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cros_ec: Add documentation for cros_ec driver operations

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Add comments to these methods so it is documented in this central place,
not just in each driver.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-01-16 14:52:27 -07:00
parent 8aec32f6ab
commit 2b4b653391
1 changed files with 40 additions and 0 deletions
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40
include/cros_ec.h
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@ -234,10 +234,50 @@ int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image,
struct udevice *board_get_cros_ec_dev(void);
struct dm_cros_ec_ops {
/**
* check_version() - Check the protocol version being used (optional)
*
* If provided, this function should check that the EC can be supported
* by the driver. If not provided, HELLO messages will be sent to try
* to determine the protocol version.
*
* @dev: Device to check
* @return 0 if the protocol is valid, -ve if not supported
*/
int (*check_version)(struct udevice *dev);
/**
* command() - Old-style command interface
*
* This sends a command and receives a response (deprecated, use
* packet())
*
* @dev: Device to use
* @cmd: Command to send (only supports 0-0xff)
* @cmd_version: Version of command to send (often 0)
* @dout: Output data (may be NULL If dout_len=0)
* @dout_len: Length of output data excluding 4-byte header
* @dinp: On input, set to point to input data, often struct
* cros_ec_dev->din - typically this is left alone but may be
* updated by the driver
* @din_len: Maximum length of response
* @return number of bytes in response, or -ve on error
*/
int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
const uint8_t *dout, int dout_len,
uint8_t **dinp, int din_len);
/**
* packet() - New-style command interface
*
* This interface is preferred over command(), since it is typically
* easier to implement.
*
* @dev: Device to use
* @out_bytes: Number of bytes to send (from struct cros_ec_dev->dout)
* @in_bytes: Maximum number of bytes to expect in response
* @return number of bytes in response, or -ve on error
*/
int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
};