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hpilo: add poll f_op

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

Signed-off-by: David Altobelli <david.altobelli@hp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Altobelli 2009-08-17 17:08:01 -06:00 committed by Greg Kroah-Hartman
parent 9f70484121
commit 4a351471df
1 changed files with 41 additions and 1 deletions
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42
drivers/misc/hpilo.c
View file

@ -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>");