2 * CS4270 ALSA SoC (ASoC) codec driver
4 * Author: Timur Tabi <timur@freescale.com>
6 * Copyright 2007-2009 Freescale Semiconductor, Inc. This file is licensed
7 * under the terms of the GNU General Public License version 2. This
8 * program is licensed "as is" without any warranty of any kind, whether
11 * This is an ASoC device driver for the Cirrus Logic CS4270 codec.
13 * Current features/limitations:
15 * - Software mode is supported. Stand-alone mode is not supported.
16 * - Only I2C is supported, not SPI
17 * - Support for master and slave mode
18 * - The machine driver's 'startup' function must call
19 * cs4270_set_dai_sysclk() with the value of MCLK.
20 * - Only I2S and left-justified modes are supported
21 * - Power management is supported
24 #include <linux/module.h>
25 #include <linux/platform_device.h>
26 #include <sound/core.h>
27 #include <sound/soc.h>
28 #include <sound/initval.h>
29 #include <linux/i2c.h>
30 #include <linux/delay.h>
31 #include <linux/regulator/consumer.h>
36 * The codec isn't really big-endian or little-endian, since the I2S
37 * interface requires data to be sent serially with the MSbit first.
38 * However, to support BE and LE I2S devices, we specify both here. That
39 * way, ALSA will always match the bit patterns.
41 #define CS4270_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
42 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \
43 SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \
44 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \
45 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \
46 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE)
48 /* CS4270 registers addresses */
49 #define CS4270_CHIPID 0x01 /* Chip ID */
50 #define CS4270_PWRCTL 0x02 /* Power Control */
51 #define CS4270_MODE 0x03 /* Mode Control */
52 #define CS4270_FORMAT 0x04 /* Serial Format, ADC/DAC Control */
53 #define CS4270_TRANS 0x05 /* Transition Control */
54 #define CS4270_MUTE 0x06 /* Mute Control */
55 #define CS4270_VOLA 0x07 /* DAC Channel A Volume Control */
56 #define CS4270_VOLB 0x08 /* DAC Channel B Volume Control */
58 #define CS4270_FIRSTREG 0x01
59 #define CS4270_LASTREG 0x08
60 #define CS4270_NUMREGS (CS4270_LASTREG - CS4270_FIRSTREG + 1)
61 #define CS4270_I2C_INCR 0x80
63 /* Bit masks for the CS4270 registers */
64 #define CS4270_CHIPID_ID 0xF0
65 #define CS4270_CHIPID_REV 0x0F
66 #define CS4270_PWRCTL_FREEZE 0x80
67 #define CS4270_PWRCTL_PDN_ADC 0x20
68 #define CS4270_PWRCTL_PDN_DAC 0x02
69 #define CS4270_PWRCTL_PDN 0x01
70 #define CS4270_PWRCTL_PDN_ALL \
71 (CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC | CS4270_PWRCTL_PDN)
72 #define CS4270_MODE_SPEED_MASK 0x30
73 #define CS4270_MODE_1X 0x00
74 #define CS4270_MODE_2X 0x10
75 #define CS4270_MODE_4X 0x20
76 #define CS4270_MODE_SLAVE 0x30
77 #define CS4270_MODE_DIV_MASK 0x0E
78 #define CS4270_MODE_DIV1 0x00
79 #define CS4270_MODE_DIV15 0x02
80 #define CS4270_MODE_DIV2 0x04
81 #define CS4270_MODE_DIV3 0x06
82 #define CS4270_MODE_DIV4 0x08
83 #define CS4270_MODE_POPGUARD 0x01
84 #define CS4270_FORMAT_FREEZE_A 0x80
85 #define CS4270_FORMAT_FREEZE_B 0x40
86 #define CS4270_FORMAT_LOOPBACK 0x20
87 #define CS4270_FORMAT_DAC_MASK 0x18
88 #define CS4270_FORMAT_DAC_LJ 0x00
89 #define CS4270_FORMAT_DAC_I2S 0x08
90 #define CS4270_FORMAT_DAC_RJ16 0x18
91 #define CS4270_FORMAT_DAC_RJ24 0x10
92 #define CS4270_FORMAT_ADC_MASK 0x01
93 #define CS4270_FORMAT_ADC_LJ 0x00
94 #define CS4270_FORMAT_ADC_I2S 0x01
