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authorBjorn Andersson <bjorn.andersson@linaro.org>2017-01-11 17:35:11 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2017-01-18 21:43:15 +0300
commitadaa11b02c34ebbcaa7dff43f9cfadd4a9a226fd (patch)
tree0adc2490ec36111f4c2ae985359ad4f5db7f86c6 /drivers/rpmsg
parent84d58132d285b2edef951d6633c1e5224e8b5283 (diff)
downloadlinux-adaa11b02c34ebbcaa7dff43f9cfadd4a9a226fd.tar.xz
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: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/rpmsg')
-rw-r--r--drivers/rpmsg/qcom_smd.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index 3dd73edaa525..9e2af6a18aa2 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -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,
};
/*