diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/misc/pca9551_led.c | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/drivers/misc/pca9551_led.c b/drivers/misc/pca9551_led.c index 79b1e20ccf..d4034f6735 100644 --- a/drivers/misc/pca9551_led.c +++ b/drivers/misc/pca9551_led.c @@ -32,7 +32,10 @@ struct pca9551_blink_rate { u8 pwm; /* Pulse width modulation, see PCA9551_7.pdf p. 6 */ }; -static int freq0, freq1; +static int freq_last = -1; +static int mask_last = -1; +static int idx_last = -1; +static int mode_last; static int pca9551_led_get_state(int led, int *state) { @@ -135,21 +138,30 @@ void __led_blink(led_id_t mask, int freq) { struct pca9551_blink_rate rate; int mode; - int blink; + int idx; - if ((freq0 == 0) || (freq == freq0)) { - blink = 0; - mode = PCA9551_LED_STATE_BLINK0; - freq0 = freq; + if ((freq == freq_last) || (mask == mask_last)) { + idx = idx_last; + mode = mode_last; } else { - blink = 1; - mode = PCA9551_LED_STATE_BLINK1; - freq1 = freq; + /* Toggle blink index */ + if (idx_last == 0) { + idx = 1; + mode = PCA9551_LED_STATE_BLINK1; + } else { + idx = 0; + mode = PCA9551_LED_STATE_BLINK0; + } + + idx_last = idx; + mode_last = mode; } + freq_last = freq; + mask_last = mask; rate.psc = ((freq * 38) / 1000) - 1; rate.pwm = 128; /* 50% duty cycle */ - pca9551_led_set_blink_rate(blink, rate); + pca9551_led_set_blink_rate(idx, rate); pca9551_led_set_state(mask, mode); } |