2 * wm2000.c -- WM2000 ALSA Soc Audio driver
4 * Copyright 2008-2010 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * The download image for the WM2000 will be requested as
13 * 'wm2000_anc.bin' by default (overridable via platform data) at
14 * runtime and is expected to be in flat binary format. This is
15 * generated by Wolfson configuration tools and includes
16 * system-specific callibration information. If supplied as a
17 * sequence of ASCII-encoded hexidecimal bytes this can be converted
18 * into a flat binary with a command such as this on the command line:
20 * perl -e 'while (<>) { s/[\r\n]+// ; printf("%c", hex($_)); }'
21 * < file > wm2000_anc.bin
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/firmware.h>
29 #include <linux/delay.h>
31 #include <linux/i2c.h>
32 #include <linux/regmap.h>
33 #include <linux/debugfs.h>
34 #include <linux/slab.h>
35 #include <sound/core.h>
36 #include <sound/pcm.h>
37 #include <sound/pcm_params.h>
38 #include <sound/soc.h>
39 #include <sound/initval.h>
40 #include <sound/tlv.h>
42 #include <sound/wm2000.h>
46 enum wm2000_anc_mode {
54 struct i2c_client *i2c;
55 struct regmap *regmap;
57 enum wm2000_anc_mode anc_mode;
59 unsigned int anc_active:1;
60 unsigned int anc_eng_ena:1;
61 unsigned int spk_ena:1;
63 unsigned int mclk_div:1;
64 unsigned int speech_clarity:1;
66 int anc_download_size;
70 static int wm2000_write(struct i2c_client *i2c, unsigned int reg,
73 struct wm2000_priv *wm2000 = i2c_get_clientdata(i2c);
74 return regmap_write(wm2000->regmap, reg, value);
77 static unsigned int wm2000_read(struct i2c_client *i2c, unsigned int r)
79 struct wm2000_priv *wm2000 = i2c_get_clientdata(i2c);
83 ret = regmap_read(wm2000->regmap, r, &val);
90 static void wm2000_reset(struct wm2000_priv *wm2000)
92 struct i2c_client *i2c = wm2000->i2c;
94 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
95 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
96 wm2000_write(i2c, WM2000_REG_ID1, 0);
98 wm2000->anc_mode = ANC_OFF;
101 static int wm2000_poll_bit(struct i2c_client *i2c,
102 unsigned int reg, u8 mask, int timeout)
106 val = wm2000_read(i2c, reg);
108 while (!(val & mask) && --timeout) {
110 val = wm2000_read(i2c, reg);
119 static int wm2000_power_up(struct i2c_client *i2c, int analogue)
121 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
124 BUG_ON(wm2000->anc_mode != ANC_OFF);
126 dev_dbg(&i2c->dev, "Beginning power up\n");
128 if (!wm2000->mclk_div) {
129 dev_dbg(&i2c->dev, "Disabling MCLK divider\n");
130 wm2000_write(i2c, WM2000_REG_SYS_CTL2,
131 WM2000_MCLK_DIV2_ENA_CLR);
133 dev_dbg(&i2c->dev, "Enabling MCLK divider\n");
134 wm2000_write(i2c, WM2000_REG_SYS_CTL2,
135 WM2000_MCLK_DIV2_ENA_SET);
138 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
139 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_SET);
141 /* Wait for ANC engine to become ready */
142 if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
143 WM2000_ANC_ENG_IDLE, 1)) {
144 dev_err(&i2c->dev, "ANC engine failed to reset\n");
148 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
149 WM2000_STATUS_BOOT_COMPLETE, 1)) {
150 dev_err(&i2c->dev, "ANC engine failed to initialise\n");
154 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
156 /* Open code download of the data since it is the only bulk
158 dev_dbg(&i2c->dev, "Downloading %d bytes\n",
159 wm2000->anc_download_size - 2);
161 ret = i2c_master_send(i2c, wm2000->anc_download,
162 wm2000->anc_download_size);
