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/gpio/driver.h> 24 #include <linux/init.h> 25 #include <linux/of_gpio.h> 26 #include <linux/of.h> 27 #include <linux/pinctrl/consumer.h> 28 #include <linux/slab.h> 29 #include <sound/ac97_codec.h> 30 #include <sound/soc.h> 31 32 struct snd_ac97_reset_cfg { 33 struct pinctrl *pctl; 34 struct pinctrl_state *pstate_reset; 35 struct pinctrl_state *pstate_warm_reset; 36 struct pinctrl_state *pstate_run; 37 int gpio_sdata; 38 int gpio_sync; 39 int gpio_reset; 40 }; 41 42 struct snd_ac97_gpio_priv { 43 #ifdef CONFIG_GPIOLIB 44 struct gpio_chip gpio_chip; 45 #endif 46 unsigned int gpios_set; 47 struct snd_soc_codec *codec; 48 }; 49 50 static struct snd_ac97_bus soc_ac97_bus = { 51 .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ 52 }; 53 54 static void soc_ac97_device_release(struct device *dev) 55 { 56 kfree(to_ac97_t(dev)); 57 } 58 59 #ifdef CONFIG_GPIOLIB 60 static inline struct snd_soc_codec *gpio_to_codec(struct gpio_chip *chip) 61 { 62 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip); 63 64 return gpio_priv->codec; 65 } 66 67 static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned offset) 68 { 69 if (offset >= AC97_NUM_GPIOS) 70 return -EINVAL; 71 72 return 0; 73 } 74 75 static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip, 76 unsigned offset) 77 { 78 struct snd_soc_codec *codec = gpio_to_codec(chip); 79 80 dev_dbg(codec->dev, "set gpio %d to output\n", offset); 81 return snd_soc_update_bits(codec, AC97_GPIO_CFG, 82 1 << offset, 1 << offset); 83 } 84 85 static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned offset) 86 { 87 struct snd_soc_codec *codec = gpio_to_codec(chip); 88 int ret; 89 90 ret = snd_soc_read(codec, AC97_GPIO_STATUS); 91 dev_dbg(codec->dev, "get gpio %d : %d\n", offset, 92 ret < 0 ? ret : ret & (1 << offset)); 93 94 return ret < 0 ? ret : !!(ret & (1 << offset)); 95 } 96 97 static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned offset, 98 int value) 99 { 100 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip); 101 struct snd_soc_codec *codec = gpio_to_codec(chip); 102 103 gpio_priv->gpios_set &= ~(1 << offset); 104 gpio_priv->gpios_set |= (!!value) << offset; 105 snd_soc_write(codec, AC97_GPIO_STATUS, gpio_priv->gpios_set); 106 dev_dbg(codec->dev, "set gpio %d to %d\n", offset, !!value); 107 } 108 109 static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip, 110 unsigned offset, int value) 111 { 112 struct snd_soc_codec *codec = gpio_to_codec(chip); 113 114 dev_dbg(codec->dev, "set gpio %d to output\n", offset); 115 snd_soc_ac97_gpio_set(chip, offset, value); 116 return snd_soc_update_bits(codec, AC97_GPIO_CFG, 1 << offset, 0); 117 } 118 119 static const struct gpio_chip snd_soc_ac97_gpio_chip = { 120 .label = "snd_soc_ac97", 121 .owner = THIS_MODULE, 122 .request = snd_soc_ac97_gpio_request, 123 .direction_input = snd_soc_ac97_gpio_direction_in, 124 .get = snd_soc_ac97_gpio_get, 125 .direction_output = snd_soc_ac97_gpio_direction_out, 126 .set = snd_soc_ac97_gpio_set, 127 .can_sleep = 1, 128 }; 129 130 static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, 131 struct snd_soc_codec *codec) 132 { 133 struct snd_ac97_gpio_priv *gpio_priv; 134 int ret; 135 136 gpio_priv = devm_kzalloc(codec->dev, sizeof(*gpio_priv), GFP_KERNEL); 137 if (!gpio_priv) 138 return -ENOMEM; 139 ac97->gpio_priv = gpio_priv; 140 gpio_priv->codec = codec; 141 gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip; 142 gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS; 143 gpio_priv->gpio_chip.parent = codec->dev; 144 gpio_priv->gpio_chip.base = -1; 145 146 ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv); 147 if (ret != 0) 148 dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret); 