[V2] ASoC: SAMSUNG: Add sound card driver for Snow board

Message ID 1398243705-31151-1-git-send-email-tushar.behera@linaro.org
State New
Headers show

Commit Message

Tushar Behera April 23, 2014, 9:01 a.m.
Added machine driver to instantiate I2S based sound card on Snow
board. It has MAX98095 audio codec on board.

There are some other variants for Snow board which have MAX98090
audio codec. Hence support for MAX98090 is also added to this
driver.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
---
Changes for V2:
Addressed various comments from Mark Brown.
1. Moved DAIFMT flags to dai_link. Removed snd_soc_dai_set_fmt calls.
2. Removed BCLK settings.
3. Moved sysclk settings to late_probe.
4. Removed now empty snow_hw_params.
5. Removed snow_init
6. Used devm_snd_soc_register_card. Also removed empty remove function.
7. Removed non-DT handling as the driver is DT only.

Additional nits:
1. Renamed snow_driver_probe to snow_probe
2. Removed unused pm_ops.
3. Updated clock settings for I2S block (Earlier it was I2S_CDCLK,
   whereas it should be I2S_RCLKSRC_0).
4. Removed 'card-name' DT property as it was not used in earlier
   sound-card driver DT bindings. Will be added later.

 Documentation/devicetree/bindings/sound/snow.txt |   17 +++
 sound/soc/samsung/Kconfig                        |   10 ++
 sound/soc/samsung/Makefile                       |    2 +
 sound/soc/samsung/snow.c                         |  129 ++++++++++++++++++++++
 4 files changed, 158 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/snow.txt
 create mode 100644 sound/soc/samsung/snow.c

Comments

Mark Brown April 24, 2014, 1:39 p.m. | #1
On Wed, Apr 23, 2014 at 02:31:45PM +0530, Tushar Behera wrote:

> +Required properties:
> +- compatible : Can be one of the following,
> +			"google,snow-audio-max98090" or
> +			"google,snow-audio-max98095"
> +- samsung,i2s-controller: The phandle of the Samsung I2S0 controller

This should be any I2S controller, not just I2S0?

> +- samsung,audio-codec: The phandle of the audio codec

This binding only has one I2S controller and CODEC.  However...

> +static struct snd_soc_dai_link snow_dai[] = {
> +	{ /* Playback DAI i/f */
> +		.name = "Playback",
> +		.stream_name = "Playback",
> +		.codec_dai_name = "HiFi",
> +		.dai_fmt = SND_SOC_DAIFMT_I2S |
> +				SND_SOC_DAIFMT_NB_NF |
> +				SND_SOC_DAIFMT_CBS_CFS,
> +	}, { /* Capture DAI i/f */
> +		.name = "Capture",
> +		.stream_name = "Capture",
> +		.codec_dai_name = "HiFi",
> +		.dai_fmt = SND_SOC_DAIFMT_I2S |
> +				SND_SOC_DAIFMT_NB_NF |
> +				SND_SOC_DAIFMT_CBS_CFS,
> +	},
> +};

...for some reason we have separate capture and playback DAI links
defined.  Why is that?  Also, why is the secondary I2S playback stream
not supported (this may be a reason to restrict to only the one I2S
interface)?

Please also use subject lines consistent with the subsystem - NO NEED TO
SHOUT.
Tushar Behera April 25, 2014, 4:16 a.m. | #2
On 04/24/2014 07:09 PM, Mark Brown wrote:
> On Wed, Apr 23, 2014 at 02:31:45PM +0530, Tushar Behera wrote:
> 
>> +Required properties:
>> +- compatible : Can be one of the following,
>> +			"google,snow-audio-max98090" or
>> +			"google,snow-audio-max98095"
>> +- samsung,i2s-controller: The phandle of the Samsung I2S0 controller
> 
> This should be any I2S controller, not just I2S0?
> 

Yes, right. It can be any I2S controller. Just that, right now it is
wired to I2S0.

