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/* linux/drivers/video/samsung/s5p_fimd_ext.c
*
* Samsung SoC FIMD Extension Device Framework.
*
* Inki Dae <inki.dae@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <plat/fimd_lite_ext.h>
#include "s5p_fimd_ext.h"
struct s5p_fimd_ext {
struct list_head list;
struct device *dev;
};
static LIST_HEAD(fimd_ext_list);
static DEFINE_MUTEX(fimd_ext_lock);
struct s5p_fimd_ext_device *to_fimd_ext_device(struct device *dev)
{
return dev ? container_of(dev, struct s5p_fimd_ext_device, dev) : NULL;
}
EXPORT_SYMBOL(to_fimd_ext_device);
struct s5p_fimd_ext_driver *to_fimd_ext_driver(struct device_driver *drv)
{
return drv ? container_of(drv, struct s5p_fimd_ext_driver, driver) :
NULL;
}
EXPORT_SYMBOL(to_fimd_ext_driver);
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
char *buf)
{
struct s5p_fimd_ext_device *fx_dev = to_fimd_ext_device(dev);
int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", fx_dev->name);
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
}
static struct device_attribute s5p_fimd_ext_dev_attrs[] = {
__ATTR_RO(modalias),
__ATTR_NULL,
};
static int s5p_fimd_ext_match_device(struct device *dev,
struct device_driver *drv)
{
const struct s5p_fimd_ext_device *fx_dev = to_fimd_ext_device(dev);
const struct s5p_fimd_ext_driver *fx_drv = to_fimd_ext_driver(drv);
return strcmp(fx_dev->name, fx_drv->driver.name) == 0;
}
struct bus_type s5p_fimd_ext_bus_type = {
.name = "fimd_ext",
.dev_attrs = s5p_fimd_ext_dev_attrs,
.match = s5p_fimd_ext_match_device,
};
static int s5p_fimd_ext_drv_probe(struct device *dev)
{
const struct s5p_fimd_ext_driver *fx_drv =
to_fimd_ext_driver(dev->driver);
return fx_drv->probe(to_fimd_ext_device(dev));
}
struct resource *s5p_fimd_ext_get_resource(struct s5p_fimd_ext_device *fx_dev,
unsigned int type, unsigned int num)
{
int i;
for (i = 0; i < fx_dev->num_resources; i++) {
struct resource *r = &fx_dev->resource[i];
if (type == resource_type(r) && num-- == 0)
return r;
}
return NULL;
}
int s5p_fimd_ext_get_irq(struct s5p_fimd_ext_device *fx_dev, unsigned int num)
{
struct resource *r = s5p_fimd_ext_get_resource(fx_dev,
IORESOURCE_IRQ, num);
return r ? r->start : -ENXIO;
}
int s5p_fimd_ext_device_register(struct s5p_fimd_ext_device *fx_dev)
{
struct s5p_fimd_ext *fimd_ext;
int i, ret = 0;
fimd_ext = kzalloc(sizeof(struct s5p_fimd_ext), GFP_KERNEL);
if (!fimd_ext) {
printk(KERN_ERR "failed to allocate fimd_ext object.\n");
return -EFAULT;
}
fimd_ext->dev = &fx_dev->dev;
device_initialize(&fx_dev->dev);
if (!fx_dev->dev.parent)
fx_dev->dev.parent = &platform_bus;
fx_dev->dev.bus = &s5p_fimd_ext_bus_type;
if (fx_dev->id != -1)
dev_set_name(&fx_dev->dev, "%s.%d", fx_dev->name, fx_dev->id);
else
dev_set_name(&fx_dev->dev, "%s", fx_dev->name);
for (i = 0; i < fx_dev->num_resources; i++) {
struct resource *r = &fx_dev->resource[i];
if (r->name == NULL)
r->name = dev_name(&fx_dev->dev);
}
ret = device_add(&fx_dev->dev);
if (ret == 0) {
mutex_lock(&fimd_ext_lock);
list_add_tail(&fimd_ext->list, &fimd_ext_list);
mutex_unlock(&fimd_ext_lock);
return ret;
}
kfree(fimd_ext);
return ret;
}
EXPORT_SYMBOL(s5p_fimd_ext_device_register);
int s5p_fimd_ext_driver_register(struct s5p_fimd_ext_driver *fx_drv)
{
fx_drv->driver.bus = &s5p_fimd_ext_bus_type;
if (fx_drv->probe)
fx_drv->driver.probe = s5p_fimd_ext_drv_probe;
/* add some callbacks here. */
printk(KERN_DEBUG "registered a driver(%s) to fimd_ext driver.\n",
fx_drv->driver.name);
return driver_register(&fx_drv->driver);
}
EXPORT_SYMBOL(s5p_fimd_ext_driver_register);
struct s5p_fimd_ext_device *s5p_fimd_ext_find_device(const char *name)
{
struct s5p_fimd_ext *fimd_ext;
struct s5p_fimd_ext_device *fx_dev;
struct device *dev;
mutex_lock(&fimd_ext_lock);
printk(KERN_DEBUG "find ext driver (%s).\n", name);
list_for_each_entry(fimd_ext, &fimd_ext_list, list) {
dev = fimd_ext->dev;
fx_dev = to_fimd_ext_device(dev);
if ((strcmp(fx_dev->name, name)) == 0) {
mutex_unlock(&fimd_ext_lock);
printk(KERN_DEBUG "found!!!(%s).\n", fx_dev->name);
return fx_dev;
}
}
printk(KERN_WARNING "failed to find ext device(%s).\n", name);
mutex_unlock(&fimd_ext_lock);
return NULL;
}
static int __init s5p_fimd_ext_init(void)
{
return bus_register(&s5p_fimd_ext_bus_type);
}
static void __exit s5p_fimd_ext_exit(void)
{
}
early_initcall(s5p_fimd_ext_init);
module_exit(s5p_fimd_ext_exit);
MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC FIMD Extension Framework");
MODULE_LICENSE("GPL");
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