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chromeec: Add function to retrieve usb c charger info 

Add google_chromeec_get_usb_pd_power_info(), which will
call the EC_CMD_USB_PD_POWER_INFO host command to retrieve
the current and voltage info of the usb c charger.
Returns power info in watts.

BUG=b:37473486
BRANCH=None
TEST=output debug info to make sure that correct power
     is returned.

Change-Id: Ie14a0a6163e1c2699cb20b4422c8062164d92076
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://review.coreboot.org/21771
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Shelley Chen 2017-09-29 14:15:11 -07:00 committed by Aaron Durbin
parent bd885c5bac
commit ebd533065f
2 changed files with 38 additions and 0 deletions
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29
src/ec/google/chromeec/ec.c
View File

@ -609,6 +609,35 @@ int google_chromeec_set_usb_charge_mode(u8 port_id, enum usb_charge_mode mode)
return google_chromeec_command(&cmd);
}
/* Get charger power info in Watts. Also returns type of charger */
int google_chromeec_get_usb_pd_power_info(enum usb_chg_type *type,
u32 *max_watts)
{
struct ec_params_usb_pd_power_info req = {
.port = PD_POWER_CHARGING_PORT,
};
struct ec_response_usb_pd_power_info rsp;
struct chromeec_command cmd = {
.cmd_code = EC_CMD_USB_PD_POWER_INFO,
.cmd_version = 0,
.cmd_data_in = &req,
.cmd_size_in = sizeof(req),
.cmd_data_out = &rsp,
.cmd_size_out = sizeof(rsp),
.cmd_dev_index = 0,
};
struct usb_chg_measures m;
int rv = google_chromeec_command(&cmd);
if (rv != 0)
return rv;
/* values are given in milliAmps and milliVolts */
*type = rsp.type;
m = rsp.meas;
*max_watts = (m.current_max * m.voltage_max) / 1000000;
return 0;
}
int google_chromeec_set_usb_pd_role(u8 port, enum usb_pd_control_role role)
{
struct ec_params_usb_pd_control req = {

9
src/ec/google/chromeec/ec.h
View File

@ -81,6 +81,15 @@ enum usb_charge_mode {
};
int google_chromeec_set_usb_charge_mode(u8 port_id, enum usb_charge_mode mode);
int google_chromeec_set_usb_pd_role(u8 port, enum usb_pd_control_role role);
/*
* Retrieve the charger type and max wattage.
*
* @param type charger type
* @param max_watts charger max wattage
* @return non-zero for error, otherwise 0.
*/
int google_chromeec_get_usb_pd_power_info(enum usb_chg_type *type,
u32 *max_watts);
/* internal structure to send a command to the EC and wait for response. */
struct chromeec_command {