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1da177e4 LT |
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> | |
4e57b681 TS |
17 | #include <linux/slab.h> |
18 | #include <linux/string.h> | |
1da177e4 LT |
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 = { | |
1da177e4 LT |
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 |