9 files changed, 337 insertions, 223 deletions

diff --git a/drivers/mfd/cros_ec_dev.h b/drivers/mfd/cros_ec_dev.h
index 45e9453608c5..978d836a0248 100644
--- a/drivers/mfd/cros_ec_dev.h
+++ b/drivers/mfd/cros_ec_dev.h
@@ -26,12 +26,13 @@
 
 #define CROS_EC_DEV_VERSION "1.0.0"
 
-/*
- * @offset: within EC_LPC_ADDR_MEMMAP region
- * @bytes: number of bytes to read. zero means "read a string" (including '\0')
- *         (at most only EC_MEMMAP_SIZE bytes can be read)
- * @buffer: where to store the result
- * ioctl returns the number of bytes read, negative on error
+/**
+ * struct cros_ec_readmem - Struct used to read mapped memory.
+ * @offset: Within EC_LPC_ADDR_MEMMAP region.
+ * @bytes: Number of bytes to read. Zero means "read a string" (including '\0')
+ *         At most only EC_MEMMAP_SIZE bytes can be read.
+ * @buffer: Where to store the result. The ioctl returns the number of bytes
+ *         read or negative on error.
  */
 struct cros_ec_readmem {
         uint32_t offset;
diff --git a/drivers/platform/chrome/chromeos_tbmc.c b/drivers/platform/chrome/chromeos_tbmc.c
index 1e81f8144c0d..ce259ec9f990 100644
--- a/drivers/platform/chrome/chromeos_tbmc.c
+++ b/drivers/platform/chrome/chromeos_tbmc.c
@@ -99,7 +99,7 @@ static const struct acpi_device_id chromeos_tbmc_acpi_device_ids[] = {
 };
 MODULE_DEVICE_TABLE(acpi, chromeos_tbmc_acpi_device_ids);
 
-static const SIMPLE_DEV_PM_OPS(chromeos_tbmc_pm_ops, NULL,
+static SIMPLE_DEV_PM_OPS(chromeos_tbmc_pm_ops, NULL,
                 chromeos_tbmc_resume);
 
 static struct acpi_driver chromeos_tbmc_driver = {
diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 31c8b8c49e45..e1b75775cd4a 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -25,14 +25,16 @@
 #include <linux/dmi.h>
 #include <linux/delay.h>
 #include <linux/io.h>
+#include <linux/interrupt.h>
 #include <linux/mfd/cros_ec.h>
 #include <linux/mfd/cros_ec_commands.h>
-#include <linux/mfd/cros_ec_lpc_reg.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/printk.h>
 #include <linux/suspend.h>
 
+#include "cros_ec_lpc_reg.h"
+
 #define DRV_NAME "cros_ec_lpcs"
 #define ACPI_DRV_NAME "GOOG0004"
 
@@ -248,7 +250,7 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
         acpi_status status;
         struct cros_ec_device *ec_dev;
         u8 buf[2];
-        int ret;
+        int irq, ret;
 
         if (!devm_request_region(dev, EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE,
                                  dev_name(dev))) {
@@ -287,6 +289,18 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
                            sizeof(struct ec_response_get_protocol_info);
         ec_dev->dout_size = sizeof(struct ec_host_request);
 
+        /*
+         * Some boards do not have an IRQ allotted for cros_ec_lpc,
+         * which makes ENXIO an expected (and safe) scenario.
+         */
+        irq = platform_get_irq(pdev, 0);
+        if (irq > 0)
+                ec_dev->irq = irq;
+        else if (irq != -ENXIO) {
+                dev_err(dev, "couldn't retrieve IRQ number (%d)\n", irq);
+                return irq;
+        }
+
         ret = cros_ec_register(ec_dev);
         if (ret) {
                 dev_err(dev, "couldn't register ec_dev (%d)\n", ret);
diff --git a/drivers/platform/chrome/cros_ec_lpc_mec.c b/drivers/platform/chrome/cros_ec_lpc_mec.c
index 2eda2c2fc210..c4edfa83e493 100644
--- a/drivers/platform/chrome/cros_ec_lpc_mec.c
+++ b/drivers/platform/chrome/cros_ec_lpc_mec.c
@@ -24,10 +24,11 @@
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/mfd/cros_ec_commands.h>
-#include <linux/mfd/cros_ec_lpc_mec.h>
 #include <linux/mutex.h>
 #include <linux/types.h>
 
