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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 | * | |
15 | * 1) Stand-alone and software mode is supported. Stand-alone is | |
16 | * automatically selected if I2C is disabled or if a CS4270 is not found | |
17 | * on the I2C bus. | |
18 | * 2) Only I2C is supported, not SPI | |
19 | * 3) Only Master mode is supported, not Slave. | |
20 | * 4) The machine driver's 'startup' function must call | |
21 | * cs4270_set_dai_sysclk() with the value of MCLK. | |
22 | * 5) Only I2S and left-justified modes are supported | |
23 | * 6) Power management is not supported | |
24 | * 7) The only supported control is volume and hardware mute (if enabled) | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <sound/driver.h> | |
30 | #include <sound/core.h> | |
31 | #include <sound/soc.h> | |
32 | #include <sound/initval.h> | |
33 | #include <linux/i2c.h> | |
34 | ||
35 | #include "cs4270.h" | |
36 | ||
37 | /* Private data for the CS4270 */ | |
38 | struct cs4270_private { | |
39 | unsigned int mclk; /* Input frequency of the MCLK pin */ | |
40 | unsigned int mode; /* The mode (I2S or left-justified) */ | |
41 | }; | |
42 | ||
43 | /* | |
44 | * The codec isn't really big-endian or little-endian, since the I2S | |
45 | * interface requires data to be sent serially with the MSbit first. | |
46 | * However, to support BE and LE I2S devices, we specify both here. That | |
47 | * way, ALSA will always match the bit patterns. | |
48 | */ | |
49 | #define CS4270_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ | |
50 | SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \ | |
51 | SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \ | |
52 | SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \ | |
53 | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \ | |
54 | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE) | |
55 | ||
56 | #ifdef CONFIG_I2C | |
57 | ||
58 | /* CS4270 registers addresses */ | |
59 | #define CS4270_CHIPID 0x01 /* Chip ID */ | |
60 | #define CS4270_PWRCTL 0x02 /* Power Control */ | |
61 | #define CS4270_MODE 0x03 /* Mode Control */ | |
62 | #define CS4270_FORMAT 0x04 /* Serial Format, ADC/DAC Control */ | |
63 | #define CS4270_TRANS 0x05 /* Transition Control */ | |
64 | #define CS4270_MUTE 0x06 /* Mute Control */ | |
65 | #define CS4270_VOLA 0x07 /* DAC Channel A Volume Control */ | |
66 | #define CS4270_VOLB 0x08 /* DAC Channel B Volume Control */ | |
67 | ||
68 | #define CS4270_FIRSTREG 0x01 | |
69 | #define CS4270_LASTREG 0x08 | |
70 | #define CS4270_NUMREGS (CS4270_LASTREG - CS4270_FIRSTREG + 1) | |
71 | ||
72 | /* Bit masks for the CS4270 registers */ | |
73 | #define CS4270_CHIPID_ID 0xF0 | |
74 | #define CS4270_CHIPID_REV 0x0F | |
75 | #define CS4270_PWRCTL_FREEZE 0x80 | |
76 | #define CS4270_PWRCTL_PDN_ADC 0x20 | |
77 | #define CS4270_PWRCTL_PDN_DAC 0x02 | |
78 | #define CS4270_PWRCTL_PDN 0x01 | |
79 | #define CS4270_MODE_SPEED_MASK 0x30 | |
80 | #define CS4270_MODE_1X 0x00 | |
81 | #define CS4270_MODE_2X 0x10 | |
82 | #define CS4270_MODE_4X 0x20 | |
83 | #define CS4270_MODE_SLAVE 0x30 | |
84 | #define CS4270_MODE_DIV_MASK 0x0E | |
85 | #define CS4270_MODE_DIV1 0x00 | |
86 | #define CS4270_MODE_DIV15 0x02 | |
87 | #define CS4270_MODE_DIV2 0x04 | |
88 | #define CS4270_MODE_DIV3 0x06 | |
89 | #define CS4270_MODE_DIV4 0x08 | |
90 | #define CS4270_MODE_POPGUARD 0x01 | |
91 | #define CS4270_FORMAT_FREEZE_A 0x80 | |
92 | #define CS4270_FORMAT_FREEZE_B 0x40 | |
93 | #define CS4270_FORMAT_LOOPBACK 0x20 | |
94 | #define CS4270_FORMAT_DAC_MASK 0x18 | |
95 | #define CS4270_FORMAT_DAC_LJ 0x00 | |
96 | #define CS4270_FORMAT_DAC_I2S 0x08 | |
97 | #define CS4270_FORMAT_DAC_RJ16 0x18 | |
