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eb86be54 HM |
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> | |
eb86be54 HM |
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 | |
1097cceb | 26 | #define MAXLEN 8 |
eb86be54 HM |
27 | |
28 | /* table of devices that work with this driver */ | |
33b9e162 | 29 | static const struct usb_device_id id_table[] = { |
eb86be54 HM |
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; | |
4d155eb5 | 40 | struct usb_interface *intf; |
eb86be54 HM |
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; | |
4d155eb5 ON |
49 | |
50 | u8 shadow_power; /* for PM */ | |
4c1f5c88 | 51 | u8 has_interface_pm; |
eb86be54 HM |
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 | */ | |
ff4708e6 | 59 | static inline size_t my_memlen(const char *buf, size_t count) |
eb86be54 HM |
60 | { |
61 | if (count > 0 && buf[count-1] == '\n') | |
62 | return count - 1; | |
63 | else | |
64 | return count; | |
65 | } | |
66 | ||
67 | static void update_display_powered(struct usb_sevsegdev *mydev) | |
68 | { | |
69 | int rc; | |
70 | ||
4c1f5c88 | 71 | if (mydev->powered && !mydev->has_interface_pm) { |
4d155eb5 ON |
72 | rc = usb_autopm_get_interface(mydev->intf); |
73 | if (rc < 0) | |
74 | return; | |
4c1f5c88 | 75 | mydev->has_interface_pm = 1; |
4d155eb5 ON |
76 | } |
77 | ||
4c1f5c88 HM |
78 | if (mydev->shadow_power != 1) |
79 | return; | |
80 | ||
eb86be54 HM |
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); | |
4d155eb5 | 92 | |
4c1f5c88 | 93 | if (!mydev->powered && mydev->has_interface_pm) { |
4d155eb5 | 94 | usb_autopm_put_interface(mydev->intf); |
4c1f5c88 HM |
95 | mydev->has_interface_pm = 0; |
96 | } | |
eb86be54 HM |
97 | } |
98 | ||
99 | static void update_display_mode(struct usb_sevsegdev *mydev) | |
100 | { | |
101 | int rc; | |
102 | ||
4d155eb5 ON |
103 | if(mydev->shadow_power != 1) |
104 | return; | |
105 | ||
eb86be54 HM |
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 | ||
4d155eb5 | 120 | static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf) |
eb86be54 HM |
121 | { |
122 | int rc; | |
123 | int i; | |
124 | unsigned char *buffer; | |
125 | u8 decimals = 0; | |
126 | ||
4d155eb5 ON |
127 | if(mydev->shadow_power != 1) |
128 | return; | |
129 | ||
130 | buffer = kzalloc(MAXLEN, mf); | |
eb86be54 HM |
131 | if (!buffer) { |
132 | dev_err(&mydev->udev->dev, "out of memory\n"); | |
133 | return; | |
134 | } | |
135 | ||
136 | /* The device is right to left, where as you write left to right */ | |
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, /* (write text) */ | |
145 | (0 * 0x100) + mydev->textmode, /* mode */ | |
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 | /* The device is right to left, where as you write left to right */ | |
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, /* (set decimal) */ | |
164 | (0 * 0x100) + decimals, /* 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) \ | |
174 | static 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 | \ | |
183 | static 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); \ | |
4d155eb5 | 190 | update_fcn(mydev); \ |
eb86be54 HM |
191 | \ |
192 | return count; \ | |
193 | } \ | |
e24d7ace | 194 | static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_attr_##name, set_attr_##name); |
eb86be54 HM |
195 | |
196 | static 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 | ||
205 | static 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 | ||
4d155eb5 | 221 | update_display_visual(mydev, GFP_KERNEL); |
eb86be54 HM |
222 | return count; |
223 | } | |
224 | ||
e24d7ace | 225 | static DEVICE_ATTR(text, S_IRUGO | S_IWUSR, show_attr_text, set_attr_text); |
eb86be54 HM |
226 | |
227 | static 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 | ||
249 | static 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 | ||
4d155eb5 | 269 | update_display_visual(mydev, GFP_KERNEL); |
eb86be54 HM |
270 | |
271 | return count; | |
272 | } | |
273 | ||
e24d7ace | 274 | static DEVICE_ATTR(decimals, S_IRUGO | S_IWUSR, show_attr_decimals, set_attr_decimals); |
eb86be54 HM |
275 | |
276 | static 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 | ||
302 | static 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; | |
4d155eb5 | 312 | update_display_visual(mydev, GFP_KERNEL); |
eb86be54 HM |
313 | return count; |
314 | } | |
315 | } | |
316 | ||
317 | return -EINVAL; | |
318 | } | |
319 | ||
e24d7ace | 320 | static DEVICE_ATTR(textmode, S_IRUGO | S_IWUSR, show_attr_textmode, set_attr_textmode); |
eb86be54 HM |
321 | |
322 | ||
323 | MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered); | |
324 | MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode); | |
325 | MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode); | |
326 | ||
327 | static 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 | ||
337 | static struct attribute_group dev_attr_grp = { | |
338 | .attrs = dev_attrs, | |
339 | }; | |
340 | ||
341 | static 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); | |
4d155eb5 | 355 | mydev->intf = interface; |
eb86be54 HM |
356 | usb_set_intfdata(interface, mydev); |
357 | ||
4c1f5c88 HM |
358 | /* PM */ |
359 | mydev->shadow_power = 1; /* currently active */ | |
360 | mydev->has_interface_pm = 0; /* have not issued autopm_get */ | |
361 | ||
eb86be54 HM |
362 | /*set defaults */ |
363 | mydev->textmode = 0x02; /* ascii mode */ | |
364 | mydev->mode_msb = 0x06; /* 6 characters */ | |
365 | mydev->mode_lsb = 0x3f; /* scanmode for 6 chars */ | |
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 | ||
374 | error: | |
375 | usb_set_intfdata(interface, NULL); | |
376 | usb_put_dev(mydev->udev); | |
377 | kfree(mydev); | |
378 | error_mem: | |
379 | return rc; | |
380 | } | |
381 | ||
382 | static 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 | ||
4d155eb5 ON |
394 | static 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 | ||
404 | static 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 | ||
416 | static 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 | ||
eb86be54 HM |
428 | static struct usb_driver sevseg_driver = { |
429 | .name = "usbsevseg", | |
430 | .probe = sevseg_probe, | |
431 | .disconnect = sevseg_disconnect, | |
4d155eb5 ON |
432 | .suspend = sevseg_suspend, |
433 | .resume = sevseg_resume, | |
434 | .reset_resume = sevseg_reset_resume, | |
eb86be54 | 435 | .id_table = id_table, |
4d155eb5 | 436 | .supports_autosuspend = 1, |
eb86be54 HM |
437 | }; |
438 | ||
65db4305 | 439 | module_usb_driver(sevseg_driver); |
eb86be54 HM |
440 | |
441 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
442 | MODULE_DESCRIPTION(DRIVER_DESC); | |
443 | MODULE_LICENSE("GPL"); |