diff options
| author | Milo Kim <milo.kim@ti.com> | 2013-08-08 13:45:45 +0900 |
|---|---|---|
| committer | Bryan Wu <cooloney@gmail.com> | 2013-08-26 17:22:12 -0700 |
| commit | 1eca0b3ab8d04e2b1749b28cbcafbba6f6e74225 (patch) | |
| tree | 9b5bbac0f71bb731e5014f30159d8b98ec6a2968 /drivers/leds | |
| parent | c0e5e9b542d134eb43ea4ebc83446e6f2f63089a (diff) | |
| download | linux-1eca0b3ab8d04e2b1749b28cbcafbba6f6e74225.tar.bz2 | |
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.c | 14 |
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); |