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leds: bcm6328: improve blink support 

BCM6328 controller has a margin of 20ms per blink step, which means that
we can only set it to 20, 40, 60 ... 1260 ms (0x3f * 20ms).
However, when checking if delay_on == delay_off, we were not considering
the case when the user had set delay_on=20 and delay_off=21, since this
will cause the driver to fallback to software blinking.
This update fixes this issue and improves blink steps by rounding them
in a more sensible way. Now 30-49ms is rounded to 40 ms, and previous
behaviour implied 40-59ms being rounded to 40 ms.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
hifive-unleashed-5.1
Álvaro Fernández Rojas 2015-12-16 21:13:48 +01:00 committed by Jacek Anaszewski
parent 6e636a0a28
commit 1b85a5a5ef
1 changed files with 15 additions and 5 deletions
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20
drivers/leds/leds-bcm6328.c
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@ -140,6 +140,18 @@ static void bcm6328_led_set(struct led_classdev *led_cdev,
spin_unlock_irqrestore(led->lock, flags);
}
static unsigned long bcm6328_blink_delay(unsigned long delay)
{
unsigned long bcm6328_delay;
bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2;
bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS;
if (bcm6328_delay == 0)
bcm6328_delay = 1;
return bcm6328_delay;
}
static int bcm6328_blink_set(struct led_classdev *led_cdev,
unsigned long *delay_on, unsigned long *delay_off)
{
@ -153,16 +165,14 @@ static int bcm6328_blink_set(struct led_classdev *led_cdev,
if (!*delay_off)
*delay_off = BCM6328_LED_DEF_DELAY;
if (*delay_on != *delay_off) {
delay = bcm6328_blink_delay(*delay_on);
if (delay != bcm6328_blink_delay(*delay_off)) {
dev_dbg(led_cdev->dev,
"fallback to soft blinking (delay_on != delay_off)\n");
return -EINVAL;
}
delay = *delay_on / BCM6328_LED_INTERVAL_MS;
if (delay == 0) {
delay = 1;
} else if (delay > BCM6328_LED_INTV_MASK) {
if (delay > BCM6328_LED_INTV_MASK) {
dev_dbg(led_cdev->dev,
"fallback to soft blinking (delay > %ums)\n",
BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS);