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usb-gadget: use per-attribute show and store methods
[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
AP		 51 struct config_group os_desc_group;
52 struct config_group *default_groups[5];
88af8bbe
SAS		 53
54 struct mutex lock;
55 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
56 struct list_head string_list;
57 struct list_head available_func;
58
59 const char *udc_name;
88af8bbe
SAS		 60 struct usb_composite_driver composite;
61 struct usb_composite_dev cdev;
87213d38
AP		 62 bool use_os_desc;
63 char b_vendor_code;
64 char qw_sign[OS_STRING_QW_SIGN_LEN];
88af8bbe
SAS		 65};
66
45b6a73f
CH		 67static inline struct gadget_info *to_gadget_info(struct config_item *item)
68{
69 return container_of(to_config_group(item), struct gadget_info, group);
70}
71
88af8bbe
SAS		 72struct config_usb_cfg {
73 struct config_group group;
74 struct config_group strings_group;
75 struct config_group *default_groups[2];
76 struct list_head string_list;
77 struct usb_configuration c;
78 struct list_head func_list;
79 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
80};
81
45b6a73f
CH		 82static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
83{
84 return container_of(to_config_group(item), struct config_usb_cfg,
85 group);
86}
87
88af8bbe
SAS		 88struct gadget_strings {
89 struct usb_gadget_strings stringtab_dev;
90 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
91 char *manufacturer;
92 char *product;
93 char *serialnumber;
94
95 struct config_group group;
96 struct list_head list;
97};
98
87213d38
AP		 99struct os_desc {
100 struct config_group group;
101};
102
88af8bbe
SAS		 103struct gadget_config_name {
104 struct usb_gadget_strings stringtab_dev;
105 struct usb_string strings;
106 char *configuration;
107
108 struct config_group group;
109 struct list_head list;
110};
111
112static int usb_string_copy(const char *s, char **s_copy)
113{
114 int ret;
115 char *str;
116 char *copy = *s_copy;
117 ret = strlen(s);
118 if (ret > 126)
119 return -EOVERFLOW;
120
121 str = kstrdup(s, GFP_KERNEL);
122 if (!str)
123 return -ENOMEM;
124 if (str[ret - 1] == '\n')
125 str[ret - 1] = '\0';
126 kfree(copy);
127 *s_copy = str;
128 return 0;
129}
130
88af8bbe 131#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
45b6a73f 132static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
88af8bbe
SAS		 133 char *page) \
134{ \
45b6a73f
CH		 135 return sprintf(page, "0x%02x\n", \
136 to_gadget_info(item)->cdev.desc.__name); \
88af8bbe
SAS		 137}
138
139#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
45b6a73f 140static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
88af8bbe
SAS		 141 char *page) \
142{ \
45b6a73f
CH		 143 return sprintf(page, "0x%04x\n", \
144 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
88af8bbe
SAS		 145}
146
147
148#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
45b6a73f 149static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
88af8bbe
SAS		 150 const char *page, size_t len) \
151{ \
152 u8 val; \
153 int ret; \
154 ret = kstrtou8(page, 0, &val); \
155 if (ret) \
156 return ret; \
45b6a73f 157 to_gadget_info(item)->cdev.desc._name = val; \
88af8bbe
SAS		 158 return len; \
159}
160
161#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
45b6a73f 162static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
88af8bbe
SAS		 163 const char *page, size_t len) \
164{ \
165 u16 val; \
166 int ret; \
167 ret = kstrtou16(page, 0, &val); \
168 if (ret) \
169 return ret; \
45b6a73f 170 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
88af8bbe
SAS		 171 return len; \
172}
173
174#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
