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    Subject[PATCH 3/3] hpilo: add poll f_op
    Add poll handler to hpilo, to allow applications a low overhead method 
    of waiting for data.

    Please CC me on any replies.

    Signed-off-by: David Altobelli <david.altobelli@hp.com>
    ---
    hpilo.c | 42 +++++++++++++++++++++++++++++++++++++++++-
    1 file changed, 41 insertions(+), 1 deletion(-)
    --- linux-2.6.30.3/drivers/misc/hpilo.c.orig 2009-08-07 09:40:48.000000000 -0500
    +++ linux-2.6.30.3/drivers/misc/hpilo.c 2009-08-07 09:41:10.000000000 -0500
    @@ -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_hwinf
    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_hw
    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
    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_
    .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>");

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