98 | #define CS4270_FORMAT_DAC_RJ24 0x10 | |
99 | #define CS4270_FORMAT_ADC_MASK 0x01 | |
100 | #define CS4270_FORMAT_ADC_LJ 0x00 | |
101 | #define CS4270_FORMAT_ADC_I2S 0x01 | |
102 | #define CS4270_TRANS_ONE_VOL 0x80 | |
103 | #define CS4270_TRANS_SOFT 0x40 | |
104 | #define CS4270_TRANS_ZERO 0x20 | |
105 | #define CS4270_TRANS_INV_ADC_A 0x08 | |
106 | #define CS4270_TRANS_INV_ADC_B 0x10 | |
107 | #define CS4270_TRANS_INV_DAC_A 0x02 | |
108 | #define CS4270_TRANS_INV_DAC_B 0x04 | |
109 | #define CS4270_TRANS_DEEMPH 0x01 | |
110 | #define CS4270_MUTE_AUTO 0x20 | |
111 | #define CS4270_MUTE_ADC_A 0x08 | |
112 | #define CS4270_MUTE_ADC_B 0x10 | |
113 | #define CS4270_MUTE_POLARITY 0x04 | |
114 | #define CS4270_MUTE_DAC_A 0x01 | |
115 | #define CS4270_MUTE_DAC_B 0x02 | |
116 | ||
117 | /* | |
118 | * A list of addresses on which this CS4270 could use. I2C addresses are | |
119 | * 7 bits. For the CS4270, the upper four bits are always 1001, and the | |
120 | * lower three bits are determined via the AD2, AD1, and AD0 pins | |
121 | * (respectively). | |
122 | */ | |
123 | static unsigned short normal_i2c[] = { | |
124 | 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, I2C_CLIENT_END | |
125 | }; | |
126 | I2C_CLIENT_INSMOD; | |
127 | ||
128 | /* | |
129 | * Pre-fill the CS4270 register cache. | |
130 | * | |
131 | * We use the auto-increment feature of the CS4270 to read all registers in | |
132 | * one shot. | |
133 | */ | |
134 | static int cs4270_fill_cache(struct snd_soc_codec *codec) | |
135 | { | |
136 | u8 *cache = codec->reg_cache; | |
137 | struct i2c_client *i2c_client = codec->control_data; | |
138 | s32 length; | |
139 | ||
140 | length = i2c_smbus_read_i2c_block_data(i2c_client, | |
141 | CS4270_FIRSTREG | 0x80, CS4270_NUMREGS, cache); | |
142 | ||
143 | if (length != CS4270_NUMREGS) { | |
144 | printk(KERN_ERR "cs4270: I2C read failure, addr=%u\n", | |
145 | i2c_client->addr); | |
146 | return -EIO; | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | /* | |
153 | * Read from the CS4270 register cache. | |
154 | * | |
155 | * This CS4270 registers are cached to avoid excessive I2C I/O operations. | |
156 | * After the initial read to pre-fill the cache, the CS4270 never updates | |
157 | * the register values, so we won't have a cache coherncy problem. | |
158 | */ | |
159 | static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec, | |
160 | unsigned int reg) | |
161 | { | |
162 | u8 *cache = codec->reg_cache; | |
163 | ||
164 | if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) | |
165 | return -EIO; | |
166 | ||
167 | return cache[reg - CS4270_FIRSTREG]; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Write to a CS4270 register via the I2C bus. | |
172 | * | |
173 | * This function writes the given value to the given CS4270 register, and | |
174 | * also updates the register cache. | |
175 | * | |
176 | * Note that we don't use the hw_write function pointer of snd_soc_codec. | |
177 | * That's because it's too clunky: the hw_write_t prototype does not match | |
178 | * i2c_smbus_write_byte_data(), and it's just another layer of overhead. | |
179 | */ | |
180 | static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg, | |
181 | unsigned int value) | |
182 | { | |
183 | if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) | |
184 | return -EIO; | |
185 | ||
186 | if (i2c_smbus_write_byte_data(codec->control_data, reg, value) == 0) { | |
187 | /* We've written to the hardware, so update the cache */ | |
188 | u8 *cache = codec->reg_cache; | |
189 | cache[reg - CS4270_FIRSTREG] = value; | |
190 | return 0; | |
191 | } else { | |
192 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
193 | return -EIO; | |
