97 lines
2.9 KiB
Diff
97 lines
2.9 KiB
Diff
From 2aa4bd3751f6792bf00d59e4d9cd8a5550872cdb Mon Sep 17 00:00:00 2001
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From: popcornmix <popcornmix@gmail.com>
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Date: Fri, 15 Mar 2019 21:11:10 +0000
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Subject: [PATCH] Revert "staging: bcm2835-audio: Drop DT dependency"
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This reverts commit b7491a9fca2dc2535b9dc922550a37c5baae9d3d.
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---
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.../vc04_services/bcm2835-audio/bcm2835.c | 31 +++++++++++++------
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1 file changed, 22 insertions(+), 9 deletions(-)
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--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
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+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
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@@ -6,13 +6,13 @@
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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+#include <linux/of.h>
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#include "bcm2835.h"
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static bool enable_hdmi;
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static bool enable_headphones;
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static bool enable_compat_alsa = true;
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-static int num_channels = MAX_SUBSTREAMS;
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module_param(enable_hdmi, bool, 0444);
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MODULE_PARM_DESC(enable_hdmi, "Enables HDMI virtual audio device");
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@@ -21,8 +21,6 @@ MODULE_PARM_DESC(enable_headphones, "Ena
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module_param(enable_compat_alsa, bool, 0444);
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MODULE_PARM_DESC(enable_compat_alsa,
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"Enables ALSA compatibility virtual audio device");
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-module_param(num_channels, int, 0644);
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-MODULE_PARM_DESC(num_channels, "Number of audio channels (default: 8)");
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static void bcm2835_devm_free_vchi_ctx(struct device *dev, void *res)
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{
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@@ -296,19 +294,28 @@ static int snd_add_child_devices(struct
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static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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+ u32 numchans;
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int err;
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- if (num_channels <= 0 || num_channels > MAX_SUBSTREAMS) {
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- num_channels = MAX_SUBSTREAMS;
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- dev_warn(dev, "Illegal num_channels value, will use %u\n",
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- num_channels);
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+ err = of_property_read_u32(dev->of_node, "brcm,pwm-channels",
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+ &numchans);
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+ if (err) {
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+ dev_err(dev, "Failed to get DT property 'brcm,pwm-channels'");
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+ return err;
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+ }
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+
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+ if (numchans == 0 || numchans > MAX_SUBSTREAMS) {
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+ numchans = MAX_SUBSTREAMS;
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+ dev_warn(dev,
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+ "Illegal 'brcm,pwm-channels' value, will use %u\n",
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+ numchans);
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}
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err = bcm2835_devm_add_vchi_ctx(dev);
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if (err)
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return err;
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- err = snd_add_child_devices(dev, num_channels);
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+ err = snd_add_child_devices(dev, numchans);
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if (err)
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return err;
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@@ -330,6 +337,12 @@ static int snd_bcm2835_alsa_resume(struc
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#endif
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+static const struct of_device_id snd_bcm2835_of_match_table[] = {
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+ { .compatible = "brcm,bcm2835-audio",},
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, snd_bcm2835_of_match_table);
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+
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static struct platform_driver bcm2835_alsa_driver = {
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.probe = snd_bcm2835_alsa_probe,
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#ifdef CONFIG_PM
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@@ -338,6 +351,7 @@ static struct platform_driver bcm2835_al
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#endif
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.driver = {
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.name = "bcm2835_audio",
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+ .of_match_table = snd_bcm2835_of_match_table,
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},
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};
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module_platform_driver(bcm2835_alsa_driver);
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@@ -345,4 +359,3 @@ module_platform_driver(bcm2835_alsa_driv
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MODULE_AUTHOR("Dom Cobley");
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MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");
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MODULE_LICENSE("GPL");
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-MODULE_ALIAS("platform:bcm2835_audio");
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