sound.c

[詳解]

/** @file
    @brief      サウンドドライバ

    @date       2007.07.15
    @author     Takashi SHUDO

    @info

    下位ドライバに圧電ブザーデバイスドライバが必要

    使用方法

    ioctl(周波数(Hz), 再生時間(x1ms))
*/

#include "sysconfig.h"
#include "device.h"
#include "device/buzzer_ioctl.h"
#include "timer.h"
#include "tkprintf.h"

//#define DEBUGKBITS 0x03
#include "dkprintf.h"


#define TIMER_INTERVAL_TIME     GSC_KERNEL_TIMER_INTERVAL_MSEC

static struct st_device *buzzer_dev;
static int sound_cnt;

static void sound_timer(void *sp, unsigned long long time)
{
        if(sound_cnt > 0) {
                DKPRINTF(0x01, ".");
                sound_cnt -= TIMER_INTERVAL_TIME;
                if(sound_cnt <= 0) {
                        ioctl_device(buzzer_dev, IOCMD_BUZZER_OFF, 0, 0);
                        DKPRINTF(0x01, "SND OFF : %d\n", (int)get_kernel_time());
                }
        }
}

static int sound_register(struct st_device *dev, char *param)
{
        // param = ブザードライバ名

        buzzer_dev = open_device(param);

        if(buzzer_dev == 0) {
                SYSERR_PRINT("Cannot open device %s.\n", param);
                return -1;
        }

        if(register_timer_func(sound_timer, TIMER_INTERVAL_TIME)) {
                SYSERR_PRINT("Cannot register buzzer timer func.\n");
                return -1;
        }

        sound_cnt = 0;

        return 0;
}

static int sound_unregister(struct st_device *dev)
{
        unregister_timer_func(sound_timer);

        return 0;
}

static int sound_open(struct st_device *dev)
{
        return 0;
}

static int sound_close(struct st_device *dev)
{
        return 0;
}

static int sound_ioctl(struct st_device *dev, unsigned int com, unsigned int arg, void *param)
{
        /*
         * com : Hz
         * arg : ms
         */

        if(arg != 0) {
                sound_cnt = arg;
                DKPRINTF(0x01, "SND LEN : %d\n", (int)arg);
                DKPRINTF(0x01, "SND ON  : %d\n", (int)get_kernel_time());
                ioctl_device(buzzer_dev, IOCMD_BUZZER_ON, com, 0);
        } else {
                ioctl_device(buzzer_dev, IOCMD_BUZZER_OFF, 0, 0);
        }

        return 0;
}

const struct st_device sound_device = {
        .name           = "sound",
        .explan         = "Buzzer sound control",
        .register_dev   = sound_register,
        .unregister_dev = sound_unregister,
        .open           = sound_open,
        .close          = sound_close,
        .ioctl          = sound_ioctl,
};