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/version.h>
27 #include <linux/kernel.h>
28 #include <linux/init.h>
29 #include <linux/firmware.h>
30 #include <linux/delay.h>
32 #include <linux/i2c.h>
33 #include <linux/platform_device.h>
34 #include <linux/debugfs.h>
35 #include <linux/slab.h>
36 #include <sound/core.h>
37 #include <sound/pcm.h>
38 #include <sound/pcm_params.h>
39 #include <sound/soc.h>
40 #include <sound/soc-dapm.h>
41 #include <sound/initval.h>
42 #include <sound/tlv.h>
44 #include <sound/wm2000.h>
48 enum wm2000_anc_mode {
56 struct i2c_client *i2c;
58 enum wm2000_anc_mode anc_mode;
60 unsigned int anc_active:1;
61 unsigned int anc_eng_ena:1;
62 unsigned int spk_ena:1;
64 unsigned int mclk_div:1;
65 unsigned int speech_clarity:1;
67 int anc_download_size;
71 static struct i2c_client *wm2000_i2c;
73 static int wm2000_write(struct i2c_client *i2c, unsigned int reg,
79 data[0] = (reg >> 8) & 0xff;
81 data[2] = value & 0xff;
83 dev_vdbg(&i2c->dev, "write %x = %x\n", reg, value);
85 ret = i2c_master_send(i2c, data, 3);
94 static unsigned int wm2000_read(struct i2c_client *i2c, unsigned int r)
96 struct i2c_msg xfer[2];
102 reg[0] = (r >> 8) & 0xff;
104 xfer[0].addr = i2c->addr;
106 xfer[0].len = sizeof(reg);
107 xfer[0].buf = ®[0];
110 xfer[1].addr = i2c->addr;
111 xfer[1].flags = I2C_M_RD;
115 ret = i2c_transfer(i2c->adapter, xfer, 2);
117 dev_err(&i2c->dev, "i2c_transfer() returned %d\n", ret);
121 dev_vdbg(&i2c->dev, "read %x from %x\n", data, r);
126 static void wm2000_reset(struct wm2000_priv *wm2000)
128 struct i2c_client *i2c = wm2000->i2c;
130 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
131 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
132 wm2000_write(i2c, WM2000_REG_ID1, 0);
134 wm2000->anc_mode = ANC_OFF;
137 static int wm2000_poll_bit(struct i2c_client *i2c,
138 unsigned int reg, u8 mask, int timeout)
142 val = wm2000_read(i2c, reg);
144 while (!(val & mask) && --timeout) {
146 val = wm2000_read(i2c, reg);
155 static int wm2000_power_up(struct i2c_client *i2c, int analogue)
157 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
160 BUG_ON(wm2000->anc_mode != ANC_OFF);
162 dev_dbg(&i2c->dev, "Beginning power up\n");
164 if (!wm2000->mclk_div) {
165 dev_dbg(&i2c->dev, "Disabling MCLK divider\n");
166 wm2000_write(i2c, WM2000_REG_SYS_CTL2,
167 WM2000_MCLK_DIV2_ENA_CLR);
169 dev_dbg(&i2c->dev, "Enabling MCLK divider\n");
170 wm2000_write(i2c, WM2000_REG_SYS_CTL2,
171 WM2000_MCLK_DIV2_ENA_SET);
174 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
175 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_SET);
177 /* Wait for ANC engine to become ready */
178 if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
179 WM2000_ANC_ENG_IDLE, 1)) {
180 dev_err(&i2c->dev, "ANC engine failed to reset\n");
184 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
185 WM2000_STATUS_BOOT_COMPLETE, 1)) {
186 dev_err(&i2c->dev, "ANC engine failed to initialise\n");
190 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
192 /* Open code download of the data since it is the only bulk
194 dev_dbg(&i2c->dev, "Downloading %d bytes\n",
195 wm2000->anc_download_size - 2);
197 ret = i2c_master_send(i2c, wm2000->anc_download,
198 wm2000->anc_download_size);
200 dev_err(&i2c->dev, "i2c_transfer() failed: %d\n", ret);
