/sound/soc/codecs/wm8978.c
C | 1150 lines | 809 code | 198 blank | 143 comment | 75 complexity | 5c6b3b465b501224e29cd91f4ac97331 MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
1/*
2 * wm8978.c -- WM8978 ALSA SoC Audio Codec driver
3 *
4 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
5 * Copyright (C) 2007 Carlos Munoz <carlos@kenati.com>
6 * Copyright 2006-2009 Wolfson Microelectronics PLC.
7 * Based on wm8974 and wm8990 by Liam Girdwood <lrg@slimlogic.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/delay.h>
19#include <linux/pm.h>
20#include <linux/i2c.h>
21#include <linux/platform_device.h>
22#include <linux/slab.h>
23#include <sound/core.h>
24#include <sound/pcm.h>
25#include <sound/pcm_params.h>
26#include <sound/soc.h>
27#include <sound/soc-dapm.h>
28#include <sound/initval.h>
29#include <sound/tlv.h>
30#include <asm/div64.h>
31
32#include "wm8978.h"
33
34static struct snd_soc_codec *wm8978_codec;
35
36/* wm8978 register cache. Note that register 0 is not included in the cache. */
37static const u16 wm8978_reg[WM8978_CACHEREGNUM] = {
38 0x0000, 0x0000, 0x0000, 0x0000, /* 0x00...0x03 */
39 0x0050, 0x0000, 0x0140, 0x0000, /* 0x04...0x07 */
40 0x0000, 0x0000, 0x0000, 0x00ff, /* 0x08...0x0b */
41 0x00ff, 0x0000, 0x0100, 0x00ff, /* 0x0c...0x0f */
42 0x00ff, 0x0000, 0x012c, 0x002c, /* 0x10...0x13 */
43 0x002c, 0x002c, 0x002c, 0x0000, /* 0x14...0x17 */
44 0x0032, 0x0000, 0x0000, 0x0000, /* 0x18...0x1b */
45 0x0000, 0x0000, 0x0000, 0x0000, /* 0x1c...0x1f */
46 0x0038, 0x000b, 0x0032, 0x0000, /* 0x20...0x23 */
47 0x0008, 0x000c, 0x0093, 0x00e9, /* 0x24...0x27 */
48 0x0000, 0x0000, 0x0000, 0x0000, /* 0x28...0x2b */
49 0x0033, 0x0010, 0x0010, 0x0100, /* 0x2c...0x2f */
50 0x0100, 0x0002, 0x0001, 0x0001, /* 0x30...0x33 */
51 0x0039, 0x0039, 0x0039, 0x0039, /* 0x34...0x37 */
52 0x0001, 0x0001, /* 0x38...0x3b */
53};
54
55/* codec private data */
56struct wm8978_priv {
57 struct snd_soc_codec codec;
58 unsigned int f_pllout;
59 unsigned int f_mclk;
60 unsigned int f_256fs;
61 unsigned int f_opclk;
62 int mclk_idx;
63 enum wm8978_sysclk_src sysclk;
64 u16 reg_cache[WM8978_CACHEREGNUM];
65};
66
67static const char *wm8978_companding[] = {"Off", "NC", "u-law", "A-law"};
68static const char *wm8978_eqmode[] = {"Capture", "Playback"};
69static const char *wm8978_bw[] = {"Narrow", "Wide"};
70static const char *wm8978_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz"};
71static const char *wm8978_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz"};
72static const char *wm8978_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz"};
73static const char *wm8978_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz"};
74static const char *wm8978_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz"};
75static const char *wm8978_alc3[] = {"ALC", "Limiter"};
76static const char *wm8978_alc1[] = {"Off", "Right", "Left", "Both"};
77
78static const SOC_ENUM_SINGLE_DECL(adc_compand, WM8978_COMPANDING_CONTROL, 1,
79 wm8978_companding);
80static const SOC_ENUM_SINGLE_DECL(dac_compand, WM8978_COMPANDING_CONTROL, 3,
81 wm8978_companding);
82static const SOC_ENUM_SINGLE_DECL(eqmode, WM8978_EQ1, 8, wm8978_eqmode);
83static const SOC_ENUM_SINGLE_DECL(eq1, WM8978_EQ1, 5, wm8978_eq1);
84static const SOC_ENUM_SINGLE_DECL(eq2bw, WM8978_EQ2, 8, wm8978_bw);
85static const SOC_ENUM_SINGLE_DECL(eq2, WM8978_EQ2, 5, wm8978_eq2);
86static const SOC_ENUM_SINGLE_DECL(eq3bw, WM8978_EQ3, 8, wm8978_bw);
87static const SOC_ENUM_SINGLE_DECL(eq3, WM8978_EQ3, 5, wm8978_eq3);
88static const SOC_ENUM_SINGLE_DECL(eq4bw, WM8978_EQ4, 8, wm8978_bw);
89static const SOC_ENUM_SINGLE_DECL(eq4, WM8978_EQ4, 5, wm8978_eq4);
90static const SOC_ENUM_SINGLE_DECL(eq5, WM8978_EQ5, 5, wm8978_eq5);
91static const SOC_ENUM_SINGLE_DECL(alc3, WM8978_ALC_CONTROL_3, 8, wm8978_alc3);
92static const SOC_ENUM_SINGLE_DECL(alc1, WM8978_ALC_CONTROL_1, 7, wm8978_alc1);
93
94static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
95static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
96static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
97static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);
98static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1);
