Commit | Line | Data |
---|---|---|
992bee40 IL |
1 | /* |
2 | * wm8741.c -- WM8741 ALSA SoC Audio driver | |
3 | * | |
4 | * Copyright 2010 Wolfson Microelectronics plc | |
5 | * | |
6 | * Author: Ian Lartey <ian@opensource.wolfsonmicro.com> | |
7 | * | |
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/init.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/pm.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/regulator/consumer.h> | |
22 | #include <linux/slab.h> | |
23 | #include <sound/core.h> | |
24 | #include <sound/pcm.h> | |
25 | #include <sound/pcm_params.h> | |
26 | #include <sound/soc.h> | |
27 | #include <sound/soc-dapm.h> | |
28 | #include <sound/initval.h> | |
29 | #include <sound/tlv.h> | |
30 | ||
31 | #include "wm8741.h" | |
32 | ||
33 | static struct snd_soc_codec *wm8741_codec; | |
34 | struct snd_soc_codec_device soc_codec_dev_wm8741; | |
35 | ||
36 | #define WM8741_NUM_SUPPLIES 2 | |
37 | static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = { | |
38 | "AVDD", | |
39 | "DVDD", | |
40 | }; | |
41 | ||
42 | #define WM8741_NUM_RATES 4 | |
43 | ||
44 | /* codec private data */ | |
45 | struct wm8741_priv { | |
46 | struct snd_soc_codec codec; | |
47 | u16 reg_cache[WM8741_REGISTER_COUNT]; | |
48 | struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES]; | |
49 | unsigned int sysclk; | |
50 | unsigned int rate_constraint_list[WM8741_NUM_RATES]; | |
51 | struct snd_pcm_hw_constraint_list rate_constraint; | |
52 | }; | |
53 | ||
54 | static const u16 wm8741_reg_defaults[WM8741_REGISTER_COUNT] = { | |
55 | 0x0000, /* R0 - DACLLSB Attenuation */ | |
56 | 0x0000, /* R1 - DACLMSB Attenuation */ | |
57 | 0x0000, /* R2 - DACRLSB Attenuation */ | |
58 | 0x0000, /* R3 - DACRMSB Attenuation */ | |
59 | 0x0000, /* R4 - Volume Control */ | |
60 | 0x000A, /* R5 - Format Control */ | |
61 | 0x0000, /* R6 - Filter Control */ | |
62 | 0x0000, /* R7 - Mode Control 1 */ | |
63 | 0x0002, /* R8 - Mode Control 2 */ | |
64 | 0x0000, /* R9 - Reset */ | |
65 | 0x0002, /* R32 - ADDITONAL_CONTROL_1 */ | |
66 | }; | |
67 | ||
68 | ||
69 | static int wm8741_reset(struct snd_soc_codec *codec) | |
70 | { | |
71 | return snd_soc_write(codec, WM8741_RESET, 0); | |
72 | } | |
73 | ||
74 | static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0); | |
75 | static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0); | |
76 | ||
77 | static const struct snd_kcontrol_new wm8741_snd_controls[] = { | |
78 | SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION, | |
79 | WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine), | |
80 | SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION, | |
81 | WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv), | |
82 | }; | |
83 | ||
84 | static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = { | |
85 | SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0), | |
86 | SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0), | |
87 | SND_SOC_DAPM_OUTPUT("VOUTLP"), | |
88 | SND_SOC_DAPM_OUTPUT("VOUTLN"), | |
89 | SND_SOC_DAPM_OUTPUT("VOUTRP"), | |
90 | SND_SOC_DAPM_OUTPUT("VOUTRN"), | |
91 | }; | |
92 | ||
93 | static const struct snd_soc_dapm_route intercon[] = { | |
94 | { "VOUTLP", NULL, "DACL" }, | |
95 | { "VOUTLN", NULL, "DACL" }, | |
96 | { "VOUTRP", NULL, "DACR" }, | |
97 | { "VOUTRN", NULL, "DACR" }, | |
98 | }; | |
99 | ||
100 | static int wm8741_add_widgets(struct snd_soc_codec *codec) | |
101 | { | |
102 | snd_soc_dapm_new_controls(codec, wm8741_dapm_widgets, | |
103 | ARRAY_SIZE(wm8741_dapm_widgets)); | |
104 | ||
105 | snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static struct { | |
111 | int value; | |
112 | int ratio; | |
113 | } lrclk_ratios[WM8741_NUM_RATES] = { | |
114 | { 1, 256 }, | |
