Commit | Line | Data |
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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
eb86be54 HM |
2 | /* |
3 | * USB 7 Segment Driver | |
4 | * | |
5 | * Copyright (C) 2008 Harrison Metzger <harrisonmetz@gmail.com> | |
6 | * Based on usbled.c by Greg Kroah-Hartman (greg@kroah.com) | |
eb86be54 HM |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/errno.h> | |
eb86be54 HM |
11 | #include <linux/slab.h> |
12 | #include <linux/module.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/usb.h> | |
15 | ||
16 | ||
17 | #define DRIVER_AUTHOR "Harrison Metzger <harrisonmetz@gmail.com>" | |
18 | #define DRIVER_DESC "USB 7 Segment Driver" | |
19 | ||
20 | #define VENDOR_ID 0x0fc5 | |
21 | #define PRODUCT_ID 0x1227 | |
1097cceb | 22 | #define MAXLEN 8 |
eb86be54 HM |
23 | |
24 | /* table of devices that work with this driver */ | |
33b9e162 | 25 | static const struct usb_device_id id_table[] = { |
eb86be54 HM |
26 | { USB_DEVICE(VENDOR_ID, PRODUCT_ID) }, |
27 | { }, | |
28 | }; | |
29 | MODULE_DEVICE_TABLE(usb, id_table); | |
30 | ||
31 | /* the different text display modes the device is capable of */ | |
0bd08fc8 | 32 | static const char *display_textmodes[] = {"raw", "hex", "ascii"}; |
eb86be54 HM |
33 | |
34 | struct usb_sevsegdev { | |
35 | struct usb_device *udev; | |
4d155eb5 | 36 | struct usb_interface *intf; |
eb86be54 HM |
37 | |
38 | u8 powered; | |
39 | u8 mode_msb; | |
40 | u8 mode_lsb; | |
41 | u8 decimals[MAXLEN]; | |
42 | u8 textmode; | |
43 | u8 text[MAXLEN]; | |
44 | u16 textlength; | |
4d155eb5 ON |
45 | |
46 | u8 shadow_power; /* for PM */ | |
4c1f5c88 | 47 | u8 has_interface_pm; |
eb86be54 HM |
48 | }; |
49 | ||
50 | /* sysfs_streq can't replace this completely | |
51 | * If the device was in hex mode, and the user wanted a 0, | |
52 | * if str commands are used, we would assume the end of string | |
53 | * so mem commands are used. | |
54 | */ | |
ff4708e6 | 55 | static inline size_t my_memlen(const char *buf, size_t count) |
eb86be54 HM |
56 | { |
57 | if (count > 0 && buf[count-1] == '\n') | |
58 | return count - 1; | |
59 | else | |
60 | return count; | |
61 | } | |
62 | ||
63 | static void update_display_powered(struct usb_sevsegdev *mydev) | |
64 | { | |
65 | int rc; | |
66 | ||
4c1f5c88 | 67 | if (mydev->powered && !mydev->has_interface_pm) { |
4d155eb5 ON |
68 | rc = usb_autopm_get_interface(mydev->intf); |
69 | if (rc < 0) | |
70 | return; | |
4c1f5c88 | 71 | mydev->has_interface_pm = 1; |
4d155eb5 ON |
72 | } |
73 | ||
4c1f5c88 HM |
74 | if (mydev->shadow_power != 1) |
75 | return; | |
76 | ||
38833cbd AT |
77 | rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48, |
78 | (80 * 0x100) + 10, /* (power mode) */ | |
79 | (0x00 * 0x100) + (mydev->powered ? 1 : 0), | |
80 | NULL, 0, 2000, GFP_KERNEL); | |
eb86be54 HM |
81 | if (rc < 0) |
82 | dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc); | |
4d155eb5 | 83 | |
4c1f5c88 | 84 | if (!mydev->powered && mydev->has_interface_pm) { |
4d155eb5 | 85 | usb_autopm_put_interface(mydev->intf); |
4c1f5c88 HM |
86 | mydev->has_interface_pm = 0; |
87 | } | |
eb86be54 HM |
88 | } |
89 | ||
90 | static void update_display_mode(struct usb_sevsegdev *mydev) | |
91 | { | |
92 | int rc; | |
93 | ||
4d155eb5 ON |
94 | if(mydev->shadow_power != 1) |
95 | return; | |
96 | ||
38833cbd AT |
97 | rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48, |
98 | (82 * 0x100) + 10, /* (set mode) */ | |
99 | (mydev->mode_msb * 0x100) + mydev->mode_lsb, | |
100 | NULL, 0, 2000, GFP_NOIO); | |