+#include "cros_ec_lpc_mec.h"
+
 /*
  * This mutex must be held while accessing the EMI unit. We can't rely on the
  * EC mutex because memmap data may be accessed without it being held.
diff --git a/include/linux/mfd/cros_ec_lpc_mec.h b/drivers/platform/chrome/cros_ec_lpc_mec.h
index 176496ddc66c..105068c0e919 100644
--- a/include/linux/mfd/cros_ec_lpc_mec.h
+++ b/drivers/platform/chrome/cros_ec_lpc_mec.h
@@ -21,8 +21,8 @@
  * expensive.
  */
 
-#ifndef __LINUX_MFD_CROS_EC_MEC_H
-#define __LINUX_MFD_CROS_EC_MEC_H
+#ifndef __CROS_EC_LPC_MEC_H
+#define __CROS_EC_LPC_MEC_H
 
 #include <linux/mfd/cros_ec_commands.h>
 
@@ -87,4 +87,4 @@ void cros_ec_lpc_mec_destroy(void);
 u8 cros_ec_lpc_io_bytes_mec(enum cros_ec_lpc_mec_io_type io_type,
                             unsigned int offset, unsigned int length, u8 *buf);
 
-#endif /* __LINUX_MFD_CROS_EC_MEC_H */
+#endif /* __CROS_EC_LPC_MEC_H */
diff --git a/drivers/platform/chrome/cros_ec_lpc_reg.c b/drivers/platform/chrome/cros_ec_lpc_reg.c
index dcc7a3e30604..fc23d535c404 100644
--- a/drivers/platform/chrome/cros_ec_lpc_reg.c
+++ b/drivers/platform/chrome/cros_ec_lpc_reg.c
@@ -24,7 +24,8 @@
 #include <linux/io.h>
 #include <linux/mfd/cros_ec.h>
 #include <linux/mfd/cros_ec_commands.h>
-#include <linux/mfd/cros_ec_lpc_mec.h>
+
+#include "cros_ec_lpc_mec.h"
 
 static u8 lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest)
 {
diff --git a/include/linux/mfd/cros_ec_lpc_reg.h b/drivers/platform/chrome/cros_ec_lpc_reg.h
index 5560bef63c2b..1c12c38b306a 100644
--- a/include/linux/mfd/cros_ec_lpc_reg.h
+++ b/drivers/platform/chrome/cros_ec_lpc_reg.h
@@ -21,8 +21,8 @@
  * expensive.
  */
 
-#ifndef __LINUX_MFD_CROS_EC_REG_H
-#define __LINUX_MFD_CROS_EC_REG_H
+#ifndef __CROS_EC_LPC_REG_H
+#define __CROS_EC_LPC_REG_H
 
 /**
  * cros_ec_lpc_read_bytes - Read bytes from a given LPC-mapped address.
@@ -58,4 +58,4 @@ void cros_ec_lpc_reg_init(void);
  */
 void cros_ec_lpc_reg_destroy(void);
 
-#endif /* __LINUX_MFD_CROS_EC_REG_H */
+#endif /* __CROS_EC_LPC_REG_H */
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 20949dde35cd..e44e3ec8a9c7 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -36,7 +36,7 @@
  * 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
@@ -58,13 +58,14 @@ enum {
         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 - 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;
@@ -76,48 +77,55 @@ struct cros_ec_command {
 };
 
 /**
- * struct cros_ec_device - Information about a ChromeOS EC device
- *
- * @phys_name: name of physical comms layer (e.g. 'i2c-4')
+ * 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.
+ * @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.
+ * @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.
  */
 struct cros_ec_device {
-
         /* These are used by other drivers that want to talk to the EC */
         const char *phys_name;
         struct device *dev;
@@ -153,20 +161,19 @@ struct cros_ec_device {
 };
 
