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Subject[PATCH v4 2/2] usb: typec: tps6598x: Export some power supply properties
Date
This allows downstream supplies and userspace to detect
whether external power is supplied.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/usb/typec/Kconfig | 1 +
drivers/usb/typec/tps6598x.c | 105 +++++++++++++++++++++++++++++++++++
2 files changed, 106 insertions(+)

diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
index 772b07e9f188..365f905a8e49 100644
--- a/drivers/usb/typec/Kconfig
+++ b/drivers/usb/typec/Kconfig
@@ -64,6 +64,7 @@ config TYPEC_HD3SS3220
config TYPEC_TPS6598X
tristate "TI TPS6598x USB Power Delivery controller driver"
depends on I2C
+ select POWER_SUPPLY
select REGMAP_I2C
select USB_ROLE_SWITCH
help
diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
index 3db33bb622c3..d7fc2813b4ee 100644
--- a/drivers/usb/typec/tps6598x.c
+++ b/drivers/usb/typec/tps6598x.c
@@ -9,6 +9,7 @@
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/module.h>
+#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/interrupt.h>
#include <linux/usb/typec.h>
@@ -55,6 +56,7 @@ enum {
};

/* TPS_REG_POWER_STATUS bits */
+#define TPS_POWER_STATUS_CONNECTION BIT(0)
#define TPS_POWER_STATUS_SOURCESINK BIT(1)
#define TPS_POWER_STATUS_PWROPMODE(p) (((p) & GENMASK(3, 2)) >> 2)

@@ -96,8 +98,25 @@ struct tps6598x {
struct typec_partner *partner;
struct usb_pd_identity partner_identity;
struct usb_role_switch *role_sw;
+ struct typec_capability typec_cap;
+
+ struct power_supply *psy;
+ struct power_supply_desc psy_desc;
+ enum power_supply_usb_type usb_type;
+};
+
+static enum power_supply_property tps6598x_psy_props[] = {
+ POWER_SUPPLY_PROP_USB_TYPE,
+ POWER_SUPPLY_PROP_ONLINE,
};

+static enum power_supply_usb_type tps6598x_psy_usb_types[] = {
+ POWER_SUPPLY_USB_TYPE_C,
+ POWER_SUPPLY_USB_TYPE_PD,
+};
+
+static const char *tps6598x_psy_name_prefix = "tps6598x-source-psy-";
+
/*
* Max data bytes for Data1, Data2, and other registers. See ch 1.3.2:
* https://www.ti.com/lit/ug/slvuan1a/slvuan1a.pdf
@@ -248,6 +267,8 @@ static int tps6598x_connect(struct tps6598x *tps, u32 status)
if (desc.identity)
typec_partner_set_identity(tps->partner);

+ power_supply_changed(tps->psy);
+
return 0;
}

@@ -260,6 +281,7 @@ static void tps6598x_disconnect(struct tps6598x *tps, u32 status)
typec_set_pwr_role(tps->port, TPS_STATUS_PORTROLE(status));
typec_set_vconn_role(tps->port, TPS_STATUS_VCONN(status));
tps6598x_set_data_role(tps, TPS_STATUS_DATAROLE(status), false);
+ power_supply_changed(tps->psy);
}

static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
@@ -467,6 +489,85 @@ static const struct regmap_config tps6598x_regmap_config = {
.max_register = 0x7F,
};

+static int tps6598x_psy_get_online(struct tps6598x *tps,
+ union power_supply_propval *val)
+{
+ int ret;
+ u16 pwr_status;
+
+ ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
+ if (ret < 0)
+ return ret;
+
+ if ((pwr_status & TPS_POWER_STATUS_CONNECTION) &&
+ (pwr_status & TPS_POWER_STATUS_SOURCESINK)) {
+ val->intval = 1;
+ } else {
+ val->intval = 0;
+ }
+ return 0;
+}
+
+static int tps6598x_psy_get_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct tps6598x *tps = power_supply_get_drvdata(psy);
+ u16 pwr_status;
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_USB_TYPE:
+ ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
+ if (ret < 0)
+ return ret;
+ if (TPS_POWER_STATUS_PWROPMODE(pwr_status) == TYPEC_PWR_MODE_PD)
+ val->intval = POWER_SUPPLY_USB_TYPE_PD;
+ else
+ val->intval = POWER_SUPPLY_USB_TYPE_C;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ ret = tps6598x_psy_get_online(tps, val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int devm_tps6598_psy_register(struct tps6598x *tps)
+{
+ struct power_supply_config psy_cfg = {};
+ const char *port_dev_name = dev_name(tps->dev);
+ size_t psy_name_len = strlen(tps6598x_psy_name_prefix) +
+ strlen(port_dev_name) + 1;
+ char *psy_name;
+
+ psy_cfg.drv_data = tps;
+ psy_cfg.fwnode = dev_fwnode(tps->dev);
+ psy_name = devm_kzalloc(tps->dev, psy_name_len, GFP_KERNEL);
+ if (!psy_name)
+ return -ENOMEM;
+
+ snprintf(psy_name, psy_name_len, "%s%s", tps6598x_psy_name_prefix,
+ port_dev_name);
+ tps->psy_desc.name = psy_name;
+ tps->psy_desc.type = POWER_SUPPLY_TYPE_USB;
+ tps->psy_desc.usb_types = tps6598x_psy_usb_types;
+ tps->psy_desc.num_usb_types = ARRAY_SIZE(tps6598x_psy_usb_types);
+ tps->psy_desc.properties = tps6598x_psy_props;
+ tps->psy_desc.num_properties = ARRAY_SIZE(tps6598x_psy_props);
+ tps->psy_desc.get_property = tps6598x_psy_get_prop;
+
+ tps->usb_type = POWER_SUPPLY_USB_TYPE_C;
+
+ tps->psy = devm_power_supply_register(tps->dev, &tps->psy_desc,
+ &psy_cfg);
+ return PTR_ERR_OR_ZERO(tps->psy);
+}
+
static int tps6598x_probe(struct i2c_client *client)
{
struct typec_capability typec_cap = { };
@@ -560,6 +661,10 @@ static int tps6598x_probe(struct i2c_client *client)
goto err_role_put;
}

+ ret = devm_tps6598_psy_register(tps);
+ if (ret)
+ return ret;
+
tps->port = typec_register_port(&client->dev, &typec_cap);
if (IS_ERR(tps->port)) {
ret = PTR_ERR(tps->port);
--
2.29.2
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