linux-kernel - [PATCH v2 2/2] usb: typec: tcpci_maxim: configure charging & data paths

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Date:   Thu, 11 Mar 2021 21:24:43 -0800
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kyle Tso <kyletso@...gle.com>,
        Badhri Jagan Sridharan <badhri@...gle.com>
Subject: [PATCH v2 2/2] usb: typec: tcpci_maxim: configure charging & data paths

The change exposes the data_role and the orientation as a extcon
interface for configuring the USB data controller.

Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
---
Changes since V1:
- Dropped changes related to get_/set_current_limit and pd_capable
  callback. Will send them in as separate patches.
---
 drivers/usb/typec/tcpm/tcpci_maxim.c | 56 ++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c b/drivers/usb/typec/tcpm/tcpci_maxim.c
index 041a1c393594..1210445713ee 100644
--- a/drivers/usb/typec/tcpm/tcpci_maxim.c
+++ b/drivers/usb/typec/tcpm/tcpci_maxim.c
@@ -7,6 +7,8 @@
 
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
+#include <linux/extcon.h>
+#include <linux/extcon-provider.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
@@ -46,6 +48,8 @@ struct max_tcpci_chip {
 	struct device *dev;
 	struct i2c_client *client;
 	struct tcpm_port *port;
+	bool attached;
+	struct extcon_dev *extcon;
 };
 
 static const struct regmap_range max_tcpci_tcpci_range[] = {
@@ -439,6 +443,39 @@ static int tcpci_init(struct tcpci *tcpci, struct tcpci_data *data)
 	return -1;
 }
 
+static void max_tcpci_set_roles(struct tcpci *tcpci, struct tcpci_data *data, bool attached,
+				enum typec_role role, enum typec_data_role data_role)
+{
+	struct max_tcpci_chip *chip = tdata_to_max_tcpci(data);
+
+	chip->attached = attached;
+
+	if (!attached) {
+		extcon_set_state_sync(chip->extcon, EXTCON_USB_HOST, 0);
+		extcon_set_state_sync(chip->extcon, EXTCON_USB, 0);
+		return;
+	}
+
+	extcon_set_state_sync(chip->extcon, data_role == TYPEC_HOST ? EXTCON_USB_HOST : EXTCON_USB,
+			      1);
+}
+
+static void max_tcpci_set_cc_polarity(struct tcpci *tcpci, struct tcpci_data *data,
+				      enum typec_cc_polarity polarity)
+{
+	struct max_tcpci_chip *chip = tdata_to_max_tcpci(data);
+
+	extcon_set_property(chip->extcon, EXTCON_USB, EXTCON_PROP_USB_TYPEC_POLARITY,
+			    (union extcon_property_value)(int)polarity);
+	extcon_set_property(chip->extcon, EXTCON_USB_HOST, EXTCON_PROP_USB_TYPEC_POLARITY,
+			    (union extcon_property_value)(int)polarity);
+}
+
+static const unsigned int usbpd_extcon[] = {
+	EXTCON_USB,
+	EXTCON_USB_HOST,
+};
+
 static int max_tcpci_probe(struct i2c_client *client, const struct i2c_device_id *i2c_id)
 {
 	int ret;
@@ -472,6 +509,8 @@ static int max_tcpci_probe(struct i2c_client *client, const struct i2c_device_id
 	chip->data.auto_discharge_disconnect = true;
 	chip->data.vbus_vsafe0v = true;
 	chip->data.set_partner_usb_comm_capable = max_tcpci_set_partner_usb_comm_capable;
+	chip->data.set_roles = max_tcpci_set_roles;
+	chip->data.set_cc_polarity = max_tcpci_set_cc_polarity;
 
 	max_tcpci_init_regs(chip);
 	chip->tcpci = tcpci_register_port(chip->dev, &chip->data);
@@ -484,6 +523,23 @@ static int max_tcpci_probe(struct i2c_client *client, const struct i2c_device_id
 	if (ret < 0)
 		goto unreg_port;
 
+	chip->extcon = devm_extcon_dev_allocate(&client->dev, usbpd_extcon);
+	if (IS_ERR(chip->extcon)) {
+		dev_err(&client->dev, "Error allocating extcon: %ld\n", PTR_ERR(chip->extcon));
+		ret = PTR_ERR(chip->extcon);
+		goto unreg_port;
+	}
+
+	ret = devm_extcon_dev_register(&client->dev, chip->extcon);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to register extcon device");
+		goto unreg_port;
+	}
+
+	extcon_set_property_capability(chip->extcon, EXTCON_USB, EXTCON_PROP_USB_TYPEC_POLARITY);
+	extcon_set_property_capability(chip->extcon, EXTCON_USB_HOST,
+				       EXTCON_PROP_USB_TYPEC_POLARITY);
+
 	device_init_wakeup(chip->dev, true);
 	return 0;
 
-- 
2.31.0.rc2.261.g7f71774620-goog