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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 8
28
29
30static const 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 struct usb_interface *intf;
42
43 u8 powered;
44 u8 mode_msb;
45 u8 mode_lsb;
46 u8 decimals[MAXLEN];
47 u8 textmode;
48 u8 text[MAXLEN];
49 u16 textlength;
50
51 u8 shadow_power;
52 u8 has_interface_pm;
53};
54
55
56
57
58
59
60inline size_t my_memlen(const char *buf, size_t count)
61{
62 if (count > 0 && buf[count-1] == '\n')
63 return count - 1;
64 else
65 return count;
66}
67
68static void update_display_powered(struct usb_sevsegdev *mydev)
69{
70 int rc;
71
72 if (mydev->powered && !mydev->has_interface_pm) {
73 rc = usb_autopm_get_interface(mydev->intf);
74 if (rc < 0)
75 return;
76 mydev->has_interface_pm = 1;
77 }
78
79 if (mydev->shadow_power != 1)
80 return;
81
82 rc = usb_control_msg(mydev->udev,
83 usb_sndctrlpipe(mydev->udev, 0),
84 0x12,
85 0x48,
86 (80 * 0x100) + 10,
87 (0x00 * 0x100) + (mydev->powered ? 1 : 0),
88 NULL,
89 0,
90 2000);
91 if (rc < 0)
92 dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
93
94 if (!mydev->powered && mydev->has_interface_pm) {
95 usb_autopm_put_interface(mydev->intf);
96 mydev->has_interface_pm = 0;
97 }
98}
99
100static void update_display_mode(struct usb_sevsegdev *mydev)
101{
102 int rc;
103
104 if(mydev->shadow_power != 1)
105 return;
106
107 rc = usb_control_msg(mydev->udev,
108 usb_sndctrlpipe(mydev->udev, 0),
109 0x12,
110 0x48,
111 (82 * 0x100) + 10,
112 (mydev->mode_msb * 0x100) + mydev->mode_lsb,
113 NULL,
114 0,
115 2000);
116
117 if (rc < 0)
118 dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
119}
120
121static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
122{
123 int rc;
124 int i;
125 unsigned char *buffer;
126 u8 decimals = 0;
127
128 if(mydev->shadow_power != 1)
129 return;
130
131 buffer = kzalloc(MAXLEN, mf);
132 if (!buffer) {
133 dev_err(&mydev->udev->dev, "out of memory\n");
134 return;
135 }
136
137
138 for (i = 0; i < mydev->textlength; i++)
139 buffer[i] = mydev->text[mydev->textlength-1-i];
140
141 rc = usb_control_msg(mydev->udev,
142 usb_sndctrlpipe(mydev->udev, 0),
143 0x12,
144 0x48,
145 (85 * 0x100) + 10,
146 (0 * 0x100) + mydev->textmode,
147 buffer,
148 mydev->textlength,
149 2000);
150
151 if (rc < 0)
152 dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
153
154 kfree(buffer);
155
156
157 for (i = 0; i < sizeof(mydev->decimals); i++)
158 decimals |= mydev->decimals[i] << i;
159
160 rc = usb_control_msg(mydev->udev,
161 usb_sndctrlpipe(mydev->udev, 0),
162 0x12,
163 0x48,
164 (86 * 0x100) + 10,
165 (0 * 0x100) + decimals,
166 NULL,
167 0,
168 2000);
169
170 if (rc < 0)
171 dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
172}
173
174#define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn) \
175static ssize_t show_attr_##name(struct device *dev, \
176 struct device_attribute *attr, char *buf) \
177{ \
178 struct usb_interface *intf = to_usb_interface(dev); \
179 struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
180 \
181 return sprintf(buf, "%u\n", mydev->name); \
182} \
183 \
184static ssize_t set_attr_##name(struct device *dev, \
185 struct device_attribute *attr, const char *buf, size_t count) \
186{ \
187 struct usb_interface *intf = to_usb_interface(dev); \
188 struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