164 dev_err(&i2c->dev, "i2c_transfer() failed: %d\n", ret);
167 if (ret != wm2000->anc_download_size) {
168 dev_err(&i2c->dev, "i2c_transfer() failed, %d != %d\n",
169 ret, wm2000->anc_download_size);
173 dev_dbg(&i2c->dev, "Download complete\n");
177 wm2000_write(i2c, WM2000_REG_ANA_VMID_PU_TIME, timeout / 4);
179 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
180 WM2000_MODE_ANA_SEQ_INCLUDE |
181 WM2000_MODE_MOUSE_ENABLE |
182 WM2000_MODE_THERMAL_ENABLE);
186 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
187 WM2000_MODE_MOUSE_ENABLE |
188 WM2000_MODE_THERMAL_ENABLE);
191 ret = wm2000_read(i2c, WM2000_REG_SPEECH_CLARITY);
192 if (wm2000->speech_clarity)
193 ret &= ~WM2000_SPEECH_CLARITY;
195 ret |= WM2000_SPEECH_CLARITY;
196 wm2000_write(i2c, WM2000_REG_SPEECH_CLARITY, ret);
198 wm2000_write(i2c, WM2000_REG_SYS_START0, 0x33);
199 wm2000_write(i2c, WM2000_REG_SYS_START1, 0x02);
201 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
203 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
204 WM2000_STATUS_MOUSE_ACTIVE, timeout)) {
205 dev_err(&i2c->dev, "Timed out waiting for device after %dms\n",
210 dev_dbg(&i2c->dev, "ANC active\n");
212 dev_dbg(&i2c->dev, "Analogue active\n");
213 wm2000->anc_mode = ANC_ACTIVE;
218 static int wm2000_power_down(struct i2c_client *i2c, int analogue)
220 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
225 wm2000_write(i2c, WM2000_REG_ANA_VMID_PD_TIME, timeout / 4);
226 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
227 WM2000_MODE_ANA_SEQ_INCLUDE |
228 WM2000_MODE_POWER_DOWN);
231 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
232 WM2000_MODE_POWER_DOWN);
235 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
236 WM2000_STATUS_POWER_DOWN_COMPLETE, timeout)) {
237 dev_err(&i2c->dev, "Timeout waiting for ANC power down\n");
241 if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
242 WM2000_ANC_ENG_IDLE, 1)) {
243 dev_err(&i2c->dev, "Timeout waiting for ANC engine idle\n");
247 dev_dbg(&i2c->dev, "powered off\n");
248 wm2000->anc_mode = ANC_OFF;
253 static int wm2000_enter_bypass(struct i2c_client *i2c, int analogue)
255 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
257 BUG_ON(wm2000->anc_mode != ANC_ACTIVE);
260 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
261 WM2000_MODE_ANA_SEQ_INCLUDE |
262 WM2000_MODE_THERMAL_ENABLE |
263 WM2000_MODE_BYPASS_ENTRY);
265 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
266 WM2000_MODE_THERMAL_ENABLE |
267 WM2000_MODE_BYPASS_ENTRY);
270 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
271 WM2000_STATUS_ANC_DISABLED, 10)) {
272 dev_err(&i2c->dev, "Timeout waiting for ANC disable\n");
276 if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
277 WM2000_ANC_ENG_IDLE, 1)) {
278 dev_err(&i2c->dev, "Timeout waiting for ANC engine idle\n");
282 wm2000_write(i2c, WM2000_REG_SYS_CTL1, WM2000_SYS_STBY);
283 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
285 wm2000->anc_mode = ANC_BYPASS;
286 dev_dbg(&i2c->dev, "bypass enabled\n");
291 static int wm2000_exit_bypass(struct i2c_client *i2c, int analogue)
293 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
295 BUG_ON(wm2000->anc_mode != ANC_BYPASS);
297 wm2000_write(i2c, WM2000_REG_SYS_CTL1, 0);
300 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
301 WM2000_MODE_ANA_SEQ_INCLUDE |
302 WM2000_MODE_MOUSE_ENABLE |
303 WM2000_MODE_THERMAL_ENABLE);
305 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
306 WM2000_MODE_MOUSE_ENABLE |