99
100static const struct snd_kcontrol_new wm8978_snd_controls[] = {
101
102 SOC_SINGLE("Digital Loopback Switch",
103 WM8978_COMPANDING_CONTROL, 0, 1, 0),
104
105 SOC_ENUM("ADC Companding", adc_compand),
106 SOC_ENUM("DAC Companding", dac_compand),
107
108 SOC_DOUBLE("DAC Inversion Switch", WM8978_DAC_CONTROL, 0, 1, 1, 0),
109
110 SOC_DOUBLE_R_TLV("PCM Volume",
111 WM8978_LEFT_DAC_DIGITAL_VOLUME, WM8978_RIGHT_DAC_DIGITAL_VOLUME,
112 0, 255, 0, digital_tlv),
113
114 SOC_SINGLE("High Pass Filter Switch", WM8978_ADC_CONTROL, 8, 1, 0),
115 SOC_SINGLE("High Pass Cut Off", WM8978_ADC_CONTROL, 4, 7, 0),
116 SOC_DOUBLE("ADC Inversion Switch", WM8978_ADC_CONTROL, 0, 1, 1, 0),
117
118 SOC_DOUBLE_R_TLV("ADC Volume",
119 WM8978_LEFT_ADC_DIGITAL_VOLUME, WM8978_RIGHT_ADC_DIGITAL_VOLUME,
120 0, 255, 0, digital_tlv),
121
122 SOC_ENUM("Equaliser Function", eqmode),
123 SOC_ENUM("EQ1 Cut Off", eq1),
124 SOC_SINGLE_TLV("EQ1 Volume", WM8978_EQ1, 0, 24, 1, eq_tlv),
125
126 SOC_ENUM("Equaliser EQ2 Bandwith", eq2bw),
127 SOC_ENUM("EQ2 Cut Off", eq2),
128 SOC_SINGLE_TLV("EQ2 Volume", WM8978_EQ2, 0, 24, 1, eq_tlv),
129
130 SOC_ENUM("Equaliser EQ3 Bandwith", eq3bw),
131 SOC_ENUM("EQ3 Cut Off", eq3),
132 SOC_SINGLE_TLV("EQ3 Volume", WM8978_EQ3, 0, 24, 1, eq_tlv),
133
134 SOC_ENUM("Equaliser EQ4 Bandwith", eq4bw),
135 SOC_ENUM("EQ4 Cut Off", eq4),
136 SOC_SINGLE_TLV("EQ4 Volume", WM8978_EQ4, 0, 24, 1, eq_tlv),
137
138 SOC_ENUM("EQ5 Cut Off", eq5),
139 SOC_SINGLE_TLV("EQ5 Volume", WM8978_EQ5, 0, 24, 1, eq_tlv),
140
141 SOC_SINGLE("DAC Playback Limiter Switch",
142 WM8978_DAC_LIMITER_1, 8, 1, 0),
143 SOC_SINGLE("DAC Playback Limiter Decay",
144 WM8978_DAC_LIMITER_1, 4, 15, 0),
145 SOC_SINGLE("DAC Playback Limiter Attack",
146 WM8978_DAC_LIMITER_1, 0, 15, 0),
147
148 SOC_SINGLE("DAC Playback Limiter Threshold",
149 WM8978_DAC_LIMITER_2, 4, 7, 0),
150 SOC_SINGLE("DAC Playback Limiter Boost",
151 WM8978_DAC_LIMITER_2, 0, 15, 0),
152
153 SOC_ENUM("ALC Enable Switch", alc1),
154 SOC_SINGLE("ALC Capture Min Gain", WM8978_ALC_CONTROL_1, 0, 7, 0),
155 SOC_SINGLE("ALC Capture Max Gain", WM8978_ALC_CONTROL_1, 3, 7, 0),
156
157 SOC_SINGLE("ALC Capture Hold", WM8978_ALC_CONTROL_2, 4, 7, 0),
158 SOC_SINGLE("ALC Capture Target", WM8978_ALC_CONTROL_2, 0, 15, 0),
159
160 SOC_ENUM("ALC Capture Mode", alc3),
161 SOC_SINGLE("ALC Capture Decay", WM8978_ALC_CONTROL_3, 4, 15, 0),
162 SOC_SINGLE("ALC Capture Attack", WM8978_ALC_CONTROL_3, 0, 15, 0),
163
164 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8978_NOISE_GATE, 3, 1, 0),
165 SOC_SINGLE("ALC Capture Noise Gate Threshold",
166 WM8978_NOISE_GATE, 0, 7, 0),
167
168 SOC_DOUBLE_R("Capture PGA ZC Switch",
169 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
170 7, 1, 0),
171
172 /* OUT1 - Headphones */
173 SOC_DOUBLE_R("Headphone Playback ZC Switch",
174 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 7, 1, 0),
175
176 SOC_DOUBLE_R_TLV("Headphone Playback Volume",
177 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL,
178 0, 63, 0, spk_tlv),
179
180 /* OUT2 - Speakers */
181 SOC_DOUBLE_R("Speaker Playback ZC Switch",
182 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 7, 1, 0),
183
184 SOC_DOUBLE_R_TLV("Speaker Playback Volume",
185 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL,
186 0, 63, 0, spk_tlv),
187
188 /* OUT3/4 - Line Output */
189 SOC_DOUBLE_R("Line Playback Switch",
190 WM8978_OUT3_MIXER_CONTROL, WM8978_OUT4_MIXER_CONTROL, 6, 1, 1),
191
192 /* Mixer #3: Boost (Input) mixer */
193 SOC_DOUBLE_R("PGA Boost (+20dB)",
194 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
195 8, 1, 0),
196 SOC_DOUBLE_R_TLV("L2/R2 Boost Volume",
197 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
198 4, 7, 0, boost_tlv),
199 SOC_DOUBLE_R_TLV("Aux Boost Volume",
200 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
201 0, 7, 0, boost_tlv),
202
203 /* Input PGA volume */
204 SOC_DOUBLE_R_TLV("Input PGA Volume",
205 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
206 0, 63, 0, inpga_tlv),
207
208 /* Headphone */
209 SOC_DOUBLE_R("Headphone Switch",
210 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 6, 1, 1),
211
212 /* Speaker */
