[PATCH v7 08/14] USB: typec: tps6598x: Add interrupt support for TPS25750

[Abdel Alkuor <alkuor@gmail.com>]

From: Abdel Alkuor <abdelalkuor@geotab.com>

tps25750 event registers structure is different than tps6598x's,
tps25750 has 11 bytes of events which are read at once where
tps6598x has two event registers of 8 bytes each which are read
separately. Likewise MASK event registers. Also, not all events
are supported in both devices.

Create a new handler to accommodate tps25750 interrupt

Signed-off-by: Abdel Alkuor <abdelalkuor@geotab.com>
---
Changes in v7:
  - Add driver name to commit subject
  - Create tps25750 interrupt handler
Changes in v6:
  - Create tipd callbacks factory 
Changes in v5:
  - Incorporating tps25750 into tps6598x driver

 drivers/usb/typec/tipd/core.c | 90 ++++++++++++++++++++++++++++++++---
 1 file changed, 84 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 56ffffe225f2..40a76826a44e 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -101,6 +101,10 @@ static const char *const modes[] = {
 /* Unrecognized commands will be replaced with "!CMD" */
 #define INVALID_CMD(_cmd_)		(_cmd_ == 0x444d4321)
 
+struct tipd_data {
+	irq_handler_t irq_handler;
+};
+
 struct tps6598x {
 	struct device *dev;
 	struct regmap *regmap;
@@ -118,9 +122,11 @@ struct tps6598x {
 	enum power_supply_usb_type usb_type;
 
 	int wakeup;
+	u32 status; /* status reg */
 	u16 pwr_status;
 	struct delayed_work	wq_poll;
-	irq_handler_t irq_handler;
+
+	struct tipd_data cb;
 };
 
 static enum power_supply_property tps6598x_psy_props[] = {
@@ -545,6 +551,64 @@ static irqreturn_t cd321x_interrupt(int irq, void *data)
 	return IRQ_NONE;
 }
 
+static bool tps6598x_has_role_changed(struct tps6598x *tps, u32 status)
+{
+	status ^= tps->status;
+
+	return status & (TPS_STATUS_PORTROLE | TPS_STATUS_DATAROLE);
+}
+
+static irqreturn_t tps25750_interrupt(int irq, void *data)
+{
+	struct tps6598x *tps = data;
+	u64 event[2] = { };
+	u32 status;
+	int ret;
+
+	mutex_lock(&tps->lock);
+
+	ret = tps6598x_block_read(tps, TPS_REG_INT_EVENT1, event, 11);
+	if (ret) {
+		dev_err(tps->dev, "%s: failed to read events\n", __func__);
+		goto err_unlock;
+	}
+
+	if (!(event[0] | event[1]))
+		goto err_unlock;
+
+	if (!tps6598x_read_status(tps, &status))
+		goto err_clear_ints;
+
+	if ((event[0] | event[1]) & TPS_REG_INT_POWER_STATUS_UPDATE)
+		if (!tps6598x_read_power_status(tps))
+			goto err_clear_ints;
+
+	if ((event[0] | event[1]) & TPS_REG_INT_DATA_STATUS_UPDATE)
+		if (!tps6598x_read_data_status(tps))
+			goto err_clear_ints;
+
+	/*
+	 * data/port roles could be updated independently after
+	 * a plug event. Therefore, we need to check
+	 * for pr/dr status change to set TypeC dr/pr accordingly.
+	 */
+	if ((event[0] | event[1]) & TPS_REG_INT_PLUG_EVENT ||
+	    tps6598x_has_role_changed(tps, status))
+		tps6598x_handle_plug_event(tps, status);
+
+	tps->status = status;
+
+err_clear_ints:
+	tps6598x_block_write(tps, TPS_REG_INT_CLEAR1, event, 11);
+
+err_unlock:
+	mutex_unlock(&tps->lock);
+
+	if (event[0] | event[1])
+		return IRQ_HANDLED;
+	return IRQ_NONE;
+}
+
 static irqreturn_t tps6598x_interrupt(int irq, void *data)
 {
 	struct tps6598x *tps = data;
@@ -600,7 +664,7 @@ static void tps6598x_poll_work(struct work_struct *work)
 	struct tps6598x *tps = container_of(to_delayed_work(work),
 					    struct tps6598x, wq_poll);
 
-	tps->irq_handler(0, tps);
+	tps->cb.irq_handler(0, tps);
 	queue_delayed_work(system_power_efficient_wq,
 			   &tps->wq_poll, msecs_to_jiffies(POLL_INTERVAL));
 }
@@ -967,9 +1031,20 @@ static int tps25750_apply_patch(struct tps6598x *tps)
 	return 0;
 };
 
+static const struct tipd_data cd321x_data = {
+	.irq_handler = cd321x_interrupt,
+};
+
+static const struct tipd_data tps6598x_data = {
+	.irq_handler = tps6598x_interrupt,
+};
+
+static const struct tipd_data tps25750_data = {
+	.irq_handler = tps25750_interrupt,
+};
+
 static int tps6598x_probe(struct i2c_client *client)
 {
-	irq_handler_t irq_handler = tps6598x_interrupt;
 	struct device_node *np = client->dev.of_node;
 	struct typec_capability typec_cap = { };
 	struct tps6598x *tps;
@@ -1017,15 +1092,18 @@ static int tps6598x_probe(struct i2c_client *client)
 			APPLE_CD_REG_INT_DATA_STATUS_UPDATE |
 			APPLE_CD_REG_INT_PLUG_EVENT;
 
-		irq_handler = cd321x_interrupt;
+		tps->cb = cd321x_data;
 	} else {
+		if (is_tps25750)
+			tps->cb = tps25750_data;
+		else
+			tps->cb = tps6598x_data;
 		/* Enable power status, data status and plug event interrupts */
 		mask1 = TPS_REG_INT_POWER_STATUS_UPDATE |
 			TPS_REG_INT_DATA_STATUS_UPDATE |
 			TPS_REG_INT_PLUG_EVENT;
 	}
 
-	tps->irq_handler = irq_handler;
 	/* Make sure the controller has application firmware running */
 	ret = tps6598x_check_mode(tps);
 	if (ret < 0)
@@ -1125,7 +1203,7 @@ static int tps6598x_probe(struct i2c_client *client)
 
 	if (client->irq) {
 		ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
-						irq_handler,
+						tps->cb.irq_handler,
 						IRQF_SHARED | IRQF_ONESHOT,
 						dev_name(&client->dev), tps);
 	} else {
-- 
2.34.1