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Merge tag 'drm-vc4-fixes-2016-09-14' of https://github.com/anholt/linux into drm...
[linux-2.6-block.git] / drivers / usb / gadget / configfs.c
CommitLineData
88af8bbe
SAS		 1#include <linux/configfs.h>
2#include <linux/module.h>
3#include <linux/slab.h>
4#include <linux/device.h>
87213d38 5#include <linux/nls.h>
88af8bbe
SAS		 6#include <linux/usb/composite.h>
7#include <linux/usb/gadget_configfs.h>
0009e99a 8#include "configfs.h"
da424314 9#include "u_f.h"
7419485f 10#include "u_os_desc.h"
88af8bbe
SAS		 11
12int check_user_usb_string(const char *name,
13 struct usb_gadget_strings *stringtab_dev)
14{
15 unsigned primary_lang;
16 unsigned sub_lang;
17 u16 num;
18 int ret;
19
20 ret = kstrtou16(name, 0, &num);
21 if (ret)
22 return ret;
23
24 primary_lang = num & 0x3ff;
25 sub_lang = num >> 10;
26
27 /* simple sanity check for valid langid */
28 switch (primary_lang) {
29 case 0:
30 case 0x62 ... 0xfe:
31 case 0x100 ... 0x3ff:
32 return -EINVAL;
33 }
34 if (!sub_lang)
35 return -EINVAL;
36
37 stringtab_dev->language = num;
38 return 0;
39}
40
41#define MAX_NAME_LEN 40
42#define MAX_USB_STRING_LANGS 2
43
41ce84c8
LJ		 44static const struct usb_descriptor_header *otg_desc[2];
45
88af8bbe
SAS		 46struct gadget_info {
47 struct config_group group;
48 struct config_group functions_group;
49 struct config_group configs_group;
50 struct config_group strings_group;
87213d38 51 struct config_group os_desc_group;
88af8bbe
SAS		 52
53 struct mutex lock;
54 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
55 struct list_head string_list;
56 struct list_head available_func;
57
88af8bbe
SAS		 58 struct usb_composite_driver composite;
59 struct usb_composite_dev cdev;
87213d38
AP		 60 bool use_os_desc;
61 char b_vendor_code;
62 char qw_sign[OS_STRING_QW_SIGN_LEN];
88af8bbe
SAS		 63};
64
45b6a73f
CH		 65static inline struct gadget_info *to_gadget_info(struct config_item *item)
66{
67 return container_of(to_config_group(item), struct gadget_info, group);
68}
69
88af8bbe
SAS		 70struct config_usb_cfg {
71 struct config_group group;
72 struct config_group strings_group;
88af8bbe
SAS		 73 struct list_head string_list;
74 struct usb_configuration c;
75 struct list_head func_list;
76 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
77};
78
45b6a73f
CH		 79static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
80{
81 return container_of(to_config_group(item), struct config_usb_cfg,
82 group);
83}
84
88af8bbe
SAS		 85struct gadget_strings {
86 struct usb_gadget_strings stringtab_dev;
87 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
88 char *manufacturer;
89 char *product;
90 char *serialnumber;
91
92 struct config_group group;
93 struct list_head list;
94};
95
87213d38
AP		 96struct os_desc {
97 struct config_group group;
98};
99
88af8bbe
SAS		 100struct gadget_config_name {
101 struct usb_gadget_strings stringtab_dev;
102 struct usb_string strings;
103 char *configuration;
104
105 struct config_group group;
106 struct list_head list;
107};
108
109static int usb_string_copy(const char *s, char **s_copy)
110{
111 int ret;
112 char *str;
113 char *copy = *s_copy;
114 ret = strlen(s);
115 if (ret > 126)
116 return -EOVERFLOW;
117
118 str = kstrdup(s, GFP_KERNEL);
119 if (!str)
120 return -ENOMEM;
121 if (str[ret - 1] == '\n')
122 str[ret - 1] = '\0';
123 kfree(copy);
124 *s_copy = str;
125 return 0;
126}
127
88af8bbe 128#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
45b6a73f 129static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
88af8bbe
SAS		 130 char *page) \
131{ \
45b6a73f
CH		 132 return sprintf(page, "0x%02x\n", \
133 to_gadget_info(item)->cdev.desc.__name); \
88af8bbe
SAS		 134}
135
136#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
45b6a73f 137static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
88af8bbe
SAS		 138 char *page) \
139{ \
45b6a73f
CH		 140 return sprintf(page, "0x%04x\n", \
141 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
88af8bbe
SAS		 142}
143
144
145#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
45b6a73f 146static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
88af8bbe
SAS		 147 const char *page, size_t len) \
148{ \
149 u8 val; \
150 int ret; \
151 ret = kstrtou8(page, 0, &val); \
152 if (ret) \
153 return ret; \
45b6a73f 154 to_gadget_info(item)->cdev.desc._name = val; \
88af8bbe
SAS		 155 return len; \
156}
157
158#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
45b6a73f 159static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
88af8bbe
SAS		 160 const char *page, size_t len) \
161{ \
162 u16 val; \
163 int ret; \
164 ret = kstrtou16(page, 0, &val); \
165 if (ret) \
166 return ret; \
45b6a73f 167 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
88af8bbe
SAS		 168 return len; \
169}
170
171#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
172 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
173 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
174
175GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
176GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
177GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
178GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
179GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
180GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
181GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
182GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
183
184static ssize_t is_valid_bcd(u16 bcd_val)
185{
186 if ((bcd_val & 0xf) > 9)
187 return -EINVAL;
188 if (((bcd_val >> 4) & 0xf) > 9)
189 return -EINVAL;
190 if (((bcd_val >> 8) & 0xf) > 9)
191 return -EINVAL;
192 if (((bcd_val >> 12) & 0xf) > 9)
193 return -EINVAL;
194 return 0;
195}
196
45b6a73f 197static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
88af8bbe
SAS		 198 const char *page, size_t len)
199{
200 u16 bcdDevice;
201 int ret;
202
203 ret = kstrtou16(page, 0, &bcdDevice);
204 if (ret)
205 return ret;
206 ret = is_valid_bcd(bcdDevice);
207 if (ret)
208 return ret;
209
45b6a73f 210 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
88af8bbe
SAS		 211 return len;
212}
213
45b6a73f 214static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
88af8bbe
SAS		 215 const char *page, size_t len)
