185f812c41
Sphinx expects Return: and not @return to indicate a return value.
find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;
find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
655 lines
19 KiB
C
655 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Chromium OS cros_ec driver
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*
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* Copyright (c) 2012 The Chromium OS Authors.
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*/
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#ifndef _CROS_EC_H
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#define _CROS_EC_H
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#include <linux/compiler.h>
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#include <ec_commands.h>
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#include <cros_ec_message.h>
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#include <asm/gpio.h>
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#include <dm/of_extra.h>
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/* Our configuration information */
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struct cros_ec_dev {
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struct udevice *dev; /* Transport device */
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struct gpio_desc ec_int; /* GPIO used as EC interrupt line */
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int protocol_version; /* Protocol version to use */
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int optimise_flash_write; /* Don't write erased flash blocks */
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/*
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* These two buffers will always be dword-aligned and include enough
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* space for up to 7 word-alignment bytes also, so we can ensure that
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* the body of the message is always dword-aligned (64-bit).
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*
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* We use this alignment to keep ARM and x86 happy. Probably word
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* alignment would be OK, there might be a small performance advantage
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* to using dword.
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*/
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uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
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__aligned(sizeof(int64_t));
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uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
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__aligned(sizeof(int64_t));
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};
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/*
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* Hard-code the number of columns we happen to know we have right now. It
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* would be more correct to call cros_ec_info() at startup and determine the
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* actual number of keyboard cols from there.
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*/
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#define CROS_EC_KEYSCAN_COLS 13
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/* Information returned by a key scan */
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struct mbkp_keyscan {
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uint8_t data[CROS_EC_KEYSCAN_COLS];
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};
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/* Holds information about the Chrome EC */
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struct fdt_cros_ec {
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struct fmap_entry flash; /* Address and size of EC flash */
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/*
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* Byte value of erased flash, or -1 if not known. It is normally
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* 0xff but some flash devices use 0 (e.g. STM32Lxxx)
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*/
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int flash_erase_value;
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struct fmap_entry region[EC_FLASH_REGION_COUNT];
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};
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/**
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* Read the ID of the CROS-EC device
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*
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* The ID is a string identifying the CROS-EC device.
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*
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* @param dev CROS-EC device
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* @param id Place to put the ID
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* @param maxlen Maximum length of the ID field
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_read_id(struct udevice *dev, char *id, int maxlen);
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/**
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* Read a keyboard scan from the CROS-EC device
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*
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* Send a message requesting a keyboard scan and return the result
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*
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* @param dev CROS-EC device
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* @param scan Place to put the scan results
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan);
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/**
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* Get the next pending MKBP event from the ChromeOS EC device.
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*
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* Send a message requesting the next event and return the result.
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*
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* @param event Place to put the event.
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* Return: 0 if ok, <0 on error.
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*/
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int cros_ec_get_next_event(struct udevice *dev,
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struct ec_response_get_next_event *event);
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/**
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* Read which image is currently running on the CROS-EC device.
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*
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* @param dev CROS-EC device
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* @param image Destination for image identifier
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* Return: 0 if ok, <0 on error
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*/
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int cros_ec_read_current_image(struct udevice *dev,
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enum ec_current_image *image);
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/**
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* Read the hash of the CROS-EC device firmware.
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*
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* @param dev CROS-EC device
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* @param hash_offset Offset in flash to read from
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* @param hash Destination for hash information
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* Return: 0 if ok, <0 on error
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*/
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int cros_ec_read_hash(struct udevice *dev, uint hash_offset,
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struct ec_response_vboot_hash *hash);
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/**
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* Send a reboot command to the CROS-EC device.
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*
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* Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
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*
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* @param dev CROS-EC device
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* @param cmd Reboot command
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* @param flags Flags for reboot command (EC_REBOOT_FLAG_*)
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* Return: 0 if ok, <0 on error
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*/
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int cros_ec_reboot(struct udevice *dev, enum ec_reboot_cmd cmd, uint8_t flags);
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/**
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* Check if the CROS-EC device has an interrupt pending.
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*
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* Read the status of the external interrupt connected to the CROS-EC device.
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* If no external interrupt is configured, this always returns 1.
