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/slab.h>
16#include <linux/module.h>
17#include <linux/string.h>
18#include <linux/usb.h>
19
20
21#define DRIVER_AUTHOR "Harrison Metzger <harrisonmetz@gmail.com>"
22#define DRIVER_DESC "USB 7 Segment Driver"
23
24#define VENDOR_ID 0x0fc5
25#define PRODUCT_ID 0x1227
26#define MAXLEN 8
27
28
29static const struct usb_device_id id_table[] = {
30 { USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
31 { },
32};
33MODULE_DEVICE_TABLE(usb, id_table);
34
35
36static const char *display_textmodes[] = {"raw", "hex", "ascii"};
37
38struct usb_sevsegdev {
39 struct usb_device *udev;
40 struct usb_interface *intf;
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 u8 shadow_power;
51 u8 has_interface_pm;
52};
53
54
55
56
57
58
59static inline size_t my_memlen(const char *buf, size_t count)
60{
61 if (count > 0 && buf[count-1] == '\n')
62 return count - 1;
63 else
64 return count;
65}
66
67static void update_display_powered(struct usb_sevsegdev *mydev)
68{
69 int rc;
70
71 if (mydev->powered && !mydev->has_interface_pm) {
72 rc = usb_autopm_get_interface(mydev->intf);
73 if (rc < 0)
74 return;
75 mydev->has_interface_pm = 1;
76 }
77
78 if (mydev->shadow_power != 1)
79 return;
80
81 rc = usb_control_msg(mydev->udev,
82 usb_sndctrlpipe(mydev->udev, 0),
83 0x12,
84 0x48,
85 (80 * 0x100) + 10,
86 (0x00 * 0x100) + (mydev->powered ? 1 : 0),
87 NULL,
88 0,
89 2000);
90 if (rc < 0)
91 dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
92
93 if (!mydev->powered && mydev->has_interface_pm) {
94 usb_autopm_put_interface(mydev->intf);
95 mydev->has_interface_pm = 0;
96 }
97}
98
99static void update_display_mode(struct usb_sevsegdev *mydev)
100{
101 int rc;
102
103 if(mydev->shadow_power != 1)
104 return;
105
106 rc = usb_control_msg(mydev->udev,
107 usb_sndctrlpipe(mydev->udev, 0),
108 0x12,
109 0x48,
110 (82 * 0x100) + 10,
111 (mydev->mode_msb * 0x100) + mydev->mode_lsb,
112 NULL,
113 0,
114 2000);
115
116 if (rc < 0)
117 dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
118}
119
120static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
121{
122 int rc;
123 int i;
124 unsigned char *buffer;
125 u8 decimals = 0;
126
127 if(mydev->shadow_power != 1)
128 return;
129
130 buffer = kzalloc(MAXLEN, mf);
131 if (!buffer)
132 return;
133
134
135 for (i = 0; i < mydev->textlength; i++)
136 buffer[i] = mydev->text[mydev->textlength-1-i];
137
138 rc = usb_control_msg(mydev->udev,
139 usb_sndctrlpipe(mydev->udev, 0),
140 0x12,
141 0x48,
142 (85 * 0x100) + 10,
143 (0 * 0x100) + mydev->textmode,
144 buffer,
145 mydev->textlength,
146 2000);
147
148 if (rc < 0)
149 dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
150
151 kfree(buffer);
152
153
154 for (i = 0; i < sizeof(mydev->decimals); i++)
155 decimals |= mydev->decimals[i] << i;
156
157 rc = usb_control_msg(mydev->udev,
158 usb_sndctrlpipe(mydev->udev, 0),
159 0x12,
160 0x48,
161 (86 * 0x100) + 10,
162 (0 * 0x100) + decimals,
163 NULL,
164 0,
165 2000);
166
167 if (rc < 0)
168 dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
169}
170
171#define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn) \
172static ssize_t show_attr_##name(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 sprintf(buf, "%u\n", mydev->name); \
179} \
180 \
