linux-imx

/*

 * Support for the GPIO/IRQ expander chips present on several HTC phones.

 * These are implemented in CPLD chips present on the board.

 *

 * Copyright (c) 2007 Kevin O'Connor <kevin@koconnor.net>

 * Copyright (c) 2007 Philipp Zabel <philipp.zabel@gmail.com>

 *

 * This file may be distributed under the terms of the GNU GPL license.

 */

​

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/io.h>

#include <linux/spinlock.h>

#include <linux/platform_data/gpio-htc-egpio.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/gpio/driver.h>

​

struct egpio_chip {

    int              reg_start;

    int              cached_values;

    unsigned long    is_out;

    struct device    *dev;

    struct gpio_chip chip;

};

​

struct egpio_info {

    spinlock_t        lock;

​

    /* iomem info */

    void __iomem      *base_addr;

    int               bus_shift;    /* byte shift */

    int               reg_shift;    /* bit shift */

    int               reg_mask;

​

    /* irq info */

    int               ack_register;

    int               ack_write;

    u16               irqs_enabled;

    uint              irq_start;

    int               nirqs;

    uint              chained_irq;

​

    /* egpio info */

    struct egpio_chip *chip;

    int               nchips;

};

​

static inline void egpio_writew(u16 value, struct egpio_info *ei, int reg)

{

    writew(value, ei->base_addr + (reg << ei->bus_shift));

}

​

static inline u16 egpio_readw(struct egpio_info *ei, int reg)

{

    return readw(ei->base_addr + (reg << ei->bus_shift));

}

​

/*