9fb1d4ce8a
The patch adding support for the second LED HW blinking interval has been merged (linux 5.9). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
189 lines
6.0 KiB
Diff
189 lines
6.0 KiB
Diff
From e190f57df3c7e7713687905c14e72fbcbd81c5e4 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
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Date: Thu, 4 Jun 2020 15:59:05 +0200
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Subject: [PATCH] leds-bcm6328: support second hw blinking interval
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Right now the driver uses only 3 LED modes:
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0: On
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1: HW Blinking (Interval 1)
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3: Off
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However, the controller supports a second HW blinking interval, which results
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in 4 possible LED modes:
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0: On
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1: HW Blinking (Interval 1)
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2: HW Blinking (Interval 2)
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3: Off
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Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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Signed-off-by: Pavel Machek <pavel@ucw.cz>
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---
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drivers/leds/leds-bcm6328.c | 97 ++++++++++++++++++++++++++++---------
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1 file changed, 75 insertions(+), 22 deletions(-)
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--- a/drivers/leds/leds-bcm6328.c
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+++ b/drivers/leds/leds-bcm6328.c
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@@ -24,12 +24,17 @@
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#define BCM6328_LED_MAX_COUNT 24
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#define BCM6328_LED_DEF_DELAY 500
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-#define BCM6328_LED_INTERVAL_MS 20
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-#define BCM6328_LED_INTV_MASK 0x3f
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-#define BCM6328_LED_FAST_INTV_SHIFT 6
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-#define BCM6328_LED_FAST_INTV_MASK (BCM6328_LED_INTV_MASK << \
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- BCM6328_LED_FAST_INTV_SHIFT)
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+#define BCM6328_LED_BLINK_DELAYS 2
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+#define BCM6328_LED_BLINK_MS 20
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+
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+#define BCM6328_LED_BLINK_MASK 0x3f
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+#define BCM6328_LED_BLINK1_SHIFT 0
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+#define BCM6328_LED_BLINK1_MASK (BCM6328_LED_BLINK_MASK << \
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+ BCM6328_LED_BLINK1_SHIFT)
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+#define BCM6328_LED_BLINK2_SHIFT 6
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+#define BCM6328_LED_BLINK2_MASK (BCM6328_LED_BLINK_MASK << \
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+ BCM6328_LED_BLINK2_SHIFT)
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#define BCM6328_SERIAL_LED_EN BIT(12)
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#define BCM6328_SERIAL_LED_MUX BIT(13)
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#define BCM6328_SERIAL_LED_CLK_NPOL BIT(14)
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@@ -45,8 +50,8 @@
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#define BCM6328_LED_MODE_MASK 3
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#define BCM6328_LED_MODE_ON 0
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-#define BCM6328_LED_MODE_FAST 1
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-#define BCM6328_LED_MODE_BLINK 2
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+#define BCM6328_LED_MODE_BLINK1 1
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+#define BCM6328_LED_MODE_BLINK2 2
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#define BCM6328_LED_MODE_OFF 3
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#define BCM6328_LED_SHIFT(X) ((X) << 1)
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@@ -127,12 +132,18 @@ static void bcm6328_led_set(struct led_c
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unsigned long flags;
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spin_lock_irqsave(led->lock, flags);
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- *(led->blink_leds) &= ~BIT(led->pin);
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+
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+ /* Remove LED from cached HW blinking intervals */
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+ led->blink_leds[0] &= ~BIT(led->pin);
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+ led->blink_leds[1] &= ~BIT(led->pin);
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+
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+ /* Set LED on/off */
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if ((led->active_low && value == LED_OFF) ||
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(!led->active_low && value != LED_OFF))
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bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
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else
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bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
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+
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spin_unlock_irqrestore(led->lock, flags);
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}
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@@ -140,8 +151,8 @@ static unsigned long bcm6328_blink_delay
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{
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unsigned long bcm6328_delay;
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- bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2;
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- bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS;
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+ bcm6328_delay = delay + BCM6328_LED_BLINK_MS / 2;
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+ bcm6328_delay = bcm6328_delay / BCM6328_LED_BLINK_MS;
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if (bcm6328_delay == 0)
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bcm6328_delay = 1;
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@@ -168,28 +179,68 @@ static int bcm6328_blink_set(struct led_
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return -EINVAL;
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}
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- if (delay > BCM6328_LED_INTV_MASK) {
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+ if (delay > BCM6328_LED_BLINK_MASK) {
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dev_dbg(led_cdev->dev,
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"fallback to soft blinking (delay > %ums)\n",
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- BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS);
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+ BCM6328_LED_BLINK_MASK * BCM6328_LED_BLINK_MS);
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return -EINVAL;
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}
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spin_lock_irqsave(led->lock, flags);
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- if (*(led->blink_leds) == 0 ||
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- *(led->blink_leds) == BIT(led->pin) ||
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- *(led->blink_delay) == delay) {
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+ /*
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+ * Check if any of the two configurable HW blinking intervals is
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+ * available:
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+ * 1. No LEDs assigned to the HW blinking interval.
