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authorHugo Villeneuve <hugo@hugovil.com>2008-11-19 01:37:31 -0500
committerMark Brown <broonie@opensource.wolfsonmicro.com>2008-11-19 13:16:38 +0000
commit1c0090c280da18f79e3e94168b5f3bfe4eb5f1c8 (patch)
tree0e81a01eccca0060c964fa0646ac6792f98f3213 /sound/soc/codecs/pcm3008.c
parentca3ea02e90d63a6a91c1c2a445d6d71f9031a44a (diff)
ASoC: Add PCM3008 ALSA SoC driver
The PCM3008 is a 16-bit stereo audio codec. It accepts left-justified format for ADC, and right-justified format for DAC. Independent power-down modes for ADC and DAC are provided, as well as a digital de-emphasis filter (4 modes). [Merged Makefile & Kconfig, changed asm/gpio.h to linux/gpio.h -- broonie] Signed-off-by: Hugo Villeneuve <hugo@hugovil.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/codecs/pcm3008.c')
-rw-r--r--sound/soc/codecs/pcm3008.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/sound/soc/codecs/pcm3008.c b/sound/soc/codecs/pcm3008.c
new file mode 100644
index 000000000000..2b26e1d80c8d
--- /dev/null
+++ b/sound/soc/codecs/pcm3008.c
@@ -0,0 +1,201 @@
+/*
+ * ALSA Soc PCM3008 codec support
+ *
+ * Author: Hugo Villeneuve
+ * Copyright (C) 2008 Lyrtech inc
+ *
+ * Based on AC97 Soc codec, original copyright follow:
+ * Copyright 2005 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.
+ *
+ * Generic PCM3008 support.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "pcm3008.h"
+
+#define PCM3008_VERSION "0.2"
+
+#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000)
+
+struct snd_soc_dai pcm3008_dai = {
+ .name = "PCM3008 HiFi",
+ .type = SND_SOC_DAI_I2S,
+ .playback = {
+ .stream_name = "PCM3008 Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = PCM3008_RATES,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .capture = {
+ .stream_name = "PCM3008 Capture",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = PCM3008_RATES,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+};
+EXPORT_SYMBOL_GPL(pcm3008_dai);
+
+static void pcm3008_gpio_free(struct pcm3008_setup_data *setup)
+{
+ gpio_free(setup->dem0_pin);
+ gpio_free(setup->dem1_pin);
+ gpio_free(setup->pdad_pin);
+ gpio_free(setup->pdda_pin);
+}
+
+static int pcm3008_soc_probe(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec;
+ struct pcm3008_setup_data *setup = socdev->codec_data;
+ int ret = 0;
+
+ printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);
+
+ socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+ if (!socdev->codec)
+ return -ENOMEM;
+
+ codec = socdev->codec;
+ mutex_init(&codec->mutex);
+
+ codec->name = "PCM3008";
+ codec->owner = THIS_MODULE;
+ codec->dai = &pcm3008_dai;
+ codec->num_dai = 1;
+ codec->write = NULL;
+ codec->read = NULL;
+ INIT_LIST_HEAD(&codec->dapm_widgets);
+ INIT_LIST_HEAD(&codec->dapm_paths);
+
+ /* Register PCMs. */
+ ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+ if (ret < 0) {
+ printk(KERN_ERR "pcm3008: failed to create pcms\n");
+ goto pcm_err;
+ }
+
+ /* Register Card. */
+ ret = snd_soc_register_card(socdev);
+ if (ret < 0) {
+ printk(KERN_ERR "pcm3008: failed to register card\n");
+ goto card_err;
+ }
+
+ /* DEM1 DEM0 DE-EMPHASIS_MODE
+ * Low Low De-emphasis 44.1 kHz ON
+ * Low High De-emphasis OFF
+ * High Low De-emphasis 48 kHz ON
+ * High High De-emphasis 32 kHz ON
+ */
+
+ /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
+ ret = gpio_request(setup->dem0_pin, "codec_dem0");
+ if (ret == 0)
+ ret = gpio_direction_output(setup->dem0_pin, 1);
+ if (ret != 0)
+ goto gpio_err;
+
+ /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
+ ret = gpio_request(setup->dem1_pin, "codec_dem1");
+ if (ret == 0)
+ ret = gpio_direction_output(setup->dem1_pin, 0);
+ if (ret != 0)
+ goto gpio_err;
+
+ /* Configure PDAD GPIO. */
+ ret = gpio_request(setup->pdad_pin, "codec_pdad");
+ if (ret == 0)
+ ret = gpio_direction_output(setup->pdad_pin, 1);
+ if (ret != 0)
+ goto gpio_err;
+
+ /* Configure PDDA GPIO. */
+ ret = gpio_request(setup->pdda_pin, "codec_pdda");
+ if (ret == 0)
+ ret = gpio_direction_output(setup->pdda_pin, 1);
+ if (ret != 0)
+ goto gpio_err;
+
+ return ret;
+
+gpio_err:
+ pcm3008_gpio_free(setup);
+card_err:
+ snd_soc_free_pcms(socdev);
+pcm_err:
+ kfree(socdev->codec);
+
+ return ret;
+}
+
+static int pcm3008_soc_remove(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = socdev->codec;
+ struct pcm3008_setup_data *setup = socdev->codec_data;
+
+ if (!codec)
+ return 0;
+
+ pcm3008_gpio_free(setup);
+ snd_soc_free_pcms(socdev);
+ kfree(socdev->codec);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int pcm3008_soc_suspend(struct platform_device *pdev, pm_message_t msg)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct pcm3008_setup_data *setup = socdev->codec_data;
+
+ gpio_set_value(setup->pdad_pin, 0);
+ gpio_set_value(setup->pdda_pin, 0);
+
+ return 0;
+}
+
+static int pcm3008_soc_resume(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct pcm3008_setup_data *setup = socdev->codec_data;
+
+ gpio_set_value(setup->pdad_pin, 1);
+ gpio_set_value(setup->pdda_pin, 1);
+
+ return 0;
+}
+#else
+#define pcm3008_soc_suspend NULL
+#define pcm3008_soc_resume NULL
+#endif
+
+struct snd_soc_codec_device soc_codec_dev_pcm3008 = {
+ .probe = pcm3008_soc_probe,
+ .remove = pcm3008_soc_remove,
+ .suspend = pcm3008_soc_suspend,
+ .resume = pcm3008_soc_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_pcm3008);
+
+MODULE_DESCRIPTION("Soc PCM3008 driver");
+MODULE_AUTHOR("Hugo Villeneuve");
+MODULE_LICENSE("GPL");