net: phy: marvell10g: add thermal hwmon device

Add a thermal monitoring device for the Marvell 88x3310, which updates
once a second.  We also need to hook into the suspend/resume mechanism
to ensure that the thermal monitoring is reconfigured when we resume.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 182 insertions, 2 deletions

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 9564916d2d7b..f77a2d9e7f9d 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -21,8 +21,10 @@
  * If both the fiber and copper ports are connected, the first to gain
  * link takes priority and the other port is completely locked out.
  */
-#include <linux/phy.h>
+#include <linux/ctype.h>
+#include <linux/hwmon.h>
 #include <linux/marvell_phy.h>
+#include <linux/phy.h>
 
 enum {
         MV_PCS_BASE_T           = 0x0000,
@@ -40,6 +42,19 @@ enum {
          */
         MV_AN_CTRL1000          = 0x8000, /* 1000base-T control register */
         MV_AN_STAT1000          = 0x8001, /* 1000base-T status register */
+
+        /* Vendor2 MMD registers */
+        MV_V2_TEMP_CTRL         = 0xf08a,
+        MV_V2_TEMP_CTRL_MASK    = 0xc000,
+        MV_V2_TEMP_CTRL_SAMPLE  = 0x0000,
+        MV_V2_TEMP_CTRL_DISABLE = 0xc000,
+        MV_V2_TEMP              = 0xf08c,
+        MV_V2_TEMP_UNKNOWN      = 0x9600, /* unknown function */
+};
+
+struct mv3310_priv {
+        struct device *hwmon_dev;
+        char *hwmon_name;
 };
 
 static int mv3310_modify(struct phy_device *phydev, int devad, u16 reg,
@@ -60,17 +75,180 @@ static int mv3310_modify(struct phy_device *phydev, int devad, u16 reg,
         return ret < 0 ? ret : 1;
 }
 
