#define RAW1394_IOC_GET_CYCLE_TIMER		\

	_IOR ('#', 0x30, struct _raw1394_cycle_timer)

#include <linux/preempt.h>

#include <linux/time.h>

#include <asm/system.h>

/**

 * hpsb_read_cycle_timer - read cycle timer register and system time

 * @host: host whose isochronous cycle timer register is read

 * @cycle_timer: address of bitfield to return the register contents

 * @local_time: address to return the system time

 *

 * The format of * @cycle_timer, is described in OHCI 1.1 clause 5.13. This

 * format is also read from non-OHCI controllers. * @local_time contains the

 * system time in microseconds since the Epoch, read at the moment when the

 * cycle timer was read.

 *

 * Return value: 0 for success or error number otherwise.

 */

int hpsb_read_cycle_timer(struct hpsb_host *host, u32 *cycle_timer,

			  u64 *local_time)

{

	int ctr;

	struct timeval tv;

	unsigned long flags;

	if (!host || !cycle_timer || !local_time)

		return -EINVAL;

	preempt_disable();

	local_irq_save(flags);

	ctr = host->driver->devctl(host, GET_CYCLE_COUNTER, 0);

	if (ctr)

		do_gettimeofday(&tv);

	local_irq_restore(flags);

	preempt_enable();

	if (!ctr)

		return -EIO;

	*cycle_timer = ctr;

	*local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;

	return 0;

}

EXPORT_SYMBOL(hpsb_read_cycle_timer);

int hpsb_read_cycle_timer(struct hpsb_host *host, u32 *cycle_timer,

			  u64 *local_time);

static int raw1394_read_cycle_timer(struct file_info *fi, void __user * uaddr)

{

	struct _raw1394_cycle_timer ct;

	int err;

	err = hpsb_read_cycle_timer(fi->host, &ct.cycle_timer, &ct.local_time);

	if (!err)

		if (copy_to_user(uaddr, &ct, sizeof(ct)))

			err = -EFAULT;

	return err;

}

	/* state-independent commands */

	switch(cmd) {

	case RAW1394_IOC_GET_CYCLE_TIMER:

		return raw1394_read_cycle_timer(fi, argp);

	default:

		break;

	}

/* argument to RAW1394_IOC_GET_CYCLE_TIMER ioctl */

struct _raw1394_cycle_timer {

	/* contents of Isochronous Cycle Timer register,

	   as in OHCI 1.1 clause 5.13 (also with non-OHCI hosts) */

	__u32 cycle_timer;

	/* local time in microseconds since Epoch,

	   simultaneously read with cycle timer */

	__u64 local_time;

};