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