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ASoC: improve MCLKDIV calculation in wm8978, when OPCLK is not used
[net-next-2.6.git] / sound / soc / codecs / wm8978.c
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0d34e915
GL		 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 <sound/core.h>
23#include <sound/pcm.h>
24#include <sound/pcm_params.h>
25#include <sound/soc.h>
26#include <sound/soc-dapm.h>
27#include <sound/initval.h>
28#include <sound/tlv.h>
29#include <asm/div64.h>
30
31#include "wm8978.h"
32
33static struct snd_soc_codec *wm8978_codec;
34
35/* wm8978 register cache. Note that register 0 is not included in the cache. */
36static const u16 wm8978_reg[WM8978_CACHEREGNUM] = {
37 0x0000, 0x0000, 0x0000, 0x0000, /* 0x00...0x03 */
38 0x0050, 0x0000, 0x0140, 0x0000, /* 0x04...0x07 */
39 0x0000, 0x0000, 0x0000, 0x00ff, /* 0x08...0x0b */
40 0x00ff, 0x0000, 0x0100, 0x00ff, /* 0x0c...0x0f */
41 0x00ff, 0x0000, 0x012c, 0x002c, /* 0x10...0x13 */
42 0x002c, 0x002c, 0x002c, 0x0000, /* 0x14...0x17 */
43 0x0032, 0x0000, 0x0000, 0x0000, /* 0x18...0x1b */
44 0x0000, 0x0000, 0x0000, 0x0000, /* 0x1c...0x1f */
45 0x0038, 0x000b, 0x0032, 0x0000, /* 0x20...0x23 */
46 0x0008, 0x000c, 0x0093, 0x00e9, /* 0x24...0x27 */
47 0x0000, 0x0000, 0x0000, 0x0000, /* 0x28...0x2b */
48 0x0033, 0x0010, 0x0010, 0x0100, /* 0x2c...0x2f */
49 0x0100, 0x0002, 0x0001, 0x0001, /* 0x30...0x33 */
50 0x0039, 0x0039, 0x0039, 0x0039, /* 0x34...0x37 */
51 0x0001, 0x0001, /* 0x38...0x3b */
52};
53
54/* codec private data */
55struct wm8978_priv {
56 struct snd_soc_codec codec;
57 unsigned int f_pllout;
58 unsigned int f_mclk;
59 unsigned int f_256fs;
60 unsigned int f_opclk;
b0580913 61 int mclk_idx;
0d34e915
GL		 62 enum wm8978_sysclk_src sysclk;
63 u16 reg_cache[WM8978_CACHEREGNUM];
64};
65
66static const char *wm8978_companding[] = {"Off", "NC", "u-law", "A-law"};
67static const char *wm8978_eqmode[] = {"Capture", "Playback"};
68static const char *wm8978_bw[] = {"Narrow", "Wide"};
69static const char *wm8978_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz"};
70static const char *wm8978_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz"};
71static const char *wm8978_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz"};
72static const char *wm8978_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz"};
73static const char *wm8978_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz"};
74static const char *wm8978_alc3[] = {"ALC", "Limiter"};
75static const char *wm8978_alc1[] = {"Off", "Right", "Left", "Both"};
76
77static const SOC_ENUM_SINGLE_DECL(adc_compand, WM8978_COMPANDING_CONTROL, 1,
78 wm8978_companding);
79static const SOC_ENUM_SINGLE_DECL(dac_compand, WM8978_COMPANDING_CONTROL, 3,
80 wm8978_companding);
81static const SOC_ENUM_SINGLE_DECL(eqmode, WM8978_EQ1, 8, wm8978_eqmode);
82static const SOC_ENUM_SINGLE_DECL(eq1, WM8978_EQ1, 5, wm8978_eq1);
83static const SOC_ENUM_SINGLE_DECL(eq2bw, WM8978_EQ2, 8, wm8978_bw);
84static const SOC_ENUM_SINGLE_DECL(eq2, WM8978_EQ2, 5, wm8978_eq2);
85static const SOC_ENUM_SINGLE_DECL(eq3bw, WM8978_EQ3, 8, wm8978_bw);
86static const SOC_ENUM_SINGLE_DECL(eq3, WM8978_EQ3, 5, wm8978_eq3);
87static const SOC_ENUM_SINGLE_DECL(eq4bw, WM8978_EQ4, 8, wm8978_bw);
88static const SOC_ENUM_SINGLE_DECL(eq4, WM8978_EQ4, 5, wm8978_eq4);
89static const SOC_ENUM_SINGLE_DECL(eq5, WM8978_EQ5, 5, wm8978_eq5);
90static const SOC_ENUM_SINGLE_DECL(alc3, WM8978_ALC_CONTROL_3, 8, wm8978_alc3);
91static const SOC_ENUM_SINGLE_DECL(alc1, WM8978_ALC_CONTROL_1, 7, wm8978_alc1);
92
93static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
94static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
95static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
96static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);
97static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1);
98
99static const struct snd_kcontrol_new wm8978_snd_controls[] = {
100
101 SOC_SINGLE("Digital Loopback Switch",
102 WM8978_COMPANDING_CONTROL, 0, 1, 0),
103
104 SOC_ENUM("ADC Companding", adc_compand),
105 SOC_ENUM("DAC Companding", dac_compand),
106
107 SOC_DOUBLE("DAC Inversion Switch", WM8978_DAC_CONTROL, 0, 1, 1, 0),
108
