summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/wm8400-core.c
blob: 237764ae5f9bdb8deaa5a276e4cd902dcfa065a5 (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
/*
 * Core driver for WM8400.
 *
 * Copyright 2008 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/module.h>
#include <linux/bug.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/mfd/wm8400-private.h>
#include <linux/mfd/wm8400-audio.h>
#include <linux/regmap.h>
#include <linux/slab.h>

static struct {
	u16  readable;    /* Mask of readable bits */
	u16  writable;    /* Mask of writable bits */
	u16  vol;         /* Mask of volatile bits */
	int  is_codec;    /* Register controlled by codec reset */
	u16  default_val; /* Value on reset */
} reg_data[] = {
	{ 0xFFFF, 0xFFFF, 0x0000, 0, 0x6172 }, /* R0 */
	{ 0x7000, 0x0000, 0x8000, 0, 0x0000 }, /* R1 */
	{ 0xFF17, 0xFF17, 0x0000, 0, 0x0000 }, /* R2 */
	{ 0xEBF3, 0xEBF3, 0x0000, 1, 0x6000 }, /* R3 */
	{ 0x3CF3, 0x3CF3, 0x0000, 1, 0x0000 }, /* R4  */
	{ 0xF1F8, 0xF1F8, 0x0000, 1, 0x4050 }, /* R5  */
	{ 0xFC1F, 0xFC1F, 0x0000, 1, 0x4000 }, /* R6  */
	{ 0xDFDE, 0xDFDE, 0x0000, 1, 0x01C8 }, /* R7  */
	{ 0xFCFC, 0xFCFC, 0x0000, 1, 0x0000 }, /* R8  */
	{ 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R9  */
	{ 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R10 */
	{ 0x27F7, 0x27F7, 0x0000, 1, 0x0004 }, /* R11 */
	{ 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R12 */
	{ 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R13 */
	{ 0x1FEF, 0x1FEF, 0x0000, 1, 0x0000 }, /* R14 */
	{ 0x0163, 0x0163, 0x0000, 1, 0x0100 }, /* R15 */
	{ 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R16 */
	{ 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R17 */
	{ 0x1FFF, 0x0FFF, 0x0000, 1, 0x0000 }, /* R18 */
	{ 0xFFFF, 0xFFFF, 0x0000, 1, 0x1000 }, /* R19 */
	{ 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R20 */
	{ 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R21 */
	{ 0x0FDD, 0x0FDD, 0x0000, 1, 0x8000 }, /* R22 */
	{ 0x1FFF, 0x1FFF, 0x0000, 1, 0x0800 }, /* R23 */
	{ 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R24 */
	{ 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R25 */
	{ 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R26 */
	{ 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R27 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R28 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R29 */
	{ 0x0000, 0x0077, 0x0000, 1, 0x0066 }, /* R30 */
	{ 0x0000, 0x0033, 0x0000, 1, 0x0022 }, /* R31 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R32 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R33 */
	{ 0x0000, 0x0003, 0x0000, 1, 0x0003 }, /* R34 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0003 }, /* R35 */
	{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R36 */
	{ 0x0000, 0x003F, 0x0000, 1, 0x0100 }, /* R37 */
	{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R38 */
	{ 0x0000, 0x000F, 0x0000, 0, 0x0000 }, /* R39 */
	{ 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R40 */
	{ 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R41 */
	{ 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R42 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R43 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R44 */
	{ 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R45 */
	{ 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R46 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R47 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R48 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R49 */
	{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R50 */
	{ 0x0000, 0x01B3, 0x0000, 1, 0x0180 }, /* R51 */
	{ 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R52 */
	{ 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R53 */
	{ 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R54 */
	{ 0x0000, 0x0001, 0x0000, 1, 0x0000 }, /* R55 */
	{ 0x0000, 0x003F, 0x0000, 1, 0x0000 }, /* R56 */
	{ 0x0000, 0x004F, 0x0000, 1, 0x0000 }, /* R57 */
	{ 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R58 */
	{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R59 */
	{ 0x1FFF, 0x1FFF, 0x0000, 1, 0x0000 }, /* R60 */
	{ 0xFFFF, 0xFFFF, 0x0000, 1, 0x0000 }, /* R61 */
	{ 0x03FF, 0x03FF, 0x0000, 1, 0x0000 }, /* R62 */
	{ 0x007F, 0x007F, 0x0000, 1, 0x0000 }, /* R63 */
	{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R64 */
	{ 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R65 */
	{ 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R66 */
	{ 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R67 */
	{ 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R68 */
	{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R69 */
	{ 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R70 */
	{ 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R71 */
	{ 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R72 */
	{ 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R73 */
	{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R74 */
	{ 0x000E, 0x000E, 0x0000, 0, 0x0008 }, /* R75 */
	{ 0xE00F, 0xE00F, 0x0000, 0, 0x0000 }, /* R76 */
	{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R77 */
	{ 0x03C0, 0x03C0, 0x0000, 0, 0x02C0 }, /* R78 */
	{ 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R79 */
	{ 0xFFFF, 0xFFFF, 0x0000, 0, 0x0000 }, /* R80 */
	{ 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R81 */
	{ 0x2BFF, 0x0000, 0xffff, 0, 0x0000 }, /* R82 */
	{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R83 */
	{ 0x80FF, 0x80FF, 0x0000, 0, 0x00ff }, /* R84 */
};

