diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/Kbuild | 2 | ||||
| -rw-r--r-- | include/linux/iio/common/cros_ec_sensors_core.h | 3 | ||||
| -rw-r--r-- | include/linux/mfd/cros_ec.h | 308 | ||||
| -rw-r--r-- | include/linux/platform_data/cros_ec_chardev.h | 2 | ||||
| -rw-r--r-- | include/linux/platform_data/cros_ec_commands.h (renamed from include/linux/mfd/cros_ec_commands.h) | 0 | ||||
| -rw-r--r-- | include/linux/platform_data/cros_ec_proto.h | 319 |
6 files changed, 323 insertions, 311 deletions
diff --git a/include/Kbuild b/include/Kbuild index c38f0d46b267..b30824615814 100644 --- a/include/Kbuild +++ b/include/Kbuild @@ -310,7 +310,6 @@ header-test- += linux/mfd/adp5520.h header-test- += linux/mfd/arizona/pdata.h header-test- += linux/mfd/as3711.h header-test- += linux/mfd/as3722.h -header-test- += linux/mfd/cros_ec_commands.h header-test- += linux/mfd/da903x.h header-test- += linux/mfd/da9055/pdata.h header-test- += linux/mfd/da9063/pdata.h @@ -480,6 +479,7 @@ header-test- += linux/platform_data/ata-pxa.h header-test- += linux/platform_data/atmel.h header-test- += linux/platform_data/bh1770glc.h header-test- += linux/platform_data/brcmfmac.h +header-test- += linux/platform_data/cros_ec_commands.h header-test- += linux/platform_data/clk-u300.h header-test- += linux/platform_data/cyttsp4.h header-test- += linux/platform_data/dma-coh901318.h diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h index 0c636b9fe8d7..77a7d65746b6 100644 --- a/include/linux/iio/common/cros_ec_sensors_core.h +++ b/include/linux/iio/common/cros_ec_sensors_core.h @@ -10,7 +10,8 @@ #include <linux/iio/iio.h> #include <linux/irqreturn.h> -#include <linux/mfd/cros_ec.h> +#include <linux/platform_data/cros_ec_commands.h> +#include <linux/platform_data/cros_ec_proto.h> enum { CROS_EC_SENSOR_X, diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h index 569428ad1cb1..61c2875c2a40 100644 --- a/include/linux/mfd/cros_ec.h +++ b/include/linux/mfd/cros_ec.h @@ -8,186 +8,7 @@ #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_FP_NAME "cros_fp" -#define CROS_EC_DEV_PD_NAME "cros_pd" -#define CROS_EC_DEV_TP_NAME "cros_tp" -#define CROS_EC_DEV_ISH_NAME "cros_ish" -#define CROS_EC_DEV_SCP_NAME "cros_scp" - -/* - * 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, -}; - -/** - * struct cros_ec_command - Information about a ChromeOS EC command. - * @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 the 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. - * @cros_class: The class structure for this device. - * @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. - * @max_request: Max size of message requested. - * @max_response: Max size of message response. - * @max_passthru: Max sice of passthru message. - * @proto_version: The protocol version used for this device. - * @priv: Private data. - * @irq: Interrupt to use. - * @id: Device id. - * @din: Input buffer (for data from EC). This buffer 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. - * @dout: Output buffer (for data to EC). This buffer 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. - * @host_sleep_v1: True if this EC supports the sleep v1 command. - * @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. - * @host_event_wake_mask: Mask of host events that cause wake from suspend. - * @ec: The platform_device used by the mfd driver to interface with the - * main EC. - * @pd: The platform_device used by the mfd driver to interface with the - * PD behind an EC. - */ -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; - bool host_sleep_v1; - struct blocking_notifier_head event_notifier; - - struct ec_response_get_next_event_v1 event_data; - int event_size; - u32 host_event_wake_mask; - u32 last_resume_result; - - /* The platform devices used by the mfd driver */ - struct platform_device *ec; - struct platform_device *pd; -}; - -/** - * 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 device 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. @@ -211,133 +32,4 @@ struct cros_ec_dev { #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. - * @ec_dev: Device to suspend. - * - * This can be called by drivers to handle a suspend event. - * - * Return: 0 on success or negative error code. - */ -int cros_ec_suspend(struct cros_ec_device *ec_dev); - -/** - * cros_ec_resume() - Handle a resume operation for the ChromeOS EC device. - * @ec_dev: Device to resume. - * - * This can be called by drivers to handle a resume event. - * - * Return: 0 on success or negative error code. - */ -int