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487 lines
13 KiB
487 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c |
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* |
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* Copyright 2015 Álvaro Fernández Rojas <[email protected]> |
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* Copyright 2015 Jonas Gorski <[email protected]> |
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*/ |
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#include <linux/io.h> |
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#include <linux/leds.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/spinlock.h> |
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#define BCM6328_REG_INIT 0x00 |
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#define BCM6328_REG_MODE_HI 0x04 |
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#define BCM6328_REG_MODE_LO 0x08 |
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#define BCM6328_REG_HWDIS 0x0c |
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#define BCM6328_REG_STROBE 0x10 |
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#define BCM6328_REG_LNKACTSEL_HI 0x14 |
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#define BCM6328_REG_LNKACTSEL_LO 0x18 |
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#define BCM6328_REG_RBACK 0x1c |
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#define BCM6328_REG_SERMUX 0x20 |
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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_BLINK_DELAYS 2 |
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#define BCM6328_LED_BLINK_MS 20 |
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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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#define BCM6328_SERIAL_LED_DATA_PPOL BIT(15) |
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#define BCM6328_SERIAL_LED_SHIFT_DIR BIT(16) |
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#define BCM6328_LED_SHIFT_TEST BIT(30) |
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#define BCM6328_LED_TEST BIT(31) |
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#define BCM6328_INIT_MASK (BCM6328_SERIAL_LED_EN | \ |
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BCM6328_SERIAL_LED_MUX | \ |
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BCM6328_SERIAL_LED_CLK_NPOL | \ |
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BCM6328_SERIAL_LED_DATA_PPOL | \ |
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BCM6328_SERIAL_LED_SHIFT_DIR) |
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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_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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/** |
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* struct bcm6328_led - state container for bcm6328 based LEDs |
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* @cdev: LED class device for this LED |
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* @mem: memory resource |
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* @lock: memory lock |
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* @pin: LED pin number |
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* @blink_leds: blinking LEDs |
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* @blink_delay: blinking delay |
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* @active_low: LED is active low |
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*/ |
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struct bcm6328_led { |
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struct led_classdev cdev; |
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void __iomem *mem; |
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spinlock_t *lock; |
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unsigned long pin; |
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unsigned long *blink_leds; |
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unsigned long *blink_delay; |
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bool active_low; |
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}; |
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static void bcm6328_led_write(void __iomem *reg, unsigned long data) |
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{ |
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#ifdef CONFIG_CPU_BIG_ENDIAN |
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iowrite32be(data, reg); |
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#else |
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writel(data, reg); |
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#endif |
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} |
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static unsigned long bcm6328_led_read(void __iomem *reg) |
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{ |
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#ifdef CONFIG_CPU_BIG_ENDIAN |
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return ioread32be(reg); |
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#else |
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return readl(reg); |
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#endif |
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} |
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/** |
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* LEDMode 64 bits / 24 LEDs |
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* bits [31:0] -> LEDs 8-23 |
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* bits [47:32] -> LEDs 0-7 |
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* bits [63:48] -> unused |
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*/ |
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static unsigned long bcm6328_pin2shift(unsigned long pin) |
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{ |
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if (pin < 8) |
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return pin + 16; /* LEDs 0-7 (bits 47:32) */ |
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else |
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return pin - 8; /* LEDs 8-23 (bits 31:0) */ |
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} |
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static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value) |
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{ |
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void __iomem *mode; |
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unsigned long val, shift; |
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shift = bcm6328_pin2shift(led->pin); |
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if (shift / 16) |
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mode = led->mem + BCM6328_REG_MODE_HI; |
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else |
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mode = led->mem + BCM6328_REG_MODE_LO; |
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val = bcm6328_led_read(mode); |
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val &= ~(BCM6328_LED_MODE_MASK << BCM6328_LED_SHIFT(shift % 16)); |
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val |= (value << BCM6328_LED_SHIFT(shift % 16)); |
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bcm6328_led_write(mode, val); |
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} |
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static void bcm6328_led_set(struct led_classdev *led_cdev, |
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enum led_brightness value) |
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{ |
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struct bcm6328_led *led = |
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container_of(led_cdev, struct bcm6328_led, cdev); |
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unsigned long flags; |
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spin_lock_irqsave(led->lock, flags); |
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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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/* 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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spin_unlock_irqrestore(led->lock, flags); |
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} |
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static unsigned long bcm6328_blink_delay(unsigned long delay) |
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{ |
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unsigned long bcm6328_delay; |
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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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return bcm6328_delay; |
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} |
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static int bcm6328_blink_set(struct led_classdev *led_cdev, |
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unsigned long *delay_on, unsigned long *delay_off) |
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{ |