115 | { 2, 384 }, | |
116 | { 3, 512 }, | |
117 | { 4, 768 }, | |
118 | }; | |
119 | ||
120 | ||
121 | static int wm8741_startup(struct snd_pcm_substream *substream, | |
122 | struct snd_soc_dai *dai) | |
123 | { | |
124 | struct snd_soc_codec *codec = dai->codec; | |
125 | struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec); | |
126 | ||
127 | /* The set of sample rates that can be supported depends on the | |
128 | * MCLK supplied to the CODEC - enforce this. | |
129 | */ | |
130 | if (!wm8741->sysclk) { | |
131 | dev_err(codec->dev, | |
132 | "No MCLK configured, call set_sysclk() on init\n"); | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | snd_pcm_hw_constraint_list(substream->runtime, 0, | |
137 | SNDRV_PCM_HW_PARAM_RATE, | |
138 | &wm8741->rate_constraint); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int wm8741_hw_params(struct snd_pcm_substream *substream, | |
144 | struct snd_pcm_hw_params *params, | |
145 | struct snd_soc_dai *dai) | |
146 | { | |
147 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
148 | struct snd_soc_device *socdev = rtd->socdev; | |
149 | struct snd_soc_codec *codec = socdev->card->codec; | |
150 | struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec); | |
151 | u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC; | |
152 | int i; | |
153 | ||
154 | /* Find a supported LRCLK ratio */ | |
155 | for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { | |
156 | if (wm8741->sysclk / params_rate(params) == | |
157 | lrclk_ratios[i].ratio) | |
158 | break; | |
159 | } | |
160 | ||
161 | /* Should never happen, should be handled by constraints */ | |
162 | if (i == ARRAY_SIZE(lrclk_ratios)) { | |
163 | dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n", | |
164 | wm8741->sysclk / params_rate(params)); | |
165 | return -EINVAL; | |
166 | } | |
167 | ||
168 | /* bit size */ | |
169 | switch (params_format(params)) { | |
170 | case SNDRV_PCM_FORMAT_S16_LE: | |
171 | break; | |
172 | case SNDRV_PCM_FORMAT_S20_3LE: | |
173 | iface |= 0x0001; | |
174 | break; | |
175 | case SNDRV_PCM_FORMAT_S24_LE: | |
176 | iface |= 0x0002; | |
177 | break; | |
178 | case SNDRV_PCM_FORMAT_S32_LE: | |
179 | iface |= 0x0003; | |
180 | break; | |
181 | default: | |
182 | dev_dbg(codec->dev, "wm8741_hw_params: Unsupported bit size param = %d", | |
183 | params_format(params)); | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | dev_dbg(codec->dev, "wm8741_hw_params: bit size param = %d", | |
188 | params_format(params)); | |
189 | ||
190 | snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int wm8741_set_dai_sysclk(struct snd_soc_dai *codec_dai, | |
195 | int clk_id, unsigned int freq, int dir) | |
196 | { | |
197 | struct snd_soc_codec *codec = codec_dai->codec; | |
198 | struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec); | |
199 | unsigned int val; | |
200 | int i; | |
201 | ||
202 | dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq); | |
203 | ||
204 | wm8741->sysclk = freq; | |
205 | ||
206 | wm8741->rate_constraint.count = 0; | |
207 | ||
208 | for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { | |
209 | dev_dbg(codec->dev, "index = %d, ratio = %d, freq = %d", | |
210 | i, lrclk_ratios[i].ratio, freq); | |
211 | ||
212 | val = freq / lrclk_ratios[i].ratio; | |
213 | /* Check that it's a standard rate since core can't | |
214 | * cope with others and having the odd rates confuses | |
215 | * constraint matching. | |
216 | */ | |
217 | switch (val) { | |
218 | case 32000: | |
219 | case 44100: | |
220 | case 48000: | |
221 | case 64000: | |
222 | case 88200: | |
223 | case 96000: | |
224 | dev_dbg(codec->dev, "Supported sample rate: %dHz\n", | |
225 | val); | |
226 | wm8741->rate_constraint_list[i] = val; | |