eb86be54 HM |
101 | |
102 | if (rc < 0) | |
103 | dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc); | |
104 | } | |
105 | ||
4d155eb5 | 106 | static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf) |
eb86be54 HM |
107 | { |
108 | int rc; | |
109 | int i; | |
38833cbd | 110 | unsigned char buffer[MAXLEN] = {0}; |
eb86be54 HM |
111 | u8 decimals = 0; |
112 | ||
4d155eb5 ON |
113 | if(mydev->shadow_power != 1) |
114 | return; | |
115 | ||
eb86be54 HM |
116 | /* The device is right to left, where as you write left to right */ |
117 | for (i = 0; i < mydev->textlength; i++) | |
118 | buffer[i] = mydev->text[mydev->textlength-1-i]; | |
119 | ||
38833cbd AT |
120 | rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48, |
121 | (85 * 0x100) + 10, /* (write text) */ | |
122 | (0 * 0x100) + mydev->textmode, /* mode */ | |
123 | &buffer, mydev->textlength, 2000, mf); | |
eb86be54 HM |
124 | |
125 | if (rc < 0) | |
126 | dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc); | |
127 | ||
eb86be54 HM |
128 | /* The device is right to left, where as you write left to right */ |
129 | for (i = 0; i < sizeof(mydev->decimals); i++) | |
130 | decimals |= mydev->decimals[i] << i; | |
131 | ||
38833cbd AT |
132 | rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48, |
133 | (86 * 0x100) + 10, /* (set decimal) */ | |
134 | (0 * 0x100) + decimals, /* decimals */ | |
135 | NULL, 0, 2000, mf); | |
eb86be54 HM |
136 | |
137 | if (rc < 0) | |
138 | dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc); | |
139 | } | |
140 | ||
141 | #define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn) \ | |
a86856db | 142 | static ssize_t name##_show(struct device *dev, \ |
eb86be54 HM |
143 | struct device_attribute *attr, char *buf) \ |
144 | { \ | |
145 | struct usb_interface *intf = to_usb_interface(dev); \ | |
146 | struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \ | |
147 | \ | |
148 | return sprintf(buf, "%u\n", mydev->name); \ | |
149 | } \ | |
150 | \ | |
a86856db | 151 | static ssize_t name##_store(struct device *dev, \ |
eb86be54 HM |
152 | struct device_attribute *attr, const char *buf, size_t count) \ |
153 | { \ | |
154 | struct usb_interface *intf = to_usb_interface(dev); \ | |
155 | struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \ | |
156 | \ | |
157 | mydev->name = simple_strtoul(buf, NULL, 10); \ | |
4d155eb5 | 158 | update_fcn(mydev); \ |
eb86be54 HM |
159 | \ |
160 | return count; \ | |
161 | } \ | |
a86856db | 162 | static DEVICE_ATTR_RW(name); |
eb86be54 | 163 | |
ed5bd7a4 | 164 | static ssize_t text_show(struct device *dev, |
eb86be54 HM |
165 | struct device_attribute *attr, char *buf) |
166 | { | |
167 | struct usb_interface *intf = to_usb_interface(dev); | |
168 | struct usb_sevsegdev *mydev = usb_get_intfdata(intf); | |
169 | ||
e0c6b1f3 | 170 | return sysfs_emit(buf, "%s\n", mydev->text); |
eb86be54 HM |
171 | } |
172 | ||
ed5bd7a4 | 173 | static ssize_t text_store(struct device *dev, |
eb86be54 HM |
174 | struct device_attribute *attr, const char *buf, size_t count) |
175 | { | |
176 | struct usb_interface *intf = to_usb_interface(dev); | |
177 | struct usb_sevsegdev *mydev = usb_get_intfdata(intf); | |
178 | size_t end = my_memlen(buf, count); | |
179 | ||
180 | if (end > sizeof(mydev->text)) | |
181 | return -EINVAL; | |
182 | ||
183 | memset(mydev->text, 0, sizeof(mydev->text)); | |
184 | mydev->textlength = end; | |
185 | ||
186 | if (end > 0) | |
187 | memcpy(mydev->text, buf, end); | |
188 | ||