216{
217 u16 bcdUSB;
218 int ret;
219
220 ret = kstrtou16(page, 0, &bcdUSB);
221 if (ret)
222 return ret;
223 ret = is_valid_bcd(bcdUSB);
224 if (ret)
225 return ret;
226
45b6a73f 227 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
88af8bbe
SAS		 228 return len;
229}
230
45b6a73f 231static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
88af8bbe 232{
afdaadc3
RB		 233 char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name;
234
235 return sprintf(page, "%s\n", udc_name ?: "");
88af8bbe
SAS		 236}
237
238static int unregister_gadget(struct gadget_info *gi)
239{
240 int ret;
241
afdaadc3 242 if (!gi->composite.gadget_driver.udc_name)
88af8bbe
SAS		 243 return -ENODEV;
244
245 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
246 if (ret)
247 return ret;
afdaadc3
RB		 248 kfree(gi->composite.gadget_driver.udc_name);
249 gi->composite.gadget_driver.udc_name = NULL;
88af8bbe
SAS		 250 return 0;
251}
252
45b6a73f 253static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
88af8bbe
SAS		 254 const char *page, size_t len)
255{
45b6a73f 256 struct gadget_info *gi = to_gadget_info(item);
88af8bbe
SAS		 257 char *name;
258 int ret;
259
260 name = kstrdup(page, GFP_KERNEL);
261 if (!name)
262 return -ENOMEM;
263 if (name[len - 1] == '\n')
264 name[len - 1] = '\0';
265
266 mutex_lock(&gi->lock);
267
268 if (!strlen(name)) {
269 ret = unregister_gadget(gi);
270 if (ret)
271 goto err;
272 } else {
afdaadc3 273 if (gi->composite.gadget_driver.udc_name) {
88af8bbe
SAS		 274 ret = -EBUSY;
275 goto err;
276 }
afdaadc3
RB		 277 gi->composite.gadget_driver.udc_name = name;
278 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
279 if (ret) {
280 gi->composite.gadget_driver.udc_name = NULL;
88af8bbe 281 goto err;
afdaadc3 282 }
88af8bbe
SAS		 283 }
284 mutex_unlock(&gi->lock);
285 return len;
286err:
287 kfree(name);
288 mutex_unlock(&gi->lock);
289 return ret;
290}
291
45b6a73f
CH		 292CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
293CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
294CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
295CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
296CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
297CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
298CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
299CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
300CONFIGFS_ATTR(gadget_dev_desc_, UDC);
88af8bbe
SAS		 301
302static struct configfs_attribute *gadget_root_attrs[] = {
45b6a73f
CH		 303 &gadget_dev_desc_attr_bDeviceClass,
304 &gadget_dev_desc_attr_bDeviceSubClass,
305 &gadget_dev_desc_attr_bDeviceProtocol,
306 &gadget_dev_desc_attr_bMaxPacketSize0,
307 &gadget_dev_desc_attr_idVendor,
308 &gadget_dev_desc_attr_idProduct,
309 &gadget_dev_desc_attr_bcdDevice,
310 &gadget_dev_desc_attr_bcdUSB,
311 &gadget_dev_desc_attr_UDC,
88af8bbe
SAS		 312 NULL,
313};
314
88af8bbe
SAS		 315static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
316{
317 return container_of(to_config_group(item), struct gadget_strings,
318 group);
319}
320
321static inline struct gadget_config_name *to_gadget_config_name(
322 struct config_item *item)
323{
324 return container_of(to_config_group(item), struct gadget_config_name,
325 group);
326}
327
88af8bbe
SAS		 328static inline struct usb_function_instance *to_usb_function_instance(
329 struct config_item *item)
330{
331 return container_of(to_config_group(item),
332 struct usb_function_instance, group);
333}
334
335static void gadget_info_attr_release(struct config_item *item)
336{
337 struct gadget_info *gi = to_gadget_info(item);
338
339 WARN_ON(!list_empty(&gi->cdev.configs));
340 WARN_ON(!list_empty(&gi->string_list));
341 WARN_ON(!list_empty(&gi->available_func));
342 kfree(gi->composite.gadget_driver.function);
343 kfree(gi);
344}
345
88af8bbe
SAS		 346static struct configfs_item_operations gadget_root_item_ops = {
347 .release = gadget_info_attr_release,
88af8bbe
SAS		 348};
349
350static void gadget_config_attr_release(struct config_item *item)
351{
352 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
353
354 WARN_ON(!list_empty(&cfg->c.functions));
355 list_del(&cfg->c.list);
356 kfree(cfg->c.label);
357 kfree(cfg);
358}
359
360static int config_usb_cfg_link(
361 struct config_item *usb_cfg_ci,
362 struct config_item *usb_func_ci)
363{
364 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
365 struct usb_composite_dev *cdev = cfg->c.cdev;
366 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
367
368 struct config_group *group = to_config_group(usb_func_ci);
369 struct usb_function_instance *fi = container_of(group,
370 struct usb_function_instance, group);
371 struct usb_function_instance *a_fi;
372 struct usb_function *f;
373 int ret;
374
375 mutex_lock(&gi->lock);
376 /*
377 * Make sure this function is from within our _this_ gadget and not
378 * from another gadget or a random directory.
379 * Also a function instance can only be linked once.
380 */
381 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
382 if (a_fi == fi)
383 break;
384 }
385 if (a_fi != fi) {
386 ret = -EINVAL;
387 goto out;
388 }
389
390 list_for_each_entry(f, &cfg->func_list, list) {
391 if (f->fi == fi) {
392 ret = -EEXIST;
393 goto out;
394 }
395 }
396
397 f = usb_get_function(fi);
398 if (IS_ERR(f)) {
399 ret = PTR_ERR(f);
400 goto out;
401 }
402
403 /* stash the function until we bind it to the gadget */
404 list_add_tail(&f->list, &cfg->func_list);
405 ret = 0;
406out:
407 mutex_unlock(&gi->lock);
408 return ret;
409}
410
411static int config_usb_cfg_unlink(
412 struct config_item *usb_cfg_ci,
413 struct config_item *usb_func_ci)
414{
415 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
416 struct usb_composite_dev *cdev = cfg->c.cdev;
417 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
418
419 struct config_group *group = to_config_group(usb_func_ci);
420 struct usb_function_instance *fi = container_of(group,
421 struct usb_function_instance, group);
422 struct usb_function *f;
423
424 /*
425 * ideally I would like to forbid to unlink functions while a gadget is
426 * bound to an UDC. Since this isn't possible at the moment, we simply
427 * force an unbind, the function is available here and then we can
428 * remove the function.
