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@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

diff --git a/drivers/soc/qcom/smd.c b/drivers/soc/qcom/smd.c
index d253e5c..c3fa0fd 100644 (file)
--- 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;
 };
 
 /**
@@ -887,6 +888,8 @@ 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);
 
@@ -906,10 +909,14 @@ 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)