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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");