igc: Export LEDs

Each i225 has three LEDs. Export them via the LED class framework.

Each LED is controllable via sysfs. Example:

$ cd /sys/class/leds/igc_led0
$ cat brightness      # Current Mode
$ cat max_brightness  # 15
$ echo 0 > brightness # Mode 0
$ echo 1 > brightness # Mode 1

The brightness field here reflects the different LED modes ranging
from 0 to 15.

Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 132 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 11385c380947..100819dcc7dd 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -6130,6 +6130,134 @@ err_inval:
 	return -EINVAL;
 }
 
+static void igc_select_led(struct igc_adapter *adapter, int led,
+			   u32 *mask, u32 *shift)
+{
+	switch (led) {
+	case 0:
+		*mask  = IGC_LEDCTL_LED0_MODE_MASK;
+		*shift = IGC_LEDCTL_LED0_MODE_SHIFT;
+		break;
+	case 1:
+		*mask  = IGC_LEDCTL_LED1_MODE_MASK;
+		*shift = IGC_LEDCTL_LED1_MODE_SHIFT;
+		break;
+	case 2:
+		*mask  = IGC_LEDCTL_LED2_MODE_MASK;
+		*shift = IGC_LEDCTL_LED2_MODE_SHIFT;
+		break;
+	default:
+		*mask = *shift = 0;
+		dev_err(&adapter->pdev->dev, "Unknown led %d selected!", led);
+	}
+}
+
+static void igc_led_set(struct igc_adapter *adapter, int led, u16 brightness)
+{
+	struct igc_hw *hw = &adapter->hw;
+	u32 shift, mask, ledctl;
+
+	igc_select_led(adapter, led, &mask, &shift);
+
+	mutex_lock(&adapter->led_mutex);
+	ledctl = rd32(IGC_LEDCTL);
+	ledctl &= ~mask;
+	ledctl |= brightness << shift;
+	wr32(IGC_LEDCTL, ledctl);
+	mutex_unlock(&adapter->led_mutex);
+}
+
+static enum led_brightness igc_led_get(struct igc_adapter *adapter, int led)
+{
+	struct igc_hw *hw = &adapter->hw;
+	u32 shift, mask, ledctl;
+
+	igc_select_led(adapter, led, &mask, &shift);
+
+	mutex_lock(&adapter->led_mutex);
+	ledctl = rd32(IGC_LEDCTL);
+	mutex_unlock(&adapter->led_mutex);
+
+	return (ledctl & mask) >> shift;
+}
+
+static void igc_led0_set(struct led_classdev *ldev, enum led_brightness b)
+{
+	struct igc_adapter *adapter = led_to_igc(ldev, led0);
+
+	igc_led_set(adapter, 0, b);
+}
+
+static enum led_brightness igc_led0_get(struct led_classdev *ldev)
+{
+	struct igc_adapter *adapter = led_to_igc(ldev, led0);
+
+	return igc_led_get(adapter, 0);
+}
+
+static void igc_led1_set(struct led_classdev *ldev, enum led_brightness b)
+{
+	struct igc_adapter *adapter = led_to_igc(ldev, led1);
+
+	igc_led_set(adapter, 1, b);
+}
+
+static enum led_brightness igc_led1_get(struct led_classdev *ldev)
+{
+	struct igc_adapter *adapter = led_to_igc(ldev, led1);
+
+	return igc_led_get(adapter, 1);
+}
+
+static void igc_led2_set(struct led_classdev *ldev, enum led_brightness b)
+{
+	struct igc_adapter *adapter = led_to_igc(ldev, led2);
+
+	igc_led_set(adapter, 2, b);
+}
+
+static enum led_brightness igc_led2_get(struct led_classdev *ldev)
+{
+	struct igc_adapter *adapter = led_to_igc(ldev, led2);
+
+	return igc_led_get(adapter, 2);
+}
+
+static int igc_led_setup(struct igc_adapter *adapter)
+{
+	/* Setup */
+	mutex_init(&adapter->led_mutex);
+
+	adapter->led0.name	     = "igc_led0";
+	adapter->led0.max_brightness = 15;
+	adapter->led0.brightness_set = igc_led0_set;
+	adapter->led0.brightness_get = igc_led0_get;
+
+	adapter->led1.name	     = "igc_led1";
+	adapter->led1.max_brightness = 15;
+	adapter->led1.brightness_set = igc_led1_set;
+	adapter->led1.brightness_get = igc_led1_get;
+
+	adapter->led2.name	     = "igc_led2";
+	adapter->led2.max_brightness = 15;
+	adapter->led2.brightness_set = igc_led2_set;
+	adapter->led2.brightness_get = igc_led2_get;
+
+	/* Register leds */
+	led_classdev_register(&adapter->pdev->dev, &adapter->led0);
+	led_classdev_register(&adapter->pdev->dev, &adapter->led1);
+	led_classdev_register(&adapter->pdev->dev, &adapter->led2);
+
+	return 0;
+}
+
+static void igc_led_destroy(struct igc_adapter *adapter)
+{
+	led_classdev_unregister(&adapter->led0);
+	led_classdev_unregister(&adapter->led1);
+	led_classdev_unregister(&adapter->led2);
+}
+
 /**
  * igc_probe - Device Initialization Routine
  * @pdev: PCI device information struct
@@ -6357,6 +6485,8 @@ static int igc_probe(struct pci_dev *pdev,
 
 	pm_runtime_put_noidle(&pdev->dev);
 
+	igc_led_setup(adapter);
+
 	return 0;
 
 err_register:
@@ -6398,6 +6528,8 @@ static void igc_remove(struct pci_dev *pdev)
 
 	igc_ptp_stop(adapter);
 
+	igc_led_destroy(adapter);
+
 	set_bit(__IGC_DOWN, &adapter->state);
 
 	del_timer_sync(&adapter->watchdog_timer);