203 if (ret != wm2000->anc_download_size) {
204 dev_err(&i2c->dev, "i2c_transfer() failed, %d != %d\n",
205 ret, wm2000->anc_download_size);
209 dev_dbg(&i2c->dev, "Download complete\n");
213 wm2000_write(i2c, WM2000_REG_ANA_VMID_PU_TIME, timeout / 4);
215 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
216 WM2000_MODE_ANA_SEQ_INCLUDE |
217 WM2000_MODE_MOUSE_ENABLE |
218 WM2000_MODE_THERMAL_ENABLE);
222 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
223 WM2000_MODE_MOUSE_ENABLE |
224 WM2000_MODE_THERMAL_ENABLE);
227 ret = wm2000_read(i2c, WM2000_REG_SPEECH_CLARITY);
228 if (wm2000->speech_clarity)
229 ret &= ~WM2000_SPEECH_CLARITY;
231 ret |= WM2000_SPEECH_CLARITY;
232 wm2000_write(i2c, WM2000_REG_SPEECH_CLARITY, ret);
234 wm2000_write(i2c, WM2000_REG_SYS_START0, 0x33);
235 wm2000_write(i2c, WM2000_REG_SYS_START1, 0x02);
237 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
239 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
240 WM2000_STATUS_MOUSE_ACTIVE, timeout)) {
241 dev_err(&i2c->dev, "Timed out waiting for device after %dms\n",
246 dev_dbg(&i2c->dev, "ANC active\n");
248 dev_dbg(&i2c->dev, "Analogue active\n");
249 wm2000->anc_mode = ANC_ACTIVE;
254 static int wm2000_power_down(struct i2c_client *i2c, int analogue)
256 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
261 wm2000_write(i2c, WM2000_REG_ANA_VMID_PD_TIME, timeout / 4);
262 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
263 WM2000_MODE_ANA_SEQ_INCLUDE |
264 WM2000_MODE_POWER_DOWN);
267 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
268 WM2000_MODE_POWER_DOWN);
271 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
272 WM2000_STATUS_POWER_DOWN_COMPLETE, timeout)) {
273 dev_err(&i2c->dev, "Timeout waiting for ANC power down\n");
277 if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
278 WM2000_ANC_ENG_IDLE, 1)) {
279 dev_err(&i2c->dev, "Timeout waiting for ANC engine idle\n");
283 dev_dbg(&i2c->dev, "powered off\n");
284 wm2000->anc_mode = ANC_OFF;
289 static int wm2000_enter_bypass(struct i2c_client *i2c, int analogue)
291 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
293 BUG_ON(wm2000->anc_mode != ANC_ACTIVE);
296 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
297 WM2000_MODE_ANA_SEQ_INCLUDE |
298 WM2000_MODE_THERMAL_ENABLE |
299 WM2000_MODE_BYPASS_ENTRY);
301 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
302 WM2000_MODE_THERMAL_ENABLE |
303 WM2000_MODE_BYPASS_ENTRY);
306 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
307 WM2000_STATUS_ANC_DISABLED, 10)) {
308 dev_err(&i2c->dev, "Timeout waiting for ANC disable\n");
312 if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
313 WM2000_ANC_ENG_IDLE, 1)) {
314 dev_err(&i2c->dev, "Timeout waiting for ANC engine idle\n");
318 wm2000_write(i2c, WM2000_REG_SYS_CTL1, WM2000_SYS_STBY);
319 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
321 wm2000->anc_mode = ANC_BYPASS;
322 dev_dbg(&i2c->dev, "bypass enabled\n");
327 static int wm2000_exit_bypass(struct i2c_client *i2c, int analogue)
329 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
331 BUG_ON(wm2000->anc_mode != ANC_BYPASS);
333 wm2000_write(i2c, WM2000_REG_SYS_CTL1, 0);
336 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
337 WM2000_MODE_ANA_SEQ_INCLUDE |
