From: Kory Maincent (Dent Project) <kory.maincent@bootlin.com>

Add support for PSE event reporting through interrupts. Set up the newly
introduced devm_pse_irq_helper helper to register the interrupt. Events are
reported for over-current and over-temperature conditions.

Reviewed-by: Kyle Swenson <kyle.swenson@est.tech>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Change in v2:
- Remove support for OSS pin and TPC23881 specific port priority management
---
 drivers/net/pse-pd/tps23881.c | 90 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/drivers/net/pse-pd/tps23881.c b/drivers/net/pse-pd/tps23881.c
index 928d9844462c..3e15e2c97b24 100644
--- a/drivers/net/pse-pd/tps23881.c
+++ b/drivers/net/pse-pd/tps23881.c
@@ -17,6 +17,13 @@
 
 #define TPS23881_MAX_CHANS 8
 
+#define TPS23881_REG_IT		0x0
+#define TPS23881_REG_IT_MASK	0x1
+#define TPS23881_REG_IT_IFAULT	BIT(5)
+#define TPS23881_REG_IT_SUPF	BIT(7)
+#define TPS23881_REG_FAULT	0x7
+#define TPS23881_REG_SUPF_EVENT	0xb
+#define TPS23881_REG_TSD	BIT(7)
 #define TPS23881_REG_PW_STATUS	0x10
 #define TPS23881_REG_OP_MODE	0x12
 #define TPS23881_OP_MODE_SEMIAUTO	0xaaaa
@@ -24,6 +31,7 @@
 #define TPS23881_REG_DET_CLA_EN	0x14
 #define TPS23881_REG_GEN_MASK	0x17
 #define TPS23881_REG_NBITACC	BIT(5)
+#define TPS23881_REG_INTEN	BIT(7)
 #define TPS23881_REG_PW_EN	0x19
 #define TPS23881_REG_2PAIR_POL1	0x1e
 #define TPS23881_REG_PORT_MAP	0x26
@@ -1055,6 +1063,82 @@ static int tps23881_flash_sram_fw(struct i2c_client *client)
 	return 0;
 }
 
+static int tps23881_irq_handler(int irq, struct pse_controller_dev *pcdev,
+				unsigned long *notifs,
+				unsigned long *notifs_mask)
+{
+	struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+	struct i2c_client *client = priv->client;
+	int ret, i;
+	u16 val;
+
+	ret = i2c_smbus_read_word_data(client, TPS23881_REG_IT);
+	if (ret < 0)
+		return ret;
+
+	val = (u16)ret;
+	/* The Supply event bit is repeated twice so we only need to read
+	 * the one from the first byte.
+	 */
+	if (val & TPS23881_REG_IT_SUPF) {
+		ret = i2c_smbus_read_word_data(client, TPS23881_REG_SUPF_EVENT);
+		if (ret < 0)
+			return ret;
+
+		if (ret & TPS23881_REG_TSD) {
+			for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+				*notifs_mask |= 1 << i;
+				notifs[i] = ETHTOOL_C33_PSE_EVENT_OVER_TEMP;
+			}
+		}
+	}
+
+	if (val & (TPS23881_REG_IT_IFAULT | TPS23881_REG_IT_IFAULT << 8)) {
+		ret = i2c_smbus_read_word_data(client, TPS23881_REG_FAULT);
+		if (ret < 0)
+			return ret;
+
+		/* Convert interrupt events located in 0xf0f to 0xff be
+		 * aligned with the port number.
+		 */
+		val = (u16)(((ret >> 4) & 0xf0) | (ret & 0x0f));
+
+		*notifs_mask |= val;
+		for_each_set_bit(i, notifs_mask, TPS23881_MAX_CHANS)
+			notifs[i] = ETHTOOL_C33_PSE_EVENT_OVER_CURRENT;
+	}
+
+	return 0;
+}
+
+static int tps23881_setup_irq(struct tps23881_priv *priv, int irq)
+{
+	struct i2c_client *client = priv->client;
+	struct pse_irq_desc irq_desc = {
+		.name = "tps23881-irq",
+		.map_event = tps23881_irq_handler,
+	};
+	int ret;
+	u16 val;
+
+	val = TPS23881_REG_IT_IFAULT | TPS23881_REG_IT_SUPF |
+	      TPS23881_REG_IT_IFAULT << 8 | TPS23881_REG_IT_SUPF << 8;
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_IT_MASK, val);
+	if (ret)
+		return ret;
+
+	ret = i2c_smbus_read_word_data(client, TPS23881_REG_GEN_MASK);
+	if (ret < 0)
+		return ret;
+
+	val = (u16)(ret | TPS23881_REG_INTEN | TPS23881_REG_INTEN << 8);
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_GEN_MASK, val);
+	if (ret < 0)
+		return ret;
+
+	return devm_pse_irq_helper(&priv->pcdev, irq, 0, &irq_desc);
+}
+
 static int tps23881_i2c_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
@@ -1135,6 +1219,12 @@ static int tps23881_i2c_probe(struct i2c_client *client)
 				     "failed to register PSE controller\n");
 	}
 
+	if (client->irq) {
+		ret = tps23881_setup_irq(priv, client->irq);
+		if (ret)
+			return ret;
+	}
+
 	return ret;
 }
 

-- 
2.34.1