95 #define CS4270_TRANS_ONE_VOL 0x80
96 #define CS4270_TRANS_SOFT 0x40
97 #define CS4270_TRANS_ZERO 0x20
98 #define CS4270_TRANS_INV_ADC_A 0x08
99 #define CS4270_TRANS_INV_ADC_B 0x10
100 #define CS4270_TRANS_INV_DAC_A 0x02
101 #define CS4270_TRANS_INV_DAC_B 0x04
102 #define CS4270_TRANS_DEEMPH 0x01
103 #define CS4270_MUTE_AUTO 0x20
104 #define CS4270_MUTE_ADC_A 0x08
105 #define CS4270_MUTE_ADC_B 0x10
106 #define CS4270_MUTE_POLARITY 0x04
107 #define CS4270_MUTE_DAC_A 0x01
108 #define CS4270_MUTE_DAC_B 0x02
110 static const char *supply_names[] = {
114 /* Private data for the CS4270 */
115 struct cs4270_private {
116 struct snd_soc_codec codec;
117 u8 reg_cache[CS4270_NUMREGS];
118 unsigned int mclk; /* Input frequency of the MCLK pin */
119 unsigned int mode; /* The mode (I2S or left-justified) */
120 unsigned int slave_mode;
121 unsigned int manual_mute;
123 /* power domain regulators */
124 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
128 * struct cs4270_mode_ratios - clock ratio tables
129 * @ratio: the ratio of MCLK to the sample rate
130 * @speed_mode: the Speed Mode bits to set in the Mode Control register for
132 * @mclk: the Ratio Select bits to set in the Mode Control register for this
135 * The data for this chart is taken from Table 5 of the CS4270 reference
138 * This table is used to determine how to program the Mode Control register.
139 * It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling
140 * rates the CS4270 currently supports.
142 * @speed_mode is the corresponding bit pattern to be written to the
143 * MODE bits of the Mode Control Register
145 * @mclk is the corresponding bit pattern to be wirten to the MCLK bits of
146 * the Mode Control Register.
148 * In situations where a single ratio is represented by multiple speed
149 * modes, we favor the slowest speed. E.g, for a ratio of 128, we pick
150 * double-speed instead of quad-speed. However, the CS4270 errata states
151 * that divide-By-1.5 can cause failures, so we avoid that mode where
154 * Errata: There is an errata for the CS4270 where divide-by-1.5 does not
155 * work if Vd is 3.3V. If this effects you, select the
156 * CONFIG_SND_SOC_CS4270_VD33_ERRATA Kconfig option, and the driver will
157 * never select any sample rates that require divide-by-1.5.
159 struct cs4270_mode_ratios {
165 static struct cs4270_mode_ratios cs4270_mode_ratios[] = {
166 {64, CS4270_MODE_4X, CS4270_MODE_DIV1},
167 #ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA
168 {96, CS4270_MODE_4X, CS4270_MODE_DIV15},
170 {128, CS4270_MODE_2X, CS4270_MODE_DIV1},
171 {192, CS4270_MODE_4X, CS4270_MODE_DIV3},
172 {256, CS4270_MODE_1X, CS4270_MODE_DIV1},
173 {384, CS4270_MODE_2X, CS4270_MODE_DIV3},
174 {512, CS4270_MODE_1X, CS4270_MODE_DIV2},
175 {768, CS4270_MODE_1X, CS4270_MODE_DIV3},
176 {1024, CS4270_MODE_1X, CS4270_MODE_DIV4}
179 /* The number of MCLK/LRCK ratios supported by the CS4270 */
180 #define NUM_MCLK_RATIOS ARRAY_SIZE(cs4270_mode_ratios)
183 * cs4270_set_dai_sysclk - determine the CS4270 samples rates.
184 * @codec_dai: the codec DAI
185 * @clk_id: the clock ID (ignored)
186 * @freq: the MCLK input frequency
187 * @dir: the clock direction (ignored)
189 * This function is used to tell the codec driver what the input MCLK
192 * The value of MCLK is used to determine which sample rates are supported
193 * by the CS4270. The ratio of MCLK / Fs must be equal to one of nine
194 * supported values - 64, 96, 128, 192, 256, 384, 512, 768, and 1024.
