linux-kernel - [PATCH v2 1/2] soc: qcom: rmtfs-mem: Add class to enable uevents

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Message-Id: <20181221201001.160613-2-evgreen@chromium.org>
Date:   Fri, 21 Dec 2018 12:10:00 -0800
From:   Evan Green <evgreen@...omium.org>
To:     Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Brian Norris <briannorris@...omium.org>,
        Ben Chan <benchan@...omium.org>,
        Evan Green <evgreen@...omium.org>,
        linux-arm-msm@...r.kernel.org,
        David Brown <david.brown@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] soc: qcom: rmtfs-mem: Add class to enable uevents

Currently the qcom_rmtfs_memN devices are entirely invisible to the udev world.
Add a class to the rmtfs device so that uevents fire when the device is added.

Signed-off-by: Evan Green <evgreen@...omium.org>
---

Changes in v2:
- Moved class registration/deregistration into init/exit routines (Brian)

 drivers/soc/qcom/rmtfs_mem.c | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c
index 97bb5989aa211..99a1363ece254 100644
--- a/drivers/soc/qcom/rmtfs_mem.c
+++ b/drivers/soc/qcom/rmtfs_mem.c
@@ -132,6 +132,11 @@ static int qcom_rmtfs_mem_release(struct inode *inode, struct file *filp)
 	return 0;
 }
 
+static struct class rmtfs_class = {
+	.owner          = THIS_MODULE,
+	.name           = "rmtfs",
+};
+
 static const struct file_operations qcom_rmtfs_mem_fops = {
 	.owner = THIS_MODULE,
 	.open = qcom_rmtfs_mem_open,
@@ -199,8 +204,8 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
 
 	dev_set_name(&rmtfs_mem->dev, "qcom_rmtfs_mem%d", client_id);
 	rmtfs_mem->dev.id = client_id;
+	rmtfs_mem->dev.class = &rmtfs_class;
 	rmtfs_mem->dev.devt = MKDEV(MAJOR(qcom_rmtfs_mem_major), client_id);
-
 	ret = cdev_device_add(&rmtfs_mem->cdev, &rmtfs_mem->dev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add cdev: %d\n", ret);
@@ -239,7 +244,6 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
 	cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
 put_device:
 	put_device(&rmtfs_mem->dev);
-
 	return ret;
 }
 
@@ -258,7 +262,6 @@ static int qcom_rmtfs_mem_remove(struct platform_device *pdev)
 
 	cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
 	put_device(&rmtfs_mem->dev);
-
 	return 0;
 }
 
@@ -277,32 +280,42 @@ static struct platform_driver qcom_rmtfs_mem_driver = {
 	},
 };
 
-static int qcom_rmtfs_mem_init(void)
+static int __init qcom_rmtfs_mem_init(void)
 {
 	int ret;
 
+	ret = class_register(&rmtfs_class);
+	if (ret)
+		return ret;
+
 	ret = alloc_chrdev_region(&qcom_rmtfs_mem_major, 0,
 				  QCOM_RMTFS_MEM_DEV_MAX, "qcom_rmtfs_mem");
 	if (ret < 0) {
 		pr_err("qcom_rmtfs_mem: failed to allocate char dev region\n");
-		return ret;
+		goto unregister_class;
 	}
 
 	ret = platform_driver_register(&qcom_rmtfs_mem_driver);
 	if (ret < 0) {
 		pr_err("qcom_rmtfs_mem: failed to register rmtfs_mem driver\n");
-		unregister_chrdev_region(qcom_rmtfs_mem_major,
-					 QCOM_RMTFS_MEM_DEV_MAX);
+		goto unregister_chrdev;
 	}
 
+	return 0;
+
+unregister_chrdev:
+	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
+unregister_class:
+	class_unregister(&rmtfs_class);
 	return ret;
 }
 module_init(qcom_rmtfs_mem_init);
 
-static void qcom_rmtfs_mem_exit(void)
+static void __exit qcom_rmtfs_mem_exit(void)
 {
 	platform_driver_unregister(&qcom_rmtfs_mem_driver);
 	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
+	class_unregister(&rmtfs_class);
 }
 module_exit(qcom_rmtfs_mem_exit);
 
-- 
2.18.1