 /**
- * struct cros_ec_sensor_platform - ChromeOS EC sensor platform information
- *
+ * 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 - 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;
@@ -175,16 +182,16 @@ struct cros_ec_platform {
 
 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 - 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.
+ * @features: Features supported by the EC.
  */
 struct cros_ec_dev {
         struct device class_dev;
@@ -200,124 +207,129 @@ 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
+ * 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.
  *
- * ec_dev: Device to suspend
- * @return 0 if ok, -ve on error
+ * 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
+ * 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.
  *
- * @ec_dev: Device to resume
- * @return 0 if ok, -ve on error
+ * 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
+ * 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.
  *
- * @ec_dev: Device to register
- * @msg: Message to write
+ * 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
+ * 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.
  *
- * @ec_dev: EC device
- * @msg: Message to check
+ * 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
+ * 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.
  *
- * @ec_dev: EC device
- * @msg: Message to write
+ * 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
+ * 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.
  *
- * @ec_dev: EC device
- * @msg: Message to write
- * @return: Num. of bytes transferred on success, <0 on failure
+ * 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_remove - Remove a ChromeOS EC
+ * cros_ec_remove() - Remove a ChromeOS EC.
+ * @ec_dev: Device to register.
  *
  * 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
+ * Return: 0 on success or negative error code.
  */
 int cros_ec_remove(struct cros_ec_device *ec_dev);
 
 /**
- * cros_ec_register - Register a new ChromeOS EC, using the provided info
+ * 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.
  *
- * @ec_dev: Device to register
- * @return 0 if ok, -ve on error
+ * Return: 0 on success or negative error code.
  */
 int cros_ec_register(struct cros_ec_device *ec_dev);
 
 /**
- * cros_ec_query_all -  Query the protocol version supported by the ChromeOS EC
+ * cros_ec_query_all() -  Query the protocol version supported by the
+ *         ChromeOS EC.
+ * @ec_dev: Device to register.
  *
- * @ec_dev: Device to register
- * @return 0 if ok, -ve on error
+ * 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
+ * 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
+ * Return: 0 on success or negative error code.
  */
 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.
+ * 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.
+ * 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.
  *
- * This function is a helper to know which events are raised.
+ * Return: 0 on success or negative error code.
  */
 u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev);
 
diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index 5fd0e429f472..9a9631f0559e 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -306,15 +306,18 @@ enum host_event_code {
 /* Host event mask */
 #define EC_HOST_EVENT_MASK(event_code) (1UL << ((event_code) - 1))
 
-/* Arguments at EC_LPC_ADDR_HOST_ARGS */
+/**
+ * struct ec_lpc_host_args - Arguments at EC_LPC_ADDR_HOST_ARGS
+ * @flags: The host argument flags.
+ * @command_version: Command version.
+ * @data_size: The length of data.
+ * @checksum: Checksum; sum of command + flags + command_version + data_size +
+ *            all params/response data bytes.
+ */
 struct ec_lpc_host_args {
         uint8_t flags;
         uint8_t command_version;
         uint8_t data_size;
-        /*
-         * Checksum; sum of command + flags + command_version + data_size +
-         * all params/response data bytes.
-         */
         uint8_t checksum;
 } __packed;
 
@@ -468,54 +471,43 @@ struct ec_lpc_host_args {
 
 #define EC_HOST_REQUEST_VERSION 3
 
-/* Version 3 request from host */
+/**
+ * struct ec_host_request - Version 3 request from host.
+ * @struct_version: Should be 3. The EC will return EC_RES_INVALID_HEADER if it
+ *                  receives a header with a version it doesn't know how to
+ *                  parse.
+ * @checksum: Checksum of request and data; sum of all bytes including checksum
+ *            should total to 0.
+ * @command: Command to send (EC_CMD_...)
+ * @command_version: Command version.
+ * @reserved: Unused byte in current protocol version; set to 0.
+ * @data_len: Length of data which follows this header.
+ */
 struct ec_host_request {
-        /* Struct version (=3)
-         *
-         * EC will return EC_RES_INVALID_HEADER if it receives a header with a
-         * version it doesn't know how to parse.
-         */
         uint8_t struct_version;
-
-        /*
-         * Checksum of request and data; sum of all bytes including checksum
-         * should total to 0.
-         */
         uint8_t checksum;
-
-        /* Command code */
         uint16_t command;
-
-        /* Command version */
         uint8_t command_version;
-
-        /* Unused byte in current protocol version; set to 0 */
         uint8_t reserved;
-
-        /* Length of data which follows this header */
         uint16_t data_len;
 } __packed;
 
