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From 6259d03df45a2fd245f6799a83a491edad07c80d Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Fri, 15 Mar 2019 21:11:10 +0000
Subject: [PATCH] Revert "staging: bcm2835-audio: Drop DT dependency"
This reverts commit b7491a9fca2dc2535b9dc922550a37c5baae9d3d.
---
.../vc04_services/bcm2835-audio/bcm2835.c | 31 +++++++++++++------
1 file changed, 22 insertions(+), 9 deletions(-)
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -6,13 +6,13 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/of.h>
#include "bcm2835.h"
static bool enable_hdmi;
static bool enable_headphones;
static bool enable_compat_alsa = true;
-static int num_channels = MAX_SUBSTREAMS;
module_param(enable_hdmi, bool, 0444);
MODULE_PARM_DESC(enable_hdmi, "Enables HDMI virtual audio device");
@@ -21,8 +21,6 @@ MODULE_PARM_DESC(enable_headphones, "Ena
module_param(enable_compat_alsa, bool, 0444);
MODULE_PARM_DESC(enable_compat_alsa,
"Enables ALSA compatibility virtual audio device");
-module_param(num_channels, int, 0644);
-MODULE_PARM_DESC(num_channels, "Number of audio channels (default: 8)");
static void bcm2835_devm_free_vchi_ctx(struct device *dev, void *res)
{
@@ -296,19 +294,28 @@ static int snd_add_child_devices(struct
static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ u32 numchans;
int err;
- if (num_channels <= 0 || num_channels > MAX_SUBSTREAMS) {
- num_channels = MAX_SUBSTREAMS;
- dev_warn(dev, "Illegal num_channels value, will use %u\n",
- num_channels);
+ err = of_property_read_u32(dev->of_node, "brcm,pwm-channels",
+ &numchans);
+ if (err) {
+ dev_err(dev, "Failed to get DT property 'brcm,pwm-channels'");
+ return err;
+ }
+
+ if (numchans == 0 || numchans > MAX_SUBSTREAMS) {
+ numchans = MAX_SUBSTREAMS;
+ dev_warn(dev,
+ "Illegal 'brcm,pwm-channels' value, will use %u\n",
+ numchans);
}
err = bcm2835_devm_add_vchi_ctx(dev);
if (err)
return err;
- err = snd_add_child_devices(dev, num_channels);
+ err = snd_add_child_devices(dev, numchans);
if (err)
return err;
@@ -330,6 +337,12 @@ static int snd_bcm2835_alsa_resume(struc
#endif
+static const struct of_device_id snd_bcm2835_of_match_table[] = {
+ { .compatible = "brcm,bcm2835-audio",},
+ {},
+};
+MODULE_DEVICE_TABLE(of, snd_bcm2835_of_match_table);
+
static struct platform_driver bcm2835_alsa_driver = {
.probe = snd_bcm2835_alsa_probe,
#ifdef CONFIG_PM
@@ -338,6 +351,7 @@ static struct platform_driver bcm2835_al
#endif
.driver = {
.name = "bcm2835_audio",
+ .of_match_table = snd_bcm2835_of_match_table,
},
};
module_platform_driver(bcm2835_alsa_driver);
@@ -345,4 +359,3 @@ module_platform_driver(bcm2835_alsa_driv
MODULE_AUTHOR("Dom Cobley");
MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:bcm2835_audio");
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