109 SOC_DOUBLE_R_TLV("PCM Volume",
110 WM8978_LEFT_DAC_DIGITAL_VOLUME, WM8978_RIGHT_DAC_DIGITAL_VOLUME,
111 0, 255, 0, digital_tlv),
112
113 SOC_SINGLE("High Pass Filter Switch", WM8978_ADC_CONTROL, 8, 1, 0),
114 SOC_SINGLE("High Pass Cut Off", WM8978_ADC_CONTROL, 4, 7, 0),
115 SOC_DOUBLE("ADC Inversion Switch", WM8978_ADC_CONTROL, 0, 1, 1, 0),
116
117 SOC_DOUBLE_R_TLV("ADC Volume",
118 WM8978_LEFT_ADC_DIGITAL_VOLUME, WM8978_RIGHT_ADC_DIGITAL_VOLUME,
119 0, 255, 0, digital_tlv),
120
121 SOC_ENUM("Equaliser Function", eqmode),
122 SOC_ENUM("EQ1 Cut Off", eq1),
123 SOC_SINGLE_TLV("EQ1 Volume", WM8978_EQ1, 0, 24, 1, eq_tlv),
124
125 SOC_ENUM("Equaliser EQ2 Bandwith", eq2bw),
126 SOC_ENUM("EQ2 Cut Off", eq2),
127 SOC_SINGLE_TLV("EQ2 Volume", WM8978_EQ2, 0, 24, 1, eq_tlv),
128
129 SOC_ENUM("Equaliser EQ3 Bandwith", eq3bw),
130 SOC_ENUM("EQ3 Cut Off", eq3),
131 SOC_SINGLE_TLV("EQ3 Volume", WM8978_EQ3, 0, 24, 1, eq_tlv),
132
133 SOC_ENUM("Equaliser EQ4 Bandwith", eq4bw),
134 SOC_ENUM("EQ4 Cut Off", eq4),
135 SOC_SINGLE_TLV("EQ4 Volume", WM8978_EQ4, 0, 24, 1, eq_tlv),
136
137 SOC_ENUM("EQ5 Cut Off", eq5),
138 SOC_SINGLE_TLV("EQ5 Volume", WM8978_EQ5, 0, 24, 1, eq_tlv),
139
140 SOC_SINGLE("DAC Playback Limiter Switch",
141 WM8978_DAC_LIMITER_1, 8, 1, 0),
142 SOC_SINGLE("DAC Playback Limiter Decay",
143 WM8978_DAC_LIMITER_1, 4, 15, 0),
144 SOC_SINGLE("DAC Playback Limiter Attack",
145 WM8978_DAC_LIMITER_1, 0, 15, 0),
146
147 SOC_SINGLE("DAC Playback Limiter Threshold",
148 WM8978_DAC_LIMITER_2, 4, 7, 0),
149 SOC_SINGLE("DAC Playback Limiter Boost",
150 WM8978_DAC_LIMITER_2, 0, 15, 0),
151
152 SOC_ENUM("ALC Enable Switch", alc1),
153 SOC_SINGLE("ALC Capture Min Gain", WM8978_ALC_CONTROL_1, 0, 7, 0),
154 SOC_SINGLE("ALC Capture Max Gain", WM8978_ALC_CONTROL_1, 3, 7, 0),
155
156 SOC_SINGLE("ALC Capture Hold", WM8978_ALC_CONTROL_2, 4, 7, 0),
157 SOC_SINGLE("ALC Capture Target", WM8978_ALC_CONTROL_2, 0, 15, 0),
158
159 SOC_ENUM("ALC Capture Mode", alc3),
160 SOC_SINGLE("ALC Capture Decay", WM8978_ALC_CONTROL_3, 4, 15, 0),
161 SOC_SINGLE("ALC Capture Attack", WM8978_ALC_CONTROL_3, 0, 15, 0),
162
163 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8978_NOISE_GATE, 3, 1, 0),
164 SOC_SINGLE("ALC Capture Noise Gate Threshold",
165 WM8978_NOISE_GATE, 0, 7, 0),
166
167 SOC_DOUBLE_R("Capture PGA ZC Switch",
168 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
169 7, 1, 0),
170
171 /* OUT1 - Headphones */
172 SOC_DOUBLE_R("Headphone Playback ZC Switch",
173 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 7, 1, 0),
174
175 SOC_DOUBLE_R_TLV("Headphone Playback Volume",
176 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL,
177 0, 63, 0, spk_tlv),
178
179 /* OUT2 - Speakers */
180 SOC_DOUBLE_R("Speaker Playback ZC Switch",
181 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 7, 1, 0),
182
183 SOC_DOUBLE_R_TLV("Speaker Playback Volume",
184 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL,
185 0, 63, 0, spk_tlv),
186
187 /* OUT3/4 - Line Output */
188 SOC_DOUBLE_R("Line Playback Switch",
189 WM8978_OUT3_MIXER_CONTROL, WM8978_OUT4_MIXER_CONTROL, 6, 1, 1),
190
191 /* Mixer #3: Boost (Input) mixer */
192 SOC_DOUBLE_R("PGA Boost (+20dB)",
193 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
194 8, 1, 0),
195 SOC_DOUBLE_R_TLV("L2/R2 Boost Volume",
196 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
197 4, 7, 0, boost_tlv),
198 SOC_DOUBLE_R_TLV("Aux Boost Volume",
199 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
200 0, 7, 0, boost_tlv),
201
202 /* Input PGA volume */
203 SOC_DOUBLE_R_TLV("Input PGA Volume",
204 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
205 0, 63, 0, inpga_tlv),
206
207 /* Headphone */
208 SOC_DOUBLE_R("Headphone Switch",
209 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 6, 1, 1),
210
211 /* Speaker */
212 SOC_DOUBLE_R("Speaker Switch",
213 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 6, 1, 1),
b2c3e923
GL		 214
215 /* DAC / ADC oversampling */
216 SOC_SINGLE("DAC 128x Oversampling Switch", WM8978_DAC_CONTROL, 8, 1, 0),
217 SOC_SINGLE("ADC 128x Oversampling Switch", WM8978_ADC_CONTROL, 8, 1, 0),
0d34e915
GL		 218};
219
220/* Mixer #1: Output (OUT1, OUT2) Mixer: mix AUX, Input mixer output and DAC */