+#ifdef CONFIG_HWMON
+static umode_t mv3310_hwmon_is_visible(const void *data,
+                                       enum hwmon_sensor_types type,
+                                       u32 attr, int channel)
+{
+        if (type == hwmon_chip && attr == hwmon_chip_update_interval)
+                return 0444;
+        if (type == hwmon_temp && attr == hwmon_temp_input)
+                return 0444;
+        return 0;
+}
+
+static int mv3310_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+                             u32 attr, int channel, long *value)
+{
+        struct phy_device *phydev = dev_get_drvdata(dev);
+        int temp;
+
+        if (type == hwmon_chip && attr == hwmon_chip_update_interval) {
+                *value = MSEC_PER_SEC;
+                return 0;
+        }
+
+        if (type == hwmon_temp && attr == hwmon_temp_input) {
+                temp = phy_read_mmd(phydev, MDIO_MMD_VEND2, MV_V2_TEMP);
+                if (temp < 0)
+                        return temp;
+
+                *value = ((temp & 0xff) - 75) * 1000;
+
+                return 0;
+        }
+
+        return -EOPNOTSUPP;
+}
+
+static const struct hwmon_ops mv3310_hwmon_ops = {
+        .is_visible = mv3310_hwmon_is_visible,
+        .read = mv3310_hwmon_read,
+};
+
+static u32 mv3310_hwmon_chip_config[] = {
+        HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL,
+        0,
+};
+
+static const struct hwmon_channel_info mv3310_hwmon_chip = {
+        .type = hwmon_chip,
+        .config = mv3310_hwmon_chip_config,
+};
+
+static u32 mv3310_hwmon_temp_config[] = {
+        HWMON_T_INPUT,
+        0,
+};
+
+static const struct hwmon_channel_info mv3310_hwmon_temp = {
+        .type = hwmon_temp,
+        .config = mv3310_hwmon_temp_config,
+};
+
+static const struct hwmon_channel_info *mv3310_hwmon_info[] = {
+        &mv3310_hwmon_chip,
+        &mv3310_hwmon_temp,
+        NULL,
+};
+
+static const struct hwmon_chip_info mv3310_hwmon_chip_info = {
+        .ops = &mv3310_hwmon_ops,
+        .info = mv3310_hwmon_info,
+};
+
+static int mv3310_hwmon_config(struct phy_device *phydev, bool enable)
+{
+        u16 val;
+        int ret;
+
+        ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, MV_V2_TEMP,
+                            MV_V2_TEMP_UNKNOWN);
+        if (ret < 0)
+                return ret;
+
+        val = enable ? MV_V2_TEMP_CTRL_SAMPLE : MV_V2_TEMP_CTRL_DISABLE;
+        ret = mv3310_modify(phydev, MDIO_MMD_VEND2, MV_V2_TEMP_CTRL,
+                            MV_V2_TEMP_CTRL_MASK, val);
+
+        return ret < 0 ? ret : 0;
+}
+
+static void mv3310_hwmon_disable(void *data)
+{
+        struct phy_device *phydev = data;
+
+        mv3310_hwmon_config(phydev, false);
+}
+
+static int mv3310_hwmon_probe(struct phy_device *phydev)
+{
+        struct device *dev = &phydev->mdio.dev;
+        struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
+        int i, j, ret;
+
+        priv->hwmon_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
+        if (!priv->hwmon_name)
+                return -ENODEV;
+
+        for (i = j = 0; priv->hwmon_name[i]; i++) {
+                if (isalnum(priv->hwmon_name[i])) {
+                        if (i != j)
+                                priv->hwmon_name[j] = priv->hwmon_name[i];
+                        j++;
+                }
+        }
+        priv->hwmon_name[j] = '\0';
+
+        ret = mv3310_hwmon_config(phydev, true);
+        if (ret)
+                return ret;
+
+        ret = devm_add_action_or_reset(dev, mv3310_hwmon_disable, phydev);
+        if (ret)
+                return ret;
+
+        priv->hwmon_dev = devm_hwmon_device_register_with_info(dev,
+                                priv->hwmon_name, phydev,
+                                &mv3310_hwmon_chip_info, NULL);
+
+        return PTR_ERR_OR_ZERO(priv->hwmon_dev);
+}
+#else
+static inline int mv3310_hwmon_config(struct phy_device *phydev, bool enable)
+{
+        return 0;
+}
+
+static int mv3310_hwmon_probe(struct phy_device *phydev)
+{
+        return 0;
+}
+#endif
+
 static int mv3310_probe(struct phy_device *phydev)
 {
+        struct mv3310_priv *priv;
         u32 mmd_mask = MDIO_DEVS_PMAPMD | MDIO_DEVS_AN;
+        int ret;
 
         if (!phydev->is_c45 ||
             (phydev->c45_ids.devices_in_package & mmd_mask) != mmd_mask)
                 return -ENODEV;
 
+        priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        dev_set_drvdata(&phydev->mdio.dev, priv);
+
+        ret = mv3310_hwmon_probe(phydev);
+        if (ret)
+                return ret;
+
+        return 0;
+}
+
+static int mv3310_suspend(struct phy_device *phydev)
+{
         return 0;
 }
 
+static int mv3310_resume(struct phy_device *phydev)
+{
+        return mv3310_hwmon_config(phydev, true);
+}
+
 static int mv3310_config_init(struct phy_device *phydev)
 {
         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported) = { 0, };
@@ -367,9 +545,11 @@ static struct phy_driver mv3310_drivers[] = {
                                   SUPPORTED_FIBRE |
                                   SUPPORTED_10000baseT_Full |
                                   SUPPORTED_Backplane,
-                .probe          = mv3310_probe,
                 .soft_reset     = gen10g_no_soft_reset,
                 .config_init    = mv3310_config_init,
+                .probe          = mv3310_probe,
+                .suspend        = mv3310_suspend,
+                .resume         = mv3310_resume,
                 .config_aneg    = mv3310_config_aneg,
                 .aneg_done      = mv3310_aneg_done,
                 .read_status    = mv3310_read_status,