From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russell King Subject: [PATCH RFC 09/11] sound/core: add IEC958 channel status helper Date: Mon, 30 Mar 2015 20:40:42 +0100 Message-ID: References: <20150330193911.GM24899@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from pandora.arm.linux.org.uk (pandora.arm.linux.org.uk [78.32.30.218]) by alsa0.perex.cz (Postfix) with ESMTP id 8D5F0260688 for ; Mon, 30 Mar 2015 21:40:56 +0200 (CEST) In-Reply-To: <20150330193911.GM24899@n2100.arm.linux.org.uk> Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org Cc: Fabio Estevam , Takashi Iwai , Mark Brown , Philipp Zabel , Yakir Yang List-Id: alsa-devel@alsa-project.org Add a helper to create the IEC958 channel status from an ALSA snd_pcm_runtime structure, taking account of the sample rate. Signed-off-by: Russell King --- include/sound/pcm_iec958.h | 9 ++++++ sound/core/Kconfig | 3 ++ sound/core/Makefile | 2 ++ sound/core/pcm_iec958.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 84 insertions(+) create mode 100644 include/sound/pcm_iec958.h create mode 100644 sound/core/pcm_iec958.c diff --git a/include/sound/pcm_iec958.h b/include/sound/pcm_iec958.h new file mode 100644 index 000000000000..0eed397aca8e --- /dev/null +++ b/include/sound/pcm_iec958.h @@ -0,0 +1,9 @@ +#ifndef __SOUND_PCM_IEC958_H +#define __SOUND_PCM_IEC958_H + +#include + +int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs, + size_t len); + +#endif diff --git a/sound/core/Kconfig b/sound/core/Kconfig index b534c8a6046b..1507469425ec 100644 --- a/sound/core/Kconfig +++ b/sound/core/Kconfig @@ -9,6 +9,9 @@ config SND_PCM config SND_PCM_ELD bool +config SND_PCM_IEC958 + bool + config SND_DMAENGINE_PCM tristate diff --git a/sound/core/Makefile b/sound/core/Makefile index 591b49157b4d..70ea06712ec2 100644 --- a/sound/core/Makefile +++ b/sound/core/Makefile @@ -14,10 +14,12 @@ snd-pcm-y := pcm.o pcm_native.o pcm_lib.o pcm_timer.o pcm_misc.o \ pcm_memory.o memalloc.o snd-pcm-$(CONFIG_SND_DMA_SGBUF) += sgbuf.o snd-pcm-$(CONFIG_SND_PCM_ELD) += pcm_drm_eld.o +snd-pcm-$(CONFIG_SND_PCM_IEC958) += snd-pcm-iec958.o # for trace-points CFLAGS_pcm_lib.o := -I$(src) +snd-pcm-iec958-objs := pcm_iec958.o snd-pcm-dmaengine-objs := pcm_dmaengine.o snd-rawmidi-objs := rawmidi.o diff --git a/sound/core/pcm_iec958.c b/sound/core/pcm_iec958.c new file mode 100644 index 000000000000..e1ff88a17dde --- /dev/null +++ b/sound/core/pcm_iec958.c @@ -0,0 +1,70 @@ +/* + * PCM DRM helpers + * + * 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. + */ +#include +#include +#include +#include +#include + +/** + * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status + * @runtime: pcm runtime structure with ->rate filled in + * @cs: channel status buffer, at least four bytes + * @len: length of channel status buffer + * + * Create the consumer format channel status data in @cs of maximum size + * @len corresponding to the parameters of the PCM runtime @runtime. + * + * Drivers may wish to tweak the contents of the buffer after creation. + * + * Returns: length of buffer, or negative error code if something failed. + */ +int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs, + size_t len) +{ + unsigned int fs; + + if (len < 4) + return -EINVAL; + + switch (runtime->rate) { + case 32000: + fs = IEC958_AES3_CON_FS_32000; + break; + case 44100: + fs = IEC958_AES3_CON_FS_44100; + break; + case 48000: + fs = IEC958_AES3_CON_FS_48000; + break; + case 88200: + fs = IEC958_AES3_CON_FS_88200; + break; + case 96000: + fs = IEC958_AES3_CON_FS_96000; + break; + case 176400: + fs = IEC958_AES3_CON_FS_176400; + break; + case 192000: + fs = IEC958_AES3_CON_FS_192000; + break; + default: + return -EINVAL; + } + + memset(cs, 0, len); + + cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE; + cs[1] = IEC958_AES1_CON_GENERAL; + cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC; + cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | fs; + + return len; +} +EXPORT_SYMBOL(snd_pcm_create_iec958_consumer); -- 1.8.3.