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Commit adaa11b0 authored by Bjorn Andersson's avatar Bjorn Andersson
Browse files

rpmsg: qcom_smd: Implement endpoint "poll" 



Add support for polling the status of the write buffer so that user
space can use rpmsg character devices in non-blocking mode.

Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent 84d58132

drivers/rpmsg/qcom_smd.c

+16 −0
Original line number Diff line number Diff line
@@ -919,6 +919,21 @@ static int qcom_smd_trysend(struct rpmsg_endpoint *ept, void *data, int len) 
	return __qcom_smd_send(qsept->qsch, data, len, false);

}



static unsigned int qcom_smd_poll(struct rpmsg_endpoint *ept,

				  struct file *filp, poll_table *wait)

{

	struct qcom_smd_endpoint *qsept = to_smd_endpoint(ept);

	struct qcom_smd_channel *channel = qsept->qsch;

	unsigned int mask = 0;



	poll_wait(filp, &channel->fblockread_event, wait);



	if (qcom_smd_get_tx_avail(channel) > 20)

		mask |= POLLOUT | POLLWRNORM;



	return mask;

}



/*

 * Finds the device_node for the smd child interested in this channel.

 */
@@ -951,6 +966,7 @@ static const struct rpmsg_endpoint_ops qcom_smd_endpoint_ops = { 
	.destroy_ept = qcom_smd_destroy_ept,

	.send = qcom_smd_send,

	.trysend = qcom_smd_trysend,

	.poll = qcom_smd_poll,

};



/*