static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest)
{
	int i, ret = 0;

	BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache));

	/* If there are any volatile reads then read back the entire block */
	for (i = reg; i < reg + num_regs; i++)
		if (reg_data[i].vol) {
			ret = regmap_bulk_read(wm8400->regmap, reg, dest,
					       num_regs);
			return ret;
		}

	/* Otherwise use the cache */
	memcpy(dest, &wm8400->reg_cache[reg], num_regs * sizeof(u16));

	return 0;
}

static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs,
			u16 *src)
{
	int ret, i;

	BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache));

	for (i = 0; i < num_regs; i++) {
		BUG_ON(!reg_data[reg + i].writable);
		wm8400->reg_cache[reg + i] = src[i];
		ret = regmap_write(wm8400->regmap, reg, src[i]);
		if (ret != 0)
			return ret;
	}

	return 0;
}

/**
 * wm8400_reg_read - Single register read
 *
 * @wm8400: Pointer to wm8400 control structure
 * @reg:    Register to read
 *
 * @return  Read value
 */
u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg)
{
	u16 val;

	mutex_lock(&wm8400->io_lock);

	wm8400_read(wm8400, reg, 1, &val);

	mutex_unlock(&wm8400->io_lock);

	return val;
}
EXPORT_SYMBOL_GPL(wm8400_reg_read);

int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data)
{
	int ret;

	mutex_lock(&wm8400->io_lock);

	ret = wm8400_read(wm8400, reg, count, data);

	mutex_unlock(&wm8400->io_lock);

	return ret;
}
EXPORT_SYMBOL_GPL(wm8400_block_read);

/**
 * wm8400_set_bits - Bitmask write
 *
 * @wm8400: Pointer to wm8400 control structure
 * @reg:    Register to access
 * @mask:   Mask of bits to change
 * @val:    Value to set for masked bits
 */
int wm8400_set_bits(struct wm8400 *wm8400, u8 reg, u16 mask, u16 val)
{
	u16 tmp;
	int ret;

	mutex_lock(&wm8400->io_lock);

	ret = wm8400_read(wm8400, reg, 1, &tmp);
	tmp = (tmp & ~mask) | val;
	if (ret == 0)
		ret = wm8400_write(wm8400, reg, 1, &tmp);

	mutex_unlock(&wm8400->io_lock);

	return ret;
}
EXPORT_SYMBOL_GPL(wm8400_set_bits);

/**
 * wm8400_reset_codec_reg_cache - Reset cached codec registers to
 * their default values.
 */
void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400)
{
	int i;

	mutex_lock(&wm8400->io_lock);

	/* Reset all codec registers to their initial value */
	for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
		if (reg_data[i].is_codec)
			wm8400->reg_cache[i] = reg_data[i].default_val;

	mutex_unlock(&wm8400->io_lock);
}
EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache);

static int wm8400_register_codec(struct wm8400 *wm8400)
{
	struct mfd_cell cell = {
		.name = "wm8400-codec",
		.platform_data = wm8400,
		.pdata_size = sizeof(*wm8400),
	};

	return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0);
}

/*
 * wm8400_init - Generic initialisation
 *
 * The WM8400 can be configured as either an I2C or SPI device.  Probe
 * functions for each bus set up the accessors then call into this to
 * set up the device itself.
 */
static int wm8400_init(struct wm8400 *wm8400,
		       struct wm8400_platform_data *pdata)
{
	u16 reg;
	int ret, i;

	mutex_init(&wm8400->io_lock);

	dev_set_drvdata(wm8400->dev, wm8400);

