BACKLIGHT: Add more information output to pwm_backlight

[Ben Dooks <ben-linux@fluff.org>]

[-- Attachment #1: simtec/simtec-drivers-backlight-pwm-updates.patch --]
[-- Type: text/plain, Size: 1776 bytes --]

Make the error paths in the pwm_backlight driver more
informative in the probe path, especially for the times
that it finds an error.

CC: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

Index: linux-2.6.26-quilt4/drivers/video/backlight/pwm_bl.c
===================================================================
--- linux-2.6.26-quilt4.orig/drivers/video/backlight/pwm_bl.c	2008-07-29 11:28:01.000000000 +0100
+++ linux-2.6.26-quilt4/drivers/video/backlight/pwm_bl.c	2008-07-29 11:36:02.000000000 +0100
@@ -68,8 +68,10 @@ static int pwm_backlight_probe(struct pl
 	struct pwm_bl_data *pb;
 	int ret;
 
-	if (!data)
+	if (!data) {
+		dev_err(&pdev->dev, "failed to find platform data\n");
 		return -EINVAL;
+	}
 
 	if (data->init) {
 		ret = data->init(&pdev->dev);
@@ -79,6 +81,7 @@ static int pwm_backlight_probe(struct pl
 
 	pb = kzalloc(sizeof(*pb), GFP_KERNEL);
 	if (!pb) {
+		dev_err(&pdev->dev, "no memory for state\n");
 		ret = -ENOMEM;
 		goto err_alloc;
 	}
@@ -91,7 +94,8 @@ static int pwm_backlight_probe(struct pl
 		dev_err(&pdev->dev, "unable to request PWM for backlight\n");
 		ret = PTR_ERR(pb->pwm);
 		goto err_pwm;
-	}
+	} else
+		dev_dbg(&pdev->dev, "got pwm for backlight\n");
 
 	bl = backlight_device_register(pdev->name, &pdev->dev,
 			pb, &pwm_backlight_ops);

-- 
Ben (ben@fluff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'

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