linux-kernel - [PATCH v2 4/7] soc: qcom: smd: Support multiple channels per sdev

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Message-ID: <1444423685-14717-5-git-send-email-bjorn.andersson@sonymobile.com>
Date:	Fri, 9 Oct 2015 13:48:02 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Andy Gross <agross@...eaurora.org>
CC:	<linux-arm-msm@...r.kernel.org>, <linux-soc@...r.kernel.org>,
	Fengwei Yin <fengwei.yin@...aro.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v2 4/7] soc: qcom: smd: Support multiple channels per sdev

This patch allows chaining additional channels to a SMD device, enabling
implementation of multi-channel SMD devies - like Bluetooth.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
---

Changes since v1:
- New patch

 drivers/soc/qcom/smd.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/qcom/smd.c b/drivers/soc/qcom/smd.c
index 669bda585dad..4c55708aac50 100644
--- a/drivers/soc/qcom/smd.c
+++ b/drivers/soc/qcom/smd.c
@@ -193,6 +193,7 @@ struct qcom_smd_channel {
 	int pkt_size;
 
 	struct list_head list;
+	struct list_head dev_list;
 };
 
 /**
@@ -885,6 +886,8 @@ static int qcom_smd_dev_remove(struct device *dev)
 	struct qcom_smd_device *qsdev = to_smd_device(dev);
 	struct qcom_smd_driver *qsdrv = to_smd_driver(dev);
 	struct qcom_smd_channel *channel = qsdev->channel;
+	struct qcom_smd_channel *tmp;
+	struct qcom_smd_channel *ch;
 
 	qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSING);
 
@@ -904,10 +907,14 @@ static int qcom_smd_dev_remove(struct device *dev)
 		qsdrv->remove(qsdev);
 
 	/*
-	 * The client is now gone, cleanup and reset the channel state.
+	 * The client is now gone, close and release all channels associated
+	 * with this sdev
 	 */
-	channel->qsdev = NULL;
-	qcom_smd_channel_close(channel);
+	list_for_each_entry_safe(ch, tmp, &channel->dev_list, dev_list) {
+		qcom_smd_channel_close(ch);
+		list_del(&ch->dev_list);
+		ch->qsdev = NULL;
+	}
 
 	return 0;
 }
@@ -1056,6 +1063,7 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed
 	if (!channel)
 		return ERR_PTR(-ENOMEM);
 
+	INIT_LIST_HEAD(&channel->dev_list);
 	channel->edge = edge;
 	channel->name = devm_kstrdup(smd->dev, name, GFP_KERNEL);
 	if (!channel->name)
-- 
2.4.2

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