936df1bcb5
Squashed commit of the following:
Change all calls to usleep() in the OS proper to calls to nxsig_usleep()
sched/signal: Add a new OS internal function nxsig_usleep() that is functionally equivalent to usleep() but does not cause a cancellaption point and does not modify the errno variable.
sched/signal: Add a new OS internal function nxsig_sleep() that is functionally equivalent to sleep() but does not cause a cancellaption point.
730 lines
23 KiB
C
730 lines
23 KiB
C
/************************************************************************************
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* drivers/mtd/at24xx.c
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* Driver for I2C-based at24cxx EEPROM(at24c32,at24c64,at24c128,at24c256,at24c512)
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*
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* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
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* Author: Li Zhuoyi <lzyy.cn@gmail.com>
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*
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* Copyright (C) 2013, 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Derived from drivers/mtd/m25px.c
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*
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* Copyright (C) 2009-2011, 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/signal.h>
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#include <nuttx/fs/ioctl.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/mtd/mtd.h>
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#ifdef CONFIG_MTD_AT24XX
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* As a minimum, the size of the AT24 part and its 7-bit I2C address are required. */
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#ifndef CONFIG_AT24XX_SIZE
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# warning "Assuming AT24 size 64"
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# define CONFIG_AT24XX_SIZE 64
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#endif
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#if !defined(CONFIG_AT24XX_ADDR) && !defined(CONFIG_AT24XX_MULTI)
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# warning "Assuming AT24 I2C address of 0x50"
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# define CONFIG_AT24XX_ADDR 0x50
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#endif
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#ifndef CONFIG_AT24XX_FREQUENCY
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# warning "Assuming AT24 I2C frequency of 100KHz"
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# define CONFIG_AT24XX_FREQUENCY 100000
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#endif
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/* Get the part configuration based on the size configuration */
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#if CONFIG_AT24XX_SIZE == 2 /* AT24C02: 2Kbits = 256; 16 * 16 = 256 */
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# define AT24XX_NPAGES 16
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# define AT24XX_PAGESIZE 16
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# define AT24XX_ADDRSIZE 1
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#elif CONFIG_AT24XX_SIZE == 4 /* AT24C04: 4Kbits = 512B; 32 * 16 = 512 */
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# define AT24XX_NPAGES 32
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# define AT24XX_PAGESIZE 16
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# define AT24XX_ADDRSIZE 1
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#elif CONFIG_AT24XX_SIZE == 8 /* AT24C08: 8Kbits = 1KiB; 64 * 16 = 1024 */
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# define AT24XX_NPAGES 64
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# define AT24XX_PAGESIZE 16
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# define AT24XX_ADDRSIZE 1
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#elif CONFIG_AT24XX_SIZE == 16 /* AT24C16: 16Kbits = 2KiB; 128 * 16 = 2048 */
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# define AT24XX_NPAGES 128
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# define AT24XX_PAGESIZE 16
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# define AT24XX_ADDRSIZE 1
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#elif CONFIG_AT24XX_SIZE == 32 /* AT24C32: 32Kbits = 4KiB; 128 * 32 = 4096 */
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# define AT24XX_NPAGES 128
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# define AT24XX_PAGESIZE 32
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# define AT24XX_ADDRSIZE 2
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#elif CONFIG_AT24XX_SIZE == 48 /* AT24C48: 48Kbits = 6KiB; 192 * 32 = 6144 */
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# define AT24XX_NPAGES 192
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# define AT24XX_PAGESIZE 32
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# define AT24XX_ADDRSIZE 2
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#elif CONFIG_AT24XX_SIZE == 64 /* AT24C64: 64Kbits = 8KiB; 256 * 32 = 8192 */
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# define AT24XX_NPAGES 256
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# define AT24XX_PAGESIZE 32
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# define AT24XX_ADDRSIZE 2
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#elif CONFIG_AT24XX_SIZE == 128 /* AT24C128: 128Kbits = 16KiB; 256 * 64 = 16384 */
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# define AT24XX_NPAGES 256
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# define AT24XX_PAGESIZE 64
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# define AT24XX_ADDRSIZE 2
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#elif CONFIG_AT24XX_SIZE == 256 /* AT24C256: 256Kbits = 32KiB; 512 * 64 = 32768 */
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# define AT24XX_NPAGES 512
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# define AT24XX_PAGESIZE 64
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# define AT24XX_ADDRSIZE 2
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#elif CONFIG_AT24XX_SIZE == 512 /* AT24C512: 512Kbits = 64KiB; 512 * 128 = 65536 */
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# define AT24XX_NPAGES 512
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# define AT24XX_PAGESIZE 128
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# define AT24XX_ADDRSIZE 2
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#endif
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/* For applications where a file system is used on the AT24, the tiny page sizes
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* will result in very inefficient FLASH usage. In such cases, it is better if
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* blocks are comprised of "clusters" of pages so that the file system block
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* size is, say, 256 or 512 bytes. In any event, the block size *must* be an
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* even multiple of the pages.