429 */
430 mutex_lock(&gi->lock);
afdaadc3 431 if (gi->composite.gadget_driver.udc_name)
88af8bbe 432 unregister_gadget(gi);
afdaadc3 433 WARN_ON(gi->composite.gadget_driver.udc_name);
88af8bbe
SAS		 434
435 list_for_each_entry(f, &cfg->func_list, list) {
436 if (f->fi == fi) {
437 list_del(&f->list);
438 usb_put_function(f);
439 mutex_unlock(&gi->lock);
440 return 0;
441 }
442 }
443 mutex_unlock(&gi->lock);
75bfe23a 444 WARN(1, "Unable to locate function to unbind\n");
88af8bbe
SAS		 445 return 0;
446}
447
88af8bbe
SAS		 448static struct configfs_item_operations gadget_config_item_ops = {
449 .release = gadget_config_attr_release,
88af8bbe
SAS		 450 .allow_link = config_usb_cfg_link,
451 .drop_link = config_usb_cfg_unlink,
452};
453
454
45b6a73f 455static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
88af8bbe
SAS		 456 char *page)
457{
45b6a73f 458 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
88af8bbe
SAS		 459}
460
45b6a73f 461static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
88af8bbe
SAS		 462 const char *page, size_t len)
463{
464 u16 val;
465 int ret;
466 ret = kstrtou16(page, 0, &val);
467 if (ret)
468 return ret;
469 if (DIV_ROUND_UP(val, 8) > 0xff)
470 return -ERANGE;
45b6a73f 471 to_config_usb_cfg(item)->c.MaxPower = val;
88af8bbe
SAS		 472 return len;
473}
474
45b6a73f 475static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
88af8bbe
SAS		 476 char *page)
477{
45b6a73f
CH		 478 return sprintf(page, "0x%02x\n",
479 to_config_usb_cfg(item)->c.bmAttributes);
88af8bbe
SAS		 480}
481
45b6a73f 482static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
88af8bbe
SAS		 483 const char *page, size_t len)
484{
485 u8 val;
486 int ret;
487 ret = kstrtou8(page, 0, &val);
488 if (ret)
489 return ret;
490 if (!(val & USB_CONFIG_ATT_ONE))
491 return -EINVAL;
492 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
493 USB_CONFIG_ATT_WAKEUP))
494 return -EINVAL;
45b6a73f 495 to_config_usb_cfg(item)->c.bmAttributes = val;
88af8bbe
SAS		 496 return len;
497}
498
45b6a73f
CH		 499CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
500CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
88af8bbe
SAS		 501
502static struct configfs_attribute *gadget_config_attrs[] = {
45b6a73f
CH		 503 &gadget_config_desc_attr_MaxPower,
504 &gadget_config_desc_attr_bmAttributes,
88af8bbe
SAS		 505 NULL,
506};
507
508static struct config_item_type gadget_config_type = {
509 .ct_item_ops = &gadget_config_item_ops,
510 .ct_attrs = gadget_config_attrs,
511 .ct_owner = THIS_MODULE,
512};
513
514static struct config_item_type gadget_root_type = {
515 .ct_item_ops = &gadget_root_item_ops,
516 .ct_attrs = gadget_root_attrs,
517 .ct_owner = THIS_MODULE,
518};
519
520static void composite_init_dev(struct usb_composite_dev *cdev)
521{
522 spin_lock_init(&cdev->lock);
523 INIT_LIST_HEAD(&cdev->configs);
524 INIT_LIST_HEAD(&cdev->gstrings);
525}
526
527static struct config_group *function_make(
528 struct config_group *group,
529 const char *name)
530{
531 struct gadget_info *gi;
532 struct usb_function_instance *fi;
533 char buf[MAX_NAME_LEN];
534 char *func_name;
535 char *instance_name;
536 int ret;
537
538 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
539 if (ret >= MAX_NAME_LEN)
540 return ERR_PTR(-ENAMETOOLONG);
541
542 func_name = buf;
543 instance_name = strchr(func_name, '.');
544 if (!instance_name) {
545 pr_err("Unable to locate . in FUNC.INSTANCE\n");
546 return ERR_PTR(-EINVAL);
547 }
548 *instance_name = '\0';
549 instance_name++;
550
551 fi = usb_get_function_instance(func_name);
552 if (IS_ERR(fi))
a3469411 553 return ERR_CAST(fi);
88af8bbe 554
3958b792 555 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
88af8bbe
SAS		 556 if (ret) {
557 usb_put_function_instance(fi);
558 return ERR_PTR(ret);
559 }
1933861d
AP		 560 if (fi->set_inst_name) {
561 ret = fi->set_inst_name(fi, instance_name);
562 if (ret) {
563 usb_put_function_instance(fi);
564 return ERR_PTR(ret);
565 }
566 }
88af8bbe
SAS		 567
568 gi = container_of(group, struct gadget_info, functions_group);
569
570 mutex_lock(&gi->lock);
571 list_add_tail(&fi->cfs_list, &gi->available_func);
572 mutex_unlock(&gi->lock);
573 return &fi->group;
574}
575
576static void function_drop(
577 struct config_group *group,
578 struct config_item *item)
579{
580 struct usb_function_instance *fi = to_usb_function_instance(item);
581 struct gadget_info *gi;
582
583 gi = container_of(group, struct gadget_info, functions_group);
584
585 mutex_lock(&gi->lock);
586 list_del(&fi->cfs_list);
587 mutex_unlock(&gi->lock);
588 config_item_put(item);
589}
590
591static struct configfs_group_operations functions_ops = {
592 .make_group = &function_make,
593 .drop_item = &function_drop,
594};
595
596static struct config_item_type functions_type = {
597 .ct_group_ops = &functions_ops,
598 .ct_owner = THIS_MODULE,
599};
600
88af8bbe
SAS		 601GS_STRINGS_RW(gadget_config_name, configuration);
602
603static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
45b6a73f 604 &gadget_config_name_attr_configuration,
88af8bbe
SAS		 605 NULL,
606};
607
608static void gadget_config_name_attr_release(struct config_item *item)
609{
610 struct gadget_config_name *cn = to_gadget_config_name(item);
611
612 kfree(cn->configuration);
613
614 list_del(&cn->list);
615 kfree(cn);
616}
617
618USB_CONFIG_STRING_RW_OPS(gadget_config_name);
619USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
620
