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b0c813ce TT |
1 | /* |
2 | * CS4270 ALSA SoC (ASoC) codec driver | |
3 | * | |
4 | * Author: Timur Tabi <timur@freescale.com> | |
5 | * | |
6 | * Copyright 2007 Freescale Semiconductor, Inc. This file is licensed under | |
7 | * the terms of the GNU General Public License version 2. This program | |
8 | * is licensed "as is" without any warranty of any kind, whether express | |
9 | * or implied. | |
10 | * | |
11 | * This is an ASoC device driver for the Cirrus Logic CS4270 codec. | |
12 | * | |
13 | * Current features/limitations: | |
14 | * | |
9dbd627b TT |
15 | * 1) Software mode is supported. Stand-alone mode is automatically |
16 | * selected if I2C is disabled or if a CS4270 is not found on the I2C | |
17 | * bus. However, stand-alone mode is only partially implemented because | |
18 | * there is no mechanism yet for this driver and the machine driver to | |
19 | * communicate the values of the M0, M1, MCLK1, and MCLK2 pins. | |
b0c813ce TT |
20 | * 2) Only I2C is supported, not SPI |
21 | * 3) Only Master mode is supported, not Slave. | |
22 | * 4) The machine driver's 'startup' function must call | |
23 | * cs4270_set_dai_sysclk() with the value of MCLK. | |
24 | * 5) Only I2S and left-justified modes are supported | |
25 | * 6) Power management is not supported | |
26 | * 7) The only supported control is volume and hardware mute (if enabled) | |
27 | */ | |
28 | ||
29 | #include <linux/module.h> | |
30 | #include <linux/platform_device.h> | |
b0c813ce TT |
31 | #include <sound/core.h> |
32 | #include <sound/soc.h> | |
33 | #include <sound/initval.h> | |
34 | #include <linux/i2c.h> | |
35 | ||
36 | #include "cs4270.h" | |
37 | ||
9dbd627b TT |
38 | /* If I2C is defined, then we support software mode. However, if we're |
39 | not compiled as module but I2C is, then we can't use I2C calls. */ | |
40 | #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) | |
41 | #define USE_I2C | |
42 | #endif | |
43 | ||
b0c813ce TT |
44 | /* Private data for the CS4270 */ |
45 | struct cs4270_private { | |
46 | unsigned int mclk; /* Input frequency of the MCLK pin */ | |
47 | unsigned int mode; /* The mode (I2S or left-justified) */ | |
48 | }; | |
49 | ||
8432395f TT |
50 | /* |
51 | * The codec isn't really big-endian or little-endian, since the I2S | |
52 | * interface requires data to be sent serially with the MSbit first. | |
53 | * However, to support BE and LE I2S devices, we specify both here. That | |
54 | * way, ALSA will always match the bit patterns. | |
55 | */ | |
56 | #define CS4270_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ | |
57 | SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \ | |
58 | SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \ | |
59 | SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \ | |
60 | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \ | |
61 | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE) | |
62 | ||
63 | #ifdef USE_I2C | |
64 | ||
65 | /* CS4270 registers addresses */ | |
66 | #define CS4270_CHIPID 0x01 /* Chip ID */ | |
67 | #define CS4270_PWRCTL 0x02 /* Power Control */ | |
68 | #define CS4270_MODE 0x03 /* Mode Control */ | |
69 | #define CS4270_FORMAT 0x04 /* Serial Format, ADC/DAC Control */ | |
70 | #define CS4270_TRANS 0x05 /* Transition Control */ | |
71 | #define CS4270_MUTE 0x06 /* Mute Control */ | |
72 | #define CS4270_VOLA 0x07 /* DAC Channel A Volume Control */ | |
73 | #define CS4270_VOLB 0x08 /* DAC Channel B Volume Control */ | |
74 | ||
75 | #define CS4270_FIRSTREG 0x01 | |
76 | #define CS4270_LASTREG 0x08 | |
77 | #define CS4270_NUMREGS (CS4270_LASTREG - CS4270_FIRSTREG + 1) | |
9dbd627b | 78 | |
8432395f TT |
79 | /* Bit masks for the CS4270 registers */ |
80 | #define CS4270_CHIPID_ID 0xF0 | |
81 | #define CS4270_CHIPID_REV 0x0F | |