4d155eb5 | 189 | update_display_visual(mydev, GFP_KERNEL); |
eb86be54 HM |
190 | return count; |
191 | } | |
192 | ||
ed5bd7a4 | 193 | static DEVICE_ATTR_RW(text); |
eb86be54 | 194 | |
ed5bd7a4 | 195 | static ssize_t decimals_show(struct device *dev, |
eb86be54 HM |
196 | struct device_attribute *attr, char *buf) |
197 | { | |
198 | struct usb_interface *intf = to_usb_interface(dev); | |
199 | struct usb_sevsegdev *mydev = usb_get_intfdata(intf); | |
200 | int i; | |
201 | int pos; | |
202 | ||
203 | for (i = 0; i < sizeof(mydev->decimals); i++) { | |
204 | pos = sizeof(mydev->decimals) - 1 - i; | |
205 | if (mydev->decimals[i] == 0) | |
206 | buf[pos] = '0'; | |
207 | else if (mydev->decimals[i] == 1) | |
208 | buf[pos] = '1'; | |
209 | else | |
210 | buf[pos] = 'x'; | |
211 | } | |
212 | ||
213 | buf[sizeof(mydev->decimals)] = '\n'; | |
214 | return sizeof(mydev->decimals) + 1; | |
215 | } | |
216 | ||
ed5bd7a4 | 217 | static ssize_t decimals_store(struct device *dev, |
eb86be54 HM |
218 | struct device_attribute *attr, const char *buf, size_t count) |
219 | { | |
220 | struct usb_interface *intf = to_usb_interface(dev); | |
221 | struct usb_sevsegdev *mydev = usb_get_intfdata(intf); | |
222 | size_t end = my_memlen(buf, count); | |
223 | int i; | |
224 | ||
225 | if (end > sizeof(mydev->decimals)) | |
226 | return -EINVAL; | |
227 | ||
228 | for (i = 0; i < end; i++) | |
229 | if (buf[i] != '0' && buf[i] != '1') | |
230 | return -EINVAL; | |
231 | ||
232 | memset(mydev->decimals, 0, sizeof(mydev->decimals)); | |
233 | for (i = 0; i < end; i++) | |
234 | if (buf[i] == '1') | |
235 | mydev->decimals[end-1-i] = 1; | |
236 | ||
4d155eb5 | 237 | update_display_visual(mydev, GFP_KERNEL); |
eb86be54 HM |
238 | |
239 | return count; | |
240 | } | |
241 | ||
ed5bd7a4 | 242 | static DEVICE_ATTR_RW(decimals); |
eb86be54 | 243 | |
ed5bd7a4 | 244 | static ssize_t textmode_show(struct device *dev, |
eb86be54 HM |
245 | struct device_attribute *attr, char *buf) |
246 | { | |
247 | struct usb_interface *intf = to_usb_interface(dev); | |
248 | struct usb_sevsegdev *mydev = usb_get_intfdata(intf); | |
249 | int i; | |
250 | ||
251 | buf[0] = 0; | |
252 | ||
0bd08fc8 | 253 | for (i = 0; i < ARRAY_SIZE(display_textmodes); i++) { |
eb86be54 HM |
254 | if (mydev->textmode == i) { |
255 | strcat(buf, " ["); | |
256 | strcat(buf, display_textmodes[i]); | |
257 | strcat(buf, "] "); | |
258 | } else { | |
259 | strcat(buf, " "); | |
260 | strcat(buf, display_textmodes[i]); | |
261 | strcat(buf, " "); | |
262 | } | |
263 | } | |
264 | strcat(buf, "\n"); | |
265 | ||
266 | ||
267 | return strlen(buf); | |
268 | } | |
269 | ||
ed5bd7a4 | 270 | static ssize_t textmode_store(struct device *dev, |
eb86be54 HM |
271 | struct device_attribute *attr, const char *buf, size_t count) |
272 | { | |
273 | struct usb_interface *intf = to_usb_interface(dev); | |
274 | struct usb_sevsegdev *mydev = usb_get_intfdata(intf); | |
275 | int i; | |
276 | ||
0bd08fc8 AS |
277 | i = sysfs_match_string(display_textmodes, buf); |
278 | if (i < 0) | |
279 | return i; | |
eb86be54 | 280 | |
0bd08fc8 AS |
281 | mydev->textmode = i; |
282 | update_display_visual(mydev, GFP_KERNEL); | |
283 | return count; | |
eb86be54 HM |
284 | } |
285 | ||
ed5bd7a4 | 286 | static DEVICE_ATTR_RW(textmode); |
eb86be54 HM |
287 | |
288 | ||
289 | MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered); | |
290 | MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode); | |
291 | MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode); | |
292 | ||
