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authorMilo Kim <milo.kim@ti.com>2013-08-08 06:45:45 +0200
committerBryan Wu <cooloney@gmail.com>2013-08-27 02:22:12 +0200
commit1eca0b3ab8d04e2b1749b28cbcafbba6f6e74225 (patch)
tree9b5bbac0f71bb731e5014f30159d8b98ec6a2968 /drivers/leds
parentleds: lp5521: restore legacy device attributes (diff)
downloadlinux-1eca0b3ab8d04e2b1749b28cbcafbba6f6e74225.tar.xz
linux-1eca0b3ab8d04e2b1749b28cbcafbba6f6e74225.zip
leds: lp5521: remove unnecessary writing commands
This patch reduces the number of programming commands. (Count of sending commands) Old code: 32 + program size (32 counts for clearing program memory) New code: 32 Pattern buffer is initialized to 0 in this function. Just update new program data and remaining buffers are filled with 0. So it's needless to clear whole area. Signed-off-by: Milo Kim <milo.kim@ti.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-lp5521.c14
1 files changed, 3 insertions, 11 deletions
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index c00f922163b3..05188351711d 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -220,17 +220,11 @@ static int lp5521_update_program_memory(struct lp55xx_chip *chip,
};
unsigned cmd;
char c[3];
- int program_size;
int nrchars;
- int offset = 0;
int ret;
- int i;
-
- /* clear program memory before updating */
- for (i = 0; i < LP5521_PROGRAM_LENGTH; i++)
- lp55xx_write(chip, addr[idx] + i, 0);
+ int offset = 0;
+ int i = 0;
- i = 0;
while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
/* separate sscanfs because length is working only for %s */
ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
@@ -250,11 +244,9 @@ static int lp5521_update_program_memory(struct lp55xx_chip *chip,
if (i % 2)
goto err;
- program_size = i;
-
mutex_lock(&chip->lock);
- for (i = 0; i < program_size; i++) {
+ for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
if (ret) {
mutex_unlock(&chip->lock);