621static struct config_group *config_desc_make(
622 struct config_group *group,
623 const char *name)
624{
625 struct gadget_info *gi;
626 struct config_usb_cfg *cfg;
627 char buf[MAX_NAME_LEN];
628 char *num_str;
629 u8 num;
630 int ret;
631
632 gi = container_of(group, struct gadget_info, configs_group);
633 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
634 if (ret >= MAX_NAME_LEN)
635 return ERR_PTR(-ENAMETOOLONG);
636
637 num_str = strchr(buf, '.');
638 if (!num_str) {
639 pr_err("Unable to locate . in name.bConfigurationValue\n");
640 return ERR_PTR(-EINVAL);
641 }
642
643 *num_str = '\0';
644 num_str++;
645
646 if (!strlen(buf))
647 return ERR_PTR(-EINVAL);
648
649 ret = kstrtou8(num_str, 0, &num);
650 if (ret)
651 return ERR_PTR(ret);
652
653 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
654 if (!cfg)
655 return ERR_PTR(-ENOMEM);
656 cfg->c.label = kstrdup(buf, GFP_KERNEL);
657 if (!cfg->c.label) {
658 ret = -ENOMEM;
659 goto err;
660 }
661 cfg->c.bConfigurationValue = num;
662 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
663 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
664 INIT_LIST_HEAD(&cfg->string_list);
665 INIT_LIST_HEAD(&cfg->func_list);
666
88af8bbe
SAS		 667 config_group_init_type_name(&cfg->group, name,
668 &gadget_config_type);
1ae1602d 669
88af8bbe
SAS		 670 config_group_init_type_name(&cfg->strings_group, "strings",
671 &gadget_config_name_strings_type);
1ae1602d 672 configfs_add_default_group(&cfg->strings_group, &cfg->group);
88af8bbe
SAS		 673
674 ret = usb_add_config_only(&gi->cdev, &cfg->c);
675 if (ret)
676 goto err;
677
678 return &cfg->group;
679err:
680 kfree(cfg->c.label);
681 kfree(cfg);
682 return ERR_PTR(ret);
683}
684
685static void config_desc_drop(
686 struct config_group *group,
687 struct config_item *item)
688{
689 config_item_put(item);
690}
691
692static struct configfs_group_operations config_desc_ops = {
693 .make_group = &config_desc_make,
694 .drop_item = &config_desc_drop,
695};
696
697static struct config_item_type config_desc_type = {
698 .ct_group_ops = &config_desc_ops,
699 .ct_owner = THIS_MODULE,
700};
701
88af8bbe
SAS		 702GS_STRINGS_RW(gadget_strings, manufacturer);
703GS_STRINGS_RW(gadget_strings, product);
704GS_STRINGS_RW(gadget_strings, serialnumber);
705
706static struct configfs_attribute *gadget_strings_langid_attrs[] = {
45b6a73f
CH		 707 &gadget_strings_attr_manufacturer,
708 &gadget_strings_attr_product,
709 &gadget_strings_attr_serialnumber,
88af8bbe
SAS		 710 NULL,
711};
712
713static void gadget_strings_attr_release(struct config_item *item)
714{
715 struct gadget_strings *gs = to_gadget_strings(item);
716
717 kfree(gs->manufacturer);
718 kfree(gs->product);
719 kfree(gs->serialnumber);
720
721 list_del(&gs->list);
722 kfree(gs);
723}
724
725USB_CONFIG_STRING_RW_OPS(gadget_strings);
726USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
727
87213d38
AP		 728static inline struct os_desc *to_os_desc(struct config_item *item)
729{
730 return container_of(to_config_group(item), struct os_desc, group);
731}
732
45b6a73f
CH		 733static inline struct gadget_info *os_desc_item_to_gadget_info(
734 struct config_item *item)
87213d38 735{
45b6a73f
CH		 736 return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
737}
87213d38 738
45b6a73f
CH		 739static ssize_t os_desc_use_show(struct config_item *item, char *page)
740{
741 return sprintf(page, "%d",
742 os_desc_item_to_gadget_info(item)->use_os_desc);
87213d38
AP		 743}
744
45b6a73f 745static ssize_t os_desc_use_store(struct config_item *item, const char *page,
87213d38
AP		 746 size_t len)
747{
45b6a73f 748 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
87213d38
AP		 749 int ret;
750 bool use;
751
87213d38
AP		 752 mutex_lock(&gi->lock);
753 ret = strtobool(page, &use);
754 if (!ret) {
755 gi->use_os_desc = use;
756 ret = len;
757 }
758 mutex_unlock(&gi->lock);
759
760 return ret;
761}
762
45b6a73f 763static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
87213d38 764{
45b6a73f
CH		 765 return sprintf(page, "%d",
766 os_desc_item_to_gadget_info(item)->b_vendor_code);
87213d38
AP		 767}
768
45b6a73f 769static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
87213d38
AP		 770 const char *page, size_t len)
771{
45b6a73f 772 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
87213d38
AP		 773 int ret;
774 u8 b_vendor_code;
775
87213d38
AP		 776 mutex_lock(&gi->lock);
777 ret = kstrtou8(page, 0, &b_vendor_code);
778 if (!ret) {
779 gi->b_vendor_code = b_vendor_code;
780 ret = len;
781 }
782 mutex_unlock(&gi->lock);
783
784 return ret;
785}
786
45b6a73f 787static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
87213d38 788{
45b6a73f 789 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
87213d38
AP		 790
791 memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
87213d38
AP		 792 return OS_STRING_QW_SIGN_LEN;
793}
794
45b6a73f 795static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
87213d38
AP		 796 size_t len)
797{
45b6a73f 798 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
87213d38
AP		 799 int res, l;
800
87213d38
AP		 801 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
802 if (page[l - 1] == '\n')
803 --l;
804
805 mutex_lock(&gi->lock);
806 res = utf8s_to_utf16s(page, l,
807 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
808 OS_STRING_QW_SIGN_LEN);
809 if (res > 0)
810 res = len;
811 mutex_unlock(&gi->lock);
812
813 return res;
814}
815
45b6a73f