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*
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* @param dev CROS-EC device
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* Return: 0 if no interrupt is pending
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*/
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int cros_ec_interrupt_pending(struct udevice *dev);
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enum {
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CROS_EC_OK,
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CROS_EC_ERR = 1,
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CROS_EC_ERR_FDT_DECODE,
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CROS_EC_ERR_CHECK_VERSION,
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CROS_EC_ERR_READ_ID,
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CROS_EC_ERR_DEV_INIT,
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};
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/**
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* Initialise the Chromium OS EC driver
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*
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* @param blob Device tree blob containing setup information
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* @param cros_ecp Returns pointer to the cros_ec device, or NULL if none
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* Return: 0 if we got an cros_ec device and all is well (or no cros_ec is
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* expected), -ve if we should have an cros_ec device but failed to find
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* one, or init failed (-CROS_EC_ERR_...).
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*/
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int cros_ec_init(const void *blob, struct udevice**cros_ecp);
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/**
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* Read information about the keyboard matrix
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*
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* @param dev CROS-EC device
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* @param info Place to put the info structure
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*/
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int cros_ec_info(struct udevice *dev, struct ec_response_mkbp_info *info);
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/**
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* Read the host event flags
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*
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* @param dev CROS-EC device
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* @param events_ptr Destination for event flags. Not changed on error.
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* Return: 0 if ok, <0 on error
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*/
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int cros_ec_get_host_events(struct udevice *dev, uint32_t *events_ptr);
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/**
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* Clear the specified host event flags
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*
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* @param dev CROS-EC device
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* @param events Event flags to clear
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* Return: 0 if ok, <0 on error
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*/
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int cros_ec_clear_host_events(struct udevice *dev, uint32_t events);
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/**
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* Get/set flash protection
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*
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* @param dev CROS-EC device
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* @param set_mask Mask of flags to set; if 0, just retrieves existing
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* protection state without changing it.
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* @param set_flags New flag values; only bits in set_mask are applied;
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* ignored if set_mask=0.
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* @param prot Destination for updated protection state from EC.
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* Return: 0 if ok, <0 on error
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*/
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int cros_ec_flash_protect(struct udevice *dev, uint32_t set_mask,
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uint32_t set_flags,
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struct ec_response_flash_protect *resp);
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/**
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* Run internal tests on the cros_ec interface.
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*
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* @param dev CROS-EC device
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* Return: 0 if ok, <0 if the test failed
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*/
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int cros_ec_test(struct udevice *dev);
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/**
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* Update the EC RW copy.
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*
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* @param dev CROS-EC device
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* @param image the content to write
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* @param imafge_size content length
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* Return: 0 if ok, <0 if the test failed
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*/
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int cros_ec_flash_update_rw(struct udevice *dev, const uint8_t *image,
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int image_size);
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/**
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* Return a pointer to the board's CROS-EC device
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*
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* Return: pointer to CROS-EC device, or NULL if none is available
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*/
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struct udevice *board_get_cros_ec_dev(void);
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struct dm_cros_ec_ops {
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/**
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* check_version() - Check the protocol version being used (optional)
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*
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* If provided, this function should check that the EC can be supported
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* by the driver. If not provided, HELLO messages will be sent to try
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* to determine the protocol version.
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*
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* @dev: Device to check
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* @return 0 if the protocol is valid, -ve if not supported
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*/
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int (*check_version)(struct udevice *dev);
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/**
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* command() - Old-style command interface
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*
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* This sends a command and receives a response (deprecated, use
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* packet())
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*
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* @dev: Device to use
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* @cmd: Command to send (only supports 0-0xff)
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* @cmd_version: Version of command to send (often 0)
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* @dout: Output data (may be NULL If dout_len=0)
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* @dout_len: Length of output data excluding 4-byte header
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* @dinp: On input, set to point to input data, often struct
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* cros_ec_dev->din - typically this is left alone but may be
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* updated by the driver
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* @din_len: Maximum length of response
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* @return number of bytes in response, or -ve on error
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*/
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int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
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const uint8_t *dout, int dout_len,
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uint8_t **dinp, int din_len);
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/**
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* packet() - New-style command interface
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*
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* This interface is preferred over command(), since it is typically
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* easier to implement.