175 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
176 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
177
178GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
179GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
180GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
181GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
182GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
183GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
184GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
185GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
186
187static ssize_t is_valid_bcd(u16 bcd_val)
188{
189 if ((bcd_val & 0xf) > 9)
190 return -EINVAL;
191 if (((bcd_val >> 4) & 0xf) > 9)
192 return -EINVAL;
193 if (((bcd_val >> 8) & 0xf) > 9)
194 return -EINVAL;
195 if (((bcd_val >> 12) & 0xf) > 9)
196 return -EINVAL;
197 return 0;
198}
199
45b6a73f 200static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
88af8bbe
SAS		 201 const char *page, size_t len)
202{
203 u16 bcdDevice;
204 int ret;
205
206 ret = kstrtou16(page, 0, &bcdDevice);
207 if (ret)
208 return ret;
209 ret = is_valid_bcd(bcdDevice);
210 if (ret)
211 return ret;
212
45b6a73f 213 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
88af8bbe
SAS		 214 return len;
215}
216
45b6a73f 217static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
88af8bbe
SAS		 218 const char *page, size_t len)
219{
220 u16 bcdUSB;
221 int ret;
222
223 ret = kstrtou16(page, 0, &bcdUSB);
224 if (ret)
225 return ret;
226 ret = is_valid_bcd(bcdUSB);
227 if (ret)
228 return ret;
229
45b6a73f 230 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
88af8bbe
SAS		 231 return len;
232}
233
45b6a73f 234static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
88af8bbe 235{
45b6a73f 236 return sprintf(page, "%s\n", to_gadget_info(item)->udc_name ?: "");
88af8bbe
SAS		 237}
238
239static int unregister_gadget(struct gadget_info *gi)
240{
241 int ret;
242
243 if (!gi->udc_name)
244 return -ENODEV;
245
246 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
247 if (ret)
248 return ret;
249 kfree(gi->udc_name);
250 gi->udc_name = NULL;
251 return 0;
252}
253
45b6a73f 254static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
88af8bbe
SAS		 255 const char *page, size_t len)
256{
45b6a73f 257 struct gadget_info *gi = to_gadget_info(item);
88af8bbe
SAS		 258 char *name;
259 int ret;
260
261 name = kstrdup(page, GFP_KERNEL);
262 if (!name)
263 return -ENOMEM;
264 if (name[len - 1] == '\n')
265 name[len - 1] = '\0';
266
267 mutex_lock(&gi->lock);
268
269 if (!strlen(name)) {
270 ret = unregister_gadget(gi);
271 if (ret)
272 goto err;
273 } else {
274 if (gi->udc_name) {
275 ret = -EBUSY;
276 goto err;
277 }
02e8c966 278 ret = usb_udc_attach_driver(name, &gi->composite.gadget_driver);
88af8bbe
SAS		 279 if (ret)
280 goto err;
281 gi->udc_name = name;
282 }
283 mutex_unlock(&gi->lock);
284 return len;
285err:
286 kfree(name);
287 mutex_unlock(&gi->lock);
288 return ret;
289}
290
45b6a73f
CH		 291CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
292CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
293CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
294CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
295CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
296CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
297CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
298CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
299CONFIGFS_ATTR(gadget_dev_desc_, UDC);
88af8bbe
SAS		 300
301static struct configfs_attribute *gadget_root_attrs[] = {
45b6a73f
CH		 302 &gadget_dev_desc_attr_bDeviceClass,
303 &gadget_dev_desc_attr_bDeviceSubClass,