82 | #define CS4270_PWRCTL_FREEZE 0x80 | |
83 | #define CS4270_PWRCTL_PDN_ADC 0x20 | |
84 | #define CS4270_PWRCTL_PDN_DAC 0x02 | |
85 | #define CS4270_PWRCTL_PDN 0x01 | |
86 | #define CS4270_MODE_SPEED_MASK 0x30 | |
87 | #define CS4270_MODE_1X 0x00 | |
88 | #define CS4270_MODE_2X 0x10 | |
89 | #define CS4270_MODE_4X 0x20 | |
90 | #define CS4270_MODE_SLAVE 0x30 | |
91 | #define CS4270_MODE_DIV_MASK 0x0E | |
92 | #define CS4270_MODE_DIV1 0x00 | |
93 | #define CS4270_MODE_DIV15 0x02 | |
94 | #define CS4270_MODE_DIV2 0x04 | |
95 | #define CS4270_MODE_DIV3 0x06 | |
96 | #define CS4270_MODE_DIV4 0x08 | |
97 | #define CS4270_MODE_POPGUARD 0x01 | |
98 | #define CS4270_FORMAT_FREEZE_A 0x80 | |
99 | #define CS4270_FORMAT_FREEZE_B 0x40 | |
100 | #define CS4270_FORMAT_LOOPBACK 0x20 | |
101 | #define CS4270_FORMAT_DAC_MASK 0x18 | |
102 | #define CS4270_FORMAT_DAC_LJ 0x00 | |
103 | #define CS4270_FORMAT_DAC_I2S 0x08 | |
104 | #define CS4270_FORMAT_DAC_RJ16 0x18 | |
105 | #define CS4270_FORMAT_DAC_RJ24 0x10 | |
106 | #define CS4270_FORMAT_ADC_MASK 0x01 | |
107 | #define CS4270_FORMAT_ADC_LJ 0x00 | |
108 | #define CS4270_FORMAT_ADC_I2S 0x01 | |
109 | #define CS4270_TRANS_ONE_VOL 0x80 | |
110 | #define CS4270_TRANS_SOFT 0x40 | |
111 | #define CS4270_TRANS_ZERO 0x20 | |
112 | #define CS4270_TRANS_INV_ADC_A 0x08 | |
113 | #define CS4270_TRANS_INV_ADC_B 0x10 | |
114 | #define CS4270_TRANS_INV_DAC_A 0x02 | |
115 | #define CS4270_TRANS_INV_DAC_B 0x04 | |
116 | #define CS4270_TRANS_DEEMPH 0x01 | |
117 | #define CS4270_MUTE_AUTO 0x20 | |
118 | #define CS4270_MUTE_ADC_A 0x08 | |
119 | #define CS4270_MUTE_ADC_B 0x10 | |
120 | #define CS4270_MUTE_POLARITY 0x04 | |
121 | #define CS4270_MUTE_DAC_A 0x01 | |
122 | #define CS4270_MUTE_DAC_B 0x02 | |
123 | ||
124 | /* | |
125 | * Clock Ratio Selection for Master Mode with I2C enabled | |
126 | * | |
127 | * The data for this chart is taken from Table 5 of the CS4270 reference | |
128 | * manual. | |
129 | * | |
130 | * This table is used to determine how to program the Mode Control register. | |
131 | * It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling | |
132 | * rates the CS4270 currently supports. | |
133 | * | |
134 | * Each element in this array corresponds to the ratios in mclk_ratios[]. | |
135 | * These two arrays need to be in sync. | |
136 | * | |
137 | * 'speed_mode' is the corresponding bit pattern to be written to the | |
138 | * MODE bits of the Mode Control Register | |
139 | * | |
140 | * 'mclk' is the corresponding bit pattern to be wirten to the MCLK bits of | |
141 | * the Mode Control Register. | |
142 | * | |
143 | * In situations where a single ratio is represented by multiple speed | |
144 | * modes, we favor the slowest speed. E.g, for a ratio of 128, we pick | |
145 | * double-speed instead of quad-speed. However, the CS4270 errata states | |
146 | * that Divide-By-1.5 can cause failures, so we avoid that mode where | |
147 | * possible. | |
148 | * | |
149 | * ERRATA: There is an errata for the CS4270 where divide-by-1.5 does not | |
150 | * work if VD = 3.3V. If this effects you, select the | |
151 | * CONFIG_SND_SOC_CS4270_VD33_ERRATA Kconfig option, and the driver will | |
152 | * never select any sample rates that require divide-by-1.5. | |
153 | */ | |
154 | static struct { | |
155 | unsigned int ratio; | |
156 | u8 speed_mode; | |
157 | u8 mclk; | |
158 | } cs4270_mode_ratios[] = { | |
159 | {64, CS4270_MODE_4X, CS4270_MODE_DIV1}, | |
160 | #ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA | |
161 | {96, CS4270_MODE_4X, CS4270_MODE_DIV15}, | |
162 | #endif | |
163 | {128, CS4270_MODE_2X, CS4270_MODE_DIV1}, | |
164 | {192, CS4270_MODE_4X, CS4270_MODE_DIV3}, | |
165 | {256, CS4270_MODE_1X, CS4270_MODE_DIV1}, | |
166 | {384, CS4270_MODE_2X, CS4270_MODE_DIV3}, | |
167 | {512, CS4270_MODE_1X, CS4270_MODE_DIV2}, | |
168 | {768, CS4270_MODE_1X, CS4270_MODE_DIV3}, | |
