From 8be558dcffe69b078b34b1fa93b82acaf4ce4957 Mon Sep 17 00:00:00 2001
From: Frank Wang <frank.wang@rock-chips.com>
Date: Fri, 16 Jun 2023 15:52:41 +0800
Subject: [PATCH] usb: typec: tcpm: add get max power support
Git-commit: 8be558dcffe69b078b34b1fa93b82acaf4ce4957
References: jsc#PED-6054
Patch-mainline: v6.5-rc1
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>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
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 9f6aaa3e70ca..829d75ebab42 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -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;
--
2.43.0