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struct bcm6328_led *led = |
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container_of(led_cdev, struct bcm6328_led, cdev); |
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unsigned long delay, flags; |
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int rc; |
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if (!*delay_on) |
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*delay_on = BCM6328_LED_DEF_DELAY; |
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if (!*delay_off) |
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*delay_off = BCM6328_LED_DEF_DELAY; |
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delay = bcm6328_blink_delay(*delay_on); |
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if (delay != bcm6328_blink_delay(*delay_off)) { |
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dev_dbg(led_cdev->dev, |
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"fallback to soft blinking (delay_on != delay_off)\n"); |
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return -EINVAL; |
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} |
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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_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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/* |
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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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/* Add LED to the first HW blinking interval cache */ |
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led->blink_leds[0] |= BIT(led->pin); |
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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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/* 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_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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/* Set the LED to first HW blinking interval */ |
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bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK1); |
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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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/* Remove LED from the first HW blinking interval */ |
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led->blink_leds[0] &= ~BIT(led->pin); |
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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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/* Cache second HW blinking interval delay */ |
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led->blink_delay[1] = delay; |
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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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/* Set the LED to second HW blinking interval */ |
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bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK2); |
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rc = 0; |
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} else { |
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dev_dbg(led_cdev->dev, |
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"fallback to soft blinking (delay already set)\n"); |
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rc = -EINVAL; |
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} |
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spin_unlock_irqrestore(led->lock, flags); |
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return rc; |
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} |
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static int bcm6328_hwled(struct device *dev, struct device_node *nc, u32 reg, |
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void __iomem *mem, spinlock_t *lock) |
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{ |
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int i, cnt; |
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unsigned long flags, val; |
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spin_lock_irqsave(lock, flags); |
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val = bcm6328_led_read(mem + BCM6328_REG_HWDIS); |
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val &= ~BIT(reg); |
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bcm6328_led_write(mem + BCM6328_REG_HWDIS, val); |
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spin_unlock_irqrestore(lock, flags); |
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/* Only LEDs 0-7 can be activity/link controlled */ |
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if (reg >= 8) |
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return 0; |
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cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources", |
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sizeof(u32)); |
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for (i = 0; i < cnt; i++) { |
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u32 sel; |
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void __iomem *addr; |
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if (reg < 4) |
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addr = mem + BCM6328_REG_LNKACTSEL_LO; |
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else |
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addr = mem + BCM6328_REG_LNKACTSEL_HI; |
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of_property_read_u32_index(nc, "brcm,link-signal-sources", i, |
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&sel); |
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if (reg / 4 != sel / 4) { |
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dev_warn(dev, "invalid link signal source\n"); |
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continue; |
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} |
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spin_lock_irqsave(lock, flags); |
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val = bcm6328_led_read(addr); |
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val |= (BIT(reg % 4) << (((sel % 4) * 4) + 16)); |
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bcm6328_led_write(addr, val); |
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spin_unlock_irqrestore(lock, flags); |
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} |
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cnt = of_property_count_elems_of_size(nc, |
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"brcm,activity-signal-sources", |
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sizeof(u32)); |
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for (i = 0; i < cnt; i++) { |
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u32 sel; |
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void __iomem *addr; |
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if (reg < 4) |
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addr = mem + BCM6328_REG_LNKACTSEL_LO; |
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else |
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addr = mem + BCM6328_REG_LNKACTSEL_HI; |
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of_property_read_u32_index(nc, "brcm,activity-signal-sources", |
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i, &sel); |
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if (reg / 4 != sel / 4) { |
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dev_warn(dev, "invalid activity signal source\n"); |
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continue; |
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} |
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spin_lock_irqsave(lock, flags); |
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val = bcm6328_led_read(addr); |
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val |= (BIT(reg % 4) << ((sel % 4) * 4)); |
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bcm6328_led_write(addr, val); |
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spin_unlock_irqrestore(lock, flags); |
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} |
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return 0; |
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} |
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static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg, |
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void __iomem *mem, spinlock_t *lock, |
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unsigned long *blink_leds, unsigned long *blink_delay) |
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{ |
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struct led_init_data init_data = {}; |
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struct bcm6328_led *led; |
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const char *state; |
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int rc; |
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led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); |
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if (!led) |
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return -ENOMEM; |
