1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/module.h>
18#include <linux/string.h>
19#include <linux/usb.h>
20
21
22#define DRIVER_AUTHOR "Harrison Metzger <harrisonmetz@gmail.com>"
23#define DRIVER_DESC "USB 7 Segment Driver"
24
25#define VENDOR_ID 0x0fc5
26#define PRODUCT_ID 0x1227
27#define MAXLEN 6
28
29
30static struct usb_device_id id_table[] = {
31 { USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
32 { },
33};
34MODULE_DEVICE_TABLE(usb, id_table);
35
36
37static char *display_textmodes[] = {"raw", "hex", "ascii", NULL};
38
39struct usb_sevsegdev {
40 struct usb_device *udev;
41
42 u8 powered;
43 u8 mode_msb;
44 u8 mode_lsb;
45 u8 decimals[MAXLEN];
46 u8 textmode;
47 u8 text[MAXLEN];
48 u16 textlength;
49};
50
51
52
53
54
55
56inline size_t my_memlen(const char *buf, size_t count)
57{
58 if (count > 0 && buf[count-1] == '\n')
59 return count - 1;
60 else
61 return count;
62}
63
64static void update_display_powered(struct usb_sevsegdev *mydev)
65{
66 int rc;
67
68 rc = usb_control_msg(mydev->udev,
69 usb_sndctrlpipe(mydev->udev, 0),
70 0x12,
71 0x48,
72 (80 * 0x100) + 10,
73 (0x00 * 0x100) + (mydev->powered ? 1 : 0),
74 NULL,
75 0,
76 2000);
77 if (rc < 0)
78 dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
79}
80
81static void update_display_mode(struct usb_sevsegdev *mydev)
82{
83 int rc;
84
85 rc = usb_control_msg(mydev->udev,
86 usb_sndctrlpipe(mydev->udev, 0),
87 0x12,
88 0x48,
89 (82 * 0x100) + 10,
90 (mydev->mode_msb * 0x100) + mydev->mode_lsb,
91 NULL,
92 0,
93 2000);
94
95 if (rc < 0)
96 dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
97}
98
99static void update_display_visual(struct usb_sevsegdev *mydev)
100{
101 int rc;
102 int i;
103 unsigned char *buffer;
104 u8 decimals = 0;
105
106 buffer = kzalloc(MAXLEN, GFP_KERNEL);
107 if (!buffer) {
108 dev_err(&mydev->udev->dev, "out of memory\n");
109 return;
110 }
111
112
113 for (i = 0; i < mydev->textlength; i++)
114 buffer[i] = mydev->text[mydev->textlength-1-i];
115
116 rc = usb_control_msg(mydev->udev,
117 usb_sndctrlpipe(mydev->udev, 0),
118 0x12,
119 0x48,
120 (85 * 0x100) + 10,
121 (0 * 0x100) + mydev->textmode,
122 buffer,
123 mydev->textlength,
124 2000);
125
126 if (rc < 0)
127 dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
128
129 kfree(buffer);
130
131
132 for (i = 0; i < sizeof(mydev->decimals); i++)
133 decimals |= mydev->decimals[i] << i;
134
135 rc = usb_control_msg(mydev->udev,
136 usb_sndctrlpipe(mydev->udev, 0),
137 0x12,
138 0x48,
139 (86 * 0x100) + 10,
140 (0 * 0x100) + decimals,
141 NULL,
142 0,
143 2000);
144
145 if (rc < 0)
146 dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
147}
148
149#define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn) \
150static ssize_t show_attr_##name(struct device *dev, \
151 struct device_attribute *attr, char *buf) \
152{ \
153 struct usb_interface *intf = to_usb_interface(dev); \
154 struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
155 \
156 return sprintf(buf, "%u\n", mydev->name); \
157} \
158 \
159static ssize_t set_attr_##name(struct device *dev, \
160 struct device_attribute *attr, const char *buf, size_t count) \
161{ \
162 struct usb_interface *intf = to_usb_interface(dev); \
163 struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
164 \
165 mydev->name = simple_strtoul(buf, NULL, 10); \
166 update_fcn(mydev); \
167 \
168 return count; \
169} \
170static DEVICE_ATTR(name, S_IWUGO | S_IRUGO, show_attr_##name, set_attr_##name);
171
172static ssize_t show_attr_text(struct device *dev,
173 struct device_attribute *attr, char *buf)
174{
175 struct usb_interface *intf = to_usb_interface(dev);
176 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
177
178 return snprintf(buf, mydev->textlength, "%s\n", mydev->text);
179}
180
181static ssize_t set_attr_text(struct device *dev,
182 struct device_attribute *attr, const char *buf, size_t count)
183{
184 struct usb_interface *intf = to_usb_interface(dev);
185 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
186 size_t end = my_memlen(buf, count);
187
188 if (end > sizeof(mydev->text))
189 return -EINVAL;
190
191 memset(mydev->text, 0, sizeof(mydev->text));
192 mydev->textlength = end;
193
194 if (end > 0)
195 memcpy(mydev->text, buf, end);
196
197 update_display_visual(mydev);
198 return count;
199}
200
201static DEVICE_ATTR(text, S_IWUGO | S_IRUGO, show_attr_text, set_attr_text);
202
203static ssize_t show_attr_decimals(struct device *dev,
204 struct device_attribute *attr, char *buf)
205{
206 struct usb_interface *intf = to_usb_interface(dev);
207 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
208 int i;
209 int pos;
210
