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greybus: manifest cport descriptor parsing 

Add support for parsing one or more cports descriptors in a module
manifest.  There must be at least one for each interface, but we impose
no limit on the number of interfaces associated with a module.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
This commit is contained in:
Alex Elder 2014-10-01 21:54:18 -05:00 committed by Greg Kroah-Hartman
parent d88bfb5b7d
commit c095bbcfcb
1 changed files with 48 additions and 0 deletions
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48
drivers/staging/greybus/manifest.c
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@ -171,6 +171,49 @@ static char *gb_string_get(u8 string_id)
return string;
}
/*
* Find cport descriptors in the manifest and set up data structures
* for the functions that use them. Returns the number of interfaces
* set up for the given module, or 0 if there is an error.
*/
u32 gb_manifest_parse_cports(struct gb_interface *interface)
{
u32 count = 0;
while (true) {
struct manifest_desc *descriptor;
struct greybus_descriptor_cport *desc_cport;
enum greybus_function_type function_type;
u16 cport_id;
bool found;
/* Find a cport descriptor */
found = false;
list_for_each_entry(descriptor, &manifest_descs, links) {
if (descriptor->type == GREYBUS_TYPE_CPORT) {
found = true;
break;
}
}
if (!found)
break;
/* Found one. Set up its function structure */
desc_cport = descriptor->data;
function_type =
(enum greybus_function_type)desc_cport->function_type;
cport_id = le16_to_cpu(desc_cport->id);
if (!gb_function_create(interface, cport_id, function_type))
return 0; /* Error */
count++;
/* Release the cport descriptor */
release_manifest_descriptor(descriptor);
}
return count;
}
/*
* Find interface descriptors in the manifest and set up their data
* structures. Returns the number of interfaces set up for the
@ -201,6 +244,11 @@ static u32 gb_manifest_parse_interfaces(struct gb_module *gmod)
interface = gb_interface_create(gmod, desc_interface->id);
if (!interface)
return 0; /* Error */
/* Now go set up this interface's functions and cports */
if (!gb_manifest_parse_cports(interface))
return 0; /* Error parsing cports */
count++;
/* Done with this interface descriptor */