r8169: add support for LED's on RTL8168/RTL8101

This adds support for the LED's on most chip versions. Excluded are
the old non-PCIe versions and RTL8125. RTL8125 has a different LED
register layout, support for it will follow later.

LED's can be controlled from userspace using the netdev LED trigger.

Tested on RTL8168h.

Note: The driver can't know which LED's are actually physically
wired. Therefore not every LED device may represent a physically
available LED.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index c07f82ca9755..c6492096aef7 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -285,6 +285,7 @@ enum rtl8168_8101_registers {
 };
 
 enum rtl8168_registers {
+	LED_CTRL		= 0x18,
 	LED_FREQ		= 0x1a,
 	EEE_LED			= 0x1b,
 	ERIDR			= 0x70,
@@ -616,6 +617,7 @@ struct rtl8169_private {
 
 	raw_spinlock_t config25_lock;
 	raw_spinlock_t mac_ocp_lock;
+	struct mutex led_lock;	/* serialize LED ctrl RMW access */
 
 	raw_spinlock_t cfg9346_usage_lock;
 	int cfg9346_usage_count;
@@ -788,6 +790,62 @@ static const struct rtl_cond name = {			\
 							\
 static bool name ## _check(struct rtl8169_private *tp)
 
+int rtl8168_led_mod_ctrl(struct rtl8169_private *tp, u16 mask, u16 val)
+{
+	struct device *dev = tp_to_dev(tp);
+	int ret;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0)
+		return ret;
+
+	mutex_lock(&tp->led_lock);
+	RTL_W16(tp, LED_CTRL, (RTL_R16(tp, LED_CTRL) & ~mask) | val);
+	mutex_unlock(&tp->led_lock);
+
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+int rtl8168_get_led_mode(struct rtl8169_private *tp)
+{
+	struct device *dev = tp_to_dev(tp);
+	int ret;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0)
+		return ret;
+
+	ret = RTL_R16(tp, LED_CTRL);
+
+	pm_runtime_put_sync(dev);
+
+	return ret;
+}
+
+void r8169_get_led_name(struct rtl8169_private *tp, int idx,
+			char *buf, int buf_len)
+{
+	struct pci_dev *pdev = tp->pci_dev;
+	char pdom[8], pfun[8];
+	int domain;
+
+	domain = pci_domain_nr(pdev->bus);
+	if (domain)
+		snprintf(pdom, sizeof(pdom), "P%d", domain);
+	else
+		pdom[0] = '\0';
+
+	if (pdev->multifunction)
+		snprintf(pfun, sizeof(pfun), "f%d", PCI_FUNC(pdev->devfn));
+	else
+		pfun[0] = '\0';
+
+	snprintf(buf, buf_len, "en%sp%ds%d%s-%d::lan", pdom, pdev->bus->number,
+		 PCI_SLOT(pdev->devfn), pfun, idx);
+}
+
 static void r8168fp_adjust_ocp_cmd(struct rtl8169_private *tp, u32 *cmd, int type)
 {
 	/* based on RTL8168FP_OOBMAC_BASE in vendor driver */
@@ -5141,6 +5199,7 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	raw_spin_lock_init(&tp->cfg9346_usage_lock);
 	raw_spin_lock_init(&tp->config25_lock);
 	raw_spin_lock_init(&tp->mac_ocp_lock);
+	mutex_init(&tp->led_lock);
 
 	dev->tstats = devm_netdev_alloc_pcpu_stats(&pdev->dev,
 						   struct pcpu_sw_netstats);
@@ -5297,6 +5356,12 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (rc)
 		return rc;
 
+#if IS_REACHABLE(CONFIG_LEDS_CLASS) && IS_ENABLED(CONFIG_LEDS_TRIGGER_NETDEV)
+	if (tp->mac_version > RTL_GIGA_MAC_VER_06 &&
+	    tp->mac_version < RTL_GIGA_MAC_VER_61)
+		rtl8168_init_leds(dev);
+#endif
+
 	netdev_info(dev, "%s, %pM, XID %03x, IRQ %d\n",
 		    rtl_chip_infos[chipset].name, dev->dev_addr, xid, tp->irq);