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Commit dfabde20 authored by Lee Jones's avatar Lee Jones Committed by Jassi Brar
Browse files

mailbox: Add ability for clients to request channels by name 



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: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarJassi Brar <jaswinder.singh@linaro.org>
parent 0bae6af6

drivers/mailbox/mailbox.c

+29 −0
Original line number Diff line number Diff line
@@ -362,6 +362,35 @@ 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.

include/linux/mailbox_client.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */