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"); 265