drivers/mfd/cros_ec_dev.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * cros_ec_dev - expose the Chrome OS Embedded Controller to userspace
   4  *
   5  * Copyright (C) 2014 Google, Inc.
   6  */
   7
   8 #ifndef _CROS_EC_DEV_H_
   9 #define _CROS_EC_DEV_H_
  10
  11 #include <linux/ioctl.h>
  12 #include <linux/types.h>
  13 #include <linux/mfd/cros_ec.h>
  14
  15 #define CROS_EC_DEV_VERSION "1.0.0"
  16
  17 /**
  18  * struct cros_ec_readmem - Struct used to read mapped memory.
  19  * @offset: Within EC_LPC_ADDR_MEMMAP region.
  20  * @bytes: Number of bytes to read. Zero means "read a string" (including '\0')
  21  *         At most only EC_MEMMAP_SIZE bytes can be read.
  22  * @buffer: Where to store the result. The ioctl returns the number of bytes
  23  *         read or negative on error.
  24  */
  25 struct cros_ec_readmem {
  26         uint32_t offset;
  27         uint32_t bytes;
  28         uint8_t buffer[EC_MEMMAP_SIZE];
  29 };
  30
  31 #define CROS_EC_DEV_IOC       0xEC
  32 #define CROS_EC_DEV_IOCXCMD   _IOWR(CROS_EC_DEV_IOC, 0, struct cros_ec_command)
  33 #define CROS_EC_DEV_IOCRDMEM  _IOWR(CROS_EC_DEV_IOC, 1, struct cros_ec_readmem)
  34
  35 #endif /* _CROS_EC_DEV_H_ */