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 .bus_id = "my_dev0",
176 };
177
178 static int __init firmware_sample_init(void)
179 {
180 int error;
181
182 device_initialize(&my_device);
183 class_dev = kmalloc(sizeof(struct class_device), GFP_KERNEL);
184 if(!class_dev)
185 return -ENOMEM;
186
187 error = fw_setup_class_device(class_dev, "my_firmware_image",
188 &my_device);
189 if(error){
190 kfree(class_dev);
191 return error;
192 }
193 return 0;
194
195 }
196 static void __exit firmware_sample_exit(void)
197 {
198 struct firmware_priv *fw_priv = class_get_devdata(class_dev);
199 fw_remove_class_device(class_dev);
200 kfree(fw_priv);
201 kfree(class_dev);
202 }
203 module_init(firmware_sample_init);
204 module_exit(firmware_sample_exit);
205
206
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