mwavedd.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

					interruptible_sleep_on(&pDrvData->IPCs[ipcnum].ipc_wait_queue);
					pDrvData->IPCs[ipcnum].bIsHere = FALSE;
					if (pDrvData->IPCs[ipcnum].usIntCount == 1) {
						pDrvData->IPCs[ipcnum].
						usIntCount = 2;
					}
					spin_unlock_irqrestore(&ipc_lock, flags);
					PRINTK_2(TRACE_MWAVE,
						"mwavedd::mwave_ioctl IOCTL_MW_GET_IPC ipcnum %x woke up and returning to application\n",
						ipcnum);
				}
				PRINTK_2(TRACE_MWAVE,
					"mwavedd::mwave_ioctl IOCTL_MW_GET_IPC, returning thread for ipc %x processing\n",
					ipcnum);
			}
		}
			break;
	
		case IOCTL_MW_UNREGISTER_IPC: {
			unsigned int ipcnum = (unsigned int) ioarg;
	
			PRINTK_2(TRACE_MWAVE,
				"mwavedd::mwave_ioctl IOCTL_MW_UNREGISTER_IPC ipcnum %x\n",
				ipcnum);
			if (ipcnum > 16) {
				PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd::mwave_ioctl: IOCTL_MW_UNREGISTER_IPC: Error: Invalid ipcnum %x\n", ipcnum);
				return -EINVAL;
			}
			if (pDrvData->IPCs[ipcnum].bIsEnabled == TRUE) {
				pDrvData->IPCs[ipcnum].bIsEnabled = FALSE;
				if (pDrvData->IPCs[ipcnum].bIsHere == TRUE) {
					wake_up_interruptible(&pDrvData->IPCs[ipcnum].ipc_wait_queue);
				}
			}
		}
			break;
	
		default:
			PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd::mwave_ioctl: Error: Unrecognized iocmd %x\n", iocmd);
			return -ENOTTY;
			break;
	} /* switch */

	PRINTK_2(TRACE_MWAVE, "mwavedd::mwave_ioctl, exit retval %x\n", retval);

	return retval;
}


static ssize_t mwave_read(struct file *file, char *buf, size_t count,
                          loff_t * ppos)
{
	PRINTK_5(TRACE_MWAVE,
		"mwavedd::mwave_read entry file %p, buf %p, count %x ppos %p\n",
		file, buf, count, ppos);

	return -EINVAL;
}


static ssize_t mwave_write(struct file *file, const char *buf,
                           size_t count, loff_t * ppos)
{
	PRINTK_5(TRACE_MWAVE,
		"mwavedd::mwave_write entry file %p, buf %p, count %x ppos %p\n",
		file, buf, count, ppos);

	return -EINVAL;
}


static int register_serial_portandirq(unsigned int port, int irq)
{
	struct serial_struct serial;

	switch ( port ) {
		case 0x3f8:
		case 0x2f8:
		case 0x3e8:
		case 0x2e8:
			/* OK */
			break;
		default:
			PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd::register_serial_portandirq: Error: Illegal port %x\n", port );
			return -1;
	} /* switch */
	/* port is okay */

	switch ( irq ) {
		case 3:
		case 4:
		case 5:
		case 7:
			/* OK */
			break;
		default:
			PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd::register_serial_portandirq: Error: Illegal irq %x\n", irq );
			return -1;
	} /* switch */
	/* irq is okay */

	memset(&serial, 0, sizeof(serial));
	serial.port = port;
	serial.irq = irq;
	serial.flags = ASYNC_SHARE_IRQ;

	return register_serial(&serial);
}


#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
static struct file_operations mwave_fops = {
	owner:THIS_MODULE,
	read:mwave_read,
	write:mwave_write,
	ioctl:mwave_ioctl,
	open:mwave_open,
	release:mwave_close
};
#else
static struct file_operations mwave_fops = {
	NULL,			/* lseek */
	mwave_read,		/* read */
	mwave_write,		/* write */
	NULL,			/* readdir */
	NULL,			/* poll */
	mwave_ioctl,		/* ioctl */
	NULL,			/* mmap */
	mwave_open,		/* open */
	NULL,			/* flush */
	mwave_close		/* release */
};
#endif

static struct miscdevice mwave_misc_dev = { MWAVE_MINOR, "mwave", &mwave_fops };

/*
* mwave_init is called on module load
*
* mwave_exit is called on module unload
* mwave_exit is also used to clean up after an aborted mwave_init
*/
static void mwave_exit(void)
{
	pMWAVE_DEVICE_DATA pDrvData = &mwave_s_mdd;

	PRINTK_1(TRACE_MWAVE, "mwavedd::mwave_exit entry\n");

	if (pDrvData->bProcEntryCreated) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
		remove_proc_entry("mwave", NULL);
#else
		proc_unregister(&proc_root, mwave_proc.low_ino);
#endif
	}
	if ( pDrvData->sLine >= 0 ) {
		unregister_serial(pDrvData->sLine);
	}
	if (pDrvData->bMwaveDevRegistered) {
		misc_deregister(&mwave_misc_dev);
	}
	if (pDrvData->bDSPEnabled) {
		tp3780I_DisableDSP(&pDrvData->rBDData);
	}
	if (pDrvData->bResourcesClaimed) {
		tp3780I_ReleaseResources(&pDrvData->rBDData);
	}
	if (pDrvData->bBDInitialized) {
		tp3780I_Cleanup(&pDrvData->rBDData);
	}

