1 /*
2 * USB 7 Segment Driver
3 *
4 * Copyright (C) 2008 Harrison Metzger <harrisonmetz@gmail.com>
5 * Based on usbled.c by Greg Kroah-Hartman (greg@kroah.com)
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation, version 2.
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 /* table of devices that work with this driver */
29 static const struct usb_device_id id_table[] = {
30 { USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
31 { },
32 };
33 MODULE_DEVICE_TABLE(usb, id_table);
34
35 /* the different text display modes the device is capable of */
36 static char *display_textmodes[] = {"raw", "hex", "ascii", NULL};
37
38 struct 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; /* for PM */
51 u8 has_interface_pm;
52 };
53
54 /* sysfs_streq can't replace this completely
55 * If the device was in hex mode, and the user wanted a 0,
56 * if str commands are used, we would assume the end of string
57 * so mem commands are used.
58 */
my_memlen(const char * buf,size_t count)59 static 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
update_display_powered(struct usb_sevsegdev * mydev)67 static 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, /* (power mode) */
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
update_display_mode(struct usb_sevsegdev * mydev)99 static 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, /* (set mode) */
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
update_display_visual(struct usb_sevsegdev * mydev,gfp_t mf)120 static 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 /* The device is right to left, where as you write left to right */
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, /* (write text) */
143 (0 * 0x100) + mydev->textmode, /* mode */
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 /* The device is right to left, where as you write left to right */
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, /* (set decimal) */
162 (0 * 0x100) + decimals, /* 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) \
172 static 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 \
181 static 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 } \
192 static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_attr_##name, set_attr_##name);
193
show_attr_text(struct device * dev,struct device_attribute * attr,char * buf)194 static 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
set_attr_text(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)203 static 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
223 static DEVICE_ATTR(text, S_IRUGO | S_IWUSR, show_attr_text, set_attr_text);
224
show_attr_decimals(struct device * dev,struct device_attribute * attr,char * buf)225 static 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
set_attr_decimals(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)247 static 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
272 static DEVICE_ATTR(decimals, S_IRUGO | S_IWUSR, show_attr_decimals, set_attr_decimals);
273
show_attr_textmode(struct device * dev,struct device_attribute * attr,char * buf)274 static 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; display_textmodes[i]; 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
set_attr_textmode(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)300 static 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 for (i = 0; display_textmodes[i]; i++) {
308 if (sysfs_streq(display_textmodes[i], buf)) {
309 mydev->textmode = i;
310 update_display_visual(mydev, GFP_KERNEL);
311 return count;
312 }
313 }
314
315 return -EINVAL;
316 }
317
318 static DEVICE_ATTR(textmode, S_IRUGO | S_IWUSR, show_attr_textmode, set_attr_textmode);
319
320
321 MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered);
322 MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode);
323 MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode);
324
325 static struct attribute *dev_attrs[] = {
326 &dev_attr_powered.attr,
327 &dev_attr_text.attr,
328 &dev_attr_textmode.attr,
329 &dev_attr_decimals.attr,
330 &dev_attr_mode_msb.attr,
331 &dev_attr_mode_lsb.attr,
332 NULL
333 };
334
335 static struct attribute_group dev_attr_grp = {
336 .attrs = dev_attrs,
337 };
338
sevseg_probe(struct usb_interface * interface,const struct usb_device_id * id)339 static int sevseg_probe(struct usb_interface *interface,
340 const struct usb_device_id *id)
341 {
342 struct usb_device *udev = interface_to_usbdev(interface);
343 struct usb_sevsegdev *mydev = NULL;
344 int rc = -ENOMEM;
345
346 mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL);
347 if (!mydev)
348 goto error_mem;
349
350 mydev->udev = usb_get_dev(udev);
351 mydev->intf = interface;
352 usb_set_intfdata(interface, mydev);
353
354 /* PM */
355 mydev->shadow_power = 1; /* currently active */
356 mydev->has_interface_pm = 0; /* have not issued autopm_get */
357
358 /*set defaults */
359 mydev->textmode = 0x02; /* ascii mode */
360 mydev->mode_msb = 0x06; /* 6 characters */
361 mydev->mode_lsb = 0x3f; /* scanmode for 6 chars */
362
363 rc = sysfs_create_group(&interface->dev.kobj, &dev_attr_grp);
364 if (rc)
365 goto error;
366
367 dev_info(&interface->dev, "USB 7 Segment device now attached\n");
368 return 0;
369
370 error:
371 usb_set_intfdata(interface, NULL);
372 usb_put_dev(mydev->udev);
373 kfree(mydev);
374 error_mem:
375 return rc;
376 }
377
sevseg_disconnect(struct usb_interface * interface)378 static void sevseg_disconnect(struct usb_interface *interface)
379 {
380 struct usb_sevsegdev *mydev;
381
382 mydev = usb_get_intfdata(interface);
383 sysfs_remove_group(&interface->dev.kobj, &dev_attr_grp);
384 usb_set_intfdata(interface, NULL);
385 usb_put_dev(mydev->udev);
386 kfree(mydev);
387 dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
388 }
389
sevseg_suspend(struct usb_interface * intf,pm_message_t message)390 static int sevseg_suspend(struct usb_interface *intf, pm_message_t message)
391 {
392 struct usb_sevsegdev *mydev;
393
394 mydev = usb_get_intfdata(intf);
395 mydev->shadow_power = 0;
396
397 return 0;
398 }
399
sevseg_resume(struct usb_interface * intf)400 static int sevseg_resume(struct usb_interface *intf)
401 {
402 struct usb_sevsegdev *mydev;
403
404 mydev = usb_get_intfdata(intf);
405 mydev->shadow_power = 1;
406 update_display_mode(mydev);
407 update_display_visual(mydev, GFP_NOIO);
408
409 return 0;
410 }
411
sevseg_reset_resume(struct usb_interface * intf)412 static int sevseg_reset_resume(struct usb_interface *intf)
413 {
414 struct usb_sevsegdev *mydev;
415
416 mydev = usb_get_intfdata(intf);
417 mydev->shadow_power = 1;
418 update_display_mode(mydev);
419 update_display_visual(mydev, GFP_NOIO);
420
421 return 0;
422 }
423
424 static struct usb_driver sevseg_driver = {
425 .name = "usbsevseg",
426 .probe = sevseg_probe,
427 .disconnect = sevseg_disconnect,
428 .suspend = sevseg_suspend,
429 .resume = sevseg_resume,
430 .reset_resume = sevseg_reset_resume,
431 .id_table = id_table,
432 .supports_autosuspend = 1,
433 };
434
435 module_usb_driver(sevseg_driver);
436
437 MODULE_AUTHOR(DRIVER_AUTHOR);
438 MODULE_DESCRIPTION(DRIVER_DESC);
439 MODULE_LICENSE("GPL");
440