cros_ec_resume(struct cros_ec_device *ec_dev); - -/** - * cros_ec_prepare_tx() - Prepare an outgoing message in the output buffer. - * @ec_dev: Device to register. - * @msg: Message to write. - * - * 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. - * - * Return: 0 on success or negative error code. - */ -int cros_ec_prepare_tx(struct cros_ec_device *ec_dev, - struct cros_ec_command *msg); - -/** - * cros_ec_check_result() - Check ec_msg->result. - * @ec_dev: EC device. - * @msg: Message to check. - * - * This is used by ChromeOS EC drivers to check the ec_msg->result for - * errors and to warn about them. - * - * Return: 0 on success or negative error code. - */ -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. - * @ec_dev: EC device. - * @msg: Message to write. - * - * Call this to send a command to the ChromeOS EC. This should be used - * instead of calling the EC's cmd_xfer() callback directly. - * - * Return: 0 on success or negative error code. - */ -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. - * @ec_dev: EC device. - * @msg: Message to write. - * - * 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. - * - * Return: The number of bytes transferred on success or negative error code. - */ -int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, - struct cros_ec_command *msg); - -/** - * cros_ec_register() - Register a new ChromeOS EC, using the provided info. - * @ec_dev: Device to register. - * - * Before calling this, allocate a pointer to a new device and then fill - * in all the fields up to the --private-- marker. - * - * Return: 0 on success or negative error code. - */ -int cros_ec_register(struct cros_ec_device *ec_dev); - -/** - * cros_ec_unregister() - Remove a ChromeOS EC. - * @ec_dev: Device to unregister. - * - * Call this to deregister a ChromeOS EC, then clean up any private data. - * - * Return: 0 on success or negative error code. - */ -int cros_ec_unregister(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 on success or negative error code. - */ -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. - * - * Return: negative error code on errors; 0 for no data; or else number of - * bytes received (i.e., an event was retrieved successfully). Event types are - * written out to @ec_dev->event_data.event_type on success. - */ -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 ChromeOS EC. - * @ec_dev: Device to fetch event from. - * - * 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. - * - * Return: 0 on error or non-zero bitmask of one or more EC_HOST_EVENT_*. - */ -u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev); - #endif /* __LINUX_MFD_CROS_EC_H */ diff --git a/include/linux/platform_data/cros_ec_chardev.h b/include/linux/platform_data/cros_ec_chardev.h index 6600b54f531c..973b2615aa02 100644 --- a/include/linux/platform_data/cros_ec_chardev.h +++ b/include/linux/platform_data/cros_ec_chardev.h @@ -12,7 +12,7 @@ #include <linux/ioctl.h> #include <linux/types.h> -#include <linux/mfd/cros_ec.h> +#include <linux/platform_data/cros_ec_commands.h> #define CROS_EC_DEV_VERSION "1.0.0" diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 7ccb8757b79d..7ccb8757b79d 100644 --- a/include/linux/mfd/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h diff --git a/include/linux/platform_data/cros_ec_proto.h b/include/linux/platform_data/cros_ec_proto.h new file mode 100644 index 000000000000..eab7036cda09 --- /dev/null +++ b/include/linux/platform_data/cros_ec_proto.h @@ -0,0 +1,319 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * ChromeOS Embedded Controller protocol interface. + * + * Copyright (C) 2012 Google, Inc + */ + +#ifndef __LINUX_CROS_EC_PROTO_H +#define __LINUX_CROS_EC_PROTO_H + +#include <linux/device.h> +#include <linux/mutex.h> +#include <linux/notifier.h> + +#include <linux/platform_data/cros_ec_commands.h> + +#define CROS_EC_DEV_NAME "cros_ec" +#define CROS_EC_DEV_FP_NAME "cros_fp" +#define CROS_EC_DEV_ISH_NAME "cros_ish" +#define CROS_EC_DEV_PD_NAME "cros_pd" +#define CROS_EC_DEV_SCP_NAME "cros_scp" +#define CROS_EC_DEV_TP_NAME "cros_tp" + +/* + * 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, +}; + +/** + * struct cros_ec_command - Information about a ChromeOS EC command. + * @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 the 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. + * @cros_class: The class structure for this device. + * @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. + * @max_request: Max size of message requested. + * @max_response: Max size of message response. + * @max_passthru: Max sice of passthru message. + * @proto_version: The protocol version used for this device. + * @priv: Private data. + * @irq: Interrupt to use. + * @id: Device id. + * @din: Input buffer (for data from EC). This buffer 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. + * @dout: Output buffer (for data to EC). This buffer 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. + * @host_sleep_v1: True if this EC supports the sleep v1 command. + * @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. + * @host_event_wake_mask: Mask of host events that cause wake from suspend. + * @ec: The platform_device used by the mfd driver to interface with the + * main EC. + * @pd: The platform_device used by the mfd driver to interface with the + * PD behind an EC. + */ +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; + bool host_sleep_v1; + struct blocking_notifier_head event_notifier; + + struct ec_response_get_next_event_v1 event_data; + int event_size; + u32 host_event_wake_mask; + u32 last_resume_result; + + /* The platform devices used by the mfd driver */ + struct platform_device *ec; + struct platform_device *pd; +}; + +/** + * 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 device behind another one. + */ +struct cros_ec_platform { + const char *ec_name; + u16 cmd_offset; +}; + +/** + * cros_ec_suspend() - Handle a suspend operation for the ChromeOS EC device. + * @ec_dev: Device to suspend. + * + * This can be called by drivers to handle a suspend event. + * + * Return: 0 on success or negative error code. + */ +int cros_ec_suspend(struct cros_ec_device *ec_dev); + +/** + * cros_ec_resume() - Handle a resume operation for the ChromeOS EC device. + * @ec_dev: Device to resume. + * + * This can be called by drivers to handle a resume event. + * + * Return: 0 on success or negative error code. + */ +int cros_ec_resume(struct cros_ec_device *ec_dev); + +/** + * cros_ec_prepare_tx() - Prepare an outgoing message in the output buffer. + * @ec_dev: Device to register. + * @msg: Message to write. + * + * 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. + * + * Return: 0 on success or negative error code. + */ +int cros_ec_prepare_tx(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg); + +/** + * cros_ec_check_result() - Check ec_msg->result. + * @ec_dev: EC device. + * @msg: Message to check. + * + * This is used by ChromeOS EC drivers to check the ec_msg->result for + * errors and to warn about them. + * + * Return: 0 on success or negative error code. + */ +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. + * @ec_dev: EC device. + * @msg: Message to write. + * + * Call this to send a command to the ChromeOS EC. This should be used + * instead of calling the EC's cmd_xfer() callback directly. + * + * Return: 0 on success or negative error code. + */ +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. + * @ec_dev: EC device. + * @msg: Message to write. + * + * 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. + * + * Return: The number of bytes transferred on success or negative error code. + */ +int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg); + +/** + * cros_ec_register() - Register a new ChromeOS EC, using the provided info. + * @ec_dev: Device to register. + * + * Before calling this, allocate a pointer to a new device and then fill + * in all the fields up to the --private-- marker. + * + * Return: 0 on success or negative error code. + */ +int cros_ec_register(struct cros_ec_device *ec_dev); + +/** + * cros_ec_unregister() - Remove a ChromeOS EC. + * @ec_dev: Device to unregister. + * + * Call this to deregister a ChromeOS EC, then clean up any private data. + * + * Return: 0 on success or negative error code. + */ +int cros_ec_unregister(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 on success or negative error code. + */ +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. + * + * Return: negative error code on errors; 0 for no data; or else number of + * bytes received (i.e., an event was retrieved successfully). Event types are + * written out to @ec_dev->event_data.event_type on success. + */ +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 ChromeOS EC. + * @ec_dev: Device to fetch event from. + * + * 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. + * + * Return: 0 on error or non-zero bitmask of one or more EC_HOST_EVENT_*. + */ +u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev); + +#endif /* __LINUX_CROS_EC_PROTO_H */ |