From fcbb3c356eae05812fcefc8eda8f49034dbbb8ed Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Tue, 19 Oct 2021 16:45:16 +0200
Subject: [PATCH] auxdisplay: ht16k33: Extract frame buffer probing

Extract all frame buffer (including backlight) probing into
ht16k33_fbdev_probe().

Call ht16k33_fbdev_probe() after ht16k33_keypad_probe(), as the latter
does not need any manual cleanup in the probe error path.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Robin van der Gracht <robin@protonic.nl>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 drivers/auxdisplay/ht16k33.c | 101 ++++++++++++++++++-----------------
 1 file changed, 53 insertions(+), 48 deletions(-)

diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index 60e616c0e932..8993d2790910 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -404,33 +404,13 @@ static int ht16k33_keypad_probe(struct i2c_client *client,
 	return input_register_device(keypad->dev);
 }
 
-static int ht16k33_probe(struct i2c_client *client)
+static int ht16k33_fbdev_probe(struct device *dev, struct ht16k33_priv *priv,
+			       uint32_t brightness)
 {
-	int err;
-	uint32_t dft_brightness;
-	struct backlight_device *bl;
+	struct ht16k33_fbdev *fbdev = &priv->fbdev;
 	struct backlight_properties bl_props;
-	struct ht16k33_priv *priv;
-	struct ht16k33_fbdev *fbdev;
-	struct device *dev = &client->dev;
-	struct device_node *node = dev->of_node;
-
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
-		dev_err(dev, "i2c_check_functionality error\n");
-		return -EIO;
-	}
-
-	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	priv->client = client;
-	i2c_set_clientdata(client, priv);
-	fbdev = &priv->fbdev;
-
-	err = ht16k33_initialize(priv);
-	if (err)
-		return err;
+	struct backlight_device *bl;
+	int err;
 
 	/* Backlight */
 	memset(&bl_props, 0, sizeof(struct backlight_properties));
@@ -444,18 +424,7 @@ static int ht16k33_probe(struct i2c_client *client)
 		return PTR_ERR(bl);
 	}
 
-	err = of_property_read_u32(node, "default-brightness-level",
-				   &dft_brightness);
-	if (err) {
-		dft_brightness = MAX_BRIGHTNESS;
-	} else if (dft_brightness > MAX_BRIGHTNESS) {
-		dev_warn(dev,
-			 "invalid default brightness level: %u, using %u\n",
-			 dft_brightness, MAX_BRIGHTNESS);
-		dft_brightness = MAX_BRIGHTNESS;
-	}
-
-	bl->props.brightness = dft_brightness;
+	bl->props.brightness = brightness;
 	ht16k33_bl_update_status(bl);
 
 	/* Framebuffer (2 bytes per column) */
@@ -476,8 +445,8 @@ static int ht16k33_probe(struct i2c_client *client)
 		goto err_fbdev_buffer;
 	}
 
-	err = of_property_read_u32(node, "refresh-rate-hz",
-		&fbdev->refresh_rate);
+	err = of_property_read_u32(dev->of_node, "refresh-rate-hz",
+				   &fbdev->refresh_rate);
 	if (err) {
 		dev_err(dev, "refresh rate not specified\n");
 		goto err_fbdev_info;
@@ -499,18 +468,9 @@ static int ht16k33_probe(struct i2c_client *client)
 	if (err)
 		goto err_fbdev_info;
 
-	/* Keypad */
-	if (client->irq > 0) {
-		err = ht16k33_keypad_probe(client, &priv->keypad);
-		if (err)
-			goto err_fbdev_unregister;
-	}
-
 	ht16k33_fb_queue(priv);
 	return 0;
 
-err_fbdev_unregister:
-	unregister_framebuffer(fbdev->info);
 err_fbdev_info:
 	framebuffer_release(fbdev->info);
 err_fbdev_buffer:
@@ -519,6 +479,51 @@ err_fbdev_buffer:
 	return err;
 }
 
+static int ht16k33_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct ht16k33_priv *priv;
+	uint32_t dft_brightness;
+	int err;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(dev, "i2c_check_functionality error\n");
+		return -EIO;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->client = client;
+	i2c_set_clientdata(client, priv);
+
+	err = ht16k33_initialize(priv);
+	if (err)
+		return err;
+
+	err = of_property_read_u32(dev->of_node, "default-brightness-level",
+				   &dft_brightness);
+	if (err) {
+		dft_brightness = MAX_BRIGHTNESS;
+	} else if (dft_brightness > MAX_BRIGHTNESS) {
+		dev_warn(dev,
+			 "invalid default brightness level: %u, using %u\n",
+			 dft_brightness, MAX_BRIGHTNESS);
+		dft_brightness = MAX_BRIGHTNESS;
+	}
+
+	/* Keypad */
+	if (client->irq > 0) {
+		err = ht16k33_keypad_probe(client, &priv->keypad);
+		if (err)
+			return err;
+	}
+
+	/* Frame Buffer Display */
+	return ht16k33_fbdev_probe(dev, priv, dft_brightness);
+}
+
 static int ht16k33_remove(struct i2c_client *client)
 {
 	struct ht16k33_priv *priv = i2c_get_clientdata(client);