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 tty->receive_room = 16; 230 if (tty->ops->write(tty, v253_init, len) != len) { 231 ret = -EIO; 232 goto err; 233 } 234 /* Actual setup will be performed after the modem responds. */ 235 return 0; 236 err: 237 tty->disc_data = NULL; 238 return ret; 239 } 240 241 /* Line discipline .close() */ 242 static void v253_close(struct tty_struct *tty) 243 { 244 struct snd_soc_codec *codec = tty->disc_data; 245 struct cx20442_priv *cx20442; 246 247 tty->disc_data = NULL; 248 249 if (!codec) 250 return; 251 252 cx20442 = snd_soc_codec_get_drvdata(codec); 253 254 /* Prevent the codec driver from further accessing the modem */ 255 codec->hw_write = NULL; 256 cx20442->control_data = NULL; 257 codec->component.card->pop_time = 0; 258 } 259 260 /* Line discipline .hangup() */ 261 static int v253_hangup(struct tty_struct *tty) 262 { 263 v253_close(tty); 264 return 0; 265 } 266 267 /* Line discipline .receive_buf() */ 268 static void v253_receive(struct tty_struct *tty, 269 const unsigned char *cp, char *fp, int count) 270 { 271 struct snd_soc_codec *codec = tty->disc_data; 272 struct cx20442_priv *cx20442; 273 274 if (!codec) 275 return; 276 277 cx20442 = snd_soc_codec_get_drvdata(codec); 278 279 if (!cx20442->control_data) { 280 /* First modem response, complete setup procedure */ 281 282 /* Set up codec driver access to modem controls */ 283 cx20442->control_data = tty; 284 codec->hw_write = (hw_write_t)tty->ops->write; 285 codec->component.card->pop_time = 1; 286 } 287 } 288 289 /* Line discipline .write_wakeup() */ 290 static void v253_wakeup(struct tty_struct *tty) 291 { 292 } 293 294 struct tty_ldisc_ops v253_ops = { 295 .magic = TTY_LDISC_MAGIC, 296 .name = "cx20442", 297 .owner = THIS_MODULE, 298 .open = v253_open, 299 .close = v253_close, 300 .hangup = v253_hangup, 301 .receive_buf = v253_receive, 302 .write_wakeup = v253_wakeup, 303 }; 304 EXPORT_SYMBOL_GPL(v253_ops); 305 306 307 /* 308 * Codec DAI 309 */ 310 311 static struct snd_soc_dai_driver cx20442_dai = { 312 .name = "cx20442-voice", 313 .playback = { 314 .stream_name = "Playback", 315 .channels_min = 1, 316 .channels_max = 1, 317 .rates = SNDRV_PCM_RATE_8000, 318 .formats = SNDRV_PCM_FMTBIT_S16_LE, 319 }, 320 .capture = { 321 .stream_name = "Capture", 322 .channels_min = 1, 323 .channels_max = 1, 324 .rates = SNDRV_PCM_RATE_8000, 325 .formats = SNDRV_PCM_FMTBIT_S16_LE, 326 }, 327 }; 328 329 static int cx20442_set_bias_level(struct snd_soc_codec *codec, 330 enum snd_soc_bias_level level) 331 { 332 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec); 333 int err = 0; 334 335 switch (level) { 336 case SND_SOC_BIAS_PREPARE: 337 if (snd_soc_codec_get_bias_level(codec) != SND_SOC_BIAS_STANDBY) 338 break; 339 if (IS_ERR(cx20442->por)) 340 err = PTR_ERR(cx20442->por); 341 else 342 err = regulator_enable(cx20442->por); 343 break; 344 case SND_SOC_BIAS_STANDBY: 345 if (snd_soc_codec_get_bias_level(codec) != SND_SOC_BIAS_PREPARE) 346 break; 347 if (IS_ERR(cx20442->por)) 348 err = PTR_ERR(cx20442->por); 349 else 350 err = regulator_disable(cx20442->por); 351 break; 352 default: 353 break; 354 } 355 356 return err; 357 } 358 359 static int cx20442_codec_probe(struct snd_soc_codec *codec) 360 { 361 struct cx20442_priv *cx20442; 362 363 cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL); 364 if (cx20442 == NULL) 365 return -ENOMEM; 366 367 cx20442->por = regulator_get(codec->dev, "POR"); 368 if (IS_ERR(cx20442->por)) 369 dev_warn(codec->dev, "failed to get the regulator"); 370 cx20442->control_data = NULL; 371 372 snd_soc_codec_set_drvdata(codec, cx20442); 373 codec->hw_write = NULL; 374 codec->component.card->pop_time = 0; 375 376 return 0; 377 } 378 379 /* power down chip */ 380 static int cx20442_codec_remove(struct snd_soc_codec *codec) 381 { 382 struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec); 383 384 if (cx20442->control_data) { 385 struct tty_struct *tty = cx20442->control_data; 386 tty_hangup(tty); 387 } 388 389 if (!IS_ERR(cx20442->por)) { 390 /* should be already in STANDBY, hence disabled */ 391 regulator_put(cx20442->por); 392 } 393 394 snd_soc_codec_set_drvdata(codec, NULL); 395 kfree(cx20442); 396 return 0; 397 } 398 399 static const u8 cx20442_reg; 400 401 static struct snd_soc_codec_driver cx20442_codec_dev = { 402 .probe = cx20442_codec_probe, 403 .remove = cx20442_codec_remove, 404 .set_bias_level = cx20442_set_bias_level, 405 .reg_cache_default = &cx20442_reg, 406 .reg_cache_size = 1, 407 .reg_word_size = sizeof(u8), 408 .read = cx20442_read_reg_cache, 409 .write = cx20442_write, 410 .dapm_widgets = cx20442_dapm_widgets, 411 .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets), 412 .dapm_routes = cx20442_audio_map, 413 .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map), 414 }; 415 416 static int cx20442_platform_probe(struct platform_device *pdev) 417 { 418 return snd_soc_register_codec(&pdev->dev, 419 &cx20442_codec_dev, &cx20442_dai, 1); 420 } 421 422 static int cx20442_platform_remove(struct platform_device *pdev) 423 { 424 snd_soc_unregister_codec(&pdev->dev); 425 return 0; 426 } 427 428 static struct platform_driver cx20442_platform_driver = { 429 .driver = { 430 .name = "cx20442-codec", 431 }, 432 .probe = cx20442_platform_probe, 433 .remove = cx20442_platform_remove, 434 }; 435 436 module_platform_driver(cx20442_platform_driver); 437 438 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver"); 439 MODULE_AUTHOR("Janusz Krzysztofik"); 440 MODULE_LICENSE("GPL"); 441 MODULE_ALIAS("platform:cx20442-codec"); 442