122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/*
|
|
* firmware_sample_driver.c -
|
|
*
|
|
* Copyright (c) 2003 Manuel Estrada Sainz
|
|
*
|
|
* Sample code on how to use request_firmware() from drivers.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/device.h>
|
|
#include <linux/string.h>
|
|
#include <linux/firmware.h>
|
|
|
|
static struct device ghost_device = {
|
|
.bus_id = "ghost0",
|
|
};
|
|
|
|
|
|
static void sample_firmware_load(char *firmware, int size)
|
|
{
|
|
u8 buf[size+1];
|
|
memcpy(buf, firmware, size);
|
|
buf[size] = '\0';
|
|
printk(KERN_INFO "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;
|
|
int retval;
|
|
|
|
printk(KERN_INFO "firmware_sample_driver: "
|
|
"a ghost device got inserted :)\n");
|
|
|
|
retval = request_firmware(&fw_entry, "sample_driver_fw", &ghost_device);
|
|
if (retval) {
|
|
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)
|
|
{
|
|
int retval;
|
|
/* 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(KERN_INFO "firmware_sample_driver: "
|
|
"a ghost device got inserted :)\n");
|
|
|
|
retval = request_firmware(NULL, "sample_driver_fw", &ghost_device);
|
|
if (retval) {
|
|
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(KERN_INFO "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, FW_ACTION_NOHOTPLUG,
|
|
"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)
|
|
{
|
|
device_initialize(&ghost_device);
|
|
/* 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");
|