linux-imx

/*

 * GPIO Chip driver for Analog Devices

 * ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller

 *

 * Copyright 2009-2010 Analog Devices Inc.

 *

 * Licensed under the GPL-2 or later.

 */

​

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/i2c.h>

#include <linux/gpio/driver.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/of_device.h>

​

#include <linux/platform_data/adp5588.h>

​

#define DRV_NAME    "adp5588-gpio"

​

/*

 * Early pre 4.0 Silicon required to delay readout by at least 25ms,

 * since the Event Counter Register updated 25ms after the interrupt

 * asserted.

 */

#define WA_DELAYED_READOUT_REVID(rev)   ((rev) < 4)

​

struct adp5588_gpio {

    struct i2c_client *client;

    struct gpio_chip gpio_chip;

    struct mutex lock;  /* protect cached dir, dat_out */

    /* protect serialized access to the interrupt controller bus */

    struct mutex irq_lock;

    uint8_t dat_out[3];

    uint8_t dir[3];

    uint8_t int_lvl_low[3];

    uint8_t int_lvl_high[3];

    uint8_t int_en[3];

    uint8_t irq_mask[3];

    uint8_t int_input_en[3];

};

​

static int adp5588_gpio_read(struct i2c_client *client, u8 reg)

{

    int ret = i2c_smbus_read_byte_data(client, reg);

​

    if (ret < 0)

        dev_err(&client->dev, "Read Error\n");

​

    return ret;

}

​

static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)

{

    int ret = i2c_smbus_write_byte_data(client, reg, val);

​

    if (ret < 0)

        dev_err(&client->dev, "Write Error\n");

​

    return ret;