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 struct snd_soc_dai_driver wm1250_ev1_dai = { 83 .name = "wm1250-ev1", 84 .playback = { 85 .stream_name = "Playback", 86 .channels_min = 1, 87 .channels_max = 1, 88 .rates = SNDRV_PCM_RATE_8000, 89 .formats = SNDRV_PCM_FMTBIT_S16_LE, 90 }, 91 .capture = { 92 .stream_name = "Capture", 93 .channels_min = 1, 94 .channels_max = 1, 95 .rates = SNDRV_PCM_RATE_8000, 96 .formats = SNDRV_PCM_FMTBIT_S16_LE, 97 }, 98 }; 99 100 static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = { 101 .dapm_widgets = wm1250_ev1_dapm_widgets, 102 .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets), 103 .dapm_routes = wm1250_ev1_dapm_routes, 104 .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes), 105 106 .set_bias_level = wm1250_ev1_set_bias_level, 107 .idle_bias_off = true, 108 }; 109 110 static int __devinit wm1250_ev1_pdata(struct i2c_client *i2c) 111 { 112 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev); 113 struct wm1250_priv *wm1250; 114 int i, ret; 115 116 if (!pdata) 117 return 0; 118 119 wm1250 = kzalloc(sizeof(*wm1250), GFP_KERNEL); 120 if (!wm1250) { 121 dev_err(&i2c->dev, "Unable to allocate private data\n"); 122 ret = -ENOMEM; 123 goto err; 124 } 125 126 for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) { 127 wm1250->gpios[i].gpio = pdata->gpios[i]; 128 wm1250->gpios[i].label = wm1250_gpio_names[i]; 129 wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW; 130 } 131 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH; 132 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH; 133 134 ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios)); 135 if (ret != 0) { 136 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret); 137 goto err_alloc; 138 } 139 140 dev_set_drvdata(&i2c->dev, wm1250); 141 142 return ret; 143 144 err_alloc: 145 kfree(wm1250); 146 err: 147 return ret; 148 } 149 150 static void wm1250_ev1_free(struct i2c_client *i2c) 151 { 152 struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev); 153 154 if (wm1250) { 155 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios)); 156 kfree(wm1250); 157 } 158 } 159 160 static int __devinit wm1250_ev1_probe(struct i2c_client *i2c, 161 const struct i2c_device_id *i2c_id) 162 { 163 int id, board, rev, ret; 164 165 dev_set_drvdata(&i2c->dev, NULL); 166 167 board = i2c_smbus_read_byte_data(i2c, 0); 168 if (board < 0) { 169 dev_err(&i2c->dev, "Failed to read ID: %d\n", board); 170 return board; 171 } 172 173 id = (board & 0xfe) >> 2; 174 rev = board & 0x3; 175 176 if (id != 1) { 177 dev_err(&i2c->dev, "Unknown board ID %d\n", id); 178 return -ENODEV; 179 } 180 181 dev_info(&i2c->dev, "revision %d\n", rev + 1); 182 183 ret = wm1250_ev1_pdata(i2c); 184 if (ret != 0) 185 return ret; 186 187 ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1, 188 &wm1250_ev1_dai, 1); 189 if (ret != 0) { 190 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret); 191 wm1250_ev1_free(i2c); 192 return ret; 193 } 194 195 return 0; 196 } 197 198 static int __devexit wm1250_ev1_remove(struct i2c_client *i2c) 199 { 200 snd_soc_unregister_codec(&i2c->dev); 201 wm1250_ev1_free(i2c); 202 203 return 0; 204 } 205 206 static const struct i2c_device_id wm1250_ev1_i2c_id[] = { 207 { "wm1250-ev1", 0 }, 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 .owner = THIS_MODULE, 216 }, 217 .probe = wm1250_ev1_probe, 218 .remove = __devexit_p(wm1250_ev1_remove), 219 .id_table = wm1250_ev1_i2c_id, 220 }; 221 222 static int __init wm1250_ev1_modinit(void) 223 { 224 int ret = 0; 225 226 ret = i2c_add_driver(&wm1250_ev1_i2c_driver); 227 if (ret != 0) 228 pr_err("Failed to register WM1250-EV1 I2C driver: %d\n", ret); 229 230 return ret; 231 } 232 module_init(wm1250_ev1_modinit); 233 234 static void __exit wm1250_ev1_exit(void) 235 { 236 i2c_del_driver(&wm1250_ev1_i2c_driver); 237 } 238 module_exit(wm1250_ev1_exit); 239 240 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 241 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver"); 242 MODULE_LICENSE("GPL"); 243