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/*
* ChromeOS EC multi-function device
*
* Copyright (C) 2012 Google, Inc
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __LINUX_MFD_CROS_EC_H
#define __LINUX_MFD_CROS_EC_H
#include <linux/mfd/cros_ec_commands.h>
/*
* Command interface between EC and AP, for LPC, I2C and SPI interfaces.
*/
enum {
EC_MSG_TX_HEADER_BYTES = 3,
EC_MSG_TX_TRAILER_BYTES = 1,
EC_MSG_TX_PROTO_BYTES = EC_MSG_TX_HEADER_BYTES +
EC_MSG_TX_TRAILER_BYTES,
EC_MSG_RX_PROTO_BYTES = 3,
/* Max length of messages */
EC_MSG_BYTES = EC_PROTO2_MAX_PARAM_SIZE +
EC_MSG_TX_PROTO_BYTES,
};
/**
* struct cros_ec_msg - A message sent to the EC, and its reply
*
* @version: Command version number (often 0)
* @cmd: Command to send (EC_CMD_...)
* @out_buf: Outgoing payload (to EC)
* @outlen: Outgoing length
* @in_buf: Incoming payload (from EC)
* @in_len: Incoming length
*/
struct cros_ec_msg {
u8 version;
u8 cmd;
uint8_t *out_buf;
int out_len;
uint8_t *in_buf;
int in_len;
};
/**
* struct cros_ec_device - Information about a ChromeOS EC device
*
* @name: Name of this EC interface
* @priv: Private data
* @irq: Interrupt to use
* @din: input buffer (from EC)
* @dout: output buffer (to EC)
* \note
* These two buffers will always be dword-aligned and include enough
* space for up to 7 word-alignment bytes also, so we can ensure that
* the body of the message is always dword-aligned (64-bit).
*
* We use this alignment to keep ARM and x86 happy. Probably word
* alignment would be OK, there might be a small performance advantage
* to using dword.
* @din_size: size of din buffer
* @dout_size: size of dout buffer
* @command_send: send a command
* @command_recv: receive a command
* @ec_name: name of EC device (e.g. 'chromeos-ec')
* @phys_name: name of physical comms layer (e.g. 'i2c-4')
* @parent: pointer to parent device (e.g. i2c or spi device)
* @dev: Device pointer
* dev_lock: Lock to prevent concurrent access
* @wake_enabled: true if this device can wake the system from sleep
* @was_wake_device: true if this device was set to wake the system from
* sleep at the last suspend
* @event_notifier: interrupt event notifier for transport devices
*/
struct cros_ec_device {
const char *name;
void *priv;
int irq;
uint8_t *din;
uint8_t *dout;
int din_size;
int dout_size;
int (*command_send)(struct cros_ec_device *ec,
uint16_t cmd, void *out_buf, int out_len);
int (*command_recv)(struct cros_ec_device *ec,
uint16_t cmd, void *in_buf, int in_len);
int (*command_sendrecv)(struct cros_ec_device *ec,
uint16_t cmd, void *out_buf, int out_len,
void *in_buf, int in_len);
int (*command_xfer)(struct cros_ec_device *ec,
struct cros_ec_msg *msg);
const char *ec_name;
const char *phys_name;
struct device *parent;
/* These are --private-- fields - do not assign */
struct device *dev;
struct mutex dev_lock;
bool wake_enabled;
bool was_wake_device;
struct blocking_notifier_head event_notifier;
};
/**
* cros_ec_suspend - Handle a suspend operation for the ChromeOS EC device
*
* This can be called by drivers to handle a suspend event.
*
* ec_dev: Device to suspend
* @return 0 if ok, -ve on error
*/
int cros_ec_suspend(struct cros_ec_device *ec_dev);
/**
* cros_ec_resume - Handle a resume operation for the ChromeOS EC device
*
* This can be called by drivers to handle a resume event.
*
* @ec_dev: Device to resume
* @return 0 if ok, -ve on error
*/
int cros_ec_resume(struct cros_ec_device *ec_dev);
/**
* cros_ec_prepare_tx - Prepare an outgoing message in the output buffer
*
* This is intended to be used by all ChromeOS EC drivers, but at present
* only SPI uses it. Once LPC uses the same protocol it can start using it.
* I2C could use it now, with a refactor of the existing code.
*
* @ec_dev: Device to register
* @msg: Message to write
*/
int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
struct cros_ec_msg *msg);
/**
* cros_ec_remove - Remove a ChromeOS EC
*
* Call this to deregister a ChromeOS EC. After this you should call
* cros_ec_free().
*
* @ec_dev: Device to register
* @return 0 if ok, -ve on error
*/
int cros_ec_remove(struct cros_ec_device *ec_dev);
/**
* cros_ec_register - Register a new ChromeOS EC, using the provided info
*
* Before calling this, allocate a pointer to a new device and then fill
* in all the fields up to the --private-- marker.
*
* @ec_dev: Device to register
* @return 0 if ok, -ve on error
*/
int cros_ec_register(struct cros_ec_device *ec_dev);
#endif /* __LINUX_MFD_CROS_EC_H */
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