221static const struct snd_kcontrol_new wm8978_left_out_mixer[] = {
222 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_LEFT_MIXER_CONTROL, 1, 1, 0),
223 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_LEFT_MIXER_CONTROL, 5, 1, 0),
224 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_LEFT_MIXER_CONTROL, 0, 1, 0),
225};
226
227static const struct snd_kcontrol_new wm8978_right_out_mixer[] = {
228 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_RIGHT_MIXER_CONTROL, 1, 1, 0),
229 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 5, 1, 0),
230 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 0, 1, 0),
231};
232
233/* OUT3/OUT4 Mixer not implemented */
234
235/* Mixer #2: Input PGA Mute */
236static const struct snd_kcontrol_new wm8978_left_input_mixer[] = {
237 SOC_DAPM_SINGLE("L2 Switch", WM8978_INPUT_CONTROL, 2, 1, 0),
238 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 1, 1, 0),
239 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 0, 1, 0),
240};
241static const struct snd_kcontrol_new wm8978_right_input_mixer[] = {
242 SOC_DAPM_SINGLE("R2 Switch", WM8978_INPUT_CONTROL, 6, 1, 0),
243 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 5, 1, 0),
244 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 4, 1, 0),
245};
246
247static const struct snd_soc_dapm_widget wm8978_dapm_widgets[] = {
248 SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback",
249 WM8978_POWER_MANAGEMENT_3, 0, 0),
250 SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback",
251 WM8978_POWER_MANAGEMENT_3, 1, 0),
252 SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture",
253 WM8978_POWER_MANAGEMENT_2, 0, 0),
254 SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture",
255 WM8978_POWER_MANAGEMENT_2, 1, 0),
256
257 /* Mixer #1: OUT1,2 */
258 SOC_MIXER_ARRAY("Left Output Mixer", WM8978_POWER_MANAGEMENT_3,
259 2, 0, wm8978_left_out_mixer),
260 SOC_MIXER_ARRAY("Right Output Mixer", WM8978_POWER_MANAGEMENT_3,
261 3, 0, wm8978_right_out_mixer),
262
263 SOC_MIXER_ARRAY("Left Input Mixer", WM8978_POWER_MANAGEMENT_2,
264 2, 0, wm8978_left_input_mixer),
265 SOC_MIXER_ARRAY("Right Input Mixer", WM8978_POWER_MANAGEMENT_2,
266 3, 0, wm8978_right_input_mixer),
267
268 SND_SOC_DAPM_PGA("Left Boost Mixer", WM8978_POWER_MANAGEMENT_2,
269 4, 0, NULL, 0),
270 SND_SOC_DAPM_PGA("Right Boost Mixer", WM8978_POWER_MANAGEMENT_2,
271 5, 0, NULL, 0),
272
273 SND_SOC_DAPM_PGA("Left Capture PGA", WM8978_LEFT_INP_PGA_CONTROL,
274 6, 1, NULL, 0),
275 SND_SOC_DAPM_PGA("Right Capture PGA", WM8978_RIGHT_INP_PGA_CONTROL,
276 6, 1, NULL, 0),
277
278 SND_SOC_DAPM_PGA("Left Headphone Out", WM8978_POWER_MANAGEMENT_2,
279 7, 0, NULL, 0),
280 SND_SOC_DAPM_PGA("Right Headphone Out", WM8978_POWER_MANAGEMENT_2,
281 8, 0, NULL, 0),
282
283 SND_SOC_DAPM_PGA("Left Speaker Out", WM8978_POWER_MANAGEMENT_3,
284 6, 0, NULL, 0),
285 SND_SOC_DAPM_PGA("Right Speaker Out", WM8978_POWER_MANAGEMENT_3,
286 5, 0, NULL, 0),
287
288 SND_SOC_DAPM_MIXER("OUT4 VMID", WM8978_POWER_MANAGEMENT_3,
289 8, 0, NULL, 0),
290
291 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8978_POWER_MANAGEMENT_1, 4, 0),
292
293 SND_SOC_DAPM_INPUT("LMICN"),
294 SND_SOC_DAPM_INPUT("LMICP"),
295 SND_SOC_DAPM_INPUT("RMICN"),
296 SND_SOC_DAPM_INPUT("RMICP"),
297 SND_SOC_DAPM_INPUT("LAUX"),
298 SND_SOC_DAPM_INPUT("RAUX"),
299 SND_SOC_DAPM_INPUT("L2"),
300 SND_SOC_DAPM_INPUT("R2"),
301 SND_SOC_DAPM_OUTPUT("LHP"),
302 SND_SOC_DAPM_OUTPUT("RHP"),
303 SND_SOC_DAPM_OUTPUT("LSPK"),
304 SND_SOC_DAPM_OUTPUT("RSPK"),
305};
306
307static const struct snd_soc_dapm_route audio_map[] = {
308 /* Output mixer */
309 {"Right Output Mixer", "PCM Playback Switch", "Right DAC"},
310 {"Right Output Mixer", "Aux Playback Switch", "RAUX"},
311 {"Right Output Mixer", "Line Bypass Switch", "Right Boost Mixer"},
312
313 {"Left Output Mixer", "PCM Playback Switch", "Left DAC"},
314 {"Left Output Mixer", "Aux Playback Switch", "LAUX"},
315 {"Left Output Mixer", "Line Bypass Switch", "Left Boost Mixer"},
316
317 /* Outputs */
318 {"Right Headphone Out", NULL, "Right Output Mixer"},
319 {"RHP", NULL, "Right Headphone Out"},
320
321 {"Left Headphone Out", NULL, "Left Output Mixer"},
