drivers/platform/chrome/wilco_ec/sysfs.c

Source file repositories/reference/linux-study-clean/drivers/platform/chrome/wilco_ec/sysfs.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/chrome/wilco_ec/sysfs.c
Extension
.c
Size
5656 bytes
Lines
251
Domain
Driver Families
Bucket
drivers/platform
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 boot_on_ac_request {
	u8 cmd;			/* Always CMD_KB_CMOS */
	u8 reserved1;
	u8 sub_cmd;		/* Always SUB_CMD_KB_CMOS_AUTO_ON */
	u8 reserved3to5[3];
	u8 val;			/* Either 0 or 1 */
	u8 reserved7;
} __packed;

#define CMD_USB_CHARGE 0x39

enum usb_charge_op {
	USB_CHARGE_GET = 0,
	USB_CHARGE_SET = 1,
};

struct usb_charge_request {
	u8 cmd;		/* Always CMD_USB_CHARGE */
	u8 reserved;
	u8 op;		/* One of enum usb_charge_op */
	u8 val;		/* When setting, either 0 or 1 */
} __packed;

struct usb_charge_response {
	u8 reserved;
	u8 status;	/* Set by EC to 0 on success, other value on failure */
	u8 val;		/* When getting, set by EC to either 0 or 1 */
} __packed;

#define CMD_EC_INFO			0x38
enum get_ec_info_op {
	CMD_GET_EC_LABEL	= 0,
	CMD_GET_EC_REV		= 1,
	CMD_GET_EC_MODEL	= 2,
	CMD_GET_EC_BUILD_DATE	= 3,
};

struct get_ec_info_req {
	u8 cmd;			/* Always CMD_EC_INFO */
	u8 reserved;
	u8 op;			/* One of enum get_ec_info_op */
} __packed;

struct get_ec_info_resp {
	u8 reserved[2];
	char value[9]; /* __nonstring: might not be null terminated */
} __packed;

static ssize_t boot_on_ac_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct wilco_ec_device *ec = dev_get_drvdata(dev);
	struct boot_on_ac_request rq;
	struct wilco_ec_message msg;
	int ret;
	u8 val;

	ret = kstrtou8(buf, 10, &val);
	if (ret < 0)
		return ret;
	if (val > 1)
		return -EINVAL;

	memset(&rq, 0, sizeof(rq));
	rq.cmd = CMD_KB_CMOS;
	rq.sub_cmd = SUB_CMD_KB_CMOS_AUTO_ON;
	rq.val = val;

	memset(&msg, 0, sizeof(msg));
	msg.type = WILCO_EC_MSG_LEGACY;
	msg.request_data = &rq;
	msg.request_size = sizeof(rq);
	ret = wilco_ec_mailbox(ec, &msg);
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR_WO(boot_on_ac);

static ssize_t get_info(struct device *dev, char *buf, enum get_ec_info_op op)
{
	struct wilco_ec_device *ec = dev_get_drvdata(dev);
	struct get_ec_info_req req = { .cmd = CMD_EC_INFO, .op = op };
	struct get_ec_info_resp resp;
	int ret;

	struct wilco_ec_message msg = {

Annotation

Implementation Notes