194 | } | |
195 | } | |
196 | ||
197 | /* | |
198 | * Clock Ratio Selection for Master Mode. | |
199 | * | |
200 | * The data for this chart is taken from Table 5 of the CS4270 reference | |
201 | * manual. | |
202 | * | |
203 | * This table is used to determine how to program the Mode Control register. | |
204 | * It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling | |
205 | * rates the CS4270 currently supports. | |
206 | * | |
207 | * 'ratio' is the MCLK/LRCK ratio. MCLK is usually a fixed input frequency, | |
208 | * and LRCK is equal to the sampling rate. The CS4270 only supports sampling | |
209 | * rates where this ratio is one of: 64, 96, 128, 192, 256, 384, 512, 768 or | |
210 | * 1024. | |
211 | * | |
212 | * 'speed_mode' is the corresponding bit pattern to be written to the | |
213 | * MODE bits of the Mode Control Register | |
214 | * | |
215 | * 'mclk' is the corresponding bit pattern to be wirten to the MCLK bits of | |
216 | * the Mode Control Register. | |
217 | * | |
218 | * In situations where a single ratio is represented by multiple speed | |
219 | * modes, we favor the slowest speed. E.g, for a ratio of 128, we pick | |
220 | * double-speed instead of quad-speed. However, the CS4270 errata states | |
221 | * that Divide-By-1.5 can cause failures, so we avoid that mode where | |
222 | * possible. | |
223 | * | |
224 | * ERRATA: There is an errata for the CS4270 where divide-by-1.5 does not | |
225 | * work if VD = 3.3V. If this effects you, select the | |
226 | * CONFIG_SND_SOC_CS4270_VD33_ERRATA Kconfig option, and the driver will | |
227 | * never select any sample rates that require divide-by-1.5. | |
228 | */ | |
229 | static struct { | |
230 | unsigned int ratio; | |
231 | u8 speed_mode; | |
232 | u8 mclk; | |
233 | } cs4270_mode_ratios[] = { | |
234 | {64, CS4270_MODE_4X, CS4270_MODE_DIV1}, | |
235 | #ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA | |
236 | {96, CS4270_MODE_4X, CS4270_MODE_DIV15}, | |
237 | #endif | |
238 | {128, CS4270_MODE_2X, CS4270_MODE_DIV1}, | |
239 | {192, CS4270_MODE_4X, CS4270_MODE_DIV3}, | |
240 | {256, CS4270_MODE_1X, CS4270_MODE_DIV1}, | |
241 | {384, CS4270_MODE_2X, CS4270_MODE_DIV3}, | |
242 | {512, CS4270_MODE_1X, CS4270_MODE_DIV2}, | |
243 | {768, CS4270_MODE_1X, CS4270_MODE_DIV3}, | |
244 | {1024, CS4270_MODE_1X, CS4270_MODE_DIV4} | |
245 | }; | |
246 | ||
247 | /* | |
248 | * Program the CS4270 with the given hardware parameters. | |
249 | * | |
250 | * The .dai_ops functions are used to provide board-specific data, like | |
251 | * input frequencies, to this driver. This function takes that information, | |
252 | * combines it with the hardware parameters provided, and programs the | |
253 | * hardware accordingly. | |
254 | */ | |
255 | static int cs4270_hw_params(struct snd_pcm_substream *substream, | |
256 | struct snd_pcm_hw_params *params) | |
257 | { | |
258 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
259 | struct snd_soc_device *socdev = rtd->socdev; | |
260 | struct snd_soc_codec *codec = socdev->codec; | |
261 | struct cs4270_private *cs4270 = codec->private_data; | |
262 | unsigned int ret = 0; | |
263 | unsigned int i; | |
264 | unsigned int rate; | |
265 | unsigned int ratio; | |
266 | int reg; | |
267 | ||
268 | /* Figure out which MCLK/LRCK ratio to use */ | |
269 | ||
270 | rate = params_rate(params); /* Sampling rate, in Hz */ | |
271 | ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */ | |
272 | ||
273 | for (i = 0; i < ARRAY_SIZE(cs4270_mode_ratios); i++) { | |
274 | if (cs4270_mode_ratios[i].ratio == ratio) | |
275 | break; | |
276 | } | |
277 | ||
278 | if (i == ARRAY_SIZE(cs4270_mode_ratios)) { | |
279 | /* We did not find a matching ratio */ | |