227 | wm8741->rate_constraint.count++; | |
228 | break; | |
229 | default: | |
230 | dev_dbg(codec->dev, "Skipping sample rate: %dHz\n", | |
231 | val); | |
232 | } | |
233 | } | |
234 | ||
235 | /* Need at least one supported rate... */ | |
236 | if (wm8741->rate_constraint.count == 0) | |
237 | return -EINVAL; | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int wm8741_set_dai_fmt(struct snd_soc_dai *codec_dai, | |
243 | unsigned int fmt) | |
244 | { | |
245 | struct snd_soc_codec *codec = codec_dai->codec; | |
246 | u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1C3; | |
247 | ||
248 | /* check master/slave audio interface */ | |
249 | switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { | |
250 | case SND_SOC_DAIFMT_CBS_CFS: | |
251 | break; | |
252 | default: | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | /* interface format */ | |
257 | switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
258 | case SND_SOC_DAIFMT_I2S: | |
259 | iface |= 0x0008; | |
260 | break; | |
261 | case SND_SOC_DAIFMT_RIGHT_J: | |
262 | break; | |
263 | case SND_SOC_DAIFMT_LEFT_J: | |
264 | iface |= 0x0004; | |
265 | break; | |
266 | case SND_SOC_DAIFMT_DSP_A: | |
267 | iface |= 0x0003; | |
268 | break; | |
269 | case SND_SOC_DAIFMT_DSP_B: | |
270 | iface |= 0x0013; | |
271 | break; | |
272 | default: | |
273 | return -EINVAL; | |
274 | } | |
275 | ||
276 | /* clock inversion */ | |
277 | switch (fmt & SND_SOC_DAIFMT_INV_MASK) { | |
278 | case SND_SOC_DAIFMT_NB_NF: | |
279 | break; | |
280 | case SND_SOC_DAIFMT_IB_IF: | |
281 | iface |= 0x0010; | |
282 | break; | |
283 | case SND_SOC_DAIFMT_IB_NF: | |
284 | iface |= 0x0020; | |
285 | break; | |
286 | case SND_SOC_DAIFMT_NB_IF: | |
287 | iface |= 0x0030; | |
288 | break; | |
289 | default: | |
290 | return -EINVAL; | |
291 | } | |
292 | ||
293 | ||
294 | dev_dbg(codec->dev, "wm8741_set_dai_fmt: Format=%x, Clock Inv=%x\n", | |
295 | fmt & SND_SOC_DAIFMT_FORMAT_MASK, | |
296 | ((fmt & SND_SOC_DAIFMT_INV_MASK))); | |
297 | ||
298 | snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | #define WM8741_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ | |
303 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \ | |
304 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \ | |
305 | SNDRV_PCM_RATE_192000) | |
306 | ||
307 | #define WM8741_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ | |
308 | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE) | |
309 | ||
310 | static struct snd_soc_dai_ops wm8741_dai_ops = { | |
311 | .startup = wm8741_startup, | |
312 | .hw_params = wm8741_hw_params, | |
313 | .set_sysclk = wm8741_set_dai_sysclk, | |
314 | .set_fmt = wm8741_set_dai_fmt, | |
315 | }; | |
316 | ||
317 | struct snd_soc_dai wm8741_dai = { | |
318 | .name = "WM8741", | |
319 | .playback = { | |
320 | .stream_name = "Playback", | |
321 | .channels_min = 2, /* Mono modes not yet supported */ | |
322 | .channels_max = 2, | |
323 | .rates = WM8741_RATES, | |
324 | .formats = WM8741_FORMATS, | |
325 | }, | |
326 | .ops = &wm8741_dai_ops, | |
327 | }; | |
328 | EXPORT_SYMBOL_GPL(wm8741_dai); | |
329 | ||
330 | #ifdef CONFIG_PM | |
331 | static int wm8741_resume(struct platform_device *pdev) | |
332 | { | |
333 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
334 | struct snd_soc_codec *codec = socdev->card->codec; | |
335 | u16 *cache = codec->reg_cache; | |
336 | int i; | |
337 | ||
338 | /* RESTORE REG Cache */ | |
339 | for (i = 0; i < WM8741_REGISTER_COUNT; i++) { | |
340 | if (cache[i] == wm8741_reg_defaults[i] || WM8741_RESET == i) | |
341 | continue; | |
342 | snd_soc_write(codec, i, cache[i]); | |
343 | } | |
344 | return 0; | |
345 | } | |
346 | #else | |
347 | #define wm8741_suspend NULL | |
