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/*
* Greybus bundles
*
* Copyright 2014-2015 Google Inc.
* Copyright 2014-2015 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include "greybus.h"
static ssize_t bundle_class_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_bundle *bundle = to_gb_bundle(dev);
return sprintf(buf, "0x%02x\n", bundle->class);
}
static DEVICE_ATTR_RO(bundle_class);
static ssize_t bundle_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_bundle *bundle = to_gb_bundle(dev);
return sprintf(buf, "%u\n", bundle->id);
}
static DEVICE_ATTR_RO(bundle_id);
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct gb_bundle *bundle = to_gb_bundle(dev);
if (bundle->state == NULL)
return sprintf(buf, "\n");
return sprintf(buf, "%s\n", bundle->state);
}
static ssize_t state_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
struct gb_bundle *bundle = to_gb_bundle(dev);
kfree(bundle->state);
bundle->state = kstrdup(buf, GFP_KERNEL);
if (!bundle->state)
return -ENOMEM;
/* Tell userspace that the file contents changed */
sysfs_notify(&bundle->dev.kobj, NULL, "state");
return size;
}
static DEVICE_ATTR_RW(state);
static struct attribute *bundle_attrs[] = {
&dev_attr_bundle_class.attr,
&dev_attr_bundle_id.attr,
&dev_attr_state.attr,
NULL,
};
ATTRIBUTE_GROUPS(bundle);
static struct gb_bundle *gb_bundle_find(struct gb_interface *intf,
u8 bundle_id)
{
struct gb_bundle *bundle;
list_for_each_entry(bundle, &intf->bundles, links) {
if (bundle->id == bundle_id)
return bundle;
}
return NULL;
}
static void gb_bundle_release(struct device *dev)
{
struct gb_bundle *bundle = to_gb_bundle(dev);
kfree(bundle->state);
kfree(bundle->cport_desc);
kfree(bundle);
}
struct device_type greybus_bundle_type = {
.name = "greybus_bundle",
.release = gb_bundle_release,
};
/*
* Create a gb_bundle structure to represent a discovered
* bundle. Returns a pointer to the new bundle or a null
* pointer if a failure occurs due to memory exhaustion.
*/
struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id,
u8 class)
{
struct gb_bundle *bundle;
/*
* Reject any attempt to reuse a bundle id. We initialize
* these serially, so there's no need to worry about keeping
* the interface bundle list locked here.
*/
if (gb_bundle_find(intf, bundle_id)) {
dev_err(&intf->dev, "duplicate bundle id %u\n", bundle_id);
return NULL;
}
bundle = kzalloc(sizeof(*bundle), GFP_KERNEL);
if (!bundle)
return NULL;
bundle->intf = intf;
bundle->id = bundle_id;
bundle->class = class;
INIT_LIST_HEAD(&bundle->connections);
bundle->dev.parent = &intf->dev;
bundle->dev.bus = &greybus_bus_type;
bundle->dev.type = &greybus_bundle_type;
bundle->dev.groups = bundle_groups;
bundle->dev.dma_mask = intf->dev.dma_mask;
device_initialize(&bundle->dev);
dev_set_name(&bundle->dev, "%s.%d", dev_name(&intf->dev), bundle_id);
list_add(&bundle->links, &intf->bundles);
return bundle;
}
int gb_bundle_add(struct gb_bundle *bundle)
{
int ret;
ret = device_add(&bundle->dev);
if (ret) {
dev_err(&bundle->dev, "failed to register bundle: %d\n", ret);
return ret;
}
return 0;
}
/*
* Tear down a previously set up bundle.
*/
void gb_bundle_destroy(struct gb_bundle *bundle)
{
if (device_is_registered(&bundle->dev))
device_del(&bundle->dev);
list_del(&bundle->links);
put_device(&bundle->dev);
}
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