1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * cx20442.c -- CX20442 ALSA Soc Audio driver 4 * 5 * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> 6 * 7 * Initially based on sound/soc/codecs/wm8400.c 8 * Copyright 2008, 2009 Wolfson Microelectronics PLC. 9 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 10 */ 11 12 #include <linux/tty.h> 13 #include <linux/slab.h> 14 #include <linux/module.h> 15 #include <linux/regulator/consumer.h> 16 17 #include <sound/core.h> 18 #include <sound/initval.h> 19 #include <sound/soc.h> 20 21 #include "cx20442.h" 22 23 24 struct cx20442_priv { 25 struct tty_struct *tty; 26 struct regulator *por; 27 u8 reg_cache; 28 }; 29 30 #define CX20442_PM 0x0 31 32 #define CX20442_TELIN 0 33 #define CX20442_TELOUT 1 34 #define CX20442_MIC 2 35 #define CX20442_SPKOUT 3 36 #define CX20442_AGC 4 37 38 static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = { 39 SND_SOC_DAPM_OUTPUT("TELOUT"), 40 SND_SOC_DAPM_OUTPUT("SPKOUT"), 41 SND_SOC_DAPM_OUTPUT("AGCOUT"), 42 43 SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0), 44 45 SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0), 46 SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0), 47 SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0), 48 49 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), 50 SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0), 51 52 SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0), 53 54 SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0), 55 SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0), 56 57 SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0), 58 59 SND_SOC_DAPM_INPUT("TELIN"), 60 SND_SOC_DAPM_INPUT("MIC"), 61 SND_SOC_DAPM_INPUT("AGCIN"), 62 }; 63 64 static const struct snd_soc_dapm_route cx20442_audio_map[] = { 65 {"TELOUT", NULL, "TELOUT Amp"}, 66 67 {"SPKOUT", NULL, "SPKOUT Mixer"}, 68 {"SPKOUT Mixer", NULL, "SPKOUT Amp"}, 69 70 {"TELOUT Amp", NULL, "DAC"}, 71 {"SPKOUT Amp", NULL, "DAC"}, 72 73 {"SPKOUT Mixer", NULL, "SPKOUT AGC"}, 74 {"SPKOUT AGC", NULL, "AGCIN"}, 75 76 {"AGCOUT", NULL, "MIC AGC"}, 77 {"MIC AGC", NULL, "MIC"}, 78 79 {"MIC Bias", NULL, "MIC"}, 80 {"Input Mixer", NULL, "MIC Bias"}, 81 82 {"TELIN Bias", NULL, "TELIN"}, 83 {"Input Mixer", NULL, "TELIN Bias"}, 84 85 {"ADC", NULL, "Input Mixer"}, 86 }; 87 88 static unsigned int cx20442_read_reg_cache(struct snd_soc_component *component, 89 unsigned int reg) 90 { 91 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component); 92 93 if (reg >= 1) 94 return -EINVAL; 95 96 return cx20442->reg_cache; 97 } 98 99 enum v253_vls { 100 V253_VLS_NONE = 0, 101 V253_VLS_T, 102 V253_VLS_L, 103 V253_VLS_LT, 104 V253_VLS_S, 105 V253_VLS_ST, 106 V253_VLS_M, 107 V253_VLS_MST, 108 V253_VLS_S1, 109 V253_VLS_S1T, 110 V253_VLS_MS1T, 111 V253_VLS_M1, 112 V253_VLS_M1ST, 113 V253_VLS_M1S1T, 114 V253_VLS_H, 115 V253_VLS_HT, 116 V253_VLS_MS, 117 V253_VLS_MS1, 118 V253_VLS_M1S, 119 V253_VLS_M1S1, 120 V253_VLS_TEST, 121 }; 122 123 static int cx20442_pm_to_v253_vls(u8 value) 124 { 125 switch (value & ~(1 << CX20442_AGC)) { 126 case 0: 127 return V253_VLS_T; 128 case (1 << CX20442_SPKOUT): 129 case (1 << CX20442_MIC): 130 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC): 131 return V253_VLS_M1S1; 132 case (1 << CX20442_TELOUT): 133 case (1 << CX20442_TELIN): 134 case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN): 135 return V253_VLS_L; 136 case (1 << CX20442_TELOUT) | (1 << CX20442_MIC): 137 return V253_VLS_NONE; 138 } 139 return -EINVAL; 140 } 141 static int cx20442_pm_to_v253_vsp(u8 value) 142 { 143 switch (value & ~(1 << CX20442_AGC)) { 144 case (1 << CX20442_SPKOUT): 145 case (1 << CX20442_MIC): 146 case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC): 147 return (bool)(value & (1 << CX20442_AGC)); 148 } 149 return (value & (1 << CX20442_AGC)) ? -EINVAL : 0; 150 } 151 152 static int cx20442_write(struct snd_soc_component *component, unsigned int reg, 153 unsigned int value) 154 { 155 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component); 156 int vls, vsp, old, len; 157 char buf[18]; 158 159 if (reg >= 1) 160 return -EINVAL; 161 162 /* tty and write pointers required for talking to the modem 163 * are expected to be set by the line discipline initialization code */ 164 if (!cx20442->tty || !cx20442->tty->ops->write) 165 return -EIO; 166 167 old = cx20442->reg_cache; 168 cx20442->reg_cache = value; 169 170 vls = cx20442_pm_to_v253_vls(value); 171 if (vls < 0) 172 return vls; 173 174 vsp = cx20442_pm_to_v253_vsp(value); 175 if (vsp < 0) 176 return vsp; 177 178 if ((vls == V253_VLS_T) || 179 (vls == cx20442_pm_to_v253_vls(old))) { 180 if (vsp == cx20442_pm_to_v253_vsp(old)) 181 return 0; 182 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp); 183 } else if (vsp == cx20442_pm_to_v253_vsp(old)) 184 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls); 185 else 186 len = snprintf(buf, ARRAY_SIZE(buf), 187 "at+vls=%d;+vsp=%d\r", vls, vsp); 188 189 if (unlikely(len > (ARRAY_SIZE(buf) - 1))) 190 return -ENOMEM; 191 192 dev_dbg(component->dev, "%s: %s\n", __func__, buf); 193 if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len) 194 return -EIO; 195 196 return 0; 197 } 198 199 /* 200 * Line discpline related code 201 * 202 * Any of the callback functions below can be used in two ways: 203 * 1) registerd by a machine driver as one of line discipline operations, 204 * 2) called from a machine's provided line discipline callback function 205 * in case when extra machine specific code must be run as well. 206 */ 207 208 /* Modem init: echo off, digital speaker off, quiet off, voice mode */ 209 static const char v253_init[] = "ate0m0q0+fclass=8\r"; 210 211 /* Line discipline .open() */ 212 static int v253_open(struct tty_struct *tty) 213 { 214 int ret, len = strlen(v253_init); 215 216 /* Doesn't make sense without write callback */ 217 if (!tty->ops->write) 218 return -EINVAL; 219 220 /* Won't work if no codec pointer has been passed by a card driver */ 221 if (!tty->disc_data) 222 return -ENODEV; 223 224 tty->receive_room = 16; 225 if (tty->ops->write(tty, v253_init, len) != len) { 226 ret = -EIO; 227 goto err; 228 } 229 /* Actual setup will be performed after the modem responds. */ 230 return 0; 231 err: 232 tty->disc_data = NULL; 233 return ret; 234 } 235 236 /* Line discipline .close() */ 237 static void v253_close(struct tty_struct *tty) 238 { 239 struct snd_soc_component *component = tty->disc_data; 240 struct cx20442_priv *cx20442; 241 242 tty->disc_data = NULL; 243 244 if (!component) 245 return; 246 247 cx20442 = snd_soc_component_get_drvdata(component); 248 249 /* Prevent the codec driver from further accessing the modem */ 250 cx20442->tty = NULL; 251 component->card->pop_time = 0; 252 } 253 254 /* Line discipline .hangup() */ 255 static void v253_hangup(struct tty_struct *tty) 256 { 257 v253_close(tty); 258 } 259 260 /* Line discipline .receive_buf() */ 261 static void v253_receive(struct tty_struct *tty, const u8 *cp, const u8 *fp, 262 size_t count) 263 { 264 struct snd_soc_component *component = tty->disc_data; 265 struct cx20442_priv *cx20442; 266 267 if (!component) 268 return; 269 270 cx20442 = snd_soc_component_get_drvdata(component); 271 272 if (!cx20442->tty) { 273 /* First modem response, complete setup procedure */ 274 275 /* Set up codec driver access to modem controls */ 276 cx20442->tty = tty; 277 component->card->pop_time = 1; 278 } 279 } 280 281 struct tty_ldisc_ops v253_ops = { 282 .name = "cx20442", 283 .owner = THIS_MODULE, 284 .open = v253_open, 285 .close = v253_close, 286 .hangup = v253_hangup, 287 .receive_buf = v253_receive, 288 }; 289 EXPORT_SYMBOL_GPL(v253_ops); 290 291 292 /* 293 * Codec DAI 294 */ 295 296 static struct snd_soc_dai_driver cx20442_dai = { 297 .name = "cx20442-voice", 298 .playback = { 299 .stream_name = "Playback", 300 .channels_min = 1, 301 .channels_max = 1, 302 .rates = SNDRV_PCM_RATE_8000, 303 .formats = SNDRV_PCM_FMTBIT_S16_LE, 304 }, 305 .capture = { 306 .stream_name = "Capture", 307 .channels_min = 1, 308 .channels_max = 1, 309 .rates = SNDRV_PCM_RATE_8000, 310 .formats = SNDRV_PCM_FMTBIT_S16_LE, 311 }, 312 }; 313 314 static int cx20442_set_bias_level(struct snd_soc_component *component, 315 enum snd_soc_bias_level level) 316 { 317 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component); 318 int err = 0; 319 320 switch (level) { 321 case SND_SOC_BIAS_PREPARE: 322 if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_STANDBY) 323 break; 324 if (IS_ERR(cx20442->por)) 325 err = PTR_ERR(cx20442->por); 326 else 327 err = regulator_enable(cx20442->por); 328 break; 329 case SND_SOC_BIAS_STANDBY: 330 if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE) 331 break; 332 if (IS_ERR(cx20442->por)) 333 err = PTR_ERR(cx20442->por); 334 else 335 err = regulator_disable(cx20442->por); 336 break; 337 default: 338 break; 339 } 340 341 return err; 342 } 343 344 static int cx20442_component_probe(struct snd_soc_component *component) 345 { 346 struct cx20442_priv *cx20442; 347 348 cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL); 349 if (cx20442 == NULL) 350 return -ENOMEM; 351 352 cx20442->por = regulator_get(component->dev, "POR"); 353 if (IS_ERR(cx20442->por)) { 354 int err = PTR_ERR(cx20442->por); 355 356 dev_warn(component->dev, "failed to get POR supply (%d)", err); 357 /* 358 * When running on a non-dt platform and requested regulator 359 * is not available, regulator_get() never returns 360 * -EPROBE_DEFER as it is not able to justify if the regulator 361 * may still appear later. On the other hand, the board can 362 * still set full constraints flag at late_initcall in order 363 * to instruct regulator_get() to return a dummy one if 364 * sufficient. Hence, if we get -ENODEV here, let's convert 365 * it to -EPROBE_DEFER and wait for the board to decide or 366 * let Deferred Probe infrastructure handle this error. 367 */ 368 if (err == -ENODEV) 369 err = -EPROBE_DEFER; 370 kfree(cx20442); 371 return err; 372 } 373 374 cx20442->tty = NULL; 375 376 snd_soc_component_set_drvdata(component, cx20442); 377 component->card->pop_time = 0; 378 379 return 0; 380 } 381 382 /* power down chip */ 383 static void cx20442_component_remove(struct snd_soc_component *component) 384 { 385 struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component); 386 387 if (cx20442->tty) { 388 struct tty_struct *tty = cx20442->tty; 389 tty_hangup(tty); 390 } 391 392 if (!IS_ERR(cx20442->por)) { 393 /* should be already in STANDBY, hence disabled */ 394 regulator_put(cx20442->por); 395 } 396 397 snd_soc_component_set_drvdata(component, NULL); 398 kfree(cx20442); 399 } 400 401 static const struct snd_soc_component_driver cx20442_component_dev = { 402 .probe = cx20442_component_probe, 403 .remove = cx20442_component_remove, 404 .set_bias_level = cx20442_set_bias_level, 405 .read = cx20442_read_reg_cache, 406 .write = cx20442_write, 407 .dapm_widgets = cx20442_dapm_widgets, 408 .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets), 409 .dapm_routes = cx20442_audio_map, 410 .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map), 411 .idle_bias_on = 1, 412 .use_pmdown_time = 1, 413 .endianness = 1, 414 }; 415 416 static int cx20442_platform_probe(struct platform_device *pdev) 417 { 418 return devm_snd_soc_register_component(&pdev->dev, 419 &cx20442_component_dev, &cx20442_dai, 1); 420 } 421 422 static struct platform_driver cx20442_platform_driver = { 423 .driver = { 424 .name = "cx20442-codec", 425 }, 426 .probe = cx20442_platform_probe, 427 }; 428 429 module_platform_driver(cx20442_platform_driver); 430 431 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver"); 432 MODULE_AUTHOR("Janusz Krzysztofik"); 433 MODULE_LICENSE("GPL"); 434 MODULE_ALIAS("platform:cx20442-codec"); 435