aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/wm8994-core.c
blob: ec71c936890648c6d89499025246730e127be734 (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
/*
 * wm8994-core.c  --  Device access for Wolfson WM8994
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/machine.h>

#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/pdata.h>
#include <linux/mfd/wm8994/registers.h>

static int wm8994_read(struct wm8994 *wm8994, unsigned short reg,
		       int bytes, void *dest)
{
	int ret, i;
	u16 *buf = dest;

	BUG_ON(bytes % 2);
	BUG_ON(bytes <= 0);

	ret = wm8994->read_dev(wm8994, reg, bytes, dest);
	if (ret < 0)
		return ret;

	for (i = 0; i < bytes / 2; i++) {
		buf[i] = be16_to_cpu(buf[i]);

		dev_vdbg(wm8994->dev, "Read %04x from R%d(0x%x)\n",
			 buf[i], reg + i, reg + i);
	}

	return 0;
}

/**
 * wm8994_reg_read: Read a single WM8994 register.
 *
 * @wm8994: Device to read from.
 * @reg: Register to read.
 */
int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
{
	unsigned short val;
	int ret;

	mutex_lock(&wm8994->io_lock);

	ret = wm8994_read(wm8994, reg, 2, &val);

	mutex_unlock(&wm8994->io_lock);

	if (ret < 0)
		return ret;
	else
		return val;
}
EXPORT_SYMBOL_GPL(wm8994_reg_read);

/**
 * wm8994_bulk_read: Read multiple WM8994 registers
 *
 * @wm8994: Device to read from
 * @reg: First register
 * @count: Number of registers
 * @buf: Buffer to fill.
 */
int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
		     int count, u16 *buf)
{
	int ret;

	mutex_lock(&wm8994->io_lock);

	ret = wm8994_read(wm8994, reg, count * 2, buf);

	mutex_unlock(&wm8994->io_lock);

	return ret;
}
EXPORT_SYMBOL_GPL(wm8994_bulk_read);

static int wm8994_write(struct wm8994 *wm8994, unsigned short reg,
			int bytes, void *src)
{
	u16 *buf = src;
	int i;

	BUG_ON(bytes % 2);
	BUG_ON(bytes <= 0);

	for (i = 0; i < bytes / 2; i++) {
		dev_vdbg(wm8994->dev, "Write %04x to R%d(0x%x)\n",
			 buf[i], reg + i, reg + i);

		buf[i] = cpu_to_be16(buf[i]);
	}

	return wm8994->write_dev(wm8994, reg, bytes, src);
}

/**
 * wm8994_reg_write: Write a single WM8994 register.
 *
 * @wm8994: Device to write to.
 * @reg: Register to write to.
 * @val: Value to write.
 */
int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
		     unsigned short val)
{
	int ret;

	mutex_lock(&wm8994->io_lock);

	ret = wm8994_write(wm8994, reg, 2, &val);

	mutex_unlock(&wm8994->io_lock);

	return ret;
}
EXPORT_SYMBOL_GPL(wm8994_reg_write);

/**
 * wm8994_set_bits: Set the value of a bitfield in a WM8994 register
 *
 * @wm8994: Device to write to.
 * @reg: Register to write to.
 * @mask: Mask of bits to set.
 * @val: Value to set (unshifted)
 */
int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
		    unsigned short mask, unsigned short val)
{
	int ret;
	u16 r;

	mutex_lock(&wm8994->io_lock);

	ret = wm8994_read(wm8994, reg, 2, &r);
	if (ret < 0)
		goto out;

	r &= ~mask;
	r |= val;

	ret = wm8994_write(wm8994, reg, 2, &r);

out:
	mutex_unlock(&wm8994->io_lock);

	return ret;
}
EXPORT_SYMBOL_GPL(wm8994_set_bits);

static struct mfd_cell wm8994_regulator_devs[] = {
	{ .name = "wm8994-ldo", .id = 1 },
	{ .name = "wm8994-ldo", .id = 2 },
};

static struct resource wm8994_codec_resources[] = {
	{
		.start = WM8994_IRQ_TEMP_SHUT,
		.end   = WM8994_IRQ_TEMP_WARN,
		.flags = IORESOURCE_IRQ,
	},
};

static struct resource wm8994_gpio_resources[] = {
	{
		.start = WM8994_IRQ_GPIO(1),
		.end   = WM8994_IRQ_GPIO(11),
		.flags = IORESOURCE_IRQ,
	},
};

static struct mfd_cell wm8994_devs[] = {
	{
		.name = "wm8994-codec",
		.num_resources = ARRAY_SIZE(wm8994_codec_resources),
		.resources = wm8994_codec_resources,
	},

	{
		.name = "wm8994-gpio",
		.num_resources = ARRAY_SIZE(wm8994_gpio_resources),
		.resources = wm8994_gpio_resources,
	},
};

