[PATCH v5 4/5] HID: mcp2221: switch i2c registration to devm functions

[Matt Ranostay <matt.ranostay@konsulko.com>]

Switch from i2c_add_adapter() to resource managed devm_i2c_add_adapter()
for matching rest of driver initialization, and more concise code.

Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
---
 drivers/hid/hid-mcp2221.c | 51 ++++++++++++++++++++-------------------
 1 file changed, 26 insertions(+), 25 deletions(-)

diff --git a/drivers/hid/hid-mcp2221.c b/drivers/hid/hid-mcp2221.c
index de52e9f7bb8c..3365e21547c6 100644
--- a/drivers/hid/hid-mcp2221.c
+++ b/drivers/hid/hid-mcp2221.c
@@ -824,6 +824,21 @@ static int mcp2221_raw_event(struct hid_device *hdev,
 	return 1;
 }
 
+/* Device resource managed function for HID unregistration */
+static void mcp2221_hid_unregister(void *ptr)
+{
+	struct hid_device *hdev = ptr;
+
+	hid_hw_close(hdev);
+	hid_hw_stop(hdev);
+}
+
+/* This is needed to be sure hid_hw_stop() isn't called twice by the subsystem */
+static void mcp2221_remove(struct hid_device *hdev)
+{
+	return;
+}
+
 static int mcp2221_probe(struct hid_device *hdev,
 					const struct hid_device_id *id)
 {
@@ -849,7 +864,8 @@ static int mcp2221_probe(struct hid_device *hdev,
 	ret = hid_hw_open(hdev);
 	if (ret) {
 		hid_err(hdev, "can't open device\n");
-		goto err_hstop;
+		hid_hw_stop(hdev);
+		return ret;
 	}
 
 	mutex_init(&mcp->lock);
@@ -857,6 +873,10 @@ static int mcp2221_probe(struct hid_device *hdev,
 	hid_set_drvdata(hdev, mcp);
 	mcp->hdev = hdev;
 
+	ret = devm_add_action_or_reset(&hdev->dev, mcp2221_hid_unregister, hdev);
+	if (ret)
+		return ret;
+
 	/* Set I2C bus clock diviser */
 	if (i2c_clk_freq > 400)
 		i2c_clk_freq = 400;
@@ -873,19 +893,17 @@ static int mcp2221_probe(struct hid_device *hdev,
 			"MCP2221 usb-i2c bridge on hidraw%d",
 			((struct hidraw *)hdev->hidraw)->minor);
 
-	ret = i2c_add_adapter(&mcp->adapter);
+	ret = devm_i2c_add_adapter(&hdev->dev, &mcp->adapter);
 	if (ret) {
 		hid_err(hdev, "can't add usb-i2c adapter: %d\n", ret);
-		goto err_i2c;
+		return ret;
 	}
 	i2c_set_adapdata(&mcp->adapter, mcp);
 
 	/* Setup GPIO chip */
 	mcp->gc = devm_kzalloc(&hdev->dev, sizeof(*mcp->gc), GFP_KERNEL);
-	if (!mcp->gc) {
-		ret = -ENOMEM;
-		goto err_gc;
-	}
+	if (!mcp->gc)
+		return -ENOMEM;
 
 	mcp->gc->label = "mcp2221_gpio";
 	mcp->gc->direction_input = mcp_gpio_direction_input;
@@ -900,26 +918,9 @@ static int mcp2221_probe(struct hid_device *hdev,
 
 	ret = devm_gpiochip_add_data(&hdev->dev, mcp->gc, mcp);
 	if (ret)
-		goto err_gc;
+		return ret;
 
 	return 0;
-
-err_gc:
-	i2c_del_adapter(&mcp->adapter);
-err_i2c:
-	hid_hw_close(mcp->hdev);
-err_hstop:
-	hid_hw_stop(mcp->hdev);
-	return ret;
-}
-
-static void mcp2221_remove(struct hid_device *hdev)
-{
-	struct mcp2221 *mcp = hid_get_drvdata(hdev);
-
-	i2c_del_adapter(&mcp->adapter);
-	hid_hw_close(mcp->hdev);
-	hid_hw_stop(mcp->hdev);
 }
 
 static const struct hid_device_id mcp2221_devices[] = {
-- 
2.37.2