169 | {1024, CS4270_MODE_1X, CS4270_MODE_DIV4} | |
170 | }; | |
171 | ||
172 | /* The number of MCLK/LRCK ratios supported by the CS4270 */ | |
173 | #define NUM_MCLK_RATIOS ARRAY_SIZE(cs4270_mode_ratios) | |
9dbd627b | 174 | |
9dbd627b TT |
175 | /* |
176 | * Determine the CS4270 samples rates. | |
177 | * | |
178 | * 'freq' is the input frequency to MCLK. The other parameters are ignored. | |
179 | * | |
180 | * The value of MCLK is used to determine which sample rates are supported | |
181 | * by the CS4270. The ratio of MCLK / Fs must be equal to one of nine | |
182 | * support values: 64, 96, 128, 192, 256, 384, 512, 768, and 1024. | |
183 | * | |
184 | * This function calculates the nine ratios and determines which ones match | |
185 | * a standard sample rate. If there's a match, then it is added to the list | |
186 | * of support sample rates. | |
187 | * | |
188 | * This function must be called by the machine driver's 'startup' function, | |
189 | * otherwise the list of supported sample rates will not be available in | |
190 | * time for ALSA. | |
191 | * | |
192 | * Note that in stand-alone mode, the sample rate is determined by input | |
193 | * pins M0, M1, MDIV1, and MDIV2. Also in stand-alone mode, divide-by-3 | |
194 | * is not a programmable option. However, divide-by-3 is not an available | |
195 | * option in stand-alone mode. This cases two problems: a ratio of 768 is | |
196 | * not available (it requires divide-by-3) and B) ratios 192 and 384 can | |
197 | * only be selected with divide-by-1.5, but there is an errate that make | |
198 | * this selection difficult. | |
199 | * | |
200 | * In addition, there is no mechanism for communicating with the machine | |
201 | * driver what the input settings can be. This would need to be implemented | |
202 | * for stand-alone mode to work. | |
203 | */ | |
e550e17f | 204 | static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai, |
9dbd627b TT |
205 | int clk_id, unsigned int freq, int dir) |
206 | { | |
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; | |
212 | unsigned int i; | |
213 | ||
214 | cs4270->mclk = freq; | |
215 | ||
216 | for (i = 0; i < NUM_MCLK_RATIOS; i++) { | |
8432395f | 217 | unsigned int rate = freq / cs4270_mode_ratios[i].ratio; |
918f3a0e CL |
218 | rates |= snd_pcm_rate_to_rate_bit(rate); |
219 | if (rate < rate_min) | |
220 | rate_min = rate; | |
221 | if (rate > rate_max) | |
222 | rate_max = rate; | |
9dbd627b | 223 | } |
918f3a0e CL |
224 | /* FIXME: soc should support a rate list */ |
225 | rates &= ~SNDRV_PCM_RATE_KNOT; | |
9dbd627b TT |
226 | |
227 | if (!rates) { | |
228 | printk(KERN_ERR "cs4270: could not find a valid sample rate\n"); | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
232 | codec_dai->playback.rates = rates; | |
233 | codec_dai->playback.rate_min = rate_min; | |
234 | codec_dai->playback.rate_max = rate_max; | |
235 | ||
236 | codec_dai->capture.rates = rates; | |
237 | codec_dai->capture.rate_min = rate_min; | |
238 | codec_dai->capture.rate_max = rate_max; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Configure the codec for the selected audio format | |
245 | * | |
246 | * This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the | |
247 | * codec accordingly. | |
248 | * | |
249 | * Currently, this function only supports SND_SOC_DAIFMT_I2S and | |
250 | * SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified | |
251 | * data for playback only, but ASoC currently does not support different | |
252 | * formats for playback vs. record. | |
253 | */ | |
e550e17f | 254 | static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai, |
9dbd627b TT |
255 | unsigned int format) |
256 | { | |
257 | struct snd_soc_codec *codec = codec_dai->codec; | |
258 | struct cs4270_private *cs4270 = codec->private_data; | |
259 | int ret = 0; | |
