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mm: compaction: don't depend on HUGETLB_PAGE
[linux/fpc-iii.git] / sound / soc / codecs / wm8978.c
blob4bbc3442703f7ceaf7b20954e45365cf88db04de
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
97 static const struct snd_kcontrol_new wm8978_snd_controls[] = {
98
99 SOC_SINGLE("Digital Loopback Switch",
100 WM8978_COMPANDING_CONTROL, 0, 1, 0),
101
102 SOC_ENUM("ADC Companding", adc_compand),
103 SOC_ENUM("DAC Companding", dac_compand),
104
105 SOC_DOUBLE("DAC Inversion Switch", WM8978_DAC_CONTROL, 0, 1, 1, 0),
106
107 SOC_DOUBLE_R_TLV("PCM Volume",
108 WM8978_LEFT_DAC_DIGITAL_VOLUME, WM8978_RIGHT_DAC_DIGITAL_VOLUME,
109 0, 255, 0, digital_tlv),
110
111 SOC_SINGLE("High Pass Filter Switch", WM8978_ADC_CONTROL, 8, 1, 0),
112 SOC_SINGLE("High Pass Cut Off", WM8978_ADC_CONTROL, 4, 7, 0),
113 SOC_DOUBLE("ADC Inversion Switch", WM8978_ADC_CONTROL, 0, 1, 1, 0),
114
115 SOC_DOUBLE_R_TLV("ADC Volume",
116 WM8978_LEFT_ADC_DIGITAL_VOLUME, WM8978_RIGHT_ADC_DIGITAL_VOLUME,
117 0, 255, 0, digital_tlv),
118
119 SOC_ENUM("Equaliser Function", eqmode),
120 SOC_ENUM("EQ1 Cut Off", eq1),
121 SOC_SINGLE_TLV("EQ1 Volume", WM8978_EQ1, 0, 24, 1, eq_tlv),
122
123 SOC_ENUM("Equaliser EQ2 Bandwith", eq2bw),
124 SOC_ENUM("EQ2 Cut Off", eq2),
125 SOC_SINGLE_TLV("EQ2 Volume", WM8978_EQ2, 0, 24, 1, eq_tlv),
126
127 SOC_ENUM("Equaliser EQ3 Bandwith", eq3bw),
128 SOC_ENUM("EQ3 Cut Off", eq3),
129 SOC_SINGLE_TLV("EQ3 Volume", WM8978_EQ3, 0, 24, 1, eq_tlv),
130
131 SOC_ENUM("Equaliser EQ4 Bandwith", eq4bw),
132 SOC_ENUM("EQ4 Cut Off", eq4),
133 SOC_SINGLE_TLV("EQ4 Volume", WM8978_EQ4, 0, 24, 1, eq_tlv),
134
135 SOC_ENUM("EQ5 Cut Off", eq5),
136 SOC_SINGLE_TLV("EQ5 Volume", WM8978_EQ5, 0, 24, 1, eq_tlv),
137
138 SOC_SINGLE("DAC Playback Limiter Switch",
139 WM8978_DAC_LIMITER_1, 8, 1, 0),
140 SOC_SINGLE("DAC Playback Limiter Decay",
141 WM8978_DAC_LIMITER_1, 4, 15, 0),
142 SOC_SINGLE("DAC Playback Limiter Attack",
143 WM8978_DAC_LIMITER_1, 0, 15, 0),
144
145 SOC_SINGLE("DAC Playback Limiter Threshold",
146 WM8978_DAC_LIMITER_2, 4, 7, 0),
147 SOC_SINGLE("DAC Playback Limiter Boost",
148 WM8978_DAC_LIMITER_2, 0, 15, 0),
149
150 SOC_ENUM("ALC Enable Switch", alc1),
151 SOC_SINGLE("ALC Capture Min Gain", WM8978_ALC_CONTROL_1, 0, 7, 0),
152 SOC_SINGLE("ALC Capture Max Gain", WM8978_ALC_CONTROL_1, 3, 7, 0),
153
154 SOC_SINGLE("ALC Capture Hold", WM8978_ALC_CONTROL_2, 4, 7, 0),
155 SOC_SINGLE("ALC Capture Target", WM8978_ALC_CONTROL_2, 0, 15, 0),
156
157 SOC_ENUM("ALC Capture Mode", alc3),
158 SOC_SINGLE("ALC Capture Decay", WM8978_ALC_CONTROL_3, 4, 15, 0),
159 SOC_SINGLE("ALC Capture Attack", WM8978_ALC_CONTROL_3, 0, 15, 0),
160
161 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8978_NOISE_GATE, 3, 1, 0),
162 SOC_SINGLE("ALC Capture Noise Gate Threshold",
163 WM8978_NOISE_GATE, 0, 7, 0),
164
165 SOC_DOUBLE_R("Capture PGA ZC Switch",
166 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
167 7, 1, 0),
168
169 /* OUT1 - Headphones */
170 SOC_DOUBLE_R("Headphone Playback ZC Switch",
171 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 7, 1, 0),
172
173 SOC_DOUBLE_R_TLV("Headphone Playback Volume",
174 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL,
175 0, 63, 0, spk_tlv),
176
177 /* OUT2 - Speakers */
178 SOC_DOUBLE_R("Speaker Playback ZC Switch",
179 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 7, 1, 0),
180
181 SOC_DOUBLE_R_TLV("Speaker Playback Volume",