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*/
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#ifndef CONFIG_AT24XX_MTD_BLOCKSIZE
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# warning "Assuming MTD driver block size is the same as the FLASH page size"
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# define CONFIG_AT24XX_MTD_BLOCKSIZE AT24XX_PAGESIZE
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#endif
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#ifndef CONFIG_AT24XX_TIMEOUT_MS
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# define CONFIG_AT24XX_TIMEOUT_MS 10
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#endif
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/************************************************************************************
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* Private Types
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************************************************************************************/
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/* This type represents the state of the MTD device. The struct mtd_dev_s
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* must appear at the beginning of the definition so that you can freely
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* cast between pointers to struct mtd_dev_s and struct at24c_dev_s.
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*/
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struct at24c_dev_s
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{
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struct mtd_dev_s mtd; /* MTD interface */
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FAR struct i2c_master_s *dev; /* Saved I2C interface instance */
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bool initd; /* True: The device has been initialize */
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#ifdef CONFIG_AT24XX_EXTENDED
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bool extended; /* True: use extended memory region */
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#endif
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uint8_t addr; /* I2C address */
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uint16_t pagesize; /* 32, 63 */
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uint16_t npages; /* 128, 256, 512, 1024 */
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};
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/************************************************************************************
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* Private Function Prototypes
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************************************************************************************/
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/* MTD driver methods */
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static int at24c_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks);
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static ssize_t at24c_bread(FAR struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, FAR uint8_t *buf);
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static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, FAR const uint8_t *buf);
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static ssize_t at24c_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes,
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FAR uint8_t *buffer);
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static int at24c_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg);
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/************************************************************************************
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* Private Data
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************************************************************************************/
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#ifndef CONFIG_AT24XX_MULTI
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/* If only a signal AT24 part is supported then a statically allocated state
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* structure may be used.
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*/
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static struct at24c_dev_s g_at24c;
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#endif
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/****************************************************************************
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* Name: at24c_i2c_write
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*
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* Description:
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* Write to the I2C device.
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*
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****************************************************************************/
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static int at24c_i2c_write(FAR struct at24c_dev_s *priv, uint16_t at24addr,
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FAR const uint8_t *buffer, int buflen)
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{
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struct i2c_msg_s msg;
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/* Setup for the transfer */
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msg.frequency = CONFIG_AT24XX_FREQUENCY,
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msg.addr = at24addr;
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msg.flags = 0;
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msg.buffer = (FAR uint8_t *)buffer; /* Override const */
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msg.length = buflen;
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/* Then perform the transfer. */
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return I2C_TRANSFER(priv->dev, &msg, 1);
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}
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/****************************************************************************
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* Name: at24c_i2c_read
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*
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* Description:
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* Read from the I2C device.
