summaryrefslogtreecommitdiffstats
path: root/drivers/platform/chrome/chromeos_laptop.c
blob: a04019ab9feb3636dd74d3cf7e1a09764513a5fd (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
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
/*
 *  chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices.
 *
 *  Author : Benson Leung <bleung@chromium.org>
 *
 *  Copyright (C) 2012 Google, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/dmi.h>
#include <linux/i2c.h>
#include <linux/i2c/atmel_mxt_ts.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#define ATMEL_TP_I2C_ADDR	0x4b
#define ATMEL_TP_I2C_BL_ADDR	0x25
#define ATMEL_TS_I2C_ADDR	0x4a
#define ATMEL_TS_I2C_BL_ADDR	0x26
#define CYAPA_TP_I2C_ADDR	0x67
#define ISL_ALS_I2C_ADDR	0x44
#define TAOS_ALS_I2C_ADDR	0x29

#define MAX_I2C_DEVICE_DEFERRALS	5

static struct i2c_client *als;
static struct i2c_client *tp;
static struct i2c_client *ts;

static const char *i2c_adapter_names[] = {
	"SMBus I801 adapter",
	"i915 gmbus vga",
	"i915 gmbus panel",
	"i2c-designware-pci",
	"i2c-designware-pci",
};

/* Keep this enum consistent with i2c_adapter_names */
enum i2c_adapter_type {
	I2C_ADAPTER_SMBUS = 0,
	I2C_ADAPTER_VGADDC,
	I2C_ADAPTER_PANEL,
	I2C_ADAPTER_DESIGNWARE_0,
	I2C_ADAPTER_DESIGNWARE_1,
};

enum i2c_peripheral_state {
	UNPROBED = 0,
	PROBED,
	TIMEDOUT,
};

struct i2c_peripheral {
	int (*add)(enum i2c_adapter_type type);
	enum i2c_adapter_type type;
	enum i2c_peripheral_state state;
	int tries;
};

#define MAX_I2C_PERIPHERALS 3

struct chromeos_laptop {
	struct i2c_peripheral i2c_peripherals[MAX_I2C_PERIPHERALS];
};

static struct chromeos_laptop *cros_laptop;

static struct i2c_board_info cyapa_device = {
	I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR),
	.flags		= I2C_CLIENT_WAKE,
};

static struct i2c_board_info isl_als_device = {
	I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR),
};

static struct i2c_board_info tsl2583_als_device = {
	I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR),
};

static struct i2c_board_info tsl2563_als_device = {
	I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
};

static int mxt_t19_keys[] = {
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	KEY_RESERVED,
	BTN_LEFT
};

static struct mxt_platform_data atmel_224s_tp_platform_data = {
	.irqflags		= IRQF_TRIGGER_FALLING,
	.t19_num_keys		= ARRAY_SIZE(mxt_t19_keys),
	.t19_keymap		= mxt_t19_keys,
};

static struct i2c_board_info atmel_224s_tp_device = {
	I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
	.platform_data = &atmel_224s_tp_platform_data,
	.flags		= I2C_CLIENT_WAKE,
};

static struct mxt_platform_data atmel_1664s_platform_data = {
	.irqflags		= IRQF_TRIGGER_FALLING,
};

static struct i2c_board_info atmel_1664s_device = {
	I2C_BOARD_INFO("atmel_mxt_ts", ATMEL_TS_I2C_ADDR),
	.platform_data = &atmel_1664s_platform_data,
	.flags		= I2C_CLIENT_WAKE,
};

static struct i2c_client *__add_probed_i2c_device(
		const char *name,
		int bus,
		struct i2c_board_info *info,
		const unsigned short *alt_addr_list)
{
	const struct dmi_device *dmi_dev;
	const struct dmi_dev_onboard *dev_data;
	struct i2c_adapter *adapter;
	struct i2c_client *client = NULL;
	const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END };

	if (bus < 0)
		return NULL;
	/*
	 * If a name is specified, look for irq platform information stashed
	 * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware.
	 */
	if (name) {
		dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL);
		if (!dmi_dev) {
			pr_err("%s failed to dmi find device %s.\n",
			       __func__,
			       name);
			return NULL;
		}
		dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data;
		if (!dev_data) {
			pr_err("%s failed to get data from dmi for %s.\n",
			       __func__, name);
			return NULL;
		}
		info->irq = dev_data->instance;
	}

	adapter = i2c_get_adapter(bus);
	if (!adapter) {
		pr_err("%s failed to get i2c adapter %d.\n", __func__, bus);
		return NULL;
	}