CH		 816CONFIGFS_ATTR(os_desc_, use);
817CONFIGFS_ATTR(os_desc_, b_vendor_code);
818CONFIGFS_ATTR(os_desc_, qw_sign);
87213d38
AP		 819
820static struct configfs_attribute *os_desc_attrs[] = {
45b6a73f
CH		 821 &os_desc_attr_use,
822 &os_desc_attr_b_vendor_code,
823 &os_desc_attr_qw_sign,
87213d38
AP		 824 NULL,
825};
826
827static void os_desc_attr_release(struct config_item *item)
828{
829 struct os_desc *os_desc = to_os_desc(item);
830 kfree(os_desc);
831}
832
da424314
AP		 833static int os_desc_link(struct config_item *os_desc_ci,
834 struct config_item *usb_cfg_ci)
835{
836 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
837 struct gadget_info, os_desc_group);
838 struct usb_composite_dev *cdev = &gi->cdev;
839 struct config_usb_cfg *c_target =
840 container_of(to_config_group(usb_cfg_ci),
841 struct config_usb_cfg, group);
842 struct usb_configuration *c;
843 int ret;
844
845 mutex_lock(&gi->lock);
846 list_for_each_entry(c, &cdev->configs, list) {
847 if (c == &c_target->c)
848 break;
849 }
850 if (c != &c_target->c) {
851 ret = -EINVAL;
852 goto out;
853 }
854
855 if (cdev->os_desc_config) {
856 ret = -EBUSY;
857 goto out;
858 }
859
860 cdev->os_desc_config = &c_target->c;
861 ret = 0;
862
863out:
864 mutex_unlock(&gi->lock);
865 return ret;
866}
867
868static int os_desc_unlink(struct config_item *os_desc_ci,
869 struct config_item *usb_cfg_ci)
870{
871 struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
872 struct gadget_info, os_desc_group);
873 struct usb_composite_dev *cdev = &gi->cdev;
874
875 mutex_lock(&gi->lock);
afdaadc3 876 if (gi->composite.gadget_driver.udc_name)
da424314
AP		 877 unregister_gadget(gi);
878 cdev->os_desc_config = NULL;
afdaadc3 879 WARN_ON(gi->composite.gadget_driver.udc_name);
da424314
AP		 880 mutex_unlock(&gi->lock);
881 return 0;
882}
883
87213d38
AP		 884static struct configfs_item_operations os_desc_ops = {
885 .release = os_desc_attr_release,
da424314
AP		 886 .allow_link = os_desc_link,
887 .drop_link = os_desc_unlink,
87213d38
AP		 888};
889
890static struct config_item_type os_desc_type = {
891 .ct_item_ops = &os_desc_ops,
892 .ct_attrs = os_desc_attrs,
893 .ct_owner = THIS_MODULE,
894};
895
7419485f
AP		 896static inline struct usb_os_desc_ext_prop
897*to_usb_os_desc_ext_prop(struct config_item *item)
898{
899 return container_of(item, struct usb_os_desc_ext_prop, item);
900}
901
45b6a73f 902static ssize_t ext_prop_type_show(struct config_item *item, char *page)
7419485f 903{
45b6a73f 904 return sprintf(page, "%d", to_usb_os_desc_ext_prop(item)->type);
7419485f
AP		 905}
906
45b6a73f 907static ssize_t ext_prop_type_store(struct config_item *item,
7419485f
AP		 908 const char *page, size_t len)
909{
45b6a73f 910 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
7419485f
AP		 911 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
912 u8 type;
913 int ret;
914
915 if (desc->opts_mutex)
916 mutex_lock(desc->opts_mutex);
917 ret = kstrtou8(page, 0, &type);
918 if (ret)
919 goto end;
920 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
921 ret = -EINVAL;
922 goto end;
923 }
924
925 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
926 ext_prop->type == USB_EXT_PROP_LE32 ||
927 ext_prop->type == USB_EXT_PROP_BE32) &&
928 (type == USB_EXT_PROP_UNICODE ||
929 type == USB_EXT_PROP_UNICODE_ENV ||
930 type == USB_EXT_PROP_UNICODE_LINK))
931 ext_prop->data_len <<= 1;
932 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
933 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
934 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
935 (type == USB_EXT_PROP_BINARY ||
936 type == USB_EXT_PROP_LE32 ||
937 type == USB_EXT_PROP_BE32))
938 ext_prop->data_len >>= 1;
939 ext_prop->type = type;
940 ret = len;
941
942end:
943 if (desc->opts_mutex)
944 mutex_unlock(desc->opts_mutex);
945 return ret;
946}
947
45b6a73f 948static ssize_t ext_prop_data_show(struct config_item *item, char *page)
7419485f 949{
45b6a73f 950 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
7419485f
AP		 951 int len = ext_prop->data_len;
952
953 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
954 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
955 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
956 len >>= 1;
957 memcpy(page, ext_prop->data, len);
958
959 return len;
960}
961
45b6a73f 962static ssize_t ext_prop_data_store(struct config_item *item,
7419485f
AP		 963 const char *page, size_t len)
964{
45b6a73f 965 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
7419485f
AP		 966 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
967 char *new_data;
968 size_t ret_len = len;
969
970 if (page[len - 1] == '\n' || page[len - 1] == '\0')
971 --len;
58b949e0 972 new_data = kmemdup(page, len, GFP_KERNEL);
7419485f
AP		 973 if (!new_data)
974 return -ENOMEM;
975
7419485f
AP		 976 if (desc->opts_mutex)
977 mutex_lock(desc->opts_mutex);
978 kfree(ext_prop->data);
979 ext_prop->data = new_data;
980 desc->ext_prop_len -= ext_prop->data_len;
981 ext_prop->data_len = len;
982 desc->ext_prop_len += ext_prop->data_len;
983 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
984 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
985 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
986 desc->ext_prop_len -= ext_prop->data_len;
987 ext_prop->data_len <<= 1;
988 ext_prop->data_len += 2;
989 desc->ext_prop_len += ext_prop->data_len;
990 }
991 if (desc->opts_mutex)
992 mutex_unlock(desc->opts_mutex);