a21350fe | 293 | static struct attribute *sevseg_attrs[] = { |
eb86be54 HM |
294 | &dev_attr_powered.attr, |
295 | &dev_attr_text.attr, | |
296 | &dev_attr_textmode.attr, | |
297 | &dev_attr_decimals.attr, | |
298 | &dev_attr_mode_msb.attr, | |
299 | &dev_attr_mode_lsb.attr, | |
300 | NULL | |
301 | }; | |
a21350fe | 302 | ATTRIBUTE_GROUPS(sevseg); |
eb86be54 HM |
303 | |
304 | static int sevseg_probe(struct usb_interface *interface, | |
305 | const struct usb_device_id *id) | |
306 | { | |
307 | struct usb_device *udev = interface_to_usbdev(interface); | |
308 | struct usb_sevsegdev *mydev = NULL; | |
309 | int rc = -ENOMEM; | |
310 | ||
311 | mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL); | |
bcf0848d | 312 | if (!mydev) |
eb86be54 | 313 | goto error_mem; |
eb86be54 HM |
314 | |
315 | mydev->udev = usb_get_dev(udev); | |
4d155eb5 | 316 | mydev->intf = interface; |
eb86be54 HM |
317 | usb_set_intfdata(interface, mydev); |
318 | ||
4c1f5c88 HM |
319 | /* PM */ |
320 | mydev->shadow_power = 1; /* currently active */ | |
321 | mydev->has_interface_pm = 0; /* have not issued autopm_get */ | |
322 | ||
eb86be54 HM |
323 | /*set defaults */ |
324 | mydev->textmode = 0x02; /* ascii mode */ | |
325 | mydev->mode_msb = 0x06; /* 6 characters */ | |
326 | mydev->mode_lsb = 0x3f; /* scanmode for 6 chars */ | |
327 | ||
eb86be54 HM |
328 | dev_info(&interface->dev, "USB 7 Segment device now attached\n"); |
329 | return 0; | |
330 | ||
eb86be54 HM |
331 | error_mem: |
332 | return rc; | |
333 | } | |
334 | ||
335 | static void sevseg_disconnect(struct usb_interface *interface) | |
336 | { | |
337 | struct usb_sevsegdev *mydev; | |
338 | ||
339 | mydev = usb_get_intfdata(interface); | |
eb86be54 HM |
340 | usb_set_intfdata(interface, NULL); |
341 | usb_put_dev(mydev->udev); | |
342 | kfree(mydev); | |
343 | dev_info(&interface->dev, "USB 7 Segment now disconnected\n"); | |
344 | } | |
345 | ||
4d155eb5 ON |
346 | static int sevseg_suspend(struct usb_interface *intf, pm_message_t message) |
347 | { | |
348 | struct usb_sevsegdev *mydev; | |
349 | ||
350 | mydev = usb_get_intfdata(intf); | |
351 | mydev->shadow_power = 0; | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static int sevseg_resume(struct usb_interface *intf) | |
357 | { | |
358 | struct usb_sevsegdev *mydev; | |
359 | ||
360 | mydev = usb_get_intfdata(intf); | |
361 | mydev->shadow_power = 1; | |
362 | update_display_mode(mydev); | |
363 | update_display_visual(mydev, GFP_NOIO); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static int sevseg_reset_resume(struct usb_interface *intf) | |
369 | { | |
370 | struct usb_sevsegdev *mydev; | |
371 | ||
372 | mydev = usb_get_intfdata(intf); | |
373 | mydev->shadow_power = 1; | |
374 | update_display_mode(mydev); | |
375 | update_display_visual(mydev, GFP_NOIO); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
eb86be54 HM |
380 | static struct usb_driver sevseg_driver = { |
381 | .name = "usbsevseg", | |
382 | .probe = sevseg_probe, | |
383 | .disconnect = sevseg_disconnect, | |
4d155eb5 ON |
384 | .suspend = sevseg_suspend, |
385 | .resume = sevseg_resume, | |
386 | .reset_resume = sevseg_reset_resume, | |
eb86be54 | 387 | .id_table = id_table, |
a21350fe | 388 | .dev_groups = sevseg_groups, |
4d155eb5 | 389 | .supports_autosuspend = 1, |
eb86be54 HM |
390 | }; |
391 | ||
65db4305 | 392 | module_usb_driver(sevseg_driver); |
eb86be54 HM |
393 | |
394 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
395 | MODULE_DESCRIPTION(DRIVER_DESC); | |
396 | MODULE_LICENSE("GPL"); |