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/*
* Greybus interface block code
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include "greybus.h"
/* interface block sysfs attributes */
#define gb_ib_attr(field, type) \
static ssize_t field##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct gb_interface_block *gb_ib = to_gb_interface_block(dev); \
return sprintf(buf, "%"#type"\n", gb_ib->field); \
} \
static DEVICE_ATTR_RO(field)
gb_ib_attr(vendor, x);
gb_ib_attr(product, x);
gb_ib_attr(unique_id, llX);
gb_ib_attr(vendor_string, s);
gb_ib_attr(product_string, s);
static struct attribute *interface_block_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_block);
/* XXX This could be per-host device */
static DEFINE_SPINLOCK(gb_modules_lock);
static int gb_ib_match_one_id(struct gb_interface_block *gb_ib,
const struct greybus_interface_block_id *id)
{
if ((id->match_flags & GREYBUS_ID_MATCH_VENDOR) &&
(id->vendor != gb_ib->vendor))
return 0;
if ((id->match_flags & GREYBUS_ID_MATCH_PRODUCT) &&
(id->product != gb_ib->product))
return 0;
if ((id->match_flags & GREYBUS_ID_MATCH_SERIAL) &&
(id->unique_id != gb_ib->unique_id))
return 0;
return 1;
}
const struct greybus_interface_block_id *
gb_ib_match_id(struct gb_interface_block *gb_ib,
const struct greybus_interface_block_id *id)
{
if (id == NULL)
return NULL;
for (; id->vendor || id->product || id->unique_id ||
id->driver_info; id++) {
if (gb_ib_match_one_id(gb_ib, id))
return id;
}
return NULL;
}
struct gb_interface_block *gb_ib_find(struct greybus_host_device *hd, u8 module_id)
{
struct gb_interface_block *gb_ib;
list_for_each_entry(gb_ib, &hd->modules, links)
if (gb_ib->module_id == module_id)
return gb_ib;
return NULL;
}
static void greybus_ib_release(struct device *dev)
{
struct gb_interface_block *gb_ib = to_gb_interface_block(dev);
kfree(gb_ib);
}
struct device_type greybus_interface_block_type = {
.name = "greybus_interface_block",
.release = greybus_ib_release,
};
/*
* A Greybus module represents a user-replicable component on an Ara
* phone. An interface block is the physical connection on that module. A
* module may have more than one interface block.
*
* Create a gb_interface_block structure to represent a discovered module.
* The position within the Endo is encoded in the "module_id" argument.
* Returns a pointer to the new module or a null pointer if a
* failure occurs due to memory exhaustion.
*/
static struct gb_interface_block *gb_ib_create(struct greybus_host_device *hd,
u8 module_id)
{
struct gb_interface_block *gb_ib;
int retval;
gb_ib = gb_ib_find(hd, module_id);
if (gb_ib) {
dev_err(hd->parent, "Duplicate module id %d will not be created\n",
module_id);
return NULL;
}
gb_ib = kzalloc(sizeof(*gb_ib), GFP_KERNEL);
if (!gb_ib)
return NULL;
gb_ib->hd = hd; /* XXX refcount? */
gb_ib->module_id = module_id;
INIT_LIST_HEAD(&gb_ib->interfaces);
gb_ib->dev.parent = hd->parent;
gb_ib->dev.bus = &greybus_bus_type;
gb_ib->dev.type = &greybus_interface_block_type;
gb_ib->dev.groups = interface_block_groups;
gb_ib->dev.dma_mask = hd->parent->dma_mask;
device_initialize(&gb_ib->dev);
dev_set_name(&gb_ib->dev, "%d", module_id);
retval = device_add(&gb_ib->dev);
if (retval) {
pr_err("failed to add module device for id 0x%02hhx\n",
module_id);
put_device(&gb_ib->dev);
kfree(gb_ib);
return NULL;
}
spin_lock_irq(&gb_modules_lock);
list_add_tail(&gb_ib->links, &hd->modules);
spin_unlock_irq(&gb_modules_lock);
return gb_ib;
}
/*
* Tear down a previously set up module.
*/
static void gb_ib_destroy(struct gb_interface_block *gb_ib)
{
if (WARN_ON(!gb_ib))
return;
spin_lock_irq(&gb_modules_lock);
list_del(&gb_ib->links);
spin_unlock_irq(&gb_modules_lock);
gb_bundle_destroy(gb_ib);
kfree(gb_ib->product_string);
kfree(gb_ib->vendor_string);
/* kref_put(module->hd); */
device_del(&gb_ib->dev);
}
/**
* gb_add_module
*
* Pass in a buffer that _should_ contain a Greybus module manifest
* and register a greybus device structure with the kernel core.
*/
void gb_add_module(struct greybus_host_device *hd, u8 module_id,
u8 *data, int size)
{
struct gb_interface_block *gb_ib;
gb_ib = gb_ib_create(hd, module_id);
if (!gb_ib) {
dev_err(hd->parent, "failed to create interface block\n");
return;
}
/*
* Parse the manifest and build up our data structures
* representing what's in it.
*/
if (!gb_manifest_parse(gb_ib, data, size)) {
dev_err(hd->parent, "manifest error\n");
goto err_module;
}
/*
* 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_module:
gb_ib_destroy(gb_ib);
}
void gb_remove_module(struct greybus_host_device *hd, u8 module_id)
{
struct gb_interface_block *gb_ib = gb_ib_find(hd, module_id);
if (gb_ib)
gb_ib_destroy(gb_ib);
else
dev_err(hd->parent, "interface block id %d not found\n", module_id);
}
void gb_remove_modules(struct greybus_host_device *hd)
{
struct gb_interface_block *gb_ib, *temp;
list_for_each_entry_safe(gb_ib, temp, &hd->modules, links)
gb_ib_destroy(gb_ib);
}
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