Commit 4a351471 authored by David Altobelli's avatar David Altobelli Committed by Greg Kroah-Hartman
Browse files

hpilo: add poll f_op 



Add poll handler to hpilo, to allow applications a low overhead method
of waiting for data.

Signed-off-by: default avatarDavid Altobelli <david.altobelli@hp.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 9f704841

drivers/misc/hpilo.c

+41 −1
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/uaccess.h>

#include <linux/io.h>

#include <linux/wait.h>

#include <linux/poll.h>

#include "hpilo.h"



static struct class *ilo_class;
@@ -102,6 +103,22 @@ static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry) 
	return ret;

}



static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)

{

	struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);

	unsigned long flags;

	int ret = 0;

	u64 c;



	spin_lock_irqsave(&hw->fifo_lock, flags);

	c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];

	if (c & ENTRY_MASK_C)

		ret = 1;

	spin_unlock_irqrestore(&hw->fifo_lock, flags);



	return ret;

}



static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,

			   int dir, int id, int len)

{
@@ -146,6 +163,13 @@ static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb, 
	return ret;

}



static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)

{

	char *fifobar = ccb->ccb_u3.recv_fifobar;



	return fifo_check_recv(hw, fifobar);

}



static inline void doorbell_set(struct ccb *ccb)

{

	iowrite8(1, ccb->ccb_u5.db_base);
@@ -486,6 +510,21 @@ static ssize_t ilo_write(struct file *fp, const char __user *buf, 
	return err ? -EFAULT : len;

}



static unsigned int ilo_poll(struct file *fp, poll_table *wait)

{

	struct ccb_data *data = fp->private_data;

	struct ccb *driver_ccb = &data->driver_ccb;



	poll_wait(fp, &data->ccb_waitq, wait);



	if (is_channel_reset(driver_ccb))

		return POLLERR;

	else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))

		return POLLIN | POLLRDNORM;



	return 0;

}



static int ilo_close(struct inode *ip, struct file *fp)

{

	int slot;
@@ -595,6 +634,7 @@ static const struct file_operations ilo_fops = { 
	.owner		= THIS_MODULE,

	.read		= ilo_read,

	.write		= ilo_write,

	.poll		= ilo_poll,

	.open 		= ilo_open,

	.release 	= ilo_close,

};
@@ -835,7 +875,7 @@ static void __exit ilo_exit(void) 
	class_destroy(ilo_class);

}



MODULE_VERSION("1.1");

MODULE_VERSION("1.2");

MODULE_ALIAS(ILO_NAME);

MODULE_DESCRIPTION(ILO_NAME);

MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");