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/*
* Greybus interface code
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include "greybus.h"
/* interface sysfs attributes */
#define gb_interface_attr(field, type) \
static ssize_t field##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct gb_interface *intf = to_gb_interface(dev); \
return sprintf(buf, "%"#type"\n", intf->field); \
} \
static DEVICE_ATTR_RO(field)
gb_interface_attr(vendor, x);
gb_interface_attr(product, x);
gb_interface_attr(unique_id, llX);
gb_interface_attr(vendor_string, s);
gb_interface_attr(product_string, s);
static struct attribute *interface_attrs[] = {
&dev_attr_vendor.attr,
&dev_attr_product.attr,
&dev_attr_unique_id.attr,
&dev_attr_vendor_string.attr,
&dev_attr_product_string.attr,
NULL,
};
ATTRIBUTE_GROUPS(interface);
/* XXX This could be per-host device */
static DEFINE_SPINLOCK(gb_interfaces_lock);
// FIXME, odds are you don't want to call this function, rework the caller to
// not need it please.
struct gb_interface *gb_interface_find(struct greybus_host_device *hd,
u8 interface_id)
{
struct gb_interface *intf;
list_for_each_entry(intf, &hd->interfaces, links)
if (intf->interface_id == interface_id)
return intf;
return NULL;
}
static void greybus_interface_release(struct device *dev)
{
struct gb_interface *intf = to_gb_interface(dev);
kfree(intf);
}
struct device_type greybus_interface_type = {
.name = "greybus_interface",
.release = greybus_interface_release,
};
/*
* A Greybus module represents a user-replicable component on an Ara
* phone. An interface is the physical connection on that module. A
* module may have more than one interface.
*
* Create a gb_interface structure to represent a discovered interface.
* The position of interface within the Endo is encoded in "interface_id"
* argument.
*
* Returns a pointer to the new interfce or a null pointer if a
* failure occurs due to memory exhaustion.
*/
static struct gb_interface *gb_interface_create(struct greybus_host_device *hd,
u8 interface_id)
{
struct gb_module *module;
struct gb_interface *intf;
int retval;
intf = gb_interface_find(hd, interface_id);
if (intf) {
dev_err(hd->parent, "Duplicate interface with interface-id: %d will not be created\n",
interface_id);
return NULL;
}
module = gb_module_find(hd, get_module_id(interface_id));
if (!module)
return NULL;
intf = kzalloc(sizeof(*intf), GFP_KERNEL);
if (!intf)
goto put_module;
intf->hd = hd; /* XXX refcount? */
intf->module = module;
intf->interface_id = interface_id;
INIT_LIST_HEAD(&intf->bundles);
INIT_LIST_HEAD(&intf->manifest_descs);
intf->dev.parent = &module->dev;
intf->dev.bus = &greybus_bus_type;
intf->dev.type = &greybus_interface_type;
intf->dev.groups = interface_groups;
intf->dev.dma_mask = hd->parent->dma_mask;
device_initialize(&intf->dev);
dev_set_name(&intf->dev, "%s:%d", dev_name(&module->dev), interface_id);
retval = device_add(&intf->dev);
if (retval) {
pr_err("failed to add interface device for id 0x%02hhx\n",
interface_id);
goto free_intf;
}
spin_lock_irq(&gb_interfaces_lock);
list_add_tail(&intf->links, &hd->interfaces);
spin_unlock_irq(&gb_interfaces_lock);
return intf;
free_intf:
put_device(&intf->dev);
kfree(intf);
put_module:
put_device(&module->dev);
return NULL;
}
/*
* Tear down a previously set up module.
*/
static void gb_interface_destroy(struct gb_interface *intf)
{
struct gb_module *module;
if (WARN_ON(!intf))
return;
spin_lock_irq(&gb_interfaces_lock);
list_del(&intf->links);
spin_unlock_irq(&gb_interfaces_lock);
gb_bundle_destroy(intf);
kfree(intf->product_string);
kfree(intf->vendor_string);
/* kref_put(module->hd); */
module = intf->module;
device_unregister(&intf->dev);
put_device(&module->dev);
}
/**
* gb_add_interface
*
* Pass in a buffer that _should_ contain a Greybus manifest
* and register a greybus device structure with the kernel core.
*/
void gb_add_interface(struct greybus_host_device *hd, u8 interface_id, u8 *data,
int size)
{
struct gb_interface *intf;
intf = gb_interface_create(hd, interface_id);
if (!intf) {
dev_err(hd->parent, "failed to create interface\n");
return;
}
/*
* Parse the manifest and build up our data structures
* representing what's in it.
*/
if (!gb_manifest_parse(intf, data, size)) {
dev_err(hd->parent, "manifest error\n");
goto err_parse;
}
/*
* XXX
* We've successfully parsed the manifest. Now we need to
* allocate CPort Id's for connecting to the CPorts found on
* other modules. For each of these, establish a connection
* between the local and remote CPorts (including
* configuring the switch to allow them to communicate).
*/
return;
err_parse:
gb_interface_destroy(intf);
}
void gb_remove_interface(struct greybus_host_device *hd, u8 interface_id)
{
struct gb_interface *intf = gb_interface_find(hd, interface_id);
if (intf)
gb_interface_destroy(intf);
else
dev_err(hd->parent, "interface id %d not found\n",
interface_id);
}
void gb_remove_interfaces(struct greybus_host_device *hd)
{
struct gb_interface *intf, *temp;
list_for_each_entry_safe(intf, temp, &hd->interfaces, links)
gb_interface_destroy(intf);
}
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