149 return ret; 150 } 151 152 static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) 153 { 154 gpiochip_remove(&ac97->gpio_priv->gpio_chip); 155 } 156 #else 157 static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, 158 struct snd_soc_codec *codec) 159 { 160 return 0; 161 } 162 163 static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) 164 { 165 } 166 #endif 167 168 /** 169 * snd_soc_alloc_ac97_codec() - Allocate new a AC'97 device 170 * @codec: The CODEC for which to create the AC'97 device 171 * 172 * Allocated a new snd_ac97 device and intializes it, but does not yet register 173 * it. The caller is responsible to either call device_add(&ac97->dev) to 174 * register the device, or to call put_device(&ac97->dev) to free the device. 175 * 176 * Returns: A snd_ac97 device or a PTR_ERR in case of an error. 177 */ 178 struct snd_ac97 *snd_soc_alloc_ac97_codec(struct snd_soc_codec *codec) 179 { 180 struct snd_ac97 *ac97; 181 182 ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); 183 if (ac97 == NULL) 184 return ERR_PTR(-ENOMEM); 185 186 ac97->bus = &soc_ac97_bus; 187 ac97->num = 0; 188 189 ac97->dev.bus = &ac97_bus_type; 190 ac97->dev.parent = codec->component.card->dev; 191 ac97->dev.release = soc_ac97_device_release; 192 193 dev_set_name(&ac97->dev, "%d-%d:%s", 194 codec->component.card->snd_card->number, 0, 195 codec->component.name); 196 197 device_initialize(&ac97->dev); 198 199 return ac97; 200 } 201 EXPORT_SYMBOL(snd_soc_alloc_ac97_codec); 202 203 /** 204 * snd_soc_new_ac97_codec - initailise AC97 device 205 * @codec: audio codec 206 * @id: The expected device ID 207 * @id_mask: Mask that is applied to the device ID before comparing with @id 208 * 209 * Initialises AC97 codec resources for use by ad-hoc devices only. 210 * 211 * If @id is not 0 this function will reset the device, then read the ID from 212 * the device and check if it matches the expected ID. If it doesn't match an 213 * error will be returned and device will not be registered. 214 * 215 * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success. 216 */ 217 struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec, 218 unsigned int id, unsigned int id_mask) 219 { 220 struct snd_ac97 *ac97; 221 int ret; 222 223 ac97 = snd_soc_alloc_ac97_codec(codec); 224 if (IS_ERR(ac97)) 225 return ac97; 226 227 if (id) { 228 ret = snd_ac97_reset(ac97, false, id, id_mask); 229 if (ret < 0) { 230 dev_err(codec->dev, "Failed to reset AC97 device: %d\n", 231 ret); 232 goto err_put_device; 233 } 234 } 235 236 ret = device_add(&ac97->dev); 237 if (ret) 238 goto err_put_device; 239 240 ret = snd_soc_ac97_init_gpio(ac97, codec); 241 if (ret) 242 goto err_put_device; 243 244 return ac97; 245 246 err_put_device: 247 put_device(&ac97->dev); 248 return ERR_PTR(ret); 249 } 250 EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec); 251 252 /** 253 * snd_soc_free_ac97_codec - free AC97 codec device 254 * @codec: audio codec 255 * 256 * Frees AC97 codec device resources. 257 */ 258 void snd_soc_free_ac97_codec(struct snd_ac97 *ac97) 259 { 260 snd_soc_ac97_free_gpio(ac97); 261 device_del(&ac97->dev); 262 ac97->bus = NULL; 263 put_device(&ac97->dev); 264 } 265 EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec); 266 267 static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; 268 269 static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) 270 { 271 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; 272 273 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); 274 275 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); 276 277 udelay(10); 278 279 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); 280 281 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); 