2 * firmware_sample_driver.c -
4 * Copyright (c) 2003 Manuel Estrada Sainz
6 * Sample code on how to use request_firmware() from drivers.
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/device.h>
14 #include <linux/string.h>
15 #include <linux/firmware.h>
17 static struct device ghost_device
= {
22 static void sample_firmware_load(char *firmware
, int size
)
25 memcpy(buf
, firmware
, size
);
27 printk(KERN_INFO
"firmware_sample_driver: firmware: %s\n", buf
);
30 static void sample_probe_default(void)
32 /* uses the default method to get the firmware */
33 const struct firmware
*fw_entry
;
36 printk(KERN_INFO
"firmware_sample_driver: "
37 "a ghost device got inserted :)\n");
39 retval
= request_firmware(&fw_entry
, "sample_driver_fw", &ghost_device
);
42 "firmware_sample_driver: Firmware not available\n");
46 sample_firmware_load(fw_entry
->data
, fw_entry
->size
);
48 release_firmware(fw_entry
);
50 /* finish setting up the device */
53 static void sample_probe_specific(void)
56 /* Uses some specific hotplug support to get the firmware from
57 * userspace directly into the hardware, or via some sysfs file */
59 /* NOTE: This currently doesn't work */
61 printk(KERN_INFO
"firmware_sample_driver: "
62 "a ghost device got inserted :)\n");
64 retval
= request_firmware(NULL
, "sample_driver_fw", &ghost_device
);
67 "firmware_sample_driver: Firmware load failed\n");
71 /* request_firmware blocks until userspace finished, so at
72 * this point the firmware should be already in the device */
74 /* finish setting up the device */
77 static void sample_probe_async_cont(const struct firmware
*fw
, void *context
)
81 "firmware_sample_driver: firmware load failed\n");
85 printk(KERN_INFO
"firmware_sample_driver: device pointer \"%s\"\n",
87 sample_firmware_load(fw
->data
, fw
->size
);
90 static void sample_probe_async(void)
92 /* Let's say that I can't sleep */
94 error
= request_firmware_nowait(THIS_MODULE
, FW_ACTION_NOHOTPLUG
,
95 "sample_driver_fw", &ghost_device
,
97 sample_probe_async_cont
);
99 printk(KERN_ERR
"firmware_sample_driver:"
100 " request_firmware_nowait failed\n");
103 static int sample_init(void)
105 device_initialize(&ghost_device
);
106 /* since there is no real hardware insertion I just call the
107 * sample probe functions here */
108 sample_probe_specific();
109 sample_probe_default();
110 sample_probe_async();
114 static void __exit
sample_exit(void)
118 module_init(sample_init
);
119 module_exit(sample_exit
);
121 MODULE_LICENSE("GPL");
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