213 SOC_DOUBLE_R("Speaker Switch",
214 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 6, 1, 1),
215
216 /* DAC / ADC oversampling */
217 SOC_SINGLE("DAC 128x Oversampling Switch", WM8978_DAC_CONTROL, 8, 1, 0),
218 SOC_SINGLE("ADC 128x Oversampling Switch", WM8978_ADC_CONTROL, 8, 1, 0),
219};
220
221/* Mixer #1: Output (OUT1, OUT2) Mixer: mix AUX, Input mixer output and DAC */
222static const struct snd_kcontrol_new wm8978_left_out_mixer[] = {
223 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_LEFT_MIXER_CONTROL, 1, 1, 0),
224 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_LEFT_MIXER_CONTROL, 5, 1, 0),
225 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_LEFT_MIXER_CONTROL, 0, 1, 0),
226};
227
228static const struct snd_kcontrol_new wm8978_right_out_mixer[] = {
229 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_RIGHT_MIXER_CONTROL, 1, 1, 0),
230 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 5, 1, 0),
231 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 0, 1, 0),
232};
233
234/* OUT3/OUT4 Mixer not implemented */
235
236/* Mixer #2: Input PGA Mute */
237static const struct snd_kcontrol_new wm8978_left_input_mixer[] = {
238 SOC_DAPM_SINGLE("L2 Switch", WM8978_INPUT_CONTROL, 2, 1, 0),
239 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 1, 1, 0),
240 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 0, 1, 0),
241};
242static const struct snd_kcontrol_new wm8978_right_input_mixer[] = {
243 SOC_DAPM_SINGLE("R2 Switch", WM8978_INPUT_CONTROL, 6, 1, 0),
244 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 5, 1, 0),
245 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 4, 1, 0),
246};
247
248static const struct snd_soc_dapm_widget wm8978_dapm_widgets[] = {
249 SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback",
250 WM8978_POWER_MANAGEMENT_3, 0, 0),
251 SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback",
252 WM8978_POWER_MANAGEMENT_3, 1, 0),
253 SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture",
254 WM8978_POWER_MANAGEMENT_2, 0, 0),
255 SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture",
256 WM8978_POWER_MANAGEMENT_2, 1, 0),
257
258 /* Mixer #1: OUT1,2 */
259 SOC_MIXER_ARRAY("Left Output Mixer", WM8978_POWER_MANAGEMENT_3,
260 2, 0, wm8978_left_out_mixer),
261 SOC_MIXER_ARRAY("Right Output Mixer", WM8978_POWER_MANAGEMENT_3,
262 3, 0, wm8978_right_out_mixer),
263
264 SOC_MIXER_ARRAY("Left Input Mixer", WM8978_POWER_MANAGEMENT_2,
265 2, 0, wm8978_left_input_mixer),
266 SOC_MIXER_ARRAY("Right Input Mixer", WM8978_POWER_MANAGEMENT_2,
267 3, 0, wm8978_right_input_mixer),
268
269 SND_SOC_DAPM_PGA("Left Boost Mixer", WM8978_POWER_MANAGEMENT_2,
270 4, 0, NULL, 0),
271 SND_SOC_DAPM_PGA("Right Boost Mixer", WM8978_POWER_MANAGEMENT_2,
272 5, 0, NULL, 0),
273
274 SND_SOC_DAPM_PGA("Left Capture PGA", WM8978_LEFT_INP_PGA_CONTROL,
275 6, 1, NULL, 0),
276 SND_SOC_DAPM_PGA("Right Capture PGA", WM8978_RIGHT_INP_PGA_CONTROL,
277 6, 1, NULL, 0),
278
279 SND_SOC_DAPM_PGA("Left Headphone Out", WM8978_POWER_MANAGEMENT_2,
280 7, 0, NULL, 0),
281 SND_SOC_DAPM_PGA("Right Headphone Out", WM8978_POWER_MANAGEMENT_2,
282 8, 0, NULL, 0),
283
284 SND_SOC_DAPM_PGA("Left Speaker Out", WM8978_POWER_MANAGEMENT_3,
285 6, 0, NULL, 0),
286 SND_SOC_DAPM_PGA("Right Speaker Out", WM8978_POWER_MANAGEMENT_3,
287 5, 0, NULL, 0),
288
289 SND_SOC_DAPM_MIXER("OUT4 VMID", WM8978_POWER_MANAGEMENT_3,
290 8, 0, NULL, 0),
291
292 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8978_POWER_MANAGEMENT_1, 4, 0),
293
294 SND_SOC_DAPM_INPUT("LMICN"),
295 SND_SOC_DAPM_INPUT("LMICP"),
296 SND_SOC_DAPM_INPUT("RMICN"),
297 SND_SOC_DAPM_INPUT("RMICP"),
298 SND_SOC_DAPM_INPUT("LAUX"),
299 SND_SOC_DAPM_INPUT("RAUX"),
300 SND_SOC_DAPM_INPUT("L2"),
301 SND_SOC_DAPM_INPUT("R2"),
302 SND_SOC_DAPM_OUTPUT("LHP"),
303 SND_SOC_DAPM_OUTPUT("RHP"),
304 SND_SOC_DAPM_OUTPUT("LSPK"),
305 SND_SOC_DAPM_OUTPUT("RSPK"),
306};
307
308static const struct snd_soc_dapm_route audio_map[] = {
309 /* Output mixer */
310 {"Right Output Mixer", "PCM Playback Switch", "Right DAC"},
311 {"Right Output Mixer", "Aux Playback Switch", "RAUX"},
312 {"Right Output Mixer", "Line Bypass Switch", "Right Boost Mixer"},
313