 #define EC_HOST_RESPONSE_VERSION 3
 
-/* Version 3 response from EC */
+/**
+ * struct ec_host_response - Version 3 response from EC.
+ * @struct_version: Struct version (=3).
+ * @checksum: Checksum of response and data; sum of all bytes including
+ *            checksum should total to 0.
+ * @result: EC's response to the command (separate from communication failure)
+ * @data_len: Length of data which follows this header.
+ * @reserved: Unused bytes in current protocol version; set to 0.
+ */
 struct ec_host_response {
-        /* Struct version (=3) */
         uint8_t struct_version;
-
-        /*
-         * Checksum of response and data; sum of all bytes including checksum
-         * should total to 0.
-         */
         uint8_t checksum;
-
-        /* Result code (EC_RES_*) */
         uint16_t result;
-
-        /* Length of data which follows this header */
         uint16_t data_len;
-
-        /* Unused bytes in current protocol version; set to 0 */
         uint16_t reserved;
 } __packed;
 
@@ -540,6 +532,10 @@ struct ec_host_response {
  */
 #define EC_CMD_PROTO_VERSION 0x00
 
+/**
+ * struct ec_response_proto_version - Response to the proto version command.
+ * @version: The protocol version.
+ */
 struct ec_response_proto_version {
         uint32_t version;
 } __packed;
@@ -550,12 +546,20 @@ struct ec_response_proto_version {
  */
 #define EC_CMD_HELLO 0x01
 
+/**
+ * struct ec_params_hello - Parameters to the hello command.
+ * @in_data: Pass anything here.
+ */
 struct ec_params_hello {
-        uint32_t in_data;  /* Pass anything here */
+        uint32_t in_data;
 } __packed;
 
+/**
+ * struct ec_response_hello - Response to the hello command.
+ * @out_data: Output will be in_data + 0x01020304.
+ */
 struct ec_response_hello {
-        uint32_t out_data;  /* Output will be in_data + 0x01020304 */
+        uint32_t out_data;
 } __packed;
 
 /* Get version number */
@@ -567,22 +571,37 @@ enum ec_current_image {
         EC_IMAGE_RW
 };
 
+/**
+ * struct ec_response_get_version - Response to the get version command.
+ * @version_string_ro: Null-terminated RO firmware version string.
+ * @version_string_rw: Null-terminated RW firmware version string.
+ * @reserved: Unused bytes; was previously RW-B firmware version string.
+ * @current_image: One of ec_current_image.
+ */
 struct ec_response_get_version {
-        /* Null-terminated version strings for RO, RW */
         char version_string_ro[32];
         char version_string_rw[32];
-        char reserved[32];       /* Was previously RW-B string */
-        uint32_t current_image;  /* One of ec_current_image */
+        char reserved[32];
+        uint32_t current_image;
 } __packed;
 
 /* Read test */
 #define EC_CMD_READ_TEST 0x03
 
+/**
+ * struct ec_params_read_test - Parameters for the read test command.
+ * @offset: Starting value for read buffer.
+ * @size: Size to read in bytes.
+ */
 struct ec_params_read_test {
-        uint32_t offset;   /* Starting value for read buffer */
-        uint32_t size;     /* Size to read in bytes */
+        uint32_t offset;
+        uint32_t size;
 } __packed;
 