282 msleep(2); 283 } 284 285 static void snd_soc_ac97_reset(struct snd_ac97 *ac97) 286 { 287 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; 288 289 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); 290 291 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); 292 gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); 293 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); 294 295 udelay(10); 296 297 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); 298 299 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); 300 msleep(2); 301 } 302 303 static int snd_soc_ac97_parse_pinctl(struct device *dev, 304 struct snd_ac97_reset_cfg *cfg) 305 { 306 struct pinctrl *p; 307 struct pinctrl_state *state; 308 int gpio; 309 int ret; 310 311 p = devm_pinctrl_get(dev); 312 if (IS_ERR(p)) { 313 dev_err(dev, "Failed to get pinctrl\n"); 314 return PTR_ERR(p); 315 } 316 cfg->pctl = p; 317 318 state = pinctrl_lookup_state(p, "ac97-reset"); 319 if (IS_ERR(state)) { 320 dev_err(dev, "Can't find pinctrl state ac97-reset\n"); 321 return PTR_ERR(state); 322 } 323 cfg->pstate_reset = state; 324 325 state = pinctrl_lookup_state(p, "ac97-warm-reset"); 326 if (IS_ERR(state)) { 327 dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); 328 return PTR_ERR(state); 329 } 330 cfg->pstate_warm_reset = state; 331 332 state = pinctrl_lookup_state(p, "ac97-running"); 333 if (IS_ERR(state)) { 334 dev_err(dev, "Can't find pinctrl state ac97-running\n"); 335 return PTR_ERR(state); 336 } 337 cfg->pstate_run = state; 338 339 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); 340 if (gpio < 0) { 341 dev_err(dev, "Can't find ac97-sync gpio\n"); 342 return gpio; 343 } 344 ret = devm_gpio_request(dev, gpio, "AC97 link sync"); 345 if (ret) { 346 dev_err(dev, "Failed requesting ac97-sync gpio\n"); 347 return ret; 348 } 349 cfg->gpio_sync = gpio; 350 351 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); 352 if (gpio < 0) { 353 dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); 354 return gpio; 355 } 356 ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); 357 if (ret) { 358 dev_err(dev, "Failed requesting ac97-sdata gpio\n"); 359 return ret; 360 } 361 cfg->gpio_sdata = gpio; 362 363 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); 364 if (gpio < 0) { 365 dev_err(dev, "Can't find ac97-reset gpio\n"); 366 return gpio; 367 } 368 ret = devm_gpio_request(dev, gpio, "AC97 link reset"); 369 if (ret) { 370 dev_err(dev, "Failed requesting ac97-reset gpio\n"); 371 return ret; 372 } 373 cfg->gpio_reset = gpio; 374 375 return 0; 376 } 377 378 struct snd_ac97_bus_ops *soc_ac97_ops; 379 EXPORT_SYMBOL_GPL(soc_ac97_ops); 380 381 int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) 382 { 383 if (ops == soc_ac97_ops) 384 return 0; 385 386 if (soc_ac97_ops && ops) 387 return -EBUSY; 388 389 soc_ac97_ops = ops; 390 soc_ac97_bus.ops = ops; 391 392 return 0; 393 } 394 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); 395 396 /** 397 * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions 398 * 399 * This function sets the reset and warm_reset properties of ops and parses 400 * the device node of pdev to get pinctrl states and gpio numbers to use. 401 */ 402 int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, 403 struct platform_device *pdev) 404 { 405 struct device *dev = &pdev->dev; 406 struct snd_ac97_reset_cfg cfg; 407 int ret; 408 409 ret = snd_soc_ac97_parse_pinctl(dev, &cfg); 410 if (ret) 411 return ret; 412 413 ret = snd_soc_set_ac97_ops(ops); 414 if (ret) 415 return ret; 416 417 ops->warm_reset = snd_soc_ac97_warm_reset; 418 ops->reset = snd_soc_ac97_reset; 419 420 snd_ac97_rst_cfg = cfg; 421 return 0; 422 } 423 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); 424