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>

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");