linux-imx

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

/*

 * GPIO driver for the ACCES PCIe-IDIO-24 family

 * Copyright (C) 2018 William Breathitt Gray

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License, version 2, as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * This driver supports the following ACCES devices: PCIe-IDIO-24,

 * PCIe-IDI-24, PCIe-IDO-24, and PCIe-IDIO-12.

 */

#include <linux/bitmap.h>

#include <linux/bitops.h>

#include <linux/device.h>

#include <linux/errno.h>

#include <linux/gpio/driver.h>

#include <linux/interrupt.h>

#include <linux/irqdesc.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/spinlock.h>

#include <linux/types.h>

​

/**

 * struct idio_24_gpio_reg - GPIO device registers structure

 * @out0_7: Read: FET Outputs 0-7

 *      Write: FET Outputs 0-7

 * @out8_15:    Read: FET Outputs 8-15

 *      Write: FET Outputs 8-15

 * @out16_23:   Read: FET Outputs 16-23

 *      Write: FET Outputs 16-23

 * @ttl_out0_7: Read: TTL/CMOS Outputs 0-7

 *      Write: TTL/CMOS Outputs 0-7

 * @in0_7:  Read: Isolated Inputs 0-7

 *      Write: Reserved

 * @in8_15: Read: Isolated Inputs 8-15

 *      Write: Reserved

 * @in16_23:    Read: Isolated Inputs 16-23

 *      Write: Reserved

 * @ttl_in0_7:  Read: TTL/CMOS Inputs 0-7

 *      Write: Reserved

 * @cos0_7: Read: COS Status Inputs 0-7

 *      Write: COS Clear Inputs 0-7

 * @cos8_15:    Read: COS Status Inputs 8-15

 *      Write: COS Clear Inputs 8-15

 * @cos16_23:   Read: COS Status Inputs 16-23

 *      Write: COS Clear Inputs 16-23

 * @cos_ttl0_7: Read: COS Status TTL/CMOS 0-7

 *      Write: COS Clear TTL/CMOS 0-7

 * @ctl:    Read: Control Register

 *      Write: Control Register

 * @reserved:   Read: Reserved

 *      Write: Reserved

 * @cos_enable: Read: COS Enable

 *      Write: COS Enable

 * @soft_reset: Read: IRQ Output Pin Status

 *      Write: Software Board Reset

 */

struct idio_24_gpio_reg {

    u8 out0_7;

    u8 out8_15;

    u8 out16_23;

    u8 ttl_out0_7;

    u8 in0_7;

    u8 in8_15;

    u8 in16_23;

    u8 ttl_in0_7;

    u8 cos0_7;

    u8 cos8_15;

    u8 cos16_23;

    u8 cos_ttl0_7;

    u8 ctl;

    u8 reserved;

    u8 cos_enable;

    u8 soft_reset;

};

​

/**

 * struct idio_24_gpio - GPIO device private data structure

 * @chip:   instance of the gpio_chip

 * @lock:   synchronization lock to prevent I/O race conditions

 * @reg:    I/O address offset for the GPIO device registers

 * @irq_mask:   I/O bits affected by interrupts

 */

struct idio_24_gpio {