307 WM2000_MODE_THERMAL_ENABLE);
310 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
311 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
313 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
314 WM2000_STATUS_MOUSE_ACTIVE, 10)) {
315 dev_err(&i2c->dev, "Timed out waiting for MOUSE\n");
319 wm2000->anc_mode = ANC_ACTIVE;
320 dev_dbg(&i2c->dev, "MOUSE active\n");
325 static int wm2000_enter_standby(struct i2c_client *i2c, int analogue)
327 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
330 BUG_ON(wm2000->anc_mode != ANC_ACTIVE);
334 wm2000_write(i2c, WM2000_REG_ANA_VMID_PD_TIME, timeout / 4);
336 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
337 WM2000_MODE_ANA_SEQ_INCLUDE |
338 WM2000_MODE_THERMAL_ENABLE |
339 WM2000_MODE_STANDBY_ENTRY);
343 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
344 WM2000_MODE_THERMAL_ENABLE |
345 WM2000_MODE_STANDBY_ENTRY);
348 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
349 WM2000_STATUS_ANC_DISABLED, timeout)) {
351 "Timed out waiting for ANC disable after 1ms\n");
355 if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT, WM2000_ANC_ENG_IDLE,
358 "Timed out waiting for standby after %dms\n",
363 wm2000_write(i2c, WM2000_REG_SYS_CTL1, WM2000_SYS_STBY);
364 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
366 wm2000->anc_mode = ANC_STANDBY;
367 dev_dbg(&i2c->dev, "standby\n");
369 dev_dbg(&i2c->dev, "Analogue disabled\n");
374 static int wm2000_exit_standby(struct i2c_client *i2c, int analogue)
376 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
379 BUG_ON(wm2000->anc_mode != ANC_STANDBY);
381 wm2000_write(i2c, WM2000_REG_SYS_CTL1, 0);
385 wm2000_write(i2c, WM2000_REG_ANA_VMID_PU_TIME, timeout / 4);
387 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
388 WM2000_MODE_ANA_SEQ_INCLUDE |
389 WM2000_MODE_THERMAL_ENABLE |
390 WM2000_MODE_MOUSE_ENABLE);
394 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
395 WM2000_MODE_THERMAL_ENABLE |
396 WM2000_MODE_MOUSE_ENABLE);
399 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
400 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
402 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
403 WM2000_STATUS_MOUSE_ACTIVE, timeout)) {
404 dev_err(&i2c->dev, "Timed out waiting for MOUSE after %dms\n",
409 wm2000->anc_mode = ANC_ACTIVE;
410 dev_dbg(&i2c->dev, "MOUSE active\n");
412 dev_dbg(&i2c->dev, "Analogue enabled\n");
417 typedef int (*wm2000_mode_fn)(struct i2c_client *i2c, int analogue);
420 enum wm2000_anc_mode source;
421 enum wm2000_anc_mode dest;
423 wm2000_mode_fn step[2];
424 } anc_transitions[] = {
438 wm2000_enter_standby,
451 .source = ANC_ACTIVE,
459 .source = ANC_ACTIVE,
463 wm2000_enter_standby,
467 .source = ANC_ACTIVE,
475 .source = ANC_BYPASS,
483 .source = ANC_BYPASS,
488 wm2000_enter_standby,
492 .source = ANC_BYPASS,
500 .source = ANC_STANDBY,
508 .source = ANC_STANDBY,
517 .source = ANC_STANDBY,
526 static int wm2000_anc_transition(struct wm2000_priv *wm2000,
527 enum wm2000_anc_mode mode)
529 struct i2c_client *i2c = wm2000->i2c;
533 if (wm2000->anc_mode == mode)
536 for (i = 0; i < ARRAY_SIZE(anc_transitions); i++)
537 if (anc_transitions[i].source == wm2000->anc_mode &&
538 anc_transitions[i].dest == mode)
540 if (i == ARRAY_SIZE(anc_transitions)) {
541 dev_err(&i2c->dev, "No transition for %d->%d\n",
542 wm2000->anc_mode, mode);
546 for (j = 0; j < ARRAY_SIZE(anc_transitions[j].step); j++) {
547 if (!anc_transitions[i].step[j])
549 ret = anc_transitions[i].step[j](i2c,