182 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL,
183 0, 63, 0, spk_tlv),
184
185 /* OUT3/4 - Line Output */
186 SOC_DOUBLE_R("Line Playback Switch",
187 WM8978_OUT3_MIXER_CONTROL, WM8978_OUT4_MIXER_CONTROL, 6, 1, 1),
188
189 /* Mixer #3: Boost (Input) mixer */
190 SOC_DOUBLE_R("PGA Boost (+20dB)",
191 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
192 8, 1, 0),
193 SOC_DOUBLE_R_TLV("L2/R2 Boost Volume",
194 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
195 4, 7, 0, boost_tlv),
196 SOC_DOUBLE_R_TLV("Aux Boost Volume",
197 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL,
198 0, 7, 0, boost_tlv),
199
200 /* Input PGA volume */
201 SOC_DOUBLE_R_TLV("Input PGA Volume",
202 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL,
203 0, 63, 0, inpga_tlv),
204
205 /* Headphone */
206 SOC_DOUBLE_R("Headphone Switch",
207 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 6, 1, 1),
208
209 /* Speaker */
210 SOC_DOUBLE_R("Speaker Switch",
211 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 6, 1, 1),
212
213 /* DAC / ADC oversampling */
214 SOC_SINGLE("DAC 128x Oversampling Switch", WM8978_DAC_CONTROL, 8, 1, 0),
215 SOC_SINGLE("ADC 128x Oversampling Switch", WM8978_ADC_CONTROL, 8, 1, 0),
216 };
217
218 /* Mixer #1: Output (OUT1, OUT2) Mixer: mix AUX, Input mixer output and DAC */
219 static const struct snd_kcontrol_new wm8978_left_out_mixer[] = {
220 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_LEFT_MIXER_CONTROL, 1, 1, 0),
221 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_LEFT_MIXER_CONTROL, 5, 1, 0),
222 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_LEFT_MIXER_CONTROL, 0, 1, 0),
223 };
224
225 static const struct snd_kcontrol_new wm8978_right_out_mixer[] = {
226 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_RIGHT_MIXER_CONTROL, 1, 1, 0),
227 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 5, 1, 0),
228 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 0, 1, 0),
229 };
230
231 /* OUT3/OUT4 Mixer not implemented */
232
233 /* Mixer #2: Input PGA Mute */
234 static const struct snd_kcontrol_new wm8978_left_input_mixer[] = {
235 SOC_DAPM_SINGLE("L2 Switch", WM8978_INPUT_CONTROL, 2, 1, 0),
236 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 1, 1, 0),
237 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 0, 1, 0),
238 };
239 static const struct snd_kcontrol_new wm8978_right_input_mixer[] = {
240 SOC_DAPM_SINGLE("R2 Switch", WM8978_INPUT_CONTROL, 6, 1, 0),
241 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 5, 1, 0),
242 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 4, 1, 0),
243 };
244
245 static const struct snd_soc_dapm_widget wm8978_dapm_widgets[] = {
246 SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback",
247 WM8978_POWER_MANAGEMENT_3, 0, 0),
248 SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback",
249 WM8978_POWER_MANAGEMENT_3, 1, 0),
250 SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture",
251 WM8978_POWER_MANAGEMENT_2, 0, 0),
252 SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture",
253 WM8978_POWER_MANAGEMENT_2, 1, 0),
254
255 /* Mixer #1: OUT1,2 */
256 SOC_MIXER_ARRAY("Left Output Mixer", WM8978_POWER_MANAGEMENT_3,
257 2, 0, wm8978_left_out_mixer),
258 SOC_MIXER_ARRAY("Right Output Mixer", WM8978_POWER_MANAGEMENT_3,
259 3, 0, wm8978_right_out_mixer),
260
261 SOC_MIXER_ARRAY("Left Input Mixer", WM8978_POWER_MANAGEMENT_2,
262 2, 0, wm8978_left_input_mixer),
