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/*
* Greybus modules
*
* Copyright 2014 Google Inc.
*
* Released under the GPLv2 only.
*/
#include "greybus.h"
/* XXX This could be per-host device */
static DEFINE_SPINLOCK(gb_modules_lock);
static int gb_module_match_one_id(struct gb_module *gmod,
const struct greybus_module_id *id)
{
if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_VENDOR) &&
(id->vendor != gmod->vendor))
return 0;
if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_PRODUCT) &&
(id->product != gmod->product))
return 0;
if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_SERIAL) &&
(id->unique_id != gmod->unique_id))
return 0;
return 1;
}
const struct greybus_module_id *gb_module_match_id(struct gb_module *gmod,
const struct greybus_module_id *id)
{
if (id == NULL)
return NULL;
for (; id->vendor || id->product || id->unique_id ||
id->driver_info; id++) {
if (gb_module_match_one_id(gmod, id))
return id;
}
return NULL;
}
struct gb_module *gb_module_find(struct greybus_host_device *hd, u8 module_id)
{
struct gb_module *module;
list_for_each_entry(module, &hd->modules, links)
if (module->module_id == module_id)
return module;
return NULL;
}
static void greybus_module_release(struct device *dev)
{
struct gb_module *gmod = to_gb_module(dev);
kfree(gmod);
}
struct device_type greybus_module_type = {
.name = "greybus_module",
.release = greybus_module_release,
};
/*
* A Greybus module represents a user-replacable component on an Ara
* phone.
*
* Create a gb_module 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.
*/
struct gb_module *gb_module_create(struct greybus_host_device *hd, u8 module_id)
{
struct gb_module *gmod;
int retval;
gmod = gb_module_find(hd, module_id);
if (gmod) {
dev_err(hd->parent, "Duplicate module id %d will not be created\n",
module_id);
return NULL;
}
gmod = kzalloc(sizeof(*gmod), GFP_KERNEL);
if (!gmod)
return NULL;
gmod->hd = hd; /* XXX refcount? */
gmod->module_id = module_id;
INIT_LIST_HEAD(&gmod->interfaces);
gmod->dev.parent = hd->parent;
gmod->dev.bus = &greybus_bus_type;
gmod->dev.type = &greybus_module_type;
gmod->dev.groups = greybus_module_groups;
gmod->dev.dma_mask = hd->parent->dma_mask;
device_initialize(&gmod->dev);
dev_set_name(&gmod->dev, "%d", module_id);
retval = device_add(&gmod->dev);
if (retval) {
pr_err("failed to add module device for id 0x%02hhx\n",
module_id);
put_device(&gmod->dev);
kfree(gmod);
return NULL;
}
spin_lock_irq(&gb_modules_lock);
list_add_tail(&gmod->links, &hd->modules);
spin_unlock_irq(&gb_modules_lock);
return gmod;
}
/*
* Tear down a previously set up module.
*/
void gb_module_destroy(struct gb_module *gmod)
{
if (WARN_ON(!gmod))
return;
spin_lock_irq(&gb_modules_lock);
list_del(&gmod->links);
spin_unlock_irq(&gb_modules_lock);
/* XXX Do something with gmod->gb_tty */
gb_interface_destroy(gmod);
kfree(gmod->product_string);
kfree(gmod->vendor_string);
/* kref_put(module->hd); */
device_del(&gmod->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_module *gmod;
gmod = gb_module_create(hd, module_id);
if (!gmod) {
dev_err(hd->parent, "failed to create module\n");
return;
}
/*
* Parse the manifest and build up our data structures
* representing what's in it.
*/
if (!gb_manifest_parse(gmod, 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_module_destroy(gmod);
}
void gb_remove_module(struct greybus_host_device *hd, u8 module_id)
{
struct gb_module *gmod = gb_module_find(hd, module_id);
if (gmod)
gb_module_destroy(gmod);
else
dev_err(hd->parent, "module id %d not found\n", module_id);
}
void gb_remove_modules(struct greybus_host_device *hd)
{
struct gb_module *gmod, *temp;
list_for_each_entry_safe(gmod, temp, &hd->modules, links)
gb_module_destroy(gmod);
}
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