550 anc_transitions[i].analogue);
558 static int wm2000_anc_set_mode(struct wm2000_priv *wm2000)
560 struct i2c_client *i2c = wm2000->i2c;
561 enum wm2000_anc_mode mode;
563 if (wm2000->anc_eng_ena && wm2000->spk_ena)
564 if (wm2000->anc_active)
571 dev_dbg(&i2c->dev, "Set mode %d (enabled %d, mute %d, active %d)\n",
572 mode, wm2000->anc_eng_ena, !wm2000->spk_ena,
575 return wm2000_anc_transition(wm2000, mode);
578 static int wm2000_anc_mode_get(struct snd_kcontrol *kcontrol,
579 struct snd_ctl_elem_value *ucontrol)
581 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
582 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
584 ucontrol->value.enumerated.item[0] = wm2000->anc_active;
589 static int wm2000_anc_mode_put(struct snd_kcontrol *kcontrol,
590 struct snd_ctl_elem_value *ucontrol)
592 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
593 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
594 int anc_active = ucontrol->value.enumerated.item[0];
599 wm2000->anc_active = anc_active;
601 return wm2000_anc_set_mode(wm2000);
604 static int wm2000_speaker_get(struct snd_kcontrol *kcontrol,
605 struct snd_ctl_elem_value *ucontrol)
607 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
608 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
610 ucontrol->value.enumerated.item[0] = wm2000->spk_ena;
615 static int wm2000_speaker_put(struct snd_kcontrol *kcontrol,
616 struct snd_ctl_elem_value *ucontrol)
618 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
619 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
620 int val = ucontrol->value.enumerated.item[0];
625 wm2000->spk_ena = val;
627 return wm2000_anc_set_mode(wm2000);
630 static const struct snd_kcontrol_new wm2000_controls[] = {
631 SOC_SINGLE_BOOL_EXT("WM2000 ANC Switch", 0,
633 wm2000_anc_mode_put),
634 SOC_SINGLE_BOOL_EXT("WM2000 Switch", 0,
639 static int wm2000_anc_power_event(struct snd_soc_dapm_widget *w,
640 struct snd_kcontrol *kcontrol, int event)
642 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
643 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
645 if (SND_SOC_DAPM_EVENT_ON(event))
646 wm2000->anc_eng_ena = 1;
648 if (SND_SOC_DAPM_EVENT_OFF(event))
649 wm2000->anc_eng_ena = 0;
651 return wm2000_anc_set_mode(wm2000);
654 static const struct snd_soc_dapm_widget wm2000_dapm_widgets[] = {
655 /* Externally visible pins */
656 SND_SOC_DAPM_OUTPUT("SPKN"),
657 SND_SOC_DAPM_OUTPUT("SPKP"),
659 SND_SOC_DAPM_INPUT("LINN"),
660 SND_SOC_DAPM_INPUT("LINP"),
662 SND_SOC_DAPM_PGA_E("ANC Engine", SND_SOC_NOPM, 0, 0, NULL, 0,
663 wm2000_anc_power_event,
664 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
667 /* Target, Path, Source */
668 static const struct snd_soc_dapm_route wm2000_audio_map[] = {
669 { "SPKN", NULL, "ANC Engine" },
670 { "SPKP", NULL, "ANC Engine" },
671 { "ANC Engine", NULL, "LINN" },
672 { "ANC Engine", NULL, "LINP" },
676 static int wm2000_suspend(struct snd_soc_codec *codec)
678 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
680 return wm2000_anc_transition(wm2000, ANC_OFF);
683 static int wm2000_resume(struct snd_soc_codec *codec)
685 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
687 return wm2000_anc_set_mode(wm2000);
690 #define wm2000_suspend NULL
691 #define wm2000_resume NULL
694 static const struct regmap_config wm2000_regmap = {
699 static int wm2000_probe(struct snd_soc_codec *codec)
701 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
