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Commit 011248bc authored by Arun Kumar Neelakantam's avatar Arun Kumar Neelakantam
Browse files

char: msm_smd_pkt: Add POLLPRI support for signal update 



Clients in user space need a notification mechanism when SMD channel
signals are modified by the remote side instead of calling IOCTL everytime.

Change in signal status are notified to client over POLL with POLLPRI mask.

CRs-Fixed: 2210083
Change-Id: I4b50b053a9af93b853cff46fb8d35c320e608aab
Signed-off-by: default avatarArun Kumar Neelakantam <aneela@codeaurora.org>
parent ccf21f85

drivers/char/msm_smd_pkt.c

+18 −3
Original line number Diff line number Diff line 
/* Copyright (c) 2008-2017, The Linux Foundation. All rights reserved.

/* Copyright (c) 2008-2018, The Linux Foundation. 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
@@ -76,6 +76,8 @@ struct smd_pkt_dev { 
	struct work_struct packet_arrival_work;

	spinlock_t pa_spinlock;

	int ws_locked;



	int sigs_updated;

};
@@ -356,9 +358,12 @@ static long smd_pkt_ioctl(struct file *file, unsigned int cmd, 
	mutex_lock(&smd_pkt_devp->ch_lock);

	switch (cmd) {

	case TIOCMGET:

		D_STATUS("%s TIOCMGET command on smd_pkt_dev id:%d\n",

			 __func__, smd_pkt_devp->i);

		smd_pkt_devp->sigs_updated = false;

		ret = smd_tiocmget(smd_pkt_devp->ch);

		D_STATUS("%s TIOCMGET command on smd_pkt_dev id:%d [%d]\n",

			 __func__, smd_pkt_devp->i, ret);

		if (ret > 0)

			ret = put_user((uint32_t)ret, (uint32_t __user *)arg);

		break;

	case TIOCMSET:

		ret = get_user(val, (uint32_t *)arg);
@@ -668,6 +673,12 @@ static unsigned int smd_pkt_poll(struct file *file, poll_table *wait) 
		D_POLL("%s sets POLLIN for smd_pkt_dev id: %d\n",

			__func__, smd_pkt_devp->i);

	}



	if (smd_pkt_devp->sigs_updated) {

		mask |= POLLPRI;

		D_POLL("%s sets POLLPRI for smd_pkt_dev id: %d\n",

			__func__, smd_pkt_devp->i);

	}

	mutex_unlock(&smd_pkt_devp->ch_lock);



	return mask;
@@ -773,6 +784,9 @@ static void ch_notify(void *priv, unsigned int event) 
			schedule_delayed_work(&loopback_work,

					msecs_to_jiffies(1000));

		break;

	case SMD_EVENT_STATUS:

		smd_pkt_devp->sigs_updated = true;

		break;

	}

}
@@ -1099,6 +1113,7 @@ int smd_pkt_release(struct inode *inode, struct file *file) 
			smd_pkt_devp->ws_locked = 0;

		}

		spin_unlock_irqrestore(&smd_pkt_devp->pa_spinlock, flags);

		smd_pkt_devp->sigs_updated = false;

	}

	mutex_unlock(&smd_pkt_devp->tx_lock);

	mutex_unlock(&smd_pkt_devp->rx_lock);