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usb: misc: eud: Fix an error handling path in eud_probe()
[linux-2.6-block.git] / drivers / usb / gadget / configfs.c
CommitLineData
5fd54ace 1// SPDX-License-Identifier: GPL-2.0
88af8bbe
SAS		 2#include <linux/configfs.h>
3#include <linux/module.h>
4#include <linux/slab.h>
5#include <linux/device.h>
87213d38 6#include <linux/nls.h>
88af8bbe
SAS		 7#include <linux/usb/composite.h>
8#include <linux/usb/gadget_configfs.h>
0009e99a 9#include "configfs.h"
da424314 10#include "u_f.h"
7419485f 11#include "u_os_desc.h"
88af8bbe
SAS		 12
13int check_user_usb_string(const char *name,
14 struct usb_gadget_strings *stringtab_dev)
15{
88af8bbe
SAS		 16 u16 num;
17 int ret;
18
19 ret = kstrtou16(name, 0, &num);
20 if (ret)
21 return ret;
22
17309a6a 23 if (!usb_validate_langid(num))
88af8bbe
SAS		 24 return -EINVAL;
25
26 stringtab_dev->language = num;
27 return 0;
28}
29
30#define MAX_NAME_LEN 40
31#define MAX_USB_STRING_LANGS 2
32
41ce84c8
LJ		 33static const struct usb_descriptor_header *otg_desc[2];
34
88af8bbe
SAS		 35struct gadget_info {
36 struct config_group group;
37 struct config_group functions_group;
38 struct config_group configs_group;
39 struct config_group strings_group;
87213d38 40 struct config_group os_desc_group;
88af8bbe
SAS		 41
42 struct mutex lock;
43 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
44 struct list_head string_list;
45 struct list_head available_func;
46
88af8bbe
SAS		 47 struct usb_composite_driver composite;
48 struct usb_composite_dev cdev;
87213d38
AP		 49 bool use_os_desc;
50 char b_vendor_code;
51 char qw_sign[OS_STRING_QW_SIGN_LEN];
1a1c851b
PC		 52 spinlock_t spinlock;
53 bool unbind;
88af8bbe
SAS		 54};
55
45b6a73f
CH		 56static inline struct gadget_info *to_gadget_info(struct config_item *item)
57{
9311a531 58 return container_of(to_config_group(item), struct gadget_info, group);
45b6a73f
CH		 59}
60
88af8bbe
SAS		 61struct config_usb_cfg {
62 struct config_group group;
63 struct config_group strings_group;
88af8bbe
SAS		 64 struct list_head string_list;
65 struct usb_configuration c;
66 struct list_head func_list;
67 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
68};
69
45b6a73f
CH		 70static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
71{
72 return container_of(to_config_group(item), struct config_usb_cfg,
73 group);
74}
75
260d88b7
LY		 76static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
77{
78 return container_of(cfg->c.cdev, struct gadget_info, cdev);
79}
80
88af8bbe
SAS		 81struct gadget_strings {
82 struct usb_gadget_strings stringtab_dev;
83 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
84 char *manufacturer;
85 char *product;
86 char *serialnumber;
87
88 struct config_group group;
89 struct list_head list;
90};
91
92struct gadget_config_name {
93 struct usb_gadget_strings stringtab_dev;
94 struct usb_string strings;
95 char *configuration;
96
97 struct config_group group;
98 struct list_head list;
99};
100
98f153a1
JL		 101#define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1)
102
88af8bbe
SAS		 103static int usb_string_copy(const char *s, char **s_copy)
104{
105 int ret;
106 char *str;
107 char *copy = *s_copy;
108 ret = strlen(s);
81c74628 109 if (ret > USB_MAX_STRING_LEN)
88af8bbe
SAS		 110 return -EOVERFLOW;
111
98f153a1
JL		 112 if (copy) {
113 str = copy;
114 } else {
115 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
116 if (!str)
117 return -ENOMEM;
118 }
119 strcpy(str, s);
88af8bbe
SAS		 120 if (str[ret - 1] == '\n')
121 str[ret - 1] = '\0';
88af8bbe
SAS		 122 *s_copy = str;
123 return 0;
124}
125
88af8bbe 126#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
45b6a73f 127static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
88af8bbe
SAS		 128 char *page) \
129{ \
45b6a73f
CH		 130 return sprintf(page, "0x%02x\n", \
131 to_gadget_info(item)->cdev.desc.__name); \
88af8bbe
SAS		 132}
133
134#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
45b6a73f 135static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
88af8bbe
SAS		 136 char *page) \
137{ \
45b6a73f
CH		 138 return sprintf(page, "0x%04x\n", \
139 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
88af8bbe
SAS		 140}
141
142
143#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
