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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 scnprintf(buf, PAGE_SIZE, type"\n", intf->field); \
} \
static DEVICE_ATTR_RO(field)
gb_interface_attr(ddbl1_manufacturer_id, "0x%08x");
gb_interface_attr(ddbl1_product_id, "0x%08x");
gb_interface_attr(interface_id, "%u");
gb_interface_attr(vendor_string, "%s");
gb_interface_attr(product_string, "%s");
gb_interface_attr(serial_number, "0x%016llx");
static ssize_t vendor_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct gb_interface *intf = to_gb_interface(dev);
/* clear the upper 16-bits to keep userspace "simple" */
return scnprintf(buf, PAGE_SIZE, "0x%04x\n",
(0x0000FFFF & intf->vendor_id));
}
static DEVICE_ATTR_RO(vendor_id);
static ssize_t product_id_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct gb_interface *intf = to_gb_interface(dev);
/* clear the upper 16-bits to keep userspace "simple" */
return scnprintf(buf, PAGE_SIZE, "0x%04x\n",
(0x0000FFFF & intf->product_id));
}
static DEVICE_ATTR_RO(product_id);
static ssize_t version_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct gb_interface *intf = to_gb_interface(dev);
return scnprintf(buf, PAGE_SIZE, "%u.%u\n", intf->version_major,
intf->version_minor);
}
static DEVICE_ATTR_RO(version);
static struct attribute *interface_attrs[] = {
&dev_attr_ddbl1_manufacturer_id.attr,
&dev_attr_ddbl1_product_id.attr,
&dev_attr_interface_id.attr,
&dev_attr_vendor_id.attr,
&dev_attr_product_id.attr,
&dev_attr_vendor_string.attr,
&dev_attr_product_string.attr,
&dev_attr_serial_number.attr,
&dev_attr_version.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 gb_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 gb_interface_release(struct device *dev)
{
struct gb_interface *intf = to_gb_interface(dev);
kfree(intf->product_string);
kfree(intf->vendor_string);
if (intf->control)
gb_control_destroy(intf->control);
kfree(intf);
}
struct device_type greybus_interface_type = {
.name = "greybus_interface",
.release = gb_interface_release,
};
/*
* A Greybus module represents a user-replaceable 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.
*/
struct gb_interface *gb_interface_create(struct gb_host_device *hd,
u8 interface_id)
{
struct gb_interface *intf;
intf = kzalloc(sizeof(*intf), GFP_KERNEL);
if (!intf)
return NULL;
intf->hd = hd; /* XXX refcount? */
intf->interface_id = interface_id;
INIT_LIST_HEAD(&intf->bundles);
INIT_LIST_HEAD(&intf->manifest_descs);
/* Invalid device id to start with */
intf->device_id = GB_DEVICE_ID_BAD;
intf->dev.parent = &hd->dev;
intf->dev.bus = &greybus_bus_type;
intf->dev.type = &greybus_interface_type;
intf->dev.groups = interface_groups;
intf->dev.dma_mask = hd->dev.dma_mask;
device_initialize(&intf->dev);
dev_set_name(&intf->dev, "%d-%d", hd->bus_id, interface_id);
intf->control = gb_control_create(intf);
if (!intf->control) {
put_device(&intf->dev);
return NULL;
}
spin_lock_irq(&gb_interfaces_lock);
list_add(&intf->links, &hd->interfaces);
spin_unlock_irq(&gb_interfaces_lock);
return intf;
}
/*
* Tear down a previously set up interface.
*/
void gb_interface_remove(struct gb_interface *intf)
{
struct gb_bundle *bundle;
struct gb_bundle *next;
if (intf->disconnected)
gb_control_disable(intf->control);
list_for_each_entry_safe(bundle, next, &intf->bundles, links)
gb_bundle_destroy(bundle);
if (device_is_registered(&intf->dev))
device_del(&intf->dev);
gb_control_disable(intf->control);
spin_lock_irq(&gb_interfaces_lock);
list_del(&intf->links);
spin_unlock_irq(&gb_interfaces_lock);
put_device(&intf->dev);
}
void gb_interfaces_remove(struct gb_host_device *hd)
{
struct gb_interface *intf, *temp;
list_for_each_entry_safe(intf, temp, &hd->interfaces, links)
gb_interface_remove(intf);
}
/**
* gb_interface_init
*
* Create connection for control CPort and then request/parse manifest.
* Finally initialize all the bundles to set routes via SVC and initialize all
* connections.
*/
int gb_interface_init(struct gb_interface *intf, u8 device_id)
{
struct gb_bundle *bundle, *tmp;
int ret, size;
void *manifest;
intf->device_id = device_id;
/* Establish control connection */
ret = gb_control_enable(intf->control);
if (ret)
return ret;
/* Get manifest size using control protocol on CPort */
size = gb_control_get_manifest_size_operation(intf);
if (size <= 0) {
dev_err(&intf->dev, "failed to get manifest size: %d\n", size);
if (size)
return size;
else
return -EINVAL;
}
manifest = kmalloc(size, GFP_KERNEL);
if (!manifest)
return -ENOMEM;
/* Get manifest using control protocol on CPort */
ret = gb_control_get_manifest_operation(intf, manifest, size);
if (ret) {
dev_err(&intf->dev, "failed to get manifest: %d\n", ret);
goto free_manifest;
}
/*
* Parse the manifest and build up our data structures representing
* what's in it.
*/
if (!gb_manifest_parse(intf, manifest, size)) {
dev_err(&intf->dev, "failed to parse manifest\n");
ret = -EINVAL;
goto free_manifest;
}
ret = gb_control_get_interface_version_operation(intf);
if (ret)
goto free_manifest;
ret = gb_control_get_bundle_versions(intf->control);
if (ret)
goto free_manifest;
/* Register the interface and its bundles. */
ret = device_add(&intf->dev);
if (ret) {
dev_err(&intf->dev, "failed to register interface: %d\n", ret);
goto free_manifest;
}
list_for_each_entry_safe_reverse(bundle, tmp, &intf->bundles, links) {
ret = gb_bundle_add(bundle);
if (ret) {
gb_bundle_destroy(bundle);
continue;
}
}
ret = 0;
free_manifest:
kfree(manifest);
return ret;
}
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