263 SOC_MIXER_ARRAY("Right Input Mixer", WM8978_POWER_MANAGEMENT_2,
264 3, 0, wm8978_right_input_mixer),
265
266 SND_SOC_DAPM_PGA("Left Boost Mixer", WM8978_POWER_MANAGEMENT_2,
267 4, 0, NULL, 0),
268 SND_SOC_DAPM_PGA("Right Boost Mixer", WM8978_POWER_MANAGEMENT_2,
269 5, 0, NULL, 0),
270
271 SND_SOC_DAPM_PGA("Left Capture PGA", WM8978_LEFT_INP_PGA_CONTROL,
272 6, 1, NULL, 0),
273 SND_SOC_DAPM_PGA("Right Capture PGA", WM8978_RIGHT_INP_PGA_CONTROL,
274 6, 1, NULL, 0),
275
276 SND_SOC_DAPM_PGA("Left Headphone Out", WM8978_POWER_MANAGEMENT_2,
277 7, 0, NULL, 0),
278 SND_SOC_DAPM_PGA("Right Headphone Out", WM8978_POWER_MANAGEMENT_2,
279 8, 0, NULL, 0),
280
281 SND_SOC_DAPM_PGA("Left Speaker Out", WM8978_POWER_MANAGEMENT_3,
282 6, 0, NULL, 0),
283 SND_SOC_DAPM_PGA("Right Speaker Out", WM8978_POWER_MANAGEMENT_3,
284 5, 0, NULL, 0),
285
286 SND_SOC_DAPM_MIXER("OUT4 VMID", WM8978_POWER_MANAGEMENT_3,
287 8, 0, NULL, 0),
288
289 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8978_POWER_MANAGEMENT_1, 4, 0),
290
291 SND_SOC_DAPM_INPUT("LMICN"),
292 SND_SOC_DAPM_INPUT("LMICP"),
293 SND_SOC_DAPM_INPUT("RMICN"),
294 SND_SOC_DAPM_INPUT("RMICP"),
295 SND_SOC_DAPM_INPUT("LAUX"),
296 SND_SOC_DAPM_INPUT("RAUX"),
297 SND_SOC_DAPM_INPUT("L2"),
298 SND_SOC_DAPM_INPUT("R2"),
299 SND_SOC_DAPM_OUTPUT("LHP"),
300 SND_SOC_DAPM_OUTPUT("RHP"),
301 SND_SOC_DAPM_OUTPUT("LSPK"),
302 SND_SOC_DAPM_OUTPUT("RSPK"),
303 };
304
305 static const struct snd_soc_dapm_route audio_map[] = {
306 /* Output mixer */
307 {"Right Output Mixer", "PCM Playback Switch", "Right DAC"},
308 {"Right Output Mixer", "Aux Playback Switch", "RAUX"},
309 {"Right Output Mixer", "Line Bypass Switch", "Right Boost Mixer"},
310
311 {"Left Output Mixer", "PCM Playback Switch", "Left DAC"},
312 {"Left Output Mixer", "Aux Playback Switch", "LAUX"},
313 {"Left Output Mixer", "Line Bypass Switch", "Left Boost Mixer"},
314
315 /* Outputs */
316 {"Right Headphone Out", NULL, "Right Output Mixer"},
317 {"RHP", NULL, "Right Headphone Out"},
318
319 {"Left Headphone Out", NULL, "Left Output Mixer"},
320 {"LHP", NULL, "Left Headphone Out"},
321
322 {"Right Speaker Out", NULL, "Right Output Mixer"},
323 {"RSPK", NULL, "Right Speaker Out"},
324
325 {"Left Speaker Out", NULL, "Left Output Mixer"},
326 {"LSPK", NULL, "Left Speaker Out"},
327
328 /* Boost Mixer */
329 {"Right ADC", NULL, "Right Boost Mixer"},
330
331 {"Right Boost Mixer", NULL, "RAUX"},
332 {"Right Boost Mixer", NULL, "Right Capture PGA"},
333 {"Right Boost Mixer", NULL, "R2"},
334
335 {"Left ADC", NULL, "Left Boost Mixer"},
336
337 {"Left Boost Mixer", NULL, "LAUX"},
338 {"Left Boost Mixer", NULL, "Left Capture PGA"},
339 {"Left Boost Mixer", NULL, "L2"},
340
341 /* Input PGA */
342 {"Right Capture PGA", NULL, "Right Input Mixer"},
343 {"Left Capture PGA", NULL, "Left Input Mixer"},
344
345 {"Right Input Mixer", "R2 Switch", "R2"},
346 {"Right Input Mixer", "MicN Switch", "RMICN"},
347 {"Right Input Mixer", "MicP Switch", "RMICP"},
348
349 {"Left Input Mixer", "L2 Switch", "L2"},
350 {"Left Input Mixer", "MicN Switch", "LMICN"},
351 {"Left Input Mixer", "MicP Switch", "LMICP"},
352 };
353
354 static int wm8978_add_widgets(struct snd_soc_codec *codec)
355 {
356 struct snd_soc_dapm_context *dapm = &codec->dapm;
357
358 snd_soc_dapm_new_controls(dapm, wm8978_dapm_widgets,
359 ARRAY_SIZE(wm8978_dapm_widgets));
360 /* set up the WM8978 audio map */
361 snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
