336 lines
10 KiB
C
336 lines
10 KiB
C
/*
|
|
* 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/cdev.h>
|
|
#include <linux/device.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/mfd/cros_ec_commands.h>
|
|
#include <linux/mutex.h>
|
|
|
|
#define CROS_EC_DEV_NAME "cros_ec"
|
|
#define CROS_EC_DEV_PD_NAME "cros_pd"
|
|
|
|
/*
|
|
* The EC is unresponsive for a time after a reboot command. Add a
|
|
* simple delay to make sure that the bus stays locked.
|
|
*/
|
|
#define EC_REBOOT_DELAY_MS 50
|
|
|
|
/*
|
|
* Max bus-specific overhead incurred by request/responses.
|
|
* I2C requires 1 additional byte for requests.
|
|
* I2C requires 2 additional bytes for responses.
|
|
* SPI requires up to 32 additional bytes for responses.
|
|
* */
|
|
#define EC_PROTO_VERSION_UNKNOWN 0
|
|
#define EC_MAX_REQUEST_OVERHEAD 1
|
|
#define EC_MAX_RESPONSE_OVERHEAD 32
|
|
|
|
/*
|
|
* 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 for proto 2*/
|
|
EC_PROTO2_MSG_BYTES = EC_PROTO2_MAX_PARAM_SIZE +
|
|
EC_MSG_TX_PROTO_BYTES,
|
|
|
|
EC_MAX_MSG_BYTES = 64 * 1024,
|
|
};
|
|
|
|
/*
|
|
* @version: Command version number (often 0)
|
|
* @command: Command to send (EC_CMD_...)
|
|
* @outsize: Outgoing length in bytes
|
|
* @insize: Max number of bytes to accept from EC
|
|
* @result: EC's response to the command (separate from communication failure)
|
|
* @data: Where to put the incoming data from EC and outgoing data to EC
|
|
*/
|
|
struct cros_ec_command {
|
|
uint32_t version;
|
|
uint32_t command;
|
|
uint32_t outsize;
|
|
uint32_t insize;
|
|
uint32_t result;
|
|
uint8_t data[0];
|
|
};
|
|
|
|
/**
|
|
* struct cros_ec_device - Information about a ChromeOS EC device
|
|
*
|
|
* @phys_name: name of physical comms layer (e.g. 'i2c-4')
|
|
* @dev: Device pointer for physical comms device
|
|
* @was_wake_device: true if this device was set to wake the system from
|
|
* sleep at the last suspend
|
|
* @cmd_readmem: direct read of the EC memory-mapped region, if supported
|
|
* @offset is within EC_LPC_ADDR_MEMMAP region.
|
|
* @bytes: number of bytes to read. zero means "read a string" (including
|
|
* the trailing '\0'). At most only EC_MEMMAP_SIZE bytes can be read.
|
|
* Caller must ensure that the buffer is large enough for the result when
|
|
* reading a string.
|
|
*
|
|
* @priv: Private data
|
|
* @irq: Interrupt to use
|
|
* @id: Device id
|
|
* @din: input buffer (for data from EC)
|
|
* @dout: output buffer (for data 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 to allocate (zero to use static din)
|
|
* @dout_size: size of dout buffer to allocate (zero to use static dout)
|
|
* @wake_enabled: true if this device can wake the system from sleep
|
|
* @suspended: true if this device had been suspended
|
|
* @cmd_xfer: send command to EC and get response
|
|
* Returns the number of bytes received if the communication succeeded, but
|
|
* that doesn't mean the EC was happy with the command. The caller
|
|
* should check msg.result for the EC's result code.
|
|
* @pkt_xfer: send packet to EC and get response
|
|
* @lock: one transaction at a time
|
|
* @mkbp_event_supported: true if this EC supports the MKBP event protocol.
|
|
* @event_notifier: interrupt event notifier for transport devices.
|
|
* @event_data: raw payload transferred with the MKBP event.
|
|
* @event_size: size in bytes of the event data.
|
|
*/
|
|
struct cros_ec_device {
|
|
|
|
/* These are used by other drivers that want to talk to the EC */
|
|
const char *phys_name;
|
|
struct device *dev;
|
|
bool was_wake_device;
|
|
struct class *cros_class;
|
|
int (*cmd_readmem)(struct cros_ec_device *ec, unsigned int offset,
|
|
unsigned int bytes, void *dest);
|
|
|
|
/* These are used to implement the platform-specific interface */
|
|
u16 max_request;
|
|
u16 max_response;
|
|
u16 max_passthru;
|
|
u16 proto_version;
|
|
void *priv;
|
|
int irq;
|
|
u8 *din;
|
|
u8 *dout;
|
|
int din_size;
|
|
int dout_size;
|
|
bool wake_enabled;
|
|
bool suspended;
|
|
int (*cmd_xfer)(struct cros_ec_device *ec,
|
|
struct cros_ec_command *msg);
|
|
int (*pkt_xfer)(struct cros_ec_device *ec,
|
|
struct cros_ec_command *msg);
|
|
struct mutex lock;
|
|
bool mkbp_event_supported;
|
|
struct blocking_notifier_head event_notifier;
|
|
|
|
struct ec_response_get_next_event_v1 event_data;
|
|
int event_size;
|
|
u32 host_event_wake_mask;
|
|
};
|
|
|
|
/**
|
|
* struct cros_ec_sensor_platform - ChromeOS EC sensor platform information
|
|
*
|
|
* @sensor_num: Id of the sensor, as reported by the EC.
