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Subject[PATCH 1/2] mailbox: Add ability for clients to request channels by name
Date
This patch supplies a new framework API; mbox_request_channel_byname().

It works by supplying the usual client pointer as the first argument and
a string as the second. The API will search the client's node for a
'mbox-names' property then request a channel in the normal way using the
requested string's index as the expected second 'index' argument.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mailbox/mailbox.c | 29 +++++++++++++++++++++++++++++
include/linux/mailbox_client.h | 2 ++
2 files changed, 31 insertions(+)

diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 19b491d..c533826 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -357,6 +357,35 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index)
}
EXPORT_SYMBOL_GPL(mbox_request_channel);

+struct mbox_chan *mbox_request_channel_byname(struct mbox_client *cl,
+ const char *name)
+{
+ struct device_node *np = cl->dev->of_node;
+ struct property *prop;
+ const char *mbox_name;
+ int index = 0;
+
+ if (!np) {
+ dev_err(cl->dev, "%s() currently only supports DT\n", __func__);
+ return ERR_PTR(-ENOSYS);
+ }
+
+ if (!of_get_property(np, "mbox-names", NULL)) {
+ dev_err(cl->dev,
+ "%s() requires an \"mbox-names\" property\n", __func__);
+ return ERR_PTR(-ENOSYS);
+ }
+
+ of_property_for_each_string(np, "mbox-names", prop, mbox_name) {
+ if (!strncmp(name, mbox_name, strlen(name)))
+ break;
+ index++;
+ }
+
+ return mbox_request_channel(cl, index);
+}
+EXPORT_SYMBOL_GPL(mbox_request_channel_byname);
+
/**
* mbox_free_channel - The client relinquishes control of a mailbox
* channel by this call.
diff --git a/include/linux/mailbox_client.h b/include/linux/mailbox_client.h
index 1726ccb..4434871 100644
--- a/include/linux/mailbox_client.h
+++ b/include/linux/mailbox_client.h
@@ -40,6 +40,8 @@ struct mbox_client {
void (*tx_done)(struct mbox_client *cl, void *mssg, int r);
};

+struct mbox_chan *mbox_request_channel_byname(struct mbox_client *cl,
+ const char *name);
struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index);
int mbox_send_message(struct mbox_chan *chan, void *mssg);
void mbox_client_txdone(struct mbox_chan *chan, int r); /* atomic */
--
1.9.1


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