304 &gadget_dev_desc_attr_bDeviceProtocol,
305 &gadget_dev_desc_attr_bMaxPacketSize0,
306 &gadget_dev_desc_attr_idVendor,
307 &gadget_dev_desc_attr_idProduct,
308 &gadget_dev_desc_attr_bcdDevice,
309 &gadget_dev_desc_attr_bcdUSB,
310 &gadget_dev_desc_attr_UDC,
88af8bbe
SAS		 311 NULL,
312};
313
88af8bbe
SAS		 314static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
315{
316 return container_of(to_config_group(item), struct gadget_strings,
317 group);
318}
319
320static inline struct gadget_config_name *to_gadget_config_name(
321 struct config_item *item)
322{
323 return container_of(to_config_group(item), struct gadget_config_name,
324 group);
325}
326
88af8bbe
SAS		 327static inline struct usb_function_instance *to_usb_function_instance(
328 struct config_item *item)
329{
330 return container_of(to_config_group(item),
331 struct usb_function_instance, group);
332}
333
334static void gadget_info_attr_release(struct config_item *item)
335{
336 struct gadget_info *gi = to_gadget_info(item);
337
338 WARN_ON(!list_empty(&gi->cdev.configs));
339 WARN_ON(!list_empty(&gi->string_list));
340 WARN_ON(!list_empty(&gi->available_func));
341 kfree(gi->composite.gadget_driver.function);
342 kfree(gi);
343}
344
88af8bbe
SAS		 345static struct configfs_item_operations gadget_root_item_ops = {
346 .release = gadget_info_attr_release,
88af8bbe
SAS		 347};
348
349static void gadget_config_attr_release(struct config_item *item)
350{
351 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
352
353 WARN_ON(!list_empty(&cfg->c.functions));
354 list_del(&cfg->c.list);
355 kfree(cfg->c.label);
356 kfree(cfg);
357}
358
359static int config_usb_cfg_link(
360 struct config_item *usb_cfg_ci,
361 struct config_item *usb_func_ci)
362{
363 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
364 struct usb_composite_dev *cdev = cfg->c.cdev;
365 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
366
367 struct config_group *group = to_config_group(usb_func_ci);
368 struct usb_function_instance *fi = container_of(group,
369 struct usb_function_instance, group);
370 struct usb_function_instance *a_fi;
371 struct usb_function *f;
372 int ret;
373
374 mutex_lock(&gi->lock);
375 /*
376 * Make sure this function is from within our _this_ gadget and not
377 * from another gadget or a random directory.
378 * Also a function instance can only be linked once.
379 */
380 list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
381 if (a_fi == fi)
382 break;
383 }
384 if (a_fi != fi) {
385 ret = -EINVAL;
386 goto out;
387 }
388
389 list_for_each_entry(f, &cfg->func_list, list) {
390 if (f->fi == fi) {
391 ret = -EEXIST;
392 goto out;
393 }
394 }
395
396 f = usb_get_function(fi);
397 if (IS_ERR(f)) {
398 ret = PTR_ERR(f);
399 goto out;
400 }
401
402 /* stash the function until we bind it to the gadget */
403 list_add_tail(&f->list, &cfg->func_list);
404 ret = 0;
405out:
406 mutex_unlock(&gi->lock);
407 return ret;
408}
409
410static int config_usb_cfg_unlink(
411 struct config_item *usb_cfg_ci,
412 struct config_item *usb_func_ci)
413{
414 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
415 struct usb_composite_dev *cdev = cfg->c.cdev;
416 struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
417
418 struct config_group *group = to_config_group(usb_func_ci);
419 struct usb_function_instance *fi = container_of(group,
420 struct usb_function_instance, group);
421 struct usb_function *f;
422
423 /*
424 * ideally I would like to forbid to unlink functions while a gadget is
425 * bound to an UDC. Since this isn't possible at the moment, we simply
426 * force an unbind, the function is available here and then we can
427 * remove the function.
