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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / sound / soc / codecs / wm8978.c
blob85e3e630e763ca841ecd51e40cd66ab7733bcf8d
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/initval.h>
28 #include <sound/tlv.h>
29 #include <asm/div64.h>
30
31 #include "wm8978.h"
32
33 /* wm8978 register cache. Note that register 0 is not included in the cache. */
34 static const u16 wm8978_reg[WM8978_CACHEREGNUM] = {
35 0x0000, 0x0000, 0x0000, 0x0000, /* 0x00...0x03 */
36 0x0050, 0x0000, 0x0140, 0x0000, /* 0x04...0x07 */
37 0x0000, 0x0000, 0x0000, 0x00ff, /* 0x08...0x0b */
38 0x00ff, 0x0000, 0x0100, 0x00ff, /* 0x0c...0x0f */
39 0x00ff, 0x0000, 0x012c, 0x002c, /* 0x10...0x13 */
40 0x002c, 0x002c, 0x002c, 0x0000, /* 0x14...0x17 */
41 0x0032, 0x0000, 0x0000, 0x0000, /* 0x18...0x1b */
42 0x0000, 0x0000, 0x0000, 0x0000, /* 0x1c...0x1f */
43 0x0038, 0x000b, 0x0032, 0x0000, /* 0x20...0x23 */
44 0x0008, 0x000c, 0x0093, 0x00e9, /* 0x24...0x27 */
45 0x0000, 0x0000, 0x0000, 0x0000, /* 0x28...0x2b */
46 0x0033, 0x0010, 0x0010, 0x0100, /* 0x2c...0x2f */
47 0x0100, 0x0002, 0x0001, 0x0001, /* 0x30...0x33 */
48 0x0039, 0x0039, 0x0039, 0x0039, /* 0x34...0x37 */
49 0x0001, 0x0001, /* 0x38...0x3b */
50 };
51
52 /* codec private data */
53 struct wm8978_priv {
54 enum snd_soc_control_type control_type;
55 void *control_data;
56 unsigned int f_pllout;
57 unsigned int f_mclk;
58 unsigned int f_256fs;
59 unsigned int f_opclk;
60 int mclk_idx;
61 enum wm8978_sysclk_src sysclk;
62 };
63
64 static const char *wm8978_companding[] = {"Off", "NC", "u-law", "A-law"};
65 static const char *wm8978_eqmode[] = {"Capture", "Playback"};
66 static const char *wm8978_bw[] = {"Narrow", "Wide"};
67 static const char *wm8978_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz"};
68 static const char *wm8978_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz"};
69 static const char *wm8978_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz"};
70 static const char *wm8978_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz"};
71 static const char *wm8978_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz"};
72 static const char *wm8978_alc3[] = {"ALC", "Limiter"};
73 static const char *wm8978_alc1[] = {"Off", "Right", "Left", "Both"};
74
75 static const SOC_ENUM_SINGLE_DECL(adc_compand, WM8978_COMPANDING_CONTROL, 1,
76 wm8978_companding);
77 static const SOC_ENUM_SINGLE_DECL(dac_compand, WM8978_COMPANDING_CONTROL, 3,
78 wm8978_companding);
79 static const SOC_ENUM_SINGLE_DECL(eqmode, WM8978_EQ1, 8, wm8978_eqmode);
80 static const SOC_ENUM_SINGLE_DECL(eq1, WM8978_EQ1, 5, wm8978_eq1);
81 static const SOC_ENUM_SINGLE_DECL(eq2bw, WM8978_EQ2, 8, wm8978_bw);
82 static const SOC_ENUM_SINGLE_DECL(eq2, WM8978_EQ2, 5, wm8978_eq2);
83 static const SOC_ENUM_SINGLE_DECL(eq3bw, WM8978_EQ3, 8, wm8978_bw);
84 static const SOC_ENUM_SINGLE_DECL(eq3, WM8978_EQ3, 5, wm8978_eq3);
85 static const SOC_ENUM_SINGLE_DECL(eq4bw, WM8978_EQ4, 8, wm8978_bw);
86 static const SOC_ENUM_SINGLE_DECL(eq4, WM8978_EQ4, 5, wm8978_eq4);
