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64 lines
2.0 KiB
Diff
64 lines
2.0 KiB
Diff
From 6eb24a344f83c6b0768e6e63fa1865d3f444ed5a Mon Sep 17 00:00:00 2001
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From: Matthias Reichl <hias@horus.com>
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Date: Sun, 11 Oct 2015 15:35:20 +0200
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Subject: [PATCH 018/304] bcm2835-i2s: Register PCM device
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Code ported from bcm2708-i2s driver in Raspberry Pi tree.
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RPi commit ba46b4935a23aa2caac1855ead52a035d4776680 ("ASoC: Add
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support for BCM2708")
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This driver adds support for digital audio (I2S)
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for the BCM2708 SoC that is used by the
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Raspberry Pi. External audio codecs can be
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connected to the Raspberry Pi via P5 header.
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It relies on cyclic DMA engine support for BCM2708.
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Signed-off-by: Florian Meier <florian.meier@koalo.de>
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Signed-off-by: Matthias Reichl <hias@horus.com>
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---
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sound/soc/bcm/bcm2835-i2s.c | 23 ++++++++++++++++++++++-
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1 file changed, 22 insertions(+), 1 deletion(-)
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--- a/sound/soc/bcm/bcm2835-i2s.c
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+++ b/sound/soc/bcm/bcm2835-i2s.c
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@@ -799,6 +799,25 @@ static const struct snd_soc_component_dr
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.name = "bcm2835-i2s-comp",
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};
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+static const struct snd_pcm_hardware bcm2835_pcm_hardware = {
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+ .info = SNDRV_PCM_INFO_INTERLEAVED |
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+ SNDRV_PCM_INFO_JOINT_DUPLEX,
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+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
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+ SNDRV_PCM_FMTBIT_S24_LE |
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+ SNDRV_PCM_FMTBIT_S32_LE,
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+ .period_bytes_min = 32,
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+ .period_bytes_max = 64 * PAGE_SIZE,
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+ .periods_min = 2,
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+ .periods_max = 255,
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+ .buffer_bytes_max = 128 * PAGE_SIZE,
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+};
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+
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+static const struct snd_dmaengine_pcm_config bcm2835_dmaengine_pcm_config = {
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+ .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
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+ .pcm_hardware = &bcm2835_pcm_hardware,
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+ .prealloc_buffer_size = 256 * PAGE_SIZE,
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+};
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+
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static int bcm2835_i2s_probe(struct platform_device *pdev)
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{
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struct bcm2835_i2s_dev *dev;
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@@ -870,7 +889,9 @@ static int bcm2835_i2s_probe(struct plat
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return ret;
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}
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- ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
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+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
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+ &bcm2835_dmaengine_pcm_config,
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+ SND_DMAENGINE_PCM_FLAG_COMPAT);
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if (ret) {
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dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
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return ret;
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