211 for (i = 0; i < sizeof(mydev->decimals); i++) {
212 pos = sizeof(mydev->decimals) - 1 - i;
213 if (mydev->decimals[i] == 0)
214 buf[pos] = '0';
215 else if (mydev->decimals[i] == 1)
216 buf[pos] = '1';
217 else
218 buf[pos] = 'x';
219 }
220
221 buf[sizeof(mydev->decimals)] = '\n';
222 return sizeof(mydev->decimals) + 1;
223}
224
225static ssize_t set_attr_decimals(struct device *dev,
226 struct device_attribute *attr, const char *buf, size_t count)
227{
228 struct usb_interface *intf = to_usb_interface(dev);
229 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
230 size_t end = my_memlen(buf, count);
231 int i;
232
233 if (end > sizeof(mydev->decimals))
234 return -EINVAL;
235
236 for (i = 0; i < end; i++)
237 if (buf[i] != '0' && buf[i] != '1')
238 return -EINVAL;
239
240 memset(mydev->decimals, 0, sizeof(mydev->decimals));
241 for (i = 0; i < end; i++)
242 if (buf[i] == '1')
243 mydev->decimals[end-1-i] = 1;
244
245 update_display_visual(mydev);
246
247 return count;
248}
249
250static DEVICE_ATTR(decimals, S_IWUGO | S_IRUGO,
251 show_attr_decimals, set_attr_decimals);
252
253static ssize_t show_attr_textmode(struct device *dev,
254 struct device_attribute *attr, char *buf)
255{
256 struct usb_interface *intf = to_usb_interface(dev);
257 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
258 int i;
259
260 buf[0] = 0;
261
262 for (i = 0; display_textmodes[i]; i++) {
263 if (mydev->textmode == i) {
264 strcat(buf, " [");
265 strcat(buf, display_textmodes[i]);
266 strcat(buf, "] ");
267 } else {
268 strcat(buf, " ");
269 strcat(buf, display_textmodes[i]);
270 strcat(buf, " ");
271 }
272 }
273 strcat(buf, "\n");
274
275
276 return strlen(buf);
277}
278
279static ssize_t set_attr_textmode(struct device *dev,
280 struct device_attribute *attr, const char *buf, size_t count)
281{
282 struct usb_interface *intf = to_usb_interface(dev);
283 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
284 int i;
285
286 for (i = 0; display_textmodes[i]; i++) {
287 if (sysfs_streq(display_textmodes[i], buf)) {
288 mydev->textmode = i;
289 update_display_visual(mydev);
290 return count;
291 }
292 }
293
294 return -EINVAL;
295}
296
297static DEVICE_ATTR(textmode, S_IWUGO | S_IRUGO,
298 show_attr_textmode, set_attr_textmode);
299
300
301MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered);
302MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode);
303MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode);
304
305static struct attribute *dev_attrs[] = {
306 &dev_attr_powered.attr,
307 &dev_attr_text.attr,
308 &dev_attr_textmode.attr,
309 &dev_attr_decimals.attr,
310 &dev_attr_mode_msb.attr,
311 &dev_attr_mode_lsb.attr,
312 NULL
313};
314
315static struct attribute_group dev_attr_grp = {
316 .attrs = dev_attrs,
317};
318
319static int sevseg_probe(struct usb_interface *interface,
320 const struct usb_device_id *id)
321{
322 struct usb_device *udev = interface_to_usbdev(interface);
323 struct usb_sevsegdev *mydev = NULL;
324 int rc = -ENOMEM;
325
326 mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL);
327 if (mydev == NULL) {
328 dev_err(&interface->dev, "Out of memory\n");
329 goto error_mem;
330 }
331
332 mydev->udev = usb_get_dev(udev);
333 usb_set_intfdata(interface, mydev);
334
335
336 mydev->textmode = 0x02;
337 mydev->mode_msb = 0x06;
338 mydev->mode_lsb = 0x3f;
339
340 rc = sysfs_create_group(&interface->dev.kobj, &dev_attr_grp);
341 if (rc)
342 goto error;
343
344 dev_info(&interface->dev, "USB 7 Segment device now attached\n");
345 return 0;
346
347error:
348 usb_set_intfdata(interface, NULL);
349 usb_put_dev(mydev->udev);
350 kfree(mydev);
351error_mem:
352 return rc;
353}
354
355static void sevseg_disconnect(struct usb_interface *interface)
356{
357 struct usb_sevsegdev *mydev;
358
359 mydev = usb_get_intfdata(interface);
360 sysfs_remove_group(&interface->dev.kobj, &dev_attr_grp);
361 usb_set_intfdata(interface, NULL);
362 usb_put_dev(mydev->udev);
363 kfree(mydev);
364 dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
365}
366
367static struct usb_driver sevseg_driver = {
368 .name = "usbsevseg",
369 .probe = sevseg_probe,
370 .disconnect = sevseg_disconnect,
371 .id_table = id_table,
372};
373
374static int __init usb_sevseg_init(void)
375{
376 int rc = 0;
377
378 rc = usb_register(&sevseg_driver);
379 if (rc)
380 err("usb_register failed. Error number %d", rc);
381 return rc;
382}
383
384static void __exit usb_sevseg_exit(void)
385{
386 usb_deregister(&sevseg_driver);
387}
388
389module_init(usb_sevseg_init);
390module_exit(usb_sevseg_exit);
391
392MODULE_AUTHOR(DRIVER_AUTHOR);
393MODULE_DESCRIPTION(DRIVER_DESC);
394MODULE_LICENSE("GPL");
395