>> +- samsung,audio-codec: The phandle of the audio codec
> 
> This binding only has one I2S controller and CODEC.  However...
> 
>> +static struct snd_soc_dai_link snow_dai[] = {
>> +	{ /* Playback DAI i/f */
>> +		.name = "Playback",
>> +		.stream_name = "Playback",
>> +		.codec_dai_name = "HiFi",
>> +		.dai_fmt = SND_SOC_DAIFMT_I2S |
>> +				SND_SOC_DAIFMT_NB_NF |
>> +				SND_SOC_DAIFMT_CBS_CFS,
>> +	}, { /* Capture DAI i/f */
>> +		.name = "Capture",
>> +		.stream_name = "Capture",
>> +		.codec_dai_name = "HiFi",
>> +		.dai_fmt = SND_SOC_DAIFMT_I2S |
>> +				SND_SOC_DAIFMT_NB_NF |
>> +				SND_SOC_DAIFMT_CBS_CFS,
>> +	},
>> +};
> 
> ...for some reason we have separate capture and playback DAI links

That was lack of understanding from my side. I was of the impression
that the back-end uses different DAI interfaces for aplay and arecord,
which certainly is not the case. I will remove the 'Capture' dai and
make 'Playback' dai as the primary DAI.

> defined.  Why is that?  Also, why is the secondary I2S playback stream
> not supported (this may be a reason to restrict to only the one I2S
> interface)?

AFAICS, I2S driver doesn't support secondary DAI with DT (dai type is
always TYPE_PRI in case of DT). Hence I could not find a setup to test
secondary dai with this board.

> 
> Please also use subject lines consistent with the subsystem - NO NEED TO
> SHOUT.
> 

Noted, will take care.

Thanks.
Mark Brown April 29, 2014, 10:29 p.m. | #3
On Fri, Apr 25, 2014 at 09:46:11AM +0530, Tushar Behera wrote:
> On 04/24/2014 07:09 PM, Mark Brown wrote:

> > defined.  Why is that?  Also, why is the secondary I2S playback stream
> > not supported (this may be a reason to restrict to only the one I2S
> > interface)?

> AFAICS, I2S driver doesn't support secondary DAI with DT (dai type is
> always TYPE_PRI in case of DT). Hence I could not find a setup to test
> secondary dai with this board.

OK, that should be fixed at some point.  I will hopefully be able to
look at this myself on the Arndale Octa though (or Chromebook or Arndale
once XCLKOUT is implemented).