362
363 return 0;
364 }
365
366 /* PLL divisors */
367 struct wm8978_pll_div {
368 u32 k;
369 u8 n;
370 u8 div2;
371 };
372
373 #define FIXED_PLL_SIZE (1 << 24)
374
375 static void pll_factors(struct snd_soc_codec *codec,
376 struct wm8978_pll_div *pll_div, unsigned int target, unsigned int source)
377 {
378 u64 k_part;
379 unsigned int k, n_div, n_mod;
380
381 n_div = target / source;
382 if (n_div < 6) {
383 source >>= 1;
384 pll_div->div2 = 1;
385 n_div = target / source;
386 } else {
387 pll_div->div2 = 0;
388 }
389
390 if (n_div < 6 || n_div > 12)
391 dev_warn(codec->dev,
392 "WM8978 N value exceeds recommended range! N = %u\n",
393 n_div);
394
395 pll_div->n = n_div;
396 n_mod = target - source * n_div;
397 k_part = FIXED_PLL_SIZE * (long long)n_mod + source / 2;
398
399 do_div(k_part, source);
400
401 k = k_part & 0xFFFFFFFF;
402
403 pll_div->k = k;
404 }
405
406 /* MCLK dividers */
407 static const int mclk_numerator[] = {1, 3, 2, 3, 4, 6, 8, 12};
408 static const int mclk_denominator[] = {1, 2, 1, 1, 1, 1, 1, 1};
409
410 /*
411 * find index >= idx, such that, for a given f_out,
412 * 3 * f_mclk / 4 <= f_PLLOUT < 13 * f_mclk / 4
413 * f_out can be f_256fs or f_opclk, currently only used for f_256fs. Can be
414 * generalised for f_opclk with suitable coefficient arrays, but currently
415 * the OPCLK divisor is calculated directly, not iteratively.
416 */
417 static int wm8978_enum_mclk(unsigned int f_out, unsigned int f_mclk,
418 unsigned int *f_pllout)
419 {
420 int i;
421
422 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
423 unsigned int f_pllout_x4 = 4 * f_out * mclk_numerator[i] /
424 mclk_denominator[i];
425 if (3 * f_mclk <= f_pllout_x4 && f_pllout_x4 < 13 * f_mclk) {
426 *f_pllout = f_pllout_x4 / 4;
427 return i;
428 }
429 }
430
431 return -EINVAL;
432 }
433
434 /*
435 * Calculate internal frequencies and dividers, according to Figure 40
436 * "PLL and Clock Select Circuit" in WM8978 datasheet Rev. 2.6
437 */
438 static int wm8978_configure_pll(struct snd_soc_codec *codec)
439 {
440 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
441 struct wm8978_pll_div pll_div;
442 unsigned int f_opclk = wm8978->f_opclk, f_mclk = wm8978->f_mclk,
443 f_256fs = wm8978->f_256fs;
444 unsigned int f2;
445
446 if (!f_mclk)
447 return -EINVAL;
448
449 if (f_opclk) {
450 unsigned int opclk_div;
451 /* Cannot set up MCLK divider now, do later */
452 wm8978->mclk_idx = -1;
453
454 /*
455 * The user needs OPCLK. Choose OPCLKDIV to put
456 * 6 <= R = f2 / f1 < 13, 1 <= OPCLKDIV <= 4.
457 * f_opclk = f_mclk * prescale * R / 4 / OPCLKDIV, where
458 * prescale = 1, or prescale = 2. Prescale is calculated inside
459 * pll_factors(). We have to select f_PLLOUT, such that
460 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
461 * f_mclk * 3 / 16 <= f_opclk < f_mclk * 13 / 4.
462 */
463 if (16 * f_opclk < 3 * f_mclk || 4 * f_opclk >= 13 * f_mclk)
464 return -EINVAL;
465
466 if (4 * f_opclk < 3 * f_mclk)
467 /* Have to use OPCLKDIV */
468 opclk_div = (3 * f_mclk / 4 + f_opclk - 1) / f_opclk;
469 else
470 opclk_div = 1;
471
472 dev_dbg(codec->dev, "%s: OPCLKDIV=%d\n", __func__, opclk_div);
473
474 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 0x30,
475 (opclk_div - 1) << 4);
476
477 wm8978->f_pllout = f_opclk * opclk_div;
478 } else if (f_256fs) {
479 /*
480 * Not using OPCLK, but PLL is used for the codec, choose R:
481 * 6 <= R = f2 / f1 < 13, to put 1 <= MCLKDIV <= 12.