	/*
	 * Add the i2c device. If we can't detect it at the primary
	 * address we scan secondary addresses. In any case the client
	 * structure gets assigned primary address.
	 */
	client = i2c_new_probed_device(adapter, info, addr_list, NULL);
	if (!client && alt_addr_list) {
		struct i2c_board_info dummy_info = {
			I2C_BOARD_INFO("dummy", info->addr),
		};
		struct i2c_client *dummy;

		dummy = i2c_new_probed_device(adapter, &dummy_info,
					      alt_addr_list, NULL);
		if (dummy) {
			pr_debug("%s %d-%02x is probed at %02x\n",
				  __func__, bus, info->addr, dummy->addr);
			i2c_unregister_device(dummy);
			client = i2c_new_device(adapter, info);
		}
	}

	if (!client)
		pr_notice("%s failed to register device %d-%02x\n",
			  __func__, bus, info->addr);
	else
		pr_debug("%s added i2c device %d-%02x\n",
			 __func__, bus, info->addr);

	i2c_put_adapter(adapter);
	return client;
}

struct i2c_lookup {
	const char *name;
	int instance;
	int n;
};

static int __find_i2c_adap(struct device *dev, void *data)
{
	struct i2c_lookup *lookup = data;
	static const char *prefix = "i2c-";
	struct i2c_adapter *adapter;

	if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0)
		return 0;
	adapter = to_i2c_adapter(dev);
	if (strncmp(adapter->name, lookup->name, strlen(lookup->name)) == 0 &&
	    lookup->n++ == lookup->instance)
		return 1;
	return 0;
}

static int find_i2c_adapter_num(enum i2c_adapter_type type)
{
	struct device *dev = NULL;
	struct i2c_adapter *adapter;
	struct i2c_lookup lookup;

	memset(&lookup, 0, sizeof(lookup));
	lookup.name = i2c_adapter_names[type];
	lookup.instance = (type == I2C_ADAPTER_DESIGNWARE_1) ? 1 : 0;

	/* find the adapter by name */
	dev = bus_find_device(&i2c_bus_type, NULL, &lookup, __find_i2c_adap);
	if (!dev) {
		/* Adapters may appear later. Deferred probing will retry */
		pr_notice("%s: i2c adapter %s not found on system.\n", __func__,
			  lookup.name);
		return -ENODEV;
	}
	adapter = to_i2c_adapter(dev);
	return adapter->nr;
}

/*
 * Takes a list of addresses in addrs as such :
 * { addr1, ... , addrn, I2C_CLIENT_END };
 * add_probed_i2c_device will use i2c_new_probed_device
 * and probe for devices at all of the addresses listed.
 * Returns NULL if no devices found.
 * See Documentation/i2c/instantiating-devices for more information.
 */
static struct i2c_client *add_probed_i2c_device(
		const char *name,
		enum i2c_adapter_type type,
		struct i2c_board_info *info,
		const unsigned short *addrs)
{
	return __add_probed_i2c_device(name,
				       find_i2c_adapter_num(type),
				       info,
				       addrs);
}

/*
 * Probes for a device at a single address, the one provided by
 * info->addr.
 * Returns NULL if no device found.
 */
static struct i2c_client *add_i2c_device(const char *name,
						enum i2c_adapter_type type,
						struct i2c_board_info *info)
{
	return __add_probed_i2c_device(name,
				       find_i2c_adapter_num(type),
				       info,
				       NULL);
}

static int setup_cyapa_tp(enum i2c_adapter_type type)
{
	if (tp)
		return 0;

	/* add cyapa touchpad */
	tp = add_i2c_device("trackpad", type, &cyapa_device);
	return (!tp) ? -EAGAIN : 0;
}

static int setup_atmel_224s_tp(enum i2c_adapter_type type)
{
	const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
					     I2C_CLIENT_END };
	if (tp)
		return 0;