314 {"Left Output Mixer", "PCM Playback Switch", "Left DAC"},
315 {"Left Output Mixer", "Aux Playback Switch", "LAUX"},
316 {"Left Output Mixer", "Line Bypass Switch", "Left Boost Mixer"},
317
318 /* Outputs */
319 {"Right Headphone Out", NULL, "Right Output Mixer"},
320 {"RHP", NULL, "Right Headphone Out"},
321
322 {"Left Headphone Out", NULL, "Left Output Mixer"},
323 {"LHP", NULL, "Left Headphone Out"},
324
325 {"Right Speaker Out", NULL, "Right Output Mixer"},
326 {"RSPK", NULL, "Right Speaker Out"},
327
328 {"Left Speaker Out", NULL, "Left Output Mixer"},
329 {"LSPK", NULL, "Left Speaker Out"},
330
331 /* Boost Mixer */
332 {"Right ADC", NULL, "Right Boost Mixer"},
333
334 {"Right Boost Mixer", NULL, "RAUX"},
335 {"Right Boost Mixer", NULL, "Right Capture PGA"},
336 {"Right Boost Mixer", NULL, "R2"},
337
338 {"Left ADC", NULL, "Left Boost Mixer"},
339
340 {"Left Boost Mixer", NULL, "LAUX"},
341 {"Left Boost Mixer", NULL, "Left Capture PGA"},
342 {"Left Boost Mixer", NULL, "L2"},
343
344 /* Input PGA */
345 {"Right Capture PGA", NULL, "Right Input Mixer"},
346 {"Left Capture PGA", NULL, "Left Input Mixer"},
347
348 {"Right Input Mixer", "R2 Switch", "R2"},
349 {"Right Input Mixer", "MicN Switch", "RMICN"},
350 {"Right Input Mixer", "MicP Switch", "RMICP"},
351
352 {"Left Input Mixer", "L2 Switch", "L2"},
353 {"Left Input Mixer", "MicN Switch", "LMICN"},
354 {"Left Input Mixer", "MicP Switch", "LMICP"},
355};
356
357static int wm8978_add_widgets(struct snd_soc_codec *codec)
358{
359 snd_soc_dapm_new_controls(codec, wm8978_dapm_widgets,
360 ARRAY_SIZE(wm8978_dapm_widgets));
361
362 /* set up the WM8978 audio map */
363 snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
364
365 return 0;
366}
367
368/* PLL divisors */
369struct wm8978_pll_div {
370 u32 k;
371 u8 n;
372 u8 div2;
373};
374
375#define FIXED_PLL_SIZE (1 << 24)
376
377static void pll_factors(struct wm8978_pll_div *pll_div, unsigned int target,
378 unsigned int source)
379{
380 u64 k_part;
381 unsigned int k, n_div, n_mod;
382
383 n_div = target / source;
384 if (n_div < 6) {
385 source >>= 1;
386 pll_div->div2 = 1;
387 n_div = target / source;
388 } else {
389 pll_div->div2 = 0;
390 }
391
392 if (n_div < 6 || n_div > 12)
393 dev_warn(wm8978_codec->dev,
394 "WM8978 N value exceeds recommended range! N = %u\n",
395 n_div);
396
397 pll_div->n = n_div;
398 n_mod = target - source * n_div;
399 k_part = FIXED_PLL_SIZE * (long long)n_mod + source / 2;
400
401 do_div(k_part, source);
402
403 k = k_part & 0xFFFFFFFF;
404
405 pll_div->k = k;
406}
407
408/* MCLK dividers */
409static const int mclk_numerator[] = {1, 3, 2, 3, 4, 6, 8, 12};
410static const int mclk_denominator[] = {1, 2, 1, 1, 1, 1, 1, 1};
411
412/*
413 * find index >= idx, such that, for a given f_out,
414 * 3 * f_mclk / 4 <= f_PLLOUT < 13 * f_mclk / 4
415 * f_out can be f_256fs or f_opclk, currently only used for f_256fs. Can be
416 * generalised for f_opclk with suitable coefficient arrays, but currently
417 * the OPCLK divisor is calculated directly, not iteratively.
418 */
419static int wm8978_enum_mclk(unsigned int f_out, unsigned int f_mclk,
420 unsigned int *f_pllout)
421{
422 int i;
423
424 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
425 unsigned int f_pllout_x4 = 4 * f_out * mclk_numerator[i] /
426 mclk_denominator[i];
427 if (3 * f_mclk <= f_pllout_x4 && f_pllout_x4 < 13 * f_mclk) {
428 *f_pllout = f_pllout_x4 / 4;
429 return i;
430 }
431 }
432
433 return -EINVAL;
434}
435
436/*
437 * Calculate internal frequencies and dividers, according to Figure 40
438 * "PLL and Clock Select Circuit" in WM8978 datasheet Rev. 2.6
439 */
440static int wm8978_configure_pll(struct snd_soc_codec *codec)
441{
442 struct wm8978_priv *wm8978 = codec->private_data;
443 struct wm8978_pll_div pll_div;
444 unsigned int f_opclk = wm8978->f_opclk, f_mclk = wm8978->f_mclk,
445 f_256fs = wm8978->f_256fs;
446 unsigned int f2;
447
448 if (!f_mclk)
449 return -EINVAL;
450
451 if (f_opclk) {
452 unsigned int opclk_div;
453 /* Cannot set up MCLK divider now, do later */
454 wm8978->mclk_idx = -1;
455
456 /*
457 * The user needs OPCLK. Choose OPCLKDIV to put
458 * 6 <= R = f2 / f1 < 13, 1 <= OPCLKDIV <= 4.