196 * This function calculates the nine ratios and determines which ones match
197 * a standard sample rate. If there's a match, then it is added to the list
198 * of supported sample rates.
200 * This function must be called by the machine driver's 'startup' function,
201 * otherwise the list of supported sample rates will not be available in
204 static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai,
205 int clk_id, unsigned int freq, int dir)
207 struct snd_soc_codec *codec = codec_dai->codec;
208 struct cs4270_private *cs4270 = codec->private_data;
209 unsigned int rates = 0;
210 unsigned int rate_min = -1;
211 unsigned int rate_max = 0;
216 for (i = 0; i < NUM_MCLK_RATIOS; i++) {
217 unsigned int rate = freq / cs4270_mode_ratios[i].ratio;
218 rates |= snd_pcm_rate_to_rate_bit(rate);
224 /* FIXME: soc should support a rate list */
225 rates &= ~SNDRV_PCM_RATE_KNOT;
228 dev_err(codec->dev, "could not find a valid sample rate\n");
232 codec_dai->playback.rates = rates;
233 codec_dai->playback.rate_min = rate_min;
234 codec_dai->playback.rate_max = rate_max;
236 codec_dai->capture.rates = rates;
237 codec_dai->capture.rate_min = rate_min;
238 codec_dai->capture.rate_max = rate_max;
244 * cs4270_set_dai_fmt - configure the codec for the selected audio format
245 * @codec_dai: the codec DAI
246 * @format: a SND_SOC_DAIFMT_x value indicating the data format
248 * This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the
251 * Currently, this function only supports SND_SOC_DAIFMT_I2S and
252 * SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified
253 * data for playback only, but ASoC currently does not support different
254 * formats for playback vs. record.
256 static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai,
259 struct snd_soc_codec *codec = codec_dai->codec;
260 struct cs4270_private *cs4270 = codec->private_data;
264 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
265 case SND_SOC_DAIFMT_I2S:
266 case SND_SOC_DAIFMT_LEFT_J:
267 cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
270 dev_err(codec->dev, "invalid dai format\n");
274 /* set master/slave audio interface */
275 switch (format & SND_SOC_DAIFMT_MASTER_MASK) {
276 case SND_SOC_DAIFMT_CBS_CFS:
277 cs4270->slave_mode = 1;
279 case SND_SOC_DAIFMT_CBM_CFM:
280 cs4270->slave_mode = 0;
283 /* all other modes are unsupported by the hardware */
291 * cs4270_fill_cache - pre-fill the CS4270 register cache.
292 * @codec: the codec for this CS4270
294 * This function fills in the CS4270 register cache by reading the register
295 * values from the hardware.
297 * This CS4270 registers are cached to avoid excessive I2C I/O operations.
298 * After the initial read to pre-fill the cache, the CS4270 never updates
299 * the register values, so we won't have a cache coherency problem.
301 * We use the auto-increment feature of the CS4270 to read all registers in
304 static int cs4270_fill_cache(struct snd_soc_codec *codec)
306 u8 *cache = codec->reg_cache;
307 struct i2c_client *i2c_client = codec->control_data;
310 length = i2c_smbus_read_i2c_block_data(i2c_client,
311 CS4270_FIRSTREG | CS4270_I2C_INCR, CS4270_NUMREGS, cache);
313 if (length != CS4270_NUMREGS) {
314 dev_err(codec->dev, "i2c read failure, addr=0x%x\n",
323 * cs4270_read_reg_cache - read from the CS4270 register cache.
324 * @codec: the codec for this CS4270
325 * @reg: the register to read
327 * This function returns the value for a given register. It reads only from
328 * the register cache, not the hardware itself.
330 * This CS4270 registers are cached to avoid excessive I2C I/O operations.
331 * After the initial read to pre-fill the cache, the CS4270 never updates
332 * the register values, so we won't have a cache coherency problem.
334 static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec,
337 u8 *cache = codec->reg_cache;
339 if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
342 return cache[reg - CS4270_FIRSTREG];
346 * cs4270_i2c_write - write to a CS4270 register via the I2C bus.
347 * @codec: the codec for this CS4270
348 * @reg: the register to write
349 * @value: the value to write to the register
351 * This function writes the given value to the given CS4270 register, and
352 * also updates the register cache.
