marvell/linux/drivers/misc/audio-regs.c

/*
 * ASRMICRO Audio driver
 *
 * Copyright (C) 2022 ASRMICRO.
 *
 * Author: Wen Chen <wenchen@asrmicro.com>
 *
 * 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.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/delay.h>
#include <linux/regulator/machine.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/edge_wakeup_mmp.h>
#include <linux/mfd/88pm80x.h>
#include <soc/asr/addr-map.h>

char * vir_MCLK_start_addr = NULL;

char * get_MCLK_start_addr(void)
{
    return vir_MCLK_start_addr;
}
EXPORT_SYMBOL_GPL(get_MCLK_start_addr);

static int audio_regs_probe(struct platform_device *pdev)
{
    struct resource *MCLK_reg_res = NULL;

    printk(KERN_INFO "enter %s. \n", __FUNCTION__);

    /* get the resource */
    MCLK_reg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!MCLK_reg_res) {
        printk(KERN_INFO "Couldn't platform_get_resource.\n");
        return -ENOENT;
    }

    vir_MCLK_start_addr = ioremap(MCLK_reg_res->start, resource_size(MCLK_reg_res));
    if (!vir_MCLK_start_addr) {
        printk(KERN_INFO "Couldn't ioremap\n");
        return -ENOMEM;
    }

    printk(KERN_INFO"%s, phy MCLK_reg_res start is 0x%0x, vir_MCLK_start_addr is 0x%0x.\n",
            __FUNCTION__, (unsigned int)(MCLK_reg_res->start), (unsigned int)vir_MCLK_start_addr);

    return 0;
}

static int audio_regs_remove(struct platform_device *pdev)
{
    printk(KERN_INFO "enter %s. \n", __FUNCTION__);

    if (vir_MCLK_start_addr) {
        iounmap(vir_MCLK_start_addr);
    }

    return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id audio_regs_dt_match[] = {
    { .compatible = "ASRMICRO,audio-registers", },
    {},
};
#endif

static struct platform_driver audio_regs_driver = {
    .driver		= {
        .name	= "audio-registers",
        .owner	= THIS_MODULE,
#ifdef CONFIG_OF
        .of_match_table = of_match_ptr(audio_regs_dt_match),
#endif
    },
    .probe		= audio_regs_probe,
    .remove		= audio_regs_remove,
};

static int audio_regs_init(void)
{
    return platform_driver_register(&audio_regs_driver);
}

static void audio_regs_exit(void)
{
    platform_driver_unregister(&audio_regs_driver);
}

subsys_initcall(audio_regs_init);
//module_init(audio_regs_init);
module_exit(audio_regs_exit);

MODULE_AUTHOR("Wen Chen <wenchen@asrmicro.com>");
MODULE_DESCRIPTION("driver for audio registers config");
MODULE_LICENSE("GPL v2");