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authorLinus Torvalds <torvalds@linux-foundation.org>2009-07-28 17:31:02 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-07-28 17:31:02 -0400
commitddb1d4ede9c8acd2e20ac99bf2b68146ae9f3553 (patch)
treecb28782aa447fe84b4f6a3c51e9b4d65766bb1d9 /drivers
parent655c5d8fc110a9d4f90cc831bd009936f3e8df28 (diff)
parent96f699ad09c8b3c55cd229506a9add0047838e3e (diff)
Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: i2c/tsl2550: Fix lux value in dark environment
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/chips/tsl2550.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/i2c/chips/tsl2550.c b/drivers/i2c/chips/tsl2550.c
index 1a9cc135219f..b96f3025e588 100644
--- a/drivers/i2c/chips/tsl2550.c
+++ b/drivers/i2c/chips/tsl2550.c
@@ -27,7 +27,7 @@
27#include <linux/delay.h> 27#include <linux/delay.h>
28 28
29#define TSL2550_DRV_NAME "tsl2550" 29#define TSL2550_DRV_NAME "tsl2550"
30#define DRIVER_VERSION "1.1.1" 30#define DRIVER_VERSION "1.1.2"
31 31
32/* 32/*
33 * Defines 33 * Defines
@@ -189,13 +189,16 @@ static int tsl2550_calculate_lux(u8 ch0, u8 ch1)
189 u8 r = 128; 189 u8 r = 128;
190 190
191 /* Avoid division by 0 and count 1 cannot be greater than count 0 */ 191 /* Avoid division by 0 and count 1 cannot be greater than count 0 */
192 if (c0 && (c1 <= c0)) 192 if (c1 <= c0)
193 r = c1 * 128 / c0; 193 if (c0) {
194 r = c1 * 128 / c0;
195
196 /* Calculate LUX */
197 lux = ((c0 - c1) * ratio_lut[r]) / 256;
198 } else
199 lux = 0;
194 else 200 else
195 return -1; 201 return -EAGAIN;
196
197 /* Calculate LUX */
198 lux = ((c0 - c1) * ratio_lut[r]) / 256;
199 202
200 /* LUX range check */ 203 /* LUX range check */
201 return lux > TSL2550_MAX_LUX ? TSL2550_MAX_LUX : lux; 204 return lux > TSL2550_MAX_LUX ? TSL2550_MAX_LUX : lux;