linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Driver for Feature Integration Technology Inc. (aka Fintek) LPC CIR

 *

 * Copyright (C) 2011 Jarod Wilson <jarod@redhat.com>

 *

 * Special thanks to Fintek for providing hardware and spec sheets.

 * This driver is based upon the nuvoton, ite and ene drivers for

 * similar hardware.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pnp.h>

#include <linux/io.h>

#include <linux/interrupt.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <media/rc-core.h>

​

#include "fintek-cir.h"

​

/* write val to config reg */

static inline void fintek_cr_write(struct fintek_dev *fintek, u8 val, u8 reg)

{

    fit_dbg("%s: reg 0x%02x, val 0x%02x  (ip/dp: %02x/%02x)",

        __func__, reg, val, fintek->cr_ip, fintek->cr_dp);

    outb(reg, fintek->cr_ip);

    outb(val, fintek->cr_dp);

}

​

/* read val from config reg */

static inline u8 fintek_cr_read(struct fintek_dev *fintek, u8 reg)

{

    u8 val;

​

    outb(reg, fintek->cr_ip);

    val = inb(fintek->cr_dp);

​

    fit_dbg("%s: reg 0x%02x, val 0x%02x  (ip/dp: %02x/%02x)",

        __func__, reg, val, fintek->cr_ip, fintek->cr_dp);

    return val;

}

​

/* update config register bit without changing other bits */

static inline void fintek_set_reg_bit(struct fintek_dev *fintek, u8 val, u8 reg)

{

    u8 tmp = fintek_cr_read(fintek, reg) | val;

    fintek_cr_write(fintek, tmp, reg);

}

​

/* clear config register bit without changing other bits */

static inline void fintek_clear_reg_bit(struct fintek_dev *fintek, u8 val, u8 reg)

{

    u8 tmp = fintek_cr_read(fintek, reg) & ~val;

    fintek_cr_write(fintek, tmp, reg);

}

​

/* enter config mode */

static inline void fintek_config_mode_enable(struct fintek_dev *fintek)

{

    /* Enabling Config Mode explicitly requires writing 2x */

    outb(CONFIG_REG_ENABLE, fintek->cr_ip);

    outb(CONFIG_REG_ENABLE, fintek->cr_ip);

}

​

/* exit config mode */

static inline void fintek_config_mode_disable(struct fintek_dev *fintek)

{

    outb(CONFIG_REG_DISABLE, fintek->cr_ip);

}

​

/*

 * When you want to address a specific logical device, write its logical

 * device number to GCR_LOGICAL_DEV_NO

 */

static inline void fintek_select_logical_dev(struct fintek_dev *fintek, u8 ldev)

{

    fintek_cr_write(fintek, ldev, GCR_LOGICAL_DEV_NO);

}

​

/* write val to cir config register */

static inline void fintek_cir_reg_write(struct fintek_dev *fintek, u8 val, u8 offset)

{

    outb(val, fintek->cir_addr + offset);

}

​

/* read val from cir config register */

static u8 fintek_cir_reg_read(struct fintek_dev *fintek, u8 offset)

{