Lars-Peter Clausen | 336b842 | 2014-11-10 22:41:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * soc-ac97.c -- ALSA SoC Audio Layer AC97 support |
| 3 | * |
| 4 | * Copyright 2005 Wolfson Microelectronics PLC. |
| 5 | * Copyright 2005 Openedhand Ltd. |
| 6 | * Copyright (C) 2010 Slimlogic Ltd. |
| 7 | * Copyright (C) 2010 Texas Instruments Inc. |
| 8 | * |
| 9 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
| 10 | * with code, comments and ideas from :- |
| 11 | * Richard Purdie <richard@openedhand.com> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify it |
| 14 | * under the terms of the GNU General Public License as published by the |
| 15 | * Free Software Foundation; either version 2 of the License, or (at your |
| 16 | * option) any later version. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/ctype.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/export.h> |
| 22 | #include <linux/gpio.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/of_gpio.h> |
| 25 | #include <linux/of.h> |
| 26 | #include <linux/pinctrl/consumer.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <sound/ac97_codec.h> |
| 29 | #include <sound/soc.h> |
| 30 | |
| 31 | struct snd_ac97_reset_cfg { |
| 32 | struct pinctrl *pctl; |
| 33 | struct pinctrl_state *pstate_reset; |
| 34 | struct pinctrl_state *pstate_warm_reset; |
| 35 | struct pinctrl_state *pstate_run; |
| 36 | int gpio_sdata; |
| 37 | int gpio_sync; |
| 38 | int gpio_reset; |
| 39 | }; |
| 40 | |
Lars-Peter Clausen | eda1a70 | 2014-11-10 22:41:47 +0100 | [diff] [blame^] | 41 | static struct snd_ac97_bus soc_ac97_bus = { |
| 42 | .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ |
| 43 | }; |
| 44 | |
Lars-Peter Clausen | 336b842 | 2014-11-10 22:41:46 +0100 | [diff] [blame] | 45 | /* unregister ac97 codec */ |
| 46 | static int soc_ac97_dev_unregister(struct snd_soc_codec *codec) |
| 47 | { |
| 48 | if (codec->ac97->dev.bus) |
| 49 | device_del(&codec->ac97->dev); |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | /* register ac97 codec to bus */ |
| 54 | static int soc_ac97_dev_register(struct snd_soc_codec *codec) |
| 55 | { |
| 56 | int err; |
| 57 | |
| 58 | codec->ac97->dev.bus = &ac97_bus_type; |
| 59 | codec->ac97->dev.parent = codec->component.card->dev; |
| 60 | |
| 61 | dev_set_name(&codec->ac97->dev, "%d-%d:%s", |
| 62 | codec->component.card->snd_card->number, 0, |
| 63 | codec->component.name); |
| 64 | err = device_add(&codec->ac97->dev); |
| 65 | if (err < 0) { |
| 66 | dev_err(codec->dev, "ASoC: Can't register ac97 bus\n"); |
| 67 | codec->ac97->dev.bus = NULL; |
| 68 | return err; |
| 69 | } |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static int soc_register_ac97_codec(struct snd_soc_codec *codec, |
| 74 | struct snd_soc_dai *codec_dai) |
| 75 | { |
| 76 | int ret; |
| 77 | |
| 78 | /* Only instantiate AC97 if not already done by the adaptor |
| 79 | * for the generic AC97 subsystem. |
| 80 | */ |
| 81 | if (codec_dai->driver->ac97_control && !codec->ac97_registered) { |
| 82 | /* |
| 83 | * It is possible that the AC97 device is already registered to |
| 84 | * the device subsystem. This happens when the device is created |
| 85 | * via snd_ac97_mixer(). Currently only SoC codec that does so |
| 86 | * is the generic AC97 glue but others migh emerge. |
| 87 | * |
| 88 | * In those cases we don't try to register the device again. |
| 89 | */ |
| 90 | if (!codec->ac97_created) |
| 91 | return 0; |
| 92 | |
| 93 | ret = soc_ac97_dev_register(codec); |
| 94 | if (ret < 0) { |
| 95 | dev_err(codec->dev, |
| 96 | "ASoC: AC97 device register failed: %d\n", ret); |
| 97 | return ret; |
| 98 | } |
| 99 | |
| 100 | codec->ac97_registered = 1; |
| 101 | } |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static void soc_unregister_ac97_codec(struct snd_soc_codec *codec) |
| 106 | { |
| 107 | if (codec->ac97_registered) { |
| 108 | soc_ac97_dev_unregister(codec); |
| 109 | codec->ac97_registered = 0; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | static int soc_register_ac97_dai_link(struct snd_soc_pcm_runtime *rtd) |
| 114 | { |
| 115 | int i, ret; |
| 116 | |
| 117 | for (i = 0; i < rtd->num_codecs; i++) { |
| 118 | struct snd_soc_dai *codec_dai = rtd->codec_dais[i]; |
| 119 | |
| 120 | ret = soc_register_ac97_codec(codec_dai->codec, codec_dai); |