189 \
190 mydev->name = simple_strtoul(buf, NULL, 10); \
191 update_fcn(mydev); \
192 \
193 return count; \
194} \
195static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_attr_##name, set_attr_##name);
196
197static ssize_t show_attr_text(struct device *dev,
198 struct device_attribute *attr, char *buf)
199{
200 struct usb_interface *intf = to_usb_interface(dev);
201 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
202
203 return snprintf(buf, mydev->textlength, "%s\n", mydev->text);
204}
205
206static ssize_t set_attr_text(struct device *dev,
207 struct device_attribute *attr, const char *buf, size_t count)
208{
209 struct usb_interface *intf = to_usb_interface(dev);
210 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
211 size_t end = my_memlen(buf, count);
212
213 if (end > sizeof(mydev->text))
214 return -EINVAL;
215
216 memset(mydev->text, 0, sizeof(mydev->text));
217 mydev->textlength = end;
218
219 if (end > 0)
220 memcpy(mydev->text, buf, end);
221
222 update_display_visual(mydev, GFP_KERNEL);
223 return count;
224}
225
226static DEVICE_ATTR(text, S_IRUGO | S_IWUSR, show_attr_text, set_attr_text);
227
228static ssize_t show_attr_decimals(struct device *dev,
229 struct device_attribute *attr, char *buf)
230{
231 struct usb_interface *intf = to_usb_interface(dev);
232 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
233 int i;
234 int pos;
235
236 for (i = 0; i < sizeof(mydev->decimals); i++) {
237 pos = sizeof(mydev->decimals) - 1 - i;
238 if (mydev->decimals[i] == 0)
239 buf[pos] = '0';
240 else if (mydev->decimals[i] == 1)
241 buf[pos] = '1';
242 else
243 buf[pos] = 'x';
244 }
245
246 buf[sizeof(mydev->decimals)] = '\n';
247 return sizeof(mydev->decimals) + 1;
248}
249
250static ssize_t set_attr_decimals(struct device *dev,
251 struct device_attribute *attr, const char *buf, size_t count)
252{
253 struct usb_interface *intf = to_usb_interface(dev);
254 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
255 size_t end = my_memlen(buf, count);
256 int i;
257
258 if (end > sizeof(mydev->decimals))
259 return -EINVAL;
260
261 for (i = 0; i < end; i++)
262 if (buf[i] != '0' && buf[i] != '1')
263 return -EINVAL;
264
265 memset(mydev->decimals, 0, sizeof(mydev->decimals));
266 for (i = 0; i < end; i++)
267 if (buf[i] == '1')
268 mydev->decimals[end-1-i] = 1;
269
270 update_display_visual(mydev, GFP_KERNEL);
271
272 return count;
273}
274
275static DEVICE_ATTR(decimals, S_IRUGO | S_IWUSR, show_attr_decimals, set_attr_decimals);
276
277static ssize_t show_attr_textmode(struct device *dev,
278 struct device_attribute *attr, char *buf)
279{
280 struct usb_interface *intf = to_usb_interface(dev);
281 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
282 int i;
283
284 buf[0] = 0;
285
286 for (i = 0; display_textmodes[i]; i++) {
287 if (mydev->textmode == i) {
288 strcat(buf, " [");
289 strcat(buf, display_textmodes[i]);
290 strcat(buf, "] ");
291 } else {
292 strcat(buf, " ");
293 strcat(buf, display_textmodes[i]);
294 strcat(buf, " ");
295 }
296 }
297 strcat(buf, "\n");
298
299
300 return strlen(buf);
301}
302
303static ssize_t set_attr_textmode(struct device *dev,
304 struct device_attribute *attr, const char *buf, size_t count)
305{
306 struct usb_interface *intf = to_usb_interface(dev);
307 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
308 int i;
309