348 | #define wm8741_resume NULL | |
349 | #endif | |
350 | ||
351 | static int wm8741_probe(struct platform_device *pdev) | |
352 | { | |
353 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
354 | struct snd_soc_codec *codec; | |
355 | int ret = 0; | |
356 | ||
357 | if (wm8741_codec == NULL) { | |
358 | dev_err(&pdev->dev, "Codec device not registered\n"); | |
359 | return -ENODEV; | |
360 | } | |
361 | ||
362 | socdev->card->codec = wm8741_codec; | |
363 | codec = wm8741_codec; | |
364 | ||
365 | /* register pcms */ | |
366 | ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); | |
367 | if (ret < 0) { | |
368 | dev_err(codec->dev, "failed to create pcms: %d\n", ret); | |
369 | goto pcm_err; | |
370 | } | |
371 | ||
372 | snd_soc_add_controls(codec, wm8741_snd_controls, | |
373 | ARRAY_SIZE(wm8741_snd_controls)); | |
374 | wm8741_add_widgets(codec); | |
375 | ||
376 | return ret; | |
377 | ||
378 | pcm_err: | |
379 | return ret; | |
380 | } | |
381 | ||
382 | static int wm8741_remove(struct platform_device *pdev) | |
383 | { | |
384 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
385 | ||
386 | snd_soc_free_pcms(socdev); | |
387 | snd_soc_dapm_free(socdev); | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | struct snd_soc_codec_device soc_codec_dev_wm8741 = { | |
393 | .probe = wm8741_probe, | |
394 | .remove = wm8741_remove, | |
395 | .resume = wm8741_resume, | |
396 | }; | |
397 | EXPORT_SYMBOL_GPL(soc_codec_dev_wm8741); | |
398 | ||
399 | static int wm8741_register(struct wm8741_priv *wm8741, | |
400 | enum snd_soc_control_type control) | |
401 | { | |
402 | int ret; | |
403 | struct snd_soc_codec *codec = &wm8741->codec; | |
404 | int i; | |
405 | ||
406 | if (wm8741_codec) { | |
407 | dev_err(codec->dev, "Another WM8741 is registered\n"); | |
408 | return -EINVAL; | |
409 | } | |
410 | ||
411 | mutex_init(&codec->mutex); | |
412 | INIT_LIST_HEAD(&codec->dapm_widgets); | |
413 | INIT_LIST_HEAD(&codec->dapm_paths); | |
414 | ||
415 | snd_soc_codec_set_drvdata(codec, wm8741); | |
416 | codec->name = "WM8741"; | |
417 | codec->owner = THIS_MODULE; | |
418 | codec->bias_level = SND_SOC_BIAS_OFF; | |
419 | codec->set_bias_level = NULL; | |
420 | codec->dai = &wm8741_dai; | |
421 | codec->num_dai = 1; | |
422 | codec->reg_cache_size = WM8741_REGISTER_COUNT; | |
423 | codec->reg_cache = &wm8741->reg_cache; | |
424 | ||
425 | wm8741->rate_constraint.list = &wm8741->rate_constraint_list[0]; | |
426 | wm8741->rate_constraint.count = | |
427 | ARRAY_SIZE(wm8741->rate_constraint_list); | |
428 | ||
429 | memcpy(codec->reg_cache, wm8741_reg_defaults, | |
430 | sizeof(wm8741->reg_cache)); | |
431 | ||
432 | ret = snd_soc_codec_set_cache_io(codec, 7, 9, control); | |
433 | if (ret != 0) { | |
434 | dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret); | |
435 | goto err; | |
436 | } | |
437 | ||
438 | for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++) | |
439 | wm8741->supplies[i].supply = wm8741_supply_names[i]; | |
440 | ||
441 | ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8741->supplies), | |
442 | wm8741->supplies); | |
443 | if (ret != 0) { | |
444 | dev_err(codec->dev, "Failed to request supplies: %d\n", ret); | |
445 | goto err; | |
446 | } | |
447 | ||
448 | ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies), | |
449 | wm8741->supplies); | |
450 | if (ret != 0) { | |
451 | dev_err(codec->dev, "Failed to enable supplies: %d\n", ret); | |
452 | goto err_get; | |
453 | } | |
454 | ||
455 | ret = wm8741_reset(codec); | |
456 | if (ret < 0) { | |
457 | dev_err(codec->dev, "Failed to issue reset\n"); | |
458 | goto err_enable; | |
459 | } | |
460 | ||
461 | wm8741_dai.dev = codec->dev; | |
462 | ||
463 | /* Change some default settings - latch VU */ | |