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*
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****************************************************************************/
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static int at24c_i2c_read(FAR struct at24c_dev_s *priv, uint16_t at24addr,
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FAR uint8_t *buffer, int buflen)
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{
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struct i2c_msg_s msg;
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/* Setup for the transfer */
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msg.frequency = CONFIG_AT24XX_FREQUENCY,
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msg.addr = at24addr,
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msg.flags = I2C_M_READ;
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msg.buffer = buffer;
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msg.length = buflen;
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/* Then perform the transfer. */
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return I2C_TRANSFER(priv->dev, &msg, 1);
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}
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/************************************************************************************
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* Name: at24c_eraseall
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************************************************************************************/
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static int at24c_eraseall(FAR struct at24c_dev_s *priv)
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{
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uint8_t buf[AT24XX_PAGESIZE + AT24XX_ADDRSIZE];
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int startblock = 0;
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uint16_t wait;
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memset(&buf[AT24XX_ADDRSIZE], 0xff, priv->pagesize);
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for (startblock = 0; startblock < priv->npages; startblock++)
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{
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uint16_t offset = startblock * priv->pagesize;
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uint16_t at24addr;
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#if AT24XX_ADDRSIZE == 2
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buf[1] = offset & 0xff;
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buf[0] = (offset >> 8) & 0xff;
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at24addr = priv->addr;
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#else
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buf[0] = offset & 0xff;
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at24addr = (priv->addr | ((offset >> 8) & 0x07));
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#endif
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wait = CONFIG_AT24XX_TIMEOUT_MS;
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while (at24c_i2c_write(priv, at24addr, buf, AT24XX_ADDRSIZE) < 0)
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{
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finfo("wait\n");
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if (!wait--)
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{
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return -ETIMEDOUT;
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}
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nxsig_usleep(1000);
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}
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at24c_i2c_write(priv, at24addr, buf, AT24XX_PAGESIZE + AT24XX_ADDRSIZE);
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}
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return OK;
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}
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/************************************************************************************
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* Name: at24c_erase
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************************************************************************************/
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static int at24c_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks)
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{
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/* EEprom need not erase */
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return (int)nblocks;
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}
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/************************************************************************************
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* Name: at24c_read_internal
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************************************************************************************/
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static ssize_t at24c_read_internal(FAR struct at24c_dev_s *priv, off_t offset,
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size_t nbytes, FAR uint8_t *buffer,
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uint8_t address)
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{
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uint8_t buf[AT24XX_ADDRSIZE];
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uint16_t at24addr;
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uint16_t wait;
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finfo("offset: %lu nbytes: %lu address: %02x\n",
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(unsigned long)offset, (unsigned long)nbytes, address);
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/* "Random Read: A Random Read requires a dummy byte write sequence to load in the
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* data word address. Once the device address word and data word address are clocked
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* in and acknowledged by the EEPROM, the microcontroller must generate another
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* Start condition. The microcontroller now initiates a current address read
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* by sending a device address with the read/write select bit high. The EEPROM
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* acknowledges the device address and serially clocks out the data word. To end the
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* random read sequence, the microcontroller does not respond with a zero but does
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* generate a Stop condition in the subsequent clock cycle."
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*
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* A repeated START after the address is suggested, however, this simple driver
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* just performs the write as a sepate transfer with an additional, unnecessary STOP.
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*/
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#if AT24XX_ADDRSIZE == 2
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buf[1] = offset & 0xff;
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buf[0] = (offset >> 8) & 0xff;
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at24addr = address;
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#else
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buf[0] = offset & 0xff;
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at24addr = (address | ((offset >> 8) & 0x07));
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#endif
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wait = CONFIG_AT24XX_TIMEOUT_MS;
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while (at24c_i2c_write(priv, at24addr, buf, AT24XX_ADDRSIZE) < 0)
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{
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finfo("wait\n");
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if (!wait--)
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{
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return -ETIMEDOUT;
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}
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nxsig_usleep(1000);
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}
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/* Then transfer the following bytes */
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at24c_i2c_read(priv, at24addr, buffer, nbytes);
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return nbytes;
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}
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/************************************************************************************
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* Name: at24c_bread
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************************************************************************************/
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static ssize_t at24c_bread(FAR struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, FAR uint8_t *buffer)
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{
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FAR struct at24c_dev_s *priv = (FAR struct at24c_dev_s *)dev;
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off_t offset;
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ssize_t nread;
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size_t i;
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#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
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startblock *= (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
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nblocks *= (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
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#endif
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finfo("startblock: %08lx nblocks: %lu\n",
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(unsigned long)startblock, (unsigned long)nblocks);
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if (startblock >= priv->npages)
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{
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return 0;
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}
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if (startblock + nblocks > priv->npages)
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{
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nblocks = priv->npages - startblock;
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}
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/* Convert the access from startblock and number of blocks to a byte
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* offset and number of bytes.
