msm: sdio_ctl: Update the driver to support poll operation
Poll operation is needed by user-space modules, to select among
multiple file descriptors for read/write operation.
CRs-Fixed: 357121
Change-Id: Iaa817c31bdfee7a1fcb3c5e94a805a526b71cd6c
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
diff --git a/arch/arm/mach-msm/sdio_ctl.c b/arch/arm/mach-msm/sdio_ctl.c
index 586e890..ac16e77 100644
--- a/arch/arm/mach-msm/sdio_ctl.c
+++ b/arch/arm/mach-msm/sdio_ctl.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+/* Copyright (c) 2010-2012, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -25,6 +25,7 @@
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/workqueue.h>
+#include <linux/poll.h>
#include <asm/ioctls.h>
#include <linux/platform_device.h>
#include <mach/msm_smd.h>
@@ -206,6 +207,34 @@
return ret;
}
+static unsigned int sdio_ctl_poll(struct file *file, poll_table *wait)
+{
+ struct sdio_ctl_dev *sdio_ctl_devp;
+ unsigned int mask = 0;
+
+ sdio_ctl_devp = file->private_data;
+ if (!sdio_ctl_devp) {
+ pr_err("%s: on a NULL device\n", __func__);
+ return POLLERR;
+ }
+
+ poll_wait(file, &sdio_ctl_devp->read_wait_queue, wait);
+ mutex_lock(&sdio_ctl_devp->rx_lock);
+ if (sdio_cmux_is_channel_reset(sdio_ctl_devp->id)) {
+ mutex_unlock(&sdio_ctl_devp->rx_lock);
+ pr_err("%s notifying reset for sdio_ctl_dev id:%d\n",
+ __func__, sdio_ctl_devp->id);
+ return POLLERR;
+ }
+
+ if (sdio_ctl_devp->read_avail > 0)
+ mask |= POLLIN | POLLRDNORM;
+
+ mutex_unlock(&sdio_ctl_devp->rx_lock);
+
+ return mask;
+}
+
ssize_t sdio_ctl_read(struct file *file,
char __user *buf,
size_t count,
@@ -417,6 +446,7 @@
.release = sdio_ctl_release,
.read = sdio_ctl_read,
.write = sdio_ctl_write,
+ .poll = sdio_ctl_poll,
.unlocked_ioctl = sdio_ctl_ioctl,
};