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"); 225