/*
 * Supplies for the main bulk of CODEC; the LDO supplies are ignored
 * and should be handled via the standard regulator API supply
 * management.
 */
static const char *wm8994_main_supplies[] = {
	"DBVDD",
	"DCVDD",
	"AVDD1",
	"AVDD2",
	"CPVDD",
	"SPKVDD1",
	"SPKVDD2",
};

#ifdef CONFIG_PM
static int wm8994_device_suspend(struct device *dev)
{
	struct wm8994 *wm8994 = dev_get_drvdata(dev);
	int ret;

	/* GPIO configuration state is saved here since we may be configuring
	 * the GPIO alternate functions even if we're not using the gpiolib
	 * driver for them.
	 */
	ret = wm8994_read(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2,
			  &wm8994->gpio_regs);
	if (ret < 0)
		dev_err(dev, "Failed to save GPIO registers: %d\n", ret);

	/* For similar reasons we also stash the regulator states */
	ret = wm8994_read(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2,
			  &wm8994->ldo_regs);
	if (ret < 0)
		dev_err(dev, "Failed to save LDO registers: %d\n", ret);

	ret = regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
				     wm8994->supplies);
	if (ret != 0) {
		dev_err(dev, "Failed to disable supplies: %d\n", ret);
		return ret;
	}

	return 0;
}

static int wm8994_device_resume(struct device *dev)
{
	struct wm8994 *wm8994 = dev_get_drvdata(dev);
	int ret;

	ret = regulator_bulk_enable(ARRAY_SIZE(wm8994_main_supplies),
				    wm8994->supplies);
	if (ret != 0) {
		dev_err(dev, "Failed to enable supplies: %d\n", ret);
		return ret;
	}

	ret = wm8994_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK,
			   WM8994_NUM_IRQ_REGS * 2, &wm8994->irq_masks_cur);
	if (ret < 0)
		dev_err(dev, "Failed to restore interrupt masks: %d\n", ret);

	ret = wm8994_write(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2,
			   &wm8994->ldo_regs);
	if (ret < 0)
		dev_err(dev, "Failed to restore LDO registers: %d\n", ret);

	ret = wm8994_write(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2,
			   &wm8994->gpio_regs);
	if (ret < 0)
		dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);

	return 0;
}
#endif

#ifdef CONFIG_REGULATOR
static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
{
	struct wm8994_ldo_pdata *ldo_pdata;

	if (!pdata)
		return 0;

	ldo_pdata = &pdata->ldo[ldo];

	if (!ldo_pdata->init_data)
		return 0;

	return ldo_pdata->init_data->num_consumer_supplies != 0;
}
#else
static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
{
	return 0;
}
#endif

/*
 * Instantiate the generic non-control parts of the device.
 */
static int wm8994_device_init(struct wm8994 *wm8994, unsigned long id, int irq)
{
	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	int ret, i;

	mutex_init(&wm8994->io_lock);
	dev_set_drvdata(wm8994->dev, wm8994);

	/* Add the on-chip regulators first for bootstrapping */
	ret = mfd_add_devices(wm8994->dev, -1,
			      wm8994_regulator_devs,
			      ARRAY_SIZE(wm8994_regulator_devs),
			      NULL, 0);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
		goto err;
	}

	wm8994->supplies = kzalloc(sizeof(struct regulator_bulk_data) *
				   ARRAY_SIZE(wm8994_main_supplies),
				   GFP_KERNEL);
	if (!wm8994->supplies)
		goto err;

	for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
		wm8994->supplies[i].supply = wm8994_main_supplies[i];

	ret = regulator_bulk_get(wm8994->dev, ARRAY_SIZE(wm8994_main_supplies),
				 wm8994->supplies);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
		goto err_supplies;
	}

	ret = regulator_bulk_enable(ARRAY_SIZE(wm8994_main_supplies),
				    wm8994->supplies);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
		goto err_get;
	}

	ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
	if (ret < 0) {
		dev_err(wm8994->dev, "Failed to read ID register\n");
		goto err_enable;
	}
	if (ret != 0x8994) {
		dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
			ret);
		ret = -EINVAL;
		goto err_enable;
	}

	ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
	if (ret < 0) {
		dev_err(wm8994->dev, "Failed to read revision register: %d\n",
			ret);
		goto err_enable;
	}

	switch (ret) {
	case 0:
	case 1:
		dev_warn(wm8994->dev, "revision %c not fully supported\n",
			'A' + ret);
		break;
	default:
		dev_info(wm8994->dev, "revision %c\n", 'A' + ret);
		break;
	}


	if (pdata) {
		wm8994->irq_base = pdata->irq_base;
		wm8994->gpio_base = pdata->gpio_base;

		/* GPIO configuration is only applied if it's non-zero */
		for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
			if (pdata->gpio_defaults[i]) {
				wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
						0xffff,
						pdata->gpio_defaults[i]);
			}
		}
	}

