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omap mailbox: Set a device in logical mbox instance for traceability

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With this patch, you'll get the following sysfs directories. This
structure implies that a single platform device, "omap2-mailbox" holds
multiple logical mbox instances. This could be the base to add sysfs
files for each logical mboxes. Then userland application can access a
mbox through sysfs entries if necessary(ex: setting kfifo size
dynamically)

  ~# tree -d -L 2 /sys/devices/platform/omap2-mailbox/
  /sys/devices/platform/omap2-mailbox/
  |-- driver -> ../../../bus/platform/drivers/omap2-mailbox
  |-- mbox
  |   |-- dsp      <- they are each instances of logical mailbox.
  |   |-- ducati
  |   |-- iva2
  |   |-- mbox01
  |   |-- mbox02
  |   |-- mbox03
  |   |-- .....
  |   `-- tesla
  |-- power
  `-- subsystem -> ../../../bus/platform

This was wrongly dropped by:
     commit c7c158e57b

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
This commit is contained in:
Hiroshi DOYU 2010-05-18 16:15:32 +03:00
parent b5bebe4102
commit 6b23398591
1 changed files with 16 additions and 1 deletions
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17
arch/arm/plat-omap/mailbox.c
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@ -347,6 +347,8 @@ void omap_mbox_put(struct omap_mbox *mbox)
}
EXPORT_SYMBOL(omap_mbox_put);
static struct class omap_mbox_class = { .name = "mbox", };
int omap_mbox_register(struct device *parent, struct omap_mbox *mbox)
{
int ret = 0;
@ -357,6 +359,11 @@ int omap_mbox_register(struct device *parent, struct omap_mbox *mbox)
if (mbox->next)
return -EBUSY;
mbox->dev = device_create(&omap_mbox_class,
parent, 0, mbox, "%s", mbox->name);
if (IS_ERR(mbox->dev))
return PTR_ERR(mbox->dev);
spin_lock(&mboxes_lock);
tmp = find_mboxes(mbox->name);
if (*tmp) {
@ -385,6 +392,7 @@ int omap_mbox_unregister(struct omap_mbox *mbox)
*tmp = mbox->next;
mbox->next = NULL;
spin_unlock(&mboxes_lock);
device_unregister(mbox->dev);
return 0;
}
tmp = &(*tmp)->next;
@ -397,6 +405,12 @@ EXPORT_SYMBOL(omap_mbox_unregister);
static int __init omap_mbox_init(void)
{
int err;
err = class_register(&omap_mbox_class);
if (err)
return err;
mboxd = create_workqueue("mboxd");
if (!mboxd)
return -ENOMEM;
@ -407,11 +421,12 @@ static int __init omap_mbox_init(void)
return 0;
}
module_init(omap_mbox_init);
subsys_initcall(omap_mbox_init);
static void __exit omap_mbox_exit(void)
{
destroy_workqueue(mboxd);
class_unregister(&omap_mbox_class);
}
module_exit(omap_mbox_exit);