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leds-bcm6328: support second hw blinking interval 

Right now the driver uses only 3 LED modes:
0: On
1: HW Blinking (Interval 1)
3: Off

However, the controller supports a second HW blinking interval, which results
in 4 possible LED modes:
0: On
1: HW Blinking (Interval 1)
2: HW Blinking (Interval 2)
3: Off

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Álvaro Fernández Rojas 2020-06-04 15:59:05 +02:00 committed by Pavel Machek
parent b5684a73d2
commit e190f57df3
1 changed files with 75 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
drivers/leds/leds-bcm6328.c
View File

@ -24,12 +24,17 @@
#define BCM6328_LED_MAX_COUNT 24
#define BCM6328_LED_DEF_DELAY 500
#define BCM6328_LED_INTERVAL_MS 20
#define BCM6328_LED_INTV_MASK 0x3f
#define BCM6328_LED_FAST_INTV_SHIFT 6
#define BCM6328_LED_FAST_INTV_MASK (BCM6328_LED_INTV_MASK << \
BCM6328_LED_FAST_INTV_SHIFT)
#define BCM6328_LED_BLINK_DELAYS 2
#define BCM6328_LED_BLINK_MS 20
#define BCM6328_LED_BLINK_MASK 0x3f
#define BCM6328_LED_BLINK1_SHIFT 0
#define BCM6328_LED_BLINK1_MASK (BCM6328_LED_BLINK_MASK << \
BCM6328_LED_BLINK1_SHIFT)
#define BCM6328_LED_BLINK2_SHIFT 6
#define BCM6328_LED_BLINK2_MASK (BCM6328_LED_BLINK_MASK << \
BCM6328_LED_BLINK2_SHIFT)
#define BCM6328_SERIAL_LED_EN BIT(12)
#define BCM6328_SERIAL_LED_MUX BIT(13)
#define BCM6328_SERIAL_LED_CLK_NPOL BIT(14)
@ -45,8 +50,8 @@
#define BCM6328_LED_MODE_MASK 3
#define BCM6328_LED_MODE_ON 0
#define BCM6328_LED_MODE_FAST 1
#define BCM6328_LED_MODE_BLINK 2
#define BCM6328_LED_MODE_BLINK1 1
#define BCM6328_LED_MODE_BLINK2 2
#define BCM6328_LED_MODE_OFF 3
#define BCM6328_LED_SHIFT(X) ((X) << 1)
@ -127,12 +132,18 @@ static void bcm6328_led_set(struct led_classdev *led_cdev,
unsigned long flags;
spin_lock_irqsave(led->lock, flags);
*(led->blink_leds) &= ~BIT(led->pin);
/* Remove LED from cached HW blinking intervals */
led->blink_leds[0] &= ~BIT(led->pin);
led->blink_leds[1] &= ~BIT(led->pin);
/* Set LED on/off */
if ((led->active_low && value == LED_OFF) ||
(!led->active_low && value != LED_OFF))
bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
else
bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
spin_unlock_irqrestore(led->lock, flags);
}
@ -140,8 +151,8 @@ 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;
bcm6328_delay = delay + BCM6328_LED_BLINK_MS / 2;
bcm6328_delay = bcm6328_delay / BCM6328_LED_BLINK_MS;
if (bcm6328_delay == 0)
bcm6328_delay = 1;
@ -168,28 +179,68 @@ static int bcm6328_blink_set(struct led_classdev *led_cdev,
return -EINVAL;
}
if (delay > BCM6328_LED_INTV_MASK) {
if (delay > BCM6328_LED_BLINK_MASK) {
dev_dbg(led_cdev->dev,
"fallback to soft blinking (delay > %ums)\n",
BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS);
BCM6328_LED_BLINK_MASK * BCM6328_LED_BLINK_MS);
return -EINVAL;
}
spin_lock_irqsave(led->lock, flags);
if (*(led->blink_leds) == 0 ||
*(led->blink_leds) == BIT(led->pin) ||
*(led->blink_delay) == delay) {
/*
* Check if any of the two configurable HW blinking intervals is
* available:
* 1. No LEDs assigned to the HW blinking interval.
* 2. Only this LED is assigned to the HW blinking interval.
* 3. LEDs with the same delay assigned.
*/
if (led->blink_leds[0] == 0 ||
led->blink_leds[0] == BIT(led->pin) ||
led->blink_delay[0] == delay) {
unsigned long val;
*(led->blink_leds) |= BIT(led->pin);
*(led->blink_delay) = delay;
/* Add LED to the first HW blinking interval cache */
led->blink_leds[0] |= BIT(led->pin);
/* Remove LED from the second HW blinking interval cache */
led->blink_leds[1] &= ~BIT(led->pin);
/* Cache first HW blinking interval delay */
led->blink_delay[0] = delay;
/* Update the delay for the first HW blinking interval */
val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
val &= ~BCM6328_LED_FAST_INTV_MASK;
val |= (delay << BCM6328_LED_FAST_INTV_SHIFT);
val &= ~BCM6328_LED_BLINK1_MASK;
val |= (delay << BCM6328_LED_BLINK1_SHIFT);
bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK);
/* Set the LED to first HW blinking interval */
bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK1);
rc = 0;
} else if (led->blink_leds[1] == 0 ||
led->blink_leds[1] == BIT(led->pin) ||
led->blink_delay[1] == delay) {
unsigned long val;
/* Remove LED from the first HW blinking interval */
led->blink_leds[0] &= ~BIT(led->pin);
/* Add LED to the second HW blinking interval */
led->blink_leds[1] |= BIT(led->pin);
/* Cache second HW blinking interval delay */
led->blink_delay[1] = delay;
/* Update the delay for the second HW blinking interval */
val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
val &= ~BCM6328_LED_BLINK2_MASK;
val |= (delay << BCM6328_LED_BLINK2_SHIFT);
bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
/* Set the LED to second HW blinking interval */
bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK2);
rc = 0;
} else {
dev_dbg(led_cdev->dev,
@ -358,11 +409,13 @@ static int bcm6328_leds_probe(struct platform_device *pdev)
if (!lock)
return -ENOMEM;
blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL);
blink_leds = devm_kcalloc(dev, BCM6328_LED_BLINK_DELAYS,
sizeof(*blink_leds), GFP_KERNEL);
if (!blink_leds)
return -ENOMEM;
blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL);
blink_delay = devm_kcalloc(dev, BCM6328_LED_BLINK_DELAYS,
sizeof(*blink_delay), GFP_KERNEL);
if (!blink_delay)
return -ENOMEM;