netdev - [PATCH v4 1/4] Fixed PHY: Add fixed_phy_change

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Message-Id: <20181214141708.21439-1-joakim.tjernlund@infinera.com>
Date:   Fri, 14 Dec 2018 15:17:05 +0100
From:   Joakim Tjernlund <joakim.tjernlund@...inera.com>
To:     netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, claudiu.manoil@....com,
        madalin.bucur@....com, leoyang.li@....com
Cc:     Joakim Tjernlund <joakim.tjernlund@...inera.com>
Subject: [PATCH v4 1/4] Fixed PHY: Add fixed_phy_change_carrier()

Drivers can use this as .ndo_change_carrier() to change carrier
via /sys/class/net/ethX/carrier.

Signed-off-by: Joakim Tjernlund <joakim.tjernlund@...inera.com>
---
 v4 - format fixes.

 v3 - Moved the logic into fixed PHY to minimize eth driver
      impact

 v2 - Only allow carrier changes for Fixed PHYs

 drivers/net/phy/fixed_phy.c | 24 +++++++++++++++++++++++-
 include/linux/phy_fixed.h   |  5 +++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c
index 67b260877f30..37f732b5a532 100644
--- a/drivers/net/phy/fixed_phy.c
+++ b/drivers/net/phy/fixed_phy.c
@@ -25,6 +25,7 @@
 #include <linux/gpio.h>
 #include <linux/seqlock.h>
 #include <linux/idr.h>
+#include <linux/netdevice.h>
 
 #include "swphy.h"
 
@@ -38,6 +39,7 @@ struct fixed_phy {
 	struct phy_device *phydev;
 	seqcount_t seqcount;
 	struct fixed_phy_status status;
+	bool no_carrier;
 	int (*link_update)(struct net_device *, struct fixed_phy_status *);
 	struct list_head node;
 	int link_gpio;
@@ -48,9 +50,28 @@ static struct fixed_mdio_bus platform_fmb = {
 	.phys = LIST_HEAD_INIT(platform_fmb.phys),
 };
 
+int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier)
+{
+	struct fixed_mdio_bus *fmb = &platform_fmb;
+	struct phy_device *phydev = dev->phydev;
+	struct fixed_phy *fp;
+
+	if (!phydev || !phydev->mdio.bus)
+		return -EINVAL;
+
+	list_for_each_entry(fp, &fmb->phys, node) {
+		if (fp->addr == phydev->mdio.addr) {
+			fp->no_carrier = !new_carrier;
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(fixed_phy_change_carrier);
+
 static void fixed_phy_update(struct fixed_phy *fp)
 {
-	if (gpio_is_valid(fp->link_gpio))
+	if (!fp->no_carrier && gpio_is_valid(fp->link_gpio))
 		fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
 }
 
@@ -66,6 +87,7 @@ static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
 
 			do {
 				s = read_seqcount_begin(&fp->seqcount);
+				fp->status.link = !fp->no_carrier;
 				/* Issue callback if user registered it. */
 				if (fp->link_update) {
 					fp->link_update(fp->phydev->attached_dev,
diff --git a/include/linux/phy_fixed.h b/include/linux/phy_fixed.h
index ee54453a40a0..9525567b1951 100644
--- a/include/linux/phy_fixed.h
+++ b/include/linux/phy_fixed.h
@@ -13,6 +13,7 @@ struct fixed_phy_status {
 struct device_node;
 
 #if IS_ENABLED(CONFIG_FIXED_PHY)
+extern int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier);
 extern int fixed_phy_add(unsigned int irq, int phy_id,
 			 struct fixed_phy_status *status,
 			 int link_gpio);
@@ -47,6 +48,10 @@ static inline int fixed_phy_set_link_update(struct phy_device *phydev,
 {
 	return -ENODEV;
 }
+static inline int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier)
+{
+	return -EINVAL;
+}
 #endif /* CONFIG_FIXED_PHY */
 
 #endif /* __PHY_FIXED_H */
-- 
2.18.1