Patch

diff --git a/Documentation/devicetree/bindings/sound/snow.txt b/Documentation/devicetree/bindings/sound/snow.txt
new file mode 100644
index 0000000..6f3fd02
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/snow.txt
@@ -0,0 +1,17 @@ 
+Audio Binding for Snow boards
+
+Required properties:
+- compatible : Can be one of the following,
+			"google,snow-audio-max98090" or
+			"google,snow-audio-max98095"
+- samsung,i2s-controller: The phandle of the Samsung I2S0 controller
+- samsung,audio-codec: The phandle of the audio codec
+
+Example:
+
+sound {
+		compatible = "google,snow-audio-max98095";
+
+		samsung,i2s-controller = <&i2s0>;
+		samsung,audio-codec = <&max98095>;
+};
diff --git a/sound/soc/samsung/Kconfig b/sound/soc/samsung/Kconfig
index f2e2891..50aa289 100644
--- a/sound/soc/samsung/Kconfig
+++ b/sound/soc/samsung/Kconfig
@@ -231,3 +231,13 @@  config SND_SOC_LITTLEMILL
 	select SND_SAMSUNG_I2S
 	select MFD_WM8994
 	select SND_SOC_WM8994
+
+config SND_SOC_SNOW
+	tristate "Audio support for Google Snow boards"
+	depends on SND_SOC_SAMSUNG
+	select SND_SOC_MAX98090
+	select SND_SOC_MAX98095
+	select SND_SAMSUNG_I2S
+	help
+	  Say Y if you want to add audio support for various Snow
+	  boards based on Exynos5 series of SoCs.
diff --git a/sound/soc/samsung/Makefile b/sound/soc/samsung/Makefile
index 86715d8..6d0212b 100644
--- a/sound/soc/samsung/Makefile
+++ b/sound/soc/samsung/Makefile
@@ -34,6 +34,7 @@  snd-soc-h1940-uda1380-objs := h1940_uda1380.o
 snd-soc-rx1950-uda1380-objs := rx1950_uda1380.o
 snd-soc-smdk-wm8580-objs := smdk_wm8580.o
 snd-soc-smdk-wm8994-objs := smdk_wm8994.o
+snd-soc-snow-objs := snow.o
 snd-soc-smdk-wm9713-objs := smdk_wm9713.o
 snd-soc-s3c64xx-smartq-wm8987-objs := smartq_wm8987.o
 snd-soc-goni-wm8994-objs := goni_wm8994.o
@@ -58,6 +59,7 @@  obj-$(CONFIG_SND_SOC_SAMSUNG_H1940_UDA1380) += snd-soc-h1940-uda1380.o
 obj-$(CONFIG_SND_SOC_SAMSUNG_RX1950_UDA1380) += snd-soc-rx1950-uda1380.o
 obj-$(CONFIG_SND_SOC_SAMSUNG_SMDK_WM8580) += snd-soc-smdk-wm8580.o
 obj-$(CONFIG_SND_SOC_SAMSUNG_SMDK_WM8994) += snd-soc-smdk-wm8994.o
+obj-$(CONFIG_SND_SOC_SNOW) += snd-soc-snow.o
 obj-$(CONFIG_SND_SOC_SAMSUNG_SMDK_WM9713) += snd-soc-smdk-wm9713.o
 obj-$(CONFIG_SND_SOC_SMARTQ) += snd-soc-s3c64xx-smartq-wm8987.o
 obj-$(CONFIG_SND_SOC_SAMSUNG_SMDK_SPDIF) += snd-soc-smdk-spdif.o
diff --git a/sound/soc/samsung/snow.c b/sound/soc/samsung/snow.c
new file mode 100644
index 0000000..e1a4b45
--- /dev/null
+++ b/sound/soc/samsung/snow.c
@@ -0,0 +1,129 @@ 
+/*
+ * ASoC machine driver for Snow boards
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <sound/soc.h>
+
+#include "i2s.h"
+
+#define FIN_PLL_RATE		24000000
+
+static struct snd_soc_dai_link snow_dai[] = {
+	{ /* Playback DAI i/f */
+		.name = "Playback",
+		.stream_name = "Playback",
+		.codec_dai_name = "HiFi",
+		.dai_fmt = SND_SOC_DAIFMT_I2S |
+				SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+	}, { /* Capture DAI i/f */
+		.name = "Capture",
+		.stream_name = "Capture",
+		.codec_dai_name = "HiFi",
+		.dai_fmt = SND_SOC_DAIFMT_I2S |
+				SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+	},
+};
+
+static int snow_late_probe(struct snd_soc_card *card)
+{
+	struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
+	struct snd_soc_dai *cpu_dai = card->rtd[0].cpu_dai;
+	int ret;
+
+	/* Set the MCLK rate for the codec */
+	ret = snd_soc_dai_set_sysclk(codec_dai, 0,
+					FIN_PLL_RATE, SND_SOC_CLOCK_IN);
+	if (ret < 0)
+		return ret;
+
+	/* Select I2S Bus clock to set RCLK and BCLK */
+	ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_RCLKSRC_0,
+					0, SND_SOC_CLOCK_IN);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct snd_soc_card snow_snd = {
+	.name = "Snow-I2S",
+	.dai_link = snow_dai,
+	.num_links = ARRAY_SIZE(snow_dai),
+
+	.late_probe = snow_late_probe,
+};
+
+static int snow_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = &snow_snd;
+	struct device_node *i2s_node, *codec_node;
+	int i, ret;
+
+	i2s_node = of_parse_phandle(pdev->dev.of_node,
+				    "samsung,i2s-controller", 0);
+	if (!i2s_node) {
+		dev_err(&pdev->dev,
+			"Property 'i2s-controller' missing or invalid\n");
+		return -EINVAL;
+	}
+
+	codec_node = of_parse_phandle(pdev->dev.of_node,
+				      "samsung,audio-codec", 0);
+	if (!codec_node) {
+		dev_err(&pdev->dev,
+			"Property 'audio-codec' missing or invalid\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(snow_dai); i++) {
+		snow_dai[i].codec_of_node = codec_node;
+		snow_dai[i].cpu_of_node = i2s_node;
+		snow_dai[i].platform_of_node = i2s_node;
+	}
+
+	card->dev = &pdev->dev;
+
+	ret = devm_snd_soc_register_card(&pdev->dev, card);
+	if (ret) {
+		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+static const struct of_device_id snow_of_match[] = {
+	{ .compatible = "google,snow-audio-max98090", },
+	{ .compatible = "google,snow-audio-max98095", },
+	{},
+};
+
+static struct platform_driver snow_driver = {
+	.driver = {
+		.name = "snow-audio",
+		.owner = THIS_MODULE,
+		.of_match_table = snow_of_match,
+	},
+	.probe = snow_probe,
+};
+
+module_platform_driver(snow_driver);
+
+MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
+MODULE_LICENSE("GPL");