1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // soc-ac97.c -- ALSA SoC Audio Layer AC97 support 4 // 5 // Copyright 2005 Wolfson Microelectronics PLC. 6 // Copyright 2005 Openedhand Ltd. 7 // Copyright (C) 2010 Slimlogic Ltd. 8 // Copyright (C) 2010 Texas Instruments Inc. 9 // 10 // Author: Liam Girdwood <lrg@slimlogic.co.uk> 11 // with code, comments and ideas from :- 12 // Richard Purdie <richard@openedhand.com> 13 14 #include <linux/ctype.h> 15 #include <linux/delay.h> 16 #include <linux/export.h> 17 #include <linux/gpio/consumer.h> 18 #include <linux/gpio/driver.h> 19 #include <linux/init.h> 20 #include <linux/of.h> 21 #include <linux/pinctrl/consumer.h> 22 #include <linux/slab.h> 23 #include <sound/ac97_codec.h> 24 #include <sound/soc.h> 25 26 struct snd_ac97_reset_cfg { 27 struct pinctrl *pctl; 28 struct pinctrl_state *pstate_reset; 29 struct pinctrl_state *pstate_warm_reset; 30 struct pinctrl_state *pstate_run; 31 struct gpio_desc *reset_gpio; 32 struct gpio_desc *sdata_gpio; 33 struct gpio_desc *sync_gpio; 34 }; 35 36 static struct snd_ac97_bus soc_ac97_bus = { 37 .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ 38 }; 39 40 static void soc_ac97_device_release(struct device *dev) 41 { 42 kfree(to_ac97_t(dev)); 43 } 44 45 #ifdef CONFIG_GPIOLIB 46 struct snd_ac97_gpio_priv { 47 struct gpio_chip gpio_chip; 48 unsigned int gpios_set; 49 struct snd_soc_component *component; 50 }; 51 52 static inline struct snd_soc_component *gpio_to_component(struct gpio_chip *chip) 53 { 54 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip); 55 56 return gpio_priv->component; 57 } 58 59 static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned int offset) 60 { 61 if (offset >= AC97_NUM_GPIOS) 62 return -EINVAL; 63 64 return 0; 65 } 66 67 static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip, 68 unsigned int offset) 69 { 70 struct snd_soc_component *component = gpio_to_component(chip); 71 72 dev_dbg(component->dev, "set gpio %d to output\n", offset); 73 return snd_soc_component_update_bits(component, AC97_GPIO_CFG, 74 1 << offset, 1 << offset); 75 } 76 77 static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned int offset) 78 { 79 struct snd_soc_component *component = gpio_to_component(chip); 80 int ret; 81 82 ret = snd_soc_component_read(component, AC97_GPIO_STATUS); 83 84 dev_dbg(component->dev, "get gpio %d : %d\n", offset, 85 ret & (1 << offset)); 86 87 return !!(ret & (1 << offset)); 88 } 89 90 static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned int offset, 91 int value) 92 { 93 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip); 94 struct snd_soc_component *component = gpio_to_component(chip); 95 96 gpio_priv->gpios_set &= ~(1 << offset); 97 gpio_priv->gpios_set |= (!!value) << offset; 98 snd_soc_component_write(component, AC97_GPIO_STATUS, 99 gpio_priv->gpios_set); 100 dev_dbg(component->dev, "set gpio %d to %d\n", offset, !!value); 101 } 102 103 static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip, 104 unsigned offset, int value) 105 { 106 struct snd_soc_component *component = gpio_to_component(chip); 107 108 dev_dbg(component->dev, "set gpio %d to output\n", offset); 109 snd_soc_ac97_gpio_set(chip, offset, value); 110 return snd_soc_component_update_bits(component, AC97_GPIO_CFG, 111 1 << offset, 0); 112 } 113 114 static const struct gpio_chip snd_soc_ac97_gpio_chip = { 115 .label = "snd_soc_ac97", 116 .owner = THIS_MODULE, 117 .request = snd_soc_ac97_gpio_request, 118 .direction_input = snd_soc_ac97_gpio_direction_in, 119 .get = snd_soc_ac97_gpio_get, 120 .direction_output = snd_soc_ac97_gpio_direction_out, 121 .set = snd_soc_ac97_gpio_set, 122 .can_sleep = 1, 123 }; 124 125 static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, 126 struct snd_soc_component *component) 127 { 128 struct snd_ac97_gpio_priv *gpio_priv; 129 int ret; 130 131 gpio_priv = devm_kzalloc(component->dev, sizeof(*gpio_priv), GFP_KERNEL); 132 if (!gpio_priv) 133 return -ENOMEM; 134 ac97->gpio_priv = gpio_priv; 135 gpio_priv->component = component; 136 gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip; 137 gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS; 138 gpio_priv->gpio_chip.parent = component->dev; 139 gpio_priv->gpio_chip.base = -1; 140 141 ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv); 142 if (ret != 0) 143 dev_err(component->dev, "Failed to add GPIOs: %d\n", ret); 144 return ret; 145 } 146 147 static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) 148 { 149 gpiochip_remove(&ac97->gpio_priv->gpio_chip); 150 } 151 #else 152 static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, 153 struct snd_soc_component *component) 154 { 155 return 0; 156 } 157 158 static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) 159 { 160 } 161 #endif 162 163 /** 164 * snd_soc_alloc_ac97_component() - Allocate new a AC'97 device 165 * @component: The COMPONENT for which to create the AC'97 device 166 * 167 * Allocated a new snd_ac97 device and intializes it, but does not yet register 168 * it. The caller is responsible to either call device_add(&ac97->dev) to 169 * register the device, or to call put_device(&ac97->dev) to free the device. 170 * 171 * Returns: A snd_ac97 device or a PTR_ERR in case of an error. 172 */ 173 struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component) 174 { 175 struct snd_ac97 *ac97; 176 177 ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); 178 if (ac97 == NULL) 179 return ERR_PTR(-ENOMEM); 180 181 ac97->bus = &soc_ac97_bus; 182 ac97->num = 0; 183 184 ac97->dev.bus = &ac97_bus_type; 185 ac97->dev.parent = component->card->dev; 186 ac97->dev.release = soc_ac97_device_release; 187 188 dev_set_name(&ac97->dev, "%d-%d:%s", 189 component->card->snd_card->number, 0, 190 component->name); 191 192 device_initialize(&ac97->dev); 193 194 return ac97; 195 } 196 EXPORT_SYMBOL(snd_soc_alloc_ac97_component); 197 198 /** 199 * snd_soc_new_ac97_component - initailise AC97 device 200 * @component: audio component 201 * @id: The expected device ID 202 * @id_mask: Mask that is applied to the device ID before comparing with @id 203 * 204 * Initialises AC97 component resources for use by ad-hoc devices only. 205 * 206 * If @id is not 0 this function will reset the device, then read the ID from 207 * the device and check if it matches the expected ID. If it doesn't match an 208 * error will be returned and device will not be registered. 209 * 210 * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success. 211 */ 212 struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component, 213 unsigned int id, unsigned int id_mask) 214 { 215 struct snd_ac97 *ac97; 216 int ret; 217 218 ac97 = snd_soc_alloc_ac97_component(component); 219 if (IS_ERR(ac97)) 220 return ac97; 221 222 if (id) { 223 ret = snd_ac97_reset(ac97, false, id, id_mask); 224 if (ret < 0) { 225 dev_err(component->dev, "Failed to reset AC97 device: %d\n", 226 ret); 227 goto err_put_device; 228 } 229 } 230 231 ret = device_add(&ac97->dev); 232 if (ret) 233 goto err_put_device; 234 235 ret = snd_soc_ac97_init_gpio(ac97, component); 236 if (ret) 237 goto err_put_device; 238 239 return ac97; 240 241 err_put_device: 242 put_device(&ac97->dev); 243 return ERR_PTR(ret); 244 } 245 EXPORT_SYMBOL_GPL(snd_soc_new_ac97_component); 246 247 /** 248 * snd_soc_free_ac97_component - free AC97 component device 249 * @ac97: snd_ac97 device to be freed 250 * 251 * Frees AC97 component device resources. 