428 */
429 mutex_lock(&gi->lock);
430 if (gi->udc_name)
431 unregister_gadget(gi);
432 WARN_ON(gi->udc_name);
433
434 list_for_each_entry(f, &cfg->func_list, list) {
435 if (f->fi == fi) {
436 list_del(&f->list);
437 usb_put_function(f);
438 mutex_unlock(&gi->lock);
439 return 0;
440 }
441 }
442 mutex_unlock(&gi->lock);
75bfe23a 443 WARN(1, "Unable to locate function to unbind\n");
88af8bbe
SAS		 444 return 0;
445}
446
88af8bbe
SAS		 447static struct configfs_item_operations gadget_config_item_ops = {
448 .release = gadget_config_attr_release,
88af8bbe
SAS		 449 .allow_link = config_usb_cfg_link,
450 .drop_link = config_usb_cfg_unlink,
451};
452
453
45b6a73f 454static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
88af8bbe
SAS		 455 char *page)
456{
45b6a73f 457 return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower);
88af8bbe
SAS		 458}
459
45b6a73f 460static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
88af8bbe
SAS		 461 const char *page, size_t len)
462{
463 u16 val;
464 int ret;
465 ret = kstrtou16(page, 0, &val);
466 if (ret)
467 return ret;
468 if (DIV_ROUND_UP(val, 8) > 0xff)
469 return -ERANGE;
45b6a73f 470 to_config_usb_cfg(item)->c.MaxPower = val;
88af8bbe
SAS		 471 return len;
472}
473
45b6a73f 474static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
88af8bbe
SAS		 475 char *page)
476{
45b6a73f
CH		 477 return sprintf(page, "0x%02x\n",
478 to_config_usb_cfg(item)->c.bmAttributes);
88af8bbe
SAS		 479}
480
45b6a73f 481static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
88af8bbe
SAS		 482 const char *page, size_t len)
483{
484 u8 val;
485 int ret;
486 ret = kstrtou8(page, 0, &val);
487 if (ret)
488 return ret;
489 if (!(val & USB_CONFIG_ATT_ONE))
490 return -EINVAL;
491 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
492 USB_CONFIG_ATT_WAKEUP))
493 return -EINVAL;
45b6a73f 494 to_config_usb_cfg(item)->c.bmAttributes = val;
88af8bbe
SAS		 495 return len;
496}
497
45b6a73f
CH		 498CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
499CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
88af8bbe
SAS		 500
501static struct configfs_attribute *gadget_config_attrs[] = {
45b6a73f
CH		 502 &gadget_config_desc_attr_MaxPower,
503 &gadget_config_desc_attr_bmAttributes,
88af8bbe
SAS		 504 NULL,
505};
506
507static struct config_item_type gadget_config_type = {
508 .ct_item_ops = &gadget_config_item_ops,
509 .ct_attrs = gadget_config_attrs,
510 .ct_owner = THIS_MODULE,
511};
512
513static struct config_item_type gadget_root_type = {
514 .ct_item_ops = &gadget_root_item_ops,
515 .ct_attrs = gadget_root_attrs,
516 .ct_owner = THIS_MODULE,
517};
518
519static void composite_init_dev(struct usb_composite_dev *cdev)
520{
521 spin_lock_init(&cdev->lock);
522 INIT_LIST_HEAD(&cdev->configs);
523 INIT_LIST_HEAD(&cdev->gstrings);
524}
525
526static struct config_group *function_make(
527 struct config_group *group,
528 const char *name)
529{
530 struct gadget_info *gi;
531 struct usb_function_instance *fi;
532 char buf[MAX_NAME_LEN];
533 char *func_name;
534 char *instance_name;
535 int ret;
536
537 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
538 if (ret >= MAX_NAME_LEN)
539 return ERR_PTR(-ENAMETOOLONG);
540
541 func_name = buf;
542 instance_name = strchr(func_name, '.');
543 if (!instance_name) {
544 pr_err("Unable to locate . in FUNC.INSTANCE\n");
545 return ERR_PTR(-EINVAL);
546 }
547 *instance_name = '\0';
548 instance_name++;
549
550 fi = usb_get_function_instance(func_name);
551 if (IS_ERR(fi))
a3469411 552 return ERR_CAST(fi);
88af8bbe 553
3958b792 554 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
88af8bbe
SAS		 555 if (ret) {
556 usb_put_function_instance(fi);
557 return ERR_PTR(ret);
558 }
1933861d
