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.h>
  13
  14 #include <sound/soc.h>
  15 #include <sound/soc-dapm.h>
  16 #include <sound/wm1250-ev1.h>
  17
  18 static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
  19         "WM1250 CLK_ENA",
  20         "WM1250 CLK_SEL0",
  21         "WM1250 CLK_SEL1",
  22         "WM1250 OSR",
  23         "WM1250 MASTER",
  24 };
  25
  26 struct wm1250_priv {
  27         struct gpio gpios[WM1250_EV1_NUM_GPIOS];
  28 };
  29
  30 static int wm1250_ev1_set_bias_level(struct snd_soc_component *component,
  31                                      enum snd_soc_bias_level level)
  32 {
  33         struct wm1250_priv *wm1250 = dev_get_drvdata(component->dev);
  34         int ena;
  35
  36         if (wm1250)
  37                 ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
  38         else
  39                 ena = -1;
  40
  41         switch (level) {
  42         case SND_SOC_BIAS_ON:
  43                 break;
  44
  45         case SND_SOC_BIAS_PREPARE:
  46                 break;
  47
  48         case SND_SOC_BIAS_STANDBY:
  49                 if (ena >= 0)
  50                         gpio_set_value_cansleep(ena, 1);
  51                 break;
  52
  53         case SND_SOC_BIAS_OFF:
  54                 if (ena >= 0)
  55                         gpio_set_value_cansleep(ena, 0);
  56                 break;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
  63 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
  64 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
  65
  66 SND_SOC_DAPM_INPUT("WM1250 Input"),
  67 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
  68 };
  69
  70 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
  71         { "ADC", NULL, "WM1250 Input" },
  72         { "WM1250 Output", NULL, "DAC" },
  73 };
  74
  75 static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
  76                                 struct snd_pcm_hw_params *params,
  77                                 struct snd_soc_dai *dai)
  78 {
  79         struct wm1250_priv *wm1250 = snd_soc_component_get_drvdata(dai->component);
  80
  81         switch (params_rate(params)) {
  82         case 8000:
  83                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
  84                                1);
  85                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
  86                                1);
  87                 break;
  88         case 16000:
  89                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
  90                                0);
  91                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
  92                                1);
  93                 break;
  94         case 32000:
  95                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
  96                                1);
  97                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
  98                                0);
  99                 break;
 100         case 64000:
 101                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
 102                                0);
 103                 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
 104                                0);
 105                 break;
 106         default:
 107                 return -EINVAL;
 108         }
 109
 110         return 0;
 111 }
 112
 113 static const struct snd_soc_dai_ops wm1250_ev1_ops = {
 114         .hw_params = wm1250_ev1_hw_params,
 115 };
 116
 117 #define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
 118                           SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
 119
 120 static struct snd_soc_dai_driver wm1250_ev1_dai = {
 121         .name = "wm1250-ev1",
 122         .playback = {
 123                 .stream_name = "Playback",
 124                 .channels_min = 1,
 125                 .channels_max = 2,
 126                 .rates = WM1250_EV1_RATES,
 127                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 128         },
 129         .capture = {
 130                 .stream_name = "Capture",
 131                 .channels_min = 1,
 132                 .channels_max = 2,
 133                 .rates = WM1250_EV1_RATES,
 134                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 135         },
 136         .ops = &wm1250_ev1_ops,
 137 };
 138
 139 static const struct snd_soc_component_driver soc_component_dev_wm1250_ev1 = {
 140         .dapm_widgets           = wm1250_ev1_dapm_widgets,
 141         .num_dapm_widgets       = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
 142         .dapm_routes            = wm1250_ev1_dapm_routes,
 143         .num_dapm_routes        = ARRAY_SIZE(wm1250_ev1_dapm_routes),
 144         .set_bias_level         = wm1250_ev1_set_bias_level,
 145         .use_pmdown_time        = 1,
 146         .endianness             = 1,
 147 };
 148
 149 static int wm1250_ev1_pdata(struct i2c_client *i2c)
 150 {
 151         struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
 152         struct wm1250_priv *wm1250;
 153         int i, ret;
 154
 155         if (!pdata)
 156                 return 0;
 157
 158         wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
 159         if (!wm1250) {
 160                 ret = -ENOMEM;
 161                 goto err;
 162         }
 163
 164         for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
 165                 wm1250->gpios[i].gpio = pdata->gpios[i];
 166                 wm1250->gpios[i].label = wm1250_gpio_names[i];
 167                 wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
 168         }
 169         wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
 170         wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
 171
 172         ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
 173         if (ret != 0) {
 174                 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
 175                 goto err;
 176         }
 177
 178         dev_set_drvdata(&i2c->dev, wm1250);
 179
 180         return ret;
 181
 182 err:
 183         return ret;
 184 }
 185
 186 static void wm1250_ev1_free(struct i2c_client *i2c)
 187 {
 188         struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
 189
 190         if (wm1250)
 191                 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
 192 }
 193
 194 static int wm1250_ev1_probe(struct i2c_client *i2c)
 195 {
 196         int id, board, rev, ret;
 197
 198         dev_set_drvdata(&i2c->dev, NULL);
 199
 200         board = i2c_smbus_read_byte_data(i2c, 0);
 201         if (board < 0) {
 202                 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
 203                 return board;
 204         }
 205
 206         id = (board & 0xfe) >> 2;
 207         rev = board & 0x3;
 208
 209         if (id != 1) {
 210                 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
 211                 return -ENODEV;
 212         }
 213
 214         dev_info(&i2c->dev, "revision %d\n", rev + 1);
 215
 216         ret = wm1250_ev1_pdata(i2c);
 217         if (ret != 0)
 218                 return ret;
 219
 220         ret = devm_snd_soc_register_component(&i2c->dev, &soc_component_dev_wm1250_ev1,
 221                                      &wm1250_ev1_dai, 1);
 222         if (ret != 0) {
 223                 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
 224                 wm1250_ev1_free(i2c);
 225                 return ret;
 226         }
 227
 228         return 0;
 229 }
 230
 231 static void wm1250_ev1_remove(struct i2c_client *i2c)
 232 {
 233         wm1250_ev1_free(i2c);
 234 }
 235
 236 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
 237         { "wm1250-ev1", 0 },
 238         { }
 239 };
 240 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
 241
 242 static struct i2c_driver wm1250_ev1_i2c_driver = {
 243         .driver = {
 244                 .name = "wm1250-ev1",
 245         },
 246         .probe_new = wm1250_ev1_probe,
 247         .remove =   wm1250_ev1_remove,
 248         .id_table = wm1250_ev1_i2c_id,
 249 };
 250
 251 module_i2c_driver(wm1250_ev1_i2c_driver);
 252
 253 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 254 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
 255 MODULE_LICENSE("GPL");