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-rw-r--r--samples/firmware_class/firmware_sample_driver.c115
-rw-r--r--samples/firmware_class/firmware_sample_firmware_class.c207
2 files changed, 322 insertions, 0 deletions
diff --git a/samples/firmware_class/firmware_sample_driver.c b/samples/firmware_class/firmware_sample_driver.c
new file mode 100644
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");
diff --git a/samples/firmware_class/firmware_sample_firmware_class.c b/samples/firmware_class/firmware_sample_firmware_class.c
new file mode 100644
index 0000000..2799c47
--- /dev/null
+++ b/samples/firmware_class/firmware_sample_firmware_class.c
@@ -0,0 +1,207 @@
+/*
+ * firmware_sample_firmware_class.c -
+ *
+ * Copyright (c) 2003 Manuel Estrada Sainz
+ *
+ * NOTE: This is just a probe of concept, if you think that your driver would
+ * be well served by this mechanism please contact me first.
+ *
+ * DON'T USE THIS CODE AS IS
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/firmware.h>
+
+
+MODULE_AUTHOR("Manuel Estrada Sainz");
+MODULE_DESCRIPTION("Hackish sample for using firmware class directly");
+MODULE_LICENSE("GPL");
+
+static inline struct class_device *to_class_dev(struct kobject *obj)
+{
+ return container_of(obj,struct class_device,kobj);
+}
+static inline
+struct class_device_attribute *to_class_dev_attr(struct attribute *_attr)
+{
+ return container_of(_attr,struct class_device_attribute,attr);
+}
+
+int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr);
+int sysfs_remove_bin_file(struct kobject * kobj, struct bin_attribute * attr);
+
+struct firmware_priv {
+ char fw_id[FIRMWARE_NAME_MAX];
+ s32 loading:2;
+ u32 abort:1;
+};
+
+extern struct class firmware_class;
+
+static ssize_t firmware_loading_show(struct class_device *class_dev, char *buf)
+{
+ struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+ return sprintf(buf, "%d\n", fw_priv->loading);
+}
+static ssize_t firmware_loading_store(struct class_device *class_dev,
+ const char *buf, size_t count)
+{
+ struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+ int prev_loading = fw_priv->loading;
+
+ fw_priv->loading = simple_strtol(buf, NULL, 10);
+
+ switch(fw_priv->loading){
+ case -1:
+ /* abort load an panic */
+ break;
+ case 1:
+ /* setup load */
+ break;
+ case 0:
+ if(prev_loading==1){
+ /* finish load and get the device back to working
+ * state */
+ }
+ break;
+ }
+
+ return count;
+}
+static CLASS_DEVICE_ATTR(loading, 0644,
+ firmware_loading_show, firmware_loading_store);
+
+static ssize_t firmware_data_read(struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buffer, loff_t offset, size_t count)
+{
+ struct class_device *class_dev = to_class_dev(kobj);
+ struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+
+ /* read from the devices firmware memory */
+
+ return count;
+}
+static ssize_t firmware_data_write(struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buffer, loff_t offset, size_t count)
+{
+ struct class_device *class_dev = to_class_dev(kobj);
+ struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+
+ /* write to the devices firmware memory */
+
+ return count;
+}
+static struct bin_attribute firmware_attr_data = {
+ .attr = {.name = "data", .mode = 0644},
+ .size = 0,
+ .read = firmware_data_read,
+ .write = firmware_data_write,
+};
+static int fw_setup_class_device(struct class_device *class_dev,
+ const char *fw_name,
+ struct device *device)
+{
+ int retval;
+ struct firmware_priv *fw_priv;
+
+ fw_priv = kzalloc(sizeof(struct firmware_priv), GFP_KERNEL);
+ if (!fw_priv) {
+ retval = -ENOMEM;
+ goto out;
+ }
+
+ memset(class_dev, 0, sizeof(*class_dev));
+
+ strncpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX);
+ fw_priv->fw_id[FIRMWARE_NAME_MAX-1] = '\0';
+
+ strncpy(class_dev->class_id, device->bus_id, BUS_ID_SIZE);
+ class_dev->class_id[BUS_ID_SIZE-1] = '\0';
+ class_dev->dev = device;
+
+ class_dev->class = &firmware_class,
+ class_set_devdata(class_dev, fw_priv);
+ retval = class_device_register(class_dev);
+ if (retval){
+ printk(KERN_ERR "%s: class_device_register failed\n",
+ __FUNCTION__);
+ goto error_free_fw_priv;
+ }
+
+ retval = sysfs_create_bin_file(&class_dev->kobj, &firmware_attr_data);
+ if (retval){
+ printk(KERN_ERR "%s: sysfs_create_bin_file failed\n",
+ __FUNCTION__);
+ goto error_unreg_class_dev;
+ }
+
+ retval = class_device_create_file(class_dev,
+ &class_device_attr_loading);
+ if (retval){
+ printk(KERN_ERR "%s: class_device_create_file failed\n",
+ __FUNCTION__);
+ goto error_remove_data;
+ }
+
+ goto out;
+
+error_remove_data:
+ sysfs_remove_bin_file(&class_dev->kobj, &firmware_attr_data);
+error_unreg_class_dev:
+ class_device_unregister(class_dev);
+error_free_fw_priv:
+ kfree(fw_priv);
+out:
+ return retval;
+}
+static void fw_remove_class_device(struct class_device *class_dev)
+{
+ struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+
+ class_device_remove_file(class_dev, &class_device_attr_loading);
+ sysfs_remove_bin_file(&class_dev->kobj, &firmware_attr_data);
+ class_device_unregister(class_dev);
+}
+
+static struct class_device *class_dev;
+
+static struct device my_device = {
+ .bus_id = "my_dev0",
+};
+
+static int __init firmware_sample_init(void)
+{
+ int error;
+
+ device_initialize(&my_device);
+ class_dev = kmalloc(sizeof(struct class_device), GFP_KERNEL);
+ if(!class_dev)
+ return -ENOMEM;
+
+ error = fw_setup_class_device(class_dev, "my_firmware_image",
+ &my_device);
+ if(error){
+ kfree(class_dev);
+ return error;
+ }
+ return 0;
+
+}
+static void __exit firmware_sample_exit(void)
+{
+ struct firmware_priv *fw_priv = class_get_devdata(class_dev);
+ fw_remove_class_device(class_dev);
+ kfree(fw_priv);
+ kfree(class_dev);
+}
+
+module_init(firmware_sample_init);
+module_exit(firmware_sample_exit);
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