+/**
+ * struct ec_response_read_test - Response to the read test command.
+ * @data: Data returned by the read test command.
+ */
 struct ec_response_read_test {
         uint32_t data[32];
 } __packed;
@@ -597,18 +616,27 @@ struct ec_response_read_test {
 /* Get chip info */
 #define EC_CMD_GET_CHIP_INFO 0x05
 
+/**
+ * struct ec_response_get_chip_info - Response to the get chip info command.
+ * @vendor: Null-terminated string for chip vendor.
+ * @name: Null-terminated string for chip name.
+ * @revision: Null-terminated string for chip mask version.
+ */
 struct ec_response_get_chip_info {
-        /* Null-terminated strings */
         char vendor[32];
         char name[32];
-        char revision[32];  /* Mask version */
+        char revision[32];
 } __packed;
 
 /* Get board HW version */
 #define EC_CMD_GET_BOARD_VERSION 0x06
 
+/**
+ * struct ec_response_board_version - Response to the board version command.
+ * @board_version: A monotonously incrementing number.
+ */
 struct ec_response_board_version {
-        uint16_t board_version;  /* A monotonously incrementing number. */
+        uint16_t board_version;
 } __packed;
 
 /*
@@ -621,27 +649,42 @@ struct ec_response_board_version {
  */
 #define EC_CMD_READ_MEMMAP 0x07
 
+/**
+ * struct ec_params_read_memmap - Parameters for the read memory map command.
+ * @offset: Offset in memmap (EC_MEMMAP_*).
+ * @size: Size to read in bytes.
+ */
 struct ec_params_read_memmap {
-        uint8_t offset;   /* Offset in memmap (EC_MEMMAP_*) */
-        uint8_t size;     /* Size to read in bytes */
+        uint8_t offset;
+        uint8_t size;
 } __packed;
 
 /* Read versions supported for a command */
 #define EC_CMD_GET_CMD_VERSIONS 0x08
 
+/**
+ * struct ec_params_get_cmd_versions - Parameters for the get command versions.
+ * @cmd: Command to check.
+ */
 struct ec_params_get_cmd_versions {
-        uint8_t cmd;      /* Command to check */
+        uint8_t cmd;
 } __packed;
 
+/**
+ * struct ec_params_get_cmd_versions_v1 - Parameters for the get command
+ *         versions (v1)
+ * @cmd: Command to check.
+ */
 struct ec_params_get_cmd_versions_v1 {
-        uint16_t cmd;     /* Command to check */
+        uint16_t cmd;
 } __packed;
 
+/**
+ * struct ec_response_get_cmd_version - Response to the get command versions.
+ * @version_mask: Mask of supported versions; use EC_VER_MASK() to compare with
+ *                a desired version.
+ */
 struct ec_response_get_cmd_versions {
-        /*
-         * Mask of supported versions; use EC_VER_MASK() to compare with a
-         * desired version.
-         */
         uint32_t version_mask;
 } __packed;
 
@@ -659,6 +702,11 @@ enum ec_comms_status {
         EC_COMMS_STATUS_PROCESSING      = 1 << 0,       /* Processing cmd */
 };
 
+/**
+ * struct ec_response_get_comms_status - Response to the get comms status
+ *         command.
+ * @flags: Mask of enum ec_comms_status.
+ */
 struct ec_response_get_comms_status {
         uint32_t flags;         /* Mask of enum ec_comms_status */
 } __packed;
@@ -685,19 +733,19 @@ struct ec_response_test_protocol {
 /* EC_RES_IN_PROGRESS may be returned if a command is slow */
 #define EC_PROTOCOL_INFO_IN_PROGRESS_SUPPORTED (1 << 0)
 
+/**
+ * struct ec_response_get_protocol_info - Response to the get protocol info.
+ * @protocol_versions: Bitmask of protocol versions supported (1 << n means
+ *                     version n).
+ * @max_request_packet_size: Maximum request packet size in bytes.
+ * @max_response_packet_size: Maximum response packet size in bytes.
+ * @flags: see EC_PROTOCOL_INFO_*
+ */
 struct ec_response_get_protocol_info {
         /* Fields which exist if at least protocol version 3 supported */
-
-        /* Bitmask of protocol versions supported (1 << n means version n)*/
         uint32_t protocol_versions;
-
-        /* Maximum request packet size, in bytes */
         uint16_t max_request_packet_size;
-
-        /* Maximum response packet size, in bytes */
         uint16_t max_response_packet_size;
-
-        /* Flags; see EC_PROTOCOL_INFO_* */
         uint32_t flags;
 } __packed;
 
