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cros_ec: Allow reading the battery-charge state

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Add a function to read this information from the EC. It is useful for
determining whether the battery has enough charge to boot.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-07-05 16:32:49 -06:00
parent ecc1ed912e
commit 201efb2bb0
2 changed files with 25 additions and 0 deletions
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17
drivers/misc/cros_ec.c
View file

@ -1661,6 +1661,23 @@ int cros_ec_get_switches(struct udevice *dev)
return ret;
}
int cros_ec_read_batt_charge(struct udevice *dev, uint *chargep)
{
struct ec_params_charge_state req;
struct ec_response_charge_state resp;
int ret;
req.cmd = CHARGE_STATE_CMD_GET_STATE;
ret = ec_command(dev, EC_CMD_CHARGE_STATE, 0, &req, sizeof(req),
&resp, sizeof(resp));
if (ret)
return log_msg_ret("read", ret);
*chargep = resp.get_state.batt_state_of_charge;
return 0;
}
UCLASS_DRIVER(cros_ec) = {
.id = UCLASS_CROS_EC,
.name = "cros-ec",

8
include/cros_ec.h
View file

@ -652,4 +652,12 @@ int cros_ec_vstore_read(struct udevice *dev, int slot, uint8_t *data);
int cros_ec_vstore_write(struct udevice *dev, int slot, const uint8_t *data,
size_t size);
/**
* cros_ec_read_batt_charge() - Read the battery-charge state
*
* @dev: CROS-EC device
* @chargep: Return battery-charge state as a percentage
*/
int cros_ec_read_batt_charge(struct udevice *dev, uint *chargep);
#endif