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

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Date:   Tue, 14 Mar 2023 11:15:07 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Christian Marangi <ansuelsmth@...il.com>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, Lee Jones <lee@...nel.org>,
        linux-leds@...r.kernel.org
Subject: [net-next PATCH v3 05/14] net: phy: phy_device: Call into the PHY driver to set LED brightness.

From: Andrew Lunn <andrew@...n.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@...n.ch>
Signed-off-by: Christian Marangi <ansuelsmth@...il.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