459 * f_opclk = f_mclk * prescale * R / 4 / OPCLKDIV, where
460 * prescale = 1, or prescale = 2. Prescale is calculated inside
461 * pll_factors(). We have to select f_PLLOUT, such that
462 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
463 * f_mclk * 3 / 16 <= f_opclk < f_mclk * 13 / 4.
464 */
465 if (16 * f_opclk < 3 * f_mclk || 4 * f_opclk >= 13 * f_mclk)
466 return -EINVAL;
467
468 if (4 * f_opclk < 3 * f_mclk)
469 /* Have to use OPCLKDIV */
470 opclk_div = (3 * f_mclk / 4 + f_opclk - 1) / f_opclk;
471 else
472 opclk_div = 1;
473
474 dev_dbg(codec->dev, "%s: OPCLKDIV=%d\n", __func__, opclk_div);
475
476 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 0x30,
477 (opclk_div - 1) << 4);
478
479 wm8978->f_pllout = f_opclk * opclk_div;
480 } else if (f_256fs) {
481 /*
482 * Not using OPCLK, but PLL is used for the codec, choose R:
483 * 6 <= R = f2 / f1 < 13, to put 1 <= MCLKDIV <= 12.
484 * f_256fs = f_mclk * prescale * R / 4 / MCLKDIV, where
485 * prescale = 1, or prescale = 2. Prescale is calculated inside
486 * pll_factors(). We have to select f_PLLOUT, such that
487 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
488 * f_mclk * 3 / 48 <= f_256fs < f_mclk * 13 / 4. This means MCLK
489 * must be 3.781MHz <= f_MCLK <= 32.768MHz
490 */
491 int idx = wm8978_enum_mclk(f_256fs, f_mclk, &wm8978->f_pllout);
492 if (idx < 0)
493 return idx;
494
495 wm8978->mclk_idx = idx;
496
497 /* GPIO1 into default mode as input - before configuring PLL */
498 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
499 } else {
500 return -EINVAL;
501 }
502
503 f2 = wm8978->f_pllout * 4;
504
505 dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__,
506 wm8978->f_mclk, wm8978->f_pllout);
507
508 pll_factors(&pll_div, f2, wm8978->f_mclk);
509
510 dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n",
511 __func__, pll_div.n, pll_div.k, pll_div.div2);
512
513 /* Turn PLL off for configuration... */
514 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
515
516 snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n);
517 snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18);
518 snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff);
519 snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff);
520
521 /* ...and on again */
522 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
523
524 if (f_opclk)
525 /* Output PLL (OPCLK) to GPIO1 */
526 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4);
527
528 return 0;
529}
530
531/*
532 * Configure WM8978 clock dividers.
533 */
534static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
535 int div_id, int div)
536{
537 struct snd_soc_codec *codec = codec_dai->codec;
538 struct wm8978_priv *wm8978 = codec->private_data;
539 int ret = 0;
540
541 switch (div_id) {
542 case WM8978_OPCLKRATE:
543 wm8978->f_opclk = div;
544
545 if (wm8978->f_mclk)
546 /*
547 * We know the MCLK frequency, the user has requested
548 * OPCLK, configure the PLL based on that and start it
549 * and OPCLK immediately. We will configure PLL to match
550 * user-requested OPCLK frquency as good as possible.
551 * In fact, it is likely, that matching the sampling
552 * rate, when it becomes known, is more important, and
553 * we will not be reconfiguring PLL then, because we
554 * must not interrupt OPCLK. But it should be fine,
555 * because typically the user will request OPCLK to run
556 * at 256fs or 512fs, and for these cases we will also
557 * find an exact MCLK divider configuration - it will
558 * be equal to or double the OPCLK divisor.
559 */
560 ret = wm8978_configure_pll(codec);
561 break;
562 case WM8978_BCLKDIV:
563 if (div & ~0x1c)
564 return -EINVAL;
565 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div);
566 break;
567 default:
568 return -EINVAL;
569 }
570
571 dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div);
572
573 return ret;
574}
575
576/*
577 * @freq: when .set_pll() us not used, freq is codec MCLK input frequency
578 */
579static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
580 unsigned int freq, int dir)
581{
582 struct snd_soc_codec *codec = codec_dai->codec;
583 struct wm8978_priv *wm8978 = codec->private_data;
584 int ret = 0;
585
586 dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq);
587
588 if (freq) {
589 wm8978->f_mclk = freq;
590
591 /* Even if MCLK is used for system clock, might have to drive OPCLK */
592 if (wm8978->f_opclk)
593 ret = wm8978_configure_pll(codec);
594
595 /* Our sysclk is fixed to 256 * fs, will configure in .hw_params() */
596
597 if (!ret)
598 wm8978->sysclk = clk_id;
599 }
600
601 if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) {
602 /* Clock CODEC directly from MCLK */
603 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
604
605 /* GPIO1 into default mode as input - before configuring PLL */
606 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
607
608 /* Turn off PLL */
609 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
610 wm8978->sysclk = WM8978_MCLK;
611 wm8978->f_pllout = 0;
612 wm8978->f_opclk = 0;
613 }
614
615 return ret;
616}
617
618/*
619 * Set ADC and Voice DAC format.