252 */ 253 void snd_soc_free_ac97_component(struct snd_ac97 *ac97) 254 { 255 snd_soc_ac97_free_gpio(ac97); 256 device_del(&ac97->dev); 257 ac97->bus = NULL; 258 put_device(&ac97->dev); 259 } 260 EXPORT_SYMBOL_GPL(snd_soc_free_ac97_component); 261 262 static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; 263 264 static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) 265 { 266 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; 267 268 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); 269 270 gpiod_direction_output_raw(snd_ac97_rst_cfg.sync_gpio, 1); 271 272 udelay(10); 273 274 gpiod_direction_output_raw(snd_ac97_rst_cfg.sync_gpio, 0); 275 276 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); 277 msleep(2); 278 } 279 280 static void snd_soc_ac97_reset(struct snd_ac97 *ac97) 281 { 282 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; 283 284 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); 285 286 gpiod_direction_output_raw(snd_ac97_rst_cfg.sync_gpio, 0); 287 gpiod_direction_output_raw(snd_ac97_rst_cfg.sdata_gpio, 0); 288 gpiod_direction_output_raw(snd_ac97_rst_cfg.reset_gpio, 0); 289 290 udelay(10); 291 292 gpiod_direction_output_raw(snd_ac97_rst_cfg.reset_gpio, 1); 293 294 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); 295 msleep(2); 296 } 297 298 static int snd_soc_ac97_parse_pinctl(struct device *dev, 299 struct snd_ac97_reset_cfg *cfg) 300 { 301 struct pinctrl *p; 302 struct pinctrl_state *state; 303 304 p = devm_pinctrl_get(dev); 305 if (IS_ERR(p)) { 306 dev_err(dev, "Failed to get pinctrl\n"); 307 return PTR_ERR(p); 308 } 309 cfg->pctl = p; 310 311 state = pinctrl_lookup_state(p, "ac97-reset"); 312 if (IS_ERR(state)) { 313 dev_err(dev, "Can't find pinctrl state ac97-reset\n"); 314 return PTR_ERR(state); 315 } 316 cfg->pstate_reset = state; 317 318 state = pinctrl_lookup_state(p, "ac97-warm-reset"); 319 if (IS_ERR(state)) { 320 dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); 321 return PTR_ERR(state); 322 } 323 cfg->pstate_warm_reset = state; 324 325 state = pinctrl_lookup_state(p, "ac97-running"); 326 if (IS_ERR(state)) { 327 dev_err(dev, "Can't find pinctrl state ac97-running\n"); 328 return PTR_ERR(state); 329 } 330 cfg->pstate_run = state; 331 332 cfg->sync_gpio = devm_gpiod_get_index(dev, "ac97", 0, GPIOD_ASIS); 333 if (IS_ERR(cfg->sync_gpio)) 334 return dev_err_probe(dev, PTR_ERR(cfg->sync_gpio), "Can't find ac97-sync gpio\n"); 335 gpiod_set_consumer_name(cfg->sync_gpio, "AC97 link sync"); 336 337 cfg->sdata_gpio = devm_gpiod_get_index(dev, "ac97", 1, GPIOD_ASIS); 338 if (IS_ERR(cfg->sdata_gpio)) 339 return dev_err_probe(dev, PTR_ERR(cfg->sdata_gpio), "Can't find ac97-sdata gpio\n"); 340 gpiod_set_consumer_name(cfg->sdata_gpio, "AC97 link sdata"); 341 342 cfg->reset_gpio = devm_gpiod_get_index(dev, "ac97", 2, GPIOD_ASIS); 343 if (IS_ERR(cfg->reset_gpio)) 344 return dev_err_probe(dev, PTR_ERR(cfg->reset_gpio), "Can't find ac97-reset gpio\n"); 345 gpiod_set_consumer_name(cfg->reset_gpio, "AC97 link reset"); 346 347 return 0; 348 } 349 350 struct snd_ac97_bus_ops *soc_ac97_ops; 351 EXPORT_SYMBOL_GPL(soc_ac97_ops); 352 353 int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) 354 { 355 if (ops == soc_ac97_ops) 356 return 0; 357 358 if (soc_ac97_ops && ops) 359 return -EBUSY; 360 361 soc_ac97_ops = ops; 362 soc_ac97_bus.ops = ops; 363 364 return 0; 365 } 366 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); 367 368 /** 369 * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions 370 * @ops: bus ops 371 * @pdev: platform device 372 * 373 * This function sets the reset and warm_reset properties of ops and parses 374 * the device node of pdev to get pinctrl states and gpio numbers to use. 375 */ 376 int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, 377 struct platform_device *pdev) 378 { 379 struct device *dev = &pdev->dev; 380 struct snd_ac97_reset_cfg cfg; 381 int ret; 382 383 ret = snd_soc_ac97_parse_pinctl(dev, &cfg); 384 if (ret) 385 return ret; 386 387 ret = snd_soc_set_ac97_ops(ops); 388 if (ret) 389 return ret; 390 391 ops->warm_reset = snd_soc_ac97_warm_reset; 392 ops->reset = snd_soc_ac97_reset; 393 394 snd_ac97_rst_cfg = cfg; 395 return 0; 396 } 397 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); 398