AP		 559 if (fi->set_inst_name) {
560 ret = fi->set_inst_name(fi, instance_name);
561 if (ret) {
562 usb_put_function_instance(fi);
563 return ERR_PTR(ret);
564 }
565 }
88af8bbe
SAS		 566
567 gi = container_of(group, struct gadget_info, functions_group);
568
569 mutex_lock(&gi->lock);
570 list_add_tail(&fi->cfs_list, &gi->available_func);
571 mutex_unlock(&gi->lock);
572 return &fi->group;
573}
574
575static void function_drop(
576 struct config_group *group,
577 struct config_item *item)
578{
579 struct usb_function_instance *fi = to_usb_function_instance(item);
580 struct gadget_info *gi;
581
582 gi = container_of(group, struct gadget_info, functions_group);
583
584 mutex_lock(&gi->lock);
585 list_del(&fi->cfs_list);
586 mutex_unlock(&gi->lock);
587 config_item_put(item);
588}
589
590static struct configfs_group_operations functions_ops = {
591 .make_group = &function_make,
592 .drop_item = &function_drop,
593};
594
595static struct config_item_type functions_type = {
596 .ct_group_ops = &functions_ops,
597 .ct_owner = THIS_MODULE,
598};
599
88af8bbe
SAS		 600GS_STRINGS_RW(gadget_config_name, configuration);
601
602static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
45b6a73f 603 &gadget_config_name_attr_configuration,
88af8bbe
SAS		 604 NULL,
605};
606
607static void gadget_config_name_attr_release(struct config_item *item)
608{
609 struct gadget_config_name *cn = to_gadget_config_name(item);
610
611 kfree(cn->configuration);
612
613 list_del(&cn->list);
614 kfree(cn);
615}
616
617USB_CONFIG_STRING_RW_OPS(gadget_config_name);
618USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
619
620static struct config_group *config_desc_make(
621 struct config_group *group,
622 const char *name)
623{
624 struct gadget_info *gi;
625 struct config_usb_cfg *cfg;
626 char buf[MAX_NAME_LEN];
627 char *num_str;
628 u8 num;
629 int ret;
630
631 gi = container_of(group, struct gadget_info, configs_group);
632 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
633 if (ret >= MAX_NAME_LEN)
634 return ERR_PTR(-ENAMETOOLONG);
635
636 num_str = strchr(buf, '.');
637 if (!num_str) {
638 pr_err("Unable to locate . in name.bConfigurationValue\n");
639 return ERR_PTR(-EINVAL);
640 }
641
642 *num_str = '\0';
643 num_str++;
644
645 if (!strlen(buf))
646 return ERR_PTR(-EINVAL);
647
648 ret = kstrtou8(num_str, 0, &num);
649 if (ret)
650 return ERR_PTR(ret);
651
652 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
653 if (!cfg)
654 return ERR_PTR(-ENOMEM);
655 cfg->c.label = kstrdup(buf, GFP_KERNEL);
656 if (!cfg->c.label) {
657 ret = -ENOMEM;
658 goto err;
659 }
660 cfg->c.bConfigurationValue = num;
661 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
662 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
663 INIT_LIST_HEAD(&cfg->string_list);
664 INIT_LIST_HEAD(&cfg->func_list);
665
666 cfg->group.default_groups = cfg->default_groups;
667 cfg->default_groups[0] = &cfg->strings_group;
668
669 config_group_init_type_name(&cfg->group, name,
670 &gadget_config_type);
671 config_group_init_type_name(&cfg->strings_group, "strings",
672 &gadget_config_name_strings_type);
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);
876 if (gi->udc_name)
877 unregister_gadget(gi);
878 cdev->os_desc_config = NULL;
879 WARN_ON(gi->udc_name);
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{
1149 struct config_group **f_default_groups, *os_desc_group,
1150 **interface_groups;
1151 struct config_item_type *os_desc_type, *interface_type;
1152
1153 vla_group(data_chunk);
1154 vla_item(data_chunk, struct config_group *, f_default_groups, 2);
1155 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1156 vla_item(data_chunk, struct config_group *, interface_groups,
1157 n_interf + 1);
