diff options
Diffstat (limited to 'drivers/mailbox/mailbox.c')
| -rw-r--r-- | drivers/mailbox/mailbox.c | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 19b491d2964f..c7fdb57fd166 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -318,7 +318,7 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index) return ERR_PTR(-ENODEV); } - chan = NULL; + chan = ERR_PTR(-EPROBE_DEFER); list_for_each_entry(mbox, &mbox_cons, node) if (mbox->dev->of_node == spec.np) { chan = mbox->of_xlate(mbox, &spec); @@ -327,7 +327,12 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index) of_node_put(spec.np); - if (!chan || chan->cl || !try_module_get(mbox->dev->driver->owner)) { + if (IS_ERR(chan)) { + mutex_unlock(&con_mutex); + return chan; + } + + if (chan->cl || !try_module_get(mbox->dev->driver->owner)) { dev_dbg(dev, "%s: mailbox not free\n", __func__); mutex_unlock(&con_mutex); return ERR_PTR(-EBUSY); @@ -357,6 +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. @@ -390,7 +424,7 @@ of_mbox_index_xlate(struct mbox_controller *mbox, int ind = sp->args[0]; if (ind >= mbox->num_chans) - return NULL; + return ERR_PTR(-EINVAL); return &mbox->chans[ind]; } |