It registers hdmi-audio card to ALSA framework which associates i2s dai and cdf based hdmi audio codec.
Signed-off-by: Rahul Sharma rahul.sharma@samsung.com --- sound/soc/samsung/Kconfig | 8 ++ sound/soc/samsung/Makefile | 2 + sound/soc/samsung/hdmi.c | 260 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 sound/soc/samsung/hdmi.c
diff --git a/sound/soc/samsung/Kconfig b/sound/soc/samsung/Kconfig index 90e7e66..d5b92ab 100644 --- a/sound/soc/samsung/Kconfig +++ b/sound/soc/samsung/Kconfig @@ -185,6 +185,14 @@ config SND_SOC_SMDK_WM8994_PCM help Say Y if you want to add support for SoC audio on the SMDK
+config SND_SOC_EXYNOS_HDMI_AUDIO + tristate "SoC I2S Audio support for HDMI" + depends on SND_SOC_SAMSUNG && DRM_EXYNOS_HDMI_CDF + select SND_SAMSUNG_I2S + select SND_SOC_EXYNOS_HDMI_CODEC + help + Say Y if you want to add support for hdmi audio on the Exynos. + config SND_SOC_SPEYSIDE tristate "Audio support for Wolfson Speyside" depends on SND_SOC_SAMSUNG && MACH_WLF_CRAGG_6410 diff --git a/sound/soc/samsung/Makefile b/sound/soc/samsung/Makefile index 709f605..ab1c151 100644 --- a/sound/soc/samsung/Makefile +++ b/sound/soc/samsung/Makefile @@ -8,6 +8,7 @@ snd-soc-s3c-i2s-v2-objs := s3c-i2s-v2.o snd-soc-samsung-spdif-objs := spdif.o snd-soc-pcm-objs := pcm.o snd-soc-i2s-objs := i2s.o +snd-soc-hdmi-objs := hdmi.o
obj-$(CONFIG_SND_SOC_SAMSUNG) += snd-soc-s3c24xx.o obj-$(CONFIG_SND_S3C24XX_I2S) += snd-soc-s3c24xx-i2s.o @@ -18,6 +19,7 @@ obj-$(CONFIG_SND_SAMSUNG_SPDIF) += snd-soc-samsung-spdif.o obj-$(CONFIG_SND_SAMSUNG_PCM) += snd-soc-pcm.o obj-$(CONFIG_SND_SAMSUNG_I2S) += snd-soc-i2s.o obj-$(CONFIG_SND_SAMSUNG_I2S) += snd-soc-idma.o +obj-$(CONFIG_SND_SOC_EXYNOS_HDMI_AUDIO) += snd-soc-hdmi.o
# S3C24XX Machine Support snd-soc-jive-wm8750-objs := jive_wm8750.o diff --git a/sound/soc/samsung/hdmi.c b/sound/soc/samsung/hdmi.c new file mode 100644 index 0000000..a600a84 --- /dev/null +++ b/sound/soc/samsung/hdmi.c @@ -0,0 +1,260 @@ +/* + * ALSA SoC Card driver for HDMI audio on Samsung Exynos processors. + * Copyright (C) 2013 Samsung corp. + * Author: Rahul Sharma rahul.sharma@samsung.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. + * + */ + +#include <linux/module.h> +#include <linux/of.h> +#include <linux/clk.h> + +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#include "i2s.h" + +/* platform device pointer for eynos hdmi audio device. */ +static struct platform_device *exynos_hdmi_audio_pdev; + +static int set_epll_rate(unsigned long rate) +{ + int ret; + struct clk *fout_epll; + + fout_epll = clk_get(NULL, "fout_epll"); + + if (IS_ERR(fout_epll)) + return PTR_ERR(fout_epll); + + if (rate == clk_get_rate(fout_epll)) + goto out; + + ret = clk_set_rate(fout_epll, rate); + if (ret < 0) + goto out; + +out: + clk_put(fout_epll); + + return 0; +} + +static int hdmi_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 *cpu_dai = rtd->cpu_dai; + int bfs, psr, rfs, ret; + unsigned long rclk; + unsigned long xtal; + struct clk *xtal_clk; + + dev_dbg(rtd->dev, "[%d][%s]\n", __LINE__, __func__); + + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_U24: + case SNDRV_PCM_FORMAT_S24: + bfs = 48; + break; + case SNDRV_PCM_FORMAT_U16_LE: + case SNDRV_PCM_FORMAT_S16_LE: + bfs = 32; + break; + default: + return -EINVAL; + } + + switch (params_rate(params)) { + case 16000: + case 22050: + case 24000: + case 32000: + case 44100: + case 48000: + case 88200: + case 96000: + if (bfs == 