620 */
621static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
622{
623 struct snd_soc_codec *codec = codec_dai->codec;
624 /*
625 * BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80,
626 * Data Format mask = 0x18: all will be calculated anew
627 */
628 u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198;
629 u16 clk = snd_soc_read(codec, WM8978_CLOCKING);
630
631 dev_dbg(codec->dev, "%s\n", __func__);
632
633 /* set master/slave audio interface */
634 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
635 case SND_SOC_DAIFMT_CBM_CFM:
636 clk |= 1;
637 break;
638 case SND_SOC_DAIFMT_CBS_CFS:
639 clk &= ~1;
640 break;
641 default:
642 return -EINVAL;
643 }
644
645 /* interface format */
646 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
647 case SND_SOC_DAIFMT_I2S:
648 iface |= 0x10;
649 break;
650 case SND_SOC_DAIFMT_RIGHT_J:
651 break;
652 case SND_SOC_DAIFMT_LEFT_J:
653 iface |= 0x8;
654 break;
655 case SND_SOC_DAIFMT_DSP_A:
656 iface |= 0x18;
657 break;
658 default:
659 return -EINVAL;
660 }
661
662 /* clock inversion */
663 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
664 case SND_SOC_DAIFMT_NB_NF:
665 break;
666 case SND_SOC_DAIFMT_IB_IF:
667 iface |= 0x180;
668 break;
669 case SND_SOC_DAIFMT_IB_NF:
670 iface |= 0x100;
671 break;
672 case SND_SOC_DAIFMT_NB_IF:
673 iface |= 0x80;
674 break;
675 default:
676 return -EINVAL;
677 }
678
679 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface);
680 snd_soc_write(codec, WM8978_CLOCKING, clk);
681
682 return 0;
683}
684
685/*
686 * Set PCM DAI bit size and sample rate.
687 */
688static int wm8978_hw_params(struct snd_pcm_substream *substream,
689 struct snd_pcm_hw_params *params,
690 struct snd_soc_dai *dai)
691{
692 struct snd_soc_pcm_runtime *rtd = substream->private_data;
693 struct snd_soc_device *socdev = rtd->socdev;
694 struct snd_soc_codec *codec = socdev->card->codec;
695 struct wm8978_priv *wm8978 = codec->private_data;
696 /* Word length mask = 0x60 */
697 u16 iface_ctl = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x60;
698 /* Sampling rate mask = 0xe (for filters) */
699 u16 add_ctl = snd_soc_read(codec, WM8978_ADDITIONAL_CONTROL) & ~0xe;
700 u16 clking = snd_soc_read(codec, WM8978_CLOCKING);
701 enum wm8978_sysclk_src current_clk_id = clking & 0x100 ?
702 WM8978_PLL : WM8978_MCLK;
703 unsigned int f_sel, diff, diff_best = INT_MAX;
704 int i, best = 0;
705
706 if (!wm8978->f_mclk)
707 return -EINVAL;
708
709 /* bit size */
710 switch (params_format(params)) {
711 case SNDRV_PCM_FORMAT_S16_LE:
712 break;
713 case SNDRV_PCM_FORMAT_S20_3LE:
714 iface_ctl |= 0x20;
715 break;
716 case SNDRV_PCM_FORMAT_S24_LE:
717 iface_ctl |= 0x40;
718 break;
719 case SNDRV_PCM_FORMAT_S32_LE:
720 iface_ctl |= 0x60;
721 break;
722 }
723
724 /* filter coefficient */
725 switch (params_rate(params)) {
726 case 8000:
727 add_ctl |= 0x5 << 1;
728 break;
729 case 11025:
730 add_ctl |= 0x4 << 1;
731 break;
732 case 16000:
733 add_ctl |= 0x3 << 1;
734 break;
735 case 22050:
736 add_ctl |= 0x2 << 1;
737 break;
738 case 32000:
739 add_ctl |= 0x1 << 1;
740 break;
741 case 44100:
742 case 48000:
743 break;
744 }
745
746 /* Sampling rate is known now, can configure the MCLK divider */
747 wm8978->f_256fs = params_rate(params) * 256;
748
749 if (wm8978->sysclk == WM8978_MCLK) {
750 wm8978->mclk_idx = -1;
751 f_sel = wm8978->f_mclk;
752 } else {
753 if (!wm8978->f_pllout) {
754 /* We only enter here, if OPCLK is not used */
755 int ret = wm8978_configure_pll(codec);
756 if (ret < 0)
757 return ret;
758 }
759 f_sel = wm8978->f_pllout;
760 }
761
762 if (wm8978->mclk_idx < 0) {
763 /* Either MCLK is used directly, or OPCLK is used */
764 if (f_sel < wm8978->f_256fs || f_sel > 12 * wm8978->f_256fs)
765 return -EINVAL;
766
767 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
768 diff = abs(wm8978->f_256fs * 3 -
769 f_sel * 3 * mclk_denominator[i] / mclk_numerator[i]);
770
771 if (diff < diff_best) {
772 diff_best = diff;
773 best = i;
774 }
775
776 if (!diff)
777 break;
778 }
779 } else {
780 /* OPCLK not used, codec driven by PLL */
781 best = wm8978->mclk_idx;
782 diff = 0;
783 }
784
785 if (diff)
786 dev_warn(codec->dev, "Imprecise sampling rate: %uHz%s\n",
787 f_sel * mclk_denominator[best] / mclk_numerator[best] / 256,
788 wm8978->sysclk == WM8978_MCLK ?