464 | wm8741->reg_cache[WM8741_DACLLSB_ATTENUATION] |= WM8741_UPDATELL; | |
465 | wm8741->reg_cache[WM8741_DACLMSB_ATTENUATION] |= WM8741_UPDATELM; | |
466 | wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERL; | |
467 | wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERM; | |
468 | ||
469 | wm8741_codec = codec; | |
470 | ||
471 | ret = snd_soc_register_codec(codec); | |
472 | if (ret != 0) { | |
473 | dev_err(codec->dev, "Failed to register codec: %d\n", ret); | |
474 | return ret; | |
475 | } | |
476 | ||
477 | ret = snd_soc_register_dai(&wm8741_dai); | |
478 | if (ret != 0) { | |
479 | dev_err(codec->dev, "Failed to register DAI: %d\n", ret); | |
480 | snd_soc_unregister_codec(codec); | |
481 | return ret; | |
482 | } | |
483 | ||
484 | dev_dbg(codec->dev, "Successful registration\n"); | |
485 | return 0; | |
486 | ||
487 | err_enable: | |
488 | regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies); | |
489 | ||
490 | err_get: | |
491 | regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies); | |
492 | ||
493 | err: | |
494 | kfree(wm8741); | |
495 | return ret; | |
496 | } | |
497 | ||
498 | static void wm8741_unregister(struct wm8741_priv *wm8741) | |
499 | { | |
500 | regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies); | |
501 | ||
502 | snd_soc_unregister_dai(&wm8741_dai); | |
503 | snd_soc_unregister_codec(&wm8741->codec); | |
504 | kfree(wm8741); | |
505 | wm8741_codec = NULL; | |
506 | } | |
507 | ||
508 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) | |
509 | static __devinit int wm8741_i2c_probe(struct i2c_client *i2c, | |
510 | const struct i2c_device_id *id) | |
511 | { | |
512 | struct wm8741_priv *wm8741; | |
513 | struct snd_soc_codec *codec; | |
514 | ||
515 | wm8741 = kzalloc(sizeof(struct wm8741_priv), GFP_KERNEL); | |
516 | if (wm8741 == NULL) | |
517 | return -ENOMEM; | |
518 | ||
519 | codec = &wm8741->codec; | |
520 | codec->hw_write = (hw_write_t)i2c_master_send; | |
521 | ||
522 | i2c_set_clientdata(i2c, wm8741); | |
523 | codec->control_data = i2c; | |
524 | ||
525 | codec->dev = &i2c->dev; | |
526 | ||
527 | return wm8741_register(wm8741, SND_SOC_I2C); | |
528 | } | |
529 | ||
530 | static __devexit int wm8741_i2c_remove(struct i2c_client *client) | |
531 | { | |
532 | struct wm8741_priv *wm8741 = i2c_get_clientdata(client); | |
533 | wm8741_unregister(wm8741); | |
534 | return 0; | |
535 | } | |
536 | ||
537 | static const struct i2c_device_id wm8741_i2c_id[] = { | |
538 | { "wm8741", 0 }, | |
539 | { } | |
540 | }; | |
541 | MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id); | |
542 | ||
543 | ||
544 | static struct i2c_driver wm8741_i2c_driver = { | |
545 | .driver = { | |
546 | .name = "WM8741", | |
547 | .owner = THIS_MODULE, | |
548 | }, | |
549 | .probe = wm8741_i2c_probe, | |
550 | .remove = __devexit_p(wm8741_i2c_remove), | |
551 | .id_table = wm8741_i2c_id, | |
552 | }; | |
553 | #endif | |
554 | ||
555 | static int __init wm8741_modinit(void) | |
556 | { | |
557 | int ret; | |
558 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) | |
559 | ret = i2c_add_driver(&wm8741_i2c_driver); | |
560 | if (ret != 0) { | |
561 | printk(KERN_ERR "Failed to register WM8741 I2C driver: %d\n", | |
562 | ret); | |
563 | } | |
564 | #endif | |
565 | return 0; | |
566 | } | |
567 | module_init(wm8741_modinit); | |
568 | ||
569 | static void __exit wm8741_exit(void) | |
570 | { | |
571 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) | |
572 | i2c_del_driver(&wm8741_i2c_driver); | |
573 | #endif | |
574 | } | |
575 | module_exit(wm8741_exit); | |
576 | ||
577 | MODULE_DESCRIPTION("ASoC WM8741 driver"); | |
578 | MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>"); | |
579 | MODULE_LICENSE("GPL"); |