280 | printk(KERN_ERR "cs4270: could not find matching ratio\n"); | |
281 | return -EINVAL; | |
282 | } | |
283 | ||
284 | /* Freeze and power-down the codec */ | |
285 | ||
286 | ret = snd_soc_write(codec, CS4270_PWRCTL, CS4270_PWRCTL_FREEZE | | |
287 | CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC | | |
288 | CS4270_PWRCTL_PDN); | |
289 | if (ret < 0) { | |
290 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
291 | return ret; | |
292 | } | |
293 | ||
294 | /* Program the mode control register */ | |
295 | ||
296 | reg = snd_soc_read(codec, CS4270_MODE); | |
297 | reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK); | |
298 | reg |= cs4270_mode_ratios[i].speed_mode | cs4270_mode_ratios[i].mclk; | |
299 | ||
300 | ret = snd_soc_write(codec, CS4270_MODE, reg); | |
301 | if (ret < 0) { | |
302 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
303 | return ret; | |
304 | } | |
305 | ||
306 | /* Program the format register */ | |
307 | ||
308 | reg = snd_soc_read(codec, CS4270_FORMAT); | |
309 | reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK); | |
310 | ||
311 | switch (cs4270->mode) { | |
312 | case SND_SOC_DAIFMT_I2S: | |
313 | reg |= CS4270_FORMAT_DAC_I2S | CS4270_FORMAT_ADC_I2S; | |
314 | break; | |
315 | case SND_SOC_DAIFMT_LEFT_J: | |
316 | reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ; | |
317 | break; | |
318 | default: | |
319 | printk(KERN_ERR "cs4270: unknown format\n"); | |
320 | return -EINVAL; | |
321 | } | |
322 | ||
323 | ret = snd_soc_write(codec, CS4270_FORMAT, reg); | |
324 | if (ret < 0) { | |
325 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
326 | return ret; | |
327 | } | |
328 | ||
329 | /* Disable auto-mute. This feature appears to be buggy, because in | |
330 | some situations, auto-mute will not deactivate when it should. */ | |
331 | ||
332 | reg = snd_soc_read(codec, CS4270_MUTE); | |
333 | reg &= ~CS4270_MUTE_AUTO; | |
334 | ret = snd_soc_write(codec, CS4270_MUTE, reg); | |
335 | if (ret < 0) { | |
336 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
337 | return ret; | |
338 | } | |
339 | ||
340 | /* Thaw and power-up the codec */ | |
341 | ||
342 | ret = snd_soc_write(codec, CS4270_PWRCTL, 0); | |
343 | if (ret < 0) { | |
344 | printk(KERN_ERR "cs4270: I2C write failed\n"); | |
345 | return ret; | |
346 | } | |
347 | ||
348 | return ret; | |
349 | } | |
350 | ||
351 | #ifdef CONFIG_SND_SOC_CS4270_HWMUTE | |
352 | ||
353 | /* | |
354 | * Set the CS4270 external mute | |
355 | * | |
356 | * This function toggles the mute bits in the MUTE register. The CS4270's | |
357 | * mute capability is intended for external muting circuitry, so if the | |
358 | * board does not have the MUTEA or MUTEB pins connected to such circuitry, | |
359 | * then this function will do nothing. | |
360 | */ | |
361 | static int cs4270_mute(struct snd_soc_codec_dai *dai, int mute) | |
362 | { | |
363 | struct snd_soc_codec *codec = dai->codec; | |
364 | int reg6; | |
365 | ||
366 | reg6 = snd_soc_read(codec, CS4270_MUTE); | |
367 | ||
368 | if (mute) | |
369 | reg6 |= CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B | | |
370 | CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B; | |
371 | else | |
372 | reg6 &= ~(CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B | | |
373 | CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B); | |
374 | ||
375 | return snd_soc_write(codec, CS4270_MUTE, reg6); | |
376 | } | |
377 | ||
378 | #endif | |
379 | ||
380 | /* | |
381 | * Sampling rate <-> bit patter mapping | |
382 | * | |
383 | * This array maps sampling rates to their SNDRV_PCM_RATE_x equivalent. | |
384 | * | |
385 | * This is really something that ALSA should provide. | |
386 | * | |