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*/
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offset = startblock * priv->pagesize;
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/* Then perform the byte-oriented read for each block separately */
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for (i = 0; i < nblocks; i++)
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{
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nread = at24c_read_internal(priv, offset, priv->pagesize, buffer,
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priv->addr);
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if (nread < 0)
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{
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return nread;
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}
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offset += priv->pagesize;
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buffer += priv->pagesize;
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}
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#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
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return nblocks / (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
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#else
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return nblocks;
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#endif
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}
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/************************************************************************************
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* Name: at24c_bwrite
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*
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* Operates on MTD block's and translates to FLASH pages
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*
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************************************************************************************/
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static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
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FAR const uint8_t *buffer)
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{
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FAR struct at24c_dev_s *priv = (FAR struct at24c_dev_s *)dev;
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size_t blocksleft;
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uint8_t buf[AT24XX_PAGESIZE + AT24XX_ADDRSIZE];
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uint16_t wait;
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#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
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startblock *= (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
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nblocks *= (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
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#endif
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blocksleft = nblocks;
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if (startblock >= priv->npages)
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{
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return 0;
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}
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if (startblock + nblocks > priv->npages)
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{
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nblocks = priv->npages - startblock;
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}
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finfo("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks);
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while (blocksleft-- > 0)
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{
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uint16_t offset = startblock * priv->pagesize;
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uint16_t at24addr;
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#if AT24XX_ADDRSIZE == 2
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buf[1] = offset & 0xff;
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buf[0] = (offset >> 8) & 0xff;
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at24addr = priv->addr;
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#else
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buf[0] = offset & 0xff;
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at24addr = (priv->addr | ((offset >> 8) & 0x07));
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#endif
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wait = CONFIG_AT24XX_TIMEOUT_MS;
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while (at24c_i2c_write(priv, at24addr, buf, AT24XX_ADDRSIZE) < 0)
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{
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finfo("wait\n");
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if (!wait--)
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{
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return -ETIMEDOUT;