322 {"LHP", NULL, "Left Headphone Out"},
323
324 {"Right Speaker Out", NULL, "Right Output Mixer"},
325 {"RSPK", NULL, "Right Speaker Out"},
326
327 {"Left Speaker Out", NULL, "Left Output Mixer"},
328 {"LSPK", NULL, "Left Speaker Out"},
329
330 /* Boost Mixer */
331 {"Right ADC", NULL, "Right Boost Mixer"},
332
333 {"Right Boost Mixer", NULL, "RAUX"},
334 {"Right Boost Mixer", NULL, "Right Capture PGA"},
335 {"Right Boost Mixer", NULL, "R2"},
336
337 {"Left ADC", NULL, "Left Boost Mixer"},
338
339 {"Left Boost Mixer", NULL, "LAUX"},
340 {"Left Boost Mixer", NULL, "Left Capture PGA"},
341 {"Left Boost Mixer", NULL, "L2"},
342
343 /* Input PGA */
344 {"Right Capture PGA", NULL, "Right Input Mixer"},
345 {"Left Capture PGA", NULL, "Left Input Mixer"},
346
347 {"Right Input Mixer", "R2 Switch", "R2"},
348 {"Right Input Mixer", "MicN Switch", "RMICN"},
349 {"Right Input Mixer", "MicP Switch", "RMICP"},
350
351 {"Left Input Mixer", "L2 Switch", "L2"},
352 {"Left Input Mixer", "MicN Switch", "LMICN"},
353 {"Left Input Mixer", "MicP Switch", "LMICP"},
354};
355
356static int wm8978_add_widgets(struct snd_soc_codec *codec)
357{
358 snd_soc_dapm_new_controls(codec, wm8978_dapm_widgets,
359 ARRAY_SIZE(wm8978_dapm_widgets));
360
361 /* set up the WM8978 audio map */
362 snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
363
364 return 0;
365}
366
367/* PLL divisors */
368struct wm8978_pll_div {
369 u32 k;
370 u8 n;
371 u8 div2;
372};
373
374#define FIXED_PLL_SIZE (1 << 24)
375
376static void pll_factors(struct wm8978_pll_div *pll_div, unsigned int target,
377 unsigned int source)
378{
379 u64 k_part;
380 unsigned int k, n_div, n_mod;
381
382 n_div = target / source;
383 if (n_div < 6) {
384 source >>= 1;
385 pll_div->div2 = 1;
386 n_div = target / source;
387 } else {
388 pll_div->div2 = 0;
389 }
390
391 if (n_div < 6 || n_div > 12)
392 dev_warn(wm8978_codec->dev,
393 "WM8978 N value exceeds recommended range! N = %u\n",
394 n_div);
395
396 pll_div->n = n_div;
397 n_mod = target - source * n_div;
398 k_part = FIXED_PLL_SIZE * (long long)n_mod + source / 2;
399
400 do_div(k_part, source);
401
402 k = k_part & 0xFFFFFFFF;
403
404 pll_div->k = k;
405}
b0580913
GL		 406
407/* MCLK dividers */
408static const int mclk_numerator[] = {1, 3, 2, 3, 4, 6, 8, 12};
409static const int mclk_denominator[] = {1, 2, 1, 1, 1, 1, 1, 1};
410
411/*
412 * find index >= idx, such that, for a given f_out,
413 * 3 * f_mclk / 4 <= f_PLLOUT < 13 * f_mclk / 4
414 * f_out can be f_256fs or f_opclk, currently only used for f_256fs. Can be
415 * generalised for f_opclk with suitable coefficient arrays, but currently
416 * the OPCLK divisor is calculated directly, not iteratively.
417 */
418static int wm8978_enum_mclk(unsigned int f_out, unsigned int f_mclk,
419 unsigned int *f_pllout)
420{
421 int i;
422
423 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
424 unsigned int f_pllout_x4 = 4 * f_out * mclk_numerator[i] /
425 mclk_denominator[i];
426 if (3 * f_mclk <= f_pllout_x4 && f_pllout_x4 < 13 * f_mclk) {
427 *f_pllout = f_pllout_x4 / 4;
428 return i;
429 }
430 }
431
432 return -EINVAL;
433}
434
0d34e915
GL		 435/*
436 * Calculate internal frequencies and dividers, according to Figure 40
437 * "PLL and Clock Select Circuit" in WM8978 datasheet Rev. 2.6
438 */
439static int wm8978_configure_pll(struct snd_soc_codec *codec)
440{
441 struct wm8978_priv *wm8978 = codec->private_data;
442 struct wm8978_pll_div pll_div;
443 unsigned int f_opclk = wm8978->f_opclk, f_mclk = wm8978->f_mclk,
444 f_256fs = wm8978->f_256fs;
b0580913 445 unsigned int f2;
0d34e915
GL		 446
447 if (!f_mclk)
448 return -EINVAL;
449
450 if (f_opclk) {
b0580913
GL		 451 unsigned int opclk_div;
452 /* Cannot set up MCLK divider now, do later */
453 wm8978->mclk_idx = -1;
454
0d34e915
GL		 455 /*
456 * The user needs OPCLK. Choose OPCLKDIV to put
457 * 6 <= R = f2 / f1 < 13, 1 <= OPCLKDIV <= 4.
458 * f_opclk = f_mclk * prescale * R / 4 / OPCLKDIV, where
459 * prescale = 1, or prescale = 2. Prescale is calculated inside
460 * pll_factors(). We have to select f_PLLOUT, such that
461 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
462 * f_mclk * 3 / 16 <= f_opclk < f_mclk * 13 / 4.