387 | * This table is used by cs4270_set_dai_sysclk() to tell ALSA which sampling | |
388 | * rates the CS4270 currently supports. | |
389 | */ | |
390 | static struct { | |
391 | unsigned int rate; | |
392 | unsigned int bit; | |
393 | } rate_map[] = { | |
394 | {5512, SNDRV_PCM_RATE_5512}, | |
395 | {8000, SNDRV_PCM_RATE_8000}, | |
396 | {11025, SNDRV_PCM_RATE_11025}, | |
397 | {16000, SNDRV_PCM_RATE_16000}, | |
398 | {22050, SNDRV_PCM_RATE_22050}, | |
399 | {32000, SNDRV_PCM_RATE_32000}, | |
400 | {44100, SNDRV_PCM_RATE_44100}, | |
401 | {48000, SNDRV_PCM_RATE_48000}, | |
402 | {64000, SNDRV_PCM_RATE_64000}, | |
403 | {88200, SNDRV_PCM_RATE_88200}, | |
404 | {96000, SNDRV_PCM_RATE_96000}, | |
405 | {176400, SNDRV_PCM_RATE_176400}, | |
406 | {192000, SNDRV_PCM_RATE_192000} | |
407 | }; | |
408 | ||
409 | /* | |
410 | * Determine the CS4270 samples rates. | |
411 | * | |
412 | * 'freq' is the input frequency to MCLK. The other parameters are ignored. | |
413 | * | |
414 | * The value of MCLK is used to determine which sample rates are supported | |
415 | * by the CS4270. The ratio of MCLK / Fs must be equal to one of nine | |
416 | * support values: 64, 96, 128, 192, 256, 384, 512, 768, and 1024. | |
417 | * | |
418 | * This function calculates the nine ratios and determines which ones match | |
419 | * a standard sample rate. If there's a match, then it is added to the list | |
420 | * of support sample rates. | |
421 | * | |
422 | * This function must be called by the machine driver's 'startup' function, | |
423 | * otherwise the list of supported sample rates will not be available in | |
424 | * time for ALSA. | |
425 | */ | |
426 | static int cs4270_set_dai_sysclk(struct snd_soc_codec_dai *codec_dai, | |
427 | int clk_id, unsigned int freq, int dir) | |
428 | { | |
429 | struct snd_soc_codec *codec = codec_dai->codec; | |
430 | struct cs4270_private *cs4270 = codec->private_data; | |
431 | unsigned int rates = 0; | |
432 | unsigned int rate_min = -1; | |
433 | unsigned int rate_max = 0; | |
434 | unsigned int i; | |
435 | ||
436 | cs4270->mclk = freq; | |
437 | ||
438 | for (i = 0; i < ARRAY_SIZE(cs4270_mode_ratios); i++) { | |
439 | unsigned int rate; | |
440 | unsigned int j; | |
441 | rate = freq / cs4270_mode_ratios[i].ratio; | |
442 | for (j = 0; j < ARRAY_SIZE(rate_map); j++) { | |
443 | if (rate == rate_map[j].rate) { | |
444 | rates |= rate_map[j].bit; | |
445 | if (rate < rate_min) | |
446 | rate_min = rate; | |
447 | if (rate > rate_max) | |
448 | rate_max = rate; | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
453 | if (!rate_max) { | |
454 | printk(KERN_ERR "cs4270: could not find a valid rate\n"); | |
455 | return -EINVAL; | |
456 | } | |
457 | ||
458 | codec_dai->playback.rates = rates; | |
459 | codec_dai->playback.rate_min = rate_min; | |
460 | codec_dai->playback.rate_max = rate_max; | |
461 | ||
462 | codec_dai->capture.rates = rates; | |
463 | codec_dai->capture.rate_min = rate_min; | |
464 | codec_dai->capture.rate_max = rate_max; | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
469 | /* | |
470 | * Configure the codec for the selected audio format | |
471 | * | |
472 | * This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the | |
473 | * codec accordingly. | |
474 | * | |
475 | * Currently, this function only supports SND_SOC_DAIFMT_I2S and | |
476 | * SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified | |
477 | * data for playback only, but ASoC currently does not support different | |
478 | * formats for playback vs. record. | |
479 | */ | |
480 | static int cs4270_set_dai_fmt(struct snd_soc_codec_dai *codec_dai, | |
481 | unsigned int format) | |
482 | { | |
483 | struct snd_soc_codec *codec = codec_dai->codec; | |