	/* add atmel mxt touchpad */
	tp = add_probed_i2c_device("trackpad", type,
				   &atmel_224s_tp_device, addr_list);
	return (!tp) ? -EAGAIN : 0;
}

static int setup_atmel_1664s_ts(enum i2c_adapter_type type)
{
	const unsigned short addr_list[] = { ATMEL_TS_I2C_BL_ADDR,
					     I2C_CLIENT_END };
	if (ts)
		return 0;

	/* add atmel mxt touch device */
	ts = add_probed_i2c_device("touchscreen", type,
				   &atmel_1664s_device, addr_list);
	return (!ts) ? -EAGAIN : 0;
}

static int setup_isl29018_als(enum i2c_adapter_type type)
{
	if (als)
		return 0;

	/* add isl29018 light sensor */
	als = add_i2c_device("lightsensor", type, &isl_als_device);
	return (!als) ? -EAGAIN : 0;
}

static int setup_tsl2583_als(enum i2c_adapter_type type)
{
	if (als)
		return 0;

	/* add tsl2583 light sensor */
	als = add_i2c_device(NULL, type, &tsl2583_als_device);
	return (!als) ? -EAGAIN : 0;
}

static int setup_tsl2563_als(enum i2c_adapter_type type)
{
	if (als)
		return 0;

	/* add tsl2563 light sensor */
	als = add_i2c_device(NULL, type, &tsl2563_als_device);
	return (!als) ? -EAGAIN : 0;
}

static int __init chromeos_laptop_dmi_matched(const struct dmi_system_id *id)
{
	cros_laptop = (void *)id->driver_data;
	pr_debug("DMI Matched %s.\n", id->ident);

	/* Indicate to dmi_scan that processing is done. */
	return 1;
}

static int chromeos_laptop_probe(struct platform_device *pdev)
{
	int i;
	int ret = 0;

	for (i = 0; i < MAX_I2C_PERIPHERALS; i++) {
		struct i2c_peripheral *i2c_dev;

		i2c_dev = &cros_laptop->i2c_peripherals[i];

		/* No more peripherals. */
		if (i2c_dev->add == NULL)
			break;

		if (i2c_dev->state == TIMEDOUT || i2c_dev->state == PROBED)
			continue;

		/*
		 * Check that the i2c adapter is present.
		 * -EPROBE_DEFER if missing as the adapter may appear much
		 * later.
		 */
		if (find_i2c_adapter_num(i2c_dev->type) == -ENODEV) {
			ret = -EPROBE_DEFER;
			continue;
		}

		/* Add the device. */
		if (i2c_dev->add(i2c_dev->type) == -EAGAIN) {
			/*
			 * Set -EPROBE_DEFER a limited num of times
			 * if device is not successfully added.
			 */
			if (++i2c_dev->tries < MAX_I2C_DEVICE_DEFERRALS) {
				ret = -EPROBE_DEFER;
			} else {
				/* Ran out of tries. */
				pr_notice("%s: Ran out of tries for device.\n",
					  __func__);
				i2c_dev->state = TIMEDOUT;
			}
		} else {
			i2c_dev->state = PROBED;
		}
	}

	return ret;
}

static struct chromeos_laptop samsung_series_5_550 = {
	.i2c_peripherals = {
		/* Touchpad. */
		{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
		/* Light Sensor. */
		{ .add = setup_isl29018_als, I2C_ADAPTER_SMBUS },
	},
};

static struct chromeos_laptop samsung_series_5 = {
	.i2c_peripherals = {
		/* Light Sensor. */
		{ .add = setup_tsl2583_als, I2C_ADAPTER_SMBUS },
	},
};

static struct chromeos_laptop chromebook_pixel = {
	.i2c_peripherals = {
		/* Touch Screen. */
		{ .add = setup_atmel_1664s_ts, I2C_ADAPTER_PANEL },
		/* Touchpad. */
		{ .add = setup_atmel_224s_tp, I2C_ADAPTER_VGADDC },
		/* Light Sensor. */
		{ .add = setup_isl29018_als, I2C_ADAPTER_PANEL },
	},
};

static struct chromeos_laptop hp_chromebook_14 = {
	.i2c_peripherals = {
		/* Touchpad. */
		{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
	},
};

static struct chromeos_laptop dell_chromebook_11 = {
	.i2c_peripherals = {
		/* Touchpad. */
		{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
	},
};

