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usb: typec: tcpm: add get max power support 

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@rock-chips.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230616075241.27690-2-frank.wang@rock-chips.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frank Wang 2023-06-16 15:52:41 +08:00 committed by Greg Kroah-Hartman
parent 1e35f07439
commit 8be558dcff
1 changed files with 24 additions and 0 deletions
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24
drivers/usb/typec/tcpm/tcpm.c
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@ -6340,6 +6340,27 @@ 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_uw = 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;
max_src_uw = tmp > max_src_uw ? tmp : max_src_uw;
}
}
val->intval = max_src_uw;
return 0;
}
static int tcpm_psy_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
@ -6369,6 +6390,9 @@ 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;