2 * Driver for the 1250-EV1 audio I/O module
4 * Copyright 2011 Wolfson Microelectronics plc
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.
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>
19 #include <sound/soc.h>
20 #include <sound/soc-dapm.h>
21 #include <sound/wm1250-ev1.h>
23 static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
32 struct gpio gpios[WM1250_EV1_NUM_GPIOS];
35 static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
36 enum snd_soc_bias_level level)
38 struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
42 ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
50 case SND_SOC_BIAS_PREPARE:
53 case SND_SOC_BIAS_STANDBY:
55 gpio_set_value_cansleep(ena, 1);
58 case SND_SOC_BIAS_OFF:
60 gpio_set_value_cansleep(ena, 0);
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),
71 SND_SOC_DAPM_INPUT("WM1250 Input"),
72 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
75 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
76 { "ADC", NULL, "WM1250 Input" },
77 { "WM1250 Output", NULL, "DAC" },
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)
84 struct wm1250_priv *wm1250 = snd_soc_codec_get_drvdata(dai->codec);
86 switch (params_rate(params)) {
88 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
90 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
94 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
96 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
100 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
102 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
106 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
108 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
118 static const struct snd_soc_dai_ops wm1250_ev1_ops = {
119 .hw_params = wm1250_ev1_hw_params,
122 #define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
123 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
125 static struct snd_soc_dai_driver wm1250_ev1_dai = {
126 .name = "wm1250-ev1",
128 .stream_name = "Playback",
131 .rates = WM1250_EV1_RATES,
132 .formats = SNDRV_PCM_FMTBIT_S16_LE,
135 .stream_name = "Capture",
138 .rates = WM1250_EV1_RATES,
139 .formats = SNDRV_PCM_FMTBIT_S16_LE,
141 .ops = &wm1250_ev1_ops,
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),
150 .set_bias_level = wm1250_ev1_set_bias_level,
151 .idle_bias_off = true,
154 static int wm1250_ev1_pdata(struct i2c_client *i2c)
156 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
157 struct wm1250_priv *wm1250;
163 wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
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;
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;
177 ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
179 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
183 dev_set_drvdata(&i2c->dev, wm1250);
191 static void wm1250_ev1_free(struct i2c_client *i2c)
193 struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
196 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
199 static int wm1250_ev1_probe(struct i2c_client *i2c,
200 const struct i2c_device_id *i2c_id)
202 int id, board, rev, ret;
204 dev_set_drvdata(&i2c->dev, NULL);
206 board = i2c_smbus_read_byte_data(i2c, 0);
208 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
212 id = (board & 0xfe) >> 2;
216 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
220 dev_info(&i2c->dev, "revision %d\n", rev + 1);
222 ret = wm1250_ev1_pdata(i2c);
226 ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
229 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
230 wm1250_ev1_free(i2c);
237 static int wm1250_ev1_remove(struct i2c_client *i2c)
239 snd_soc_unregister_codec(&i2c->dev);
240 wm1250_ev1_free(i2c);
245 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
249 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
251 static struct i2c_driver wm1250_ev1_i2c_driver = {
253 .name = "wm1250-ev1",
254 .owner = THIS_MODULE,
256 .probe = wm1250_ev1_probe,
257 .remove = wm1250_ev1_remove,
258 .id_table = wm1250_ev1_i2c_id,
261 module_i2c_driver(wm1250_ev1_i2c_driver);
263 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
264 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
265 MODULE_LICENSE("GPL");