static struct chromeos_laptop toshiba_cb35 = {
	.i2c_peripherals = {
		/* Touchpad. */
		{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
	},
};

static struct chromeos_laptop acer_c7_chromebook = {
	.i2c_peripherals = {
		/* Touchpad. */
		{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
	},
};

static struct chromeos_laptop acer_ac700 = {
	.i2c_peripherals = {
		/* Light Sensor. */
		{ .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
	},
};

static struct chromeos_laptop acer_c720 = {
	.i2c_peripherals = {
		/* Touchscreen. */
		{ .add = setup_atmel_1664s_ts, I2C_ADAPTER_DESIGNWARE_1 },
		/* Touchpad. */
		{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
		/* Light Sensor. */
		{ .add = setup_isl29018_als, I2C_ADAPTER_DESIGNWARE_1 },
	},
};

static struct chromeos_laptop hp_pavilion_14_chromebook = {
	.i2c_peripherals = {
		/* Touchpad. */
		{ .add = setup_cyapa_tp, I2C_ADAPTER_SMBUS },
	},
};

static struct chromeos_laptop cr48 = {
	.i2c_peripherals = {
		/* Light Sensor. */
		{ .add = setup_tsl2563_als, I2C_ADAPTER_SMBUS },
	},
};

#define _CBDD(board_) \
	.callback = chromeos_laptop_dmi_matched, \
	.driver_data = (void *)&board_

static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
	{
		.ident = "Samsung Series 5 550",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"),
		},
		_CBDD(samsung_series_5_550),
	},
	{
		.ident = "Samsung Series 5",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
		},
		_CBDD(samsung_series_5),
	},
	{
		.ident = "Chromebook Pixel",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
		},
		_CBDD(chromebook_pixel),
	},
	{
		.ident = "Wolf",
		.matches = {
			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"),
		},
		_CBDD(dell_chromebook_11),
	},
	{
		.ident = "HP Chromebook 14",
		.matches = {
			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Falco"),
		},
		_CBDD(hp_chromebook_14),
	},
	{
		.ident = "Toshiba CB35",
		.matches = {
			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
		},
		_CBDD(toshiba_cb35),
	},
	{
		.ident = "Acer C7 Chromebook",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"),
		},
		_CBDD(acer_c7_chromebook),
	},
	{
		.ident = "Acer AC700",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
		},
		_CBDD(acer_ac700),
	},
	{
		.ident = "Acer C720",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
		},
		_CBDD(acer_c720),
	},
	{
		.ident = "HP Pavilion 14 Chromebook",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"),
		},
		_CBDD(hp_pavilion_14_chromebook),
	},
	{
		.ident = "Cr-48",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
		},
		_CBDD(cr48),
	},
	{ }
};
MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);

static struct platform_device *cros_platform_device;

static struct platform_driver cros_platform_driver = {
	.driver = {
		.name = "chromeos_laptop",
	},
	.probe = chromeos_laptop_probe,
};

static int __init chromeos_laptop_init(void)
{
	int ret;

	if (!dmi_check_system(chromeos_laptop_dmi_table)) {
		pr_debug("%s unsupported system.\n", __func__);
		return -ENODEV;
	}

	ret = platform_driver_register(&cros_platform_driver);
	if (ret)
		return ret;

	cros_platform_device = platform_device_alloc("chromeos_laptop", -1);
	if (!cros_platform_device) {
		ret = -ENOMEM;
		goto fail_platform_device1;
	}

	ret = platform_device_add(cros_platform_device);
	if (ret)
		goto fail_platform_device2;

	return 0;

fail_platform_device2:
	platform_device_put(cros_platform_device);
fail_platform_device1:
	platform_driver_unregister(&cros_platform_driver);
	return ret;
}

static void __exit chromeos_laptop_exit(void)
{
	if (als)
		i2c_unregister_device(als);
	if (tp)
		i2c_unregister_device(tp);
	if (ts)
		i2c_unregister_device(ts);

	platform_device_unregister(cros_platform_device);
	platform_driver_unregister(&cros_platform_driver);
}

module_init(chromeos_laptop_init);
module_exit(chromeos_laptop_exit);

MODULE_DESCRIPTION("Chrome OS Laptop driver");
MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
MODULE_LICENSE("GPL");