summaryrefslogtreecommitdiff
path: root/drivers/usb/misc/usbsevseg.c
blob: 12f7e94695a22cf638d99dba2c8ef6a88a478254 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
// SPDX-License-Identifier: GPL-2.0
/*
 * USB 7 Segment Driver
 *
 * Copyright (C) 2008 Harrison Metzger <harrisonmetz@gmail.com>
 * Based on usbled.c by Greg Kroah-Hartman (greg@kroah.com)
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/usb.h>


#define DRIVER_AUTHOR "Harrison Metzger <harrisonmetz@gmail.com>"
#define DRIVER_DESC "USB 7 Segment Driver"

#define VENDOR_ID	0x0fc5
#define PRODUCT_ID	0x1227
#define MAXLEN		8

/* table of devices that work with this driver */
static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
	{ },
};
MODULE_DEVICE_TABLE(usb, id_table);

/* the different text display modes the device is capable of */
static const char *display_textmodes[] = {"raw", "hex", "ascii"};

struct usb_sevsegdev {
	struct usb_device *udev;
	struct usb_interface *intf;

	u8 powered;
	u8 mode_msb;
	u8 mode_lsb;
	u8 decimals[MAXLEN];
	u8 textmode;
	u8 text[MAXLEN];
	u16 textlength;

	u8 shadow_power; /* for PM */
	u8 has_interface_pm;
};

/* sysfs_streq can't replace this completely
 * If the device was in hex mode, and the user wanted a 0,
 * if str commands are used, we would assume the end of string
 * so mem commands are used.
 */
static inline size_t my_memlen(const char *buf, size_t count)
{
	if (count > 0 && buf[count-1] == '\n')
		return count - 1;
	else
		return count;
}

static void update_display_powered(struct usb_sevsegdev *mydev)
{
	int rc;

	if (mydev->powered && !mydev->has_interface_pm) {
		rc = usb_autopm_get_interface(mydev->intf);
		if (rc < 0)
			return;
		mydev->has_interface_pm = 1;
	}

	if (mydev->shadow_power != 1)
		return;

	rc = usb_control_msg(mydev->udev,
			usb_sndctrlpipe(mydev->udev, 0),
			0x12,
			0x48,
			(80 * 0x100) + 10, /*  (power mode) */
			(0x00 * 0x100) + (mydev->powered ? 1 : 0),
			NULL,
			0,
			2000);
	if (rc < 0)
		dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);

	if (!mydev->powered && mydev->has_interface_pm) {
		usb_autopm_put_interface(mydev->intf);
		mydev->has_interface_pm = 0;
	}
}

static void update_display_mode(struct usb_sevsegdev *mydev)
{
	int rc;

	if(mydev->shadow_power != 1)
		return;

	rc = usb_control_msg(mydev->udev,
			usb_sndctrlpipe(mydev->udev, 0),
			0x12,
			0x48,
			(82 * 0x100) + 10, /* (set mode) */
			(mydev->mode_msb * 0x100) + mydev->mode_lsb,
			NULL,
			0,
			2000);

	if (rc < 0)
		dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
}

static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
{
	int rc;
	int i;
	unsigned char *buffer;
	u8 decimals = 0;

	if(mydev->shadow_power != 1)
		return;

	buffer = kzalloc(MAXLEN, mf);
	if (!buffer)
		return;

	/* The device is right to left, where as you write left to right */
	for (i = 0; i < mydev->textlength; i++)
		buffer[i] = mydev->text[mydev->textlength-1-i];

	rc = usb_control_msg(mydev->udev,
			usb_sndctrlpipe(mydev->udev, 0),
			0x12,
			0x48,
			(85 * 0x100) + 10, /* (write text) */
			(0 * 0x100) + mydev->textmode, /* mode  */
			buffer,
			mydev->textlength,
			2000);

	if (rc < 0)
		dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);

	kfree(buffer);

	/* The device is right to left, where as you write left to right */
	for (i = 0; i < sizeof(mydev->decimals); i++)
		decimals |= mydev->decimals[i] << i;

	rc = usb_control_msg(mydev->udev,
			usb_sndctrlpipe(mydev->udev, 0),
			0x12,
			0x48,
			(86 * 0x100) + 10, /* (set decimal) */
			(0 * 0x100) + decimals, /* decimals */
			NULL,
			0,
			2000);

	if (rc < 0)
		dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
}

#define MYDEV_ATTR_SIMPLE_UNSIGNED(name, update_fcn)		\
static ssize_t show_attr_##name(struct device *dev, 		\
	struct device_attribute *attr, char *buf) 		\
{								\
	struct usb_interface *intf = to_usb_interface(dev);	\
	struct usb_sevsegdev *mydev = usb_get_intfdata(intf);	\
								\
	return sprintf(buf, "%u\n", mydev->name);		\
}								\
								\
static ssize_t set_attr_##name(struct device *dev, 		\
	struct device_attribute *attr, const char *buf, size_t count) \
{								\
	struct usb_interface *intf = to_usb_interface(dev);	\
	struct usb_sevsegdev *mydev = usb_get_intfdata(intf);	\
								\
	mydev->name = simple_strtoul(buf, NULL, 10);		\
	update_fcn(mydev); 					\
								\
	return count;						\
}								\
static DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show_attr_##name, set_attr_##name);

static ssize_t show_attr_text(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usb_sevsegdev *mydev = usb_get_intfdata(intf);

	return snprintf(buf, mydev->textlength, "%s\n", mydev->text);
}

static ssize_t set_attr_text(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
	size_t end = my_memlen(buf, count);

	if (end > sizeof(mydev->text))
		return -EINVAL;

	memset(mydev->text, 0, sizeof(mydev->text));
	mydev->textlength = end;

	if (end > 0)
		memcpy(mydev->text, buf, end);

	update_display_visual(mydev, GFP_KERNEL);
	return count;
}

static DEVICE_ATTR(text, S_IRUGO | S_IWUSR, show_attr_text, set_attr_text);

static ssize_t show_attr_decimals(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
	int i;
	int pos;

	for (i = 0; i < sizeof(mydev->decimals); i++) {
		pos = sizeof(mydev->decimals) - 1 - i;
		if (mydev->decimals[i] == 0)
			buf[pos] = '0';
		else if (mydev->decimals[i] == 1)
			buf[pos] = '1';
		else
			buf[pos] = 'x';
	}

	buf[sizeof(mydev->decimals)] = '\n';
	return sizeof(mydev->decimals) + 1;
}

static ssize_t set_attr_decimals(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
	size_t end = my_memlen(buf, count);
	int i;

	if (end > sizeof(mydev->decimals))
		return -EINVAL;

	for (i = 0; i < end; i++)
		if (buf[i] != '0' && buf[i] != '1')
			return -EINVAL;

	memset(mydev->decimals, 0, sizeof(mydev->decimals));
	for (i = 0; i < end; i++)
		if (buf[i] == '1')
			mydev->decimals[end-1-i] = 1;

	update_display_visual(mydev, GFP_KERNEL);

	return count;
}

static DEVICE_ATTR(decimals, S_IRUGO | S_IWUSR, show_attr_decimals, set_attr_decimals);

static ssize_t show_attr_textmode(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
	int i;

	buf[0] = 0;

	for (i = 0; i < ARRAY_SIZE(display_textmodes); i++) {
		if (mydev->textmode == i) {
			strcat(buf, " [");
			strcat(buf, display_textmodes[i]);
			strcat(buf, "] ");
		} else {
			strcat(buf, " ");
			strcat(buf, display_textmodes[i]);
			strcat(buf, " ");
		}
	}
	strcat(buf, "\n");


	return strlen(buf);
}

static ssize_t set_attr_textmode(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usb_sevsegdev *mydev = usb_get_intfdata(intf);
	int i;

	i = sysfs_match_string(display_textmodes, buf);
	if (i < 0)
		return i;

	mydev->textmode = i;
	update_display_visual(mydev, GFP_KERNEL);
	return count;
}

static DEVICE_ATTR(textmode, S_IRUGO | S_IWUSR, show_attr_textmode, set_attr_textmode);