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*
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* @dev: Device to use
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* @out_bytes: Number of bytes to send (from struct cros_ec_dev->dout)
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* @in_bytes: Maximum number of bytes to expect in response
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* @return number of bytes in response, or -ve on error
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*/
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int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
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/**
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* get_switches() - Get value of EC switches
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*
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* This is currently supported on the LPC EC.
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*
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* @dev: Device to use
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* @return current switches value, or -ENOSYS if not supported
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*/
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int (*get_switches)(struct udevice *dev);
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};
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#define dm_cros_ec_get_ops(dev) \
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((struct dm_cros_ec_ops *)(dev)->driver->ops)
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int cros_ec_register(struct udevice *dev);
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/**
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* Dump a block of data for a command.
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*
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* @param name Name for data (e.g. 'in', 'out')
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* @param cmd Command number associated with data, or -1 for none
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* @param data Data block to dump
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* @param len Length of data block to dump
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*/
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void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len);
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/**
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* Calculate a simple 8-bit checksum of a data block
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*
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* @param data Data block to checksum
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* @param size Size of data block in bytes
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* Return: checksum value (0 to 255)
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*/
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int cros_ec_calc_checksum(const uint8_t *data, int size);
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int cros_ec_flash_erase(struct udevice *dev, uint32_t offset, uint32_t size);
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/**
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* Read data from the flash
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*
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* Read an arbitrary amount of data from the EC flash, by repeatedly reading
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* small blocks.
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*
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* The offset starts at 0. You can obtain the region information from
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* cros_ec_flash_offset() to find out where to read for a particular region.
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*
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* @param dev CROS-EC device
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* @param data Pointer to data buffer to read into
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* @param offset Offset within flash to read from
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* @param size Number of bytes to read
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_flash_read(struct udevice *dev, uint8_t *data, uint32_t offset,
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uint32_t size);
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/**
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* Read back flash parameters
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*
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* This function reads back parameters of the flash as reported by the EC
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*
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* @param dev Pointer to device
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* @param info Pointer to output flash info struct
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*/
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int cros_ec_read_flashinfo(struct udevice *dev,
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struct ec_response_flash_info *info);
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/**
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* Write data to the flash
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*
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* Write an arbitrary amount of data to the EC flash, by repeatedly writing
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* small blocks.
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*
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* The offset starts at 0. You can obtain the region information from
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* cros_ec_flash_offset() to find out where to write for a particular region.
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*
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* Attempting to write to the region where the EC is currently running from
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* will result in an error.
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*
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* @param dev CROS-EC device
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* @param data Pointer to data buffer to write
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* @param offset Offset within flash to write to.
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* @param size Number of bytes to write
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_flash_write(struct udevice *dev, const uint8_t *data,
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uint32_t offset, uint32_t size);
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/**
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* Obtain position and size of a flash region
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*
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* @param dev CROS-EC device
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* @param region Flash region to query
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* @param offset Returns offset of flash region in EC flash
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* @param size Returns size of flash region
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_flash_offset(struct udevice *dev, enum ec_flash_region region,
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uint32_t *offset, uint32_t *size);
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/**
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* cros_ec_get_sku_id() - Read the SKU ID
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*
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* @dev: CROS-EC device
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* return SKU ID, or -ve on error
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*/
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int cros_ec_get_sku_id(struct udevice *dev);
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/**
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* Read/write non-volatile data from/to a CROS-EC device.
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*
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* @param dev CROS-EC device
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* @param block Buffer of VbNvContext to be read/write
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_read_nvdata(struct udevice *dev, uint8_t *block, int size);
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int cros_ec_write_nvdata(struct udevice *dev, const uint8_t *block, int size);
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/**
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* Read the version information for the EC images
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*
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* @param dev CROS-EC device
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* @param versionp This is set to point to the version information
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_read_version(struct udevice *dev,
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struct ec_response_get_version **versionp);
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/**
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* Read the build information for the EC
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*
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* @param dev CROS-EC device
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* @param versionp This is set to point to the build string
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_read_build_info(struct udevice *dev, char **strp);
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/**
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* Switch on/off a LDO / FET.
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*
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* @param dev CROS-EC device
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* @param index index of the LDO/FET to switch
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* @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state);
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/**
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* Read back a LDO / FET current state.