993 return ret_len;
994}
995
45b6a73f
CH		 996CONFIGFS_ATTR(ext_prop_, type);
997CONFIGFS_ATTR(ext_prop_, data);
7419485f
AP		 998
999static struct configfs_attribute *ext_prop_attrs[] = {
45b6a73f
CH		 1000 &ext_prop_attr_type,
1001 &ext_prop_attr_data,
7419485f
AP		 1002 NULL,
1003};
1004
1005static void usb_os_desc_ext_prop_release(struct config_item *item)
1006{
1007 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1008
1009 kfree(ext_prop); /* frees a whole chunk */
1010}
1011
1012static struct configfs_item_operations ext_prop_ops = {
1013 .release = usb_os_desc_ext_prop_release,
7419485f
AP		 1014};
1015
1016static struct config_item *ext_prop_make(
1017 struct config_group *group,
1018 const char *name)
1019{
1020 struct usb_os_desc_ext_prop *ext_prop;
1021 struct config_item_type *ext_prop_type;
1022 struct usb_os_desc *desc;
1023 char *vlabuf;
1024
1025 vla_group(data_chunk);
1026 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1027 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1028
1029 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1030 if (!vlabuf)
1031 return ERR_PTR(-ENOMEM);
1032
1033 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1034 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1035
1036 desc = container_of(group, struct usb_os_desc, group);
1037 ext_prop_type->ct_item_ops = &ext_prop_ops;
1038 ext_prop_type->ct_attrs = ext_prop_attrs;
1039 ext_prop_type->ct_owner = desc->owner;
1040
1041 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1042
1043 ext_prop->name = kstrdup(name, GFP_KERNEL);
1044 if (!ext_prop->name) {
1045 kfree(vlabuf);
1046 return ERR_PTR(-ENOMEM);
1047 }
1048 desc->ext_prop_len += 14;
1049 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1050 if (desc->opts_mutex)
1051 mutex_lock(desc->opts_mutex);
1052 desc->ext_prop_len += ext_prop->name_len;
1053 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1054 ++desc->ext_prop_count;
1055 if (desc->opts_mutex)
1056 mutex_unlock(desc->opts_mutex);
1057
1058 return &ext_prop->item;
1059}
1060
1061static void ext_prop_drop(struct config_group *group, struct config_item *item)
1062{
1063 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1064 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1065
1066 if (desc->opts_mutex)
1067 mutex_lock(desc->opts_mutex);
1068 list_del(&ext_prop->entry);
1069 --desc->ext_prop_count;
1070 kfree(ext_prop->name);
1071 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1072 if (desc->opts_mutex)
1073 mutex_unlock(desc->opts_mutex);
1074 config_item_put(item);
1075}
1076
1077static struct configfs_group_operations interf_grp_ops = {
1078 .make_item = &ext_prop_make,
1079 .drop_item = &ext_prop_drop,
1080};
1081
45b6a73f 1082static ssize_t interf_grp_compatible_id_show(struct config_item *item,
fe00b138 1083 char *page)
da424314 1084{
45b6a73f 1085 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
da424314
AP		 1086 return 8;
1087}
1088
45b6a73f 1089static ssize_t interf_grp_compatible_id_store(struct config_item *item,
fe00b138 1090 const char *page, size_t len)
da424314 1091{
45b6a73f 1092 struct usb_os_desc *desc = to_usb_os_desc(item);
da424314
AP		 1093 int l;
1094
1095 l = min_t(int, 8, len);
1096 if (page[l - 1] == '\n')
1097 --l;
1098 if (desc->opts_mutex)
1099 mutex_lock(desc->opts_mutex);
1100 memcpy(desc->ext_compat_id, page, l);
da424314
AP		 1101
1102 if (desc->opts_mutex)
1103 mutex_unlock(desc->opts_mutex);
1104
1105 return len;
1106}
1107
45b6a73f 1108static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
fe00b138 1109 char *page)
da424314 1110{
45b6a73f 1111 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
da424314
AP		 1112 return 8;
1113}
1114
45b6a73f 1115static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
fe00b138 1116 const char *page, size_t len)
da424314 1117{
45b6a73f 1118 struct usb_os_desc *desc = to_usb_os_desc(item);
da424314
AP		 1119 int l;
1120
1121 l = min_t(int, 8, len);
1122 if (page[l - 1] == '\n')
1123 --l;
1124 if (desc->opts_mutex)
1125 mutex_lock(desc->opts_mutex);
1126 memcpy(desc->ext_compat_id + 8, page, l);
da424314
AP		 1127
1128 if (desc->opts_mutex)
1129 mutex_unlock(desc->opts_mutex);
1130
1131 return len;
1132}
1133
45b6a73f
CH		 1134CONFIGFS_ATTR(interf_grp_, compatible_id);
1135CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
da424314
AP		 1136
1137static struct configfs_attribute *interf_grp_attrs[] = {
45b6a73f
CH		 1138 &interf_grp_attr_compatible_id,
1139 &interf_grp_attr_sub_compatible_id,
da424314
AP		 1140 NULL
1141};
1142
1143int usb_os_desc_prepare_interf_dir(struct config_group *parent,
1144 int n_interf,
1145 struct usb_os_desc **desc,
14574b54 1146 char **names,
da424314
AP		 1147 struct module *owner)
1148{
1ae1602d 1149 struct config_group *os_desc_group;
da424314
AP		 1150 struct config_item_type *os_desc_type, *interface_type;
1151
1152 vla_group(data_chunk);
da424314 1153 vla_item(data_chunk, struct config_group, os_desc_group, 1);
da424314
AP		 1154 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1155 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1156
1157 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1158 if (!vlabuf)
1159 return -ENOMEM;
1160
da424314
AP		 1161 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1162 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
da424314
AP		 1163 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1164
da424314