	/* In some system designs where the regulators are not in use,
	 * we can achieve a small reduction in leakage currents by
	 * floating LDO outputs.  This bit makes no difference if the
	 * LDOs are enabled, it only affects cases where the LDOs were
	 * in operation and are then disabled.
	 */
	for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
		if (wm8994_ldo_in_use(pdata, i))
			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
					WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
		else
			wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
					WM8994_LDO1_DISCH, 0);
	}

	wm8994_irq_init(wm8994);

	ret = mfd_add_devices(wm8994->dev, -1,
			      wm8994_devs, ARRAY_SIZE(wm8994_devs),
			      NULL, 0);
	if (ret != 0) {
		dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
		goto err_irq;
	}

	return 0;

err_irq:
	wm8994_irq_exit(wm8994);
err_enable:
	regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
			       wm8994->supplies);
err_get:
	regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies);
err_supplies:
	kfree(wm8994->supplies);
err:
	mfd_remove_devices(wm8994->dev);
	kfree(wm8994);
	return ret;
}

static void wm8994_device_exit(struct wm8994 *wm8994)
{
	mfd_remove_devices(wm8994->dev);
	wm8994_irq_exit(wm8994);
	regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
			       wm8994->supplies);
	regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies);
	kfree(wm8994->supplies);
	kfree(wm8994);
}

static int wm8994_i2c_read_device(struct wm8994 *wm8994, unsigned short reg,
				  int bytes, void *dest)
{
	struct i2c_client *i2c = wm8994->control_data;
	int ret;
	u16 r = cpu_to_be16(reg);

	ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
	if (ret < 0)
		return ret;
	if (ret != 2)
		return -EIO;

	ret = i2c_master_recv(i2c, dest, bytes);
	if (ret < 0)
		return ret;
	if (ret != bytes)
		return -EIO;
	return 0;
}

/* Currently we allocate the write buffer on the stack; this is OK for
 * small writes - if we need to do large writes this will need to be
 * revised.
 */
static int wm8994_i2c_write_device(struct wm8994 *wm8994, unsigned short reg,
				   int bytes, void *src)
{
	struct i2c_client *i2c = wm8994->control_data;
	unsigned char msg[bytes + 2];
	int ret;

	reg = cpu_to_be16(reg);
	memcpy(&msg[0], &reg, 2);
	memcpy(&msg[2], src, bytes);

	ret = i2c_master_send(i2c, msg, bytes + 2);
	if (ret < 0)
		return ret;
	if (ret < bytes + 2)
		return -EIO;

	return 0;
}

static int wm8994_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct wm8994 *wm8994;

	wm8994 = kzalloc(sizeof(struct wm8994), GFP_KERNEL);
	if (wm8994 == NULL) {
		kfree(i2c);
		return -ENOMEM;
	}

	i2c_set_clientdata(i2c, wm8994);
	wm8994->dev = &i2c->dev;
	wm8994->control_data = i2c;
	wm8994->read_dev = wm8994_i2c_read_device;
	wm8994->write_dev = wm8994_i2c_write_device;
	wm8994->irq = i2c->irq;

	return wm8994_device_init(wm8994, id->driver_data, i2c->irq);
}

static int wm8994_i2c_remove(struct i2c_client *i2c)
{
	struct wm8994 *wm8994 = i2c_get_clientdata(i2c);

	wm8994_device_exit(wm8994);

	return 0;
}

#ifdef CONFIG_PM
static int wm8994_i2c_suspend(struct i2c_client *i2c, pm_message_t state)
{
	return wm8994_device_suspend(&i2c->dev);
}

static int wm8994_i2c_resume(struct i2c_client *i2c)
{
	return wm8994_device_resume(&i2c->dev);
}
#else
#define wm8994_i2c_suspend NULL
#define wm8994_i2c_resume NULL
#endif

static const struct i2c_device_id wm8994_i2c_id[] = {
	{ "wm8994", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);

static struct i2c_driver wm8994_i2c_driver = {
	.driver = {
		   .name = "wm8994",
		   .owner = THIS_MODULE,
	},
	.probe = wm8994_i2c_probe,
	.remove = wm8994_i2c_remove,
	.suspend = wm8994_i2c_suspend,
	.resume = wm8994_i2c_resume,
	.id_table = wm8994_i2c_id,
};

static int __init wm8994_i2c_init(void)
{
	int ret;

	ret = i2c_add_driver(&wm8994_i2c_driver);
	if (ret != 0)
		pr_err("Failed to register wm8994 I2C driver: %d\n", ret);

	return ret;
}
module_init(wm8994_i2c_init);

static void __exit wm8994_i2c_exit(void)
{
	i2c_del_driver(&wm8994_i2c_driver);
}
module_exit(wm8994_i2c_exit);

MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");