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*
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* @param dev CROS-EC device
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* @param index index of the LDO/FET to switch
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* @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
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* Return: 0 if ok, -1 on error
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*/
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int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state);
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/**
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* Get access to the error reported when cros_ec_board_init() was called
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*
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* This permits delayed reporting of the EC error if it failed during
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* early init.
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*
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* Return: error (0 if there was no error, -ve if there was an error)
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*/
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int cros_ec_get_error(void);
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/**
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* Returns information from the FDT about the Chrome EC flash
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*
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* @param dev Device to read from
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* @param config Structure to use to return information
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*/
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int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config);
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/**
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* Check the current keyboard state, in case recovery mode is requested.
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* This function is for sandbox only.
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*
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* @param ec CROS-EC device
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*/
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void cros_ec_check_keyboard(struct udevice *dev);
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struct i2c_msg;
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/*
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* Tunnel an I2C transfer to the EC
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*
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* @param dev CROS-EC device
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* @param port The remote port on EC to use
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* @param msg List of messages to transfer
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* @param nmsgs Number of messages to transfer
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*/
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int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,
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int nmsgs);
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/**
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* cros_ec_get_events_b() - Get event mask B
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*
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* Return: value of event mask, default value of 0 if it could not be read
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*/
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uint64_t cros_ec_get_events_b(struct udevice *dev);
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/**
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* cros_ec_clear_events_b() - Clear even mask B
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*
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* Any pending events in the B range are cleared
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*
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* Return: 0 if OK, -ve on error
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*/
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int cros_ec_clear_events_b(struct udevice *dev, uint64_t mask);
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/**
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* cros_ec_efs_verify() - tell the EC to verify one of its images
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*
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* @param dev CROS-EC device
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* @param region Flash region to query
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* Return: 0 if OK, -ve on error
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*/
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int cros_ec_efs_verify(struct udevice *dev, enum ec_flash_region region);
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/**
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* cros_ec_battery_cutoff() - Request that the battery be cut off
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*
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* This tells the battery to stop supplying power. This is used before shipping
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* a device to ensure that the battery remains charged while the device is
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* shipped or sitting on the shelf waiting to be purchased.
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*
|
|
* @param dev CROS-EC device
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|
* @param flags Flags to use (EC_BATTERY_CUTOFF_FLAG_...)
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|
* Return: 0 if OK, -ve on error
|
|
*/
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int cros_ec_battery_cutoff(struct udevice *dev, uint8_t flags);
|
|
|
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/**
|
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* cros_ec_set_pwm_duty() - Set duty cycle of a generic pwm
|
|
*
|
|
* Note that duty value needs to be passed to the EC as a 16 bit number
|
|
* for increased precision.
|
|
*
|
|
* @param dev CROS-EC device
|
|
* @param index Index of the pwm
|
|
* @param duty Desired duty cycle, in 0..EC_PWM_MAX_DUTY range.
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int cros_ec_set_pwm_duty(struct udevice *dev, uint8_t index, uint16_t duty);
|
|
|
|
/**
|
|
* cros_ec_read_limit_power() - Check if power is limited by batter/charger
|
|
*
|
|
* Sometimes the battery is low and / or the device is connected to a charger
|
|
* that cannot supply much power.
|
|
*
|
|
* @param dev CROS-EC device
|
|
* @param limit_powerp Returns whether power is limited (0 or 1)
|
|
* Return: 0 if OK, -ENOSYS if the EC does not support this comment, -EINVAL
|
|
* if the EC returned an invalid response
|
|
*/
|
|
int cros_ec_read_limit_power(struct udevice *dev, int *limit_powerp);
|
|
|
|
/**
|
|
* cros_ec_config_powerbtn() - Configure the behaviour of the power button
|
|
*
|
|
* @param dev CROS-EC device
|
|
* @param flags Flags to use (EC_POWER_BUTTON_...)