| 121 | if (ret) { |
| 122 | while (--i >= 0) |
| 123 | soc_unregister_ac97_codec(codec_dai->codec); |
| 124 | return ret; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static void soc_unregister_ac97_dai_link(struct snd_soc_pcm_runtime *rtd) |
| 132 | { |
| 133 | int i; |
| 134 | |
| 135 | for (i = 0; i < rtd->num_codecs; i++) |
| 136 | soc_unregister_ac97_codec(rtd->codec_dais[i]->codec); |
| 137 | } |
| 138 | |
| 139 | static void soc_ac97_device_release(struct device *dev) |
| 140 | { |
| 141 | kfree(to_ac97_t(dev)); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * snd_soc_new_ac97_codec - initailise AC97 device |
| 146 | * @codec: audio codec |
Lars-Peter Clausen | 336b842 | 2014-11-10 22:41:46 +0100 | [diff] [blame] | 147 | * |
| 148 | * Initialises AC97 codec resources for use by ad-hoc devices only. |
| 149 | */ |
Lars-Peter Clausen | eda1a70 | 2014-11-10 22:41:47 +0100 | [diff] [blame^] | 150 | int snd_soc_new_ac97_codec(struct snd_soc_codec *codec) |
Lars-Peter Clausen | 336b842 | 2014-11-10 22:41:46 +0100 | [diff] [blame] | 151 | { |
| 152 | codec->ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); |
| 153 | if (codec->ac97 == NULL) |
| 154 | return -ENOMEM; |
| 155 | |
Lars-Peter Clausen | eda1a70 | 2014-11-10 22:41:47 +0100 | [diff] [blame^] | 156 | codec->ac97->bus = &soc_ac97_bus; |
| 157 | codec->ac97->num = 0; |
Lars-Peter Clausen | 336b842 | 2014-11-10 22:41:46 +0100 | [diff] [blame] | 158 | codec->ac97->dev.release = soc_ac97_device_release; |
| 159 | |
| 160 | /* |
| 161 | * Mark the AC97 device to be created by us. This way we ensure that the |
| 162 | * device will be registered with the device subsystem later on. |
| 163 | */ |
| 164 | codec->ac97_created = 1; |
| 165 | device_initialize(&codec->ac97->dev); |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec); |
| 170 | |
| 171 | /** |
| 172 | * snd_soc_free_ac97_codec - free AC97 codec device |
| 173 | * @codec: audio codec |
| 174 | * |
| 175 | * Frees AC97 codec device resources. |
| 176 | */ |
| 177 | void snd_soc_free_ac97_codec(struct snd_soc_codec *codec) |
| 178 | { |
| 179 | soc_unregister_ac97_codec(codec); |
Lars-Peter Clausen | 336b842 | 2014-11-10 22:41:46 +0100 | [diff] [blame] | 180 | codec->ac97->bus = NULL; |
| 181 | put_device(&codec->ac97->dev); |
| 182 | codec->ac97 = NULL; |
| 183 | codec->ac97_created = 0; |
| 184 | } |
| 185 | EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec); |
| 186 | |
| 187 | static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; |
| 188 | |
| 189 | static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) |
| 190 | { |
| 191 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; |
| 192 | |
| 193 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); |
| 194 | |
| 195 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); |
| 196 | |
| 197 | udelay(10); |
| 198 | |
| 199 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); |
| 200 | |
| 201 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); |
| 202 | msleep(2); |
| 203 | } |
| 204 | |
| 205 | static void snd_soc_ac97_reset(struct snd_ac97 *ac97) |
| 206 | { |
| 207 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; |
| 208 | |
| 209 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); |
| 210 | |
| 211 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); |
| 212 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); |
| 213 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); |
| 214 | |
| 215 | udelay(10); |
| 216 | |
| 217 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); |
| 218 | |
| 219 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); |
| 220 | msleep(2); |
| 221 | } |
| 222 | |
| 223 | static int snd_soc_ac97_parse_pinctl(struct device *dev, |
| 224 | struct snd_ac97_reset_cfg *cfg) |
| 225 | { |
| 226 | struct pinctrl *p; |
| 227 | struct pinctrl_state *state; |
| 228 | int gpio; |
| 229 | int ret; |
| 230 | |
| 231 | p = devm_pinctrl_get(dev); |
| 232 | if (IS_ERR(p)) { |
| 233 | dev_err(dev, "Failed to get pinctrl\n"); |
| 234 | return PTR_ERR(p); |
| 235 | } |
| 236 | cfg->pctl = p; |
| 237 | |
| 238 | state = pinctrl_lookup_state(p, "ac97-reset"); |
| 239 | if (IS_ERR(state)) { |
| 240 | dev_err(dev, "Can't find pinctrl state ac97-reset\n"); |
| 241 | return PTR_ERR(state); |
| 242 | } |
| 243 | cfg->pstate_reset = state; |
