NFSv4: Fix an Oops in nfs_do_expire_all_delegations
[linux-2.6] / Documentation / firmware_class / firmware_sample_firmware_class.c
1 /*
2  * firmware_sample_firmware_class.c -
3  *
4  * Copyright (c) 2003 Manuel Estrada Sainz <ranty@debian.org>
5  *
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.
8  *
9  * DON'T USE THIS CODE AS IS
10  *
11  */
12
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/timer.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/firmware.h>
20
21
22 MODULE_AUTHOR("Manuel Estrada Sainz <ranty@debian.org>");
23 MODULE_DESCRIPTION("Hackish sample for using firmware class directly");
24 MODULE_LICENSE("GPL");
25
26 static inline struct class_device *to_class_dev(struct kobject *obj)
27 {
28         return container_of(obj,struct class_device,kobj);
29 }
30 static inline
31 struct class_device_attribute *to_class_dev_attr(struct attribute *_attr)
32 {
33         return container_of(_attr,struct class_device_attribute,attr);
34 }
35
36 int sysfs_create_bin_file(struct kobject * kobj, struct bin_attribute * attr);
37 int sysfs_remove_bin_file(struct kobject * kobj, struct bin_attribute * attr);
38
39 struct firmware_priv {
40         char fw_id[FIRMWARE_NAME_MAX];
41         s32 loading:2;
42         u32 abort:1;
43 };
44
45 extern struct class firmware_class;
46
47 static ssize_t firmware_loading_show(struct class_device *class_dev, char *buf)
48 {
49         struct firmware_priv *fw_priv = class_get_devdata(class_dev);
50         return sprintf(buf, "%d\n", fw_priv->loading);
51 }
52 static ssize_t firmware_loading_store(struct class_device *class_dev,
53                                       const char *buf, size_t count)
54 {
55         struct firmware_priv *fw_priv = class_get_devdata(class_dev);
56         int prev_loading = fw_priv->loading;
57
58         fw_priv->loading = simple_strtol(buf, NULL, 10);
59         
60         switch(fw_priv->loading){
61         case -1:
62                 /* abort load an panic */
63                 break;
64         case 1:
65                 /* setup load */
66                 break;
67         case 0:
68                 if(prev_loading==1){
69                         /* finish load and get the device back to working
70                          * state */
71                 }
72                 break;
73         }
74
75         return count;
76 }
77 static CLASS_DEVICE_ATTR(loading, 0644,
78                          firmware_loading_show, firmware_loading_store);
79
80 static ssize_t firmware_data_read(struct kobject *kobj,
81                                   char *buffer, loff_t offset, size_t count)
82 {
83         struct class_device *class_dev = to_class_dev(kobj);
84         struct firmware_priv *fw_priv = class_get_devdata(class_dev);
85
86         /* read from the devices firmware memory */
87
88         return count;
89 }
90 static ssize_t firmware_data_write(struct kobject *kobj,
91                                    char *buffer, loff_t offset, size_t count)
92 {
93         struct class_device *class_dev = to_class_dev(kobj);
94         struct firmware_priv *fw_priv = class_get_devdata(class_dev);
95
96         /* write to the devices firmware memory */
97
98         return count;
99 }
100 static struct bin_attribute firmware_attr_data = {
101         .attr = {.name = "data", .mode = 0644},
102         .size = 0,
103         .read = firmware_data_read,
104         .write = firmware_data_write,
105 };
106 static int fw_setup_class_device(struct class_device *class_dev,
107                                  const char *fw_name,
108                                  struct device *device)
109 {
110         int retval = 0;
111         struct firmware_priv *fw_priv = kmalloc(sizeof(struct firmware_priv),
112                                                 GFP_KERNEL);
113
114         if(!fw_priv){
115                 retval = -ENOMEM;
116                 goto out;
117         }
118         memset(fw_priv, 0, sizeof(*fw_priv));
119         memset(class_dev, 0, sizeof(*class_dev));
120
121         strncpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX);
122         fw_priv->fw_id[FIRMWARE_NAME_MAX-1] = '\0';
123
124         strncpy(class_dev->class_id, device->bus_id, BUS_ID_SIZE);
125         class_dev->class_id[BUS_ID_SIZE-1] = '\0';
126         class_dev->dev = device;
127
128         class_dev->class = &firmware_class,
129         class_set_devdata(class_dev, fw_priv);
130         retval = class_device_register(class_dev);
131         if (retval){
132                 printk(KERN_ERR "%s: class_device_register failed\n",
133                        __FUNCTION__);
134                 goto error_free_fw_priv;
135         }
136
137         retval = sysfs_create_bin_file(&class_dev->kobj, &firmware_attr_data);
138         if (retval){
139                 printk(KERN_ERR "%s: sysfs_create_bin_file failed\n",
140                        __FUNCTION__);
141                 goto error_unreg_class_dev;
142         }
143
144         retval = class_device_create_file(class_dev,
145                                           &class_device_attr_loading);
146         if (retval){
147                 printk(KERN_ERR "%s: class_device_create_file failed\n",
148                        __FUNCTION__);
149                 goto error_remove_data;
150         }
151
152         goto out;
153         
154 error_remove_data:
155         sysfs_remove_bin_file(&class_dev->kobj, &firmware_attr_data);
156 error_unreg_class_dev:
157         class_device_unregister(class_dev);
158 error_free_fw_priv:
159         kfree(fw_priv);
160 out:
161         return retval;
162 }
163 static void fw_remove_class_device(struct class_device *class_dev)
164 {
165         struct firmware_priv *fw_priv = class_get_devdata(class_dev);
166
167         class_device_remove_file(class_dev, &class_device_attr_loading);
168         sysfs_remove_bin_file(&class_dev->kobj, &firmware_attr_data);
169         class_device_unregister(class_dev);
170 }
171
172 static struct class_device *class_dev;
173
174 static struct device my_device = {
175         .name      = "Sample Device",
176         .bus_id    = "my_dev0",
177 };
178
179 static int __init firmware_sample_init(void)
180 {
181         int error;
182
183         device_initialize(&my_device);
184         class_dev = kmalloc(sizeof(struct class_device), GFP_KERNEL);
185         if(!class_dev)
186                 return -ENOMEM;
187
188         error = fw_setup_class_device(class_dev, "my_firmware_image",
189                                       &my_device);
190         if(error){
191                 kfree(class_dev);
192                 return error;
193         }
194         return 0;
195
196 }
197 static void __exit firmware_sample_exit(void)
198 {
199         struct firmware_priv *fw_priv = class_get_devdata(class_dev);
200         fw_remove_class_device(class_dev);
201         kfree(fw_priv);
202         kfree(class_dev);
203 }
204 module_init(firmware_sample_init);
205 module_exit(firmware_sample_exit);
206