1 /* 2 * cx20442.c -- CX20442 ALSA Soc Audio driver 3 * 4 * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> 5 * 6 * Initially based on sound/soc/codecs/wm8400.c 7 * Copyright 2008, 2009 Wolfson Microelectronics PLC. 8 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the 12 * Free Software Foundation; either version 2 of the License, or (at your 13 * option) any later version. 14 */ 15 16 #include <linux/tty.h> 17 #include <linux/slab.h> 18 #include <linux/module.h> 19 #include <linux/regulator/consumer.h> 20 21 #include <sound/core.h> 22 #include <sound/initval.h> 23 #include <sound/soc.h> 24 25 #include "cx20442.h" 26 27 28 struct cx20442_priv { 29 void *control_data; 30 struct regulator *por; 31 }; 32 33 #define CX20442_PM 0x0 34 35 #define CX20442_TELIN 0 36 #define CX20442_TELOUT 1 37 #define CX20442_MIC 2 38 #define CX20442_SPKOUT 3 39 #define CX20442_AGC 4 40 41 static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = { 42 SND_SOC_DAPM_OUTPUT("TELOUT"), 43 SND_SOC_DAPM_OUTPUT("SPKOUT"), 44 SND_SOC_DAPM_OUTPUT("AGCOUT"), 45 46 SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0), 47 48 SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0), 49 SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0), 50 SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0), 51 52 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), 53 SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0), 54 55 SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0), 56 57 SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0), 58 SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0), 59 60 SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0), 61 62 SND_SOC_DAPM_INPUT("TELIN"), 63 SND_SOC_DAPM_INPUT("MIC"), 64 SND_SOC_DAPM_INPUT("AGCIN"), 65 }; 66 67 static const struct snd_soc_dapm_route cx20442_audio_map[] = { 68 {"TELOUT", NULL, "TELOUT Amp"}, 69 70 {"SPKOUT", NULL, "SPKOUT Mixer"}, 71 {"SPKOUT Mixer", NULL, "SPKOUT Amp"}, 72 73 {"TELOUT Amp", NULL, "DAC"}, 74 {"SPKOUT Amp", NULL, "DAC"}, 75 76 {"SPKOUT Mixer", NULL, "SPKOUT AGC"}, 77 {"SPKOUT AGC", NULL, "AGCIN"}, 78 79 {"AGCOUT", NULL, "MIC AGC"}, 80 {"MIC AGC", NULL, "MIC"}, 81 82 {"MIC Bias", NULL, "MIC"}, 83 {"Input Mixer", NULL, "MIC Bias"}, 84 85 {"TELIN Bias", NULL, "TELIN"}, 86 {"Input Mixer", NULL, "TELIN Bias"}, 87 88 {"ADC", NULL, "Input Mixer"}, 89 }; 90 91 static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec, 92 unsigned int reg) 93 { 94 u8 *reg_cache = codec->reg_cache; 95 96 if (reg >= codec->driver->reg_cache_size) 97 return -EINVAL; 98 99 return reg_cache[reg]; 100 } 101 102 enum v253_vls { 103 V253_VLS_NONE = 0, 104 V253_VLS_T, 105 V253_VLS_L, 106 V253_VLS_LT, 107 V253_VLS_S, 108 V253_VLS_ST, 109 V253_VLS_M, 110 V253_VLS_MST, 111 V253_VLS_S1, 112 V253_VLS_S1T, 113 V253_VLS_MS1T, 114 V253_VLS_M1, 115 V253_VLS_M1ST, 116 V253_VLS_M1S1T, 117 V253_VLS_H, 118 V253_VLS_HT, 119 V253_VLS_MS, 120 V253_VLS_MS1, 121 V253_VLS_M1S, 122 V253_VLS_M1S1, 123 V253_VLS_TEST, 124 }; 125 126 static int cx20442_pm_to_v253_vls(u8 value) 127 { 128 switch (value & ~(1 << CX20442_AGC)) { 129 case 0: 130 return V253_VLS_T; 131 case (1 << CX20442_SPKOUT): 132 case (1 << CX20442_MIC): 133 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC): 134 return V253_VLS_M1S1; 135 case (1 << CX20442_TELOUT): 136 case (1 << CX20442_TELIN): 137 case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN): 138 return V253_VLS_L; 139 case (1 << CX20442_TELOUT) | (1 << CX20442_MIC): 140 return V253_VLS_NONE; 141 } 142 return -EINVAL; 143 } 144 static int cx20442_pm_to_v253_vsp(u8 value) 145 { 146 switch (value & ~(1 << CX20442_AGC)) { 147 case (1 << CX20442_SPKOUT): 148 case (1 << CX20442_MIC): 149 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC): 150 return (bool)(value & (1 << CX20442_AGC)); 151 } 152 return (value & (1 << CX20442_AGC)) ? -EINVAL : 0; 