789 ", consider using PLL" : "");
790
791 dev_dbg(codec->dev, "%s: fmt %d, rate %u, MCLK divisor #%d\n", __func__,
792 params_format(params), params_rate(params), best);
793
794 /* MCLK divisor mask = 0xe0 */
795 snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, best << 5);
796
797 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface_ctl);
798 snd_soc_write(codec, WM8978_ADDITIONAL_CONTROL, add_ctl);
799
800 if (wm8978->sysclk != current_clk_id) {
801 if (wm8978->sysclk == WM8978_PLL)
802 /* Run CODEC from PLL instead of MCLK */
803 snd_soc_update_bits(codec, WM8978_CLOCKING,
804 0x100, 0x100);
805 else
806 /* Clock CODEC directly from MCLK */
807 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
808 }
809
810 return 0;
811}
812
813static int wm8978_mute(struct snd_soc_dai *dai, int mute)
814{
815 struct snd_soc_codec *codec = dai->codec;
816
817 dev_dbg(codec->dev, "%s: %d\n", __func__, mute);
818
819 if (mute)
820 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0x40);
821 else
822 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0);
823
824 return 0;
825}
826
827static int wm8978_set_bias_level(struct snd_soc_codec *codec,
828 enum snd_soc_bias_level level)
829{
830 u16 power1 = snd_soc_read(codec, WM8978_POWER_MANAGEMENT_1) & ~3;
831
832 switch (level) {
833 case SND_SOC_BIAS_ON:
834 case SND_SOC_BIAS_PREPARE:
835 power1 |= 1; /* VMID 75k */
836 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
837 break;
838 case SND_SOC_BIAS_STANDBY:
839 /* bit 3: enable bias, bit 2: enable I/O tie off buffer */
840 power1 |= 0xc;
841
842 if (codec->bias_level == SND_SOC_BIAS_OFF) {
843 /* Initial cap charge at VMID 5k */
844 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1,
845 power1 | 0x3);
846 mdelay(100);
847 }
848
849 power1 |= 0x2; /* VMID 500k */
850 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
851 break;
852 case SND_SOC_BIAS_OFF:
853 /* Preserve PLL - OPCLK may be used by someone */
854 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, ~0x20, 0);
855 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0);
856 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_3, 0);
857 break;
858 }
859
860 dev_dbg(codec->dev, "%s: %d, %x\n", __func__, level, power1);
861
862 codec->bias_level = level;
863 return 0;
864}
865
866#define WM8978_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
867 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
868
869static struct snd_soc_dai_ops wm8978_dai_ops = {
870 .hw_params = wm8978_hw_params,
871 .digital_mute = wm8978_mute,
872 .set_fmt = wm8978_set_dai_fmt,
873 .set_clkdiv = wm8978_set_dai_clkdiv,
874 .set_sysclk = wm8978_set_dai_sysclk,
875};
876
877/* Also supports 12kHz */
878struct snd_soc_dai wm8978_dai = {
879 .name = "WM8978 HiFi",
880 .id = 1,
881 .playback = {
882 .stream_name = "Playback",
883 .channels_min = 1,
884 .channels_max = 2,
885 .rates = SNDRV_PCM_RATE_8000_48000,
886 .formats = WM8978_FORMATS,
887 },
888 .capture = {
889 .stream_name = "Capture",
890 .channels_min = 1,
891 .channels_max = 2,
892 .rates = SNDRV_PCM_RATE_8000_48000,
893 .formats = WM8978_FORMATS,
894 },
895 .ops = &wm8978_dai_ops,
896};
897EXPORT_SYMBOL_GPL(wm8978_dai);
898
899static int wm8978_suspend(struct platform_device *pdev, pm_message_t state)
900{
901 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
902 struct snd_soc_codec *codec = socdev->card->codec;
903
904 wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
905 /* Also switch PLL off */
906 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0);
907
908 return 0;
909}
910
911static int wm8978_resume(struct platform_device *pdev)
912{
913 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
914 struct snd_soc_codec *codec = socdev->card->codec;
915 struct wm8978_priv *wm8978 = codec->private_data;
916 int i;
917 u16 *cache = codec->reg_cache;
918
919 /* Sync reg_cache with the hardware */
920 for (i = 0; i < ARRAY_SIZE(wm8978_reg); i++) {
921 if (i == WM8978_RESET)
922 continue;
923 if (cache[i] != wm8978_reg[i])
924 snd_soc_write(codec, i, cache[i]);
925 }
926
927 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
928
929 if (wm8978->f_pllout)
930 /* Switch PLL on */
931 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
932
933 return 0;
934}
935
936static int wm8978_probe(struct platform_device *pdev)
937{
938 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
939 struct snd_soc_codec *codec;
940 int ret = 0;
941
942 if (wm8978_codec == NULL) {
943 dev_err(&pdev->dev, "Codec device not registered\n");
944 return -ENODEV;
945 }
946
947 socdev->card->codec = wm8978_codec;
948 codec = wm8978_codec;
949
950 /* register pcms */
951 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
952 if (ret < 0) {
953 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
954 goto pcm_err;
955 }
956
957 snd_soc_add_controls(codec, wm8978_snd_controls,
958 ARRAY_SIZE(wm8978_snd_controls));
959 wm8978_add_widgets(codec);
960
961pcm_err:
962 return ret;
963}
964
965/* power down chip */
966static int wm8978_remove(struct platform_device *pdev)
967{
968 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
969
970 snd_soc_free_pcms(socdev);
971 snd_soc_dapm_free(socdev);
972
973 return 0;
974}
975
976struct snd_soc_codec_device soc_codec_dev_wm8978 = {
977 .probe = wm8978_probe,
978 .remove = wm8978_remove,
979 .suspend = wm8978_suspend,
980 .resume = wm8978_resume,
981};
982EXPORT_SYMBOL_GPL(soc_codec_dev_wm8978);
983
984/*
985 * These registers contain an "update" bit - bit 8. This means, for example,
986 * that one can write new DAC digital volume for both channels, but only when
987 * the update bit is set, will also the volume be updated - simultaneously for
988 * both channels.