1158 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1159 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1160
1161 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1162 if (!vlabuf)
1163 return -ENOMEM;
1164
1165 f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups);
1166 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1167 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1168 interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups);
1169 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1170
1171 parent->default_groups = f_default_groups;
1172 os_desc_type->ct_owner = owner;
1173 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1174 f_default_groups[0] = os_desc_group;
1175
1176 os_desc_group->default_groups = interface_groups;
7419485f 1177 interface_type->ct_group_ops = &interf_grp_ops;
da424314
AP		 1178 interface_type->ct_attrs = interf_grp_attrs;
1179 interface_type->ct_owner = owner;
1180
1181 while (n_interf--) {
1182 struct usb_os_desc *d;
1183
1184 d = desc[n_interf];
7419485f 1185 d->owner = owner;
da424314 1186 config_group_init_type_name(&d->group, "", interface_type);
14574b54
AP		 1187 config_item_set_name(&d->group.cg_item, "interface.%s",
1188 names[n_interf]);
da424314
AP		 1189 interface_groups[n_interf] = &d->group;
1190 }
1191
1192 return 0;
1193}
1194EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1195
88af8bbe
SAS		 1196static int configfs_do_nothing(struct usb_composite_dev *cdev)
1197{
75bfe23a 1198 WARN_ON(1);
88af8bbe
SAS		 1199 return -EINVAL;
1200}
1201
1202int composite_dev_prepare(struct usb_composite_driver *composite,
1203 struct usb_composite_dev *dev);
1204
da424314
AP		 1205int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1206 struct usb_ep *ep0);
1207
88af8bbe
SAS		 1208static void purge_configs_funcs(struct gadget_info *gi)
1209{
1210 struct usb_configuration *c;
1211
1212 list_for_each_entry(c, &gi->cdev.configs, list) {
1213 struct usb_function *f, *tmp;
1214 struct config_usb_cfg *cfg;
1215
1216 cfg = container_of(c, struct config_usb_cfg, c);
1217
1218 list_for_each_entry_safe(f, tmp, &c->functions, list) {
1219
1220 list_move_tail(&f->list, &cfg->func_list);
1221 if (f->unbind) {
1222 dev_err(&gi->cdev.gadget->dev, "unbind function"
1223 " '%s'/%p\n", f->name, f);
1224 f->unbind(c, f);
1225 }
1226 }
1227 c->next_interface_id = 0;
903124fe 1228 memset(c->interface, 0, sizeof(c->interface));
88af8bbe
SAS		 1229 c->superspeed = 0;
1230 c->highspeed = 0;
1231 c->fullspeed = 0;
1232 }
1233}
1234
1235static int configfs_composite_bind(struct usb_gadget *gadget,
1236 struct usb_gadget_driver *gdriver)
1237{
1238 struct usb_composite_driver *composite = to_cdriver(gdriver);
1239 struct gadget_info *gi = container_of(composite,
1240 struct gadget_info, composite);
1241 struct usb_composite_dev *cdev = &gi->cdev;
1242 struct usb_configuration *c;
1243 struct usb_string *s;
1244 unsigned i;
1245 int ret;
1246
1247 /* the gi->lock is hold by the caller */
1248 cdev->gadget = gadget;
1249 set_gadget_data(gadget, cdev);
1250 ret = composite_dev_prepare(composite, cdev);
1251 if (ret)
1252 return ret;
1253 /* and now the gadget bind */
1254 ret = -EINVAL;
1255
1256 if (list_empty(&gi->cdev.configs)) {
4d9f872c 1257 pr_err("Need at least one configuration in %s.\n",
88af8bbe
SAS		 1258 gi->composite.name);
1259 goto err_comp_cleanup;
1260 }
1261
1262
1263 list_for_each_entry(c, &gi->cdev.configs, list) {
1264 struct config_usb_cfg *cfg;
1265
1266 cfg = container_of(c, struct config_usb_cfg, c);
1267 if (list_empty(&cfg->func_list)) {
4d9f872c 1268 pr_err("Config %s/%d of %s needs at least one function.\n",
88af8bbe
SAS		 1269 c->label, c->bConfigurationValue,
1270 gi->composite.name);