	PRINTK_1(TRACE_MWAVE, "mwavedd::mwave_exit exit\n");
}

module_exit(mwave_exit);

static int __init mwave_init(void)
{
	int i;
	int retval = 0;
	unsigned int resultMiscRegister;
	pMWAVE_DEVICE_DATA pDrvData = &mwave_s_mdd;

	memset(&mwave_s_mdd, 0, sizeof(MWAVE_DEVICE_DATA));

	PRINTK_1(TRACE_MWAVE, "mwavedd::mwave_init entry\n");

	pDrvData->bBDInitialized = FALSE;
	pDrvData->bResourcesClaimed = FALSE;
	pDrvData->bDSPEnabled = FALSE;
	pDrvData->bDSPReset = FALSE;
	pDrvData->bMwaveDevRegistered = FALSE;
	pDrvData->sLine = -1;
	pDrvData->bProcEntryCreated = FALSE;

	for (i = 0; i < 16; i++) {
		pDrvData->IPCs[i].bIsEnabled = FALSE;
		pDrvData->IPCs[i].bIsHere = FALSE;
		pDrvData->IPCs[i].usIntCount = 0;	/* no ints received yet */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
		init_waitqueue_head(&pDrvData->IPCs[i].ipc_wait_queue);
#endif
	}

	retval = tp3780I_InitializeBoardData(&pDrvData->rBDData);
	PRINTK_2(TRACE_MWAVE,
		"mwavedd::mwave_init, return from tp3780I_InitializeBoardData retval %x\n",
		retval);
	if (retval) {
		PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd::mwave_init: Error: Failed to initialize board data\n");
		goto cleanup_error;
	}
	pDrvData->bBDInitialized = TRUE;

	retval = tp3780I_CalcResources(&pDrvData->rBDData);
	PRINTK_2(TRACE_MWAVE,
		"mwavedd::mwave_init, return from tp3780I_CalcResources retval %x\n",
		retval);
	if (retval) {
		PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd:mwave_init: Error: Failed to calculate resources\n");
		goto cleanup_error;
	}

	retval = tp3780I_ClaimResources(&pDrvData->rBDData);
	PRINTK_2(TRACE_MWAVE,
		"mwavedd::mwave_init, return from tp3780I_ClaimResources retval %x\n",
		retval);
	if (retval) {
		PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd:mwave_init: Error: Failed to claim resources\n");
		goto cleanup_error;
	}
	pDrvData->bResourcesClaimed = TRUE;

	retval = tp3780I_EnableDSP(&pDrvData->rBDData);
	PRINTK_2(TRACE_MWAVE,
		"mwavedd::mwave_init, return from tp3780I_EnableDSP retval %x\n",
		retval);
	if (retval) {
		PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd:mwave_init: Error: Failed to enable DSP\n");
		goto cleanup_error;
	}
	pDrvData->bDSPEnabled = TRUE;

	resultMiscRegister = misc_register(&mwave_misc_dev);
	if (resultMiscRegister < 0) {
		PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd:mwave_init: Error: Failed to register misc device\n");
		goto cleanup_error;
	}
	pDrvData->bMwaveDevRegistered = TRUE;

	pDrvData->sLine = register_serial_portandirq(
		pDrvData->rBDData.rDspSettings.usUartBaseIO,
		pDrvData->rBDData.rDspSettings.usUartIrq
	);
	if (pDrvData->sLine < 0) {
		PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd:mwave_init: Error: Failed to register serial driver\n");
		goto cleanup_error;
	}
	/* uart is registered */

	if (
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
		!create_proc_info_entry("mwave", 0, NULL, mwave_get_info)
#else
		proc_register(&proc_root, &mwave_proc)
#endif
	) {
		PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd::mwave_init: Error: Failed to register /proc/mwave\n");
		goto cleanup_error;
	}
	pDrvData->bProcEntryCreated = TRUE;

	/* SUCCESS! */
	return 0;

	cleanup_error:
	PRINTK_ERROR(KERN_ERR_MWAVE "mwavedd::mwave_init: Error: Failed to initialize\n");
	mwave_exit(); /* clean up */

	return -EIO;
}

module_init(mwave_init);


/*
* proc entry stuff added by Ian Pilcher <[e-mail]>
*/

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
static int mwave_get_info(char *buf, char **start, off_t offset, int len)
{
	DSP_3780I_CONFIG_SETTINGS *pSettings = &mwave_s_mdd.rBDData.rDspSettings;

	char *out = buf;

	out += sprintf(out, "3780i_IRQ %i\n", pSettings->usDspIrq);
	out += sprintf(out, "3780i_DMA %i\n", pSettings->usDspDma);
	out += sprintf(out, "3780i_IO  %#.4x\n", pSettings->usDspBaseIO);
	out += sprintf(out, "UART_IRQ  %i\n", pSettings->usUartIrq);
	out += sprintf(out, "UART_IO   %#.4x\n", pSettings->usUartBaseIO);

	return out - buf;
}
#else /* kernel version < 2.4.0 */
static int mwave_read_proc(char *buf, char **start, off_t offset,
                           int xlen, int unused)
{
	DSP_3780I_CONFIG_SETTINGS *pSettings = &mwave_s_mdd.rBDData.rDspSettings;
	int len;

	len = sprintf(buf,        "3780i_IRQ %i\n", pSettings->usDspIrq);
	len += sprintf(&buf[len], "3780i_DMA %i\n", pSettings->usDspDma);
	len += sprintf(&buf[len], "3780i_IO  %#.4x\n", pSettings->usDspBaseIO);
	len += sprintf(&buf[len], "UART_IRQ  %i\n", pSettings->usUartIrq);
	len += sprintf(&buf[len], "UART_IO   %#.4x\n", pSettings->usUartBaseIO);

	return len;
}
#endif