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: rmk+kernel@arm.linux.org.uk (Russell King) Date: Mon, 30 Mar 2015 20:40:42 +0100 Subject: [PATCH RFC 09/11] sound/core: add IEC958 channel status helper In-Reply-To: <20150330193911.GM24899@n2100.arm.linux.org.uk> References: <20150330193911.GM24899@n2100.arm.linux.org.uk> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Add a helper to create the IEC958 channel status from an ALSA snd_pcm_runtime structure, taking account of the sample rate. Signed-off-by: Russell King --- include/sound/pcm_iec958.h | 9 ++++++ sound/core/Kconfig | 3 ++ sound/core/Makefile | 2 ++ sound/core/pcm_iec958.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 84 insertions(+) create mode 100644 include/sound/pcm_iec958.h create mode 100644 sound/core/pcm_iec958.c diff --git a/include/sound/pcm_iec958.h b/include/sound/pcm_iec958.h new file mode 100644 index 000000000000..0eed397aca8e --- /dev/null +++ b/include/sound/pcm_iec958.h @@ -0,0 +1,9 @@ +#ifndef __SOUND_PCM_IEC958_H +#define __SOUND_PCM_IEC958_H + +#include + +int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs, + size_t len); + +#endif diff --git a/sound/core/Kconfig b/sound/core/Kconfig index b534c8a6046b..1507469425ec 100644 --- a/sound/core/Kconfig +++ b/sound/core/Kconfig @@ -9,6 +9,9 @@ config SND_PCM config SND_PCM_ELD bool +config SND_PCM_IEC958 + bool + config SND_DMAENGINE_PCM tristate diff --git a/sound/core/Makefile b/sound/core/Makefile index 591b49157b4d..70ea06712ec2 100644 --- a/sound/core/Makefile +++ b/sound/core/Makefile @@ -14,10 +14,12 @@ snd-pcm-y := pcm.o pcm_native.o pcm_lib.o pcm_timer.o pcm_misc.o \ pcm_memory.o memalloc.o snd-pcm-$(CONFIG_SND_DMA_SGBUF) += sgbuf.o snd-pcm-$(CONFIG_SND_PCM_ELD) += pcm_drm_eld.o +snd-pcm-$(CONFIG_SND_PCM_IEC958) += snd-pcm-iec958.o # for trace-points CFLAGS_pcm_lib.o := -I$(src) +snd-pcm-iec958-objs := pcm_iec958.o snd-pcm-dmaengine-objs := pcm_dmaengine.o snd-rawmidi-objs := rawmidi.o diff --git a/sound/core/pcm_iec958.c b/sound/core/pcm_iec958.c new file mode 100644 index 000000000000..e1ff88a17dde --- /dev/null +++ b/sound/core/pcm_iec958.c @@ -0,0 +1,70 @@ +/* + * PCM DRM helpers + * + * 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. + */ +#include +#include +#include +#include +#include + +/** + * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status + * @runtime: pcm runtime structure with ->rate filled in + * @cs: channel status buffer, at least four bytes + * @len: length of channel status buffer + * + * Create the consumer format channel status data in @cs of maximum size + * @len corresponding to the parameters of the PCM runtime @runtime. + * + * Drivers may wish to tweak the contents of the buffer after creation. + * + * Returns: length of buffer, or negative error code if something failed. + */ +int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs, + size_t len) +{ + unsigned int fs; + + if (len < 4) + return -EINVAL; + + switch (runtime->rate) { + case 32000: + fs = IEC958_AES3_CON_FS_32000; + break; + case 44100: + fs = IEC958_AES3_CON_FS_44100; + break; + case 48000: + fs = IEC958_AES3_CON_FS_48000; + break; + case 88200: + fs = IEC958_AES3_CON_FS_88200; + break; + case 96000: + fs = IEC958_AES3_CON_FS_96000; + break; + case 176400: + fs = IEC958_AES3_CON_FS_176400; + break; + case 192000: + fs = IEC958_AES3_CON_FS_192000; + break; + default: + return -EINVAL; + } + + memset(cs, 0, len); + + cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE; + cs[1] = IEC958_AES1_CON_GENERAL; + cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC; + cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | fs; + + return len; +} +EXPORT_SYMBOL(snd_pcm_create_iec958_consumer); -- 1.8.3.1