266 lines
6.1 KiB
C
266 lines
6.1 KiB
C
/*
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* Driver for the 1250-EV1 audio I/O module
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*
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* Copyright 2011 Wolfson Microelectronics plc
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <sound/soc.h>
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#include <sound/soc-dapm.h>
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#include <sound/wm1250-ev1.h>
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static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
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"WM1250 CLK_ENA",
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"WM1250 CLK_SEL0",
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"WM1250 CLK_SEL1",
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"WM1250 OSR",
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"WM1250 MASTER",
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};
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struct wm1250_priv {
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struct gpio gpios[WM1250_EV1_NUM_GPIOS];
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};
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static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
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enum snd_soc_bias_level level)
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{
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struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
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int ena;
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if (wm1250)
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ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
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else
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ena = -1;
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switch (level) {
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case SND_SOC_BIAS_ON:
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break;
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case SND_SOC_BIAS_PREPARE:
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break;
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case SND_SOC_BIAS_STANDBY:
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if (ena >= 0)
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gpio_set_value_cansleep(ena, 1);
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break;
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case SND_SOC_BIAS_OFF:
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if (ena >= 0)
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gpio_set_value_cansleep(ena, 0);
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break;
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}
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return 0;
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}
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static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
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SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_INPUT("WM1250 Input"),
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SND_SOC_DAPM_OUTPUT("WM1250 Output"),
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};
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static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
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{ "ADC", NULL, "WM1250 Input" },
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{ "WM1250 Output", NULL, "DAC" },
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};
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static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct wm1250_priv *wm1250 = snd_soc_codec_get_drvdata(dai->codec);
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switch (params_rate(params)) {
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case 8000:
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gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
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1);
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gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
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1);
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break;
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case 16000:
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gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
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0);
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gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
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1);
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break;
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case 32000:
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gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
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1);
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gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
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0);
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break;
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case 64000:
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gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
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0);
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gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
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0);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static const struct snd_soc_dai_ops wm1250_ev1_ops = {
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.hw_params = wm1250_ev1_hw_params,
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};
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#define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
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SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
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static struct snd_soc_dai_driver wm1250_ev1_dai = {
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.name = "wm1250-ev1",
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.playback = {
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.stream_name = "Playback",
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.channels_min = 1,
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.channels_max = 2,
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.rates = WM1250_EV1_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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},
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.capture = {
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.stream_name = "Capture",
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.channels_min = 1,
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.channels_max = 2,
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.rates = WM1250_EV1_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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},
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.ops = &wm1250_ev1_ops,
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};
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static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
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.dapm_widgets = wm1250_ev1_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
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.dapm_routes = wm1250_ev1_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
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.set_bias_level = wm1250_ev1_set_bias_level,
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.idle_bias_off = true,
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};
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static int wm1250_ev1_pdata(struct i2c_client *i2c)
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{
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struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
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struct wm1250_priv *wm1250;
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int i, ret;
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if (!pdata)
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return 0;
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wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
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if (!wm1250) {
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ret = -ENOMEM;
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goto err;
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}
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for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
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wm1250->gpios[i].gpio = pdata->gpios[i];
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wm1250->gpios[i].label = wm1250_gpio_names[i];
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wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
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}
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wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
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wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
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ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
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if (ret != 0) {
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dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
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goto err;
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}
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dev_set_drvdata(&i2c->dev, wm1250);
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return ret;
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err:
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return ret;
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}
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static void wm1250_ev1_free(struct i2c_client *i2c)
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{
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struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
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if (wm1250)
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gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
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}
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static int wm1250_ev1_probe(struct i2c_client *i2c,
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const struct i2c_device_id *i2c_id)
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{
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int id, board, rev, ret;
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dev_set_drvdata(&i2c->dev, NULL);
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board = i2c_smbus_read_byte_data(i2c, 0);
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if (board < 0) {
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dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
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return board;
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}
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id = (board & 0xfe) >> 2;
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rev = board & 0x3;
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if (id != 1) {
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dev_err(&i2c->dev, "Unknown board ID %d\n", id);
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return -ENODEV;
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}
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dev_info(&i2c->dev, "revision %d\n", rev + 1);
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ret = wm1250_ev1_pdata(i2c);
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if (ret != 0)
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return ret;
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ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
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&wm1250_ev1_dai, 1);
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if (ret != 0) {
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dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
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wm1250_ev1_free(i2c);
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return ret;
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}
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return 0;
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}
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static int wm1250_ev1_remove(struct i2c_client *i2c)
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{
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snd_soc_unregister_codec(&i2c->dev);
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wm1250_ev1_free(i2c);
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return 0;
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}
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static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
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{ "wm1250-ev1", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
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static struct i2c_driver wm1250_ev1_i2c_driver = {
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.driver = {
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.name = "wm1250-ev1",
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.owner = THIS_MODULE,
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},
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.probe = wm1250_ev1_probe,
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.remove = wm1250_ev1_remove,
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.id_table = wm1250_ev1_i2c_id,
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};
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module_i2c_driver(wm1250_ev1_i2c_driver);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
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MODULE_LICENSE("GPL");
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