Add disk API

Signed-off-by: Benoît Thébaudeau <benoit@wsystem.com>

dev/disk/disk.h

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2016, Benoît Thébaudeau <benoit@wsystem.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * \addtogroup dev
+ * @{
+ *
+ * \defgroup disk Disk device drivers
+ *
+ * Documentation for all the disk device drivers.
+ * @{
+ *
+ * \file
+ * Header file defining the disk device driver API.
+ */
+#ifndef DISK_H_
+#define DISK_H_
+
+#include <stdint.h>
+
+/** Disk status flags. */
+typedef enum {
+  DISK_STATUS_INIT     = 0x01, /**< Device initialized and ready to work */
+  DISK_STATUS_DISK     = 0x02, /**< Medium present in the drive */
+  DISK_STATUS_WRITABLE = 0x04  /**< Writable medium */
+} disk_status_t;
+
+/** Generic disk I/O control commands. */
+typedef enum {
+  DISK_IOCTL_CTRL_SYNC,        /**< Synchronize the cached writes to persistent storage */
+  DISK_IOCTL_GET_SECTOR_COUNT, /**< Get the sector count through the \c uint32_t pointed to by \c buff */
+  DISK_IOCTL_GET_SECTOR_SIZE,  /**< Get the sector size through the \c uint16_t pointed to by \c buff */
+  DISK_IOCTL_GET_BLOCK_SIZE,   /**< Get the erase block size (in sectors) through the \c uint32_t pointed to by \c buff */
+  DISK_IOCTL_CTRL_TRIM         /**< Trim the sector range within the \c uint32_t boundaries pointed to by \c buff */
+} disk_ioctl_t;
+
+/** Disk access result codes. */
+typedef enum {
+  DISK_RESULT_OK,           /**< Success */
+  DISK_RESULT_IO_ERROR,     /**< Unrecoverable I/O error */
+  DISK_RESULT_WR_PROTECTED, /**< Write-protected medium */
+  DISK_RESULT_NO_INIT,      /**< Device not initialized */
+  DISK_RESULT_INVALID_ARG   /**< Invalid argument */
+} disk_result_t;
+
+/** Disk driver API structure. */
+struct disk_driver {
+  /** Get device status. */
+  disk_status_t (*status)(uint8_t dev);
+
+  /** Initialize device. */
+  disk_status_t (*initialize)(uint8_t dev);
+
+  /** Read sector(s). */
+  disk_result_t (*read)(uint8_t dev, void *buff, uint32_t sector,
+                        uint32_t count);
+
+  /** Write sector(s). */
+  disk_result_t (*write)(uint8_t dev, const void *buff, uint32_t sector,
+                         uint32_t count);
+
+  /** Control device-specific features. */
+  disk_result_t (*ioctl)(uint8_t dev, uint8_t cmd, void *buff);
+};
+
+#endif /* DISK_H_ */
+
+/**
+ * @}
+ * @}
+ */