From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758355AbdAKWeo (ORCPT ); Wed, 11 Jan 2017 17:34:44 -0500 Received: from mail-pf0-f180.google.com ([209.85.192.180]:33027 "EHLO mail-pf0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757759AbdAKWej (ORCPT ); Wed, 11 Jan 2017 17:34:39 -0500 From: Bjorn Andersson To: Ohad Ben-Cohen , Bjorn Andersson Cc: linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: [PATCH v3 2/4] rpmsg: qcom_smd: Implement endpoint "poll" Date: Wed, 11 Jan 2017 06:35:11 -0800 Message-Id: <20170111143513.32251-2-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170111143513.32251-1-bjorn.andersson@linaro.org> References: <20170111143513.32251-1-bjorn.andersson@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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