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"); 256