463 */
464 if (16 * f_opclk < 3 * f_mclk || 4 * f_opclk >= 13 * f_mclk)
465 return -EINVAL;
466
467 if (4 * f_opclk < 3 * f_mclk)
468 /* Have to use OPCLKDIV */
469 opclk_div = (3 * f_mclk / 4 + f_opclk - 1) / f_opclk;
470 else
471 opclk_div = 1;
472
473 dev_dbg(codec->dev, "%s: OPCLKDIV=%d\n", __func__, opclk_div);
474
475 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 0x30,
476 (opclk_div - 1) << 4);
477
478 wm8978->f_pllout = f_opclk * opclk_div;
479 } else if (f_256fs) {
480 /*
b0580913 481 * Not using OPCLK, but PLL is used for the codec, choose R:
0d34e915
GL		 482 * 6 <= R = f2 / f1 < 13, to put 1 <= MCLKDIV <= 12.
483 * f_256fs = f_mclk * prescale * R / 4 / MCLKDIV, where
484 * prescale = 1, or prescale = 2. Prescale is calculated inside
485 * pll_factors(). We have to select f_PLLOUT, such that
486 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
487 * f_mclk * 3 / 48 <= f_256fs < f_mclk * 13 / 4. This means MCLK
488 * must be 3.781MHz <= f_MCLK <= 32.768MHz
489 */
b0580913
GL		 490 int idx = wm8978_enum_mclk(f_256fs, f_mclk, &wm8978->f_pllout);
491 if (idx < 0)
492 return idx;
0d34e915 493
b0580913 494 wm8978->mclk_idx = idx;
0d34e915
GL		 495
496 /* GPIO1 into default mode as input - before configuring PLL */
497 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
498 } else {
499 return -EINVAL;
500 }
501
502 f2 = wm8978->f_pllout * 4;
503
504 dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__,
505 wm8978->f_mclk, wm8978->f_pllout);
506
507 pll_factors(&pll_div, f2, wm8978->f_mclk);
508
509 dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n",
510 __func__, pll_div.n, pll_div.k, pll_div.div2);
511
512 /* Turn PLL off for configuration... */
513 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
514
515 snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n);
516 snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18);
517 snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff);
518 snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff);
519
520 /* ...and on again */
521 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
522
523 if (f_opclk)
524 /* Output PLL (OPCLK) to GPIO1 */
525 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4);
526
527 return 0;
528}
529
530/*
531 * Configure WM8978 clock dividers.
532 */
533static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
534 int div_id, int div)
535{
536 struct snd_soc_codec *codec = codec_dai->codec;
537 struct wm8978_priv *wm8978 = codec->private_data;
538 int ret = 0;
539
540 switch (div_id) {
541 case WM8978_OPCLKRATE:
542 wm8978->f_opclk = div;
543
544 if (wm8978->f_mclk)
b0580913
GL		 545 /*
546 * We know the MCLK frequency, the user has requested
547 * OPCLK, configure the PLL based on that and start it
548 * and OPCLK immediately. We will configure PLL to match
549 * user-requested OPCLK frquency as good as possible.
550 * In fact, it is likely, that matching the sampling
551 * rate, when it becomes known, is more important, and
552 * we will not be reconfiguring PLL then, because we
553 * must not interrupt OPCLK. But it should be fine,
554 * because typically the user will request OPCLK to run
555 * at 256fs or 512fs, and for these cases we will also
556 * find an exact MCLK divider configuration - it will
557 * be equal to or double the OPCLK divisor.
558 */
0d34e915
GL		 559 ret = wm8978_configure_pll(codec);
560 break;
0d34e915
GL		 561 case WM8978_BCLKDIV:
562 if (div & ~0x1c)
563 return -EINVAL;
564 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div);
565 break;
566 default:
567 return -EINVAL;
568 }
569
570 dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div);
571
572 return ret;
573}
574
575/*
576 * @freq: when .set_pll() us not used, freq is codec MCLK input frequency
577 */
578static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
579 unsigned int freq, int dir)
580{
581 struct snd_soc_codec *codec = codec_dai->codec;
582 struct wm8978_priv *wm8978 = codec->private_data;
583 int ret = 0;
584
585 dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq);
586
587 if (freq) {
588 wm8978->f_mclk = freq;
589
590 /* Even if MCLK is used for system clock, might have to drive OPCLK */
591 if (wm8978->f_opclk)
592 ret = wm8978_configure_pll(codec);
593
594 /* Our sysclk is fixed to 256 * fs, will configure in .hw_params() */
595
596 if (!ret)
597 wm8978->sysclk = clk_id;
598 }
599
600 if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) {
601 /* Clock CODEC directly from MCLK */
602 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
603
604 /* GPIO1 into default mode as input - before configuring PLL */
605 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
606
607 /* Turn off PLL */
608 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
609 wm8978->sysclk = WM8978_MCLK;
610 wm8978->f_pllout = 0;
611 wm8978->f_opclk = 0;
612 }
613
614 return ret;
615}
616
617/*
618 * Set ADC and Voice DAC format.
