Hi,
On Mon, Mar 20, 2023 at 06:07:11PM +0800, Frank Wang wrote:
> Traverse fixed pdos to calculate the maximum power that the charger
> can provide, and it can be get by POWER_SUPPLY_PROP_INPUT_POWER_LIMIT
> property.
>
> Signed-off-by: Frank Wang <frank.wang@xxxxxxxxxxxxxx>
> ---
> drivers/usb/typec/tcpm/tcpm.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 13830b5e2d09f..d6ad3cdf9e4af 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -6320,6 +6320,27 @@ static int tcpm_psy_get_current_now(struct tcpm_port *port,
> return 0;
> }
>
> +static int tcpm_psy_get_input_power_limit(struct tcpm_port *port,
> + union power_supply_propval *val)
> +{
> + unsigned int src_mv, src_ma, max_src_mw = 0;
> + unsigned int i, tmp;
> +
> + for (i = 0; i < port->nr_source_caps; i++) {
> + u32 pdo = port->source_caps[i];
> +
> + if (pdo_type(pdo) == PDO_TYPE_FIXED) {
> + src_mv = pdo_fixed_voltage(pdo);
> + src_ma = pdo_max_current(pdo);
> + tmp = src_mv * src_ma / 1000;
> + max_src_mw = tmp > max_src_mw ? tmp : max_src_mw;
> + }
> + }
> +
> + val->intval = max_src_mw;
The power-supply subsystem expects Microwatts and not Milliwatts.
-- Sebastian
> + return 0;
> +}
> +
> static int tcpm_psy_get_prop(struct power_supply *psy,
> enum power_supply_property psp,
> union power_supply_propval *val)
> @@ -6349,6 +6370,9 @@ static int tcpm_psy_get_prop(struct power_supply *psy,
> case POWER_SUPPLY_PROP_CURRENT_NOW:
> ret = tcpm_psy_get_current_now(port, val);
> break;
> + case POWER_SUPPLY_PROP_INPUT_POWER_LIMIT:
> + tcpm_psy_get_input_power_limit(port, val);
> + break;
> default:
> ret = -EINVAL;
> break;
> --
> 2.17.1
>
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