sound/soc/codecs/wm1250-ev1.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for the 1250-EV1 audio I/O module
   4  *
   5  * Copyright 2011 Wolfson Microelectronics plc
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/slab.h>
  11 #include <linux/i2c.h>
  12 #include <linux/gpio/consumer.h>
  13
  14 #include <sound/soc.h>
  15 #include <sound/soc-dapm.h>
  16
  17 struct wm1250_priv {
  18         struct gpio_desc *clk_ena;
  19         struct gpio_desc *clk_sel0;
  20         struct gpio_desc *clk_sel1;
  21         struct gpio_desc *osr;
  22         struct gpio_desc *master;
  23 };
  24
  25 static int wm1250_ev1_set_bias_level(struct snd_soc_component *component,
  26                                      enum snd_soc_bias_level level)
  27 {
  28         struct wm1250_priv *wm1250 = dev_get_drvdata(component->dev);
  29
  30         switch (level) {
  31         case SND_SOC_BIAS_ON:
  32                 break;
  33
  34         case SND_SOC_BIAS_PREPARE:
  35                 break;
  36
  37         case SND_SOC_BIAS_STANDBY:
  38                 gpiod_set_value_cansleep(wm1250->clk_ena, 1);
  39                 break;
  40
  41         case SND_SOC_BIAS_OFF:
  42                 gpiod_set_value_cansleep(wm1250->clk_ena, 0);
  43                 break;
  44         }
  45
  46         return 0;
  47 }
  48
  49 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
  50 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
  51 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
  52
  53 SND_SOC_DAPM_INPUT("WM1250 Input"),
  54 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
  55 };
  56
  57 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
  58         { "ADC", NULL, "WM1250 Input" },
  59         { "WM1250 Output", NULL, "DAC" },
  60 };
  61
  62 static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
  63                                 struct snd_pcm_hw_params *params,
  64                                 struct snd_soc_dai *dai)
  65 {
  66         struct wm1250_priv *wm1250 = snd_soc_component_get_drvdata(dai->component);
  67
  68         switch (params_rate(params)) {
  69         case 8000:
  70                 gpiod_set_value(wm1250->clk_sel0, 1);
  71                 gpiod_set_value(wm1250->clk_sel1, 1);
  72                 break;
  73         case 16000:
  74                 gpiod_set_value(wm1250->clk_sel0, 0);
  75                 gpiod_set_value(wm1250->clk_sel1, 1);
  76                 break;
  77         case 32000:
  78                 gpiod_set_value(wm1250->clk_sel0, 1);
  79                 gpiod_set_value(wm1250->clk_sel1, 0);
  80                 break;
  81         case 64000:
  82                 gpiod_set_value(wm1250->clk_sel0, 0);
  83                 gpiod_set_value(wm1250->clk_sel1, 0);
  84                 break;
  85         default:
  86                 return -EINVAL;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static const struct snd_soc_dai_ops wm1250_ev1_ops = {
  93         .hw_params = wm1250_ev1_hw_params,
  94 };
  95
  96 #define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
  97                           SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
  98
  99 static struct snd_soc_dai_driver wm1250_ev1_dai = {
 100         .name = "wm1250-ev1",
 101         .playback = {
 102                 .stream_name = "Playback",
 103                 .channels_min = 1,
 104                 .channels_max = 2,
 105                 .rates = WM1250_EV1_RATES,
 106                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 107         },
 108         .capture = {
 109                 .stream_name = "Capture",
 110                 .channels_min = 1,
 111                 .channels_max = 2,
 112                 .rates = WM1250_EV1_RATES,
 113                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 114         },
 115         .ops = &wm1250_ev1_ops,
 116 };
 117
 118 static const struct snd_soc_component_driver soc_component_dev_wm1250_ev1 = {
 119         .dapm_widgets           = wm1250_ev1_dapm_widgets,
 120         .num_dapm_widgets       = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
 121         .dapm_routes            = wm1250_ev1_dapm_routes,
 122         .num_dapm_routes        = ARRAY_SIZE(wm1250_ev1_dapm_routes),
 123         .set_bias_level         = wm1250_ev1_set_bias_level,
 124         .use_pmdown_time        = 1,
 125         .endianness             = 1,
 126 };
 127
 128 static int wm1250_ev1_pdata(struct i2c_client *i2c)
 129 {
 130         struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
 131         struct wm1250_priv *wm1250;
 132
 133         if (!pdata)
 134                 return 0;
 135
 136         wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
 137         if (!wm1250)
 138                 return -ENOMEM;
 139
 140         wm1250->clk_ena = devm_gpiod_get(&i2c->dev, "clk-ena", GPIOD_OUT_LOW);
 141         if (IS_ERR(wm1250->clk_ena))
 142                 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_ena),
 143                                      "failed to get clock enable GPIO\n");
 144
 145         wm1250->clk_sel0 = devm_gpiod_get(&i2c->dev, "clk-sel0", GPIOD_OUT_HIGH);
 146         if (IS_ERR(wm1250->clk_sel0))
 147                 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_sel0),
 148                                      "failed to get clock sel0 GPIO\n");
 149
 150         wm1250->clk_sel1 = devm_gpiod_get(&i2c->dev, "clk-sel1", GPIOD_OUT_HIGH);
 151         if (IS_ERR(wm1250->clk_sel1))
 152                 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_sel1),
 153                                      "failed to get clock sel1 GPIO\n");
 154
 155         wm1250->osr = devm_gpiod_get(&i2c->dev, "osr", GPIOD_OUT_LOW);
 156         if (IS_ERR(wm1250->osr))
 157                 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->osr),
 158                                      "failed to get OSR GPIO\n");
 159
 160         wm1250->master = devm_gpiod_get(&i2c->dev, "master", GPIOD_OUT_LOW);
 161         if (IS_ERR(wm1250->master))
 162                 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->master),
 163                                      "failed to get MASTER GPIO\n");
 164
 165         dev_set_drvdata(&i2c->dev, wm1250);
 166
 167         return 0;
 168 }
 169
 170 static int wm1250_ev1_probe(struct i2c_client *i2c)
 171 {
 172         int id, board, rev, ret;
 173
 174         dev_set_drvdata(&i2c->dev, NULL);
 175
 176         board = i2c_smbus_read_byte_data(i2c, 0);
 177         if (board < 0) {
 178                 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
 179                 return board;
 180         }
 181
 182         id = (board & 0xfe) >> 2;
 183         rev = board & 0x3;
 184
 185         if (id != 1) {
 186                 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
 187                 return -ENODEV;
 188         }
 189
 190         dev_info(&i2c->dev, "revision %d\n", rev + 1);
 191
 192         ret = wm1250_ev1_pdata(i2c);
 193         if (ret != 0)
 194                 return ret;
 195
 196         ret = devm_snd_soc_register_component(&i2c->dev, &soc_component_dev_wm1250_ev1,
 197                                      &wm1250_ev1_dai, 1);
 198         if (ret != 0) {
 199                 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
 200                 return ret;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
 207         { "wm1250-ev1" },
 208         { }
 209 };
 210 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
 211
 212 static struct i2c_driver wm1250_ev1_i2c_driver = {
 213         .driver = {
 214                 .name = "wm1250-ev1",
 215         },
 216         .probe =    wm1250_ev1_probe,
 217         .id_table = wm1250_ev1_i2c_id,
 218 };
 219
 220 module_i2c_driver(wm1250_ev1_i2c_driver);
 221
 222 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 223 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
 224 MODULE_LICENSE("GPL");