48) + rfs = 384; + else + rfs = 256; + break; + case 64000: + rfs = 384; + break; + case 8000: + case 11025: + case 12000: + if (bfs == 48) + rfs = 768; + else + rfs = 512; + break; + default: + return -EINVAL; + } + + rclk = params_rate(params) * rfs; + + switch (rclk) { + case 4096000: + case 5644800: + case 6144000: + case 8467200: + case 9216000: + psr = 8; + break; + case 8192000: + case 11289600: + case 12288000: + case 16934400: + case 18432000: + psr = 4; + break; + case 22579200: + case 24576000: + case 33868800: + case 36864000: + psr = 2; + break; + case 67737600: + case 73728000: + psr = 1; + break; + default: + dev_err(rtd->dev, "rclk = %lu is not yet supported!\n", rclk); + return -EINVAL; + } + + ret = set_epll_rate(rclk * psr); + if (ret < 0) + return ret; + + 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; + + xtal_clk = clk_get(NULL, "xtal"); /*xtal clk is input to codec MCLK1*/ + if (IS_ERR(xtal_clk)) { + dev_err(rtd->dev, "%s: failed to get xtal clock\n", __func__); + return PTR_ERR(xtal_clk); + } + + xtal = clk_get_rate(xtal_clk); + clk_put(xtal_clk); + + ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_CDCLK, + 0, SND_SOC_CLOCK_OUT); + if (ret < 0) + return ret; + + ret = snd_soc_dai_set_clkdiv(cpu_dai, SAMSUNG_I2S_DIV_BCLK, bfs); + if (ret < 0) + return ret; + + return 0; +} + +/* + * HDMI DAI operations. + */ +static struct snd_soc_ops hdmi_ops = { + .hw_params = hdmi_hw_params, +}; + +static struct snd_soc_dai_link hdmi_dai[] = { + { /* HDMI Playback i/f */ + .name = "HDMI Playback", + .stream_name = "i2s_Dai", + .cpu_dai_name = "samsung-i2s.0", + .codec_dai_name = "exynos-hdmi-audio-dai", + .platform_name = "samsung-i2s.0", + .codec_name = "exynos-hdmi-audio-codec", + .ops = &hdmi_ops, + }, +}; + +static struct snd_soc_card hdmi = { + .name = "HDMI-AUDIO", + .owner = THIS_MODULE, + .dai_link = hdmi_dai, + .num_links = ARRAY_SIZE(hdmi_dai), +}; + +static int hdmi_audio_probe(struct platform_device *pdev) +{ + int ret; + struct snd_soc_card *card = &hdmi; + + card->dev = &pdev->dev; + dev_dbg(&pdev->dev, "[%d][%s]\n", __LINE__, __func__); + + ret = snd_soc_register_card(card); + if (ret) + dev_err(&pdev->dev, "snd_soc_register_card() failed:%d\n", ret); + + return ret; +} + +static int hdmi_audio_remove(struct platform_device *pdev) +{ + struct snd_soc_card *card = platform_get_drvdata(pdev); + + snd_soc_unregister_card(card); + + return 0; +} + +static struct platform_driver hdmi_audio_driver = { + .driver = { + .name = "exynos-hdmi-audio", + .owner = THIS_MODULE, + .pm = &snd_soc_pm_ops, + }, + .probe = hdmi_audio_probe, + .remove = hdmi_audio_remove, +}; + +static int __init hdmi_audio_init(void) +{ + int ret; + + ret = platform_driver_register(&hdmi_audio_driver); + if (ret < 0) + return -EINVAL; + + exynos_hdmi_audio_pdev = platform_device_register_simple + ("exynos-hdmi-audio", -1, NULL, 0); + if (IS_ERR_OR_NULL(exynos_hdmi_audio_pdev)) { + ret = PTR_ERR(exynos_hdmi_audio_pdev); + platform_driver_unregister(&hdmi_audio_driver); + return ret; + } + + return 0; +} + +static void __exit hdmi_audio_exit(void) +{ + platform_driver_unregister(&hdmi_audio_driver); + platform_device_unregister(exynos_hdmi_audio_pdev); +} + +module_init(hdmi_audio_init); +module_exit(hdmi_audio_exit); + +MODULE_AUTHOR("Rahul Sharma rahul.sharma@samsung.com"); +MODULE_DESCRIPTION("ALSA SoC HDMI AUDIO Card"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:hdmi-audio");