338 WM2000_MODE_MOUSE_ENABLE |
339 WM2000_MODE_THERMAL_ENABLE);
341 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
342 WM2000_MODE_MOUSE_ENABLE |
343 WM2000_MODE_THERMAL_ENABLE);
346 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
347 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
349 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
350 WM2000_STATUS_MOUSE_ACTIVE, 10)) {
351 dev_err(&i2c->dev, "Timed out waiting for MOUSE\n");
355 wm2000->anc_mode = ANC_ACTIVE;
356 dev_dbg(&i2c->dev, "MOUSE active\n");
361 static int wm2000_enter_standby(struct i2c_client *i2c, int analogue)
363 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
366 BUG_ON(wm2000->anc_mode != ANC_ACTIVE);
370 wm2000_write(i2c, WM2000_REG_ANA_VMID_PD_TIME, timeout / 4);
372 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
373 WM2000_MODE_ANA_SEQ_INCLUDE |
374 WM2000_MODE_THERMAL_ENABLE |
375 WM2000_MODE_STANDBY_ENTRY);
379 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
380 WM2000_MODE_THERMAL_ENABLE |
381 WM2000_MODE_STANDBY_ENTRY);
384 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
385 WM2000_STATUS_ANC_DISABLED, timeout)) {
387 "Timed out waiting for ANC disable after 1ms\n");
391 if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT, WM2000_ANC_ENG_IDLE,
394 "Timed out waiting for standby after %dms\n",
399 wm2000_write(i2c, WM2000_REG_SYS_CTL1, WM2000_SYS_STBY);
400 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
402 wm2000->anc_mode = ANC_STANDBY;
403 dev_dbg(&i2c->dev, "standby\n");
405 dev_dbg(&i2c->dev, "Analogue disabled\n");
410 static int wm2000_exit_standby(struct i2c_client *i2c, int analogue)
412 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
415 BUG_ON(wm2000->anc_mode != ANC_STANDBY);
417 wm2000_write(i2c, WM2000_REG_SYS_CTL1, 0);
421 wm2000_write(i2c, WM2000_REG_ANA_VMID_PU_TIME, timeout / 4);
423 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
424 WM2000_MODE_ANA_SEQ_INCLUDE |
425 WM2000_MODE_THERMAL_ENABLE |
426 WM2000_MODE_MOUSE_ENABLE);
430 wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
431 WM2000_MODE_THERMAL_ENABLE |
432 WM2000_MODE_MOUSE_ENABLE);
435 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
436 wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
438 if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
439 WM2000_STATUS_MOUSE_ACTIVE, timeout)) {
440 dev_err(&i2c->dev, "Timed out waiting for MOUSE after %dms\n",
445 wm2000->anc_mode = ANC_ACTIVE;
446 dev_dbg(&i2c->dev, "MOUSE active\n");
448 dev_dbg(&i2c->dev, "Analogue enabled\n");
453 typedef int (*wm2000_mode_fn)(struct i2c_client *i2c, int analogue);
456 enum wm2000_anc_mode source;
457 enum wm2000_anc_mode dest;
459 wm2000_mode_fn step[2];
460 } anc_transitions[] = {
474 wm2000_enter_standby,
487 .source = ANC_ACTIVE,
495 .source = ANC_ACTIVE,
499 wm2000_enter_standby,
503 .source = ANC_ACTIVE,
511 .source = ANC_BYPASS,
519 .source = ANC_BYPASS,
524 wm2000_enter_standby,
528 .source = ANC_BYPASS,
536 .source = ANC_STANDBY,
544 .source = ANC_STANDBY,
553 .source = ANC_STANDBY,
562 static int wm2000_anc_transition(struct wm2000_priv *wm2000,
563 enum wm2000_anc_mode mode)
565 struct i2c_client *i2c = wm2000->i2c;
569 if (wm2000->anc_mode == mode)
572 for (i = 0; i < ARRAY_SIZE(anc_transitions); i++)