354 * Note that we don't use the hw_write function pointer of snd_soc_codec.
355 * That's because it's too clunky: the hw_write_t prototype does not match
356 * i2c_smbus_write_byte_data(), and it's just another layer of overhead.
358 static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg,
361 u8 *cache = codec->reg_cache;
363 if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
366 /* Only perform an I2C operation if the new value is different */
367 if (cache[reg - CS4270_FIRSTREG] != value) {
368 struct i2c_client *client = codec->control_data;
369 if (i2c_smbus_write_byte_data(client, reg, value)) {
370 dev_err(codec->dev, "i2c write failed\n");
374 /* We've written to the hardware, so update the cache */
375 cache[reg - CS4270_FIRSTREG] = value;
382 * cs4270_hw_params - program the CS4270 with the given hardware parameters.
383 * @substream: the audio stream
384 * @params: the hardware parameters to set
385 * @dai: the SOC DAI (ignored)
387 * This function programs the hardware with the values provided.
388 * Specifically, the sample rate and the data format.
390 * The .ops functions are used to provide board-specific data, like input
391 * frequencies, to this driver. This function takes that information,
392 * combines it with the hardware parameters provided, and programs the
393 * hardware accordingly.
395 static int cs4270_hw_params(struct snd_pcm_substream *substream,
396 struct snd_pcm_hw_params *params,
397 struct snd_soc_dai *dai)
399 struct snd_soc_pcm_runtime *rtd = substream->private_data;
400 struct snd_soc_device *socdev = rtd->socdev;
401 struct snd_soc_codec *codec = socdev->card->codec;
402 struct cs4270_private *cs4270 = codec->private_data;
409 /* Figure out which MCLK/LRCK ratio to use */
411 rate = params_rate(params); /* Sampling rate, in Hz */
412 ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */
414 for (i = 0; i < NUM_MCLK_RATIOS; i++) {
415 if (cs4270_mode_ratios[i].ratio == ratio)
419 if (i == NUM_MCLK_RATIOS) {
420 /* We did not find a matching ratio */
421 dev_err(codec->dev, "could not find matching ratio\n");
425 /* Set the sample rate */
427 reg = snd_soc_read(codec, CS4270_MODE);
428 reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK);
429 reg |= cs4270_mode_ratios[i].mclk;
431 if (cs4270->slave_mode)
432 reg |= CS4270_MODE_SLAVE;
434 reg |= cs4270_mode_ratios[i].speed_mode;
436 ret = snd_soc_write(codec, CS4270_MODE, reg);
438 dev_err(codec->dev, "i2c write failed\n");
442 /* Set the DAI format */
444 reg = snd_soc_read(codec, CS4270_FORMAT);
445 reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK);
447 switch (cs4270->mode) {
448 case SND_SOC_DAIFMT_I2S:
449 reg |= CS4270_FORMAT_DAC_I2S | CS4270_FORMAT_ADC_I2S;
451 case SND_SOC_DAIFMT_LEFT_J:
452 reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ;
455 dev_err(codec->dev, "unknown dai format\n");
459 ret = snd_soc_write(codec, CS4270_FORMAT, reg);
461 dev_err(codec->dev, "i2c write failed\n");
469 * cs4270_dai_mute - enable/disable the CS4270 external mute
471 * @mute: 0 = disable mute, 1 = enable mute
473 * This function toggles the mute bits in the MUTE register. The CS4270's
474 * mute capability is intended for external muting circuitry, so if the
475 * board does not have the MUTEA or MUTEB pins connected to such circuitry,
476 * then this function will do nothing.
478 static int cs4270_dai_mute(struct snd_soc_dai *dai, int mute)
480 struct snd_soc_codec *codec = dai->codec;
481 struct cs4270_private *cs4270 = codec->private_data;
484 reg6 = snd_soc_read(codec, CS4270_MUTE);
487 reg6 |= CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B;
489 reg6 &= ~(CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B);
490 reg6 |= cs4270->manual_mute;
493 return snd_soc_write(codec, CS4270_MUTE, reg6);
497 * cs4270_soc_put_mute - put callback for the 'Master Playback switch'
499 * @kcontrol: mixer control
500 * @ucontrol: control element information
502 * This function basically passes the arguments on to the generic
503 * snd_soc_put_volsw() function and saves the mute information in
504 * our private data structure. This is because we want to prevent
505 * cs4270_dai_mute() neglecting the user's decision to manually
506 * mute the codec's output.
