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authorLars-Peter Clausen <lars@metafoo.de>2010-05-12 02:44:32 +0200
committerRichard Purdie <rpurdie@linux.intel.com>2010-05-26 17:34:38 +0100
commit2ddfd12f3584840f5190897214423061d8a0602f (patch)
tree91addeb7e06bd84c69e8ba0ec0044d9cd7270fcc /include/linux/mfd
parent1f976996c7413b5b48d35b195cc2d7adcd3f68d7 (diff)
downloadblackbird-op-linux-2ddfd12f3584840f5190897214423061d8a0602f.tar.gz
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backlight: Add pcf50633 backlight driver
This patch adds a backlight driver for controlling the pcf50633 LED module. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
Diffstat (limited to 'include/linux/mfd')
-rw-r--r--include/linux/mfd/pcf50633/backlight.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/include/linux/mfd/pcf50633/backlight.h b/include/linux/mfd/pcf50633/backlight.h
new file mode 100644
index 000000000000..83747e217b27
--- /dev/null
+++ b/include/linux/mfd/pcf50633/backlight.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
+ * PCF50633 backlight device driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef __LINUX_MFD_PCF50633_BACKLIGHT
+#define __LINUX_MFD_PCF50633_BACKLIGHT
+
+/*
+* @default_brightness: Backlight brightness is initialized to this value
+*
+* Brightness to be used after the driver has been probed.
+* Valid range 0-63.
+*
+* @default_brightness_limit: The actual brightness is limited by this value
+*
+* Brightness limit to be used after the driver has been probed. This is useful
+* when it is not known how much power is available for the backlight during
+* probe.
+* Valid range 0-63. Can be changed later with pcf50633_bl_set_brightness_limit.
+*
+* @ramp_time: Display ramp time when changing brightness
+*
+* When changing the backlights brightness the change is not instant, instead
+* it fades smooth from one state to another. This value specifies how long
+* the fade should take. The lower the value the higher the fade time.
+* Valid range 0-255
+*/
+struct pcf50633_bl_platform_data {
+ unsigned int default_brightness;
+ unsigned int default_brightness_limit;
+ uint8_t ramp_time;
+};
+
+
+struct pcf50633;
+
+int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit);
+
+#endif
+
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