linux-kernel - [PATCH v9 3/4] tee: add tee_device_set_dev

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Message-Id: <20240814153558.708365-4-jens.wiklander@linaro.org>
Date: Wed, 14 Aug 2024 17:35:57 +0200
From: Jens Wiklander <jens.wiklander@...aro.org>
To: linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org,
	op-tee@...ts.trustedfirmware.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc: Shyam Saini <shyamsaini@...ux.microsoft.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jerome Forissier <jerome.forissier@...aro.org>,
	Sumit Garg <sumit.garg@...aro.org>,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	Bart Van Assche <bvanassche@....org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Manuel Traut <manut@...ka.net>,
	Mikko Rapeli <mikko.rapeli@...aro.org>,
	Jens Wiklander <jens.wiklander@...aro.org>
Subject: [PATCH v9 3/4] tee: add tee_device_set_dev_groups()

Add tee_device_set_dev_groups() to TEE drivers to supply driver specific
attribute groups. The class specific attributes are from now on added
via the tee_class, which currently only consist of implementation_id.

Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
---
 drivers/tee/tee_core.c   | 19 +++++++++++++------
 include/linux/tee_core.h | 12 ++++++++++++
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index d52e879b204e..d113679b1e2d 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -40,10 +40,7 @@ static const uuid_t tee_client_uuid_ns = UUID_INIT(0x58ac9ca0, 0x2086, 0x4683,
 static DECLARE_BITMAP(dev_mask, TEE_NUM_DEVICES);
 static DEFINE_SPINLOCK(driver_lock);
 
-static const struct class tee_class = {
-	.name = "tee",
-};
-
+static const struct class tee_class;
 static dev_t tee_devt;
 
 struct tee_context *teedev_open(struct tee_device *teedev)
@@ -965,6 +962,13 @@ struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
 }
 EXPORT_SYMBOL_GPL(tee_device_alloc);
 
+void tee_device_set_dev_groups(struct tee_device *teedev,
+			       const struct attribute_group **dev_groups)
+{
+	teedev->dev.groups = dev_groups;
+}
+EXPORT_SYMBOL_GPL(tee_device_set_dev_groups);
+
 static ssize_t implementation_id_show(struct device *dev,
 				      struct device_attribute *attr, char *buf)
 {
@@ -983,6 +987,11 @@ static struct attribute *tee_dev_attrs[] = {
 
 ATTRIBUTE_GROUPS(tee_dev);
 
+static const struct class tee_class = {
+	.name = "tee",
+	.dev_groups = tee_dev_groups,
+};
+
 /**
  * tee_device_register() - Registers a TEE device
  * @teedev:	Device to register
@@ -1001,8 +1010,6 @@ int tee_device_register(struct tee_device *teedev)
 		return -EINVAL;
 	}
 
-	teedev->dev.groups = tee_dev_groups;
-
 	rc = cdev_device_add(&teedev->cdev, &teedev->dev);
 	if (rc) {
 		dev_err(&teedev->dev,
diff --git a/include/linux/tee_core.h b/include/linux/tee_core.h
index efd16ed52315..a38494d6b5f4 100644
--- a/include/linux/tee_core.h
+++ b/include/linux/tee_core.h
@@ -154,6 +154,18 @@ int tee_device_register(struct tee_device *teedev);
  */
 void tee_device_unregister(struct tee_device *teedev);
 
+/**
+ * tee_device_set_dev_groups() - Set device attribute groups
+ * @teedev:	Device to register
+ * @dev_groups: Attribute groups
+ *
+ * Assigns the provided @dev_groups to the @teedev to be registered later
+ * with tee_device_register(). Calling this function is optional, but if
+ * it's called it must be called before tee_device_register().
+ */
+void tee_device_set_dev_groups(struct tee_device *teedev,
+			       const struct attribute_group **dev_groups);
+
 /**
  * tee_session_calc_client_uuid() - Calculates client UUID for session
  * @uuid:		Resulting UUID
-- 
2.34.1