260 | ||
261 | switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { | |
262 | case SND_SOC_DAIFMT_I2S: | |
263 | case SND_SOC_DAIFMT_LEFT_J: | |
264 | cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK; | |
265 | break; | |
266 | default: | |
267 | printk(KERN_ERR "cs4270: invalid DAI format\n"); | |
268 | ret = -EINVAL; | |
269 | } | |
270 | ||
271 | return ret; | |
272 | } | |
273 | ||
b0c813ce TT |
274 | /* |
275 | * A list of addresses on which this CS4270 could use. I2C addresses are | |
276 | * 7 bits. For the CS4270, the upper four bits are always 1001, and the | |
277 | * lower three bits are determined via the AD2, AD1, and AD0 pins | |
278 | * (respectively). | |
279 | */ | |
2cdddeb8 | 280 | static const unsigned short normal_i2c[] = { |
b0c813ce TT |
281 | 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, I2C_CLIENT_END |
282 | }; | |
283 | I2C_CLIENT_INSMOD; | |
284 | ||
285 | /* | |
286 | * Pre-fill the CS4270 register cache. | |
287 | * | |
288 | * We use the auto-increment feature of the CS4270 to read all registers in | |
289 | * one shot. | |
290 | */ | |
291 | static int cs4270_fill_cache(struct snd_soc_codec *codec) | |
292 | { | |
293 | u8 *cache = codec->reg_cache; | |
294 | struct i2c_client *i2c_client = codec->control_data; | |
295 | s32 length; | |
296 | ||
297 | length = i2c_smbus_read_i2c_block_data(i2c_client, | |
298 | CS4270_FIRSTREG | 0x80, CS4270_NUMREGS, cache); | |
299 | ||
300 | if (length != CS4270_NUMREGS) { | |
9dbd627b | 301 | printk(KERN_ERR "cs4270: I2C read failure, addr=0x%x\n", |
b0c813ce TT |
302 | i2c_client->addr); |
303 | return -EIO; | |
304 | } | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Read from the CS4270 register cache. | |
311 | * | |
312 | * This CS4270 registers are cached to avoid excessive I2C I/O operations. | |
313 | * After the initial read to pre-fill the cache, the CS4270 never updates | |
314 | * the register values, so we won't have a cache coherncy problem. | |
315 | */ | |
316 | static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec, | |
317 | unsigned int reg) | |
318 | { | |
319 | u8 *cache = codec->reg_cache; | |
320 | ||
321 | if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) | |
322 | return -EIO; | |
323 | ||
324 | return cache[reg - CS4270_FIRSTREG]; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Write to a CS4270 register via the I2C bus. | |
329 | * | |
330 | * This function writes the given value to the given CS4270 register, and | |
331 | * also updates the register cache. | |
332 | * | |
333 | * Note that we don't use the hw_write function pointer of snd_soc_codec. | |
334 | * That's because it's too clunky: the hw_write_t prototype does not match | |
335 | * i2c_smbus_write_byte_data(), and it's just another layer of overhead. | |
336 | */ | |
337 | static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg, | |
338 | unsigned int value) | |
339 | { | |
bfc4e861 TT |
340 | u8 *cache = codec->reg_cache; |
341 | ||
b0c813ce TT |
342 | if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) |
343 | return -EIO; | |
344 | ||
bfc4e861 TT |
345 | /* Only perform an I2C operation if the new value is different */ |
346 | if (cache[reg - CS4270_FIRSTREG] != value) { | |
347 | struct i2c_client *client = codec->control_data; | |
348 | if (i2c_smbus_write_byte_data(client, reg, value)) { | |
349 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
350 | return -EIO; | |
351 | } | |
352 | ||
b0c813ce | 353 | /* We've written to the hardware, so update the cache */ |
b0c813ce | 354 | cache[reg - CS4270_FIRSTREG] = value; |
b0c813ce | 355 | } |
bfc4e861 TT |
356 | |
357 | return 0; | |
b0c813ce TT |
358 | } |
359 | ||
b0c813ce TT |
360 | /* |
361 | * Program the CS4270 with the given hardware parameters. | |
362 | * | |
dee89c4d | 363 | * The .ops functions are used to provide board-specific data, like |