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+ * 2. Only this LED is assigned to the HW blinking interval.
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+ * 3. LEDs with the same delay assigned.
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+ */
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+ if (led->blink_leds[0] == 0 ||
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+ led->blink_leds[0] == BIT(led->pin) ||
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+ led->blink_delay[0] == delay) {
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unsigned long val;
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- *(led->blink_leds) |= BIT(led->pin);
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- *(led->blink_delay) = delay;
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+ /* Add LED to the first HW blinking interval cache */
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+ led->blink_leds[0] |= BIT(led->pin);
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+
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+ /* Remove LED from the second HW blinking interval cache */
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+ led->blink_leds[1] &= ~BIT(led->pin);
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+ /* Cache first HW blinking interval delay */
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+ led->blink_delay[0] = delay;
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+
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+ /* Update the delay for the first HW blinking interval */
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val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
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- val &= ~BCM6328_LED_FAST_INTV_MASK;
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- val |= (delay << BCM6328_LED_FAST_INTV_SHIFT);
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+ val &= ~BCM6328_LED_BLINK1_MASK;
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+ val |= (delay << BCM6328_LED_BLINK1_SHIFT);
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bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
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- bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK);
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+ /* Set the LED to first HW blinking interval */
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+ bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK1);
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+
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+ rc = 0;
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+ } else if (led->blink_leds[1] == 0 ||
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+ led->blink_leds[1] == BIT(led->pin) ||
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+ led->blink_delay[1] == delay) {
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+ unsigned long val;
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+
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+ /* Remove LED from the first HW blinking interval */
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+ led->blink_leds[0] &= ~BIT(led->pin);
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+
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+ /* Add LED to the second HW blinking interval */
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+ led->blink_leds[1] |= BIT(led->pin);
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+
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+ /* Cache second HW blinking interval delay */
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+ led->blink_delay[1] = delay;
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+
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+ /* Update the delay for the second HW blinking interval */
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+ val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
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+ val &= ~BCM6328_LED_BLINK2_MASK;
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+ val |= (delay << BCM6328_LED_BLINK2_SHIFT);
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+ bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
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+
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+ /* Set the LED to second HW blinking interval */
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+ bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK2);
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+
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rc = 0;
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} else {
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dev_dbg(led_cdev->dev,
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@@ -363,11 +414,13 @@ static int bcm6328_leds_probe(struct pla
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if (!lock)
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return -ENOMEM;
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- blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL);
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+ blink_leds = devm_kcalloc(dev, BCM6328_LED_BLINK_DELAYS,
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+ sizeof(*blink_leds), GFP_KERNEL);
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if (!blink_leds)
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return -ENOMEM;
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- blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL);
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+ blink_delay = devm_kcalloc(dev, BCM6328_LED_BLINK_DELAYS,
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+ sizeof(*blink_delay), GFP_KERNEL);
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if (!blink_delay)
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return -ENOMEM;
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