kernel/sound/soc/codecs/wm1250-ev1.c

   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
  23 static 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
  31 struct wm1250_priv {
  32         struct gpio gpios[WM1250_EV1_NUM_GPIOS];
  33 };
  34
  35 static 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
  69 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
  70 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
  71 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
  72
  73 SND_SOC_DAPM_INPUT("WM1250 Input"),
  74 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
  75 };
  76
  77 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
  78         { "ADC", NULL, "WM1250 Input" },
  79         { "WM1250 Output", NULL, "DAC" },
  80 };
  81
  82 static 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
 120 static 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
 127 static 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
 146 static 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
 156 static 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
 189 err:
 190         return ret;
 191 }
 192
 193 static 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
 201 static 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
 239 static 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
 247 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
 248         { "wm1250-ev1", 0 },
 249         { }
 250 };
 251 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
 252
 253 static 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
 263 module_i2c_driver(wm1250_ev1_i2c_driver);
 264
 265 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 266 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
 267 MODULE_LICENSE("GPL");