87 static const SOC_ENUM_SINGLE_DECL(eq5, WM8978_EQ5, 5, wm8978_eq5);
88 static const SOC_ENUM_SINGLE_DECL(alc3, WM8978_ALC_CONTROL_3, 8, wm8978_alc3);
89 static const SOC_ENUM_SINGLE_DECL(alc1, WM8978_ALC_CONTROL_1, 7, wm8978_alc1);
90
91 static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
92 static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0);
93 static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0);
94 static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0);
95 static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1);
96 static const DECLARE_TLV_DB_SCALE(limiter_tlv, 0, 100, 0);
97
98 static const struct snd_kcontrol_new wm8978_snd_controls[] = {
99
100 SOC_SINGLE("Digital Loopback Switch",
101 WM8978_COMPANDING_CONTROL, 0, 1, 0),
102
103 SOC_ENUM("ADC Companding", adc_compand),
104 SOC_ENUM("DAC Companding", dac_compand),
105
106 SOC_DOUBLE("DAC Inversion Switch", WM8978_DAC_CONTROL, 0, 1, 1, 0),
107
108 SOC_DOUBLE_R_TLV("PCM Volume",
109 WM8978_LEFT_DAC_DIGITAL_VOLUME, WM8978_RIGHT_DAC_DIGITAL_VOLUME,
110 0, 255, 0, digital_tlv),
111
112 SOC_SINGLE("High Pass Filter Switch", WM8978_ADC_CONTROL, 8, 1, 0),
113 SOC_SINGLE("High Pass Cut Off", WM8978_ADC_CONTROL, 4, 7, 0),
114 SOC_DOUBLE("ADC Inversion Switch", WM8978_ADC_CONTROL, 0, 1, 1, 0),
115
116 SOC_DOUBLE_R_TLV("ADC Volume",
117 WM8978_LEFT_ADC_DIGITAL_VOLUME, WM8978_RIGHT_ADC_DIGITAL_VOLUME,
118 0, 255, 0, digital_tlv),
119
120 SOC_ENUM("Equaliser Function", eqmode),
121 SOC_ENUM("EQ1 Cut Off", eq1),
122 SOC_SINGLE_TLV("EQ1 Volume", WM8978_EQ1, 0, 24, 1, eq_tlv),
123
124 SOC_ENUM("Equaliser EQ2 Bandwith", eq2bw),
125 SOC_ENUM("EQ2 Cut Off", eq2),
126 SOC_SINGLE_TLV("EQ2 Volume", WM8978_EQ2, 0, 24, 1, eq_tlv),
127
128 SOC_ENUM("Equaliser EQ3 Bandwith", eq3bw),
129 SOC_ENUM("EQ3 Cut Off", eq3),
130 SOC_SINGLE_TLV("EQ3 Volume", WM8978_EQ3, 0, 24, 1, eq_tlv),
131
132 SOC_ENUM("Equaliser EQ4 Bandwith", eq4bw),
133 SOC_ENUM("EQ4 Cut Off", eq4),
134 SOC_SINGLE_TLV("EQ4 Volume", WM8978_EQ4, 0, 24, 1, eq_tlv),
135
136 SOC_ENUM("EQ5 Cut Off", eq5),
137 SOC_SINGLE_TLV("EQ5 Volume", WM8978_EQ5, 0, 24, 1, eq_tlv),
138
139 SOC_SINGLE("DAC Playback Limiter Switch",
140 WM8978_DAC_LIMITER_1, 8, 1, 0),
141 SOC_SINGLE("DAC Playback Limiter Decay",
142 WM8978_DAC_LIMITER_1, 4, 15, 0),
143 SOC_SINGLE("DAC Playback Limiter Attack",
144 WM8978_DAC_LIMITER_1, 0, 15, 0),
145
146 SOC_SINGLE("DAC Playback Limiter Threshold",
147 WM8978_DAC_LIMITER_2, 4, 7, 0),
148 SOC_SINGLE_TLV("DAC Playback Limiter Volume",
149 WM8978_DAC_LIMITER_2, 0, 12, 0, limiter_tlv),
150
151 SOC_ENUM("ALC Enable Switch", alc1),
152 SOC_SINGLE("ALC Capture Min Gain", WM8978_ALC_CONTROL_1, 0, 7, 0),
153 SOC_SINGLE("ALC Capture Max Gain", WM8978_ALC_CONTROL_1, 3, 7, 0),
154
155 SOC_SINGLE("ALC Capture Hold", WM8978_ALC_CONTROL_2, 4, 10, 0),
156 SOC_SINGLE("ALC Capture Target", WM8978_ALC_CONTROL_2, 0, 15, 0),
157
158 SOC_ENUM("ALC Capture Mode", alc3),
159 SOC_SINGLE("ALC Capture Decay", WM8978_ALC_CONTROL_3, 4, 10, 0),
160 SOC_SINGLE("ALC Capture Attack", WM8978_ALC_CONTROL_3, 0, 10, 0),
161
162 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8978_NOISE_GATE, 3, 1, 0),