619 */
620static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
621{
622 struct snd_soc_codec *codec = codec_dai->codec;
623 /*
624 * BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80,
625 * Data Format mask = 0x18: all will be calculated anew
626 */
627 u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198;
628 u16 clk = snd_soc_read(codec, WM8978_CLOCKING);
629
630 dev_dbg(codec->dev, "%s\n", __func__);
631
632 /* set master/slave audio interface */
633 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
634 case SND_SOC_DAIFMT_CBM_CFM:
635 clk |= 1;
636 break;
637 case SND_SOC_DAIFMT_CBS_CFS:
638 clk &= ~1;
639 break;
640 default:
641 return -EINVAL;
642 }
643
644 /* interface format */
645 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
646 case SND_SOC_DAIFMT_I2S:
647 iface |= 0x10;
648 break;
649 case SND_SOC_DAIFMT_RIGHT_J:
650 break;
651 case SND_SOC_DAIFMT_LEFT_J:
652 iface |= 0x8;
653 break;
654 case SND_SOC_DAIFMT_DSP_A:
655 iface |= 0x18;
656 break;
657 default:
658 return -EINVAL;
659 }
660
661 /* clock inversion */
662 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
663 case SND_SOC_DAIFMT_NB_NF:
664 break;
665 case SND_SOC_DAIFMT_IB_IF:
666 iface |= 0x180;
667 break;
668 case SND_SOC_DAIFMT_IB_NF:
669 iface |= 0x100;
670 break;
671 case SND_SOC_DAIFMT_NB_IF:
672 iface |= 0x80;
673 break;
674 default:
675 return -EINVAL;
676 }
677
678 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface);
679 snd_soc_write(codec, WM8978_CLOCKING, clk);
680
681 return 0;
682}
683
0d34e915
GL		 684/*
685 * Set PCM DAI bit size and sample rate.
686 */
687static int wm8978_hw_params(struct snd_pcm_substream *substream,
688 struct snd_pcm_hw_params *params,
689 struct snd_soc_dai *dai)
690{
691 struct snd_soc_pcm_runtime *rtd = substream->private_data;
692 struct snd_soc_device *socdev = rtd->socdev;
693 struct snd_soc_codec *codec = socdev->card->codec;
694 struct wm8978_priv *wm8978 = codec->private_data;
695 /* Word length mask = 0x60 */
696 u16 iface_ctl = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x60;
697 /* Sampling rate mask = 0xe (for filters) */
698 u16 add_ctl = snd_soc_read(codec, WM8978_ADDITIONAL_CONTROL) & ~0xe;
699 u16 clking = snd_soc_read(codec, WM8978_CLOCKING);
700 enum wm8978_sysclk_src current_clk_id = clking & 0x100 ?
701 WM8978_PLL : WM8978_MCLK;
702 unsigned int f_sel, diff, diff_best = INT_MAX;
703 int i, best = 0;
704
705 if (!wm8978->f_mclk)
706 return -EINVAL;
707
708 /* bit size */
709 switch (params_format(params)) {
710 case SNDRV_PCM_FORMAT_S16_LE:
711 break;
712 case SNDRV_PCM_FORMAT_S20_3LE:
713 iface_ctl |= 0x20;
714 break;
715 case SNDRV_PCM_FORMAT_S24_LE:
716 iface_ctl |= 0x40;
717 break;
718 case SNDRV_PCM_FORMAT_S32_LE:
719 iface_ctl |= 0x60;
720 break;
721 }
722
723 /* filter coefficient */
724 switch (params_rate(params)) {
725 case 8000:
726 add_ctl |= 0x5 << 1;
727 break;
728 case 11025:
729 add_ctl |= 0x4 << 1;
730 break;
731 case 16000:
732 add_ctl |= 0x3 << 1;
733 break;
734 case 22050:
735 add_ctl |= 0x2 << 1;
736 break;
737 case 32000:
738 add_ctl |= 0x1 << 1;
739 break;
740 case 44100:
741 case 48000:
742 break;
743 }
744
745 /* Sampling rate is known now, can configure the MCLK divider */
746 wm8978->f_256fs = params_rate(params) * 256;
747
748 if (wm8978->sysclk == WM8978_MCLK) {
b0580913 749 wm8978->mclk_idx = -1;
0d34e915
GL		 750 f_sel = wm8978->f_mclk;
751 } else {
752 if (!wm8978->f_pllout) {
b0580913 753 /* We only enter here, if OPCLK is not used */
0d34e915
GL		 754 int ret = wm8978_configure_pll(codec);
755 if (ret < 0)
756 return ret;
757 }
758 f_sel = wm8978->f_pllout;
759 }
760
b0580913
GL		 761 if (wm8978->mclk_idx < 0) {
762 /* Either MCLK is used directly, or OPCLK is used */
763 if (f_sel < wm8978->f_256fs || f_sel > 12 * wm8978->f_256fs)
764 return -EINVAL;
0d34e915 765
b0580913
GL		 766 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
767 diff = abs(wm8978->f_256fs * 3 -
768 f_sel * 3 * mclk_denominator[i] / mclk_numerator[i]);
0d34e915 769
b0580913
GL		 770 if (diff < diff_best) {
771 diff_best = diff;
772 best = i;
773 }
0d34e915 774
b0580913
GL		 775 if (!diff)
776 break;
777 }
778 } else {
779 /* OPCLK not used, codec driven by PLL */
780 best = wm8978->mclk_idx;
781 diff = 0;
0d34e915
GL		 782 }
783
784 if (diff)
b0580913
GL		 785 dev_warn(codec->dev, "Imprecise sampling rate: %uHz%s\n",
786 f_sel * mclk_denominator[best] / mclk_numerator[best] / 256,
787 wm8978->sysclk == WM8978_MCLK ?
