ASoC: Add audio support for the Atmel AT91SAM9G20ek board(uing wolfson 8731).

Add audio support for the Atmel AT91SAM9G20ek board(uing wolfson 8731).
It is based on the former eti_b1_wm8731.c file, using the atmel scc API.

Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/atmel/sam9g20_wm8731.c b/sound/soc/atmel/sam9g20_wm8731.c
new file mode 100644 (file)
index 0000000..4e191df
--- /dev/null
+++ b/sound/soc/atmel/sam9g20_wm8731.c
@@ -0,0 +1,329 @@
+/*
+ * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
+ *                     ATMEL AT91SAM9G20ek board.
+ *
+ *  Copyright (C) 2005 SAN People
+ *  Copyright (C) 2008 Atmel
+ *
+ * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
+ *
+ * Based on ati_b1_wm8731.c by:
+ * Frank Mandarino <fmandarino@endrelia.com>
+ * Copyright 2006 Endrelia Technologies Inc.
+ * Based on corgi.c by:
+ * Copyright 2005 Wolfson Microelectronics PLC.
+ * Copyright 2005 Openedhand Ltd.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <linux/atmel-ssc.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include <mach/hardware.h>
+#include <mach/gpio.h>
+
+#include "../codecs/wm8731.h"
+#include "atmel-pcm.h"
+#include "atmel_ssc_dai.h"
+
+
+static int at91sam9g20ek_startup(struct snd_pcm_substream *substream)
+{
+       struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+       struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
+       int ret;
+
+       /* codec system clock is supplied by PCK0, set to 12MHz */
+       ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
+               12000000, SND_SOC_CLOCK_IN);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+static void at91sam9g20ek_shutdown(struct snd_pcm_substream *substream)
+{
+       struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
+
+       dev_dbg(rtd->socdev->dev, "shutdown");
+}
+
+static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
+       struct snd_pcm_hw_params *params)
+{
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
+       struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+       struct atmel_ssc_info *ssc_p = cpu_dai->private_data;
+       struct ssc_device *ssc = ssc_p->ssc;
+       int ret;
+
+       unsigned int rate;
+       int cmr_div, period;
+
+       if (ssc == NULL) {
+               printk(KERN_INFO "at91sam9g20ek_hw_params: ssc is NULL!\n");
+               return -EINVAL;
+       }
+
+       /* set codec DAI configuration */
+       ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
+               SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
+       if (ret < 0)
+               return ret;
+
+       /* set cpu DAI configuration */
+       ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
+               SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
+       if (ret < 0)
+               return ret;
+
+       /*
+        * The SSC clock dividers depend on the sample rate.  The CMR.DIV
+        * field divides the system master clock MCK to drive the SSC TK
+        * signal which provides the codec BCLK.  The TCMR.PERIOD and
+        * RCMR.PERIOD fields further divide the BCLK signal to drive
+        * the SSC TF and RF signals which provide the codec DACLRC and
+        * ADCLRC clocks.
+        *
+        * The dividers were determined through trial and error, where a
+        * CMR.DIV value is chosen such that the resulting BCLK value is
+        * divisible, or almost divisible, by (2 * sample rate), and then
+        * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
+        */
+       rate = params_rate(params);
+
+       switch (rate) {
+       case 8000:
+               cmr_div = 55;   /* BCLK = 133MHz/(2*55) = 1.209MHz */
+               period = 74;    /* LRC = BCLK/(2*(74+1)) ~= 8060,6Hz */
+               break;
+       case 11025:
+               cmr_div = 67;   /* BCLK = 133MHz/(2*60) = 1.108MHz */
+               period = 45;    /* LRC = BCLK/(2*(49+1)) = 11083,3Hz */
+               break;
+       case 16000:
+               cmr_div = 63;   /* BCLK = 133MHz/(2*63) = 1.055MHz */
+               period = 32;    /* LRC = BCLK/(2*(32+1)) = 15993,2Hz */
+               break;
+       case 22050:
+               cmr_div = 52;   /* BCLK = 133MHz/(2*52) = 1.278MHz */
+               period = 28;    /* LRC = BCLK/(2*(28+1)) = 22049Hz */
+               break;
+       case 32000:
+               cmr_div = 66;   /* BCLK = 133MHz/(2*66) = 1.007MHz */
+               period = 15;    /* LRC = BCLK/(2*(15+1)) = 31486,742Hz */
+               break;
+       case 44100:
+               cmr_div = 29;   /* BCLK = 133MHz/(2*29) = 2.293MHz */
+               period = 25;    /* LRC = BCLK/(2*(25+1)) = 44098Hz */
+               break;
+       case 48000:
+               cmr_div = 33;   /* BCLK = 133MHz/(2*33) = 2.015MHz */
+               period = 20;    /* LRC = BCLK/(2*(20+1)) = 47979,79Hz */
+               break;
+       case 88200:
+               cmr_div = 29;   /* BCLK = 133MHz/(2*29) = 2.293MHz */
+               period = 12;    /* LRC = BCLK/(2*(12+1)) = 88196Hz */
+               break;
+       case 96000:
+               cmr_div = 23;   /* BCLK = 133MHz/(2*23) = 2.891MHz */
