1/* 2 * Driver for the 1250-EV1 audio I/O module 3 * 4 * Copyright 2011 Wolfson Microelectronics plc 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 * 11 */ 12 13#include <linux/init.h> 14#include <linux/module.h> 15#include <linux/slab.h> 16#include <linux/i2c.h> 17#include <linux/gpio.h> 18 19#include <sound/soc.h> 20#include <sound/soc-dapm.h> 21#include <sound/wm1250-ev1.h> 22 23static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = { 24 "WM1250 CLK_ENA", 25 "WM1250 CLK_SEL0", 26 "WM1250 CLK_SEL1", 27 "WM1250 OSR", 28 "WM1250 MASTER", 29}; 30 31struct wm1250_priv { 32 struct gpio gpios[WM1250_EV1_NUM_GPIOS]; 33}; 34 35static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec, 36 enum snd_soc_bias_level level) 37{ 38 struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev); 39 int ena; 40 41 if (wm1250) 42 ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio; 43 else 44 ena = -1; 45 46 switch (level) { 47 case SND_SOC_BIAS_ON: 48 break; 49 50 case SND_SOC_BIAS_PREPARE: 51 break; 52 53 case SND_SOC_BIAS_STANDBY: 54 if (ena >= 0) 55 gpio_set_value_cansleep(ena, 1); 56 break; 57 58 case SND_SOC_BIAS_OFF: 59 if (ena >= 0) 60 gpio_set_value_cansleep(ena, 0); 61 break; 62 } 63 64 codec->dapm.bias_level = level; 65 66 return 0; 67} 68 69static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = { 70SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0), 71SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0), 72 73SND_SOC_DAPM_INPUT("WM1250 Input"), 74SND_SOC_DAPM_OUTPUT("WM1250 Output"), 75}; 76 77static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = { 78 { "ADC", NULL, "WM1250 Input" }, 79 { "WM1250 Output", NULL, "DAC" }, 80}; 81 82static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream, 83 struct snd_pcm_hw_params *params, 84 struct snd_soc_dai *dai) 85{ 86 struct wm1250_priv *wm1250 = snd_soc_codec_get_drvdata(dai->codec); 87 88 switch (params_rate(params)) { 89 case 8000: 90 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio, 91 1); 92 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio, 93 1); 94 break; 95 case 16000: 96 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio, 97 0); 98 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio, 99 1); 100 break; 101 case 32000: 102 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio, 103 1); 104 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio, 105 0); 106 break; 107 case 64000: 108 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio, 109 0); 110 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio, 111 0); 112 break; 113 default: 114 return -EINVAL; 115 } 116 117 return 0; 118} 119 120static const struct snd_soc_dai_ops wm1250_ev1_ops = { 121 .hw_params = wm1250_ev1_hw_params, 122}; 123 124#define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\ 125 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000) 126 127static struct snd_soc_dai_driver wm1250_ev1_dai = { 128 .name = "wm1250-ev1", 129 .playback = { 130 .stream_name = "Playback", 131 .channels_min = 1, 132 .channels_max = 2, 133 .rates = WM1250_EV1_RATES, 134 .formats = SNDRV_PCM_FMTBIT_S16_LE, 135 }, 136 .capture = { 137 .stream_name = "Capture", 138 .channels_min = 1, 139 .channels_max = 2, 140 .rates = WM1250_EV1_RATES, 141 .formats = SNDRV_PCM_FMTBIT_S16_LE, 142 }, 143 .ops = &wm1250_ev1_ops, 144}; 145 146static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = { 147 .dapm_widgets = wm1250_ev1_dapm_widgets, 148 .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets), 149 .dapm_routes = wm1250_ev1_dapm_routes, 150 .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes), 151 152 .set_bias_level = wm1250_ev1_set_bias_level, 153 .idle_bias_off = true, 154}; 155 156static int wm1250_ev1_pdata(struct i2c_client *i2c) 157{ 158 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev); 159 struct wm1250_priv *wm1250; 160 int i, ret; 161 162 if (!pdata) 163 return 0; 164 165 wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL); 166 if (!wm1250) { 167 ret = -ENOMEM; 168 goto err; 169 } 170 171 for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) { 172 wm1250->gpios[i].gpio = pdata->gpios[i]; 173 wm1250->gpios[i].label = wm1250_gpio_names[i]; 174 wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW; 175 } 176 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH; 177 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH; 178 179 ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios)); 180 if (ret != 0) { 181 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret); 182 goto err; 183 } 184 185 dev_set_drvdata(&i2c->dev, wm1250); 186 187 return ret; 188 189err: 190 return ret; 191} 192 193static void wm1250_ev1_free(struct i2c_client *i2c) 194{ 195 struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev); 196 197 if (wm1250) 198 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios)); 199} 200 201static int wm1250_ev1_probe(struct i2c_client *i2c, 202 const struct i2c_device_id *i2c_id) 203{ 204 int id, board, rev, ret; 205 206 dev_set_drvdata(&i2c->dev, NULL); 207 208 board = i2c_smbus_read_byte_data(i2c, 0); 209 if (board < 0) { 210 dev_err(&i2c->dev, "Failed to read ID: %d\n", board); 211 return board; 212 } 213 214 id = (board & 0xfe) >> 2; 215 rev = board & 0x3; 216 217 if (id != 1) { 218 dev_err(&i2c->dev, "Unknown board ID %d\n", id); 219 return -ENODEV; 220 } 221 222 dev_info(&i2c->dev, "revision %d\n", rev + 1); 223 224 ret = wm1250_ev1_pdata(i2c); 225 if (ret != 0) 226 return ret; 227 228 ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1, 229 &wm1250_ev1_dai, 1); 230 if (ret != 0) { 231 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret); 232 wm1250_ev1_free(i2c); 233 return ret; 234 } 235 236 return 0; 237} 238 239static int wm1250_ev1_remove(struct i2c_client *i2c) 240{ 241 snd_soc_unregister_codec(&i2c->dev); 242 wm1250_ev1_free(i2c); 243 244 return 0; 245} 246 247static const struct i2c_device_id wm1250_ev1_i2c_id[] = { 248 { "wm1250-ev1", 0 }, 249 { } 250}; 251MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id); 252 253static struct i2c_driver wm1250_ev1_i2c_driver = { 254 .driver = { 255 .name = "wm1250-ev1", 256 .owner = THIS_MODULE, 257 }, 258 .probe = wm1250_ev1_probe, 259 .remove = wm1250_ev1_remove, 260 .id_table = wm1250_ev1_i2c_id, 261}; 262 263module_i2c_driver(wm1250_ev1_i2c_driver); 264 265MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 266MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver"); 267MODULE_LICENSE("GPL"); 268