482 * f_256fs = f_mclk * prescale * R / 4 / MCLKDIV, where
483 * prescale = 1, or prescale = 2. Prescale is calculated inside
484 * pll_factors(). We have to select f_PLLOUT, such that
485 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be
486 * f_mclk * 3 / 48 <= f_256fs < f_mclk * 13 / 4. This means MCLK
487 * must be 3.781MHz <= f_MCLK <= 32.768MHz
488 */
489 int idx = wm8978_enum_mclk(f_256fs, f_mclk, &wm8978->f_pllout);
490 if (idx < 0)
491 return idx;
492
493 wm8978->mclk_idx = idx;
494
495 /* GPIO1 into default mode as input - before configuring PLL */
496 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
497 } else {
498 return -EINVAL;
499 }
500
501 f2 = wm8978->f_pllout * 4;
502
503 dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__,
504 wm8978->f_mclk, wm8978->f_pllout);
505
506 pll_factors(codec, &pll_div, f2, wm8978->f_mclk);
507
508 dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n",
509 __func__, pll_div.n, pll_div.k, pll_div.div2);
510
511 /* Turn PLL off for configuration... */
512 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
513
514 snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n);
515 snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18);
516 snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff);
517 snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff);
518
519 /* ...and on again */
520 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
521
522 if (f_opclk)
523 /* Output PLL (OPCLK) to GPIO1 */
524 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4);
525
526 return 0;
527 }
528
529 /*
530 * Configure WM8978 clock dividers.
531 */
532 static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
533 int div_id, int div)
534 {
535 struct snd_soc_codec *codec = codec_dai->codec;
536 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
537 int ret = 0;
538
539 switch (div_id) {
540 case WM8978_OPCLKRATE:
541 wm8978->f_opclk = div;
542
543 if (wm8978->f_mclk)
544 /*
545 * We know the MCLK frequency, the user has requested
546 * OPCLK, configure the PLL based on that and start it
547 * and OPCLK immediately. We will configure PLL to match
548 * user-requested OPCLK frquency as good as possible.
549 * In fact, it is likely, that matching the sampling
550 * rate, when it becomes known, is more important, and
551 * we will not be reconfiguring PLL then, because we
552 * must not interrupt OPCLK. But it should be fine,
553 * because typically the user will request OPCLK to run
554 * at 256fs or 512fs, and for these cases we will also
555 * find an exact MCLK divider configuration - it will
556 * be equal to or double the OPCLK divisor.
557 */
558 ret = wm8978_configure_pll(codec);
559 break;
560 case WM8978_BCLKDIV:
561 if (div & ~0x1c)
562 return -EINVAL;
563 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div);
564 break;
565 default:
566 return -EINVAL;
567 }
568
569 dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div);
570
571 return ret;
572 }
573
574 /*
575 * @freq: when .set_pll() us not used, freq is codec MCLK input frequency
576 */
577 static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
578 unsigned int freq, int dir)
579 {
580 struct snd_soc_codec *codec = codec_dai->codec;
581 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
582 int ret = 0;
583
584 dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq);
585
586 if (freq) {
587 wm8978->f_mclk = freq;
588
589 /* Even if MCLK is used for system clock, might have to drive OPCLK */
590 if (wm8978->f_opclk)
591 ret = wm8978_configure_pll(codec);
592
593 /* Our sysclk is fixed to 256 * fs, will configure in .hw_params() */
594
595 if (!ret)
596 wm8978->sysclk = clk_id;
597 }
598
599 if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) {
600 /* Clock CODEC directly from MCLK */
601 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
602
603 /* GPIO1 into default mode as input - before configuring PLL */
604 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
605
606 /* Turn off PLL */
607 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
608 wm8978->sysclk = WM8978_MCLK;
609 wm8978->f_pllout = 0;
610 wm8978->f_opclk = 0;
611 }
612
613 return ret;
614 }
615
616 /*
617 * Set ADC and Voice DAC format.