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}
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nxsig_usleep(1000);
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}
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memcpy(&buf[AT24XX_ADDRSIZE], buffer, priv->pagesize);
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at24c_i2c_write(priv, at24addr, buf, priv->pagesize + AT24XX_ADDRSIZE);
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startblock++;
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buffer += priv->pagesize;
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}
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#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
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return nblocks / (CONFIG_AT24XX_MTD_BLOCKSIZE / AT24XX_PAGESIZE);
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#else
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return nblocks;
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#endif
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}
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/************************************************************************************
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* Name: at24c_read
|
|
************************************************************************************/
|
|
|
|
static ssize_t at24c_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes,
|
|
FAR uint8_t *buffer)
|
|
{
|
|
FAR struct at24c_dev_s *priv = (FAR struct at24c_dev_s *)dev;
|
|
size_t memsize;
|
|
uint8_t addr;
|
|
|
|
finfo("offset: %lu nbytes: %lu\n", (unsigned long)offset, (unsigned long)nbytes);
|
|
|
|
/* Don't permit reads beyond the end of the memory region */
|
|
|
|
#ifdef CONFIG_AT24XX_EXTENDED
|
|
if (priv->extended)
|
|
{
|
|
memsize = CONFIG_AT24XX_EXTSIZE;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
memsize = AT24XX_NPAGES * AT24XX_PAGESIZE;
|
|
}
|
|
|
|
if (offset + nbytes > memsize)
|
|
{
|
|
/* Return 0 meaning end-of-file */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Get the I2C address, converting it to the extended I2C if needed */
|
|
|
|
addr = priv->addr;
|
|
#ifdef CONFIG_AT24XX_EXTENDED
|
|
if (priv->extended)
|
|
{
|
|
addr |= 0x08;
|
|
}
|
|
#endif
|
|
|
|
/* Then perform the byte-oriented read using common logic */
|
|
|
|
return at24c_read_internal(priv, offset, nbytes, buffer, addr);
|
|
}
|
|
|
|
/************************************************************************************
|
|
* Name: at24c_ioctl
|
|
************************************************************************************/
|
|
|
|
static int at24c_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
|
|
{
|
|
FAR struct at24c_dev_s *priv = (FAR struct at24c_dev_s *)dev;
|
|
int ret = -EINVAL; /* Assume good command with bad parameters */
|
|
|
|
finfo("cmd: %d \n", cmd);
|
|
|
|
switch (cmd)
|
|
{
|
|
case MTDIOC_GEOMETRY:
|
|
{
|
|
FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)((uintptr_t)arg);
|
|
if (geo)
|
|
{
|
|
/* Populate the geometry structure with information need to know
|
|
* the capacity and how to access the device.
|
|
*
|
|
* NOTE: that the device is treated as though it where just an array
|
|
* of fixed size blocks. That is most likely not true, but the client
|
|
* will expect the device logic to do whatever is necessary to make it
|
|
* appear so.
|
|
*
|
|
* blocksize:
|
|
* May be user defined. The block size for the at24XX devices may be
|
|
* larger than the page size in order to better support file systems.
|
|
* The read and write functions translate BLOCKS to pages for the
|
|
* small flash devices
|
|
* erasesize:
|
|
* It has to be at least as big as the blocksize, bigger serves no
|
|
* purpose.
|
|
* neraseblocks
|
|
* Note that the device size is in kilobits and must be scaled by
|
|
* 1024 / 8
|
|
*/
|
|
|
|
#if CONFIG_AT24XX_MTD_BLOCKSIZE > AT24XX_PAGESIZE
|
|
geo->blocksize = CONFIG_AT24XX_MTD_BLOCKSIZE;
|
|
geo->erasesize = CONFIG_AT24XX_MTD_BLOCKSIZE;
|
|
geo->neraseblocks = (CONFIG_AT24XX_SIZE * 1024 / 8) / CONFIG_AT24XX_MTD_BLOCKSIZE;
|
|
#else
|
|
geo->blocksize = priv->pagesize;
|
|
geo->erasesize = priv->pagesize;
|
|
geo->neraseblocks = priv->npages;
|
|
#endif
|
|
ret = OK;
|
|
|
|
finfo("blocksize: %d erasesize: %d neraseblocks: %d\n",
|
|
geo->blocksize, geo->erasesize, geo->neraseblocks);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MTDIOC_BULKERASE:
|
|
ret = at24c_eraseall(priv);
|
|
break;
|
|
|
|
#ifdef CONFIG_AT24XX_EXTENDED
|
|
case MTDIOC_EXTENDED:
|
|
priv->extended = (arg != 0);
|
|
ret = OK;
|
|
break;
|
|
#endif
|
|
|
|
case MTDIOC_XIPBASE:
|
|
default:
|
|
ret = -ENOTTY; /* Bad command */
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/************************************************************************************
|
|
* Public Functions
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Name: at24c_initialize
|
|
*
|
|
* Description:
|
|
* Create an initialized MTD device instance. MTD devices are not registered
|
|
* in the file system, but are created as instances that can be bound to
|
|
* other functions (such as a block or character driver front end).