+               period = 14;    /* LRC = BCLK/(2*(14+1)) = 96376Hz */
+               break;
+       default:
+               printk(KERN_WARNING "unsupported rate %d"
+                               " on at91sam9g20ek board\n", rate);
+               return -EINVAL;
+       }
+
+       /* set the MCK divider for BCLK */
+       ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_CMR_DIV, cmr_div);
+       if (ret < 0)
+               return ret;
+
+       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+               /* set the BCLK divider for DACLRC */
+               ret = snd_soc_dai_set_clkdiv(cpu_dai,
+                                               ATMEL_SSC_TCMR_PERIOD, period);
+       } else {
+               /* set the BCLK divider for ADCLRC */
+               ret = snd_soc_dai_set_clkdiv(cpu_dai,
+                                               ATMEL_SSC_RCMR_PERIOD, period);
+       }
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+static struct snd_soc_ops at91sam9g20ek_ops = {
+       .startup = at91sam9g20ek_startup,
+       .hw_params = at91sam9g20ek_hw_params,
+       .shutdown = at91sam9g20ek_shutdown,
+};
+
+
+static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
+       SND_SOC_DAPM_MIC("Int Mic", NULL),
+       SND_SOC_DAPM_SPK("Ext Spk", NULL),
+};
+
+static const struct snd_soc_dapm_route intercon[] = {
+
+       /* speaker connected to LHPOUT */
+       {"Ext Spk", NULL, "LHPOUT"},
+
+       /* mic is connected to Mic Jack, with WM8731 Mic Bias */
+       {"MICIN", NULL, "Mic Bias"},
+       {"Mic Bias", NULL, "Int Mic"},
+};
+
+/*
+ * Logic for a wm8731 as connected on a at91sam9g20ek board.
+ */
+static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
+{
+       printk(KERN_DEBUG
+                       "at91sam9g20ek_wm8731 "
+                       ": at91sam9g20ek_wm8731_init() called\n");
+
+       /* Add specific widgets */
+       snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
+                                 ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
+       /* Set up specific audio path interconnects */
+       snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
+
+       /* not connected */
+       snd_soc_dapm_disable_pin(codec, "RLINEIN");
+       snd_soc_dapm_disable_pin(codec, "LLINEIN");
+
+       /* always connected */
+       snd_soc_dapm_enable_pin(codec, "Int Mic");
+       snd_soc_dapm_enable_pin(codec, "Ext Spk");
+
+       snd_soc_dapm_sync(codec);
+
+       return 0;
+}
+
+static struct snd_soc_dai_link at91sam9g20ek_dai = {
+       .name = "WM8731",
+       .stream_name = "WM8731 PCM",
+       .cpu_dai = &atmel_ssc_dai[0],
+       .codec_dai = &wm8731_dai,
+       .init = at91sam9g20ek_wm8731_init,
+       .ops = &at91sam9g20ek_ops,
+};
+
+static struct snd_soc_machine snd_soc_machine_at91sam9g20ek = {
+       .name = "WM8731",
+       .dai_link = &at91sam9g20ek_dai,
+       .num_links = 1,
+};
+
+static struct wm8731_setup_data at91sam9g20ek_wm8731_setup = {
+       .i2c_bus = 0,
+       .i2c_address = 0x1b,
+};
+
+static struct snd_soc_device at91sam9g20ek_snd_devdata = {
+       .machine = &snd_soc_machine_at91sam9g20ek,
+       .platform = &atmel_soc_platform,
+       .codec_dev = &soc_codec_dev_wm8731,
+       .codec_data = &at91sam9g20ek_wm8731_setup,
+};
+
+static struct platform_device *at91sam9g20ek_snd_device;
+
+static int __init at91sam9g20ek_init(void)
+{
+       struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
+       struct ssc_device *ssc = NULL;
+       int ret;
+
+       /*
+        * Request SSC device
+        */
+       ssc = ssc_request(0);
+       if (IS_ERR(ssc)) {
+               ret = PTR_ERR(ssc);
+               ssc = NULL;
+               goto err_ssc;
+       }
+       ssc_p->ssc = ssc;
+
+       at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
+       if (!at91sam9g20ek_snd_device) {
+               printk(KERN_DEBUG
+                               "platform device allocation failed\n");
+               ret = -ENOMEM;
+       }
+
+       platform_set_drvdata(at91sam9g20ek_snd_device,
+                       &at91sam9g20ek_snd_devdata);
+       at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;
+
+       ret = platform_device_add(at91sam9g20ek_snd_device);
+       if (ret) {
+               printk(KERN_DEBUG
+                               "platform device allocation failed\n");
+               platform_device_put(at91sam9g20ek_snd_device);
+       }
+
+       return ret;
+
+err_ssc:
+       return ret;
+}
+
+static void __exit at91sam9g20ek_exit(void)
+{
+       struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
+       struct ssc_device *ssc;
+
+       if (ssc_p != NULL) {
+               ssc = ssc_p->ssc;
+               if (ssc != NULL)
+                       ssc_free(ssc);
+               ssc_p->ssc = NULL;
+       }
+
+       platform_device_unregister(at91sam9g20ek_snd_device);
+       at91sam9g20ek_snd_device = NULL;
+}
+
+module_init(at91sam9g20ek_init);
+module_exit(at91sam9g20ek_exit);
+
+/* Module information */
+MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
+MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
+MODULE_LICENSE("GPL");