linux-kernel - [PATCH v11 4/5] staging: bcm2835-audio: Register bcm2835-audio with vchiq_bus

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Message-Id: <20230913195354.835884-5-umang.jain@ideasonboard.com>
Date:   Thu, 14 Sep 2023 01:23:53 +0530
From:   Umang Jain <umang.jain@...asonboard.com>
To:     linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Adrien Thierry <athierry@...hat.com>,
        Dan Carpenter <error27@...il.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Umang Jain <umang.jain@...asonboard.com>
Subject: [PATCH v11 4/5] staging: bcm2835-audio: Register bcm2835-audio with vchiq_bus_type

Similar to how bcm2385-camera device is registered, register the
bcm2835-audio with vchiq_bus_type as well.

Since we moved away bcm2835-audio from platform driver/device,
we have to set the DMA mask explicitly. Set the DMA mask at probe
time.

Meanwhile at it, change the name and module alias from "bcm2835_audio"
to "bcm2835-audio" to be consistent with bcm2835-camera device. This
does not brings any functional change as '-' and '_' are
interchangeable as per modprobe man pages.

Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
---
 .../vc04_services/bcm2835-audio/bcm2835.c     | 29 ++++++++++++-------
 .../interface/vchiq_arm/vchiq_arm.c           |  6 ++--
 2 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
index 00bc898b0189..7d945703d97f 100644
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -1,12 +1,13 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright 2011 Broadcom Corporation.  All rights reserved. */
 
-#include <linux/platform_device.h>
-
+#include <linux/dma-mapping.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 
+#include "../interface/vchiq_arm/vchiq_arm.h"
+#include "../interface/vchiq_arm/vchiq_device.h"
 #include "bcm2835.h"
 
 static bool enable_hdmi;
@@ -268,11 +269,19 @@ static int snd_add_child_devices(struct device *device, u32 numchans)
 	return 0;
 }
 
-static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
+static int snd_bcm2835_alsa_probe(struct vchiq_device *device)
 {
-	struct device *dev = &pdev->dev;
+	struct device *dev = &device->dev;
 	int err;
 
+	if (!dev->dma_mask)
+		dev->dma_mask = &dev->coherent_dma_mask;
+	err = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+	if (err) {
+		dev_err(dev, "can't set coherent DMA mask: %d\n", err);
+		return err;
+	}
+
 	if (num_channels <= 0 || num_channels > MAX_SUBSTREAMS) {
 		num_channels = MAX_SUBSTREAMS;
 		dev_warn(dev, "Illegal num_channels value, will use %u\n",
@@ -292,32 +301,32 @@ static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
 
 #ifdef CONFIG_PM
 
-static int snd_bcm2835_alsa_suspend(struct platform_device *pdev,
+static int snd_bcm2835_alsa_suspend(struct vchiq_device *device,
 				    pm_message_t state)
 {
 	return 0;
 }
 
-static int snd_bcm2835_alsa_resume(struct platform_device *pdev)
+static int snd_bcm2835_alsa_resume(struct vchiq_device *device)
 {
 	return 0;
 }
 
 #endif
 
-static struct platform_driver bcm2835_alsa_driver = {
+static struct vchiq_driver bcm2835_alsa_driver = {
 	.probe = snd_bcm2835_alsa_probe,
 #ifdef CONFIG_PM
 	.suspend = snd_bcm2835_alsa_suspend,
 	.resume = snd_bcm2835_alsa_resume,
 #endif
 	.driver = {
-		.name = "bcm2835_audio",
+		.name = "bcm2835-audio",
 	},
 };
-module_platform_driver(bcm2835_alsa_driver);
+module_vchiq_driver(bcm2835_alsa_driver);
 
 MODULE_AUTHOR("Dom Cobley");
 MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:bcm2835_audio");
+MODULE_ALIAS("bcm2835-audio");
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index 14bdde610f3a..2da470740cda 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -67,12 +67,12 @@ int vchiq_susp_log_level = VCHIQ_LOG_ERROR;
 DEFINE_SPINLOCK(msg_queue_spinlock);
 struct vchiq_state g_state;
 
-static struct platform_device *bcm2835_audio;
 /*
  * The devices implemented in the VCHIQ firmware are not discoverable,
  * so we need to maintain a list of them in order to register them with
  * the interface.
  */
+static struct vchiq_device *bcm2835_audio;
 static struct vchiq_device *bcm2835_camera;
 
 struct vchiq_drvdata {
@@ -1845,7 +1845,7 @@ static int vchiq_probe(struct platform_device *pdev)
 		goto error_exit;
 	}
 
-	bcm2835_audio = vchiq_register_child(pdev, "bcm2835_audio");
+	bcm2835_audio = vchiq_device_register(&pdev->dev, "bcm2835-audio");
 	bcm2835_camera = vchiq_device_register(&pdev->dev, "bcm2835-camera");
 
 	return 0;
@@ -1858,7 +1858,7 @@ static int vchiq_probe(struct platform_device *pdev)
 
 static void vchiq_remove(struct platform_device *pdev)
 {
-	platform_device_unregister(bcm2835_audio);
+	vchiq_device_unregister(bcm2835_audio);
 	vchiq_device_unregister(bcm2835_camera);
 	vchiq_debugfs_deinit();
 	vchiq_deregister_chrdev();
-- 
2.40.1