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/*
 * firmware_sample_driver.c -
 *
 * Copyright (c) 2003 Manuel Estrada Sainz <ranty@debian.org>
 *
 * Sample code on how to use request_firmware() from drivers.
 *
 * Note that register_firmware() is currently useless.
 *
 */
 
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
 
#include "linux/firmware.h"
 
#define WE_CAN_NEED_FIRMWARE_BEFORE_USERSPACE_IS_AVAILABLE
#ifdef WE_CAN_NEED_FIRMWARE_BEFORE_USERSPACE_IS_AVAILABLE
char __init inkernel_firmware[] = "let's say that this is firmware\n";
#endif
 
static char ghost_device[] = "ghost0";
 
static void sample_firmware_load(char *firmware, int size)
{
	u8 buf[size+1];
	memcpy(buf, firmware, size);
	buf[size] = '\0';
	printk("firmware_sample_driver: firmware: %s\n", buf);
}
 
static void sample_probe_default(void)
{
	/* uses the default method to get the firmware */
        const struct firmware *fw_entry;
	printk("firmware_sample_driver: a ghost device got inserted :)\n");
 
        if(request_firmware(&fw_entry, "sample_driver_fw", ghost_device)!=0)
	{
		printk(KERN_ERR
		       "firmware_sample_driver: Firmware not available\n");
		return;
	}
 
	sample_firmware_load(fw_entry->data, fw_entry->size);
 
	release_firmware(fw_entry);
 
	/* finish setting up the device */
}
static void sample_probe_specific(void)
{
	/* Uses some specific hotplug support to get the firmware from
	 * userspace  directly into the hardware, or via some sysfs file */
 
	/* NOTE: This currently doesn't work */
 
	printk("firmware_sample_driver: a ghost device got inserted :)\n");
 
        if(request_firmware(NULL, "sample_driver_fw", ghost_device)!=0)
	{
		printk(KERN_ERR
		       "firmware_sample_driver: Firmware load failed\n");
		return;
	}
 
	/* request_firmware blocks until userspace finished, so at
	 * this point the firmware should be already in the device */
 
	/* finish setting up the device */
}
static void sample_probe_async_cont(const struct firmware *fw, void *context)
{
	if(!fw){
		printk(KERN_ERR
		       "firmware_sample_driver: firmware load failed\n");
		return;
	}
 
	printk("firmware_sample_driver: device pointer \"%s\"\n",
	       (char *)context);
	sample_firmware_load(fw->data, fw->size);
}
static void sample_probe_async(void)
{
	/* Let's say that I can't sleep */
	int error;
	error = request_firmware_nowait (THIS_MODULE,
					 "sample_driver_fw", ghost_device,
					 "my device pointer",
					 sample_probe_async_cont);
	if(error){
		printk(KERN_ERR 
		       "firmware_sample_driver:"
		       " request_firmware_nowait failed\n");
	}
}
 
static int sample_init(void)
{
#ifdef WE_CAN_NEED_FIRMWARE_BEFORE_USERSPACE_IS_AVAILABLE
	register_firmware("sample_driver_fw", inkernel_firmware,
			  sizeof(inkernel_firmware));
#endif
	/* since there is no real hardware insertion I just call the
	 * sample probe functions here */
	sample_probe_specific();
	sample_probe_default();
	sample_probe_async();
	return 0;
}
static void __exit sample_exit(void)
{
}
 
module_init (sample_init);
module_exit (sample_exit);
 
MODULE_LICENSE("GPL");