diff options
| author | Mario Schwalbe | 2009-01-11 00:19:31 +0000 |
|---|---|---|
| committer | Richard Purdie | 2009-04-06 16:06:55 +0100 |
| commit | 1a468ba10c3bdbc25ef7aa7fecda20ee27007bdf (patch) | |
| tree | e7836bd9643e4cc32bc76e2f4286ece19ea05f1e /drivers/video | |
| parent | c78a628849675580c7c5e1f07193c632e4b6827f (diff) | |
backlight: mbp_nvidia_bl - Add a debug switch
This patch adds a debug switch to enable (little) diagnostic
output, to help to trace down the remaining problems.
Signed-off-by: Mario Schwalbe <schwalbe@inf.tu-dresden.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/backlight/mbp_nvidia_bl.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/video/backlight/mbp_nvidia_bl.c b/drivers/video/backlight/mbp_nvidia_bl.c index ce09b83244ac..3bb4c0a50c62 100644 --- a/drivers/video/backlight/mbp_nvidia_bl.c +++ b/drivers/video/backlight/mbp_nvidia_bl.c @@ -36,6 +36,11 @@ struct dmi_match_data { struct backlight_ops backlight_ops; }; +/* Module parameters. */ +static int debug; +module_param_named(debug, debug, int, 0644); +MODULE_PARM_DESC(debug, "Set to one to enable debugging messages."); + /* * Implementation for MacBooks with Intel chipset. */ @@ -43,6 +48,10 @@ static int intel_chipset_send_intensity(struct backlight_device *bd) { int intensity = bd->props.brightness; + if (debug) + printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n", + intensity); + outb(0x04 | (intensity << 4), 0xb3); outb(0xbf, 0xb2); return 0; @@ -50,9 +59,17 @@ static int intel_chipset_send_intensity(struct backlight_device *bd) static int intel_chipset_get_intensity(struct backlight_device *bd) { + int intensity; + outb(0x03, 0xb3); outb(0xbf, 0xb2); - return inb(0xb3) >> 4; + intensity = inb(0xb3) >> 4; + + if (debug) + printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n", + intensity); + + return intensity; } static const struct dmi_match_data intel_chipset_data = { @@ -72,6 +89,10 @@ static int nvidia_chipset_send_intensity(struct backlight_device *bd) { int intensity = bd->props.brightness; + if (debug) + printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n", + intensity); + outb(0x04 | (intensity << 4), 0x52f); outb(0xbf, 0x52e); return 0; @@ -79,9 +100,17 @@ static int nvidia_chipset_send_intensity(struct backlight_device *bd) static int nvidia_chipset_get_intensity(struct backlight_device *bd) { + int intensity; + outb(0x03, 0x52f); outb(0xbf, 0x52e); - return inb(0x52f) >> 4; + intensity = inb(0x52f) >> 4; + + if (debug) + printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n", + intensity); + + return intensity; } static const struct dmi_match_data nvidia_chipset_data = { |