net: phy: qca807x: add support for configurable LED

QCA8072/5 have up to 2 LEDs attached for PHY.

LEDs can be configured to be ON/hw blink or be set to HW control.

Hw blink mode is set to blink at 4Hz or 250ms.

PHY can support both copper (TP) or fiber (FIBRE) kind and supports
different HW control modes based on the port type.

HW control modes supported for netdev trigger for copper ports are:
- LINK_10
- LINK_100
- LINK_1000
- TX
- RX
- FULL_DUPLEX
- HALF_DUPLEX

HW control modes supported for netdev trigger for fiber ports are:
- LINK_100
- LINK_1000
- TX
- RX
- FULL_DUPLEX
- HALF_DUPLEX

LED support conflicts with GPIO controller feature and must be disabled
if gpio-controller is used for the PHY.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/qcom/qca807x.c

@@ -57,8 +57,18 @@
 #define QCA807X_MMD7_LED_CTRL(x)			(0x8074 + ((x) * 2))
 #define QCA807X_MMD7_LED_FORCE_CTRL(x)			(0x8075 + ((x) * 2))
 
-#define QCA807X_GPIO_FORCE_EN				BIT(15)
-#define QCA807X_GPIO_FORCE_MODE_MASK			GENMASK(14, 13)
+/* LED hw control pattern for fiber port */
+#define QCA807X_LED_FIBER_PATTERN_MASK			GENMASK(11, 1)
+#define QCA807X_LED_FIBER_TXACT_BLK_EN			BIT(10)
+#define QCA807X_LED_FIBER_RXACT_BLK_EN			BIT(9)
+#define QCA807X_LED_FIBER_FDX_ON_EN			BIT(6)
+#define QCA807X_LED_FIBER_HDX_ON_EN			BIT(5)
+#define QCA807X_LED_FIBER_1000BX_ON_EN			BIT(2)
+#define QCA807X_LED_FIBER_100FX_ON_EN			BIT(1)
+
+/* Some device repurpose the LED as GPIO out */
+#define QCA807X_GPIO_FORCE_EN				QCA808X_LED_FORCE_EN
+#define QCA807X_GPIO_FORCE_MODE_MASK			QCA808X_LED_FORCE_MODE_MASK
 
 #define QCA807X_FUNCTION_CONTROL			0x10
 #define QCA807X_FC_MDI_CROSSOVER_MODE_MASK		GENMASK(6, 5)
@@ -121,6 +131,233 @@ static int qca807x_cable_test_start(struct phy_device *phydev)
 	return 0;
 }
 
+static int qca807x_led_parse_netdev(struct phy_device *phydev, unsigned long rules,
+				    u16 *offload_trigger)
+{
+	/* Parsing specific to netdev trigger */
+	switch (phydev->port) {
+	case PORT_TP:
+		if (test_bit(TRIGGER_NETDEV_TX, &rules))
+			*offload_trigger |= QCA808X_LED_TX_BLINK;
+		if (test_bit(TRIGGER_NETDEV_RX, &rules))
+			*offload_trigger |= QCA808X_LED_RX_BLINK;
+		if (test_bit(TRIGGER_NETDEV_LINK_10, &rules))
+			*offload_trigger |= QCA808X_LED_SPEED10_ON;
+		if (test_bit(TRIGGER_NETDEV_LINK_100, &rules))
+			*offload_trigger |= QCA808X_LED_SPEED100_ON;
+		if (test_bit(TRIGGER_NETDEV_LINK_1000, &rules))
+			*offload_trigger |= QCA808X_LED_SPEED1000_ON;
+		if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &rules))
+			*offload_trigger |= QCA808X_LED_HALF_DUPLEX_ON;
+		if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &rules))
+			*offload_trigger |= QCA808X_LED_FULL_DUPLEX_ON;
+		break;
+	case PORT_FIBRE:
+		if (test_bit(TRIGGER_NETDEV_TX, &rules))
+			*offload_trigger |= QCA807X_LED_FIBER_TXACT_BLK_EN;
+		if (test_bit(TRIGGER_NETDEV_RX, &rules))
+			*offload_trigger |= QCA807X_LED_FIBER_RXACT_BLK_EN;
+		if (test_bit(TRIGGER_NETDEV_LINK_100, &rules))
+			*offload_trigger |= QCA807X_LED_FIBER_100FX_ON_EN;
+		if (test_bit(TRIGGER_NETDEV_LINK_1000, &rules))
+			*offload_trigger |= QCA807X_LED_FIBER_1000BX_ON_EN;
+		if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &rules))
+			*offload_trigger |= QCA807X_LED_FIBER_HDX_ON_EN;
+		if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &rules))
+			*offload_trigger |= QCA807X_LED_FIBER_FDX_ON_EN;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	if (rules && !*offload_trigger)
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+static int qca807x_led_hw_control_enable(struct phy_device *phydev, u8 index)
+{
+	u16 reg;
+
+	if (index > 1)
+		return -EINVAL;
+
+	reg = QCA807X_MMD7_LED_FORCE_CTRL(index);
+	return qca808x_led_reg_hw_control_enable(phydev, reg);
+}
+
+static int qca807x_led_hw_is_supported(struct phy_device *phydev, u8 index,
+				       unsigned long rules)
+{
+	u16 offload_trigger = 0;
+
+	if (index > 1)
+		return -EINVAL;
+
+	return qca807x_led_parse_netdev(phydev, rules, &offload_trigger);
+}
+
+static int qca807x_led_hw_control_set(struct phy_device *phydev, u8 index,
+				      unsigned long rules)
+{
+	u16 reg, mask, offload_trigger = 0;
+	int ret;
+
+	if (index > 1)
+		return -EINVAL;
+
+	ret = qca807x_led_parse_netdev(phydev, rules, &offload_trigger);
+	if (ret)
+		return ret;
+
+	ret = qca807x_led_hw_control_enable(phydev, index);
+	if (ret)
+		return ret;
+
+	switch (phydev->port) {
+	case PORT_TP:
+		reg = QCA807X_MMD7_LED_CTRL(index);
+		mask = QCA808X_LED_PATTERN_MASK;
+		break;
+	case PORT_FIBRE:
+		/* HW control pattern bits are in LED FORCE reg */
+		reg = QCA807X_MMD7_LED_FORCE_CTRL(index);
+		mask = QCA807X_LED_FIBER_PATTERN_MASK;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return phy_modify_mmd(phydev, MDIO_MMD_AN, reg, mask,
+			      offload_trigger);
+}
+
+static bool qca807x_led_hw_control_status(struct phy_device *phydev, u8 index)
+{
+	u16 reg;
+
+	if (index > 1)
+		return false;
+
+	reg = QCA807X_MMD7_LED_FORCE_CTRL(index);
+	return qca808x_led_reg_hw_control_status(phydev, reg);
+}
+
+static int qca807x_led_hw_control_get(struct phy_device *phydev, u8 index,
+				      unsigned long *rules)
+{
+	u16 reg;
+	int val;
+
+	if (index > 1)
+		return -EINVAL;
+
+	/* Check if we have hw control enabled */
+	if (qca807x_led_hw_control_status(phydev, index))
+		return -EINVAL;
+
+	/* Parsing specific to netdev trigger */
+	switch (phydev->port) {
+	case PORT_TP:
+		reg = QCA807X_MMD7_LED_CTRL(index);
+		val = phy_read_mmd(phydev, MDIO_MMD_AN, reg);
+		if (val & QCA808X_LED_TX_BLINK)
+			set_bit(TRIGGER_NETDEV_TX, rules);
+		if (val & QCA808X_LED_RX_BLINK)
+			set_bit(TRIGGER_NETDEV_RX, rules);
+		if (val & QCA808X_LED_SPEED10_ON)
+			set_bit(TRIGGER_NETDEV_LINK_10, rules);
+		if (val & QCA808X_LED_SPEED100_ON)
+			set_bit(TRIGGER_NETDEV_LINK_100, rules);
+		if (val & QCA808X_LED_SPEED1000_ON)
+			set_bit(TRIGGER_NETDEV_LINK_1000, rules);
+		if (val & QCA808X_LED_HALF_DUPLEX_ON)
+			set_bit(TRIGGER_NETDEV_HALF_DUPLEX, rules);
+		if (val & QCA808X_LED_FULL_DUPLEX_ON)
+			set_bit(TRIGGER_NETDEV_FULL_DUPLEX, rules);
+		break;
+	case PORT_FIBRE:
+		/* HW control pattern bits are in LED FORCE reg */
+		reg = QCA807X_MMD7_LED_FORCE_CTRL(index);
+		val = phy_read_mmd(phydev, MDIO_MMD_AN, reg);
+		if (val & QCA807X_LED_FIBER_TXACT_BLK_EN)
+			set_bit(TRIGGER_NETDEV_TX, rules);
+		if (val & QCA807X_LED_FIBER_RXACT_BLK_EN)
+			set_bit(TRIGGER_NETDEV_RX, rules);
+		if (val & QCA807X_LED_FIBER_100FX_ON_EN)
+			set_bit(TRIGGER_NETDEV_LINK_100, rules);
+		if (val & QCA807X_LED_FIBER_1000BX_ON_EN)
+			set_bit(TRIGGER_NETDEV_LINK_1000, rules);
+		if (val & QCA807X_LED_FIBER_HDX_ON_EN)
+			set_bit(TRIGGER_NETDEV_HALF_DUPLEX, rules);
+		if (val & QCA807X_LED_FIBER_FDX_ON_EN)
+			set_bit(TRIGGER_NETDEV_FULL_DUPLEX, rules);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int qca807x_led_hw_control_reset(struct phy_device *phydev, u8 index)
+{
+	u16 reg, mask;
+
+	if (index > 1)
+		return -EINVAL;
+
+	switch (phydev->port) {
+	case PORT_TP:
+		reg = QCA807X_MMD7_LED_CTRL(index);
+		mask = QCA808X_LED_PATTERN_MASK;
+		break;
+	case PORT_FIBRE:
+		/* HW control pattern bits are in LED FORCE reg */
+		reg = QCA807X_MMD7_LED_FORCE_CTRL(index);
+		mask = QCA807X_LED_FIBER_PATTERN_MASK;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return phy_clear_bits_mmd(phydev, MDIO_MMD_AN, reg, mask);
+}
+
+static int qca807x_led_brightness_set(struct phy_device *phydev,
+				      u8 index, enum led_brightness value)
+{
+	u16 reg;
+	int ret;
+
+	if (index > 1)
+		return -EINVAL;
+
+	/* If we are setting off the LED reset any hw control rule */
+	if (!value) {
+		ret = qca807x_led_hw_control_reset(phydev, index);
+		if (ret)
+			return ret;
+	}
+
+	reg = QCA807X_MMD7_LED_FORCE_CTRL(index);
+	return qca808x_led_reg_brightness_set(phydev, reg, value);
+}
+
+static int qca807x_led_blink_set(struct phy_device *phydev, u8 index,
+				 unsigned long *delay_on,
+				 unsigned long *delay_off)
+{
+	u16 reg;
+
+	if (index > 1)
+		return -EINVAL;
+
+	reg = QCA807X_MMD7_LED_FORCE_CTRL(index);
+	return qca808x_led_reg_blink_set(phydev, reg, delay_on, delay_off);
+}
+
 #ifdef CONFIG_GPIOLIB
 static int qca807x_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
 {
@@ -496,6 +733,16 @@ static int qca807x_probe(struct phy_device *phydev)
 								     "qcom,dac-disable-bias-current-tweak");
 