|
|
*
|
|
************************************************************************************/
|
|
|
|
#ifdef CONFIG_AT24XX_MULTI
|
|
FAR struct mtd_dev_s *at24c_initialize(FAR struct i2c_master_s *dev, uint8_t address)
|
|
#else
|
|
FAR struct mtd_dev_s *at24c_initialize(FAR struct i2c_master_s *dev)
|
|
#endif
|
|
{
|
|
FAR struct at24c_dev_s *priv;
|
|
|
|
#ifdef CONFIG_AT24XX_MULTI
|
|
finfo("dev: %p address: %02x\n", dev, address);
|
|
|
|
/* Allocate a state structure (we allocate the structure instead of using
|
|
* a fixed, static allocation so that we can handle multiple FLASH devices.
|
|
* The current implementation would handle only one FLASH part per I2C
|
|
* device (only because of the SPIDEV_FLASH(0) definition) and so would have
|
|
* to be extended to handle multiple FLASH parts on the same I2C bus.
|
|
*/
|
|
|
|
priv = (FAR struct at24c_dev_s *)kmm_zalloc(sizeof(struct at24c_dev_s));
|
|
if (priv == NULL)
|
|
{
|
|
ferr("ERROR: Failed to allocate device structure\n");
|
|
return NULL;
|
|
}
|
|
|
|
#else
|
|
finfo("dev: %p\n", dev);
|
|
|
|
/* If only a signal AT24 part is supported then a statically allocated state
|
|
* structure is used.
|
|
*/
|
|
|
|
priv = &g_at24c;
|
|
#endif
|
|
|
|
if (!priv->initd)
|
|
{
|
|
/* Initialize the allocated structure */
|
|
|
|
#ifdef CONFIG_AT24XX_MULTI
|
|
priv->addr = address;
|
|
#else
|
|
priv->addr = CONFIG_AT24XX_ADDR;
|
|
#endif
|
|
priv->pagesize = AT24XX_PAGESIZE;
|
|
priv->npages = AT24XX_NPAGES;
|
|
|
|
/* NOTE since the pre-allocated device structure lies in .bss, any
|
|
* unsupported methods should have been nullified.
|
|
*/
|
|
|
|
priv->mtd.erase = at24c_erase;
|
|
priv->mtd.bread = at24c_bread;
|
|
priv->mtd.bwrite = at24c_bwrite;
|
|
priv->mtd.read = at24c_read;
|
|
priv->mtd.ioctl = at24c_ioctl;
|
|
priv->dev = dev;
|
|
|
|
/* Register the MTD with the procfs system if enabled */
|
|
|
|
#ifdef CONFIG_MTD_REGISTRATION
|
|
mtd_register(&priv->mtd, "at24xx");
|
|
#endif
|
|
priv->initd = true;
|
|
}
|
|
|
|
/* Return the implementation-specific state structure as the MTD device */
|
|
|
|
finfo("Return %p\n", priv);
|
|
return (FAR struct mtd_dev_s *)priv;
|
|
}
|
|
|
|
/************************************************************************************
|
|
* Name: at24c_uninitialize
|
|
*
|
|
* Description:
|
|
* Release resources held by an allocated MTD device instance. Resources are only
|
|
* allocated for the case where multiple AT24xx devices are support.
|
|
*
|
|
************************************************************************************/
|
|
|
|
#ifdef CONFIG_AT24XX_MULTI
|
|
void at24c_uninitialize(FAR struct mtd_dev_s *mtd)
|
|
{
|
|
FAR struct at24c_dev_s *priv = (FAR struct at24c_dev_s *)mtd;
|
|
DEBUGASSERT(priv != NULL);
|
|
|
|
#ifdef CONFIG_MTD_REGISTRATION
|
|
/* Unregister the MTD with the procfs system if enabled */
|
|
|
|
mtd_unregister(&priv->mtd);
|
|
#endif
|
|
|
|
/* Free the MTD driver instance */
|
|
|
|
kmm_free(priv);
|
|
}
|
|
#endif /* CONFIG_AT24XX_MULTI */
|
|
#endif /* CONFIG_MTD_AT24XX */
|