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_new_ac97_codec - initailise AC97 device 52 * @codec: audio codec 53 * 54 * Initialises AC97 codec resources for use by ad-hoc devices only. 55 */ 56 struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec) 57 { 58 struct snd_ac97 *ac97; 59 int ret; 60 61 ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); 62 if (ac97 == NULL) 63 return ERR_PTR(-ENOMEM); 64 65 ac97->bus = &soc_ac97_bus; 66 ac97->num = 0; 67 68 ac97->dev.bus = &ac97_bus_type; 69 ac97->dev.parent = codec->component.card->dev; 70 ac97->dev.release = soc_ac97_device_release; 71 72 dev_set_name(&ac97->dev, "%d-%d:%s", 73 codec->component.card->snd_card->number, 0, 74 codec->component.name); 75 76 ret = device_register(&ac97->dev); 77 if (ret) { 78 put_device(&ac97->dev); 79 return ERR_PTR(ret); 80 } 81 82 return ac97; 83 } 84 EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec); 85 86 /** 87 * snd_soc_free_ac97_codec - free AC97 codec device 88 * @codec: audio codec 89 * 90 * Frees AC97 codec device resources. 91 */ 92 void snd_soc_free_ac97_codec(struct snd_ac97 *ac97) 93 { 94 device_del(&ac97->dev); 95 ac97->bus = NULL; 96 put_device(&ac97->dev); 97 } 98 EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec); 99 100 static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; 101 102 static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) 103 { 104 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; 105 106 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); 107 108 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); 109 110 udelay(10); 111 112 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); 113 114 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); 115 msleep(2); 116 } 117 118 static void snd_soc_ac97_reset(struct snd_ac97 *ac97) 119 { 120 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; 121 122 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); 123 124 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); 125 gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); 126 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); 127 128 udelay(10); 129 130 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); 131 132 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); 133 msleep(2); 134 } 135 136 static int snd_soc_ac97_parse_pinctl(struct device *dev, 137 struct snd_ac97_reset_cfg *cfg) 138 { 139 struct pinctrl *p; 140 struct pinctrl_state *state; 141 int gpio; 142 int ret; 143 144 p = devm_pinctrl_get(dev); 145 if (IS_ERR(p)) { 146 dev_err(dev, "Failed to get pinctrl\n"); 147 return PTR_ERR(p); 148 } 149 cfg->pctl = p; 150 151 state = pinctrl_lookup_state(p, "ac97-reset"); 152 if (IS_ERR(state)) { 153 dev_err(dev, "Can't find pinctrl state ac97-reset\n"); 154 return PTR_ERR(state); 155 } 156 cfg->pstate_reset = state; 157 158 state = pinctrl_lookup_state(p, "ac97-warm-reset"); 159 if (IS_ERR(state)) { 160 dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); 161 return PTR_ERR(state); 162 } 163 cfg->pstate_warm_reset = state; 164 165 state = pinctrl_lookup_state(p, "ac97-running"); 166 if (IS_ERR(state)) { 167 dev_err(dev, "Can't find pinctrl state ac97-running\n"); 168 return PTR_ERR(state); 169 } 170 cfg->pstate_run = state; 171 172 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); 173 if (gpio < 0) { 174 dev_err(dev, "Can't find ac97-sync gpio\n"); 175 return gpio; 176 } 177 ret = devm_gpio_request(dev, gpio, "AC97 link sync"); 178 if (ret) { 179 dev_err(dev, "Failed requesting ac97-sync gpio\n"); 180 return ret; 181 } 182 cfg->gpio_sync = gpio; 183 184 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); 185 if (gpio < 0) { 186 dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); 187 return gpio; 188 } 189 ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); 190 if (ret) { 191 dev_err(dev, "Failed requesting ac97-sdata gpio\n"); 192 return ret; 193 } 194 cfg->gpio_sdata = gpio; 195 196 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); 197 if (gpio < 0) { 198 dev_err(dev, "Can't find ac97-reset gpio\n"); 199 return gpio; 200 } 201 ret = devm_gpio_request(dev, gpio, "AC97 link reset"); 202 if (ret) { 203 dev_err(dev, "Failed requesting ac97-reset gpio\n"); 204 return ret; 205 } 206 cfg->gpio_reset = gpio; 207 208 return 0; 209 } 210 211 struct snd_ac97_bus_ops *soc_ac97_ops; 212 EXPORT_SYMBOL_GPL(soc_ac97_ops); 213 214 int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) 215 { 216 if (ops == soc_ac97_ops) 217 return 0; 218 219 if (soc_ac97_ops && ops) 220 return -EBUSY; 221 222 soc_ac97_ops = ops; 223 soc_ac97_bus.ops = ops; 224 225 return 0; 226 } 227 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); 228 229 /** 230 * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions 231 * 232 * This function sets the reset and warm_reset properties of ops and parses 233 * the device node of pdev to get pinctrl states and gpio numbers to use. 234 */ 235 int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, 236 struct platform_device *pdev) 237 { 238 struct device *dev = &pdev->dev; 239 struct snd_ac97_reset_cfg cfg; 240 int ret; 241 242 ret = snd_soc_ac97_parse_pinctl(dev, &cfg); 243 if (ret) 244 return ret; 245 246 ret = snd_soc_set_ac97_ops(ops); 247 if (ret) 248 return ret; 249 250 ops->warm_reset = snd_soc_ac97_warm_reset; 251 ops->reset = snd_soc_ac97_reset; 252 253 snd_ac97_rst_cfg = cfg; 254 return 0; 255 } 256 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); 257