b0c813ce TT |
364 | * input frequencies, to this driver. This function takes that information, |
365 | * combines it with the hardware parameters provided, and programs the | |
366 | * hardware accordingly. | |
367 | */ | |
368 | static int cs4270_hw_params(struct snd_pcm_substream *substream, | |
dee89c4d MB |
369 | struct snd_pcm_hw_params *params, |
370 | struct snd_soc_dai *dai) | |
b0c813ce TT |
371 | { |
372 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
373 | struct snd_soc_device *socdev = rtd->socdev; | |
374 | struct snd_soc_codec *codec = socdev->codec; | |
375 | struct cs4270_private *cs4270 = codec->private_data; | |
e34ba212 | 376 | int ret; |
b0c813ce TT |
377 | unsigned int i; |
378 | unsigned int rate; | |
379 | unsigned int ratio; | |
380 | int reg; | |
381 | ||
382 | /* Figure out which MCLK/LRCK ratio to use */ | |
383 | ||
384 | rate = params_rate(params); /* Sampling rate, in Hz */ | |
385 | ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */ | |
386 | ||
9dbd627b | 387 | for (i = 0; i < NUM_MCLK_RATIOS; i++) { |
8432395f | 388 | if (cs4270_mode_ratios[i].ratio == ratio) |
b0c813ce TT |
389 | break; |
390 | } | |
391 | ||
9dbd627b | 392 | if (i == NUM_MCLK_RATIOS) { |
b0c813ce TT |
393 | /* We did not find a matching ratio */ |
394 | printk(KERN_ERR "cs4270: could not find matching ratio\n"); | |
395 | return -EINVAL; | |
396 | } | |
397 | ||
398 | /* Freeze and power-down the codec */ | |
399 | ||
400 | ret = snd_soc_write(codec, CS4270_PWRCTL, CS4270_PWRCTL_FREEZE | | |
401 | CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC | | |
402 | CS4270_PWRCTL_PDN); | |
403 | if (ret < 0) { | |
404 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
405 | return ret; | |
406 | } | |
407 | ||
408 | /* Program the mode control register */ | |
409 | ||
410 | reg = snd_soc_read(codec, CS4270_MODE); | |
411 | reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK); | |
412 | reg |= cs4270_mode_ratios[i].speed_mode | cs4270_mode_ratios[i].mclk; | |
413 | ||
414 | ret = snd_soc_write(codec, CS4270_MODE, reg); | |
415 | if (ret < 0) { | |
416 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
417 | return ret; | |
418 | } | |
419 | ||
420 | /* Program the format register */ | |
421 | ||
422 | reg = snd_soc_read(codec, CS4270_FORMAT); | |
423 | reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK); | |
424 | ||
425 | switch (cs4270->mode) { | |
426 | case SND_SOC_DAIFMT_I2S: | |
427 | reg |= CS4270_FORMAT_DAC_I2S | CS4270_FORMAT_ADC_I2S; | |
428 | break; | |
429 | case SND_SOC_DAIFMT_LEFT_J: | |
430 | reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ; | |
431 | break; | |
432 | default: | |
433 | printk(KERN_ERR "cs4270: unknown format\n"); | |
434 | return -EINVAL; | |
435 | } | |
436 | ||
437 | ret = snd_soc_write(codec, CS4270_FORMAT, reg); | |
438 | if (ret < 0) { | |
439 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
440 | return ret; | |
441 | } | |
442 | ||
443 | /* Disable auto-mute. This feature appears to be buggy, because in | |
444 | some situations, auto-mute will not deactivate when it should. */ | |
445 | ||
446 | reg = snd_soc_read(codec, CS4270_MUTE); | |
447 | reg &= ~CS4270_MUTE_AUTO; | |
448 | ret = snd_soc_write(codec, CS4270_MUTE, reg); | |
449 | if (ret < 0) { | |
450 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
451 | return ret; | |
452 | } | |
453 | ||
0c235d1e TT |
454 | /* Disable automatic volume control. It's enabled by default, and |
455 | * it causes volume change commands to be delayed, sometimes until | |
456 | * after playback has started. | |
457 | */ | |
458 | ||
459 | reg = cs4270_read_reg_cache(codec, CS4270_TRANS); | |
460 | reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO); | |
461 | ret = cs4270_i2c_write(codec, CS4270_TRANS, reg); | |
462 | if (ret < 0) { | |
