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usb: typec: tps6598x: Export some power supply properties
This allows downstream supplies and userspace to detect whether external power is supplied. Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Guido Günther <agx@sigxcpu.org> Link: https://lore.kernel.org/r/2c8e81d9da9ff05b065f66edba915edd11f74065.1607166657.git.agx@sigxcpu.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 104 additions and 0 deletions
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@ -64,6 +64,7 @@ config TYPEC_HD3SS3220
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config TYPEC_TPS6598X
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tristate "TI TPS6598x USB Power Delivery controller driver"
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depends on I2C
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select POWER_SUPPLY
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select REGMAP_I2C
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select USB_ROLE_SWITCH
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help
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@ -9,6 +9,7 @@
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#include <linux/i2c.h>
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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#include <linux/interrupt.h>
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#include <linux/usb/typec.h>
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@ -55,6 +56,7 @@ enum {
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};
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/* TPS_REG_POWER_STATUS bits */
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#define TPS_POWER_STATUS_CONNECTION BIT(0)
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#define TPS_POWER_STATUS_SOURCESINK BIT(1)
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#define TPS_POWER_STATUS_PWROPMODE(p) (((p) & GENMASK(3, 2)) >> 2)
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@ -96,8 +98,25 @@ struct tps6598x {
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struct typec_partner *partner;
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struct usb_pd_identity partner_identity;
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struct usb_role_switch *role_sw;
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struct typec_capability typec_cap;
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struct power_supply *psy;
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struct power_supply_desc psy_desc;
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enum power_supply_usb_type usb_type;
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};
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static enum power_supply_property tps6598x_psy_props[] = {
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POWER_SUPPLY_PROP_USB_TYPE,
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POWER_SUPPLY_PROP_ONLINE,
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};
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static enum power_supply_usb_type tps6598x_psy_usb_types[] = {
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POWER_SUPPLY_USB_TYPE_C,
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POWER_SUPPLY_USB_TYPE_PD,
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};
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static const char *tps6598x_psy_name_prefix = "tps6598x-source-psy-";
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/*
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* Max data bytes for Data1, Data2, and other registers. See ch 1.3.2:
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* https://www.ti.com/lit/ug/slvuan1a/slvuan1a.pdf
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@ -248,6 +267,8 @@ static int tps6598x_connect(struct tps6598x *tps, u32 status)
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if (desc.identity)
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typec_partner_set_identity(tps->partner);
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power_supply_changed(tps->psy);
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return 0;
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}
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@ -260,6 +281,7 @@ static void tps6598x_disconnect(struct tps6598x *tps, u32 status)
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typec_set_pwr_role(tps->port, TPS_STATUS_PORTROLE(status));
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typec_set_vconn_role(tps->port, TPS_STATUS_VCONN(status));
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tps6598x_set_data_role(tps, TPS_STATUS_DATAROLE(status), false);
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power_supply_changed(tps->psy);
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}
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static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
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@ -467,6 +489,83 @@ static const struct regmap_config tps6598x_regmap_config = {
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.max_register = 0x7F,
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};
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static int tps6598x_psy_get_online(struct tps6598x *tps,
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union power_supply_propval *val)
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{
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int ret;
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u16 pwr_status;
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ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
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if (ret < 0)
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return ret;
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if ((pwr_status & TPS_POWER_STATUS_CONNECTION) &&
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(pwr_status & TPS_POWER_STATUS_SOURCESINK)) {
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val->intval = 1;
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} else {
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val->intval = 0;
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}
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return 0;
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}
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static int tps6598x_psy_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct tps6598x *tps = power_supply_get_drvdata(psy);
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u16 pwr_status;
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_USB_TYPE:
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ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
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if (ret < 0)
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return ret;
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if (TPS_POWER_STATUS_PWROPMODE(pwr_status) == TYPEC_PWR_MODE_PD)
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val->intval = POWER_SUPPLY_USB_TYPE_PD;
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else
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val->intval = POWER_SUPPLY_USB_TYPE_C;
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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ret = tps6598x_psy_get_online(tps, val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int devm_tps6598_psy_register(struct tps6598x *tps)
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{
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struct power_supply_config psy_cfg = {};
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const char *port_dev_name = dev_name(tps->dev);
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char *psy_name;
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psy_cfg.drv_data = tps;
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psy_cfg.fwnode = dev_fwnode(tps->dev);
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psy_name = devm_kasprintf(tps->dev, GFP_KERNEL, "%s%s", tps6598x_psy_name_prefix,
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port_dev_name);
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if (!psy_name)
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return -ENOMEM;
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tps->psy_desc.name = psy_name;
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tps->psy_desc.type = POWER_SUPPLY_TYPE_USB;
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tps->psy_desc.usb_types = tps6598x_psy_usb_types;
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tps->psy_desc.num_usb_types = ARRAY_SIZE(tps6598x_psy_usb_types);
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tps->psy_desc.properties = tps6598x_psy_props;
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tps->psy_desc.num_properties = ARRAY_SIZE(tps6598x_psy_props);
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tps->psy_desc.get_property = tps6598x_psy_get_prop;
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tps->usb_type = POWER_SUPPLY_USB_TYPE_C;
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tps->psy = devm_power_supply_register(tps->dev, &tps->psy_desc,
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&psy_cfg);
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return PTR_ERR_OR_ZERO(tps->psy);
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}
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static int tps6598x_probe(struct i2c_client *client)
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{
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struct typec_capability typec_cap = { };
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@ -560,6 +659,10 @@ static int tps6598x_probe(struct i2c_client *client)
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goto err_role_put;
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}
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ret = devm_tps6598_psy_register(tps);
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if (ret)
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return ret;
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tps->port = typec_register_port(&client->dev, &typec_cap);
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if (IS_ERR(tps->port)) {
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ret = PTR_ERR(tps->port);
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