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led->pin = reg; |
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led->mem = mem; |
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led->lock = lock; |
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led->blink_leds = blink_leds; |
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led->blink_delay = blink_delay; |
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if (of_property_read_bool(nc, "active-low")) |
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led->active_low = true; |
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if (!of_property_read_string(nc, "default-state", &state)) { |
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if (!strcmp(state, "on")) { |
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led->cdev.brightness = LED_FULL; |
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} else if (!strcmp(state, "keep")) { |
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void __iomem *mode; |
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unsigned long val, shift; |
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shift = bcm6328_pin2shift(led->pin); |
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if (shift / 16) |
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mode = mem + BCM6328_REG_MODE_HI; |
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else |
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mode = mem + BCM6328_REG_MODE_LO; |
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val = bcm6328_led_read(mode) >> |
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BCM6328_LED_SHIFT(shift % 16); |
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val &= BCM6328_LED_MODE_MASK; |
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if ((led->active_low && val == BCM6328_LED_MODE_OFF) || |
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(!led->active_low && val == BCM6328_LED_MODE_ON)) |
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led->cdev.brightness = LED_FULL; |
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else |
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led->cdev.brightness = LED_OFF; |
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} else { |
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led->cdev.brightness = LED_OFF; |
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} |
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} else { |
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led->cdev.brightness = LED_OFF; |
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} |
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bcm6328_led_set(&led->cdev, led->cdev.brightness); |
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led->cdev.brightness_set = bcm6328_led_set; |
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led->cdev.blink_set = bcm6328_blink_set; |
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init_data.fwnode = of_fwnode_handle(nc); |
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rc = devm_led_classdev_register_ext(dev, &led->cdev, &init_data); |
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if (rc < 0) |
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return rc; |
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dev_dbg(dev, "registered LED %s\n", led->cdev.name); |
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return 0; |
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} |
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static int bcm6328_leds_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev_of_node(&pdev->dev); |
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struct device_node *child; |
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void __iomem *mem; |
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spinlock_t *lock; /* memory lock */ |
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unsigned long val, *blink_leds, *blink_delay; |
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mem = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(mem)) |
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return PTR_ERR(mem); |
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lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL); |
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if (!lock) |
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return -ENOMEM; |
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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_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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spin_lock_init(lock); |
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bcm6328_led_write(mem + BCM6328_REG_HWDIS, ~0); |
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bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_HI, 0); |
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bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_LO, 0); |
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val = bcm6328_led_read(mem + BCM6328_REG_INIT); |
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val &= ~(BCM6328_INIT_MASK); |
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if (of_property_read_bool(np, "brcm,serial-leds")) |
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val |= BCM6328_SERIAL_LED_EN; |
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if (of_property_read_bool(np, "brcm,serial-mux")) |
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val |= BCM6328_SERIAL_LED_MUX; |
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if (of_property_read_bool(np, "brcm,serial-clk-low")) |
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val |= BCM6328_SERIAL_LED_CLK_NPOL; |
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if (!of_property_read_bool(np, "brcm,serial-dat-low")) |
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val |= BCM6328_SERIAL_LED_DATA_PPOL; |
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if (!of_property_read_bool(np, "brcm,serial-shift-inv")) |
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val |= BCM6328_SERIAL_LED_SHIFT_DIR; |
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bcm6328_led_write(mem + BCM6328_REG_INIT, val); |
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for_each_available_child_of_node(np, child) { |
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int rc; |
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u32 reg; |
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if (of_property_read_u32(child, "reg", ®)) |
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continue; |
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if (reg >= BCM6328_LED_MAX_COUNT) { |
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dev_err(dev, "invalid LED (%u >= %d)\n", reg, |
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BCM6328_LED_MAX_COUNT); |
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continue; |
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} |
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if (of_property_read_bool(child, "brcm,hardware-controlled")) |
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rc = bcm6328_hwled(dev, child, reg, mem, lock); |
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else |
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rc = bcm6328_led(dev, child, reg, mem, lock, |
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blink_leds, blink_delay); |
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if (rc < 0) { |
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of_node_put(child); |
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return rc; |
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} |
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} |
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return 0; |
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} |
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static const struct of_device_id bcm6328_leds_of_match[] = { |
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{ .compatible = "brcm,bcm6328-leds", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, bcm6328_leds_of_match); |
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static struct platform_driver bcm6328_leds_driver = { |
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.probe = bcm6328_leds_probe, |
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.driver = { |
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.name = "leds-bcm6328", |
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.of_match_table = bcm6328_leds_of_match, |
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}, |
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}; |
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module_platform_driver(bcm6328_leds_driver); |
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MODULE_AUTHOR("Álvaro Fernández Rojas <[email protected]>"); |
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MODULE_AUTHOR("Jonas Gorski <[email protected]>"); |
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MODULE_DESCRIPTION("LED driver for BCM6328 controllers"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:leds-bcm6328");
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