573 if (anc_transitions[i].source == wm2000->anc_mode &&
574 anc_transitions[i].dest == mode)
576 if (i == ARRAY_SIZE(anc_transitions)) {
577 dev_err(&i2c->dev, "No transition for %d->%d\n",
578 wm2000->anc_mode, mode);
582 for (j = 0; j < ARRAY_SIZE(anc_transitions[j].step); j++) {
583 if (!anc_transitions[i].step[j])
585 ret = anc_transitions[i].step[j](i2c,
586 anc_transitions[i].analogue);
594 static int wm2000_anc_set_mode(struct wm2000_priv *wm2000)
596 struct i2c_client *i2c = wm2000->i2c;
597 enum wm2000_anc_mode mode;
599 if (wm2000->anc_eng_ena && wm2000->spk_ena)
600 if (wm2000->anc_active)
607 dev_dbg(&i2c->dev, "Set mode %d (enabled %d, mute %d, active %d)\n",
608 mode, wm2000->anc_eng_ena, !wm2000->spk_ena,
611 return wm2000_anc_transition(wm2000, mode);
614 static int wm2000_anc_mode_get(struct snd_kcontrol *kcontrol,
615 struct snd_ctl_elem_value *ucontrol)
617 struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);
619 ucontrol->value.enumerated.item[0] = wm2000->anc_active;
624 static int wm2000_anc_mode_put(struct snd_kcontrol *kcontrol,
625 struct snd_ctl_elem_value *ucontrol)
627 struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);
628 int anc_active = ucontrol->value.enumerated.item[0];
633 wm2000->anc_active = anc_active;
635 return wm2000_anc_set_mode(wm2000);
638 static int wm2000_speaker_get(struct snd_kcontrol *kcontrol,
639 struct snd_ctl_elem_value *ucontrol)
641 struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);
643 ucontrol->value.enumerated.item[0] = wm2000->spk_ena;
648 static int wm2000_speaker_put(struct snd_kcontrol *kcontrol,
649 struct snd_ctl_elem_value *ucontrol)
651 struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);
652 int val = ucontrol->value.enumerated.item[0];
657 wm2000->spk_ena = val;
659 return wm2000_anc_set_mode(wm2000);
662 static const struct snd_kcontrol_new wm2000_controls[] = {
663 SOC_SINGLE_BOOL_EXT("WM2000 ANC Switch", 0,
665 wm2000_anc_mode_put),
666 SOC_SINGLE_BOOL_EXT("WM2000 Switch", 0,
671 static int wm2000_anc_power_event(struct snd_soc_dapm_widget *w,
672 struct snd_kcontrol *kcontrol, int event)
674 struct wm2000_priv *wm2000 = dev_get_drvdata(&wm2000_i2c->dev);
676 if (SND_SOC_DAPM_EVENT_ON(event))
677 wm2000->anc_eng_ena = 1;
679 if (SND_SOC_DAPM_EVENT_OFF(event))
680 wm2000->anc_eng_ena = 0;
682 return wm2000_anc_set_mode(wm2000);
685 static const struct snd_soc_dapm_widget wm2000_dapm_widgets[] = {
686 /* Externally visible pins */
687 SND_SOC_DAPM_OUTPUT("WM2000 SPKN"),
688 SND_SOC_DAPM_OUTPUT("WM2000 SPKP"),
690 SND_SOC_DAPM_INPUT("WM2000 LINN"),
691 SND_SOC_DAPM_INPUT("WM2000 LINP"),
693 SND_SOC_DAPM_PGA_E("ANC Engine", SND_SOC_NOPM, 0, 0, NULL, 0,
694 wm2000_anc_power_event,
695 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
698 /* Target, Path, Source */
699 static const struct snd_soc_dapm_route audio_map[] = {
700 { "WM2000 SPKN", NULL, "ANC Engine" },
701 { "WM2000 SPKP", NULL, "ANC Engine" },
702 { "ANC Engine", NULL, "WM2000 LINN" },
703 { "ANC Engine", NULL, "WM2000 LINP" },
706 /* Called from the machine driver */
707 int wm2000_add_controls(struct snd_soc_codec *codec)
712 pr_err("WM2000 not yet probed\n");
716 ret = snd_soc_dapm_new_controls(codec, wm2000_dapm_widgets,
717 ARRAY_SIZE(wm2000_dapm_widgets));