AP		 1165 os_desc_type->ct_owner = owner;
1166 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1ae1602d 1167 configfs_add_default_group(os_desc_group, parent);
da424314 1168
7419485f 1169 interface_type->ct_group_ops = &interf_grp_ops;
da424314
AP		 1170 interface_type->ct_attrs = interf_grp_attrs;
1171 interface_type->ct_owner = owner;
1172
1173 while (n_interf--) {
1174 struct usb_os_desc *d;
1175
1176 d = desc[n_interf];
7419485f 1177 d->owner = owner;
da424314 1178 config_group_init_type_name(&d->group, "", interface_type);
14574b54
AP		 1179 config_item_set_name(&d->group.cg_item, "interface.%s",
1180 names[n_interf]);
1ae1602d 1181 configfs_add_default_group(&d->group, os_desc_group);
da424314
AP		 1182 }
1183
1184 return 0;
1185}
1186EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1187
88af8bbe
SAS		 1188static int configfs_do_nothing(struct usb_composite_dev *cdev)
1189{
75bfe23a 1190 WARN_ON(1);
88af8bbe
SAS		 1191 return -EINVAL;
1192}
1193
1194int composite_dev_prepare(struct usb_composite_driver *composite,
1195 struct usb_composite_dev *dev);
1196
da424314
AP		 1197int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1198 struct usb_ep *ep0);
1199
88af8bbe
SAS		 1200static void purge_configs_funcs(struct gadget_info *gi)
1201{
1202 struct usb_configuration *c;
1203
1204 list_for_each_entry(c, &gi->cdev.configs, list) {
1205 struct usb_function *f, *tmp;
1206 struct config_usb_cfg *cfg;
1207
1208 cfg = container_of(c, struct config_usb_cfg, c);
1209
1210 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1211
1212 list_move_tail(&f->list, &cfg->func_list);
1213 if (f->unbind) {
1214 dev_err(&gi->cdev.gadget->dev, "unbind function"
1215 " '%s'/%p\n", f->name, f);
1216 f->unbind(c, f);
1217 }
1218 }
1219 c->next_interface_id = 0;
903124fe 1220 memset(c->interface, 0, sizeof(c->interface));
554eead5 1221 c->superspeed_plus = 0;
88af8bbe
SAS		 1222 c->superspeed = 0;
1223 c->highspeed = 0;
1224 c->fullspeed = 0;
1225 }
1226}
1227
1228static int configfs_composite_bind(struct usb_gadget *gadget,
1229 struct usb_gadget_driver *gdriver)
1230{
1231 struct usb_composite_driver *composite = to_cdriver(gdriver);
1232 struct gadget_info *gi = container_of(composite,
1233 struct gadget_info, composite);
1234 struct usb_composite_dev *cdev = &gi->cdev;
1235 struct usb_configuration *c;
1236 struct usb_string *s;
1237 unsigned i;
1238 int ret;
1239
1240 /* the gi->lock is hold by the caller */
1241 cdev->gadget = gadget;
1242 set_gadget_data(gadget, cdev);
1243 ret = composite_dev_prepare(composite, cdev);
1244 if (ret)
1245 return ret;
1246 /* and now the gadget bind */
1247 ret = -EINVAL;
1248
1249 if (list_empty(&gi->cdev.configs)) {
4d9f872c 1250 pr_err("Need at least one configuration in %s.\n",
88af8bbe
SAS		 1251 gi->composite.name);
1252 goto err_comp_cleanup;
1253 }
1254
1255
1256 list_for_each_entry(c, &gi->cdev.configs, list) {
1257 struct config_usb_cfg *cfg;
1258
1259 cfg = container_of(c, struct config_usb_cfg, c);
1260 if (list_empty(&cfg->func_list)) {
4d9f872c 1261 pr_err("Config %s/%d of %s needs at least one function.\n",
88af8bbe
SAS		 1262 c->label, c->bConfigurationValue,
1263 gi->composite.name);
1264 goto err_comp_cleanup;
1265 }
1266 }
1267
1268 /* init all strings */
1269 if (!list_empty(&gi->string_list)) {
1270 struct gadget_strings *gs;
1271
1272 i = 0;
1273 list_for_each_entry(gs, &gi->string_list, list) {
1274
1275 gi->gstrings[i] = &gs->stringtab_dev;
1276 gs->stringtab_dev.strings = gs->strings;
1277 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1278 gs->manufacturer;
1279 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1280 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1281 i++;
1282 }
1283 gi->gstrings[i] = NULL;
1284 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1285 USB_GADGET_FIRST_AVAIL_IDX);
fea77077
WY		 1286 if (IS_ERR(s)) {
1287 ret = PTR_ERR(s);
88af8bbe 1288 goto err_comp_cleanup;
fea77077 1289 }
88af8bbe
SAS		 1290
1291 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1292 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1293 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1294 }
1295
87213d38
AP		 1296 if (gi->use_os_desc) {
1297 cdev->use_os_string = true;
1298 cdev->b_vendor_code = gi->b_vendor_code;
1299 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1300 }
1301
41ce84c8
LJ		 1302 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1303 struct usb_descriptor_header *usb_desc;
1304
1305 usb_desc = usb_otg_descriptor_alloc(gadget);
1306 if (!usb_desc) {
1307 ret = -ENOMEM;
1308 goto err_comp_cleanup;
1309 }
1310 usb_otg_descriptor_init(gadget, usb_desc);
1311 otg_desc[0] = usb_desc;
1312 otg_desc[1] = NULL;
1313 }
1314
88af8bbe
SAS		 1315 /* Go through all configs, attach all functions */
1316 list_for_each_entry(c, &gi->cdev.configs, list) {
1317 struct config_usb_cfg *cfg;
1318 struct usb_function *f;
1319 struct usb_function *tmp;
1320 struct gadget_config_name *cn;
1321
41ce84c8
LJ		 1322 if (gadget_is_otg(gadget))
1323 c->descriptors = otg_desc;
1324
88af8bbe
SAS		 1325 cfg = container_of(c, struct config_usb_cfg, c);
1326 if (!list_empty(&cfg->string_list)) {
1327 i = 0;
1328 list_for_each_entry(cn, &cfg->string_list, list) {
1329 cfg->gstrings[i] = &cn->stringtab_dev;
1330 cn->stringtab_dev.strings = &cn->strings;
1331 cn->strings.s = cn->configuration;
1332 i++;
1333 }
1334 cfg->gstrings[i] = NULL;
1335 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
