linux-kernel - [RFC][PATCH 09/10 v2] ASoC: hisilicon: Add hi6210 hdmi codec driver

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Date:	Tue, 19 Jul 2016 16:22:45 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Zhangfei Gao <zhangfei.gao@...aro.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, Wei Xu <xuwei5@...ilicon.com>,
	Rob Herring <robh+dt@...nel.org>,
	Andy Green <andy@...mcat.com>,
	Andy Green <andy.green@...aro.org>
Subject: [RFC][PATCH 09/10 v2] ASoC: hisilicon: Add hi6210 hdmi codec driver

Add codec driver for hi6210 hdmi audio output on hi6220 boards.

This seems like a lot of code just to fill and register a
snd_soc_dai_driver to 2 channel, 16bits, 48k. I suspect there's
a better way.

Cc: Zhangfei Gao <zhangfei.gao@...aro.org>
Cc: Jingoo Han <jg1.han@...sung.com>
Cc: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc: Vinod Koul <vinod.koul@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Liam Girdwood <lgirdwood@...il.com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Jaroslav Kysela <perex@...ex.cz>
Cc: Takashi Iwai <tiwai@...e.com>
Cc: Wei Xu <xuwei5@...ilicon.com>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Andy Green <andy@...mcat.com>
Signed-off-by: Andy Green <andy.green@...aro.org>
[jstultz: Forward ported to mainline, split out and reworked]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
v2:
* Folded in fixes from kbuildbot
* Split i2s and hdmi-card drivers up
* Refactored and cut down to just be a codec driver

 sound/soc/hisilicon/Makefile            |  3 +-
 sound/soc/hisilicon/hi6210-hdmi-codec.c | 68 +++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 sound/soc/hisilicon/hi6210-hdmi-codec.c

diff --git a/sound/soc/hisilicon/Makefile b/sound/soc/hisilicon/Makefile
index e8095e2..c253775 100644
--- a/sound/soc/hisilicon/Makefile
+++ b/sound/soc/hisilicon/Makefile
@@ -1 +1,2 @@
-obj-$(CONFIG_SND_I2S_HI6210_I2S) += hi6210-i2s.o
+obj-$(CONFIG_SND_I2S_HI6210_I2S) += hi6210-i2s.o \
+				    hi6210-hdmi-codec.o
diff --git a/sound/soc/hisilicon/hi6210-hdmi-codec.c b/sound/soc/hisilicon/hi6210-hdmi-codec.c
new file mode 100644
index 0000000..5dd54e1
--- /dev/null
+++ b/sound/soc/hisilicon/hi6210-hdmi-codec.c
@@ -0,0 +1,68 @@
+/*
+ * linux/sound/soc/hisilicon/hi6210-hdmi-codec.c
+ *
+ * Copyright (C) 2015 Linaro, 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, version 2 of the License.
+ */
+
+#include <linux/module.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+
+static struct snd_soc_dai_driver hi6210_hdmi_dai = {
+	.name = "hi6210_hdmi_dai",
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_48000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+};
+
+static struct snd_soc_codec_driver hi6210_hdmi_codec;
+
+static int hi6210_hdmi_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = snd_soc_register_codec(&pdev->dev, &hi6210_hdmi_codec,
+			&hi6210_hdmi_dai, 1);
+	if (ret) {
+		dev_err(&pdev->dev, "snd_soc_register_codec failed (%d)\n",
+					ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int hi6210_hdmi_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_codec(&pdev->dev);
+	return 0;
+}
+
+static const struct of_device_id hi6210_hdmi_dt_ids[] = {
+	{ .compatible = "hisilicon,hi6210-hdmi-audio-codec" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, hi6210_hdmi_dt_ids);
+
+static struct platform_driver hi6210_hdmi_driver = {
+	.driver = {
+		.name = "hi6210-hdmi-audio",
+		.of_match_table = hi6210_hdmi_dt_ids,
+	},
+	.probe = hi6210_hdmi_probe,
+	.remove = hi6210_hdmi_remove,
+};
+
+module_platform_driver(hi6210_hdmi_driver);
+
+MODULE_AUTHOR("andy.green@...aro.org");
+MODULE_DESCRIPTION("Hisilicon HDMI codec driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:hi6210-hdmi-audio");
-- 
1.9.1