310 for (i = 0; display_textmodes[i]; i++) {
311 if (sysfs_streq(display_textmodes[i], buf)) {
312 mydev->textmode = i;
313 update_display_visual(mydev, GFP_KERNEL);
314 return count;
315 }
316 }
317
318 return -EINVAL;
319}
320
321static DEVICE_ATTR(textmode, S_IRUGO | S_IWUSR, show_attr_textmode, set_attr_textmode);
322
323
324MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered);
325MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode);
326MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode);
327
328static struct attribute *dev_attrs[] = {
329 &dev_attr_powered.attr,
330 &dev_attr_text.attr,
331 &dev_attr_textmode.attr,
332 &dev_attr_decimals.attr,
333 &dev_attr_mode_msb.attr,
334 &dev_attr_mode_lsb.attr,
335 NULL
336};
337
338static struct attribute_group dev_attr_grp = {
339 .attrs = dev_attrs,
340};
341
342static int sevseg_probe(struct usb_interface *interface,
343 const struct usb_device_id *id)
344{
345 struct usb_device *udev = interface_to_usbdev(interface);
346 struct usb_sevsegdev *mydev = NULL;
347 int rc = -ENOMEM;
348
349 mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL);
350 if (mydev == NULL) {
351 dev_err(&interface->dev, "Out of memory\n");
352 goto error_mem;
353 }
354
355 mydev->udev = usb_get_dev(udev);
356 mydev->intf = interface;
357 usb_set_intfdata(interface, mydev);
358
359
360 mydev->shadow_power = 1;
361 mydev->has_interface_pm = 0;
362
363
364 mydev->textmode = 0x02;
365 mydev->mode_msb = 0x06;
366 mydev->mode_lsb = 0x3f;
367
368 rc = sysfs_create_group(&interface->dev.kobj, &dev_attr_grp);
369 if (rc)
370 goto error;
371
372 dev_info(&interface->dev, "USB 7 Segment device now attached\n");
373 return 0;
374
375error:
376 usb_set_intfdata(interface, NULL);
377 usb_put_dev(mydev->udev);
378 kfree(mydev);
379error_mem:
380 return rc;
381}
382
383static void sevseg_disconnect(struct usb_interface *interface)
384{
385 struct usb_sevsegdev *mydev;
386
387 mydev = usb_get_intfdata(interface);
388 sysfs_remove_group(&interface->dev.kobj, &dev_attr_grp);
389 usb_set_intfdata(interface, NULL);
390 usb_put_dev(mydev->udev);
391 kfree(mydev);
392 dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
393}
394
395static int sevseg_suspend(struct usb_interface *intf, pm_message_t message)
396{
397 struct usb_sevsegdev *mydev;
398
399 mydev = usb_get_intfdata(intf);
400 mydev->shadow_power = 0;
401
402 return 0;
403}
404
405static int sevseg_resume(struct usb_interface *intf)
406{
407 struct usb_sevsegdev *mydev;
408
409 mydev = usb_get_intfdata(intf);
410 mydev->shadow_power = 1;
411 update_display_mode(mydev);
412 update_display_visual(mydev, GFP_NOIO);
413
414 return 0;
415}
416
417static int sevseg_reset_resume(struct usb_interface *intf)
418{
419 struct usb_sevsegdev *mydev;
420
421 mydev = usb_get_intfdata(intf);
422 mydev->shadow_power = 1;
423 update_display_mode(mydev);
424 update_display_visual(mydev, GFP_NOIO);
425
426 return 0;
427}
428
429static struct usb_driver sevseg_driver = {
430 .name = "usbsevseg",
431 .probe = sevseg_probe,
432 .disconnect = sevseg_disconnect,
433 .suspend = sevseg_suspend,
434 .resume = sevseg_resume,
435 .reset_resume = sevseg_reset_resume,
436 .id_table = id_table,
437 .supports_autosuspend = 1,
438};
439
440module_usb_driver(sevseg_driver);
441
442MODULE_AUTHOR(DRIVER_AUTHOR);
443MODULE_DESCRIPTION(DRIVER_DESC);
444MODULE_LICENSE("GPL");
445