788 ", consider using PLL" : "");
0d34e915
GL		 789
790 dev_dbg(codec->dev, "%s: fmt %d, rate %u, MCLK divisor #%d\n", __func__,
791 params_format(params), params_rate(params), best);
792
793 /* MCLK divisor mask = 0xe0 */
794 snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, best << 5);
795
796 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface_ctl);
797 snd_soc_write(codec, WM8978_ADDITIONAL_CONTROL, add_ctl);
798
799 if (wm8978->sysclk != current_clk_id) {
800 if (wm8978->sysclk == WM8978_PLL)
801 /* Run CODEC from PLL instead of MCLK */
802 snd_soc_update_bits(codec, WM8978_CLOCKING,
803 0x100, 0x100);
804 else
805 /* Clock CODEC directly from MCLK */
806 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
807 }
808
809 return 0;
810}
811
812static int wm8978_mute(struct snd_soc_dai *dai, int mute)
813{
814 struct snd_soc_codec *codec = dai->codec;
815
816 dev_dbg(codec->dev, "%s: %d\n", __func__, mute);
817
818 if (mute)
819 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0x40);
820 else
821 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0);
822
823 return 0;
824}
825
826static int wm8978_set_bias_level(struct snd_soc_codec *codec,
827 enum snd_soc_bias_level level)
828{
829 u16 power1 = snd_soc_read(codec, WM8978_POWER_MANAGEMENT_1) & ~3;
830
831 switch (level) {
832 case SND_SOC_BIAS_ON:
833 case SND_SOC_BIAS_PREPARE:
834 power1 |= 1; /* VMID 75k */
835 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
836 break;
837 case SND_SOC_BIAS_STANDBY:
838 /* bit 3: enable bias, bit 2: enable I/O tie off buffer */
839 power1 |= 0xc;
840
841 if (codec->bias_level == SND_SOC_BIAS_OFF) {
842 /* Initial cap charge at VMID 5k */
843 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1,
844 power1 | 0x3);
845 mdelay(100);
846 }
847
848 power1 |= 0x2; /* VMID 500k */
849 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
850 break;
851 case SND_SOC_BIAS_OFF:
852 /* Preserve PLL - OPCLK may be used by someone */
853 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, ~0x20, 0);
854 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0);
855 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_3, 0);
856 break;
857 }
858
859 dev_dbg(codec->dev, "%s: %d, %x\n", __func__, level, power1);
860
861 codec->bias_level = level;
862 return 0;
863}
864
865#define WM8978_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
866 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
867
868static struct snd_soc_dai_ops wm8978_dai_ops = {
869 .hw_params = wm8978_hw_params,
870 .digital_mute = wm8978_mute,
871 .set_fmt = wm8978_set_dai_fmt,
872 .set_clkdiv = wm8978_set_dai_clkdiv,
873 .set_sysclk = wm8978_set_dai_sysclk,
874};
875
876/* Also supports 12kHz */
877struct snd_soc_dai wm8978_dai = {
878 .name = "WM8978 HiFi",
879 .id = 1,
880 .playback = {
881 .stream_name = "Playback",
882 .channels_min = 1,
883 .channels_max = 2,
884 .rates = SNDRV_PCM_RATE_8000_48000,
885 .formats = WM8978_FORMATS,
886 },
887 .capture = {
888 .stream_name = "Capture",
889 .channels_min = 1,
890 .channels_max = 2,
891 .rates = SNDRV_PCM_RATE_8000_48000,
892 .formats = WM8978_FORMATS,
893 },
894 .ops = &wm8978_dai_ops,
895};
896EXPORT_SYMBOL_GPL(wm8978_dai);
897
898static int wm8978_suspend(struct platform_device *pdev, pm_message_t state)
899{
900 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
901 struct snd_soc_codec *codec = socdev->card->codec;
902
903 wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
904 /* Also switch PLL off */
905 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0);
0d34e915
GL		 906
907 return 0;
908}
909
910static int wm8978_resume(struct platform_device *pdev)
911{
912 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
913 struct snd_soc_codec *codec = socdev->card->codec;
914 struct wm8978_priv *wm8978 = codec->private_data;
915 int i;
916 u16 *cache = codec->reg_cache;
917
0d34e915
GL		 918 /* Sync reg_cache with the hardware */
919 for (i = 0; i < ARRAY_SIZE(wm8978_reg); i++) {
920 if (i == WM8978_RESET)
921 continue;
922 if (cache[i] != wm8978_reg[i])
923 snd_soc_write(codec, i, cache[i]);
924 }
925
926 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
927
928 if (wm8978->f_pllout)
929 /* Switch PLL on */
930 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
931
932 return 0;
933}
934
935static int wm8978_probe(struct platform_device *pdev)
936{
937 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
938 struct snd_soc_codec *codec;
939 int ret = 0;
940
941 if (wm8978_codec == NULL) {
942 dev_err(&pdev->dev, "Codec device not registered\n");
943 return -ENODEV;
944 }
945
946 socdev->card->codec = wm8978_codec;
947 codec = wm8978_codec;
948
949 /* register pcms */
950 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
951 if (ret < 0) {
952 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
953 goto pcm_err;
954 }
955
956 snd_soc_add_controls(codec, wm8978_snd_controls,
957 ARRAY_SIZE(wm8978_snd_controls));
958 wm8978_add_widgets(codec);
959
960pcm_err:
961 return ret;
962}
963
964/* power down chip */
965static int wm8978_remove(struct platform_device *pdev)
966{
967 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
968
969 snd_soc_free_pcms(socdev);
970 snd_soc_dapm_free(socdev);
971
972 return 0;
973}
974
975struct snd_soc_codec_device soc_codec_dev_wm8978 = {
976 .probe = wm8978_probe,
977 .remove = wm8978_remove,
978 .suspend = wm8978_suspend,
979 .resume = wm8978_resume,
980};
981EXPORT_SYMBOL_GPL(soc_codec_dev_wm8978);
982
983/*
984 * These registers contain an "update" bit - bit 8. This means, for example,
985 * that one can write new DAC digital volume for both channels, but only when
986 * the update bit is set, will also the volume be updated - simultaneously for
987 * both channels.