153 } 154 155 static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg, 156 unsigned int value) 157 { 158 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec); 159 u8 *reg_cache = codec->reg_cache; 160 int vls, vsp, old, len; 161 char buf[18]; 162 163 if (reg >= codec->driver->reg_cache_size) 164 return -EINVAL; 165 166 /* hw_write and control_data pointers required for talking to the modem 167 * are expected to be set by the line discipline initialization code */ 168 if (!codec->hw_write || !cx20442->control_data) 169 return -EIO; 170 171 old = reg_cache[reg]; 172 reg_cache[reg] = value; 173 174 vls = cx20442_pm_to_v253_vls(value); 175 if (vls < 0) 176 return vls; 177 178 vsp = cx20442_pm_to_v253_vsp(value); 179 if (vsp < 0) 180 return vsp; 181 182 if ((vls == V253_VLS_T) || 183 (vls == cx20442_pm_to_v253_vls(old))) { 184 if (vsp == cx20442_pm_to_v253_vsp(old)) 185 return 0; 186 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp); 187 } else if (vsp == cx20442_pm_to_v253_vsp(old)) 188 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls); 189 else 190 len = snprintf(buf, ARRAY_SIZE(buf), 191 "at+vls=%d;+vsp=%d\r", vls, vsp); 192 193 if (unlikely(len > (ARRAY_SIZE(buf) - 1))) 194 return -ENOMEM; 195 196 dev_dbg(codec->dev, "%s: %s\n", __func__, buf); 197 if (codec->hw_write(cx20442->control_data, buf, len) != len) 198 return -EIO; 199 200 return 0; 201 } 202 203 204 /* 205 * Line discpline related code 206 * 207 * Any of the callback functions below can be used in two ways: 208 * 1) registerd by a machine driver as one of line discipline operations, 209 * 2) called from a machine's provided line discipline callback function 210 * in case when extra machine specific code must be run as well. 211 */ 212 213 /* Modem init: echo off, digital speaker off, quiet off, voice mode */ 214 static const char *v253_init = "ate0m0q0+fclass=8\r"; 215 216 /* Line discipline .open() */ 217 static int v253_open(struct tty_struct *tty) 218 { 219 int ret, len = strlen(v253_init); 220 221 /* Doesn't make sense without write callback */ 222 if (!tty->ops->write) 223 return -EINVAL; 224 225 /* Won't work if no codec pointer has been passed by a card driver */ 226 if (!tty->disc_data) 227 return -ENODEV; 228 229 if (tty->ops->write(tty, v253_init, len) != len) { 230 ret = -EIO; 231 goto err; 232 } 233 /* Actual setup will be performed after the modem responds. */ 234 return 0; 235 err: 236 tty->disc_data = NULL; 237 return ret; 238 } 239 240 /* Line discipline .close() */ 241 static void v253_close(struct tty_struct *tty) 242 { 243 struct snd_soc_codec *codec = tty->disc_data; 244 struct cx20442_priv *cx20442; 245 246 tty->disc_data = NULL; 247 248 if (!codec) 249 return; 250 251 cx20442 = snd_soc_codec_get_drvdata(codec); 252 253 /* Prevent the codec driver from further accessing the modem */ 254 codec->hw_write = NULL; 255 cx20442->control_data = NULL; 256 codec->component.card->pop_time = 0; 257 } 258 259 /* Line discipline .hangup() */ 260 static int v253_hangup(struct tty_struct *tty) 261 { 262 v253_close(tty); 263 return 0; 264 } 265 266 /* Line discipline .receive_buf() */ 267 static void v253_receive(struct tty_struct *tty, 268 const unsigned char *cp, char *fp, int count) 269 { 270 struct snd_soc_codec *codec = tty->disc_data; 271 struct cx20442_priv *cx20442; 272 273 if (!codec) 274 return; 275 276 cx20442 = snd_soc_codec_get_drvdata(codec); 277 278 if (!cx20442->control_data) { 279 /* First modem response, complete setup procedure */ 280 281 /* Set up codec driver access to modem controls */ 282 cx20442->control_data = tty; 283 codec->hw_write = (hw_write_t)tty->ops->write; 284 codec->component.card->pop_time = 1; 285 } 286 } 287 288 /* Line discipline .write_wakeup() */ 289 static void v253_wakeup(struct tty_struct *tty) 290 { 291 } 292 293 struct tty_ldisc_ops v253_ops = { 294 .magic = TTY_LDISC_MAGIC, 295 .name = "cx20442", 296 .owner = THIS_MODULE, 297 .open = v253_open, 298 .close = v253_close, 299 .hangup = v253_hangup, 300 .receive_buf = v253_receive, 301 .write_wakeup = v253_wakeup, 302 }; 303 EXPORT_SYMBOL_GPL(v253_ops); 304 305 306 /* 307 * Codec DAI 308 */ 309 310 static struct snd_soc_dai_driver cx20442_dai = { 311 .name = "cx20442-voice", 312 .playback = { 313 .stream_name = "Playback", 314 .channels_min = 1, 315 .channels_max = 1, 316 .rates = SNDRV_PCM_RATE_8000, 317 .formats = SNDRV_PCM_FMTBIT_S16_LE, 318 }, 319 .capture = { 320 .stream_name = "Capture", 321 .channels_min = 1, 322 .channels_max = 1, 323 .rates = SNDRV_PCM_RATE_8000, 324 .formats = SNDRV_PCM_FMTBIT_S16_LE, 325 }, 326 }; 327 328 static int cx20442_set_bias_level(struct snd_soc_codec *codec, 329 enum snd_soc_bias_level level) 330 { 331 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec); 332 int err = 0; 333 334 switch (level) { 335 case SND_SOC_BIAS_PREPARE: 336 if (codec->dapm.bias_level != SND_SOC_BIAS_STANDBY) 337 break; 338 if (IS_ERR(cx20442->por)) 339 err = PTR_ERR(cx20442->por); 340 else 341 err = regulator_enable(cx20442->por); 342 break; 343 case SND_SOC_BIAS_STANDBY: 344 if (codec->dapm.bias_level != SND_SOC_BIAS_PREPARE) 345 break; 346 if (IS_ERR(cx20442->por)) 347 err = PTR_ERR(cx20442->por); 348 else 349 err = regulator_disable(cx20442->por); 350 break; 351 default: 352 break; 353 } 354 if (!err) 355 codec->dapm.bias_level = level; 356 357 return err; 358 } 359 360 static int cx20442_codec_probe(struct snd_soc_codec *codec) 361 { 362 struct cx20442_priv *cx20442; 363 364 cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL); 365 if (cx20442 == NULL) 366 return -ENOMEM; 367 368 cx20442->por = regulator_get(codec->dev, "POR"); 369 if (IS_ERR(cx20442->por)) 370 dev_warn(codec->dev, "failed to get the regulator"); 371 cx20442->control_data = NULL; 372 373 snd_soc_codec_set_drvdata(codec, cx20442); 374 codec->hw_write = NULL; 375 codec->component.card->pop_time = 0; 376 377 return 0; 378 } 379 380 /* power down chip */ 381 static int cx20442_codec_remove(struct snd_soc_codec *codec) 382 { 383 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec); 384 385 if (cx20442->control_data) { 386 struct tty_struct *tty = cx20442->control_data; 387 tty_hangup(tty); 388 } 389 390 if (!IS_ERR(cx20442->por)) { 391 /* should be already in STANDBY, hence disabled */ 392 regulator_put(cx20442->por); 393 } 394 395 snd_soc_codec_set_drvdata(codec, NULL); 396 kfree(cx20442); 397 return 0; 398 } 399 400 static const u8 cx20442_reg; 401 402 static struct snd_soc_codec_driver cx20442_codec_dev = { 403 .probe = cx20442_codec_probe, 404 .remove = cx20442_codec_remove, 405 .set_bias_level = cx20442_set_bias_level, 406 .reg_cache_default = &cx20442_reg, 407 .reg_cache_size = 1, 408 .reg_word_size = sizeof(u8), 409 .read = cx20442_read_reg_cache, 410 .write = cx20442_write, 411 .dapm_widgets = cx20442_dapm_widgets, 412 .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets), 413 .dapm_routes = cx20442_audio_map, 414 .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map), 415 }; 416 417 static int cx20442_platform_probe(struct platform_device *pdev) 418 { 419 return snd_soc_register_codec(&pdev->dev, 420 &cx20442_codec_dev, &cx20442_dai, 1); 421 } 422 423 static int __exit cx20442_platform_remove(struct platform_device *pdev) 424 { 425 snd_soc_unregister_codec(&pdev->dev); 426 return 0; 427 } 428 429 static struct platform_driver cx20442_platform_driver = { 430 .driver = { 431 .name = "cx20442-codec", 432 }, 433 .probe = cx20442_platform_probe, 434 .remove = __exit_p(cx20442_platform_remove), 435 }; 436 437 module_platform_driver(cx20442_platform_driver); 438 439 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver"); 440 MODULE_AUTHOR("Janusz Krzysztofik"); 441 MODULE_LICENSE("GPL"); 442 MODULE_ALIAS("platform:cx20442-codec"); 443