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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: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Lee Jones 2015-05-11 17:08:50 +01:00 committed by Jassi Brar
parent 0bae6af6d7
commit dfabde206a
2 changed files with 31 additions and 0 deletions
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29
drivers/mailbox/mailbox.c
View File

@ -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.

2
include/linux/mailbox_client.h
View File

@ -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 */