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Message-Id: <20230616075241.27690-2-frank.wang@rock-chips.com>
Date: Fri, 16 Jun 2023 15:52:41 +0800
From: Frank Wang <frank.wang@...k-chips.com>
To: linux@...ck-us.net, heikki.krogerus@...ux.intel.com,
gregkh@...uxfoundation.org, sebastian.reichel@...labora.com,
heiko@...ech.de
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-rockchip@...ts.infradead.org, huangtao@...k-chips.com,
william.wu@...k-chips.com, jianwei.zheng@...k-chips.com,
yubing.zhang@...k-chips.com, wmc@...k-chips.com,
Frank Wang <frank.wang@...k-chips.com>
Subject: [v4,2/2] 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@...k-chips.com>
---
Changelog:
v4:
- No change
v3:
- Use Microwatts instead of Milliwatts to follow the ABI, commented by Sebastian Reichel.
v2:
- No change
v1:
- https://patchwork.kernel.org/project/linux-usb/patch/20230313025843.17162-4-frank.wang@rock-chips.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 9f6aaa3e70ca8..829d75ebab422 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;
--
2.17.1
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