	/* Check that this is actually a WM8400 */
	ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, &i);
	if (ret != 0) {
		dev_err(wm8400->dev, "Chip ID register read failed\n");
		return -EIO;
	}
	if (i != reg_data[WM8400_RESET_ID].default_val) {
		dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
			reg);
		return -ENODEV;
	}

	/* We don't know what state the hardware is in and since this
	 * is a PMIC we can't reset it safely so initialise the register
	 * cache from the hardware.
	 */
	ret = regmap_raw_read(wm8400->regmap, 0, wm8400->reg_cache,
			      ARRAY_SIZE(wm8400->reg_cache));
	if (ret != 0) {
		dev_err(wm8400->dev, "Register cache read failed\n");
		return -EIO;
	}
	for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
		wm8400->reg_cache[i] = be16_to_cpu(wm8400->reg_cache[i]);

	/* If the codec is in reset use hard coded values */
	if (!(wm8400->reg_cache[WM8400_POWER_MANAGEMENT_1] & WM8400_CODEC_ENA))
		for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
			if (reg_data[i].is_codec)
				wm8400->reg_cache[i] = reg_data[i].default_val;

	ret = wm8400_read(wm8400, WM8400_ID, 1, &reg);
	if (ret != 0) {
		dev_err(wm8400->dev, "ID register read failed: %d\n", ret);
		return ret;
	}
	reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT;
	dev_info(wm8400->dev, "WM8400 revision %x\n", reg);

	ret = wm8400_register_codec(wm8400);
	if (ret != 0) {
		dev_err(wm8400->dev, "Failed to register codec\n");
		goto err_children;
	}

	if (pdata && pdata->platform_init) {
		ret = pdata->platform_init(wm8400->dev);
		if (ret != 0) {
			dev_err(wm8400->dev, "Platform init failed: %d\n",
				ret);
			goto err_children;
		}
	} else
		dev_warn(wm8400->dev, "No platform initialisation supplied\n");

	return 0;

err_children:
	mfd_remove_devices(wm8400->dev);
	return ret;
}

static void wm8400_release(struct wm8400 *wm8400)
{
	mfd_remove_devices(wm8400->dev);
}

static const struct regmap_config wm8400_regmap_config = {
	.reg_bits = 8,
	.val_bits = 16,
	.max_register = WM8400_REGISTER_COUNT - 1,
};

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static int wm8400_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct wm8400 *wm8400;
	int ret;

	wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL);
	if (wm8400 == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config);
	if (IS_ERR(wm8400->regmap)) {
		ret = PTR_ERR(wm8400->regmap);
		goto err;
	}

	wm8400->dev = &i2c->dev;
	i2c_set_clientdata(i2c, wm8400);

	ret = wm8400_init(wm8400, i2c->dev.platform_data);
	if (ret != 0)
		goto err;

	return 0;

err:
	return ret;
}

static int wm8400_i2c_remove(struct i2c_client *i2c)
{
	struct wm8400 *wm8400 = i2c_get_clientdata(i2c);

	wm8400_release(wm8400);

	return 0;
}

static const struct i2c_device_id wm8400_i2c_id[] = {
       { "wm8400", 0 },
       { }
};
MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id);

static struct i2c_driver wm8400_i2c_driver = {
	.driver = {
		.name = "WM8400",
		.owner = THIS_MODULE,
	},
	.probe    = wm8400_i2c_probe,
	.remove   = wm8400_i2c_remove,
	.id_table = wm8400_i2c_id,
};
#endif

static int __init wm8400_module_init(void)
{
	int ret = -ENODEV;

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
	ret = i2c_add_driver(&wm8400_i2c_driver);
	if (ret != 0)
		pr_err("Failed to register I2C driver: %d\n", ret);
#endif

	return ret;
}
subsys_initcall(wm8400_module_init);

static void __exit wm8400_module_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
	i2c_del_driver(&wm8400_i2c_driver);
#endif
}
module_exit(wm8400_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
OpenPOWER on IntegriCloud