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 <[email protected]> --- Changes since v2: - None Changes since v1: - New patch drivers/rpmsg/qcom_smd.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) 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, }; /* -- 2.11.0