463 | printk(KERN_ERR "I2C write failed\n"); | |
464 | return ret; | |
465 | } | |
466 | ||
b0c813ce TT |
467 | /* Thaw and power-up the codec */ |
468 | ||
469 | ret = snd_soc_write(codec, CS4270_PWRCTL, 0); | |
470 | if (ret < 0) { | |
471 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
472 | return ret; | |
473 | } | |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
478 | #ifdef CONFIG_SND_SOC_CS4270_HWMUTE | |
479 | ||
480 | /* | |
481 | * Set the CS4270 external mute | |
482 | * | |
483 | * This function toggles the mute bits in the MUTE register. The CS4270's | |
484 | * mute capability is intended for external muting circuitry, so if the | |
485 | * board does not have the MUTEA or MUTEB pins connected to such circuitry, | |
486 | * then this function will do nothing. | |
487 | */ | |
e550e17f | 488 | static int cs4270_mute(struct snd_soc_dai *dai, int mute) |
b0c813ce TT |
489 | { |
490 | struct snd_soc_codec *codec = dai->codec; | |
491 | int reg6; | |
492 | ||
493 | reg6 = snd_soc_read(codec, CS4270_MUTE); | |
494 | ||
495 | if (mute) | |
496 | reg6 |= CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B | | |
497 | CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B; | |
498 | else | |
499 | reg6 &= ~(CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B | | |
500 | CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B); | |
501 | ||
502 | return snd_soc_write(codec, CS4270_MUTE, reg6); | |
503 | } | |
504 | ||
505 | #endif | |
506 | ||
ec2cd95f | 507 | static int cs4270_i2c_probe(struct i2c_client *, const struct i2c_device_id *); |
b0c813ce TT |
508 | |
509 | /* A list of non-DAPM controls that the CS4270 supports */ | |
510 | static const struct snd_kcontrol_new cs4270_snd_controls[] = { | |
511 | SOC_DOUBLE_R("Master Playback Volume", | |
bfc4e861 | 512 | CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 1) |
b0c813ce TT |
513 | }; |
514 | ||
ec2cd95f TT |
515 | static const struct i2c_device_id cs4270_id[] = { |
516 | {"cs4270", 0}, | |
517 | {} | |
518 | }; | |
519 | MODULE_DEVICE_TABLE(i2c, cs4270_id); | |
520 | ||
b0c813ce TT |
521 | static struct i2c_driver cs4270_i2c_driver = { |
522 | .driver = { | |
523 | .name = "CS4270 I2C", | |
524 | .owner = THIS_MODULE, | |
525 | }, | |
ec2cd95f TT |
526 | .id_table = cs4270_id, |
527 | .probe = cs4270_i2c_probe, | |
b0c813ce TT |
528 | }; |
529 | ||
530 | /* | |
531 | * Global variable to store socdev for i2c probe function. | |
532 | * | |
533 | * If struct i2c_driver had a private_data field, we wouldn't need to use | |
534 | * cs4270_socdec. This is the only way to pass the socdev structure to | |
535 | * cs4270_i2c_probe(). | |
536 | * | |
537 | * The real solution to cs4270_socdev is to create a mechanism | |
538 | * that maps I2C addresses to snd_soc_device structures. Perhaps the | |
539 | * creation of the snd_soc_device object should be moved out of | |
540 | * cs4270_probe() and into cs4270_i2c_probe(), but that would make this | |
541 | * driver dependent on I2C. The CS4270 supports "stand-alone" mode, whereby | |
542 | * the chip is *not* connected to the I2C bus, but is instead configured via | |
543 | * input pins. | |
544 | */ | |
545 | static struct snd_soc_device *cs4270_socdev; | |
546 | ||
547 | /* | |
548 | * Initialize the I2C interface of the CS4270 | |
549 | * | |
550 | * This function is called for whenever the I2C subsystem finds a device | |
551 | * at a particular address. | |
552 | * | |
553 | * Note: snd_soc_new_pcms() must be called before this function can be called, | |
554 | * because of snd_ctl_add(). | |
555 | */ | |
ec2cd95f TT |
556 | static int cs4270_i2c_probe(struct i2c_client *i2c_client, |
557 | const struct i2c_device_id *id) | |
b0c813ce TT |
558 | { |
559 | struct snd_soc_device *socdev = cs4270_socdev; | |
560 | struct snd_soc_codec *codec = socdev->codec; | |
