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authorDavid Altobelli <david.altobelli@hp.com>2009-08-17 19:08:01 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-15 12:50:48 -0400
commit4a351471df352474956f1fdc7bc4e7cf6836503a (patch)
tree974bc0732bf0fc1054421a2cfdf99ca694a7c747 /drivers/misc
parent9f7048412163d8f8175ba01063f3db02d42cc6a7 (diff)
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>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/hpilo.c42
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
index 9a370d5acf87..1ad27c6abcca 100644
--- a/drivers/misc/hpilo.c
+++ b/drivers/misc/hpilo.c
@@ -23,6 +23,7 @@
23#include <linux/uaccess.h> 23#include <linux/uaccess.h>
24#include <linux/io.h> 24#include <linux/io.h>
25#include <linux/wait.h> 25#include <linux/wait.h>
26#include <linux/poll.h>
26#include "hpilo.h" 27#include "hpilo.h"
27 28
28static struct class *ilo_class; 29static struct class *ilo_class;
@@ -102,6 +103,22 @@ static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
102 return ret; 103 return ret;
103} 104}
104 105
106static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
107{
108 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
109 unsigned long flags;
110 int ret = 0;
111 u64 c;
112
113 spin_lock_irqsave(&hw->fifo_lock, flags);
114 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
115 if (c & ENTRY_MASK_C)
116 ret = 1;
117 spin_unlock_irqrestore(&hw->fifo_lock, flags);
118
119 return ret;
120}
121
105static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb, 122static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
106 int dir, int id, int len) 123 int dir, int id, int len)
107{ 124{
@@ -146,6 +163,13 @@ static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
146 return ret; 163 return ret;
147} 164}
148 165
166static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
167{
168 char *fifobar = ccb->ccb_u3.recv_fifobar;
169
170 return fifo_check_recv(hw, fifobar);
171}
172
149static inline void doorbell_set(struct ccb *ccb) 173static inline void doorbell_set(struct ccb *ccb)
150{ 174{
151 iowrite8(1, ccb->ccb_u5.db_base); 175 iowrite8(1, ccb->ccb_u5.db_base);
@@ -486,6 +510,21 @@ static ssize_t ilo_write(struct file *fp, const char __user *buf,
486 return err ? -EFAULT : len; 510 return err ? -EFAULT : len;
487} 511}
488 512
513static unsigned int ilo_poll(struct file *fp, poll_table *wait)
514{
515 struct ccb_data *data = fp->private_data;
516 struct ccb *driver_ccb = &data->driver_ccb;
517
518 poll_wait(fp, &data->ccb_waitq, wait);
519
520 if (is_channel_reset(driver_ccb))
521 return POLLERR;
522 else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
523 return POLLIN | POLLRDNORM;
524
525 return 0;
526}
527
489static int ilo_close(struct inode *ip, struct file *fp) 528static int ilo_close(struct inode *ip, struct file *fp)
490{ 529{
491 int slot; 530 int slot;
@@ -595,6 +634,7 @@ static const struct file_operations ilo_fops = {
595 .owner = THIS_MODULE, 634 .owner = THIS_MODULE,
596 .read = ilo_read, 635 .read = ilo_read,
597 .write = ilo_write, 636 .write = ilo_write,
637 .poll = ilo_poll,
598 .open = ilo_open, 638 .open = ilo_open,
599 .release = ilo_close, 639 .release = ilo_close,
600}; 640};
@@ -835,7 +875,7 @@ static void __exit ilo_exit(void)
835 class_destroy(ilo_class); 875 class_destroy(ilo_class);
836} 876}
837 877
838MODULE_VERSION("1.1"); 878MODULE_VERSION("1.2");
839MODULE_ALIAS(ILO_NAME); 879MODULE_ALIAS(ILO_NAME);
840MODULE_DESCRIPTION(ILO_NAME); 880MODULE_DESCRIPTION(ILO_NAME);
841MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>"); 881MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");