989 */
990static const int update_reg[] = {
991 WM8978_LEFT_DAC_DIGITAL_VOLUME,
992 WM8978_RIGHT_DAC_DIGITAL_VOLUME,
993 WM8978_LEFT_ADC_DIGITAL_VOLUME,
994 WM8978_RIGHT_ADC_DIGITAL_VOLUME,
995 WM8978_LEFT_INP_PGA_CONTROL,
996 WM8978_RIGHT_INP_PGA_CONTROL,
997 WM8978_LOUT1_HP_CONTROL,
998 WM8978_ROUT1_HP_CONTROL,
999 WM8978_LOUT2_SPK_CONTROL,
1000 WM8978_ROUT2_SPK_CONTROL,
1001};
1002
1003static __devinit int wm8978_register(struct wm8978_priv *wm8978)
1004{
1005 int ret, i;
1006 struct snd_soc_codec *codec = &wm8978->codec;
1007
1008 if (wm8978_codec) {
1009 dev_err(codec->dev, "Another WM8978 is registered\n");
1010 return -EINVAL;
1011 }
1012
1013 /*
1014 * Set default system clock to PLL, it is more precise, this is also the
1015 * default hardware setting
1016 */
1017 wm8978->sysclk = WM8978_PLL;
1018
1019 mutex_init(&codec->mutex);
1020 INIT_LIST_HEAD(&codec->dapm_widgets);
1021 INIT_LIST_HEAD(&codec->dapm_paths);
1022
1023 codec->private_data = wm8978;
1024 codec->name = "WM8978";
1025 codec->owner = THIS_MODULE;
1026 codec->bias_level = SND_SOC_BIAS_OFF;
1027 codec->set_bias_level = wm8978_set_bias_level;
1028 codec->dai = &wm8978_dai;
1029 codec->num_dai = 1;
1030 codec->reg_cache_size = WM8978_CACHEREGNUM;
1031 codec->reg_cache = &wm8978->reg_cache;
1032
1033 ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
1034 if (ret < 0) {
1035 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
1036 goto err;
1037 }
1038
1039 memcpy(codec->reg_cache, wm8978_reg, sizeof(wm8978_reg));
1040
1041 /*
1042 * Set the update bit in all registers, that have one. This way all
1043 * writes to those registers will also cause the update bit to be
1044 * written.
1045 */
1046 for (i = 0; i < ARRAY_SIZE(update_reg); i++)
1047 ((u16 *)codec->reg_cache)[update_reg[i]] |= 0x100;
1048
1049 /* Reset the codec */
1050 ret = snd_soc_write(codec, WM8978_RESET, 0);
1051 if (ret < 0) {
1052 dev_err(codec->dev, "Failed to issue reset\n");
1053 goto err;
1054 }
1055
1056 wm8978_dai.dev = codec->dev;
1057
1058 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
1059
1060 wm8978_codec = codec;
1061
1062 ret = snd_soc_register_codec(codec);
1063 if (ret != 0) {
1064 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
1065 goto err;
1066 }
1067
1068 ret = snd_soc_register_dai(&wm8978_dai);
1069 if (ret != 0) {
1070 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
1071 goto err_codec;
1072 }
1073
1074 return 0;
1075
1076err_codec:
1077 snd_soc_unregister_codec(codec);
1078err:
1079 kfree(wm8978);
1080 return ret;
1081}
1082
1083static __devexit void wm8978_unregister(struct wm8978_priv *wm8978)
1084{
1085 wm8978_set_bias_level(&wm8978->codec, SND_SOC_BIAS_OFF);
1086 snd_soc_unregister_dai(&wm8978_dai);
1087 snd_soc_unregister_codec(&wm8978->codec);
1088 kfree(wm8978);
1089 wm8978_codec = NULL;
1090}
1091
1092static __devinit int wm8978_i2c_probe(struct i2c_client *i2c,
1093 const struct i2c_device_id *id)
1094{
1095 struct wm8978_priv *wm8978;
1096 struct snd_soc_codec *codec;
1097
1098 wm8978 = kzalloc(sizeof(struct wm8978_priv), GFP_KERNEL);
1099 if (wm8978 == NULL)
1100 return -ENOMEM;
1101
1102 codec = &wm8978->codec;
1103 codec->hw_write = (hw_write_t)i2c_master_send;
1104
1105 i2c_set_clientdata(i2c, wm8978);
1106 codec->control_data = i2c;
1107
1108 codec->dev = &i2c->dev;
1109
1110 return wm8978_register(wm8978);
1111}
1112
1113static __devexit int wm8978_i2c_remove(struct i2c_client *client)
1114{
1115 struct wm8978_priv *wm8978 = i2c_get_clientdata(client);
1116 wm8978_unregister(wm8978);
1117 return 0;
1118}
1119
1120static const struct i2c_device_id wm8978_i2c_id[] = {
1121 { "wm8978", 0 },
1122 { }
1123};
1124MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
1125
1126static struct i2c_driver wm8978_i2c_driver = {
1127 .driver = {
1128 .name = "WM8978",
1129 .owner = THIS_MODULE,
1130 },
1131 .probe = wm8978_i2c_probe,
1132 .remove = __devexit_p(wm8978_i2c_remove),
1133 .id_table = wm8978_i2c_id,
1134};
1135
1136static int __init wm8978_modinit(void)
1137{
1138 return i2c_add_driver(&wm8978_i2c_driver);
1139}
1140module_init(wm8978_modinit);
1141
1142static void __exit wm8978_exit(void)
1143{
1144 i2c_del_driver(&wm8978_i2c_driver);
1145}
1146module_exit(wm8978_exit);
1147
1148MODULE_DESCRIPTION("ASoC WM8978 codec driver");
1149MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
1150MODULE_LICENSE("GPL");