b0c813ce TT |
561 | int i; |
562 | int ret = 0; | |
563 | ||
564 | /* Probing all possible addresses has one drawback: if there are | |
565 | multiple CS4270s on the bus, then you cannot specify which | |
566 | socdev is matched with which CS4270. For now, we just reject | |
567 | this I2C device if the socdev already has one attached. */ | |
568 | if (codec->control_data) | |
569 | return -ENODEV; | |
570 | ||
571 | /* Note: codec_dai->codec is NULL here */ | |
572 | ||
b0c813ce TT |
573 | codec->reg_cache = kzalloc(CS4270_NUMREGS, GFP_KERNEL); |
574 | if (!codec->reg_cache) { | |
575 | printk(KERN_ERR "cs4270: could not allocate register cache\n"); | |
576 | ret = -ENOMEM; | |
577 | goto error; | |
578 | } | |
579 | ||
b0c813ce TT |
580 | /* Verify that we have a CS4270 */ |
581 | ||
582 | ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID); | |
583 | if (ret < 0) { | |
584 | printk(KERN_ERR "cs4270: failed to read I2C\n"); | |
585 | goto error; | |
586 | } | |
587 | /* The top four bits of the chip ID should be 1100. */ | |
588 | if ((ret & 0xF0) != 0xC0) { | |
589 | /* The device at this address is not a CS4270 codec */ | |
590 | ret = -ENODEV; | |
591 | goto error; | |
592 | } | |
593 | ||
ec2cd95f TT |
594 | printk(KERN_INFO "cs4270: found device at I2C address %X\n", |
595 | i2c_client->addr); | |
b0c813ce TT |
596 | printk(KERN_INFO "cs4270: hardware revision %X\n", ret & 0xF); |
597 | ||
b0c813ce TT |
598 | codec->control_data = i2c_client; |
599 | codec->read = cs4270_read_reg_cache; | |
600 | codec->write = cs4270_i2c_write; | |
601 | codec->reg_cache_size = CS4270_NUMREGS; | |
602 | ||
603 | /* The I2C interface is set up, so pre-fill our register cache */ | |
604 | ||
605 | ret = cs4270_fill_cache(codec); | |
606 | if (ret < 0) { | |
607 | printk(KERN_ERR "cs4270: failed to fill register cache\n"); | |
608 | goto error; | |
609 | } | |
610 | ||
611 | /* Add the non-DAPM controls */ | |
612 | ||
613 | for (i = 0; i < ARRAY_SIZE(cs4270_snd_controls); i++) { | |
614 | struct snd_kcontrol *kctrl = | |
615 | snd_soc_cnew(&cs4270_snd_controls[i], codec, NULL); | |
616 | ||
617 | ret = snd_ctl_add(codec->card, kctrl); | |
618 | if (ret < 0) | |
619 | goto error; | |
620 | } | |
621 | ||
ec2cd95f TT |
622 | i2c_set_clientdata(i2c_client, codec); |
623 | ||
b0c813ce TT |
624 | return 0; |
625 | ||
626 | error: | |
9778e9a0 | 627 | codec->control_data = NULL; |
b0c813ce TT |
628 | |
629 | kfree(codec->reg_cache); | |
630 | codec->reg_cache = NULL; | |
631 | codec->reg_cache_size = 0; | |
632 | ||
b0c813ce TT |
633 | return ret; |
634 | } | |
635 | ||
8432395f | 636 | #endif /* USE_I2C*/ |
b0c813ce | 637 | |
e550e17f | 638 | struct snd_soc_dai cs4270_dai = { |
b0c813ce TT |
639 | .name = "CS4270", |
640 | .playback = { | |
641 | .stream_name = "Playback", | |
642 | .channels_min = 1, | |
643 | .channels_max = 2, | |
644 | .rates = 0, | |
645 | .formats = CS4270_FORMATS, | |
646 | }, | |
647 | .capture = { | |
648 | .stream_name = "Capture", | |
649 | .channels_min = 1, | |
650 | .channels_max = 2, | |
651 | .rates = 0, | |
652 | .formats = CS4270_FORMATS, | |
653 | }, | |
b0c813ce TT |
654 | }; |
655 | EXPORT_SYMBOL_GPL(cs4270_dai); | |
656 | ||
657 | /* | |
658 | * ASoC probe function | |
659 | * | |
660 | * This function is called when the machine driver calls | |
661 | * platform_device_add(). | |
662 | */ | |
663 | static int cs4270_probe(struct platform_device *pdev) | |
664 | { | |
665 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
666 | struct snd_soc_codec *codec; | |
667 | int ret = 0; | |
668 | ||
669 | printk(KERN_INFO "CS4270 ALSA SoC Codec\n"); | |
670 | ||
671 | /* Allocate enough space for the snd_soc_codec structure | |
672 | and our private data together. */ | |
673 | codec = kzalloc(ALIGN(sizeof(struct snd_soc_codec), 4) + | |
674 | sizeof(struct cs4270_private), GFP_KERNEL); | |
