linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * Driver for 93xx46 EEPROMs

 *

 * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>

 */

​

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/gpio/consumer.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/of_gpio.h>

#include <linux/slab.h>

#include <linux/spi/spi.h>

#include <linux/nvmem-provider.h>

#include <linux/eeprom_93xx46.h>

​

#define OP_START    0x4

#define OP_WRITE    (OP_START | 0x1)

#define OP_READ     (OP_START | 0x2)

#define ADDR_EWDS   0x00

#define ADDR_ERAL   0x20

#define ADDR_EWEN   0x30

​

struct eeprom_93xx46_devtype_data {

    unsigned int quirks;

};

​

static const struct eeprom_93xx46_devtype_data atmel_at93c46d_data = {

    .quirks = EEPROM_93XX46_QUIRK_SINGLE_WORD_READ |

          EEPROM_93XX46_QUIRK_INSTRUCTION_LENGTH,

};

​

struct eeprom_93xx46_dev {

    struct spi_device *spi;

    struct eeprom_93xx46_platform_data *pdata;

    struct mutex lock;

    struct nvmem_config nvmem_config;

    struct nvmem_device *nvmem;

    int addrlen;

    int size;

};

​

static inline bool has_quirk_single_word_read(struct eeprom_93xx46_dev *edev)

{

    return edev->pdata->quirks & EEPROM_93XX46_QUIRK_SINGLE_WORD_READ;

}

​

static inline bool has_quirk_instruction_length(struct eeprom_93xx46_dev *edev)

{

    return edev->pdata->quirks & EEPROM_93XX46_QUIRK_INSTRUCTION_LENGTH;

}

​

static int eeprom_93xx46_read(void *priv, unsigned int off,

                  void *val, size_t count)

{

    struct eeprom_93xx46_dev *edev = priv;

    char *buf = val;

    int err = 0;