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/*
* Greybus module code
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include "greybus.h"
/* module sysfs attributes */
static ssize_t epm_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
// FIXME
// Implement something here when we have a working control protocol
return sprintf(buf, "1\n");
}
static ssize_t epm_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
// FIXME
// Implement something here when we have a working control protocol
return 0;
}
static DEVICE_ATTR_RW(epm);
static ssize_t power_control_show(struct device *dev,
struct device_attribute *addr, char *buf)
{
// FIXME
// Implement something here when we have a working control protocol
return sprintf(buf, "1\n");
}
static ssize_t power_control_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
// FIXME
// Implement something here when we have a working control protocol
return 0;
}
static DEVICE_ATTR_RW(power_control);
static ssize_t present_show(struct device *dev,
struct device_attribute *addr, char *buf)
{
// FIXME
// Implement something here when we have a working control protocol
return sprintf(buf, "1\n");
}
static ssize_t present_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
// FIXME
// Implement something here when we have a working control protocol
return 0;
}
static DEVICE_ATTR_RW(present);
static struct attribute *module_attrs[] = {
&dev_attr_epm.attr,
&dev_attr_power_control.attr,
&dev_attr_present.attr,
NULL,
};
ATTRIBUTE_GROUPS(module);
static void gb_module_release(struct device *dev)
{
struct gb_module *module = to_gb_module(dev);
kfree(module);
}
struct device_type greybus_module_type = {
.name = "greybus_module",
.release = gb_module_release,
};
struct module_find {
struct gb_endo *endo;
u8 module_id;
};
static int module_find(struct device *dev, void *data)
{
struct gb_module *module;
struct module_find *find = data;
if (!is_gb_module(dev))
return 0;
module = to_gb_module(dev);
if ((module->module_id == find->module_id) &&
(module->dev.parent == &find->endo->dev))
return 1;
return 0;
}
/*
* Search the list of modules in the system. If one is found, return it, with
* the reference count incremented.
*/
struct gb_module *gb_module_find(struct gb_host_device *hd, u8 module_id)
{
struct device *dev;
struct gb_module *module = NULL;
struct module_find find;
if (!module_id)
return NULL;
find.module_id = module_id;
find.endo = hd->endo;
dev = bus_find_device(&greybus_bus_type, NULL,
&find, module_find);
if (dev)
module = to_gb_module(dev);
return module;
}
struct gb_module *gb_module_create(struct device *parent, u8 module_id)
{
struct gb_module *module;
int retval;
module = kzalloc(sizeof(*module), GFP_KERNEL);
if (!module)
return NULL;
module->module_id = module_id;
module->dev.parent = parent;
module->dev.bus = &greybus_bus_type;
module->dev.type = &greybus_module_type;
module->dev.groups = module_groups;
module->dev.dma_mask = parent->dma_mask;
device_initialize(&module->dev);
dev_set_name(&module->dev, "%s:%hhu", dev_name(parent), module_id);
retval = device_add(&module->dev);
if (retval) {
pr_err("failed to add module device for id 0x%02hhx\n",
module_id);
put_device(&module->dev);
return NULL;
}
return module;
}
static int module_remove(struct device *dev, void *data)
{
struct gb_module *module;
struct gb_endo *endo = data;
if (!is_gb_module(dev))
return 0;
module = to_gb_module(dev);
if (module->dev.parent == &endo->dev)
device_unregister(&module->dev);
return 0;
}
void gb_module_remove_all(struct gb_endo *endo)
{
bus_for_each_dev(&greybus_bus_type, NULL, endo, module_remove);
}
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