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 41 static struct snd_ac97_bus soc_ac97_bus = { 42 .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ 43 }; 44 45 static void soc_ac97_device_release(struct device *dev) 46 { 47 kfree(to_ac97_t(dev)); 48 } 49 50 /** 51 * snd_soc_alloc_ac97_codec() - Allocate new a AC'97 device 52 * @codec: The CODEC for which to create the AC'97 device 53 * 54 * Allocated a new snd_ac97 device and intializes it, but does not yet register 55 * it. The caller is responsible to either call device_add(&ac97->dev) to 56 * register the device, or to call put_device(&ac97->dev) to free the device. 57 * 58 * Returns: A snd_ac97 device or a PTR_ERR in case of an error. 59 */ 60 struct snd_ac97 *snd_soc_alloc_ac97_codec(struct snd_soc_codec *codec) 61 { 62 struct snd_ac97 *ac97; 63 64 ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); 65 if (ac97 == NULL) 66 return ERR_PTR(-ENOMEM); 67 68 ac97->bus = &soc_ac97_bus; 69 ac97->num = 0; 70 71 ac97->dev.bus = &ac97_bus_type; 72 ac97->dev.parent = codec->component.card->dev; 73 ac97->dev.release = soc_ac97_device_release; 74 75 dev_set_name(&ac97->dev, "%d-%d:%s", 76 codec->component.card->snd_card->number, 0, 77 codec->component.name); 78 79 device_initialize(&ac97->dev); 80 81 return ac97; 82 } 83 EXPORT_SYMBOL(snd_soc_alloc_ac97_codec); 84 85 /** 86 * snd_soc_new_ac97_codec - initailise AC97 device 87 * @codec: audio codec 88 * 89 * Initialises AC97 codec resources for use by ad-hoc devices only. 90 */ 91 struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec) 92 { 93 struct snd_ac97 *ac97; 94 int ret; 95 96 ac97 = snd_soc_alloc_ac97_codec(codec); 97 if (IS_ERR(ac97)) 98 return ac97; 99 100 ret = device_add(&ac97->dev); 101 if (ret) { 102 put_device(&ac97->dev); 103 return ERR_PTR(ret); 104 } 105 106 return ac97; 107 } 108 EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec); 109 110 /** 111 * snd_soc_free_ac97_codec - free AC97 codec device 112 * @codec: audio codec 113 * 114 * Frees AC97 codec device resources. 115 */ 116 void snd_soc_free_ac97_codec(struct snd_ac97 *ac97) 117 { 118 device_del(&ac97->dev); 119 ac97->bus = NULL; 120 put_device(&ac97->dev); 121 } 122 EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec); 123 124 static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; 125 126 static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) 127 { 128 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; 129 130 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); 131 132 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); 133 134 udelay(10); 135 136 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); 137 138 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); 139 msleep(2); 140 } 141 142 static void snd_soc_ac97_reset(struct snd_ac97 *ac97) 143 { 144 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; 145 146 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); 147 148 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); 149 gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); 150 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); 151 152 udelay(10); 153 154 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); 155 156 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); 157 msleep(2); 158 } 159 160 static int snd_soc_ac97_parse_pinctl(struct device *dev, 161 struct snd_ac97_reset_cfg *cfg) 162 { 163 struct pinctrl *p; 164 struct pinctrl_state *state; 165 int gpio; 166 int ret; 167 168 p = devm_pinctrl_get(dev); 169 if (IS_ERR(p)) { 170 dev_err(dev, "Failed to get pinctrl\n"); 171 return PTR_ERR(p); 172 } 173 cfg->pctl = p; 174 175 state = pinctrl_lookup_state(p, "ac97-reset"); 176 if (IS_ERR(state)) { 177 dev_err(dev, "Can't find pinctrl state ac97-reset\n"); 178 return PTR_ERR(state); 179 } 180 cfg->pstate_reset = state; 181 182 state = pinctrl_lookup_state(p, "ac97-warm-reset"); 183 if (IS_ERR(state)) { 184 dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); 185 return PTR_ERR(state); 186 } 187 cfg->pstate_warm_reset = state; 188 189 state = pinctrl_lookup_state(p, "ac97-running"); 190 if (IS_ERR(state)) { 191 dev_err(dev, "Can't find pinctrl state ac97-running\n"); 192 return PTR_ERR(state); 193 } 194 cfg->pstate_run = state; 195 196 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); 197 if (gpio < 0) { 198 dev_err(dev, "Can't find ac97-sync gpio\n"); 199 return gpio; 200 } 201 ret = devm_gpio_request(dev, gpio, "AC97 link sync"); 202 if (ret) { 203 dev_err(dev, "Failed requesting ac97-sync gpio\n"); 204 return ret; 205 } 206 cfg->gpio_sync = gpio; 207 208 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); 209 if (gpio < 0) { 210 dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); 211 return gpio; 212 } 213 ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); 214 if (ret) { 215 dev_err(dev, "Failed requesting ac97-sdata gpio\n"); 216 return ret; 217 } 218 cfg->gpio_sdata = gpio; 219 220 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); 221 if (gpio < 0) { 222 dev_err(dev, "Can't find ac97-reset gpio\n"); 223 return gpio; 224 } 225 ret = devm_gpio_request(dev, gpio, "AC97 link reset"); 226 if (ret) { 227 dev_err(dev, "Failed requesting ac97-reset gpio\n"); 228 return ret; 229 } 230 cfg->gpio_reset = gpio; 231 232 return 0; 233 } 234 235 struct snd_ac97_bus_ops *soc_ac97_ops; 236 EXPORT_SYMBOL_GPL(soc_ac97_ops); 237 238 int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) 239 { 240 if (ops == soc_ac97_ops) 241 return 0; 242 243 if (soc_ac97_ops && ops) 244 return -EBUSY; 245 246 soc_ac97_ops = ops; 247 soc_ac97_bus.ops = ops; 248 249 return 0; 250 } 251 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); 252 253 /** 254 * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions 255 * 256 * This function sets the reset and warm_reset properties of ops and parses 257 * the device node of pdev to get pinctrl states and gpio numbers to use. 258 */ 259 int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, 260 struct platform_device *pdev) 261 { 262 struct device *dev = &pdev->dev; 263 struct snd_ac97_reset_cfg cfg; 264 int ret; 265 266 ret = snd_soc_ac97_parse_pinctl(dev, &cfg); 267 if (ret) 268 return ret; 269 270 ret = snd_soc_set_ac97_ops(ops); 271 if (ret) 272 return ret; 273 274 ops->warm_reset = snd_soc_ac97_warm_reset; 275 ops->reset = snd_soc_ac97_reset; 276 277 snd_ac97_rst_cfg = cfg; 278 return 0; 279 } 280 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); 281