181static ssize_t set_attr_##name(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 \
187 mydev->name = simple_strtoul(buf, NULL, 10); \
188 update_fcn(mydev); \
189 \
190 return count; \
191} \
192static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_attr_##name, set_attr_##name);
193
194static ssize_t show_attr_text(struct device *dev,
195 struct device_attribute *attr, char *buf)
196{
197 struct usb_interface *intf = to_usb_interface(dev);
198 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
199
200 return snprintf(buf, mydev->textlength, "%s\n", mydev->text);
201}
202
203static ssize_t set_attr_text(struct device *dev,
204 struct device_attribute *attr, const char *buf, size_t count)
205{
206 struct usb_interface *intf = to_usb_interface(dev);
207 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
208 size_t end = my_memlen(buf, count);
209
210 if (end > sizeof(mydev->text))
211 return -EINVAL;
212
213 memset(mydev->text, 0, sizeof(mydev->text));
214 mydev->textlength = end;
215
216 if (end > 0)
217 memcpy(mydev->text, buf, end);
218
219 update_display_visual(mydev, GFP_KERNEL);
220 return count;
221}
222
223static DEVICE_ATTR(text, S_IRUGO | S_IWUSR, show_attr_text, set_attr_text);
224
225static ssize_t show_attr_decimals(struct device *dev,
226 struct device_attribute *attr, char *buf)
227{
228 struct usb_interface *intf = to_usb_interface(dev);
229 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
230 int i;
231 int pos;
232
233 for (i = 0; i < sizeof(mydev->decimals); i++) {
234 pos = sizeof(mydev->decimals) - 1 - i;
235 if (mydev->decimals[i] == 0)
236 buf[pos] = '0';
237 else if (mydev->decimals[i] == 1)
238 buf[pos] = '1';
239 else
240 buf[pos] = 'x';
241 }
242
243 buf[sizeof(mydev->decimals)] = '\n';
244 return sizeof(mydev->decimals) + 1;
245}
246
247static ssize_t set_attr_decimals(struct device *dev,
248 struct device_attribute *attr, const char *buf, size_t count)
249{
250 struct usb_interface *intf = to_usb_interface(dev);
251 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
252 size_t end = my_memlen(buf, count);
253 int i;
254
255 if (end > sizeof(mydev->decimals))
256 return -EINVAL;
257
258 for (i = 0; i < end; i++)
259 if (buf[i] != '0' && buf[i] != '1')
260 return -EINVAL;
261
262 memset(mydev->decimals, 0, sizeof(mydev->decimals));
263 for (i = 0; i < end; i++)
264 if (buf[i] == '1')
265 mydev->decimals[end-1-i] = 1;
266
267 update_display_visual(mydev, GFP_KERNEL);
268
269 return count;
270}
271
272static DEVICE_ATTR(decimals, S_IRUGO | S_IWUSR, show_attr_decimals, set_attr_decimals);
273
274static ssize_t show_attr_textmode(struct device *dev,
275 struct device_attribute *attr, char *buf)
276{
277 struct usb_interface *intf = to_usb_interface(dev);
278 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
279 int i;
280
281 buf[0] = 0;
282
283 for (i = 0; i < ARRAY_SIZE(display_textmodes); i++) {
284 if (mydev->textmode == i) {
285 strcat(buf, " [");
286 strcat(buf, display_textmodes[i]);
287 strcat(buf, "] ");
288 } else {
289 strcat(buf, " ");
290 strcat(buf, display_textmodes[i]);
291 strcat(buf, " ");
292 }
293 }
294 strcat(buf, "\n");
295
296
297 return strlen(buf);
298}
299
300static ssize_t set_attr_textmode(struct device *dev,
301 struct device_attribute *attr, const char *buf, size_t count)
302{
303 struct usb_interface *intf = to_usb_interface(dev);
