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1da177e4 LT |
1 | /* |
2 | * firmware_sample_firmware_class.c - | |
3 | * | |
87d37a4f | 4 | * Copyright (c) 2003 Manuel Estrada Sainz |
1da177e4 LT |
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 | ||
87d37a4f | 22 | MODULE_AUTHOR("Manuel Estrada Sainz"); |
1da177e4 LT |
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 | { | |
4b65fc8c | 28 | return container_of(obj, struct class_device, kobj); |
1da177e4 | 29 | } |
4b65fc8c | 30 | |
1da177e4 LT |
31 | static inline |
32 | struct class_device_attribute *to_class_dev_attr(struct attribute *_attr) | |
33 | { | |
4b65fc8c | 34 | return container_of(_attr, struct class_device_attribute, attr); |
1da177e4 LT |
35 | } |
36 | ||
1da177e4 LT |
37 | struct firmware_priv { |
38 | char fw_id[FIRMWARE_NAME_MAX]; | |
39 | s32 loading:2; | |
40 | u32 abort:1; | |
41 | }; | |
42 | ||
1da177e4 LT |
43 | static ssize_t firmware_loading_show(struct class_device *class_dev, char *buf) |
44 | { | |
45 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
46 | return sprintf(buf, "%d\n", fw_priv->loading); | |
47 | } | |
4b65fc8c | 48 | |
1da177e4 LT |
49 | static ssize_t firmware_loading_store(struct class_device *class_dev, |
50 | const char *buf, size_t count) | |
51 | { | |
52 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
53 | int prev_loading = fw_priv->loading; | |
54 | ||
55 | fw_priv->loading = simple_strtol(buf, NULL, 10); | |
d289bf7b | 56 | |
4b65fc8c | 57 | switch (fw_priv->loading) { |
1da177e4 LT |
58 | case -1: |
59 | /* abort load an panic */ | |
60 | break; | |
61 | case 1: | |
62 | /* setup load */ | |
63 | break; | |
64 | case 0: | |
4b65fc8c | 65 | if (prev_loading == 1) { |
1da177e4 LT |
66 | /* finish load and get the device back to working |
67 | * state */ | |
68 | } | |
69 | break; | |
70 | } | |
71 | ||
72 | return count; | |
73 | } | |
74 | static CLASS_DEVICE_ATTR(loading, 0644, | |
75 | firmware_loading_show, firmware_loading_store); | |
76 | ||
77 | static ssize_t firmware_data_read(struct kobject *kobj, | |
91a69029 | 78 | struct bin_attribute *bin_attr, |
1da177e4 LT |
79 | char *buffer, loff_t offset, size_t count) |
80 | { | |
81 | struct class_device *class_dev = to_class_dev(kobj); | |
82 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
83 | ||
84 | /* read from the devices firmware memory */ | |
85 | ||
86 | return count; | |
87 | } | |
88 | static ssize_t firmware_data_write(struct kobject *kobj, | |
91a69029 | 89 | struct bin_attribute *bin_attr, |
1da177e4 LT |
90 | char *buffer, loff_t offset, size_t count) |
91 | { | |
92 | struct class_device *class_dev = to_class_dev(kobj); | |
93 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
94 | ||
95 | /* write to the devices firmware memory */ | |
96 | ||
97 | return count; | |
98 | } | |
99 | static struct bin_attribute firmware_attr_data = { | |
100 | .attr = {.name = "data", .mode = 0644}, | |
101 | .size = 0, | |
102 | .read = firmware_data_read, | |
103 | .write = firmware_data_write, | |
104 | }; | |
105 | static int fw_setup_class_device(struct class_device *class_dev, | |
106 | const char *fw_name, | |
107 | struct device *device) | |
108 | { | |
f035ac82 MK |
109 | int retval; |
110 | struct firmware_priv *fw_priv; | |
1da177e4 | 111 | |
f035ac82 MK |
112 | fw_priv = kzalloc(sizeof(struct firmware_priv), GFP_KERNEL); |
113 | if (!fw_priv) { | |
1da177e4 LT |
114 | retval = -ENOMEM; |
115 | goto out; | |
116 | } | |
f035ac82 | 117 | |
1da177e4 LT |
118 | memset(class_dev, 0, sizeof(*class_dev)); |
119 | ||
120 | strncpy(fw_priv->fw_id, fw_name, FIRMWARE_NAME_MAX); | |
121 | fw_priv->fw_id[FIRMWARE_NAME_MAX-1] = '\0'; | |
122 | ||
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; | |
126 | ||
09857e35 | 127 | class_dev->class = &firmware_class; |
1da177e4 LT |
128 | class_set_devdata(class_dev, fw_priv); |
129 | retval = class_device_register(class_dev); | |
4b65fc8c | 130 | if (retval) { |
1da177e4 | 131 | printk(KERN_ERR "%s: class_device_register failed\n", |
4b65fc8c | 132 | __func__); |
1da177e4 LT |
133 | goto error_free_fw_priv; |
134 | } | |
135 | ||
136 | retval = sysfs_create_bin_file(&class_dev->kobj, &firmware_attr_data); | |
4b65fc8c | 137 | if (retval) { |
1da177e4 | 138 | printk(KERN_ERR "%s: sysfs_create_bin_file failed\n", |
4b65fc8c | 139 | __func__); |
1da177e4 LT |
140 | goto error_unreg_class_dev; |
141 | } | |
142 | ||
143 | retval = class_device_create_file(class_dev, | |
144 | &class_device_attr_loading); | |
4b65fc8c | 145 | if (retval) { |
1da177e4 | 146 | printk(KERN_ERR "%s: class_device_create_file failed\n", |
4b65fc8c | 147 | __func__); |
1da177e4 LT |
148 | goto error_remove_data; |
149 | } | |
150 | ||
151 | goto out; | |
d289bf7b | 152 | |
1da177e4 LT |
153 | 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); | |
157 | error_free_fw_priv: | |
158 | kfree(fw_priv); | |
159 | out: | |
160 | return retval; | |
161 | } | |
162 | static void fw_remove_class_device(struct class_device *class_dev) | |
163 | { | |
164 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
165 | ||
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); | |
169 | } | |
170 | ||
171 | static struct class_device *class_dev; | |
172 | ||
173 | static struct device my_device = { | |
1da177e4 LT |
174 | .bus_id = "my_dev0", |
175 | }; | |
176 | ||
177 | static int __init firmware_sample_init(void) | |
178 | { | |
179 | int error; | |
180 | ||
181 | device_initialize(&my_device); | |
182 | class_dev = kmalloc(sizeof(struct class_device), GFP_KERNEL); | |
4b65fc8c | 183 | if (!class_dev) |
1da177e4 LT |
184 | return -ENOMEM; |
185 | ||
186 | error = fw_setup_class_device(class_dev, "my_firmware_image", | |
187 | &my_device); | |
4b65fc8c | 188 | if (error) { |
1da177e4 LT |
189 | kfree(class_dev); |
190 | return error; | |
191 | } | |
4b65fc8c | 192 | return 0; |
1da177e4 LT |
193 | |
194 | } | |
195 | static void __exit firmware_sample_exit(void) | |
196 | { | |
197 | struct firmware_priv *fw_priv = class_get_devdata(class_dev); | |
198 | fw_remove_class_device(class_dev); | |
199 | kfree(fw_priv); | |
200 | kfree(class_dev); | |
201 | } | |
d289bf7b | 202 | |
1da177e4 LT |
203 | module_init(firmware_sample_init); |
204 | module_exit(firmware_sample_exit); |