618 */
619 static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
620 {
621 struct snd_soc_codec *codec = codec_dai->codec;
622 /*
623 * BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80,
624 * Data Format mask = 0x18: all will be calculated anew
625 */
626 u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198;
627 u16 clk = snd_soc_read(codec, WM8978_CLOCKING);
628
629 dev_dbg(codec->dev, "%s\n", __func__);
630
631 /* set master/slave audio interface */
632 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
633 case SND_SOC_DAIFMT_CBM_CFM:
634 clk |= 1;
635 break;
636 case SND_SOC_DAIFMT_CBS_CFS:
637 clk &= ~1;
638 break;
639 default:
640 return -EINVAL;
641 }
642
643 /* interface format */
644 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
645 case SND_SOC_DAIFMT_I2S:
646 iface |= 0x10;
647 break;
648 case SND_SOC_DAIFMT_RIGHT_J:
649 break;
650 case SND_SOC_DAIFMT_LEFT_J:
651 iface |= 0x8;
652 break;
653 case SND_SOC_DAIFMT_DSP_A:
654 iface |= 0x18;
655 break;
656 default:
657 return -EINVAL;
658 }
659
660 /* clock inversion */
661 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
662 case SND_SOC_DAIFMT_NB_NF:
663 break;
664 case SND_SOC_DAIFMT_IB_IF:
665 iface |= 0x180;
666 break;
667 case SND_SOC_DAIFMT_IB_NF:
668 iface |= 0x100;
669 break;
670 case SND_SOC_DAIFMT_NB_IF:
671 iface |= 0x80;
672 break;
673 default:
674 return -EINVAL;
675 }
676
677 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface);
678 snd_soc_write(codec, WM8978_CLOCKING, clk);
679
680 return 0;
681 }
682
683 /*
684 * Set PCM DAI bit size and sample rate.
685 */
686 static int wm8978_hw_params(struct snd_pcm_substream *substream,
687 struct snd_pcm_hw_params *params,
688 struct snd_soc_dai *dai)
689 {
690 struct snd_soc_pcm_runtime *rtd = substream->private_data;
691 struct snd_soc_codec *codec = rtd->codec;
692 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
693 /* Word length mask = 0x60 */
694 u16 iface_ctl = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x60;
695 /* Sampling rate mask = 0xe (for filters) */
696 u16 add_ctl = snd_soc_read(codec, WM8978_ADDITIONAL_CONTROL) & ~0xe;
697 u16 clking = snd_soc_read(codec, WM8978_CLOCKING);
698 enum wm8978_sysclk_src current_clk_id = clking & 0x100 ?
699 WM8978_PLL : WM8978_MCLK;
700 unsigned int f_sel, diff, diff_best = INT_MAX;
701 int i, best = 0;
702
703 if (!wm8978->f_mclk)
704 return -EINVAL;
705
706 /* bit size */
707 switch (params_format(params)) {
708 case SNDRV_PCM_FORMAT_S16_LE:
709 break;
710 case SNDRV_PCM_FORMAT_S20_3LE:
711 iface_ctl |= 0x20;
712 break;
713 case SNDRV_PCM_FORMAT_S24_LE:
714 iface_ctl |= 0x40;
715 break;
716 case SNDRV_PCM_FORMAT_S32_LE:
717 iface_ctl |= 0x60;
718 break;
719 }
720
721 /* filter coefficient */
722 switch (params_rate(params)) {
723 case 8000:
724 add_ctl |= 0x5 << 1;
725 break;
726 case 11025:
727 add_ctl |= 0x4 << 1;
728 break;
729 case 16000:
730 add_ctl |= 0x3 << 1;
731 break;
732 case 22050:
733 add_ctl |= 0x2 << 1;
734 break;
735 case 32000:
736 add_ctl |= 0x1 << 1;
737 break;
738 case 44100:
739 case 48000:
740 break;
741 }
742
743 /* Sampling rate is known now, can configure the MCLK divider */
744 wm8978->f_256fs = params_rate(params) * 256;
745
746 if (wm8978->sysclk == WM8978_MCLK) {
747 wm8978->mclk_idx = -1;
748 f_sel = wm8978->f_mclk;
749 } else {
750 if (!wm8978->f_pllout) {
751 /* We only enter here, if OPCLK is not used */
752 int ret = wm8978_configure_pll(codec);
753 if (ret < 0)
754 return ret;
755 }
756 f_sel = wm8978->f_pllout;
757 }
758
759 if (wm8978->mclk_idx < 0) {
760 /* Either MCLK is used directly, or OPCLK is used */
761 if (f_sel < wm8978->f_256fs || f_sel > 12 * wm8978->f_256fs)
762 return -EINVAL;
763
764 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
765 diff = abs(wm8978->f_256fs * 3 -
766 f_sel * 3 * mclk_denominator[i] / mclk_numerator[i]);
767
768 if (diff < diff_best) {
769 diff_best = diff;
770 best = i;
771 }
772
773 if (!diff)
774 break;
775 }
776 } else {
777 /* OPCLK not used, codec driven by PLL */
778 best = wm8978->mclk_idx;
779 diff = 0;
780 }
781
782 if (diff)
783 dev_warn(codec->dev, "Imprecise sampling rate: %uHz%s\n",
784 f_sel * mclk_denominator[best] / mclk_numerator[best] / 256,
785 wm8978->sysclk == WM8978_MCLK ?
