linux-kernel - [PATCH v5 10/17] soundwire: register master device driver

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Date:   Tue, 17 Dec 2019 15:03:07 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, tiwai@...e.de, broonie@...nel.org,
        vkoul@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: [PATCH v5 10/17] soundwire: register master device driver

From: Bard Liao <yung-chuan.liao@...ux.intel.com>

While we don't have a matching function, setting an device driver is
still necessary for ASoC to register DAI components as well as power
management.

Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
---
 drivers/soundwire/intel.c      |  6 ++++++
 drivers/soundwire/intel_init.c | 10 ++++++++++
 drivers/soundwire/master.c     |  1 +
 include/linux/soundwire/sdw.h  |  1 +
 4 files changed, 18 insertions(+)

diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 36dbcbab0d65..29ebdb07e622 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -17,6 +17,7 @@
 #include <linux/soundwire/sdw_registers.h>
 #include <linux/soundwire/sdw.h>
 #include <linux/soundwire/sdw_intel.h>
+#include <linux/soundwire/sdw_type.h>
 #include "cadence_master.h"
 #include "bus.h"
 #include "intel.h"
@@ -1058,6 +1059,11 @@ static int intel_master_remove(struct sdw_master_device *md)
 }
 
 struct sdw_md_driver intel_sdw_driver = {
+	.driver = {
+		.name = "intel-sdw",
+		.owner = THIS_MODULE,
+		.bus = &sdw_bus_type,
+	},
 	.probe = intel_master_probe,
 	.startup = intel_master_startup,
 	.remove = intel_master_remove,
diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c
index 42f7ae034bea..a30d95ee71b7 100644
--- a/drivers/soundwire/intel_init.c
+++ b/drivers/soundwire/intel_init.c
@@ -146,6 +146,7 @@ static struct sdw_intel_ctx
 	struct sdw_master_device *md;
 	u32 link_mask;
 	int count;
+	int err;
 	int i;
 
 	if (!res)
@@ -176,6 +177,12 @@ static struct sdw_intel_ctx
 	link = ctx->links;
 	link_mask = ctx->link_mask;
 
+	err = driver_register(&intel_sdw_driver.driver);
+	if (err) {
+		dev_err(&adev->dev, "failed to register sdw master driver\n");
+		goto register_err;
+	}
+
 	/* Create SDW Master devices */
 	for (i = 0; i < count; i++, link++) {
 		if (link_mask && !(link_mask & BIT(i)))
@@ -209,6 +216,8 @@ static struct sdw_intel_ctx
 err:
 	sdw_intel_cleanup(ctx);
 link_err:
+	driver_unregister(&intel_sdw_driver.driver);
+register_err:
 	kfree(ctx);
 	return NULL;
 }
@@ -350,6 +359,7 @@ EXPORT_SYMBOL(sdw_intel_startup);
 void sdw_intel_exit(struct sdw_intel_ctx *ctx)
 {
 	sdw_intel_cleanup(ctx);
+	driver_unregister(&intel_sdw_driver.driver);
 	kfree(ctx);
 }
 EXPORT_SYMBOL(sdw_intel_exit);
diff --git a/drivers/soundwire/master.c b/drivers/soundwire/master.c
index b018c561708e..1c6bb293468c 100644
--- a/drivers/soundwire/master.c
+++ b/drivers/soundwire/master.c
@@ -46,6 +46,7 @@ struct sdw_master_device *sdw_md_add(struct sdw_md_driver *driver,
 	md->dev.type = &sdw_md_type;
 	md->dev.dma_mask = md->dev.parent->dma_mask;
 	dev_set_name(&md->dev, "sdw-master-%d", md->link_id);
+	md->dev.driver = &driver->driver;
 
 	ret = device_register(&md->dev);
 	if (ret) {
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index f73c355de5e5..58f50257dfa8 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -630,6 +630,7 @@ struct sdw_md_driver {
 	int (*remove)(struct sdw_master_device *md);
 	int (*autonomous_clock_stop_enable)(struct sdw_master_device *md,
 					    bool state);
+	struct device_driver driver;
 };
 
 #define SDW_SLAVE_ENTRY(_mfg_id, _part_id, _drv_data) \
-- 
2.20.1