988 */
989static const int update_reg[] = {
990 WM8978_LEFT_DAC_DIGITAL_VOLUME,
991 WM8978_RIGHT_DAC_DIGITAL_VOLUME,
992 WM8978_LEFT_ADC_DIGITAL_VOLUME,
993 WM8978_RIGHT_ADC_DIGITAL_VOLUME,
994 WM8978_LEFT_INP_PGA_CONTROL,
995 WM8978_RIGHT_INP_PGA_CONTROL,
996 WM8978_LOUT1_HP_CONTROL,
997 WM8978_ROUT1_HP_CONTROL,
998 WM8978_LOUT2_SPK_CONTROL,
999 WM8978_ROUT2_SPK_CONTROL,
1000};
1001
1002static __devinit int wm8978_register(struct wm8978_priv *wm8978)
1003{
1004 int ret, i;
1005 struct snd_soc_codec *codec = &wm8978->codec;
1006
1007 if (wm8978_codec) {
1008 dev_err(codec->dev, "Another WM8978 is registered\n");
1009 return -EINVAL;
1010 }
1011
1012 /*
1013 * Set default system clock to PLL, it is more precise, this is also the
1014 * default hardware setting
1015 */
1016 wm8978->sysclk = WM8978_PLL;
1017
1018 mutex_init(&codec->mutex);
1019 INIT_LIST_HEAD(&codec->dapm_widgets);
1020 INIT_LIST_HEAD(&codec->dapm_paths);
1021
1022 codec->private_data = wm8978;
1023 codec->name = "WM8978";
1024 codec->owner = THIS_MODULE;
1025 codec->bias_level = SND_SOC_BIAS_OFF;
1026 codec->set_bias_level = wm8978_set_bias_level;
1027 codec->dai = &wm8978_dai;
1028 codec->num_dai = 1;
1029 codec->reg_cache_size = WM8978_CACHEREGNUM;
1030 codec->reg_cache = &wm8978->reg_cache;
1031
1032 ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
1033 if (ret < 0) {
1034 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
1035 goto err;
1036 }
1037
1038 memcpy(codec->reg_cache, wm8978_reg, sizeof(wm8978_reg));
1039
1040 /*
1041 * Set the update bit in all registers, that have one. This way all
1042 * writes to those registers will also cause the update bit to be
1043 * written.
1044 */
1045 for (i = 0; i < ARRAY_SIZE(update_reg); i++)
1046 ((u16 *)codec->reg_cache)[update_reg[i]] |= 0x100;
1047
1048 /* Reset the codec */
1049 ret = snd_soc_write(codec, WM8978_RESET, 0);
1050 if (ret < 0) {
1051 dev_err(codec->dev, "Failed to issue reset\n");
1052 goto err;
1053 }
1054
1055 wm8978_dai.dev = codec->dev;
1056
1057 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
1058
1059 wm8978_codec = codec;
1060
1061 ret = snd_soc_register_codec(codec);
1062 if (ret != 0) {
1063 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
1064 goto err;
1065 }
1066
1067 ret = snd_soc_register_dai(&wm8978_dai);
1068 if (ret != 0) {
1069 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
1070 goto err_codec;
1071 }
1072
1073 return 0;
1074
1075err_codec:
1076 snd_soc_unregister_codec(codec);
1077err:
1078 kfree(wm8978);
1079 return ret;
1080}
1081
1082static __devexit void wm8978_unregister(struct wm8978_priv *wm8978)
1083{
1084 wm8978_set_bias_level(&wm8978->codec, SND_SOC_BIAS_OFF);
1085 snd_soc_unregister_dai(&wm8978_dai);
1086 snd_soc_unregister_codec(&wm8978->codec);
1087 kfree(wm8978);
1088 wm8978_codec = NULL;
1089}
1090
1091static __devinit int wm8978_i2c_probe(struct i2c_client *i2c,
1092 const struct i2c_device_id *id)
1093{
1094 struct wm8978_priv *wm8978;
1095 struct snd_soc_codec *codec;
1096
1097 wm8978 = kzalloc(sizeof(struct wm8978_priv), GFP_KERNEL);
1098 if (wm8978 == NULL)
1099 return -ENOMEM;
1100
1101 codec = &wm8978->codec;
1102 codec->hw_write = (hw_write_t)i2c_master_send;
1103
1104 i2c_set_clientdata(i2c, wm8978);
1105 codec->control_data = i2c;
1106
1107 codec->dev = &i2c->dev;
1108
1109 return wm8978_register(wm8978);
1110}
1111
1112static __devexit int wm8978_i2c_remove(struct i2c_client *client)
1113{
1114 struct wm8978_priv *wm8978 = i2c_get_clientdata(client);
1115 wm8978_unregister(wm8978);
1116 return 0;
1117}
1118
1119static const struct i2c_device_id wm8978_i2c_id[] = {
1120 { "wm8978", 0 },
1121 { }
1122};
1123MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
1124
1125static struct i2c_driver wm8978_i2c_driver = {
1126 .driver = {
1127 .name = "WM8978",
1128 .owner = THIS_MODULE,
1129 },
1130 .probe = wm8978_i2c_probe,
1131 .remove = __devexit_p(wm8978_i2c_remove),
1132 .id_table = wm8978_i2c_id,
1133};
1134
1135static int __init wm8978_modinit(void)
1136{
1137 return i2c_add_driver(&wm8978_i2c_driver);
1138}
1139module_init(wm8978_modinit);
1140
1141static void __exit wm8978_exit(void)
1142{
1143 i2c_del_driver(&wm8978_i2c_driver);
1144}
1145module_exit(wm8978_exit);
1146
1147MODULE_DESCRIPTION("ASoC WM8978 codec driver");
1148MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
1149MODULE_LICENSE("GPL");
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