786 ", consider using PLL" : "");
787
788 dev_dbg(codec->dev, "%s: fmt %d, rate %u, MCLK divisor #%d\n", __func__,
789 params_format(params), params_rate(params), best);
790
791 /* MCLK divisor mask = 0xe0 */
792 snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, best << 5);
793
794 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface_ctl);
795 snd_soc_write(codec, WM8978_ADDITIONAL_CONTROL, add_ctl);
796
797 if (wm8978->sysclk != current_clk_id) {
798 if (wm8978->sysclk == WM8978_PLL)
799 /* Run CODEC from PLL instead of MCLK */
800 snd_soc_update_bits(codec, WM8978_CLOCKING,
801 0x100, 0x100);
802 else
803 /* Clock CODEC directly from MCLK */
804 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
805 }
806
807 return 0;
808 }
809
810 static int wm8978_mute(struct snd_soc_dai *dai, int mute)
811 {
812 struct snd_soc_codec *codec = dai->codec;
813
814 dev_dbg(codec->dev, "%s: %d\n", __func__, mute);
815
816 if (mute)
817 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0x40);
818 else
819 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0);
820
821 return 0;
822 }
823
824 static int wm8978_set_bias_level(struct snd_soc_codec *codec,
825 enum snd_soc_bias_level level)
826 {
827 u16 power1 = snd_soc_read(codec, WM8978_POWER_MANAGEMENT_1) & ~3;
828
829 switch (level) {
830 case SND_SOC_BIAS_ON:
831 case SND_SOC_BIAS_PREPARE:
832 power1 |= 1; /* VMID 75k */
833 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
834 break;
835 case SND_SOC_BIAS_STANDBY:
836 /* bit 3: enable bias, bit 2: enable I/O tie off buffer */
837 power1 |= 0xc;
838
839 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
840 /* Initial cap charge at VMID 5k */
841 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1,
842 power1 | 0x3);
843 mdelay(100);
844 }
845
846 power1 |= 0x2; /* VMID 500k */
847 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
848 break;
849 case SND_SOC_BIAS_OFF:
850 /* Preserve PLL - OPCLK may be used by someone */
851 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, ~0x20, 0);
852 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0);
853 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_3, 0);
854 break;
855 }
856
857 dev_dbg(codec->dev, "%s: %d, %x\n", __func__, level, power1);
858
859 codec->dapm.bias_level = level;
860 return 0;
861 }
862
863 #define WM8978_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
864 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
865
866 static struct snd_soc_dai_ops wm8978_dai_ops = {
867 .hw_params = wm8978_hw_params,
868 .digital_mute = wm8978_mute,
869 .set_fmt = wm8978_set_dai_fmt,
870 .set_clkdiv = wm8978_set_dai_clkdiv,
871 .set_sysclk = wm8978_set_dai_sysclk,
872 };
873
874 /* Also supports 12kHz */
875 static struct snd_soc_dai_driver wm8978_dai = {
876 .name = "wm8978-hifi",
877 .playback = {
878 .stream_name = "Playback",
879 .channels_min = 1,
880 .channels_max = 2,
881 .rates = SNDRV_PCM_RATE_8000_48000,
882 .formats = WM8978_FORMATS,
883 },
884 .capture = {
885 .stream_name = "Capture",
886 .channels_min = 1,
887 .channels_max = 2,
888 .rates = SNDRV_PCM_RATE_8000_48000,
889 .formats = WM8978_FORMATS,
890 },
891 .ops = &wm8978_dai_ops,
892 };
893
894 static int wm8978_suspend(struct snd_soc_codec *codec, pm_message_t state)
895 {
896 wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
897 /* Also switch PLL off */
898 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0);
899
900 return 0;
901 }
902
903 static int wm8978_resume(struct snd_soc_codec *codec)
904 {
905 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
906 int i;
907 u16 *cache = codec->reg_cache;
908
909 /* Sync reg_cache with the hardware */
910 for (i = 0; i < ARRAY_SIZE(wm8978_reg); i++) {
911 if (i == WM8978_RESET)
912 continue;
913 if (cache[i] != wm8978_reg[i])
914 snd_soc_write(codec, i, cache[i]);
915 }
916
917 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
918
919 if (wm8978->f_pllout)
920 /* Switch PLL on */
921 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
922
923 return 0;
924 }
925
926 /*
927 * These registers contain an "update" bit - bit 8. This means, for example,
928 * that one can write new DAC digital volume for both channels, but only when
929 * the update bit is set, will also the volume be updated - simultaneously for
930 * both channels.