721 ret = snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
725 return snd_soc_add_controls(codec, wm2000_controls,
726 ARRAY_SIZE(wm2000_controls));
728 EXPORT_SYMBOL_GPL(wm2000_add_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;
741 dev_err(&i2c->dev, "Another WM2000 is already registered\n");
745 wm2000 = kzalloc(sizeof(struct wm2000_priv), GFP_KERNEL);
746 if (wm2000 == NULL) {
747 dev_err(&i2c->dev, "Unable to allocate private data\n");
751 /* Verify that this is a WM2000 */
752 reg = wm2000_read(i2c, WM2000_REG_ID1);
754 reg = wm2000_read(i2c, WM2000_REG_ID2);
758 dev_err(&i2c->dev, "Device is not a WM2000 - ID %x\n", id);
763 reg = wm2000_read(i2c, WM2000_REG_REVISON);
764 dev_info(&i2c->dev, "revision %c\n", reg + 'A');
766 filename = "wm2000_anc.bin";
767 pdata = dev_get_platdata(&i2c->dev);
769 wm2000->mclk_div = pdata->mclkdiv2;
770 wm2000->speech_clarity = !pdata->speech_enh_disable;
772 if (pdata->download_file)
773 filename = pdata->download_file;
776 ret = request_firmware(&fw, filename, &i2c->dev);
778 dev_err(&i2c->dev, "Failed to acquire ANC data: %d\n", ret);
782 /* Pre-cook the concatenation of the register address onto the image */
783 wm2000->anc_download_size = fw->size + 2;
784 wm2000->anc_download = kmalloc(wm2000->anc_download_size, GFP_KERNEL);
785 if (wm2000->anc_download == NULL) {
786 dev_err(&i2c->dev, "Out of memory\n");
791 wm2000->anc_download[0] = 0x80;
792 wm2000->anc_download[1] = 0x00;
793 memcpy(wm2000->anc_download + 2, fw->data, fw->size);
795 release_firmware(fw);
797 dev_set_drvdata(&i2c->dev, wm2000);
798 wm2000->anc_eng_ena = 1;
801 wm2000_reset(wm2000);
803 /* This will trigger a transition to standby mode by default */
804 wm2000_anc_set_mode(wm2000);
811 release_firmware(fw);
817 static __devexit int wm2000_i2c_remove(struct i2c_client *i2c)
819 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
821 wm2000_anc_transition(wm2000, ANC_OFF);
824 kfree(wm2000->anc_download);
830 static void wm2000_i2c_shutdown(struct i2c_client *i2c)
832 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
834 wm2000_anc_transition(wm2000, ANC_OFF);
838 static int wm2000_i2c_suspend(struct i2c_client *i2c, pm_message_t mesg)
840 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
842 return wm2000_anc_transition(wm2000, ANC_OFF);
845 static int wm2000_i2c_resume(struct i2c_client *i2c)
847 struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
849 return wm2000_anc_set_mode(wm2000);
852 #define wm2000_i2c_suspend NULL
853 #define wm2000_i2c_resume NULL
856 static const struct i2c_device_id wm2000_i2c_id[] = {
860 MODULE_DEVICE_TABLE(i2c, wm2000_i2c_id);
862 static struct i2c_driver wm2000_i2c_driver = {
865 .owner = THIS_MODULE,
867 .probe = wm2000_i2c_probe,
868 .remove = __devexit_p(wm2000_i2c_remove),
869 .suspend = wm2000_i2c_suspend,
870 .resume = wm2000_i2c_resume,
871 .shutdown = wm2000_i2c_shutdown,
872 .id_table = wm2000_i2c_id,
875 static int __init wm2000_init(void)
877 return i2c_add_driver(&wm2000_i2c_driver);
879 module_init(wm2000_init);
881 static void __exit wm2000_exit(void)
883 i2c_del_driver(&wm2000_i2c_driver);
885 module_exit(wm2000_exit);
887 MODULE_DESCRIPTION("ASoC WM2000 driver");
888 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfonmicro.com>");
889 MODULE_LICENSE("GPL");