drivers/power/supply/cros_peripheral_charger.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/cros_peripheral_charger.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/cros_peripheral_charger.c
Extension
.c
Size
9604 bytes
Lines
390
Domain
Driver Families
Bucket
drivers/power
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct port_data {
	int port_number;
	char name[PCHG_DIR_NAME_LENGTH];
	struct power_supply *psy;
	struct power_supply_desc psy_desc;
	int psy_status;
	int battery_percentage;
	int charge_type;
	struct charger_data *charger;
	unsigned long last_update;
};

struct charger_data {
	struct device *dev;
	struct cros_ec_dev *ec_dev;
	struct cros_ec_device *ec_device;
	int num_registered_psy;
	struct port_data *ports[EC_PCHG_MAX_PORTS];
	struct notifier_block notifier;
};

static enum power_supply_property cros_pchg_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_SCOPE,
};

static int cros_pchg_ec_command(const struct charger_data *charger,
				unsigned int version,
				unsigned int command,
				const void *outdata,
				unsigned int outsize,
				void *indata,
				unsigned int insize)
{
	struct cros_ec_dev *ec_dev = charger->ec_dev;
	struct cros_ec_command *msg;
	int ret;

	msg = kzalloc_flex(*msg, data, max(outsize, insize));
	if (!msg)
		return -ENOMEM;

	msg->version = version;
	msg->command = ec_dev->cmd_offset + command;
	msg->outsize = outsize;
	msg->insize = insize;

	if (outsize)
		memcpy(msg->data, outdata, outsize);

	ret = cros_ec_cmd_xfer_status(charger->ec_device, msg);
	if (ret >= 0 && insize)
		memcpy(indata, msg->data, insize);

	kfree(msg);
	return ret;
}

static const unsigned int pchg_cmd_version = 1;

static bool cros_pchg_cmd_ver_check(const struct charger_data *charger)
{
	struct ec_params_get_cmd_versions_v1 req;
	struct ec_response_get_cmd_versions rsp;
	int ret;

	req.cmd = EC_CMD_PCHG;
	ret = cros_pchg_ec_command(charger, 1, EC_CMD_GET_CMD_VERSIONS,
				   &req, sizeof(req), &rsp, sizeof(rsp));
	if (ret < 0) {
		dev_warn(charger->dev,
			 "Unable to get versions of EC_CMD_PCHG (err:%d)\n",
			 ret);
		return false;
	}

	return !!(rsp.version_mask & BIT(pchg_cmd_version));
}

static int cros_pchg_port_count(const struct charger_data *charger)
{
	struct ec_response_pchg_count rsp;
	int ret;

	ret = cros_pchg_ec_command(charger, 0, EC_CMD_PCHG_COUNT,
				   NULL, 0, &rsp, sizeof(rsp));
	if (ret < 0) {
		dev_warn(charger->dev,

Annotation

Implementation Notes