163 SOC_SINGLE("ALC Capture Noise Gate Threshold",
164 WM8978_NOISE_GATE, 0, 7, 0),
165
166 SOC_DOUBLE_R("Capture PGA ZC Switch",
167 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
168 7, 1, 0),
169
170 /* OUT1 - Headphones */
171 SOC_DOUBLE_R("Headphone Playback ZC Switch",
172 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 7, 1, 0),
173
174 SOC_DOUBLE_R_TLV("Headphone Playback Volume",
175 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL,
176 0, 63, 0, spk_tlv),
177
178 /* OUT2 - Speakers */
179 SOC_DOUBLE_R("Speaker Playback ZC Switch",
180 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 7, 1, 0),
181
182 SOC_DOUBLE_R_TLV("Speaker Playback Volume",
183 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL,
184 0, 63, 0, spk_tlv),
185
186 /* OUT3/4 - Line Output */
187 SOC_DOUBLE_R("Line Playback Switch",
188 WM8978_OUT3_MIXER_CONTROL, WM8978_OUT4_MIXER_CONTROL, 6, 1, 1),
189
190 /* Mixer #3: Boost (Input) mixer */
191 SOC_DOUBLE_R("PGA Boost (+20dB)",
192 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
193 8, 1, 0),
194 SOC_DOUBLE_R_TLV("L2/R2 Boost Volume",
195 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
196 4, 7, 0, boost_tlv),
197 SOC_DOUBLE_R_TLV("Aux Boost Volume",
198 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
199 0, 7, 0, boost_tlv),
200
201 /* Input PGA volume */
202 SOC_DOUBLE_R_TLV("Input PGA Volume",
203 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
204 0, 63, 0, inpga_tlv),
205
206 /* Headphone */
207 SOC_DOUBLE_R("Headphone Switch",
208 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 6, 1, 1),
209
210 /* Speaker */
211 SOC_DOUBLE_R("Speaker Switch",
212 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 6, 1, 1),
213
214 /* DAC / ADC oversampling */
215 SOC_SINGLE("DAC 128x Oversampling Switch", WM8978_DAC_CONTROL,
216 5, 1, 0),
217 SOC_SINGLE("ADC 128x Oversampling Switch", WM8978_ADC_CONTROL,
218 5, 1, 0),
219 };
220
221 /* Mixer #1: Output (OUT1, OUT2) Mixer: mix AUX, Input mixer output and DAC */
222 static 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
228 static 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 */
237 static 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 };
242 static 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
248 static 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
308 static 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
357 static int wm8978_add_widgets(struct snd_soc_codec *codec)
358 {
359 struct snd_soc_dapm_context *dapm = &codec->dapm;
360
361 snd_soc_dapm_new_controls(dapm, wm8978_dapm_widgets,
362 ARRAY_SIZE(wm8978_dapm_widgets));
363 /* set up the WM8978 audio map */
364 snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
365
366 return 0;
367 }
368
369 /* PLL divisors */
370 struct wm8978_pll_div {
371 u32 k;
372 u8 n;
373 u8 div2;
374 };
375
376 #define FIXED_PLL_SIZE (1 << 24)
377
378 static void pll_factors(struct snd_soc_codec *codec,
379 struct wm8978_pll_div *pll_div, unsigned int target, unsigned int source)
380 {
381 u64 k_part;
