firmware: move firmware_class from Documentation/ to samples/

[linux-2.6-omap-h63xx.git] / samples / firmware_class / firmware_sample_driver.c

diff --git a/samples/firmware_class/firmware_sample_driver.c b/samples/firmware_class/firmware_sample_driver.c
new file mode 100644 (file)
index 0000000..ff0f2f2
--- /dev/null
+++ b/samples/firmware_class/firmware_sample_driver.c
@@ -0,0 +1,115 @@
+/*
+ * 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;
+       printk(KERN_INFO "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(KERN_INFO "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(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");