[net-next PATCH v3 05/14] net: phy: phy_device: Call into the PHY driver to set LED brightness.

Christian Marangi
2023-03-14T16:18:31Z

From: Andrew Lunn <andrew@lunn.ch>

Linux LEDs can be software controlled via the brightness file in /sys.
LED drivers need to implement a brightness_set function which the core
will call. Implement an intermediary in phy_device, which will call
into the phy driver if it implements the necessary function.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
drivers/net/phy/phy_device.c | 14 +++++++++++---
include/linux/phy.h | 9 +++++++++
2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 8acade42615c..e4df4fcb6b05 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2967,11 +2967,18 @@ static bool phy_drv_supports_irq(struct phy_driver *phydrv)
return phydrv->config_intr && phydrv->handle_interrupt;
}

-/* Dummy implementation until calls into PHY driver are added */
static int phy_led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness value)
{
- return 0;
+ struct phy_led *phyled = to_phy_led(led_cdev);
+ struct phy_device *phydev = phyled->phydev;
+ int err;
+
+ mutex_lock(&phydev->lock);
+ err = phydev->drv->led_brightness_set(phydev, phyled->index, value);
+ mutex_unlock(&phydev->lock);
+
+ return err;
}

static int of_phy_led(struct phy_device *phydev,
@@ -2995,7 +3002,8 @@ static int of_phy_led(struct phy_device *phydev,
if (err)
return err;

- cdev->brightness_set_blocking = phy_led_set_brightness;
+ if (phydev->drv->led_brightness_set)
+ cdev->brightness_set_blocking = phy_led_set_brightness;
cdev->max_brightness = 1;
init_data.devicename = dev_name(&phydev->mdio.dev);
init_data.fwnode = of_fwnode_handle(led);
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 1b1efe120f0f..83d3ed7485e0 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -841,6 +841,8 @@ struct phy_led {
u32 index;
};

+#define to_phy_led(d) container_of(d, struct phy_led, led_cdev)
+
/**
* struct phy_driver - Driver structure for a particular PHY type
*
@@ -1063,6 +1065,13 @@ struct phy_driver {
/** @get_plca_status: Return the current PLCA status info */
int (*get_plca_status)(struct phy_device *dev,
struct phy_plca_status *plca_st);
+
+ /* Set a PHY LED brightness. Index indicates which of the PHYs
+ * led should be set. Value follows the standard LED class meaning,
+ * e.g. LED_OFF, LED_HALF, LED_FULL.
+ */
+ int (*led_brightness_set)(struct phy_device *dev,
+ u32 index, enum led_brightness value);
};
#define to_phy_driver(d) container_of(to_mdio_common_driver(d), \
struct phy_driver, mdiodrv)
--
2.39.2