675 | if (!codec) { | |
676 | printk(KERN_ERR "cs4270: Could not allocate codec structure\n"); | |
677 | return -ENOMEM; | |
678 | } | |
679 | ||
680 | mutex_init(&codec->mutex); | |
681 | INIT_LIST_HEAD(&codec->dapm_widgets); | |
682 | INIT_LIST_HEAD(&codec->dapm_paths); | |
683 | ||
684 | codec->name = "CS4270"; | |
685 | codec->owner = THIS_MODULE; | |
686 | codec->dai = &cs4270_dai; | |
687 | codec->num_dai = 1; | |
4df20535 TT |
688 | codec->private_data = (void *) codec + |
689 | ALIGN(sizeof(struct snd_soc_codec), 4); | |
b0c813ce TT |
690 | |
691 | socdev->codec = codec; | |
692 | ||
693 | /* Register PCMs */ | |
694 | ||
695 | ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); | |
696 | if (ret < 0) { | |
697 | printk(KERN_ERR "cs4270: failed to create PCMs\n"); | |
e3145dfb | 698 | goto error_free_codec; |
b0c813ce TT |
699 | } |
700 | ||
9dbd627b | 701 | #ifdef USE_I2C |
b0c813ce TT |
702 | cs4270_socdev = socdev; |
703 | ||
704 | ret = i2c_add_driver(&cs4270_i2c_driver); | |
705 | if (ret) { | |
706 | printk(KERN_ERR "cs4270: failed to attach driver"); | |
e3145dfb | 707 | goto error_free_pcms; |
b0c813ce TT |
708 | } |
709 | ||
710 | /* Did we find a CS4270 on the I2C bus? */ | |
711 | if (codec->control_data) { | |
712 | /* Initialize codec ops */ | |
713 | cs4270_dai.ops.hw_params = cs4270_hw_params; | |
dee89c4d MB |
714 | cs4270_dai.ops.set_sysclk = cs4270_set_dai_sysclk; |
715 | cs4270_dai.ops.set_fmt = cs4270_set_dai_fmt; | |
b0c813ce | 716 | #ifdef CONFIG_SND_SOC_CS4270_HWMUTE |
dee89c4d | 717 | cs4270_dai.ops.digital_mute = cs4270_mute; |
b0c813ce TT |
718 | #endif |
719 | } else | |
720 | printk(KERN_INFO "cs4270: no I2C device found, " | |
721 | "using stand-alone mode\n"); | |
722 | #else | |
723 | printk(KERN_INFO "cs4270: I2C disabled, using stand-alone mode\n"); | |
724 | #endif | |
725 | ||
968a6025 | 726 | ret = snd_soc_init_card(socdev); |
b0c813ce TT |
727 | if (ret < 0) { |
728 | printk(KERN_ERR "cs4270: failed to register card\n"); | |
e3145dfb | 729 | goto error_del_driver; |
b0c813ce TT |
730 | } |
731 | ||
e3145dfb JD |
732 | return 0; |
733 | ||
734 | error_del_driver: | |
735 | #ifdef USE_I2C | |
736 | i2c_del_driver(&cs4270_i2c_driver); | |
737 | ||
738 | error_free_pcms: | |
739 | #endif | |
740 | snd_soc_free_pcms(socdev); | |
741 | ||
742 | error_free_codec: | |
743 | kfree(socdev->codec); | |
744 | socdev->codec = NULL; | |
745 | ||
b0c813ce TT |
746 | return ret; |
747 | } | |
748 | ||
749 | static int cs4270_remove(struct platform_device *pdev) | |
750 | { | |
751 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
752 | ||
753 | snd_soc_free_pcms(socdev); | |
754 | ||
9dbd627b | 755 | #ifdef USE_I2C |
e3145dfb | 756 | i2c_del_driver(&cs4270_i2c_driver); |
b0c813ce TT |
757 | #endif |
758 | ||
759 | kfree(socdev->codec); | |
760 | socdev->codec = NULL; | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
765 | /* | |
766 | * ASoC codec device structure | |
767 | * | |
768 | * Assign this variable to the codec_dev field of the machine driver's | |
769 | * snd_soc_device structure. | |
770 | */ | |
771 | struct snd_soc_codec_device soc_codec_device_cs4270 = { | |
772 | .probe = cs4270_probe, | |
773 | .remove = cs4270_remove | |
774 | }; | |
775 | EXPORT_SYMBOL_GPL(soc_codec_device_cs4270); | |
776 | ||
c9b3a40f | 777 | static int __init cs4270_init(void) |
64089b84 MB |
778 | { |
779 | return snd_soc_register_dai(&cs4270_dai); | |
780 | } | |
781 | module_init(cs4270_init); | |
782 | ||
783 | static void __exit cs4270_exit(void) | |
784 | { | |
785 | snd_soc_unregister_dai(&cs4270_dai); | |
786 | } | |
787 | module_exit(cs4270_exit); | |
788 | ||
b0c813ce TT |
789 | MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); |
790 | MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver"); | |
791 | MODULE_LICENSE("GPL"); |