2 * firmware_sample_firmware_class.c -
4 * Copyright (c) 2003 Manuel Estrada Sainz <ranty@debian.org>
6 * NOTE: This is just a probe of concept, if you think that your driver would
7 * be well served by this mechanism please contact me first.
9 * DON'T USE THIS CODE AS IS
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/timer.h>
17 #include <asm/hardirq.h>
19 #include "linux/firmware.h"
21 MODULE_AUTHOR("Manuel Estrada Sainz <ranty@debian.org>");
22 MODULE_DESCRIPTION("Hackish sample for using firmware class directly");
23 MODULE_LICENSE("GPL");
25 static inline struct class_device *to_class_dev(struct kobject *obj)
27 return container_of(obj,struct class_device,kobj);
30 struct class_device_attribute *to_class_dev_attr(struct attribute *_attr)
32 return container_of(_attr,struct class_device_attribute,attr);
35 int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr);
36 int sysfs_remove_bin_file(struct kobject * kobj, struct bin_attribute * attr);
38 struct firmware_priv {
39 char fw_id[FIRMWARE_NAME_MAX];
44 extern struct class firmware_class;
46 static ssize_t firmware_loading_show(struct class_device *class_dev, char *buf)
48 struct firmware_priv *fw_priv = class_get_devdata(class_dev);
49 return sprintf(buf, "%d\n", fw_priv->loading);
51 static ssize_t firmware_loading_store(struct class_device *class_dev,
52 const char *buf, size_t count)
54 struct firmware_priv *fw_priv = class_get_devdata(class_dev);
55 int prev_loading = fw_priv->loading;
57 fw_priv->loading = simple_strtol(buf, NULL, 10);
59 switch(fw_priv->loading){
61 /* abort load an panic */
68 /* finish load and get the device back to working
76 static CLASS_DEVICE_ATTR(loading, 0644,
77 firmware_loading_show, firmware_loading_store);
79 static ssize_t firmware_data_read(struct kobject *kobj,
80 char *buffer, loff_t offset, size_t count)
82 struct class_device *class_dev = to_class_dev(kobj);
83 struct firmware_priv *fw_priv = class_get_devdata(class_dev);
85 /* read from the devices firmware memory */
89 static ssize_t firmware_data_write(struct kobject *kobj,
90 char *buffer, loff_t offset, size_t count)
92 struct class_device *class_dev = to_class_dev(kobj);
93 struct firmware_priv *fw_priv = class_get_devdata(class_dev);
95 /* write to the devices firmware memory */
99 static struct bin_attribute firmware_attr_data = {
100 .attr = {.name = "data", .mode = 0644},
102 .read = firmware_data_read,
103 .write = firmware_data_write,
105 static int fw_setup_class_device(struct class_device *class_dev,
107 struct device *device)
110 struct firmware_priv *fw_priv = kmalloc(sizeof(struct firmware_priv),
117 memset(fw_priv, 0, sizeof(*fw_priv));
118 memset(class_dev, 0, sizeof(*class_dev));
120 strncpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX);
121 fw_priv->fw_id[FIRMWARE_NAME_MAX-1] = '\0';
123 strncpy(class_dev->class_id, device->bus_id, BUS_ID_SIZE);
124 class_dev->class_id[BUS_ID_SIZE-1] = '\0';
125 class_dev->dev = device;
127 class_dev->class = &firmware_class,
128 class_set_devdata(class_dev, fw_priv);
129 retval = class_device_register(class_dev);
131 printk(KERN_ERR "%s: class_device_register failed\n",
133 goto error_free_fw_priv;
136 retval = sysfs_create_bin_file(&class_dev->kobj, &firmware_attr_data);
138 printk(KERN_ERR "%s: sysfs_create_bin_file failed\n",
140 goto error_unreg_class_dev;
143 retval = class_device_create_file(class_dev,
144 &class_device_attr_loading);
146 printk(KERN_ERR "%s: class_device_create_file failed\n",
148 goto error_remove_data;
154 sysfs_remove_bin_file(&class_dev->kobj, &firmware_attr_data);
155 error_unreg_class_dev:
156 class_device_unregister(class_dev);
162 static void fw_remove_class_device(struct class_device *class_dev)
164 struct firmware_priv *fw_priv = class_get_devdata(class_dev);
166 class_device_remove_file(class_dev, &class_device_attr_loading);
167 sysfs_remove_bin_file(&class_dev->kobj, &firmware_attr_data);
168 class_device_unregister(class_dev);
171 static struct class_device *class_dev;
173 static struct device my_device = {
174 .name = "Sample Device",
178 static int __init firmware_sample_init(void)
182 device_initialize(&my_device);
183 class_dev = kmalloc(sizeof(struct class_device), GFP_KERNEL);
187 error = fw_setup_class_device(class_dev, "my_firmware_image",
196 static void __exit firmware_sample_exit(void)
198 struct firmware_priv *fw_priv = class_get_devdata(class_dev);
199 fw_remove_class_device(class_dev);
203 module_init(firmware_sample_init);
204 module_exit(firmware_sample_exit);