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int cros_ec_config_powerbtn(struct udevice *dev, uint32_t flags);
|
|
|
|
/**
|
|
* cros_ec_get_lid_shutdown_mask() - Set the lid shutdown mask
|
|
*
|
|
* Determines whether a lid close event is reported
|
|
*
|
|
* @param dev CROS-EC device
|
|
* Return: shufdown mas if OK, -ve on error
|
|
*/
|
|
int cros_ec_get_lid_shutdown_mask(struct udevice *dev);
|
|
|
|
/**
|
|
* cros_ec_set_lid_shutdown_mask() - Set the lid shutdown mask
|
|
*
|
|
* Set whether a lid close event is reported
|
|
*
|
|
* @param dev CROS-EC device
|
|
* @param enable true to enable reporting, false to disable
|
|
* Return: shufdown mas if OK, -ve on error
|
|
*/
|
|
int cros_ec_set_lid_shutdown_mask(struct udevice *dev, int enable);
|
|
|
|
/**
|
|
* cros_ec_hello() - Send a hello message
|
|
*
|
|
* Sends a message with a fixed input value and checks that the expected output
|
|
* value is received
|
|
*
|
|
* @dev: CROS-EC device
|
|
* @handshakep: If non-NULL, returns received handshake value on error
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int cros_ec_hello(struct udevice *dev, uint *handshakep);
|
|
|
|
/**
|
|
* cros_ec_get_features() - Get the set of features provided by the EC
|
|
*
|
|
* See enum ec_feature_code for the list of available features
|
|
*
|
|
* @dev: CROS-EC device
|
|
* @featuresp: Returns a bitmask of supported features
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int cros_ec_get_features(struct udevice *dev, u64 *featuresp);
|
|
|
|
/**
|
|
* cros_ec_check_feature() - Check if a feature is supported
|
|
*
|
|
* @dev: CROS-EC device
|
|
* @feature: Feature number to check (enum ec_feature_code)
|
|
* Return: true if supported, false if not, -ve on error
|
|
*/
|
|
int cros_ec_check_feature(struct udevice *dev, uint feature);
|
|
|
|
/**
|
|
* cros_ec_get_switches() - Get switches value
|
|
*
|
|
* @dev: CROS-EC device
|
|
* Return: switches value, or -ENOSYS if not supported, or other -ve value on
|
|
* other error
|
|
*/
|
|
int cros_ec_get_switches(struct udevice *dev);
|
|
|
|
/**
|
|
* cros_ec_vstore_supported() - Check if vstore is supported
|
|
*
|
|
* @dev: CROS-EC device
|
|
* Return: false if not supported, true if supported, -ve on error
|
|
*/
|
|
int cros_ec_vstore_supported(struct udevice *dev);
|
|
|
|
/**
|
|
* cros_ec_vstore_info() - Get vstore information
|
|
*
|
|
* @dev: CROS-EC device
|
|
* @lockedp: mask of locked slots
|
|
* Return: number of vstore slots supported by the EC,, -ve on error
|
|
*/
|
|
int cros_ec_vstore_info(struct udevice *dev, u32 *lockedp);
|
|
|
|
/**
|
|
* cros_ec_vstore_read() - Read data from EC vstore slot
|
|
*
|
|
* @dev: CROS-EC device
|
|
* @slot: vstore slot to read from
|
|
* @data: buffer to store read data, must be EC_VSTORE_SLOT_SIZE bytes
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int cros_ec_vstore_read(struct udevice *dev, int slot, uint8_t *data);
|
|
|
|
/**
|
|
* cros_ec_vstore_write() - Save data into EC vstore slot
|
|
*
|
|
* The maximum size of data is EC_VSTORE_SLOT_SIZE. It is the caller's
|
|
* responsibility to check the number of implemented slots by querying the
|
|
* vstore info.
|
|
*
|
|
* @dev: CROS-EC device
|
|
* @slot: vstore slot to write into
|
|
* @data: data to write
|
|
* @size: size of data in bytes
|
|
* Return: 0 if OK, -ve on error
|
|
*/
|
|
int cros_ec_vstore_write(struct udevice *dev, int slot, const uint8_t *data,
|
|
size_t size);
|
|
|
|
/**
|
|
* cros_ec_read_batt_charge() - Read the battery-charge state
|
|
*
|
|
* @dev: CROS-EC device
|
|
* @chargep: Return battery-charge state as a percentage
|
|
*/
|
|
int cros_ec_read_batt_charge(struct udevice *dev, uint *chargep);
|
|
|
|
#endif
|