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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;
}
static void greybus_module_release(struct device *dev)
{
struct gb_module *gmod = to_gb_module(dev);
kfree(gmod);
}
static 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 = kzalloc(sizeof(*gmod), GFP_KERNEL);
if (!gmod)
return NULL;
gmod->hd = hd; /* XXX refcount? */
gmod->module_id = module_id; /* XXX check for dups */
INIT_LIST_HEAD(&gmod->interfaces);
spin_lock_irq(&gb_modules_lock);
list_add_tail(&gmod->links, &hd->modules);
spin_unlock_irq(&gb_modules_lock);
gmod->dev.parent = hd->parent;
gmod->dev.driver = NULL;
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) {
put_device(&gmod->dev);
return NULL;
}
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);
}
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;
}
int
gb_module_interface_init(struct gb_module *gmod, u8 interface_id, u8 device_id)
{
struct gb_interface *interface;
int ret;
interface = gb_interface_find(gmod, interface_id);
if (!interface) {
dev_err(gmod->hd->parent, "module %hhu not found\n",
interface_id);
return -ENOENT;
}
ret = svc_set_route_send(interface, gmod->hd);
if (ret) {
dev_err(gmod->hd->parent, "failed to set route (%d)\n", ret);
return ret;
}
ret = gb_interface_connections_init(interface);
if (ret) {
dev_err(gmod->hd->parent, "module interface init error %d\n",
ret);
/* XXX clear route */
return ret;
}
interface->device_id = device_id;
return 0;
}
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