1271 goto err_comp_cleanup;
1272 }
1273 }
1274
1275 /* init all strings */
1276 if (!list_empty(&gi->string_list)) {
1277 struct gadget_strings *gs;
1278
1279 i = 0;
1280 list_for_each_entry(gs, &gi->string_list, list) {
1281
1282 gi->gstrings[i] = &gs->stringtab_dev;
1283 gs->stringtab_dev.strings = gs->strings;
1284 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1285 gs->manufacturer;
1286 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1287 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1288 i++;
1289 }
1290 gi->gstrings[i] = NULL;
1291 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1292 USB_GADGET_FIRST_AVAIL_IDX);
fea77077
WY		 1293 if (IS_ERR(s)) {
1294 ret = PTR_ERR(s);
88af8bbe 1295 goto err_comp_cleanup;
fea77077 1296 }
88af8bbe
SAS		 1297
1298 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1299 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1300 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1301 }
1302
87213d38
AP		 1303 if (gi->use_os_desc) {
1304 cdev->use_os_string = true;
1305 cdev->b_vendor_code = gi->b_vendor_code;
1306 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1307 }
1308
41ce84c8
LJ		 1309 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1310 struct usb_descriptor_header *usb_desc;
1311
1312 usb_desc = usb_otg_descriptor_alloc(gadget);
1313 if (!usb_desc) {
1314 ret = -ENOMEM;
1315 goto err_comp_cleanup;
1316 }
1317 usb_otg_descriptor_init(gadget, usb_desc);
1318 otg_desc[0] = usb_desc;
1319 otg_desc[1] = NULL;
1320 }
1321
88af8bbe
SAS		 1322 /* Go through all configs, attach all functions */
1323 list_for_each_entry(c, &gi->cdev.configs, list) {
1324 struct config_usb_cfg *cfg;
1325 struct usb_function *f;
1326 struct usb_function *tmp;
1327 struct gadget_config_name *cn;
1328
41ce84c8
LJ		 1329 if (gadget_is_otg(gadget))
1330 c->descriptors = otg_desc;
1331
88af8bbe
SAS		 1332 cfg = container_of(c, struct config_usb_cfg, c);
1333 if (!list_empty(&cfg->string_list)) {
1334 i = 0;
1335 list_for_each_entry(cn, &cfg->string_list, list) {
1336 cfg->gstrings[i] = &cn->stringtab_dev;
1337 cn->stringtab_dev.strings = &cn->strings;
1338 cn->strings.s = cn->configuration;
1339 i++;
1340 }
1341 cfg->gstrings[i] = NULL;
1342 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
fea77077
WY		 1343 if (IS_ERR(s)) {
1344 ret = PTR_ERR(s);
88af8bbe 1345 goto err_comp_cleanup;
fea77077 1346 }
88af8bbe
SAS		 1347 c->iConfiguration = s[0].id;
1348 }
1349
1350 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1351 list_del(&f->list);
1352 ret = usb_add_function(c, f);
5a68e9b5
AP		 1353 if (ret) {
1354 list_add(&f->list, &cfg->func_list);
88af8bbe 1355 goto err_purge_funcs;
5a68e9b5 1356 }
88af8bbe
SAS		 1357 }
1358 usb_ep_autoconfig_reset(cdev->gadget);
1359 }
da424314
AP		 1360 if (cdev->use_os_string) {
1361 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1362 if (ret)
1363 goto err_purge_funcs;
1364 }
1365
88af8bbe
SAS		 1366 usb_ep_autoconfig_reset(cdev->gadget);
1367 return 0;
1368
1369err_purge_funcs:
1370 purge_configs_funcs(gi);
1371err_comp_cleanup:
1372 composite_dev_cleanup(cdev);
1373 return ret;
1374}
1375
1376static void configfs_composite_unbind(struct usb_gadget *gadget)
1377{
1378 struct usb_composite_dev *cdev;
1379 struct gadget_info *gi;
1380
1381 /* the gi->lock is hold by the caller */
1382
1383 cdev = get_gadget_data(gadget);
1384 gi = container_of(cdev, struct gadget_info, cdev);
1385
41ce84c8
LJ		 1386 kfree(otg_desc[0]);
1387 otg_desc[0] = NULL;
88af8bbe
SAS		 1388 purge_configs_funcs(gi);
1389 composite_dev_cleanup(cdev);
1390 usb_ep_autoconfig_reset(cdev->gadget);
1391 cdev->gadget = NULL;
1392 set_gadget_data(gadget, NULL);
1393}
1394
1395static const struct usb_gadget_driver configfs_driver_template = {
