drivers/video/backlight/adp8860_bl.c: fix ambient light zone overwrite handling

This affects the get/set of the current Ambient Light Zone.  Reading
should return an integer between 1..3 (1 = Daylight, 2 = office, 3 =
dark).  Writing a value between 1..3 forces the backlight controller to
enter the corresponding Ambient Light Zone.  Writing 0 returns to normal
operation.

Fix valid range checking so we don't write invalid values to the
controller, and make sure we subtract 1, since this is what the register
definition (CFGR:BLV) requires.  Otherwise the values written don't work
correctly.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/video/backlight/adp8860_bl.c b/drivers/video/backlight/adp8860_bl.c
index 3ec24609151e8ec322c48afcebae8dc9ce578b5d..a447c92acc51aa12bcd2587a5b5ef90ba13f045b 100644 (file)
--- a/drivers/video/backlight/adp8860_bl.c
+++ b/drivers/video/backlight/adp8860_bl.c
@@ -614,7 +614,7 @@ static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,
        if (val == 0) {
                /* Enable automatic ambient light sensing */
                adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
-       } else if ((val > 0) && (val < 6)) {
+       } else if ((val > 0) && (val <= 3)) {
                /* Disable automatic ambient light sensing */
                adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
 
@@ -622,7 +622,7 @@ static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,
                mutex_lock(&data->lock);
                adp8860_read(data->client, ADP8860_CFGR, &reg_val);
                reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
-               reg_val |= val << CFGR_BLV_SHIFT;
+               reg_val |= (val - 1) << CFGR_BLV_SHIFT;
                adp8860_write(data->client, ADP8860_CFGR, reg_val);
                mutex_unlock(&data->lock);
        }