304 struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
305 int i;
306
307 i = sysfs_match_string(display_textmodes, buf);
308 if (i < 0)
309 return i;
310
311 mydev->textmode = i;
312 update_display_visual(mydev, GFP_KERNEL);
313 return count;
314}
315
316static DEVICE_ATTR(textmode, S_IRUGO | S_IWUSR, show_attr_textmode, set_attr_textmode);
317
318
319MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered);
320MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode);
321MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode);
322
323static struct attribute *dev_attrs[] = {
324 &dev_attr_powered.attr,
325 &dev_attr_text.attr,
326 &dev_attr_textmode.attr,
327 &dev_attr_decimals.attr,
328 &dev_attr_mode_msb.attr,
329 &dev_attr_mode_lsb.attr,
330 NULL
331};
332
333static const struct attribute_group dev_attr_grp = {
334 .attrs = dev_attrs,
335};
336
337static int sevseg_probe(struct usb_interface *interface,
338 const struct usb_device_id *id)
339{
340 struct usb_device *udev = interface_to_usbdev(interface);
341 struct usb_sevsegdev *mydev = NULL;
342 int rc = -ENOMEM;
343
344 mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL);
345 if (!mydev)
346 goto error_mem;
347
348 mydev->udev = usb_get_dev(udev);
349 mydev->intf = interface;
350 usb_set_intfdata(interface, mydev);
351
352
353 mydev->shadow_power = 1;
354 mydev->has_interface_pm = 0;
355
356
357 mydev->textmode = 0x02;
358 mydev->mode_msb = 0x06;
359 mydev->mode_lsb = 0x3f;
360
361 rc = sysfs_create_group(&interface->dev.kobj, &dev_attr_grp);
362 if (rc)
363 goto error;
364
365 dev_info(&interface->dev, "USB 7 Segment device now attached\n");
366 return 0;
367
368error:
369 usb_set_intfdata(interface, NULL);
370 usb_put_dev(mydev->udev);
371 kfree(mydev);
372error_mem:
373 return rc;
374}
375
376static void sevseg_disconnect(struct usb_interface *interface)
377{
378 struct usb_sevsegdev *mydev;
379
380 mydev = usb_get_intfdata(interface);
381 sysfs_remove_group(&interface->dev.kobj, &dev_attr_grp);
382 usb_set_intfdata(interface, NULL);
383 usb_put_dev(mydev->udev);
384 kfree(mydev);
385 dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
386}
387
388static int sevseg_suspend(struct usb_interface *intf, pm_message_t message)
389{
390 struct usb_sevsegdev *mydev;
391
392 mydev = usb_get_intfdata(intf);
393 mydev->shadow_power = 0;
394
395 return 0;
396}
397
398static int sevseg_resume(struct usb_interface *intf)
399{
400 struct usb_sevsegdev *mydev;
401
402 mydev = usb_get_intfdata(intf);
403 mydev->shadow_power = 1;
404 update_display_mode(mydev);
405 update_display_visual(mydev, GFP_NOIO);
406
407 return 0;
408}
409
410static int sevseg_reset_resume(struct usb_interface *intf)
411{
412 struct usb_sevsegdev *mydev;
413
414 mydev = usb_get_intfdata(intf);
415 mydev->shadow_power = 1;
416 update_display_mode(mydev);
417 update_display_visual(mydev, GFP_NOIO);
418
419 return 0;
420}
421
422static struct usb_driver sevseg_driver = {
423 .name = "usbsevseg",
424 .probe = sevseg_probe,
425 .disconnect = sevseg_disconnect,
426 .suspend = sevseg_suspend,
427 .resume = sevseg_resume,
428 .reset_resume = sevseg_reset_resume,
429 .id_table = id_table,
430 .supports_autosuspend = 1,
431};
432
433module_usb_driver(sevseg_driver);
434
435MODULE_AUTHOR(DRIVER_AUTHOR);
436MODULE_DESCRIPTION(DRIVER_DESC);
437MODULE_LICENSE("GPL");
438