1396 .bind = configfs_composite_bind,
1397 .unbind = configfs_composite_unbind,
1398
1399 .setup = composite_setup,
02f751b4 1400 .reset = composite_disconnect,
88af8bbe
SAS		 1401 .disconnect = composite_disconnect,
1402
3a571870
AP		 1403 .suspend = composite_suspend,
1404 .resume = composite_resume,
1405
88af8bbe
SAS		 1406 .max_speed = USB_SPEED_SUPER,
1407 .driver = {
1408 .owner = THIS_MODULE,
1409 .name = "configfs-gadget",
1410 },
1411};
1412
1413static struct config_group *gadgets_make(
1414 struct config_group *group,
1415 const char *name)
1416{
1417 struct gadget_info *gi;
1418
1419 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1420 if (!gi)
1421 return ERR_PTR(-ENOMEM);
1422
1423 gi->group.default_groups = gi->default_groups;
1424 gi->group.default_groups[0] = &gi->functions_group;
1425 gi->group.default_groups[1] = &gi->configs_group;
1426 gi->group.default_groups[2] = &gi->strings_group;
87213d38 1427 gi->group.default_groups[3] = &gi->os_desc_group;
88af8bbe
SAS		 1428
1429 config_group_init_type_name(&gi->functions_group, "functions",
1430 &functions_type);
1431 config_group_init_type_name(&gi->configs_group, "configs",
1432 &config_desc_type);
1433 config_group_init_type_name(&gi->strings_group, "strings",
1434 &gadget_strings_strings_type);
87213d38
AP		 1435 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1436 &os_desc_type);
88af8bbe
SAS		 1437
1438 gi->composite.bind = configfs_do_nothing;
1439 gi->composite.unbind = configfs_do_nothing;
1440 gi->composite.suspend = NULL;
1441 gi->composite.resume = NULL;
1442 gi->composite.max_speed = USB_SPEED_SUPER;
1443
1444 mutex_init(&gi->lock);
1445 INIT_LIST_HEAD(&gi->string_list);
1446 INIT_LIST_HEAD(&gi->available_func);
1447
1448 composite_init_dev(&gi->cdev);
1449 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1450 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1451 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1452
1453 gi->composite.gadget_driver = configfs_driver_template;
1454
1455 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1456 gi->composite.name = gi->composite.gadget_driver.function;
1457
1458 if (!gi->composite.gadget_driver.function)
1459 goto err;
1460
88af8bbe
SAS		 1461 config_group_init_type_name(&gi->group, name,
1462 &gadget_root_type);
1463 return &gi->group;
1464err:
1465 kfree(gi);
1466 return ERR_PTR(-ENOMEM);
1467}
1468
1469static void gadgets_drop(struct config_group *group, struct config_item *item)
1470{
1471 config_item_put(item);
1472}
1473
1474static struct configfs_group_operations gadgets_ops = {
1475 .make_group = &gadgets_make,
1476 .drop_item = &gadgets_drop,
1477};
1478
1479static struct config_item_type gadgets_type = {
1480 .ct_group_ops = &gadgets_ops,
1481 .ct_owner = THIS_MODULE,
1482};
1483
1484static struct configfs_subsystem gadget_subsys = {
1485 .su_group = {
1486 .cg_item = {
1487 .ci_namebuf = "usb_gadget",
1488 .ci_type = &gadgets_type,
1489 },
1490 },
1491 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1492};
1493
092a4bd0
AP		 1494void unregister_gadget_item(struct config_item *item)
1495{
1496 struct gadget_info *gi = to_gadget_info(item);
1497
1498 unregister_gadget(gi);
1499}
0700faaf 1500EXPORT_SYMBOL_GPL(unregister_gadget_item);
092a4bd0 1501
88af8bbe
SAS		 1502static int __init gadget_cfs_init(void)
1503{
1504 int ret;
1505
1506 config_group_init(&gadget_subsys.su_group);
1507
1508 ret = configfs_register_subsystem(&gadget_subsys);
1509 return ret;
1510}
1511module_init(gadget_cfs_init);
1512
1513static void __exit gadget_cfs_exit(void)
1514{
1515 configfs_unregister_subsystem(&gadget_subsys);
1516}
1517module_exit(gadget_cfs_exit);
Linux 6.x block layer and io_uring tree(s)