Re: usb: typec: tcpm: add get max power support

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Hi Guenter,

On 2023/6/16 10:26, Guenter Roeck wrote:
On 6/15/23 19:21, Frank Wang wrote:
Traverse fixed pdos to calculate the maximum power that the charger
can provide, and it can be got by POWER_SUPPLY_PROP_INPUT_POWER_LIMIT
property.


Wasn't this already v3 before ? What happened to the version, and the change log ?
Or is this a completely different/new patch ?


Yes, it is the v3 patch before which has been hold for a long time, Gregkh asked me to rebase it  and resubmit, so should I also add an "RESEND" tag in subject?


BR.
Frank


Guenter

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 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;





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