508 * Returns 0 for success.
510 static int cs4270_soc_put_mute(struct snd_kcontrol *kcontrol,
511 struct snd_ctl_elem_value *ucontrol)
513 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
514 struct cs4270_private *cs4270 = codec->private_data;
515 int left = !ucontrol->value.integer.value[0];
516 int right = !ucontrol->value.integer.value[1];
518 cs4270->manual_mute = (left ? CS4270_MUTE_DAC_A : 0) |
519 (right ? CS4270_MUTE_DAC_B : 0);
521 return snd_soc_put_volsw(kcontrol, ucontrol);
524 /* A list of non-DAPM controls that the CS4270 supports */
525 static const struct snd_kcontrol_new cs4270_snd_controls[] = {
526 SOC_DOUBLE_R("Master Playback Volume",
527 CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 1),
528 SOC_SINGLE("Digital Sidetone Switch", CS4270_FORMAT, 5, 1, 0),
529 SOC_SINGLE("Soft Ramp Switch", CS4270_TRANS, 6, 1, 0),
530 SOC_SINGLE("Zero Cross Switch", CS4270_TRANS, 5, 1, 0),
531 SOC_SINGLE("De-emphasis filter", CS4270_TRANS, 0, 1, 0),
532 SOC_SINGLE("Popguard Switch", CS4270_MODE, 0, 1, 1),
533 SOC_SINGLE("Auto-Mute Switch", CS4270_MUTE, 5, 1, 0),
534 SOC_DOUBLE("Master Capture Switch", CS4270_MUTE, 3, 4, 1, 1),
535 SOC_DOUBLE_EXT("Master Playback Switch", CS4270_MUTE, 0, 1, 1, 1,
536 snd_soc_get_volsw, cs4270_soc_put_mute),
540 * cs4270_codec - global variable to store codec for the ASoC probe function
542 * If struct i2c_driver had a private_data field, we wouldn't need to use
543 * cs4270_codec. This is the only way to pass the codec structure from
544 * cs4270_i2c_probe() to cs4270_probe(). Unfortunately, there is no good
545 * way to synchronize these two functions. cs4270_i2c_probe() can be called
546 * multiple times before cs4270_probe() is called even once. So for now, we
547 * also only allow cs4270_i2c_probe() to be run once. That means that we do
548 * not support more than one cs4270 device in the system, at least for now.
550 static struct snd_soc_codec *cs4270_codec;
552 static struct snd_soc_dai_ops cs4270_dai_ops = {
553 .hw_params = cs4270_hw_params,
554 .set_sysclk = cs4270_set_dai_sysclk,
555 .set_fmt = cs4270_set_dai_fmt,
556 .digital_mute = cs4270_dai_mute,
559 struct snd_soc_dai cs4270_dai = {
562 .stream_name = "Playback",
566 .formats = CS4270_FORMATS,
569 .stream_name = "Capture",
573 .formats = CS4270_FORMATS,
575 .ops = &cs4270_dai_ops,
577 EXPORT_SYMBOL_GPL(cs4270_dai);
580 * cs4270_probe - ASoC probe function
581 * @pdev: platform device
583 * This function is called when ASoC has all the pieces it needs to
584 * instantiate a sound driver.
586 static int cs4270_probe(struct platform_device *pdev)
588 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
589 struct snd_soc_codec *codec = cs4270_codec;
590 struct cs4270_private *cs4270 = codec->private_data;
593 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */
594 socdev->card->codec = codec;
597 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
599 dev_err(codec->dev, "failed to create pcms\n");
603 /* Add the non-DAPM controls */
604 ret = snd_soc_add_controls(codec, cs4270_snd_controls,
605 ARRAY_SIZE(cs4270_snd_controls));
607 dev_err(codec->dev, "failed to add controls\n");
608 goto error_free_pcms;
611 /* get the power supply regulators */
612 for (i = 0; i < ARRAY_SIZE(supply_names); i++)
613 cs4270->supplies[i].supply = supply_names[i];
615 ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(cs4270->supplies),
618 goto error_free_pcms;
623 snd_soc_free_pcms(socdev);
629 * cs4270_remove - ASoC remove function
630 * @pdev: platform device
632 * This function is the counterpart to cs4270_probe().