382 unsigned int k, n_div, n_mod;
383
384 n_div = target / source;
385 if (n_div < 6) {
386 source >>= 1;
387 pll_div->div2 = 1;
388 n_div = target / source;
389 } else {
390 pll_div->div2 = 0;
391 }
392
393 if (n_div < 6 || n_div > 12)
394 dev_warn(codec->dev,
395 "WM8978 N value exceeds recommended range! N = %u\n",
396 n_div);
397
398 pll_div->n = n_div;
399 n_mod = target - source * n_div;
400 k_part = FIXED_PLL_SIZE * (long long)n_mod + source / 2;
401
402 do_div(k_part, source);
403
404 k = k_part & 0xFFFFFFFF;
405
406 pll_div->k = k;
407 }
408
409 /* MCLK dividers */
410 static const int mclk_numerator[] = {1, 3, 2, 3, 4, 6, 8, 12};
411 static const int mclk_denominator[] = {1, 2, 1, 1, 1, 1, 1, 1};
412
413 /*
414 * find index >= idx, such that, for a given f_out,
415 * 3 * f_mclk / 4 <= f_PLLOUT < 13 * f_mclk / 4
416 * f_out can be f_256fs or f_opclk, currently only used for f_256fs. Can be
417 * generalised for f_opclk with suitable coefficient arrays, but currently
418 * the OPCLK divisor is calculated directly, not iteratively.
419 */
420 static int wm8978_enum_mclk(unsigned int f_out, unsigned int f_mclk,
421 unsigned int *f_pllout)
422 {
423 int i;
424
425 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
426 unsigned int f_pllout_x4 = 4 * f_out * mclk_numerator[i] /
427 mclk_denominator[i];
428 if (3 * f_mclk <= f_pllout_x4 && f_pllout_x4 < 13 * f_mclk) {
429 *f_pllout = f_pllout_x4 / 4;
430 return i;
431 }
432 }
433
434 return -EINVAL;
435 }
436
437 /*
438 * Calculate internal frequencies and dividers, according to Figure 40
439 * "PLL and Clock Select Circuit" in WM8978 datasheet Rev. 2.6
440 */
441 static int wm8978_configure_pll(struct snd_soc_codec *codec)
442 {
443 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
444 struct wm8978_pll_div pll_div;
445 unsigned int f_opclk = wm8978->f_opclk, f_mclk = wm8978->f_mclk,
446 f_256fs = wm8978->f_256fs;
447 unsigned int f2;
448
449 if (!f_mclk)
450 return -EINVAL;
451
452 if (f_opclk) {
453 unsigned int opclk_div;
454 /* Cannot set up MCLK divider now, do later */
455 wm8978->mclk_idx = -1;
456
457 /*
458 * The user needs OPCLK. Choose OPCLKDIV to put
459 * 6 <= R = f2 / f1 < 13, 1 <= OPCLKDIV <= 4.
460 * f_opclk = f_mclk * prescale * R / 4 / OPCLKDIV, where
461 * prescale = 1, or prescale = 2. Prescale is calculated inside
462 * pll_factors(). We have to select f_PLLOUT, such that
463 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
464 * f_mclk * 3 / 16 <= f_opclk < f_mclk * 13 / 4.
465 */
466 if (16 * f_opclk < 3 * f_mclk || 4 * f_opclk >= 13 * f_mclk)
467 return -EINVAL;
468
469 if (4 * f_opclk < 3 * f_mclk)
470 /* Have to use OPCLKDIV */
471 opclk_div = (3 * f_mclk / 4 + f_opclk - 1) / f_opclk;
472 else
473 opclk_div = 1;
474
475 dev_dbg(codec->dev, "%s: OPCLKDIV=%d\n", __func__, opclk_div);
476
477 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 0x30,
478 (opclk_div - 1) << 4);
479
480 wm8978->f_pllout = f_opclk * opclk_div;
481 } else if (f_256fs) {
482 /*
483 * Not using OPCLK, but PLL is used for the codec, choose R:
484 * 6 <= R = f2 / f1 < 13, to put 1 <= MCLKDIV <= 12.
