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Message-ID: <20201130102942.GB2911464@kuha.fi.intel.com>
Date: Mon, 30 Nov 2020 12:29:42 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Guido Günther <agx@...xcpu.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] usb: typec: tps6598x: Export some power supply
properties
On Fri, Nov 27, 2020 at 01:53:29PM +0100, Guido Günther wrote:
> This allows downstream supplies and userspace to detect
> whether external power is supplied.
>
> Signed-off-by: Guido Günther <agx@...xcpu.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.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..8163306f849e 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 = 0;
> + } else {
> + val->intval = 1;
> + }
> + 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
thanks,
--
heikki
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