484 | struct cs4270_private *cs4270 = codec->private_data; | |
485 | int ret = 0; | |
486 | ||
487 | switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { | |
488 | case SND_SOC_DAIFMT_I2S: | |
489 | case SND_SOC_DAIFMT_LEFT_J: | |
490 | cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK; | |
491 | break; | |
492 | default: | |
493 | printk(KERN_ERR "cs4270: invalid DAI format\n"); | |
494 | ret = -EINVAL; | |
495 | } | |
496 | ||
497 | return ret; | |
498 | } | |
499 | ||
500 | static int cs4270_i2c_probe(struct i2c_adapter *adap, int addr, int kind); | |
501 | ||
502 | /* | |
503 | * Notify the driver that a new I2C bus has been found. | |
504 | * | |
505 | * This function is called for each I2C bus in the system. The function | |
506 | * then asks the I2C subsystem to probe that bus at the addresses on which | |
507 | * our device (the CS4270) could exist. If a device is found at one of | |
508 | * those addresses, then our probe function (cs4270_i2c_probe) is called. | |
509 | */ | |
510 | static int cs4270_i2c_attach(struct i2c_adapter *adapter) | |
511 | { | |
512 | return i2c_probe(adapter, &addr_data, cs4270_i2c_probe); | |
513 | } | |
514 | ||
515 | static int cs4270_i2c_detach(struct i2c_client *client) | |
516 | { | |
517 | struct snd_soc_codec *codec = i2c_get_clientdata(client); | |
518 | ||
519 | i2c_detach_client(client); | |
520 | codec->control_data = NULL; | |
521 | ||
522 | kfree(codec->reg_cache); | |
523 | codec->reg_cache = NULL; | |
524 | ||
525 | kfree(client); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | /* A list of non-DAPM controls that the CS4270 supports */ | |
530 | static const struct snd_kcontrol_new cs4270_snd_controls[] = { | |
531 | SOC_DOUBLE_R("Master Playback Volume", | |
532 | CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 0) | |
533 | }; | |
534 | ||
535 | static struct i2c_driver cs4270_i2c_driver = { | |
536 | .driver = { | |
537 | .name = "CS4270 I2C", | |
538 | .owner = THIS_MODULE, | |
539 | }, | |
540 | .id = I2C_DRIVERID_CS4270, | |
541 | .attach_adapter = cs4270_i2c_attach, | |
542 | .detach_client = cs4270_i2c_detach, | |
543 | }; | |
544 | ||
545 | /* | |
546 | * Global variable to store socdev for i2c probe function. | |
547 | * | |
548 | * If struct i2c_driver had a private_data field, we wouldn't need to use | |
549 | * cs4270_socdec. This is the only way to pass the socdev structure to | |
550 | * cs4270_i2c_probe(). | |
551 | * | |
552 | * The real solution to cs4270_socdev is to create a mechanism | |
553 | * that maps I2C addresses to snd_soc_device structures. Perhaps the | |
554 | * creation of the snd_soc_device object should be moved out of | |
555 | * cs4270_probe() and into cs4270_i2c_probe(), but that would make this | |
556 | * driver dependent on I2C. The CS4270 supports "stand-alone" mode, whereby | |
557 | * the chip is *not* connected to the I2C bus, but is instead configured via | |
558 | * input pins. | |
559 | */ | |
560 | static struct snd_soc_device *cs4270_socdev; | |
561 | ||
562 | /* | |
563 | * Initialize the I2C interface of the CS4270 | |
564 | * | |
565 | * This function is called for whenever the I2C subsystem finds a device | |
566 | * at a particular address. | |
567 | * | |
568 | * Note: snd_soc_new_pcms() must be called before this function can be called, | |
569 | * because of snd_ctl_add(). | |
570 | */ | |
571 | static int cs4270_i2c_probe(struct i2c_adapter *adapter, int addr, int kind) | |
572 | { | |
573 | struct snd_soc_device *socdev = cs4270_socdev; | |
574 | struct snd_soc_codec *codec = socdev->codec; | |
575 | struct i2c_client *i2c_client = NULL; | |
576 | int i; | |
577 | int ret = 0; | |
578 | ||