485 * f_256fs = f_mclk * prescale * R / 4 / MCLKDIV, where
486 * prescale = 1, or prescale = 2. Prescale is calculated inside
487 * pll_factors(). We have to select f_PLLOUT, such that
488 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
489 * f_mclk * 3 / 48 <= f_256fs < f_mclk * 13 / 4. This means MCLK
490 * must be 3.781MHz <= f_MCLK <= 32.768MHz
491 */
492 int idx = wm8978_enum_mclk(f_256fs, f_mclk, &wm8978->f_pllout);
493 if (idx < 0)
494 return idx;
495
496 wm8978->mclk_idx = idx;
497
498 /* GPIO1 into default mode as input - before configuring PLL */
499 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
500 } else {
501 return -EINVAL;
502 }
503
504 f2 = wm8978->f_pllout * 4;
505
506 dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__,
507 wm8978->f_mclk, wm8978->f_pllout);
508
509 pll_factors(codec, &pll_div, f2, wm8978->f_mclk);
510
511 dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n",
512 __func__, pll_div.n, pll_div.k, pll_div.div2);
513
514 /* Turn PLL off for configuration... */
515 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
516
517 snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n);
518 snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18);
519 snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff);
520 snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff);
521
522 /* ...and on again */
523 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
524
525 if (f_opclk)
526 /* Output PLL (OPCLK) to GPIO1 */
527 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4);
528
529 return 0;
530 }
531
532 /*
533 * Configure WM8978 clock dividers.
534 */
535 static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
536 int div_id, int div)
537 {
538 struct snd_soc_codec *codec = codec_dai->codec;
539 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
540 int ret = 0;
541
542 switch (div_id) {
543 case WM8978_OPCLKRATE:
544 wm8978->f_opclk = div;
545
546 if (wm8978->f_mclk)
547 /*
548 * We know the MCLK frequency, the user has requested
549 * OPCLK, configure the PLL based on that and start it
550 * and OPCLK immediately. We will configure PLL to match
551 * user-requested OPCLK frquency as good as possible.
552 * In fact, it is likely, that matching the sampling
553 * rate, when it becomes known, is more important, and
554 * we will not be reconfiguring PLL then, because we
555 * must not interrupt OPCLK. But it should be fine,
556 * because typically the user will request OPCLK to run
557 * at 256fs or 512fs, and for these cases we will also
558 * find an exact MCLK divider configuration - it will
559 * be equal to or double the OPCLK divisor.
560 */
561 ret = wm8978_configure_pll(codec);
562 break;
563 case WM8978_BCLKDIV:
564 if (div & ~0x1c)
565 return -EINVAL;
566 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div);
567 break;
568 default:
569 return -EINVAL;
570 }
571
572 dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div);
573
574 return ret;
575 }
576
577 /*
578 * @freq: when .set_pll() us not used, freq is codec MCLK input frequency
579 */
580 static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
581 unsigned int freq, int dir)
582 {
583 struct snd_soc_codec *codec = codec_dai->codec;
584 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
585 int ret = 0;
586
587 dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq);
588
589 if (freq) {
590 wm8978->f_mclk = freq;
591
592 /* Even if MCLK is used for system clock, might have to drive OPCLK */
593 if (wm8978->f_opclk)
594 ret = wm8978_configure_pll(codec);
595
596 /* Our sysclk is fixed to 256 * fs, will configure in .hw_params() */
597
598 if (!ret)
599 wm8978->sysclk = clk_id;
600 }
601
602 if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) {
603 /* Clock CODEC directly from MCLK */
604 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
605
606 /* GPIO1 into default mode as input - before configuring PLL */
607 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
608
609 /* Turn off PLL */
610 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
611 wm8978->sysclk = WM8978_MCLK;
612 wm8978->f_pllout = 0;
613 wm8978->f_opclk = 0;
614 }
615
616 return ret;
617 }
618
619 /*
620 * Set ADC and Voice DAC format.