@@ -708,8 +756,10 @@ struct ec_response_get_protocol_info {
 /* The upper byte of .flags tells what to do (nothing means "get") */
 #define EC_GSV_SET        0x80000000
 
-/* The lower three bytes of .flags identifies the parameter, if that has
-   meaning for an individual command. */
+/*
+ * The lower three bytes of .flags identifies the parameter, if that has
+ * meaning for an individual command.
+ */
 #define EC_GSV_PARAM_MASK 0x00ffffff
 
 struct ec_params_get_set_value {
@@ -810,6 +860,7 @@ enum ec_feature_code {
 
 #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
 #define EC_FEATURE_MASK_1(event_code) (1UL << (event_code - 32))
+
 struct ec_response_get_features {
         uint32_t flags[2];
 } __packed;
@@ -820,24 +871,22 @@ struct ec_response_get_features {
 /* Get flash info */
 #define EC_CMD_FLASH_INFO 0x10
 
-/* Version 0 returns these fields */
+/**
+ * struct ec_response_flash_info - Response to the flash info command.
+ * @flash_size: Usable flash size in bytes.
+ * @write_block_size: Write block size. Write offset and size must be a
+ *                    multiple of this.
+ * @erase_block_size: Erase block size. Erase offset and size must be a
+ *                    multiple of this.
+ * @protect_block_size: Protection block size. Protection offset and size
+ *                      must be a multiple of this.
+ *
+ * Version 0 returns these fields.
+ */
 struct ec_response_flash_info {
-        /* Usable flash size, in bytes */
         uint32_t flash_size;
-        /*
-         * Write block size.  Write offset and size must be a multiple
-         * of this.
-         */
         uint32_t write_block_size;
-        /*
-         * Erase block size.  Erase offset and size must be a multiple
-         * of this.
-         */
         uint32_t erase_block_size;
-        /*
-         * Protection block size.  Protection offset and size must be a
-         * multiple of this.
-         */
         uint32_t protect_block_size;
 } __packed;
 
@@ -845,7 +894,22 @@ struct ec_response_flash_info {
 /* EC flash erases bits to 0 instead of 1 */
 #define EC_FLASH_INFO_ERASE_TO_0 (1 << 0)
 
-/*
+/**
+ * struct ec_response_flash_info_1 - Response to the flash info v1 command.
+ * @flash_size: Usable flash size in bytes.
+ * @write_block_size: Write block size. Write offset and size must be a
+ *                    multiple of this.
+ * @erase_block_size: Erase block size. Erase offset and size must be a
+ *                    multiple of this.
+ * @protect_block_size: Protection block size. Protection offset and size
+ *                      must be a multiple of this.
+ * @write_ideal_size: Ideal write size in bytes.  Writes will be fastest if
+ *                    size is exactly this and offset is a multiple of this.
+ *                    For example, an EC may have a write buffer which can do
+ *                    half-page operations if data is aligned, and a slower
+ *                    word-at-a-time write mode.
+ * @flags: Flags; see EC_FLASH_INFO_*
+ *
  * Version 1 returns the same initial fields as version 0, with additional
  * fields following.
  *
@@ -860,15 +924,7 @@ struct ec_response_flash_info_1 {
         uint32_t protect_block_size;
 
         /* Version 1 adds these fields: */
-        /*
-         * Ideal write size in bytes.  Writes will be fastest if size is
-         * exactly this and offset is a multiple of this.  For example, an EC
-         * may have a write buffer which can do half-page operations if data is
-         * aligned, and a slower word-at-a-time write mode.
-         */
         uint32_t write_ideal_size;
-
-        /* Flags; see EC_FLASH_INFO_* */
         uint32_t flags;
 } __packed;
 