634 static int cs4270_remove(struct platform_device *pdev)
636 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
637 struct snd_soc_codec *codec = cs4270_codec;
638 struct cs4270_private *cs4270 = codec->private_data;
640 snd_soc_free_pcms(socdev);
641 regulator_bulk_free(ARRAY_SIZE(cs4270->supplies), cs4270->supplies);
647 * cs4270_i2c_probe - initialize the I2C interface of the CS4270
648 * @i2c_client: the I2C client object
649 * @id: the I2C device ID (ignored)
651 * This function is called whenever the I2C subsystem finds a device that
652 * matches the device ID given via a prior call to i2c_add_driver().
654 static int cs4270_i2c_probe(struct i2c_client *i2c_client,
655 const struct i2c_device_id *id)
657 struct snd_soc_codec *codec;
658 struct cs4270_private *cs4270;
662 /* For now, we only support one cs4270 device in the system. See the
663 * comment for cs4270_codec.
666 dev_err(&i2c_client->dev, "ignoring CS4270 at addr %X\n",
668 dev_err(&i2c_client->dev, "only one per board allowed\n");
669 /* Should we return something other than ENODEV here? */
673 /* Verify that we have a CS4270 */
675 ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID);
677 dev_err(&i2c_client->dev, "failed to read i2c at addr %X\n",
681 /* The top four bits of the chip ID should be 1100. */
682 if ((ret & 0xF0) != 0xC0) {
683 dev_err(&i2c_client->dev, "device at addr %X is not a CS4270\n",
688 dev_info(&i2c_client->dev, "found device at i2c address %X\n",
690 dev_info(&i2c_client->dev, "hardware revision %X\n", ret & 0xF);
692 /* Allocate enough space for the snd_soc_codec structure
693 and our private data together. */
694 cs4270 = kzalloc(sizeof(struct cs4270_private), GFP_KERNEL);
696 dev_err(&i2c_client->dev, "could not allocate codec\n");
699 codec = &cs4270->codec;
701 mutex_init(&codec->mutex);
702 INIT_LIST_HEAD(&codec->dapm_widgets);
703 INIT_LIST_HEAD(&codec->dapm_paths);
705 codec->dev = &i2c_client->dev;
706 codec->name = "CS4270";
707 codec->owner = THIS_MODULE;
708 codec->dai = &cs4270_dai;
710 codec->private_data = cs4270;
711 codec->control_data = i2c_client;
712 codec->read = cs4270_read_reg_cache;
713 codec->write = cs4270_i2c_write;
714 codec->reg_cache = cs4270->reg_cache;
715 codec->reg_cache_size = CS4270_NUMREGS;
717 /* The I2C interface is set up, so pre-fill our register cache */
719 ret = cs4270_fill_cache(codec);
721 dev_err(&i2c_client->dev, "failed to fill register cache\n");
722 goto error_free_codec;
725 /* Disable auto-mute. This feature appears to be buggy. In some
726 * situations, auto-mute will not deactivate when it should, so we want
727 * this feature disabled by default. An application (e.g. alsactl) can
728 * re-enabled it by using the controls.
731 reg = cs4270_read_reg_cache(codec, CS4270_MUTE);
732 reg &= ~CS4270_MUTE_AUTO;
733 ret = cs4270_i2c_write(codec, CS4270_MUTE, reg);
735 dev_err(&i2c_client->dev, "i2c write failed\n");
739 /* Disable automatic volume control. The hardware enables, and it
740 * causes volume change commands to be delayed, sometimes until after
741 * playback has started. An application (e.g. alsactl) can
742 * re-enabled it by using the controls.
745 reg = cs4270_read_reg_cache(codec, CS4270_TRANS);
746 reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO);
747 ret = cs4270_i2c_write(codec, CS4270_TRANS, reg);
749 dev_err(&i2c_client->dev, "i2c write failed\n");
753 /* Initialize the DAI. Normally, we'd prefer to have a kmalloc'd DAI
754 * structure for each CS4270 device, but the machine driver needs to
755 * have a pointer to the DAI structure, so for now it must be a global
758 cs4270_dai.dev = &i2c_client->dev;
760 /* Register the DAI. If all the other ASoC driver have already
761 * registered, then this will call our probe function, so
762 * cs4270_codec needs to be ready.
