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         return 0;
  65 }
  66
  67 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
  68 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
  69 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
  70
  71 SND_SOC_DAPM_INPUT("WM1250 Input"),
  72 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
  73 };
  74
  75 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
  76         { "ADC", NULL, "WM1250 Input" },
  77         { "WM1250 Output", NULL, "DAC" },
  78 };
  79
  80 static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
  81                                 struct snd_pcm_hw_params *params,
  82                                 struct snd_soc_dai *dai)
  83 {
  84         struct wm1250_priv *wm1250 = snd_soc_codec_get_drvdata(dai->codec);
  85
  86         switch (params_rate(params)) {
  87         case 8000:
  88                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
  89                                1);
  90                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
  91                                1);
  92                 break;
  93         case 16000:
  94                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
  95                                0);
  96                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
  97                                1);
  98                 break;
  99         case 32000:
 100                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
 101                                1);
 102                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
 103                                0);
 104                 break;
 105         case 64000:
 106                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
 107                                0);
 108                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
 109                                0);
 110                 break;
 111         default:
 112                 return -EINVAL;
 113         }
 114
 115         return 0;
 116 }
 117
 118 static const struct snd_soc_dai_ops wm1250_ev1_ops = {
 119         .hw_params = wm1250_ev1_hw_params,
 120 };
 121
 122 #define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
 123                           SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
 124
 125 static struct snd_soc_dai_driver wm1250_ev1_dai = {
 126         .name = "wm1250-ev1",
 127         .playback = {
 128                 .stream_name = "Playback",
 129                 .channels_min = 1,
 130                 .channels_max = 2,
 131                 .rates = WM1250_EV1_RATES,
 132                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 133         },
 134         .capture = {
 135                 .stream_name = "Capture",
 136                 .channels_min = 1,
 137                 .channels_max = 2,
 138                 .rates = WM1250_EV1_RATES,
 139                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 140         },
 141         .ops = &wm1250_ev1_ops,
 142 };
 143
 144 static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
 145         .dapm_widgets = wm1250_ev1_dapm_widgets,
 146         .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
 147         .dapm_routes = wm1250_ev1_dapm_routes,
 148         .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
 149
 150         .set_bias_level = wm1250_ev1_set_bias_level,
 151         .idle_bias_off = true,
 152 };
 153
 154 static int wm1250_ev1_pdata(struct i2c_client *i2c)
 155 {
 156         struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
 157         struct wm1250_priv *wm1250;
 158         int i, ret;
 159
 160         if (!pdata)
 161                 return 0;
 162
 163         wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
 164         if (!wm1250) {
 165                 ret = -ENOMEM;
 166                 goto err;
 167         }
 168
 169         for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
 170                 wm1250->gpios[i].gpio = pdata->gpios[i];
 171                 wm1250->gpios[i].label = wm1250_gpio_names[i];
 172                 wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
 173         }
 174         wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
 175         wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
 176
 177         ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
 178         if (ret != 0) {
 179                 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
 180                 goto err;
 181         }
 182
 183         dev_set_drvdata(&i2c->dev, wm1250);
 184
 185         return ret;
 186
 187 err:
 188         return ret;
 189 }
 190
 191 static void wm1250_ev1_free(struct i2c_client *i2c)
 192 {
 193         struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
 194
 195         if (wm1250)
 196                 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
 197 }
 198
 199 static int wm1250_ev1_probe(struct i2c_client *i2c,
 200                             const struct i2c_device_id *i2c_id)
 201 {
 202         int id, board, rev, ret;
 203
 204         dev_set_drvdata(&i2c->dev, NULL);
 205
 206         board = i2c_smbus_read_byte_data(i2c, 0);
 207         if (board < 0) {
 208                 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
 209                 return board;
 210         }
 211
 212         id = (board & 0xfe) >> 2;
 213         rev = board & 0x3;
 214
 215         if (id != 1) {
 216                 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
 217                 return -ENODEV;
 218         }
 219
 220         dev_info(&i2c->dev, "revision %d\n", rev + 1);
 221
 222         ret = wm1250_ev1_pdata(i2c);
 223         if (ret != 0)
 224                 return ret;
 225
 226         ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
 227                                      &wm1250_ev1_dai, 1);
 228         if (ret != 0) {
 229                 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
 230                 wm1250_ev1_free(i2c);
 231                 return ret;
 232         }
 233
 234         return 0;
 235 }
 236
 237 static int wm1250_ev1_remove(struct i2c_client *i2c)
 238 {
 239         snd_soc_unregister_codec(&i2c->dev);
 240         wm1250_ev1_free(i2c);
 241
 242         return 0;
 243 }
 244
 245 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
 246         { "wm1250-ev1", 0 },
 247         { }
 248 };
 249 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
 250
 251 static struct i2c_driver wm1250_ev1_i2c_driver = {
 252         .driver = {
 253                 .name = "wm1250-ev1",
 254         },
 255         .probe =    wm1250_ev1_probe,
 256         .remove =   wm1250_ev1_remove,
 257         .id_table = wm1250_ev1_i2c_id,
 258 };
 259
 260 module_i2c_driver(wm1250_ev1_i2c_driver);
 261
 262 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 263 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
 264 MODULE_LICENSE("GPL");