621 */
622 static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
623 {
624 struct snd_soc_codec *codec = codec_dai->codec;
625 /*
626 * BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80,
627 * Data Format mask = 0x18: all will be calculated anew
628 */
629 u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198;
630 u16 clk = snd_soc_read(codec, WM8978_CLOCKING);
631
632 dev_dbg(codec->dev, "%s\n", __func__);
633
634 /* set master/slave audio interface */
635 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
636 case SND_SOC_DAIFMT_CBM_CFM:
637 clk |= 1;
638 break;
639 case SND_SOC_DAIFMT_CBS_CFS:
640 clk &= ~1;
641 break;
642 default:
643 return -EINVAL;
644 }
645
646 /* interface format */
647 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
648 case SND_SOC_DAIFMT_I2S:
649 iface |= 0x10;
650 break;
651 case SND_SOC_DAIFMT_RIGHT_J:
652 break;
653 case SND_SOC_DAIFMT_LEFT_J:
654 iface |= 0x8;
655 break;
656 case SND_SOC_DAIFMT_DSP_A:
657 iface |= 0x18;
658 break;
659 default:
660 return -EINVAL;
661 }
662
663 /* clock inversion */
664 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
665 case SND_SOC_DAIFMT_NB_NF:
666 break;
667 case SND_SOC_DAIFMT_IB_IF:
668 iface |= 0x180;
669 break;
670 case SND_SOC_DAIFMT_IB_NF:
671 iface |= 0x100;
672 break;
673 case SND_SOC_DAIFMT_NB_IF:
674 iface |= 0x80;
675 break;
676 default:
677 return -EINVAL;
678 }
679
680 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface);
681 snd_soc_write(codec, WM8978_CLOCKING, clk);
682
683 return 0;
684 }
685
686 /*
687 * Set PCM DAI bit size and sample rate.
688 */
689 static int wm8978_hw_params(struct snd_pcm_substream *substream,
690 struct snd_pcm_hw_params *params,
691 struct snd_soc_dai *dai)
692 {
693 struct snd_soc_pcm_runtime *rtd = substream->private_data;
694 struct snd_soc_codec *codec = rtd->codec;
695 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
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
813 static 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
827 static 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->dapm.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->dapm.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
869 static 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 */
878 static struct snd_soc_dai_driver wm8978_dai = {
879 .name = "wm8978-hifi",
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 };
896
897 static int wm8978_suspend(struct snd_soc_codec *codec, pm_message_t state)
898 {
899 wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
900 /* Also switch PLL off */
901 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0);
902
903 return 0;
904 }
905
906 static int wm8978_resume(struct snd_soc_codec *codec)
907 {
908 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
909 int i;
910 u16 *cache = codec->reg_cache;
911
912 /* Sync reg_cache with the hardware */
913 for (i = 0; i < ARRAY_SIZE(wm8978_reg); i++) {
914 if (i == WM8978_RESET)
915 continue;
916 if (cache[i] != wm8978_reg[i])
917 snd_soc_write(codec, i, cache[i]);
918 }
919
920 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
921
922 if (wm8978->f_pllout)
923 /* Switch PLL on */
924 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
925
926 return 0;
927 }
928
929 /*
930 * These registers contain an "update" bit - bit 8. This means, for example,
931 * that one can write new DAC digital volume for both channels, but only when
932 * the update bit is set, will also the volume be updated - simultaneously for
933 * both channels.
934 */
935 static const int update_reg[] = {
936 WM8978_LEFT_DAC_DIGITAL_VOLUME,
937 WM8978_RIGHT_DAC_DIGITAL_VOLUME,
938 WM8978_LEFT_ADC_DIGITAL_VOLUME,
939 WM8978_RIGHT_ADC_DIGITAL_VOLUME,
940 WM8978_LEFT_INP_PGA_CONTROL,
941 WM8978_RIGHT_INP_PGA_CONTROL,
942 WM8978_LOUT1_HP_CONTROL,
943 WM8978_ROUT1_HP_CONTROL,
944 WM8978_LOUT2_SPK_CONTROL,
945 WM8978_ROUT2_SPK_CONTROL,
946 };
947
948 static int wm8978_probe(struct snd_soc_codec *codec)
949 {
950 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
951 int ret = 0, i;
952
953 /*
954 * Set default system clock to PLL, it is more precise, this is also the
955 * default hardware setting
956 */
957 wm8978->sysclk = WM8978_PLL;
958 codec->control_data = wm8978->control_data;
959 ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
960 if (ret < 0) {
961 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
962 return ret;
963 }
964
965 /*
966 * Set the update bit in all registers, that have one. This way all
967 * writes to those registers will also cause the update bit to be
968 * written.