@@ -879,9 +935,14 @@ struct ec_response_flash_info_1 {
  */
 #define EC_CMD_FLASH_READ 0x11
 
+/**
+ * struct ec_params_flash_read - Parameters for the flash read command.
+ * @offset: Byte offset to read.
+ * @size: Size to read in bytes.
+ */
 struct ec_params_flash_read {
-        uint32_t offset;   /* Byte offset to read */
-        uint32_t size;     /* Size to read in bytes */
+        uint32_t offset;
+        uint32_t size;
 } __packed;
 
 /* Write flash */
@@ -891,18 +952,28 @@ struct ec_params_flash_read {
 /* Version 0 of the flash command supported only 64 bytes of data */
 #define EC_FLASH_WRITE_VER0_SIZE 64
 
+/**
+ * struct ec_params_flash_write - Parameters for the flash write command.
+ * @offset: Byte offset to write.
+ * @size: Size to write in bytes.
+ */
 struct ec_params_flash_write {
-        uint32_t offset;   /* Byte offset to write */
-        uint32_t size;     /* Size to write in bytes */
+        uint32_t offset;
+        uint32_t size;
         /* Followed by data to write */
 } __packed;
 
 /* Erase flash */
 #define EC_CMD_FLASH_ERASE 0x13
 
+/**
+ * struct ec_params_flash_erase - Parameters for the flash erase command.
+ * @offset: Byte offset to erase.
+ * @size: Size to erase in bytes.
+ */
 struct ec_params_flash_erase {
-        uint32_t offset;   /* Byte offset to erase */
-        uint32_t size;     /* Size to erase in bytes */
+        uint32_t offset;
+        uint32_t size;
 } __packed;
 
 /*
@@ -941,21 +1012,28 @@ struct ec_params_flash_erase {
 /* Entile flash code protected when the EC boots */
 #define EC_FLASH_PROTECT_ALL_AT_BOOT        (1 << 6)
 
+/**
+ * struct ec_params_flash_protect - Parameters for the flash protect command.
+ * @mask: Bits in flags to apply.
+ * @flags: New flags to apply.
+ */
 struct ec_params_flash_protect {
-        uint32_t mask;   /* Bits in flags to apply */
-        uint32_t flags;  /* New flags to apply */
+        uint32_t mask;
+        uint32_t flags;
 } __packed;
 
+/**
+ * struct ec_response_flash_protect - Response to the flash protect command.
+ * @flags: Current value of flash protect flags.
+ * @valid_flags: Flags which are valid on this platform. This allows the
+ *               caller to distinguish between flags which aren't set vs. flags
+ *               which can't be set on this platform.
+ * @writable_flags: Flags which can be changed given the current protection
+ *                  state.
+ */
 struct ec_response_flash_protect {
-        /* Current value of flash protect flags */
         uint32_t flags;
-        /*
-         * Flags which are valid on this platform.  This allows the caller
-         * to distinguish between flags which aren't set vs. flags which can't
-         * be set on this platform.
-         */
         uint32_t valid_flags;
-        /* Flags which can be changed given the current protection state */
         uint32_t writable_flags;
 } __packed;
 
@@ -982,8 +1060,13 @@ enum ec_flash_region {
         EC_FLASH_REGION_COUNT,
 };
 
+/**
+ * struct ec_params_flash_region_info - Parameters for the flash region info
+ *         command.
+ * @region: Flash region; see EC_FLASH_REGION_*
+ */
 struct ec_params_flash_region_info {
-        uint32_t region;  /* enum ec_flash_region */
+        uint32_t region;
 } __packed;
 
 struct ec_response_flash_region_info {
@@ -1094,7 +1177,9 @@ struct rgb_s {
 };
 
 #define LB_BATTERY_LEVELS 4
-/* List of tweakable parameters. NOTE: It's __packed so it can be sent in a
+
+/*
+ * List of tweakable parameters. NOTE: It's __packed so it can be sent in a
  * host command, but the alignment is the same regardless. Keep it that way.
  */
 struct lightbar_params_v0 {