579 | /* Probing all possible addresses has one drawback: if there are | |
580 | multiple CS4270s on the bus, then you cannot specify which | |
581 | socdev is matched with which CS4270. For now, we just reject | |
582 | this I2C device if the socdev already has one attached. */ | |
583 | if (codec->control_data) | |
584 | return -ENODEV; | |
585 | ||
586 | /* Note: codec_dai->codec is NULL here */ | |
587 | ||
588 | i2c_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); | |
589 | if (!i2c_client) { | |
590 | printk(KERN_ERR "cs4270: could not allocate I2C client\n"); | |
591 | return -ENOMEM; | |
592 | } | |
593 | ||
594 | codec->reg_cache = kzalloc(CS4270_NUMREGS, GFP_KERNEL); | |
595 | if (!codec->reg_cache) { | |
596 | printk(KERN_ERR "cs4270: could not allocate register cache\n"); | |
597 | ret = -ENOMEM; | |
598 | goto error; | |
599 | } | |
600 | ||
601 | i2c_set_clientdata(i2c_client, codec); | |
602 | strcpy(i2c_client->name, "CS4270"); | |
603 | ||
604 | i2c_client->driver = &cs4270_i2c_driver; | |
605 | i2c_client->adapter = adapter; | |
606 | i2c_client->addr = addr; | |
607 | ||
608 | /* Verify that we have a CS4270 */ | |
609 | ||
610 | ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID); | |
611 | if (ret < 0) { | |
612 | printk(KERN_ERR "cs4270: failed to read I2C\n"); | |
613 | goto error; | |
614 | } | |
615 | /* The top four bits of the chip ID should be 1100. */ | |
616 | if ((ret & 0xF0) != 0xC0) { | |
617 | /* The device at this address is not a CS4270 codec */ | |
618 | ret = -ENODEV; | |
619 | goto error; | |
620 | } | |
621 | ||
622 | printk(KERN_INFO "cs4270: found device at I2C address %X\n", addr); | |
623 | printk(KERN_INFO "cs4270: hardware revision %X\n", ret & 0xF); | |
624 | ||
625 | /* Tell the I2C layer a new client has arrived */ | |
626 | ||
627 | ret = i2c_attach_client(i2c_client); | |
628 | if (ret) { | |
629 | printk(KERN_ERR "cs4270: could not attach codec, " | |
630 | "I2C address %x, error code %i\n", addr, ret); | |
631 | goto error; | |
632 | } | |
633 | ||
634 | codec->control_data = i2c_client; | |
635 | codec->read = cs4270_read_reg_cache; | |
636 | codec->write = cs4270_i2c_write; | |
637 | codec->reg_cache_size = CS4270_NUMREGS; | |
638 | ||
639 | /* The I2C interface is set up, so pre-fill our register cache */ | |
640 | ||
641 | ret = cs4270_fill_cache(codec); | |
642 | if (ret < 0) { | |
643 | printk(KERN_ERR "cs4270: failed to fill register cache\n"); | |
644 | goto error; | |
645 | } | |
646 | ||
647 | /* Add the non-DAPM controls */ | |
648 | ||
649 | for (i = 0; i < ARRAY_SIZE(cs4270_snd_controls); i++) { | |
650 | struct snd_kcontrol *kctrl = | |
651 | snd_soc_cnew(&cs4270_snd_controls[i], codec, NULL); | |
652 | ||
653 | ret = snd_ctl_add(codec->card, kctrl); | |
654 | if (ret < 0) | |
655 | goto error; | |
656 | } | |
657 | ||
658 | return 0; | |
659 | ||
660 | error: | |
661 | if (codec->control_data) { | |
662 | i2c_detach_client(i2c_client); | |
663 | codec->control_data = NULL; | |
664 | } | |
665 | ||
666 | kfree(codec->reg_cache); | |
667 | codec->reg_cache = NULL; | |
668 | codec->reg_cache_size = 0; | |
669 | ||
670 | kfree(i2c_client); | |
671 | ||
672 | return ret; | |
673 | } | |
674 | ||
675 | #endif | |
676 | ||
677 | struct snd_soc_codec_dai cs4270_dai = { | |
678 | .name = "CS4270", | |
679 | .playback = { | |
680 | .stream_name = "Playback", | |
681 | .channels_min = 1, | |
682 | .channels_max = 2, | |
683 | .rates = 0, | |
684 | .formats = CS4270_FORMATS, | |
685 | }, | |
686 | .capture = { | |
687 | .stream_name = "Capture", | |
688 | .channels_min = 1, | |
689 | .channels_max = 2, | |
690 | .rates = 0, | |
691 | .formats = CS4270_FORMATS, | |
692 | }, | |
693 | .dai_ops = { | |