969 */
970 for (i = 0; i < ARRAY_SIZE(update_reg); i++)
971 snd_soc_update_bits(codec, update_reg[i], 0x100, 0x100);
972
973 /* Reset the codec */
974 ret = snd_soc_write(codec, WM8978_RESET, 0);
975 if (ret < 0) {
976 dev_err(codec->dev, "Failed to issue reset\n");
977 return ret;
978 }
979
980 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
981
982 snd_soc_add_controls(codec, wm8978_snd_controls,
983 ARRAY_SIZE(wm8978_snd_controls));
984 wm8978_add_widgets(codec);
985
986 return 0;
987 }
988
989 /* power down chip */
990 static int wm8978_remove(struct snd_soc_codec *codec)
991 {
992 wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
993 return 0;
994 }
995
996 static struct snd_soc_codec_driver soc_codec_dev_wm8978 = {
997 .probe = wm8978_probe,
998 .remove = wm8978_remove,
999 .suspend = wm8978_suspend,
1000 .resume = wm8978_resume,
1001 .set_bias_level = wm8978_set_bias_level,
1002 .reg_cache_size = ARRAY_SIZE(wm8978_reg),
1003 .reg_word_size = sizeof(u16),
1004 .reg_cache_default = wm8978_reg,
1005 };
1006
1007 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
1008 static __devinit int wm8978_i2c_probe(struct i2c_client *i2c,
1009 const struct i2c_device_id *id)
1010 {
1011 struct wm8978_priv *wm8978;
1012 int ret;
1013
1014 wm8978 = kzalloc(sizeof(struct wm8978_priv), GFP_KERNEL);
1015 if (wm8978 == NULL)
1016 return -ENOMEM;
1017
1018 i2c_set_clientdata(i2c, wm8978);
1019 wm8978->control_data = i2c;
1020
1021 ret = snd_soc_register_codec(&i2c->dev,
1022 &soc_codec_dev_wm8978, &wm8978_dai, 1);
1023 if (ret < 0)
1024 kfree(wm8978);
1025 return ret;
1026 }
1027
1028 static __devexit int wm8978_i2c_remove(struct i2c_client *client)
1029 {
1030 snd_soc_unregister_codec(&client->dev);
1031 kfree(i2c_get_clientdata(client));
1032 return 0;
1033 }
1034
1035 static const struct i2c_device_id wm8978_i2c_id[] = {
1036 { "wm8978", 0 },
1037 { }
1038 };
1039 MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
1040
1041 static struct i2c_driver wm8978_i2c_driver = {
1042 .driver = {
1043 .name = "wm8978",
1044 .owner = THIS_MODULE,
1045 },
1046 .probe = wm8978_i2c_probe,
1047 .remove = __devexit_p(wm8978_i2c_remove),
1048 .id_table = wm8978_i2c_id,
1049 };
1050 #endif
1051
1052 static int __init wm8978_modinit(void)
1053 {
1054 int ret = 0;
1055 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
1056 ret = i2c_add_driver(&wm8978_i2c_driver);
1057 if (ret != 0) {
1058 printk(KERN_ERR "Failed to register WM8978 I2C driver: %d\n",
1059 ret);
1060 }
1061 #endif
1062 return ret;
1063 }
1064 module_init(wm8978_modinit);
1065
1066 static void __exit wm8978_exit(void)
1067 {
1068 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
1069 i2c_del_driver(&wm8978_i2c_driver);
1070 #endif
1071 }
1072 module_exit(wm8978_exit);
1073
1074 MODULE_DESCRIPTION("ASoC WM8978 codec driver");
1075 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
1076 MODULE_LICENSE("GPL");
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