fea77077
WY		 1336 if (IS_ERR(s)) {
1337 ret = PTR_ERR(s);
88af8bbe 1338 goto err_comp_cleanup;
fea77077 1339 }
88af8bbe
SAS		 1340 c->iConfiguration = s[0].id;
1341 }
1342
1343 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1344 list_del(&f->list);
1345 ret = usb_add_function(c, f);
5a68e9b5
AP		 1346 if (ret) {
1347 list_add(&f->list, &cfg->func_list);
88af8bbe 1348 goto err_purge_funcs;
5a68e9b5 1349 }
88af8bbe
SAS		 1350 }
1351 usb_ep_autoconfig_reset(cdev->gadget);
1352 }
da424314
AP		 1353 if (cdev->use_os_string) {
1354 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1355 if (ret)
1356 goto err_purge_funcs;
1357 }
1358
88af8bbe
SAS		 1359 usb_ep_autoconfig_reset(cdev->gadget);
1360 return 0;
1361
1362err_purge_funcs:
1363 purge_configs_funcs(gi);
1364err_comp_cleanup:
1365 composite_dev_cleanup(cdev);
1366 return ret;
1367}
1368
1369static void configfs_composite_unbind(struct usb_gadget *gadget)
1370{
1371 struct usb_composite_dev *cdev;
1372 struct gadget_info *gi;
1373
1374 /* the gi->lock is hold by the caller */
1375
1376 cdev = get_gadget_data(gadget);
1377 gi = container_of(cdev, struct gadget_info, cdev);
1378
41ce84c8
LJ		 1379 kfree(otg_desc[0]);
1380 otg_desc[0] = NULL;
88af8bbe
SAS		 1381 purge_configs_funcs(gi);
1382 composite_dev_cleanup(cdev);
1383 usb_ep_autoconfig_reset(cdev->gadget);
1384 cdev->gadget = NULL;
1385 set_gadget_data(gadget, NULL);
1386}
1387
1388static const struct usb_gadget_driver configfs_driver_template = {
1389 .bind = configfs_composite_bind,
1390 .unbind = configfs_composite_unbind,
1391
1392 .setup = composite_setup,
02f751b4 1393 .reset = composite_disconnect,
88af8bbe
SAS		 1394 .disconnect = composite_disconnect,
1395
3a571870
AP		 1396 .suspend = composite_suspend,
1397 .resume = composite_resume,
1398
88af8bbe
SAS		 1399 .max_speed = USB_SPEED_SUPER,
1400 .driver = {
1401 .owner = THIS_MODULE,
1402 .name = "configfs-gadget",
1403 },
f1bddbb3 1404 .match_existing_only = 1,
88af8bbe
SAS		 1405};
1406
1407static struct config_group *gadgets_make(
1408 struct config_group *group,
1409 const char *name)
1410{
1411 struct gadget_info *gi;
1412
1413 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1414 if (!gi)
1415 return ERR_PTR(-ENOMEM);
1416
1ae1602d 1417 config_group_init_type_name(&gi->group, name, &gadget_root_type);
88af8bbe
SAS		 1418
1419 config_group_init_type_name(&gi->functions_group, "functions",
1420 &functions_type);
1ae1602d
CH		 1421 configfs_add_default_group(&gi->functions_group, &gi->group);
1422
88af8bbe
SAS		 1423 config_group_init_type_name(&gi->configs_group, "configs",
1424 &config_desc_type);
1ae1602d
CH		 1425 configfs_add_default_group(&gi->configs_group, &gi->group);
1426
88af8bbe
SAS		 1427 config_group_init_type_name(&gi->strings_group, "strings",
1428 &gadget_strings_strings_type);
1ae1602d
CH		 1429 configfs_add_default_group(&gi->strings_group, &gi->group);
1430
87213d38
AP		 1431 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1432 &os_desc_type);
1ae1602d 1433 configfs_add_default_group(&gi->os_desc_group, &gi->group);
88af8bbe
SAS		 1434
1435 gi->composite.bind = configfs_do_nothing;
1436 gi->composite.unbind = configfs_do_nothing;
1437 gi->composite.suspend = NULL;
1438 gi->composite.resume = NULL;
1439 gi->composite.max_speed = USB_SPEED_SUPER;
1440
1441 mutex_init(&gi->lock);
1442 INIT_LIST_HEAD(&gi->string_list);
1443 INIT_LIST_HEAD(&gi->available_func);
1444
1445 composite_init_dev(&gi->cdev);
1446 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1447 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1448 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1449
1450 gi->composite.gadget_driver = configfs_driver_template;
1451
1452 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1453 gi->composite.name = gi->composite.gadget_driver.function;
1454
1455 if (!gi->composite.gadget_driver.function)
1456 goto err;
1457
88af8bbe
SAS		 1458 return &gi->group;
1459err:
1460 kfree(gi);
1461 return ERR_PTR(-ENOMEM);
1462}
1463
1464static void gadgets_drop(struct config_group *group, struct config_item *item)
1465{
1466 config_item_put(item);
1467}
1468
1469static struct configfs_group_operations gadgets_ops = {
1470 .make_group = &gadgets_make,
1471 .drop_item = &gadgets_drop,
1472};
1473
1474static struct config_item_type gadgets_type = {
1475 .ct_group_ops = &gadgets_ops,
1476 .ct_owner = THIS_MODULE,
1477};
1478
1479static struct configfs_subsystem gadget_subsys = {
1480 .su_group = {
1481 .cg_item = {
1482 .ci_namebuf = "usb_gadget",
1483 .ci_type = &gadgets_type,
1484 },
1485 },
1486 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1487};
1488
092a4bd0
AP		 1489void unregister_gadget_item(struct config_item *item)
1490{
1491 struct gadget_info *gi = to_gadget_info(item);
1492
cee51c33 1493 mutex_lock(&gi->lock);
092a4bd0 1494 unregister_gadget(gi);
cee51c33 1495 mutex_unlock(&gi->lock);
092a4bd0 1496}
0700faaf 1497EXPORT_SYMBOL_GPL(unregister_gadget_item);
092a4bd0 1498
88af8bbe
SAS		 1499static int __init gadget_cfs_init(void)
1500{
1501 int ret;
1502
1503 config_group_init(&gadget_subsys.su_group);
1504
1505 ret = configfs_register_subsystem(&gadget_subsys);
1506 return ret;
1507}
1508module_init(gadget_cfs_init);
1509
1510static void __exit gadget_cfs_exit(void)
1511{
1512 configfs_unregister_subsystem(&gadget_subsys);
1513}
1514module_exit(gadget_cfs_exit);
Linux 6.x block layer and io_uring tree(s)