aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/wm8350-core.c
blob: 4ab527f5c53b65ff2872ba07fcef30982a390f3a (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
/*
 * wm8350-core.c  --  Device access for Wolfson WM8350
 *
 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
 *
 * Author: Liam Girdwood, Mark Brown
 *
 *  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/bug.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/regmap.h>
#include <linux/workqueue.h>

#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/audio.h>
#include <linux/mfd/wm8350/comparator.h>
#include <linux/mfd/wm8350/gpio.h>
#include <linux/mfd/wm8350/pmic.h>
#include <linux/mfd/wm8350/rtc.h>
#include <linux/mfd/wm8350/supply.h>
#include <linux/mfd/wm8350/wdt.h>

#define WM8350_CLOCK_CONTROL_1		0x28
#define WM8350_AIF_TEST			0x74

/* debug */
#define WM8350_BUS_DEBUG 0
#if WM8350_BUS_DEBUG
#define dump(regs, src) do { \
	int i_; \
	u16 *src_ = src; \
	printk(KERN_DEBUG); \
	for (i_ = 0; i_ < regs; i_++) \
		printk(" 0x%4.4x", *src_++); \
	printk("\n"); \
} while (0);
#else
#define dump(bytes, src)
#endif

#define WM8350_LOCK_DEBUG 0
#if WM8350_LOCK_DEBUG
#define ldbg(format, arg...) printk(format, ## arg)
#else
#define ldbg(format, arg...)
#endif

/*
 * WM8350 Device IO
 */
static DEFINE_MUTEX(reg_lock_mutex);

/*
 * Safe read, modify, write methods
 */
int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
{
	return regmap_update_bits(wm8350->regmap, reg, mask, 0);
}
EXPORT_SYMBOL_GPL(wm8350_clear_bits);

int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
{
	return regmap_update_bits(wm8350->regmap, reg, mask, mask);
}
EXPORT_SYMBOL_GPL(wm8350_set_bits);

u16 wm8350_reg_read(struct wm8350 *wm8350, int reg)
{
	unsigned int data;
	int err;

	err = regmap_read(wm8350->regmap, reg, &data);
	if (err)
		dev_err(wm8350->dev, "read from reg R%d failed\n", reg);

	return data;
}
EXPORT_SYMBOL_GPL(wm8350_reg_read);

int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val)
{
	int ret;

	ret = regmap_write(wm8350->regmap, reg, val);

	if (ret)
		dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
	return ret;
}
EXPORT_SYMBOL_GPL(wm8350_reg_write);

int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs,
		      u16 *dest)
{
	int err = 0;

	err = regmap_bulk_read(wm8350->regmap, start_reg, dest, regs);
	if (err)
		dev_err(wm8350->dev, "block read starting from R%d failed\n",
			start_reg);

	return err;
}
EXPORT_SYMBOL_GPL(wm8350_block_read);

int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
		       u16 *src)
{
	int ret = 0;

	ret = regmap_bulk_write(wm8350->regmap, start_reg, src, regs);
	if (ret)
		dev_err(wm8350->dev, "block write starting at R%d failed\n",
			start_reg);

	return ret;
}
EXPORT_SYMBOL_GPL(wm8350_block_write);

/**
 * wm8350_reg_lock()
 *
 * The WM8350 has a hardware lock which can be used to prevent writes to
 * some registers (generally those which can cause particularly serious
 * problems if misused).  This function enables that lock.
 */
int wm8350_reg_lock(struct wm8350 *wm8350)
{
	int ret;

	mutex_lock(&reg_lock_mutex);

	ldbg(__func__);

	ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY);
	if (ret)
		dev_err(wm8350->dev, "lock failed\n");

	wm8350->unlocked = false;

	mutex_unlock(&reg_lock_mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(wm8350_reg_lock);

/**
 * wm8350_reg_unlock()
 *
 * The WM8350 has a hardware lock which can be used to prevent writes to
 * some registers (generally those which can cause particularly serious
 * problems if misused).  This function disables that lock so updates
 * can be performed.  For maximum safety this should be done only when
 * required.
 */
int wm8350_reg_unlock(struct wm8350 *wm8350)
{
	int ret;

	mutex_lock(&reg_lock_mutex);

	ldbg(__func__);

	ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY);
	if (ret)
		dev_err(wm8350->dev, "unlock failed\n");

	wm8350->unlocked = true;

	mutex_unlock(&reg_lock_mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(wm8350_reg_unlock);

int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
{
	u16 reg, result = 0;

	if (channel < WM8350_AUXADC_AUX1 || channel > WM8350_AUXADC_TEMP)
		return -EINVAL;
	if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP
	    && (scale != 0 || vref != 0))
		return -EINVAL;

	mutex_lock(&wm8350->auxadc_mutex);

	/* Turn on the ADC */
	reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
	wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5, reg | WM8350_AUXADC_ENA);

	if (scale || vref) {
		reg = scale << 13;
		reg |= vref << 12;
		wm8350_reg_write(wm8350, WM8350_AUX1_READBACK + channel, reg);
	}

	reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
	reg |= 1 << channel | WM8350_AUXADC_POLL;
	wm8350_reg_write(wm8350, WM8350_DIGITISER_CONTROL_1, reg);

	/* If a late IRQ left the completion signalled then consume
	 * the completion. */
	try_wait_for_completion(&wm8350->auxadc_done);

	/* We ignore the result of the completion and just check for a
	 * conversion result, allowing us to soldier on if the IRQ
	 * infrastructure is not set up for the chip. */
	wait_for_completion_timeout(&wm8350->auxadc_done, msecs_to_jiffies(5));

	reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
	if (reg & WM8350_AUXADC_POLL)
		dev_err(wm8350->dev, "adc chn %d read timeout\n", channel);
	else
		result = wm8350_reg_read(wm8350,
					 WM8350_AUX1_READBACK + channel);

	/* Turn off the ADC */
	reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
	wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5,
			 reg & ~WM8350_AUXADC_ENA);

	mutex_unlock(&wm8350->auxadc_mutex);

	return result & WM8350_AUXADC_DATA1_MASK;
}
EXPORT_SYMBOL_GPL(wm8350_read_auxadc);

static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data)
{
	struct wm8350 *wm8350 = irq_data;

	complete(&wm8350->auxadc_done);

	return IRQ_HANDLED;
}

/*
 * Register a client device.  This is non-fatal since there is no need to
 * fail the entire device init due to a single platform device failing.
 */
static void wm8350_client_dev_register(struct wm8350 *wm8350,
				       const char *name,
				       struct platform_device **pdev)
{
	int ret;

	*pdev = platform_device_alloc(name, -1);
	if (*pdev == NULL) {
		dev_err(wm8350->dev, "Failed to allocate %s\n", name);
		return;
	}

	(*pdev)->dev.parent = wm8350->dev;
	platform_set_drvdata(*pdev, wm8350);
	ret = platform_device_add(*pdev);
	if (ret != 0) {
		dev_err(wm8350->dev, "Failed to register %s: %d\n", name, ret);
		platform_device_put(*pdev);
		*pdev = NULL;
	}
}

int wm8350_device_init(struct wm8350 *wm8350, int irq,
		       struct wm8350_platform_data *pdata)
{
	int ret;
	unsigned int id1, id2, mask_rev;
	unsigned int cust_id, mode, chip_rev;

	dev_set_drvdata(wm8350->dev, wm8350);

	/* get WM8350 revision and config mode */
	ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1);
	if (ret != 0) {
		dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
		goto err;
	}

	ret = regmap_read(wm8350->regmap, WM8350_ID, &id2);
	if (ret != 0) {
		dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
		goto err;
	}

	ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev);
	if (ret != 0) {
		dev_err(wm8350->dev, "Failed to read revision: %d\n", ret);
		goto err;
	}

	if (id1 != 0x6143) {
		dev_err(wm8350->dev,
			"Device with ID %x is not a WM8350\n", id1);
		ret = -ENODEV;
		goto err;
	}

	mode = id2 & WM8350_CONF_STS_MASK >> 10;
	cust_id = id2 & WM8350_CUST_ID_MASK;
	chip_rev = (id2 & WM8350_CHIP_REV_MASK) >> 12;
	dev_info(wm8350->dev,
		 "CONF_STS %d, CUST_ID %d, MASK_REV %d, CHIP_REV %d\n",
		 mode, cust_id, mask_rev, chip_rev);

	if (cust_id != 0) {
		dev_err(wm8350->dev, "Unsupported CUST_ID\n");
		ret = -ENODEV;
		goto err;
	}

	switch (mask_rev) {
	case 0:
		wm8350->pmic.max_dcdc = WM8350_DCDC_6;
		wm8350->pmic.max_isink = WM8350_ISINK_B;