703 /* This will trigger a transition to standby mode by default */
704 wm2000_anc_set_mode(wm2000);
709 static int wm2000_remove(struct snd_soc_codec *codec)
711 struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
713 return wm2000_anc_transition(wm2000, ANC_OFF);
716 static struct snd_soc_codec_driver soc_codec_dev_wm2000 = {
717 .probe = wm2000_probe,
718 .remove = wm2000_remove,
719 .suspend = wm2000_suspend,
720 .resume = wm2000_resume,
722 .dapm_widgets = wm2000_dapm_widgets,
723 .num_dapm_widgets = ARRAY_SIZE(wm2000_dapm_widgets),
724 .dapm_routes = wm2000_audio_map,
725 .num_dapm_routes = ARRAY_SIZE(wm2000_audio_map),
726 .controls = wm2000_controls,
727 .num_controls = ARRAY_SIZE(wm2000_controls),
730 static int __devinit wm2000_i2c_probe(struct i2c_client *i2c,
731 const struct i2c_device_id *i2c_id)
733 struct wm2000_priv *wm2000;
734 struct wm2000_platform_data *pdata;
735 const char *filename;
736 const struct firmware *fw;
740 wm2000 = devm_kzalloc(&i2c->dev, sizeof(struct wm2000_priv),
742 if (wm2000 == NULL) {
743 dev_err(&i2c->dev, "Unable to allocate private data\n");
747 dev_set_drvdata(&i2c->dev, wm2000);
749 wm2000->regmap = regmap_init_i2c(i2c, &wm2000_regmap);
750 if (IS_ERR(wm2000->regmap)) {
751 ret = PTR_ERR(wm2000->regmap);
752 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
757 /* Verify that this is a WM2000 */
758 reg = wm2000_read(i2c, WM2000_REG_ID1);
760 reg = wm2000_read(i2c, WM2000_REG_ID2);
764 dev_err(&i2c->dev, "Device is not a WM2000 - ID %x\n", id);
769 reg = wm2000_read(i2c, WM2000_REG_REVISON);
770 dev_info(&i2c->dev, "revision %c\n", reg + 'A');
772 filename = "wm2000_anc.bin";
773 pdata = dev_get_platdata(&i2c->dev);
775 wm2000->mclk_div = pdata->mclkdiv2;
776 wm2000->speech_clarity = !pdata->speech_enh_disable;
778 if (pdata->download_file)
779 filename = pdata->download_file;
782 ret = request_firmware(&fw, filename, &i2c->dev);
784 dev_err(&i2c->dev, "Failed to acquire ANC data: %d\n", ret);
788 /* Pre-cook the concatenation of the register address onto the image */
789 wm2000->anc_download_size = fw->size + 2;
790 wm2000->anc_download = devm_kzalloc(&i2c->dev,
791 wm2000->anc_download_size,
793 if (wm2000->anc_download == NULL) {
794 dev_err(&i2c->dev, "Out of memory\n");
799 wm2000->anc_download[0] = 0x80;
800 wm2000->anc_download[1] = 0x00;
801 memcpy(wm2000->anc_download + 2, fw->data, fw->size);
803 release_firmware(fw);
805 wm2000->anc_eng_ena = 1;
806 wm2000->anc_active = 1;
810 wm2000_reset(wm2000);
812 ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm2000,
820 release_firmware(fw);
822 regmap_exit(wm2000->regmap);
827 static __devexit int wm2000_i2c_remove(struct i2c_client *i2c)
829 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
831 snd_soc_unregister_codec(&i2c->dev);
832 regmap_exit(wm2000->regmap);
837 static const struct i2c_device_id wm2000_i2c_id[] = {
841 MODULE_DEVICE_TABLE(i2c, wm2000_i2c_id);
843 static struct i2c_driver wm2000_i2c_driver = {
846 .owner = THIS_MODULE,
848 .probe = wm2000_i2c_probe,
849 .remove = __devexit_p(wm2000_i2c_remove),
850 .id_table = wm2000_i2c_id,
853 static int __init wm2000_init(void)
855 return i2c_add_driver(&wm2000_i2c_driver);
857 module_init(wm2000_init);
859 static void __exit wm2000_exit(void)
861 i2c_del_driver(&wm2000_i2c_driver);
863 module_exit(wm2000_exit);
865 MODULE_DESCRIPTION("ASoC WM2000 driver");
866 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfonmicro.com>");
867 MODULE_LICENSE("GPL");