diff options
Diffstat (limited to 'sound/soc/codecs/wm1250-ev1.c')
| -rw-r--r-- | sound/soc/codecs/wm1250-ev1.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm1250-ev1.c b/sound/soc/codecs/wm1250-ev1.c new file mode 100644 index 00000000..aefb4f89 --- /dev/null +++ b/sound/soc/codecs/wm1250-ev1.c @@ -0,0 +1,238 @@ +/* + * Driver for the 1250-EV1 audio I/O module + * + * Copyright 2011 Wolfson Microelectronics plc + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/gpio.h> + +#include <sound/soc.h> +#include <sound/soc-dapm.h> +#include <sound/wm1250-ev1.h> + +static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = { + "WM1250 CLK_ENA", + "WM1250 CLK_SEL0", + "WM1250 CLK_SEL1", + "WM1250 OSR", + "WM1250 MASTER", +}; + +struct wm1250_priv { + struct gpio gpios[WM1250_EV1_NUM_GPIOS]; +}; + +static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec, + enum snd_soc_bias_level level) +{ + struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev); + int ena; + + if (wm1250) + ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio; + else + ena = -1; + + switch (level) { + case SND_SOC_BIAS_ON: + break; + + case SND_SOC_BIAS_PREPARE: + break; + + case SND_SOC_BIAS_STANDBY: + if (ena >= 0) + gpio_set_value_cansleep(ena, 1); + break; + + case SND_SOC_BIAS_OFF: + if (ena >= 0) + gpio_set_value_cansleep(ena, 0); + break; + } + + codec->dapm.bias_level = level; + + return 0; +} + +static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = { +SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0), +SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0), + +SND_SOC_DAPM_INPUT("WM1250 Input"), +SND_SOC_DAPM_OUTPUT("WM1250 Output"), +}; + +static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = { + { "ADC", NULL, "WM1250 Input" }, + { "WM1250 Output", NULL, "DAC" }, +}; + +static struct snd_soc_dai_driver wm1250_ev1_dai = { + .name = "wm1250-ev1", + .playback = { + .stream_name = "Playback", + .channels_min = 1, + .channels_max = 1, + .rates = SNDRV_PCM_RATE_8000, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + }, + .capture = { + .stream_name = "Capture", + .channels_min = 1, + .channels_max = 1, + .rates = SNDRV_PCM_RATE_8000, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + }, +}; + +static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = { + .dapm_widgets = wm1250_ev1_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets), + .dapm_routes = wm1250_ev1_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes), + + .set_bias_level = wm1250_ev1_set_bias_level, + .idle_bias_off = true, +}; + +static int __devinit wm1250_ev1_pdata(struct i2c_client *i2c) +{ + struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev); + struct wm1250_priv *wm1250; + int i, ret; + + if (!pdata) + return 0; + + wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL); + if (!wm1250) { + dev_err(&i2c->dev, "Unable to allocate private data\n"); + ret = -ENOMEM; + goto err; + } + + for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) { + wm1250->gpios[i].gpio = pdata->gpios[i]; + wm1250->gpios[i].label = wm1250_gpio_names[i]; + wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW; + } + wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH; + wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH; + + ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios)); + if (ret != 0) { + dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret); + goto err; + } + + dev_set_drvdata(&i2c->dev, wm1250); + + return ret; + +err: + return ret; +} + +static void wm1250_ev1_free(struct i2c_client *i2c) +{ + struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev); + + if (wm1250) + gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios)); +} + +static int __devinit wm1250_ev1_probe(struct i2c_client *i2c, + const struct i2c_device_id *i2c_id) +{ + int id, board, rev, ret; + + dev_set_drvdata(&i2c->dev, NULL); + + board = i2c_smbus_read_byte_data(i2c, 0); + if (board < 0) { + dev_err(&i2c->dev, "Failed to read ID: %d\n", board); + return board; + } + + id = (board & 0xfe) >> 2; + rev = board & 0x3; + + if (id != 1) { + dev_err(&i2c->dev, "Unknown board ID %d\n", id); + return -ENODEV; + } + + dev_info(&i2c->dev, "revision %d\n", rev + 1); + + ret = wm1250_ev1_pdata(i2c); + if (ret != 0) + return ret; + + ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1, + &wm1250_ev1_dai, 1); + if (ret != 0) { + dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret); + wm1250_ev1_free(i2c); + return ret; + } + + return 0; +} + +static int __devexit wm1250_ev1_remove(struct i2c_client *i2c) +{ + snd_soc_unregister_codec(&i2c->dev); + wm1250_ev1_free(i2c); + + return 0; +} + +static const struct i2c_device_id wm1250_ev1_i2c_id[] = { + { "wm1250-ev1", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id); + +static struct i2c_driver wm1250_ev1_i2c_driver = { + .driver = { + .name = "wm1250-ev1", + .owner = THIS_MODULE, + }, + .probe = wm1250_ev1_probe, + .remove = __devexit_p(wm1250_ev1_remove), + .id_table = wm1250_ev1_i2c_id, +}; + +static int __init wm1250_ev1_modinit(void) +{ + int ret = 0; + + ret = i2c_add_driver(&wm1250_ev1_i2c_driver); + if (ret != 0) + pr_err("Failed to register WM1250-EV1 I2C driver: %d\n", ret); + + return ret; +} +module_init(wm1250_ev1_modinit); + +static void __exit wm1250_ev1_exit(void) +{ + i2c_del_driver(&wm1250_ev1_i2c_driver); +} +module_exit(wm1250_ev1_exit); + +MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); +MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver"); +MODULE_LICENSE("GPL"); |