|
|
*/
|
|
struct cros_ec_sensor_platform {
|
|
u8 sensor_num;
|
|
};
|
|
|
|
/* struct cros_ec_platform - ChromeOS EC platform information
|
|
*
|
|
* @ec_name: name of EC device (e.g. 'cros-ec', 'cros-pd', ...)
|
|
* used in /dev/ and sysfs.
|
|
* @cmd_offset: offset to apply for each command. Set when
|
|
* registering a devicde behind another one.
|
|
*/
|
|
struct cros_ec_platform {
|
|
const char *ec_name;
|
|
u16 cmd_offset;
|
|
};
|
|
|
|
struct cros_ec_debugfs;
|
|
|
|
/*
|
|
* struct cros_ec_dev - ChromeOS EC device entry point
|
|
*
|
|
* @class_dev: Device structure used in sysfs
|
|
* @cdev: Character device structure in /dev
|
|
* @ec_dev: cros_ec_device structure to talk to the physical device
|
|
* @dev: pointer to the platform device
|
|
* @debug_info: cros_ec_debugfs structure for debugging information
|
|
* @has_kb_wake_angle: true if at least 2 accelerometer are connected to the EC.
|
|
* @cmd_offset: offset to apply for each command.
|
|
*/
|
|
struct cros_ec_dev {
|
|
struct device class_dev;
|
|
struct cdev cdev;
|
|
struct cros_ec_device *ec_dev;
|
|
struct device *dev;
|
|
struct cros_ec_debugfs *debug_info;
|
|
bool has_kb_wake_angle;
|
|
u16 cmd_offset;
|
|
u32 features[2];
|
|
};
|
|
|
|
#define to_cros_ec_dev(dev) container_of(dev, struct cros_ec_dev, class_dev)
|
|
|
|
/**
|
|
* 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_command *msg);
|
|
|
|
/**
|
|
* cros_ec_check_result - Check ec_msg->result
|
|
*
|
|
* This is used by ChromeOS EC drivers to check the ec_msg->result for
|
|
* errors and to warn about them.
|
|
*
|
|
* @ec_dev: EC device
|
|
* @msg: Message to check
|
|
*/
|
|
int cros_ec_check_result(struct cros_ec_device *ec_dev,
|
|
struct cros_ec_command *msg);
|
|
|
|
/**
|
|
* cros_ec_cmd_xfer - Send a command to the ChromeOS EC
|
|
*
|
|
* Call this to send a command to the ChromeOS EC. This should be used
|
|
* instead of calling the EC's cmd_xfer() callback directly.
|
|
*
|
|
* @ec_dev: EC device
|
|
* @msg: Message to write
|
|
*/
|
|
int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
|
|
struct cros_ec_command *msg);
|
|
|
|
/**
|
|
* cros_ec_cmd_xfer_status - Send a command to the ChromeOS EC
|
|
*
|
|
* This function is identical to cros_ec_cmd_xfer, except it returns success
|
|
* status only if both the command was transmitted successfully and the EC
|
|
* replied with success status. It's not necessary to check msg->result when
|
|
* using this function.
|
|
*
|
|
* @ec_dev: EC device
|
|
* @msg: Message to write
|
|
* @return: Num. of bytes transferred on success, <0 on failure
|
|
*/
|
|
int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
|
|
struct cros_ec_command *msg);
|
|
|
|
/**
|
|
* cros_ec_remove - Remove a ChromeOS EC
|
|
*
|
|
* Call this to deregister a ChromeOS EC, then clean up any private data.
|
|
*
|
|
* @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);
|
|
|
|
/**
|
|
* cros_ec_query_all - Query the protocol version supported by the ChromeOS EC
|
|
*
|
|
* @ec_dev: Device to register
|
|
* @return 0 if ok, -ve on error
|
|
*/
|
|
int cros_ec_query_all(struct cros_ec_device *ec_dev);
|
|
|
|
/**
|
|
* cros_ec_get_next_event - Fetch next event from the ChromeOS EC
|
|
*
|
|
* @ec_dev: Device to fetch event from
|
|
* @wake_event: Pointer to a bool set to true upon return if the event might be
|
|
* treated as a wake event. Ignored if null.
|
|
*
|
|
* Returns: 0 on success, Linux error number on failure
|
|
*/
|
|
int cros_ec_get_next_event(struct cros_ec_device *ec_dev, bool *wake_event);
|
|
|
|
/**
|
|
* cros_ec_get_host_event - Return a mask of event set by the EC.
|
|
*
|
|
* When MKBP is supported, when the EC raises an interrupt,
|
|
* We collect the events raised and call the functions in the ec notifier.
|
|
*
|
|
* This function is a helper to know which events are raised.
|
|
*/
|
|
u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev);
|
|
|
|
/* sysfs stuff */
|
|
extern struct attribute_group cros_ec_attr_group;
|
|
extern struct attribute_group cros_ec_lightbar_attr_group;
|
|
extern struct attribute_group cros_ec_vbc_attr_group;
|
|
|
|
/* debugfs stuff */
|
|
int cros_ec_debugfs_init(struct cros_ec_dev *ec);
|
|
void cros_ec_debugfs_remove(struct cros_ec_dev *ec);
|
|
void cros_ec_debugfs_suspend(struct cros_ec_dev *ec);
|
|
void cros_ec_debugfs_resume(struct cros_ec_dev *ec);
|
|
|
|
#endif /* __LINUX_MFD_CROS_EC_H */
|