		switch (chip_rev) {
		case WM8350_REV_E:
			dev_info(wm8350->dev, "WM8350 Rev E\n");
			break;
		case WM8350_REV_F:
			dev_info(wm8350->dev, "WM8350 Rev F\n");
			break;
		case WM8350_REV_G:
			dev_info(wm8350->dev, "WM8350 Rev G\n");
			wm8350->power.rev_g_coeff = 1;
			break;
		case WM8350_REV_H:
			dev_info(wm8350->dev, "WM8350 Rev H\n");
			wm8350->power.rev_g_coeff = 1;
			break;
		default:
			/* For safety we refuse to run on unknown hardware */
			dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n");
			ret = -ENODEV;
			goto err;
		}
		break;

	case 1:
		wm8350->pmic.max_dcdc = WM8350_DCDC_4;
		wm8350->pmic.max_isink = WM8350_ISINK_A;

		switch (chip_rev) {
		case 0:
			dev_info(wm8350->dev, "WM8351 Rev A\n");
			wm8350->power.rev_g_coeff = 1;
			break;

		case 1:
			dev_info(wm8350->dev, "WM8351 Rev B\n");
			wm8350->power.rev_g_coeff = 1;
			break;

		default:
			dev_err(wm8350->dev, "Unknown WM8351 CHIP_REV\n");
			ret = -ENODEV;
			goto err;
		}
		break;

	case 2:
		wm8350->pmic.max_dcdc = WM8350_DCDC_6;
		wm8350->pmic.max_isink = WM8350_ISINK_B;

		switch (chip_rev) {
		case 0:
			dev_info(wm8350->dev, "WM8352 Rev A\n");
			wm8350->power.rev_g_coeff = 1;
			break;

		default:
			dev_err(wm8350->dev, "Unknown WM8352 CHIP_REV\n");
			ret = -ENODEV;
			goto err;
		}
		break;

	default:
		dev_err(wm8350->dev, "Unknown MASK_REV\n");
		ret = -ENODEV;
		goto err;
	}

	mutex_init(&wm8350->auxadc_mutex);
	init_completion(&wm8350->auxadc_done);

	ret = wm8350_irq_init(wm8350, irq, pdata);
	if (ret < 0)
		goto err;

	if (wm8350->irq_base) {
		ret = request_threaded_irq(wm8350->irq_base +
					   WM8350_IRQ_AUXADC_DATARDY,
					   NULL, wm8350_auxadc_irq, 0,
					   "auxadc", wm8350);
		if (ret < 0)
			dev_warn(wm8350->dev,
				 "Failed to request AUXADC IRQ: %d\n", ret);
	}

	if (pdata && pdata->init) {
		ret = pdata->init(wm8350);
		if (ret != 0) {
			dev_err(wm8350->dev, "Platform init() failed: %d\n",
				ret);
			goto err_irq;
		}
	}

	wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0x0);

	wm8350_client_dev_register(wm8350, "wm8350-codec",
				   &(wm8350->codec.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-gpio",
				   &(wm8350->gpio.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-hwmon",
				   &(wm8350->hwmon.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-power",
				   &(wm8350->power.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-rtc", &(wm8350->rtc.pdev));
	wm8350_client_dev_register(wm8350, "wm8350-wdt", &(wm8350->wdt.pdev));

	return 0;

err_irq:
	wm8350_irq_exit(wm8350);
err:
	return ret;
}
EXPORT_SYMBOL_GPL(wm8350_device_init);

void wm8350_device_exit(struct wm8350 *wm8350)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(wm8350->pmic.led); i++)
		platform_device_unregister(wm8350->pmic.led[i].pdev);

	for (i = 0; i < ARRAY_SIZE(wm8350->pmic.pdev); i++)
		platform_device_unregister(wm8350->pmic.pdev[i]);

	platform_device_unregister(wm8350->wdt.pdev);
	platform_device_unregister(wm8350->rtc.pdev);
	platform_device_unregister(wm8350->power.pdev);
	platform_device_unregister(wm8350->hwmon.pdev);
	platform_device_unregister(wm8350->gpio.pdev);
	platform_device_unregister(wm8350->codec.pdev);

	if (wm8350->irq_base)
		free_irq(wm8350->irq_base + WM8350_IRQ_AUXADC_DATARDY, wm8350);

	wm8350_irq_exit(wm8350);
}
EXPORT_SYMBOL_GPL(wm8350_device_exit);

MODULE_DESCRIPTION("WM8350 AudioPlus PMIC core driver");
MODULE_LICENSE("GPL");