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