931 */
932 static const int update_reg[] = {
933 WM8978_LEFT_DAC_DIGITAL_VOLUME,
934 WM8978_RIGHT_DAC_DIGITAL_VOLUME,
935 WM8978_LEFT_ADC_DIGITAL_VOLUME,
936 WM8978_RIGHT_ADC_DIGITAL_VOLUME,
937 WM8978_LEFT_INP_PGA_CONTROL,
938 WM8978_RIGHT_INP_PGA_CONTROL,
939 WM8978_LOUT1_HP_CONTROL,
940 WM8978_ROUT1_HP_CONTROL,
941 WM8978_LOUT2_SPK_CONTROL,
942 WM8978_ROUT2_SPK_CONTROL,
943 };
944
945 static int wm8978_probe(struct snd_soc_codec *codec)
946 {
947 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
948 int ret = 0, i;
949
950 /*
951 * Set default system clock to PLL, it is more precise, this is also the
952 * default hardware setting
953 */
954 wm8978->sysclk = WM8978_PLL;
955 codec->control_data = wm8978->control_data;
956 ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C);
957 if (ret < 0) {
958 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
959 return ret;
960 }
961
962 /*
963 * Set the update bit in all registers, that have one. This way all
964 * writes to those registers will also cause the update bit to be
965 * written.
966 */
967 for (i = 0; i < ARRAY_SIZE(update_reg); i++)
968 ((u16 *)codec->reg_cache)[update_reg[i]] |= 0x100;
969
970 /* Reset the codec */
971 ret = snd_soc_write(codec, WM8978_RESET, 0);
972 if (ret < 0) {
973 dev_err(codec->dev, "Failed to issue reset\n");
974 return ret;
975 }
976
977 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
978
979 snd_soc_add_controls(codec, wm8978_snd_controls,
980 ARRAY_SIZE(wm8978_snd_controls));
981 wm8978_add_widgets(codec);
982
983 return 0;
984 }
985
986 /* power down chip */
987 static int wm8978_remove(struct snd_soc_codec *codec)
988 {
989 wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
990 return 0;
991 }
992
993 static struct snd_soc_codec_driver soc_codec_dev_wm8978 = {
994 .probe = wm8978_probe,
995 .remove = wm8978_remove,
996 .suspend = wm8978_suspend,
997 .resume = wm8978_resume,
998 .set_bias_level = wm8978_set_bias_level,
999 .reg_cache_size = ARRAY_SIZE(wm8978_reg),
1000 .reg_word_size = sizeof(u16),
1001 .reg_cache_default = wm8978_reg,
1002 };
1003
1004 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
1005 static __devinit int wm8978_i2c_probe(struct i2c_client *i2c,
1006 const struct i2c_device_id *id)
1007 {
1008 struct wm8978_priv *wm8978;
1009 int ret;
1010
1011 wm8978 = kzalloc(sizeof(struct wm8978_priv), GFP_KERNEL);
1012 if (wm8978 == NULL)
1013 return -ENOMEM;
1014
1015 i2c_set_clientdata(i2c, wm8978);
1016 wm8978->control_data = i2c;
1017
1018 ret = snd_soc_register_codec(&i2c->dev,
1019 &soc_codec_dev_wm8978, &wm8978_dai, 1);
1020 if (ret < 0)
1021 kfree(wm8978);
1022 return ret;
1023 }
1024
1025 static __devexit int wm8978_i2c_remove(struct i2c_client *client)
1026 {
1027 snd_soc_unregister_codec(&client->dev);
1028 kfree(i2c_get_clientdata(client));
1029 return 0;
1030 }
1031
1032 static const struct i2c_device_id wm8978_i2c_id[] = {
1033 { "wm8978", 0 },
1034 { }
1035 };
1036 MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
1037
1038 static struct i2c_driver wm8978_i2c_driver = {
1039 .driver = {
1040 .name = "wm8978",
1041 .owner = THIS_MODULE,
1042 },
1043 .probe = wm8978_i2c_probe,
1044 .remove = __devexit_p(wm8978_i2c_remove),
1045 .id_table = wm8978_i2c_id,
1046 };
1047 #endif
1048
1049 static int __init wm8978_modinit(void)
1050 {
1051 int ret = 0;
1052 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
1053 ret = i2c_add_driver(&wm8978_i2c_driver);
1054 if (ret != 0) {
1055 printk(KERN_ERR "Failed to register WM8978 I2C driver: %d\n",
1056 ret);
1057 }
1058 #endif
1059 return ret;
1060 }
1061 module_init(wm8978_modinit);
1062
1063 static void __exit wm8978_exit(void)
1064 {
1065 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
1066 i2c_del_driver(&wm8978_i2c_driver);
1067 #endif
1068 }
1069 module_exit(wm8978_exit);
1070
1071 MODULE_DESCRIPTION("ASoC WM8978 codec driver");
1072 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
1073 MODULE_LICENSE("GPL");
Linux with added FPC-III support