764 cs4270_codec = codec;
765 ret = snd_soc_register_dai(&cs4270_dai);
767 dev_err(&i2c_client->dev, "failed to register DAIe\n");
768 goto error_free_codec;
771 i2c_set_clientdata(i2c_client, cs4270);
778 cs4270_dai.dev = NULL;
784 * cs4270_i2c_remove - remove an I2C device
785 * @i2c_client: the I2C client object
787 * This function is the counterpart to cs4270_i2c_probe().
789 static int cs4270_i2c_remove(struct i2c_client *i2c_client)
791 struct cs4270_private *cs4270 = i2c_get_clientdata(i2c_client);
795 cs4270_dai.dev = NULL;
801 * cs4270_id - I2C device IDs supported by this driver
803 static struct i2c_device_id cs4270_id[] = {
807 MODULE_DEVICE_TABLE(i2c, cs4270_id);
811 /* This suspend/resume implementation can handle both - a simple standby
812 * where the codec remains powered, and a full suspend, where the voltage
813 * domain the codec is connected to is teared down and/or any other hardware
814 * reset condition is asserted.
816 * The codec's own power saving features are enabled in the suspend callback,
817 * and all registers are written back to the hardware when resuming.
820 static int cs4270_soc_suspend(struct platform_device *pdev, pm_message_t mesg)
822 struct snd_soc_codec *codec = cs4270_codec;
823 struct cs4270_private *cs4270 = codec->private_data;
826 reg = snd_soc_read(codec, CS4270_PWRCTL) | CS4270_PWRCTL_PDN_ALL;
830 ret = snd_soc_write(codec, CS4270_PWRCTL, reg);
834 regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies),
840 static int cs4270_soc_resume(struct platform_device *pdev)
842 struct snd_soc_codec *codec = cs4270_codec;
843 struct cs4270_private *cs4270 = codec->private_data;
844 struct i2c_client *i2c_client = codec->control_data;
847 regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies),
850 /* In case the device was put to hard reset during sleep, we need to
851 * wait 500ns here before any I2C communication. */
854 /* first restore the entire register cache ... */
855 for (reg = CS4270_FIRSTREG; reg <= CS4270_LASTREG; reg++) {
856 u8 val = snd_soc_read(codec, reg);
858 if (i2c_smbus_write_byte_data(i2c_client, reg, val)) {
859 dev_err(codec->dev, "i2c write failed\n");
864 /* ... then disable the power-down bits */
865 reg = snd_soc_read(codec, CS4270_PWRCTL);
866 reg &= ~CS4270_PWRCTL_PDN_ALL;
868 return snd_soc_write(codec, CS4270_PWRCTL, reg);
871 #define cs4270_soc_suspend NULL
872 #define cs4270_soc_resume NULL
873 #endif /* CONFIG_PM */
876 * cs4270_i2c_driver - I2C device identification
878 * This structure tells the I2C subsystem how to identify and support a
879 * given I2C device type.
881 static struct i2c_driver cs4270_i2c_driver = {
884 .owner = THIS_MODULE,
886 .id_table = cs4270_id,
887 .probe = cs4270_i2c_probe,
888 .remove = cs4270_i2c_remove,
892 * ASoC codec device structure
894 * Assign this variable to the codec_dev field of the machine driver's
895 * snd_soc_device structure.
897 struct snd_soc_codec_device soc_codec_device_cs4270 = {
898 .probe = cs4270_probe,
899 .remove = cs4270_remove,
900 .suspend = cs4270_soc_suspend,
901 .resume = cs4270_soc_resume,
903 EXPORT_SYMBOL_GPL(soc_codec_device_cs4270);
905 static int __init cs4270_init(void)
907 pr_info("Cirrus Logic CS4270 ALSA SoC Codec Driver\n");
909 return i2c_add_driver(&cs4270_i2c_driver);
911 module_init(cs4270_init);
913 static void __exit cs4270_exit(void)
915 i2c_del_driver(&cs4270_i2c_driver);
917 module_exit(cs4270_exit);
919 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
920 MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver");
921 MODULE_LICENSE("GPL");