MYDEV_ATTR_SIMPLE_UNSIGNED(powered, update_display_powered);
MYDEV_ATTR_SIMPLE_UNSIGNED(mode_msb, update_display_mode);
MYDEV_ATTR_SIMPLE_UNSIGNED(mode_lsb, update_display_mode);

static struct attribute *dev_attrs[] = {
	&dev_attr_powered.attr,
	&dev_attr_text.attr,
	&dev_attr_textmode.attr,
	&dev_attr_decimals.attr,
	&dev_attr_mode_msb.attr,
	&dev_attr_mode_lsb.attr,
	NULL
};

static const struct attribute_group dev_attr_grp = {
	.attrs = dev_attrs,
};

static int sevseg_probe(struct usb_interface *interface,
	const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(interface);
	struct usb_sevsegdev *mydev = NULL;
	int rc = -ENOMEM;

	mydev = kzalloc(sizeof(struct usb_sevsegdev), GFP_KERNEL);
	if (!mydev)
		goto error_mem;

	mydev->udev = usb_get_dev(udev);
	mydev->intf = interface;
	usb_set_intfdata(interface, mydev);

	/* PM */
	mydev->shadow_power = 1; /* currently active */
	mydev->has_interface_pm = 0; /* have not issued autopm_get */

	/*set defaults */
	mydev->textmode = 0x02; /* ascii mode */
	mydev->mode_msb = 0x06; /* 6 characters */
	mydev->mode_lsb = 0x3f; /* scanmode for 6 chars */

	rc = sysfs_create_group(&interface->dev.kobj, &dev_attr_grp);
	if (rc)
		goto error;

	dev_info(&interface->dev, "USB 7 Segment device now attached\n");
	return 0;

error:
	usb_set_intfdata(interface, NULL);
	usb_put_dev(mydev->udev);
	kfree(mydev);
error_mem:
	return rc;
}

static void sevseg_disconnect(struct usb_interface *interface)
{
	struct usb_sevsegdev *mydev;

	mydev = usb_get_intfdata(interface);
	sysfs_remove_group(&interface->dev.kobj, &dev_attr_grp);
	usb_set_intfdata(interface, NULL);
	usb_put_dev(mydev->udev);
	kfree(mydev);
	dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
}

static int sevseg_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct usb_sevsegdev *mydev;

	mydev = usb_get_intfdata(intf);
	mydev->shadow_power = 0;

	return 0;
}

static int sevseg_resume(struct usb_interface *intf)
{
	struct usb_sevsegdev *mydev;

	mydev = usb_get_intfdata(intf);
	mydev->shadow_power = 1;
	update_display_mode(mydev);
	update_display_visual(mydev, GFP_NOIO);

	return 0;
}

static int sevseg_reset_resume(struct usb_interface *intf)
{
	struct usb_sevsegdev *mydev;

	mydev = usb_get_intfdata(intf);
	mydev->shadow_power = 1;
	update_display_mode(mydev);
	update_display_visual(mydev, GFP_NOIO);

	return 0;
}

static struct usb_driver sevseg_driver = {
	.name =		"usbsevseg",
	.probe =	sevseg_probe,
	.disconnect =	sevseg_disconnect,
	.suspend =	sevseg_suspend,
	.resume =	sevseg_resume,
	.reset_resume =	sevseg_reset_resume,
	.id_table =	id_table,
	.supports_autosuspend = 1,
};

module_usb_driver(sevseg_driver);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");