(int radio, enum rfkill_state state)
{
	struct calling_interface_buffer buffer;
	int disable = (state == RFKILL_STATE_UNBLOCKED) ? 0 : 1;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	buffer.input[0] = (1 | (radio<<8) | (disable << 16));
	dell_send_request(&buffer, 17, 11);

	return 0;
}

static int dell_wifi_set(void *data, enum rfkill_state state)
{
	return dell_rfkill_set(1, state);
}

static int dell_bluetooth_set(void *data, enum rfkill_state state)
{
	return dell_rfkill_set(2, state);
}

static int dell_wwan_set(void *data, enum rfkill_state state)
{
	return dell_rfkill_set(3, state);
}

static int dell_rfkill_get(int bit, enum rfkill_state *state)
{
	struct calling_interface_buffer buffer;
	int status;
	int new_state = RFKILL_STATE_HARD_BLOCKED;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	dell_send_request(&buffer, 17, 11);
	status = buffer.output[1];

	if (status & (1<<16))
		new_state = RFKILL_STATE_SOFT_BLOCKED;

	if (status & (1<<bit))
		*state = new_state;
	else
		*state = RFKILL_STATE_UNBLOCKED;

	return 0;
}

static int dell_wifi_get(void *data, enum rfkill_state *state)
{
	return dell_rfkill_get(17, state);
}

static int dell_bluetooth_get(void *data, enum rfkill_state *state)
{
	return dell_rfkill_get(18, state);
}

static int dell_wwan_get(void *data, enum rfkill_state *state)
{
	return dell_rfkill_get(19, state);
}

static int dell_setup_rfkill(void)
{
	struct calling_interface_buffer buffer;
	int status;
	int ret;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	dell_send_request(&buffer, 17, 11);
	status = buffer.output[1];

	if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
		wifi_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WLAN);
		if (!wifi_rfkill)
			goto err_wifi;
		wifi_rfkill->name = "dell-wifi";
		wifi_rfkill->toggle_radio = dell_wifi_set;
		wifi_rfkill->get_state = dell_wifi_get;
		ret = rfkill_register(wifi_rfkill);
		if (ret)
			goto err_wifi;
	}

	if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
		bluetooth_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_BLUETOOTH);
		if (!bluetooth_rfkill)
			goto err_bluetooth;
		bluetooth_rfkill->name = "dell-bluetooth";
		bluetooth_rfkill->toggle_radio = dell_bluetooth_set;
		bluetooth_rfkill->get_state = dell_bluetooth_get;
		ret = rfkill_register(bluetooth_rfkill);
		if (ret)
			goto err_bluetooth;
	}

	if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
		wwan_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WWAN);
		if (!wwan_rfkill)
			goto err_wwan;
		wwan_rfkill->name = "dell-wwan";
		wwan_rfkill->toggle_radio = dell_wwan_set;
		wwan_rfkill->get_state = dell_wwan_get;
		ret = rfkill_register(wwan_rfkill);
		if (ret)
			goto err_wwan;
	}

	return 0;
err_wwan:
	if (wwan_rfkill)
		rfkill_free(wwan_rfkill);
	if (bluetooth_rfkill) {
		rfkill_unregister(bluetooth_rfkill);
		bluetooth_rfkill = NULL;
	}
err_bluetooth:
	if (bluetooth_rfkill)
		rfkill_free(bluetooth_rfkill);
	if (wifi_rfkill) {
		rfkill_unregister(wifi_rfkill);
		wifi_rfkill = NULL;
	}
err_wifi:
	if (wifi_rfkill)
		rfkill_free(wifi_rfkill);

	return ret;
}

static int dell_send_intensity(struct backlight_device *bd)
{
	struct calling_interface_buffer buffer;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
	buffer.input[1] = bd->props.brightness;

	if (buffer.input[0] == -1)
		return -ENODEV;

	if (power_supply_is_system_supplied() > 0)
		dell_send_request(&buffer, 1, 2);
	else
		dell_send_request(&buffer, 1, 1);

	return 0;
}

static int dell_get_intensity(struct backlight_device *bd)
{
	struct calling_interface_buffer buffer;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);

	if (buffer.input[0] == -1)
		return -ENODEV;

	if (power_supply_is_system_supplied() > 0)
		dell_send_request(&buffer, 0, 2);
	else
		dell_send_request(&buffer, 0, 1);

	return buffer.output[1];
}

static struct backlight_ops dell_ops = {
	.get_brightness = dell_get_intensity,
	.update_status  = dell_send_intensity,
};

static int __init dell_init(void)
{
	struct calling_interface_buffer buffer;
	int max_intensity = 0;
	int ret;

	if (!dmi_check_system(dell_device_table))
		return -ENODEV;

	dmi_walk(find_tokens);

	if (!da_tokens)  {
		printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
		return -ENODEV;
	}

	ret = dell_setup_rfkill();

	if (ret) {
		printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
		goto out;
	}

#ifdef CONFIG_ACPI
	/* In the event of an ACPI backlight being available, don't
	 * register the platform controller.
	 */
	if (acpi_video_backlight_support())
		return 0;
#endif

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);

	if (buffer.input[0] != -1) {
		dell_send_request(&buffer, 0, 2);
		max_intensity = buffer.output[3];
	}

	if (max_intensity) {
		dell_backlight_device = backlight_device_register(
			"dell_backlight",
			NULL, NULL,
			&dell_ops);

		if (IS_ERR(dell_backlight_device)) {
			ret = PTR_ERR(dell_backlight_device);
			dell_backlight_device = NULL;
			goto out;
		}

		dell_backlight_device->props.max_brightness = max_intensity;
		dell_backlight_device->props.brightness =
			dell_get_intensity(dell_backlight_device);
		backlight_update_status(dell_backlight_device);
	}

	return 0;
out:
	if (wifi_rfkill)
		rfkill_unregister(wifi_rfkill);
	if (bluetooth_rfkill)
		rfkill_unregister(bluetooth_rfkill);
	if (wwan_rfkill)
		rfkill_unregister(wwan_rfkill);
	kfree(da_tokens);
	return ret;
}

static void __exit dell_exit(void)
{
	backlight_device_unregister(dell_backlight_device);
	if (wifi_rfkill)
		rfkill_unregister(wifi_rfkill);
	if (bluetooth_rfkill)
		rfkill_unregister(bluetooth_rfkill);
	if (wwan_rfkill)
		rfkill_unregister(wwan_rfkill);
}

module_init(dell_init);
module_exit(dell_exit);

MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
MODULE_DESCRIPTION("Dell laptop driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");