694 | .set_sysclk = cs4270_set_dai_sysclk, | |
695 | .set_fmt = cs4270_set_dai_fmt, | |
696 | } | |
697 | }; | |
698 | EXPORT_SYMBOL_GPL(cs4270_dai); | |
699 | ||
700 | /* | |
701 | * ASoC probe function | |
702 | * | |
703 | * This function is called when the machine driver calls | |
704 | * platform_device_add(). | |
705 | */ | |
706 | static int cs4270_probe(struct platform_device *pdev) | |
707 | { | |
708 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
709 | struct snd_soc_codec *codec; | |
710 | int ret = 0; | |
711 | ||
712 | printk(KERN_INFO "CS4270 ALSA SoC Codec\n"); | |
713 | ||
714 | /* Allocate enough space for the snd_soc_codec structure | |
715 | and our private data together. */ | |
716 | codec = kzalloc(ALIGN(sizeof(struct snd_soc_codec), 4) + | |
717 | sizeof(struct cs4270_private), GFP_KERNEL); | |
718 | if (!codec) { | |
719 | printk(KERN_ERR "cs4270: Could not allocate codec structure\n"); | |
720 | return -ENOMEM; | |
721 | } | |
722 | ||
723 | mutex_init(&codec->mutex); | |
724 | INIT_LIST_HEAD(&codec->dapm_widgets); | |
725 | INIT_LIST_HEAD(&codec->dapm_paths); | |
726 | ||
727 | codec->name = "CS4270"; | |
728 | codec->owner = THIS_MODULE; | |
729 | codec->dai = &cs4270_dai; | |
730 | codec->num_dai = 1; | |
731 | codec->private_data = codec + ALIGN(sizeof(struct snd_soc_codec), 4); | |
732 | ||
733 | socdev->codec = codec; | |
734 | ||
735 | /* Register PCMs */ | |
736 | ||
737 | ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); | |
738 | if (ret < 0) { | |
739 | printk(KERN_ERR "cs4270: failed to create PCMs\n"); | |
740 | return ret; | |
741 | } | |
742 | ||
743 | #ifdef CONFIG_I2C | |
744 | cs4270_socdev = socdev; | |
745 | ||
746 | ret = i2c_add_driver(&cs4270_i2c_driver); | |
747 | if (ret) { | |
748 | printk(KERN_ERR "cs4270: failed to attach driver"); | |
749 | snd_soc_free_pcms(socdev); | |
750 | return ret; | |
751 | } | |
752 | ||
753 | /* Did we find a CS4270 on the I2C bus? */ | |
754 | if (codec->control_data) { | |
755 | /* Initialize codec ops */ | |
756 | cs4270_dai.ops.hw_params = cs4270_hw_params; | |
757 | #ifdef CONFIG_SND_SOC_CS4270_HWMUTE | |
758 | cs4270_dai.dai_ops.digital_mute = cs4270_mute; | |
759 | #endif | |
760 | } else | |
761 | printk(KERN_INFO "cs4270: no I2C device found, " | |
762 | "using stand-alone mode\n"); | |
763 | #else | |
764 | printk(KERN_INFO "cs4270: I2C disabled, using stand-alone mode\n"); | |
765 | #endif | |
766 | ||
767 | ret = snd_soc_register_card(socdev); | |
768 | if (ret < 0) { | |
769 | printk(KERN_ERR "cs4270: failed to register card\n"); | |
770 | snd_soc_free_pcms(socdev); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | return ret; | |
775 | } | |
776 | ||
777 | static int cs4270_remove(struct platform_device *pdev) | |
778 | { | |
779 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
780 | ||
781 | snd_soc_free_pcms(socdev); | |
782 | ||
783 | #ifdef CONFIG_I2C | |
784 | if (socdev->codec->control_data) | |
785 | i2c_del_driver(&cs4270_i2c_driver); | |
786 | #endif | |
787 | ||
788 | kfree(socdev->codec); | |
789 | socdev->codec = NULL; | |
790 | ||
791 | return 0; | |
792 | } | |
793 | ||
794 | /* | |
795 | * ASoC codec device structure | |
796 | * | |
797 | * Assign this variable to the codec_dev field of the machine driver's | |
798 | * snd_soc_device structure. | |
799 | */ | |
800 | struct snd_soc_codec_device soc_codec_device_cs4270 = { | |
801 | .probe = cs4270_probe, | |
802 | .remove = cs4270_remove | |
803 | }; | |
804 | EXPORT_SYMBOL_GPL(soc_codec_device_cs4270); | |
805 | ||
806 | MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); | |
807 | MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver"); | |
808 | MODULE_LICENSE("GPL"); |