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Date: Thu, 11 Mar 2021 02:03:12 -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>,
Rob Herring <robh+dt@...nel.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
Kyle Tso <kyletso@...gle.com>, devicetree@...r.kernel.org,
Badhri Jagan Sridharan <badhri@...gle.com>
Subject: [PATCH 3/4] usb: typec: tcpci_maxim: configure charging & data paths
This change allows the driver to configure input current/voltage
limit for the charging path. The driver sets current_max and voltage_max
values of the power supply identified through chg-psy-name.
The change also 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>
---
drivers/usb/typec/tcpm/tcpci_maxim.c | 126 ++++++++++++++++++++++++++-
1 file changed, 125 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c b/drivers/usb/typec/tcpm/tcpci_maxim.c
index 041a1c393594..365ff4c18146 100644
--- a/drivers/usb/typec/tcpm/tcpci_maxim.c
+++ b/drivers/usb/typec/tcpm/tcpci_maxim.c
@@ -7,8 +7,11 @@
#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/power_supply.h>
#include <linux/regmap.h>
#include <linux/usb/pd.h>
#include <linux/usb/tcpm.h>
@@ -46,6 +49,10 @@ struct max_tcpci_chip {
struct device *dev;
struct i2c_client *client;
struct tcpm_port *port;
+ bool pd_capable;
+ bool attached;
+ struct power_supply *chg_psy;
+ struct extcon_dev *extcon;
};
static const struct regmap_range max_tcpci_tcpci_range[] = {
@@ -439,11 +446,92 @@ static int tcpci_init(struct tcpci *tcpci, struct tcpci_data *data)
return -1;
}
+static int max_tcpci_get_current_limit(struct tcpci *tcpci, struct tcpci_data *data)
+{
+ struct max_tcpci_chip *chip = tdata_to_max_tcpci(data);
+ union power_supply_propval val = {0};
+ int ret;
+
+ if (!chip->chg_psy)
+ return 0;
+
+ ret = power_supply_get_property(chip->chg_psy, POWER_SUPPLY_PROP_CURRENT_MAX, &val);
+ return ret < 0 ? ret : val.intval;
+}
+
+static int max_tcpci_set_current_limit(struct tcpci *tcpci, struct tcpci_data *data, u32 max_ma,
+ u32 mv)
+{
+ struct max_tcpci_chip *chip = tdata_to_max_tcpci(data);
+ union power_supply_propval val;
+ int ret;
+
+ if (!chip->chg_psy)
+ return 0;
+
+ val.intval = mv;
+ ret = power_supply_set_property(chip->chg_psy, POWER_SUPPLY_PROP_VOLTAGE_MAX, &val);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Disregard 0mA vote for Rp-default value. Rp-default current values
+ * would be inferred from other sources such BC1.2 and data stack.
+ */
+ if (!chip->pd_capable && max_ma == 0 && chip->attached)
+ return 0;
+
+ val.intval = max_ma;
+ return power_supply_set_property(chip->chg_psy, POWER_SUPPLY_PROP_CURRENT_MAX, &val);
+}
+
+static void max_tcpci_set_pd_capable(struct tcpci *tcpci, struct tcpci_data *data, bool capable)
+{
+ struct max_tcpci_chip *chip = tdata_to_max_tcpci(data);
+
+ chip->pd_capable = capable;
+}
+
+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;
struct max_tcpci_chip *chip;
u8 power_status;
+ char *chg_psy_name;
+ struct device_node *dn;
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
@@ -472,6 +560,11 @@ 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.get_current_limit = max_tcpci_get_current_limit;
+ chip->data.set_current_limit = max_tcpci_set_current_limit;
+ chip->data.set_pd_capable = max_tcpci_set_pd_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);
@@ -484,9 +577,38 @@ static int max_tcpci_probe(struct i2c_client *client, const struct i2c_device_id
if (ret < 0)
goto unreg_port;
+ dn = dev_of_node(&client->dev);
+ if (!dn) {
+ dev_err(&client->dev, "of node not found\n");
+ ret = -EINVAL;
+ goto unreg_port;
+ }
+ chg_psy_name = (char *)of_get_property(dn, "chg-psy-name", NULL);
+ if (chg_psy_name)
+ chip->chg_psy = power_supply_get_by_name(chg_psy_name);
+
+ 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 psy_put;
+ }
+
+ ret = devm_extcon_dev_register(&client->dev, chip->extcon);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to register extcon device");
+ goto psy_put;
+ }
+
+ 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;
-
+psy_put:
+ if (chip->chg_psy)
+ power_supply_put(chip->chg_psy);
unreg_port:
tcpci_unregister_port(chip->tcpci);
@@ -499,6 +621,8 @@ static int max_tcpci_remove(struct i2c_client *client)
if (!IS_ERR_OR_NULL(chip->tcpci))
tcpci_unregister_port(chip->tcpci);
+ if (chip->chg_psy)
+ power_supply_put(chip->chg_psy);
return 0;
}
--
2.31.0.rc2.261.g7f71774620-goog
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