net: phy: broadcom: Add support for setting LED brightness

Broadcom PHYs have two LEDs selector registers which allow us to control
the LED assignment, including how to turn them on/off.

Signed-off-by: Florian Fainelli <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/phy/bcm-phy-lib.c

···
 }
 EXPORT_SYMBOL_GPL(bcm_phy_wol_isr);
 
+int bcm_phy_led_brightness_set(struct phy_device *phydev,
+			       u8 index, enum led_brightness value)
+{
+	u8 led_num;
+	int ret;
+	u16 reg;
+
+	if (index >= 4)
+		return -EINVAL;
+
+	/* Two LEDS per register */
+	led_num = index % 2;
+	reg = index >= 2 ? BCM54XX_SHD_LEDS2 : BCM54XX_SHD_LEDS1;
+
+	ret = bcm_phy_read_shadow(phydev, reg);
+	if (ret < 0)
+		return ret;
+
+	ret &= ~(BCM_LED_SRC_MASK << BCM54XX_SHD_LEDS_SHIFT(led_num));
+	if (value == LED_OFF)
+		ret |= BCM_LED_SRC_OFF << BCM54XX_SHD_LEDS_SHIFT(led_num);
+	else
+		ret |= BCM_LED_SRC_ON << BCM54XX_SHD_LEDS_SHIFT(led_num);
+	return bcm_phy_write_shadow(phydev, reg, ret);
+}
+EXPORT_SYMBOL_GPL(bcm_phy_led_brightness_set);
+
 MODULE_DESCRIPTION("Broadcom PHY Library");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Broadcom Corporation");

drivers/net/phy/bcm-phy-lib.h

···
 void bcm_phy_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol);
 irqreturn_t bcm_phy_wol_isr(int irq, void *dev_id);
 
+int bcm_phy_led_brightness_set(struct phy_device *phydev,
+			       u8 index, enum led_brightness value);
+
 #endif /* _LINUX_BCM_PHY_LIB_H */

drivers/net/phy/broadcom.c

···
 	.resume		= bcm54xx_resume,
 	.get_wol	= bcm54xx_phy_get_wol,
 	.set_wol	= bcm54xx_phy_set_wol,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM5461,
 	.phy_id_mask	= 0xfffffff0,
···
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM54612E,
 	.phy_id_mask	= 0xfffffff0,
···
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM54616S,
 	.phy_id_mask	= 0xfffffff0,
···
 	.read_status	= bcm54616s_read_status,
 	.probe		= bcm54616s_probe,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM5464,
 	.phy_id_mask	= 0xfffffff0,
···
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM5481,
 	.phy_id_mask	= 0xfffffff0,
···
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id         = PHY_ID_BCM54810,
 	.phy_id_mask    = 0xfffffff0,
···
 	.suspend	= bcm54xx_suspend,
 	.resume		= bcm54xx_resume,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id         = PHY_ID_BCM54811,
 	.phy_id_mask    = 0xfffffff0,
···
 	.suspend	= bcm54xx_suspend,
 	.resume		= bcm54xx_resume,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM5482,
 	.phy_id_mask	= 0xfffffff0,
···
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM50610,
 	.phy_id_mask	= 0xfffffff0,
···
 	.link_change_notify	= bcm54xx_link_change_notify,
 	.suspend	= bcm54xx_suspend,
 	.resume		= bcm54xx_resume,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM50610M,
 	.phy_id_mask	= 0xfffffff0,
···
 	.link_change_notify	= bcm54xx_link_change_notify,
 	.suspend	= bcm54xx_suspend,
 	.resume		= bcm54xx_resume,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM57780,
 	.phy_id_mask	= 0xfffffff0,
···
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCMAC131,
 	.phy_id_mask	= 0xfffffff0,
···
 	.get_stats	= bcm54xx_get_stats,
 	.probe		= bcm54xx_phy_probe,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM53125,
 	.phy_id_mask	= 0xfffffff0,
···
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id		= PHY_ID_BCM53128,
 	.phy_id_mask	= 0xfffffff0,
···
 	.config_intr	= bcm_phy_config_intr,
 	.handle_interrupt = bcm_phy_handle_interrupt,
 	.link_change_notify	= bcm54xx_link_change_notify,
+	.led_brightness_set	= bcm_phy_led_brightness_set,
 }, {
 	.phy_id         = PHY_ID_BCM89610,
 	.phy_id_mask    = 0xfffffff0,

include/linux/brcmphy.h

···
 #define BCM_LED_SRC_OPENSHORT	0xb
 #define BCM_LED_SRC_OFF		0xe	/* Tied high */
 #define BCM_LED_SRC_ON		0xf	/* Tied low */
+#define BCM_LED_SRC_MASK	GENMASK(3, 0)
 
 /*
  * Broadcom Multicolor LED configurations (expansion register 4)
···
 
 #define BCM54XX_SHD_LEDS1	0x0d	/* 01101: LED Selector 1 */
 					/* LED3 / ~LINKSPD[2] selector */
+#define BCM54XX_SHD_LEDS_SHIFT(led)	(4 * (led))
 #define BCM54XX_SHD_LEDS1_LED3(src)	((src & 0xf) << 4)
 					/* LED1 / ~LINKSPD[1] selector */
 #define BCM54XX_SHD_LEDS1_LED1(src)	((src & 0xf) << 0)
+#define BCM54XX_SHD_LEDS2	0x0e	/* 01110: LED Selector 2 */
 #define BCM54XX_SHD_RGMII_MODE	0x0b	/* 01011: RGMII Mode Selector */
 #define BCM5482_SHD_SSD		0x14	/* 10100: Secondary SerDes control */
 #define BCM5482_SHD_SSD_LEDM	0x0008	/* SSD LED Mode enable */