| 244 | |
| 245 | state = pinctrl_lookup_state(p, "ac97-warm-reset"); |
| 246 | if (IS_ERR(state)) { |
| 247 | dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); |
| 248 | return PTR_ERR(state); |
| 249 | } |
| 250 | cfg->pstate_warm_reset = state; |
| 251 | |
| 252 | state = pinctrl_lookup_state(p, "ac97-running"); |
| 253 | if (IS_ERR(state)) { |
| 254 | dev_err(dev, "Can't find pinctrl state ac97-running\n"); |
| 255 | return PTR_ERR(state); |
| 256 | } |
| 257 | cfg->pstate_run = state; |
| 258 | |
| 259 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); |
| 260 | if (gpio < 0) { |
| 261 | dev_err(dev, "Can't find ac97-sync gpio\n"); |
| 262 | return gpio; |
| 263 | } |
| 264 | ret = devm_gpio_request(dev, gpio, "AC97 link sync"); |
| 265 | if (ret) { |
| 266 | dev_err(dev, "Failed requesting ac97-sync gpio\n"); |
| 267 | return ret; |
| 268 | } |
| 269 | cfg->gpio_sync = gpio; |
| 270 | |
| 271 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); |
| 272 | if (gpio < 0) { |
| 273 | dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); |
| 274 | return gpio; |
| 275 | } |
| 276 | ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); |
| 277 | if (ret) { |
| 278 | dev_err(dev, "Failed requesting ac97-sdata gpio\n"); |
| 279 | return ret; |
| 280 | } |
| 281 | cfg->gpio_sdata = gpio; |
| 282 | |
| 283 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); |
| 284 | if (gpio < 0) { |
| 285 | dev_err(dev, "Can't find ac97-reset gpio\n"); |
| 286 | return gpio; |
| 287 | } |
| 288 | ret = devm_gpio_request(dev, gpio, "AC97 link reset"); |
| 289 | if (ret) { |
| 290 | dev_err(dev, "Failed requesting ac97-reset gpio\n"); |
| 291 | return ret; |
| 292 | } |
| 293 | cfg->gpio_reset = gpio; |
| 294 | |
| 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | struct snd_ac97_bus_ops *soc_ac97_ops; |
| 299 | EXPORT_SYMBOL_GPL(soc_ac97_ops); |
| 300 | |
| 301 | int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) |
| 302 | { |
| 303 | if (ops == soc_ac97_ops) |
| 304 | return 0; |
| 305 | |
| 306 | if (soc_ac97_ops && ops) |
| 307 | return -EBUSY; |
| 308 | |
| 309 | soc_ac97_ops = ops; |
Lars-Peter Clausen | eda1a70 | 2014-11-10 22:41:47 +0100 | [diff] [blame^] | 310 | soc_ac97_bus.ops = ops; |
Lars-Peter Clausen | 336b842 | 2014-11-10 22:41:46 +0100 | [diff] [blame] | 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); |
| 315 | |
| 316 | /** |
| 317 | * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions |
| 318 | * |
| 319 | * This function sets the reset and warm_reset properties of ops and parses |
| 320 | * the device node of pdev to get pinctrl states and gpio numbers to use. |
| 321 | */ |
| 322 | int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, |
| 323 | struct platform_device *pdev) |
| 324 | { |
| 325 | struct device *dev = &pdev->dev; |
| 326 | struct snd_ac97_reset_cfg cfg; |
| 327 | int ret; |
| 328 | |
| 329 | ret = snd_soc_ac97_parse_pinctl(dev, &cfg); |
| 330 | if (ret) |
| 331 | return ret; |
| 332 | |
| 333 | ret = snd_soc_set_ac97_ops(ops); |
| 334 | if (ret) |
| 335 | return ret; |
| 336 | |
| 337 | ops->warm_reset = snd_soc_ac97_warm_reset; |
| 338 | ops->reset = snd_soc_ac97_reset; |
| 339 | |
| 340 | snd_ac97_rst_cfg = cfg; |
| 341 | return 0; |
| 342 | } |
| 343 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); |
| 344 | |
| 345 | int snd_soc_ac97_register_dai_links(struct snd_soc_card *card) |
| 346 | { |
| 347 | int i; |
| 348 | int ret; |
| 349 | |
| 350 | /* register any AC97 codecs */ |
| 351 | for (i = 0; i < card->num_rtd; i++) { |
| 352 | ret = soc_register_ac97_dai_link(&card->rtd[i]); |
| 353 | if (ret < 0) |
| 354 | goto err; |
| 355 | } |
| 356 | |
| 357 | return 0; |
| 358 | err: |
| 359 | dev_err(card->dev, |
| 360 | "ASoC: failed to register AC97: %d\n", ret); |
| 361 | while (--i >= 0) |
| 362 | soc_unregister_ac97_dai_link(&card->rtd[i]); |
| 363 | return ret; |
| 364 | } |
| 365 | |
| 366 | void snd_soc_ac97_add_pdata(struct snd_soc_pcm_runtime *rtd) |
| 367 | { |
| 368 | unsigned int i; |
| 369 | |
| 370 | /* add platform data for AC97 devices */ |
| 371 | for (i = 0; i < rtd->num_codecs; i++) { |
| 372 | if (rtd->codec_dais[i]->driver->ac97_control) |
| 373 | snd_ac97_dev_add_pdata(rtd->codec_dais[i]->codec->ac97, |
| 374 | rtd->cpu_dai->ac97_pdata); |
| 375 | } |
| 376 | } |