ASoC: omap-twl4030: Simple machine driver for TI SoC with twl4030 codec

Machine driver to handle simple devices using twl4030 as audio codec.
The driver supports the following boards:
- Beagleboard or Devkit8000
- Gumstix Overo or CompuLab CM-T35/CM-T3730
- IGEP v2
- OMAP3EVM

All of these boards can be switched to use this driver since their setup is
identical.
Devicetree support for the omap-twl4030 machine driver also implemented.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 188 insertions, 0 deletions

diff --git a/sound/soc/omap/omap-twl4030.c b/sound/soc/omap/omap-twl4030.c
new file mode 100644
index 000000000000..3b97b87971f5
--- /dev/null
+++ b/sound/soc/omap/omap-twl4030.c
@@ -0,0 +1,188 @@
+/*
+ * omap-twl4030.c  --  SoC audio for TI SoC based boards with twl4030 codec
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
+ * All rights reserved.
+ *
+ * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
+ *
+ * This driver replaces the following machine drivers:
+ * omap3beagle (Author: Steve Sakoman <steve@sakoman.com>)
+ * omap3evm (Author: Anuj Aggarwal <anuj.aggarwal@ti.com>)
+ * overo (Author: Steve Sakoman <steve@sakoman.com>)
+ * igep0020 (Author: Enric Balletbo i Serra <eballetbo@iseebcn.com>)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/platform_data/omap-twl4030.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+
+#include "omap-mcbsp.h"
+#include "omap-pcm.h"
+
+static int omap_twl4030_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->codec_dai;
+        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+        struct snd_soc_codec *codec = rtd->codec;
+        struct snd_soc_card *card = codec->card;
+        unsigned int fmt;
+        int ret;
+
+        switch (params_channels(params)) {
+        case 2: /* Stereo I2S mode */
+                fmt =   SND_SOC_DAIFMT_I2S |
+                        SND_SOC_DAIFMT_NB_NF |
+                        SND_SOC_DAIFMT_CBM_CFM;
+                break;
+        case 4: /* Four channel TDM mode */
+                fmt =   SND_SOC_DAIFMT_DSP_A |
+                        SND_SOC_DAIFMT_IB_NF |
+                        SND_SOC_DAIFMT_CBM_CFM;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        /* Set codec DAI configuration */
+        ret = snd_soc_dai_set_fmt(codec_dai, fmt);
+        if (ret < 0) {
+                dev_err(card->dev, "can't set codec DAI configuration\n");
+                return ret;
+        }
+
+        /* Set cpu DAI configuration */
+        ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
+        if (ret < 0) {
+                dev_err(card->dev, "can't set cpu DAI configuration\n");
+                return ret;
+        }
+
+        return 0;
+}
+
+static struct snd_soc_ops omap_twl4030_ops = {
+        .hw_params = omap_twl4030_hw_params,
+};
+
+/* Digital audio interface glue - connects codec <--> CPU */
+static struct snd_soc_dai_link omap_twl4030_dai_links[] = {
+        {
+                .name = "TWL4030",
+                .stream_name = "TWL4030",
+                .cpu_dai_name = "omap-mcbsp.2",
+                .codec_dai_name = "twl4030-hifi",
+                .platform_name = "omap-pcm-audio",
+                .codec_name = "twl4030-codec",
+                .ops = &omap_twl4030_ops,
+        },
+};
+
+/* Audio machine driver */
+static struct snd_soc_card omap_twl4030_card = {
+        .owner = THIS_MODULE,
+        .dai_link = omap_twl4030_dai_links,
+        .num_links = ARRAY_SIZE(omap_twl4030_dai_links),
+};
+
+static __devinit int omap_twl4030_probe(struct platform_device *pdev)
+{
+        struct omap_tw4030_pdata *pdata = dev_get_platdata(&pdev->dev);
+        struct device_node *node = pdev->dev.of_node;
+        struct snd_soc_card *card = &omap_twl4030_card;
+        int ret = 0;
+
+        card->dev = &pdev->dev;
+
+        if (node) {
+                struct device_node *dai_node;
+
+                if (snd_soc_of_parse_card_name(card, "ti,model")) {
+                        dev_err(&pdev->dev, "Card name is not provided\n");
+                        return -ENODEV;
+                }
+
+                dai_node = of_parse_phandle(node, "ti,mcbsp", 0);
+                if (!dai_node) {
+                        dev_err(&pdev->dev, "McBSP node is not provided\n");
+                        return -EINVAL;
+                }
+                omap_twl4030_dai_links[0].cpu_dai_name  = NULL;
+                omap_twl4030_dai_links[0].cpu_of_node = dai_node;
+
+        } else if (pdata) {
+                if (pdata->card_name) {
+                        card->name = pdata->card_name;
+                } else {
+                        dev_err(&pdev->dev, "Card name is not provided\n");
+                        return -ENODEV;
+                }
+        } else {
+                dev_err(&pdev->dev, "Missing pdata\n");
+                return -ENODEV;
+        }
+
+        ret = snd_soc_register_card(card);
+        if (ret) {
+                dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+                        ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int __devexit omap_twl4030_remove(struct platform_device *pdev)
+{
+        struct snd_soc_card *card = platform_get_drvdata(pdev);
+
+        snd_soc_unregister_card(card);
+
+        return 0;
+}
+
+static const struct of_device_id omap_twl4030_of_match[] = {
+        {.compatible = "ti,omap-twl4030", },
+        { },
+};
+MODULE_DEVICE_TABLE(of, omap_twl4030_of_match);
+
+static struct platform_driver omap_twl4030_driver = {
+        .driver = {
+                .name = "omap-twl4030",
+                .owner = THIS_MODULE,
+                .pm = &snd_soc_pm_ops,
+                .of_match_table = omap_twl4030_of_match,
+        },
+        .probe = omap_twl4030_probe,
+        .remove = __devexit_p(omap_twl4030_remove),
+};
+
+module_platform_driver(omap_twl4030_driver);
+
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
+MODULE_DESCRIPTION("ALSA SoC for TI SoC based boards with twl4030 codec");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:omap-twl4030");