 	if (IS_ENABLED(CONFIG_GPIOLIB)) {
+		/* Make sure we don't have mixed leds node and gpio-controller
+		 * to prevent registering leds and having gpio-controller usage
+		 * conflicting with them.
+		 */
+		if (of_find_property(node, "leds", NULL) &&
+		    of_find_property(node, "gpio-controller", NULL)) {
+			phydev_err(phydev, "Invalid property detected. LEDs and gpio-controller are mutually exclusive.");
+			return -EINVAL;
+		}
+
 		/* Do not register a GPIO controller unless flagged for it */
 		if (of_property_read_bool(node, "gpio-controller")) {
 			ret = qca807x_gpio(phydev);
@@ -580,6 +827,11 @@ static struct phy_driver qca807x_drivers[] = {
 		.suspend	= genphy_suspend,
 		.cable_test_start	= qca807x_cable_test_start,
 		.cable_test_get_status	= qca808x_cable_test_get_status,
+		.led_brightness_set = qca807x_led_brightness_set,
+		.led_blink_set = qca807x_led_blink_set,
+		.led_hw_is_supported = qca807x_led_hw_is_supported,
+		.led_hw_control_set = qca807x_led_hw_control_set,
+		.led_hw_control_get = qca807x_led_hw_control_get,
 	},
 };
 module_phy_driver(qca807x_drivers);