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rpmsg: qcom_smd: Implement endpoint "poll"

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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: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson 2017-01-11 06:35:11 -08:00
parent 84d58132d2
commit adaa11b02c
1 changed files with 16 additions and 0 deletions
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16
drivers/rpmsg/qcom_smd.c
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@ -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,
};
/*