hpilo: add poll f_op

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>

diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
index 9a370d5..1ad27c6 100644 (file)
--- a/drivers/misc/hpilo.c
+++ b/drivers/misc/hpilo.c
@@ -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>");