45b6a73f 144static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
88af8bbe
SAS		 145 const char *page, size_t len) \
146{ \
147 u8 val; \
148 int ret; \
149 ret = kstrtou8(page, 0, &val); \
150 if (ret) \
151 return ret; \
45b6a73f 152 to_gadget_info(item)->cdev.desc._name = val; \
88af8bbe
SAS		 153 return len; \
154}
155
156#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
45b6a73f 157static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
88af8bbe
SAS		 158 const char *page, size_t len) \
159{ \
160 u16 val; \
161 int ret; \
162 ret = kstrtou16(page, 0, &val); \
163 if (ret) \
164 return ret; \
45b6a73f 165 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
88af8bbe
SAS		 166 return len; \
167}
168
169#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
170 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
171 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
172
173GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
174GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
175GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
176GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
177GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
178GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
179GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
180GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
181
182static ssize_t is_valid_bcd(u16 bcd_val)
183{
184 if ((bcd_val & 0xf) > 9)
185 return -EINVAL;
186 if (((bcd_val >> 4) & 0xf) > 9)
187 return -EINVAL;
188 if (((bcd_val >> 8) & 0xf) > 9)
189 return -EINVAL;
190 if (((bcd_val >> 12) & 0xf) > 9)
191 return -EINVAL;
192 return 0;
193}
194
45b6a73f 195static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
88af8bbe
SAS		 196 const char *page, size_t len)
197{
198 u16 bcdDevice;
199 int ret;
200
201 ret = kstrtou16(page, 0, &bcdDevice);
202 if (ret)
203 return ret;
204 ret = is_valid_bcd(bcdDevice);
205 if (ret)
206 return ret;
207
45b6a73f 208 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
88af8bbe
SAS		 209 return len;
210}
211
45b6a73f 212static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
88af8bbe
SAS		 213 const char *page, size_t len)
214{
215 u16 bcdUSB;
216 int ret;
217
218 ret = kstrtou16(page, 0, &bcdUSB);
219 if (ret)
220 return ret;
221 ret = is_valid_bcd(bcdUSB);
222 if (ret)
223 return ret;
224
45b6a73f 225 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
88af8bbe
SAS		 226 return len;
227}
228
45b6a73f 229static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
88af8bbe 230{
64e6bbff
EH		 231 struct gadget_info *gi = to_gadget_info(item);
232 char *udc_name;
233 int ret;
234
235 mutex_lock(&gi->lock);
236 udc_name = gi->composite.gadget_driver.udc_name;
237 ret = sprintf(page, "%s\n", udc_name ?: "");
238 mutex_unlock(&gi->lock);
afdaadc3 239
64e6bbff 240 return ret;
88af8bbe
SAS		 241}
242
243static int unregister_gadget(struct gadget_info *gi)
244{
245 int ret;
246
afdaadc3 247 if (!gi->composite.gadget_driver.udc_name)
88af8bbe
SAS		 248 return -ENODEV;
249
250 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
251 if (ret)
252 return ret;
afdaadc3
RB		 253 kfree(gi->composite.gadget_driver.udc_name);
254 gi->composite.gadget_driver.udc_name = NULL;
88af8bbe
SAS		 255 return 0;
256}
257
45b6a73f 258static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
88af8bbe
SAS		 259 const char *page, size_t len)
260{
45b6a73f 261 struct gadget_info *gi = to_gadget_info(item);
88af8bbe
SAS		 262 char *name;
263 int ret;
264
15753588
KK		 265 if (strlen(page) < len)
266 return -EOVERFLOW;
267
88af8bbe
SAS		 268 name = kstrdup(page, GFP_KERNEL);
269 if (!name)
270 return -ENOMEM;
271 if (name[len - 1] == '\n')
272 name[len - 1] = '\0';
273
274 mutex_lock(&gi->lock);
275
276 if (!strlen(name)) {
277 ret = unregister_gadget(gi);
278 if (ret)
279 goto err;
38355b2a 280 kfree(name);
88af8bbe 281 } else {
afdaadc3 282 if (gi->composite.gadget_driver.udc_name) {
88af8bbe
SAS		 283 ret = -EBUSY;
284 goto err;
285 }
afdaadc3
RB		 286 gi->composite.gadget_driver.udc_name = name;
287 ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
288 if (ret) {
289 gi->composite.gadget_driver.udc_name = NULL;
88af8bbe 290 goto err;
afdaadc3 291 }
88af8bbe
SAS		 292 }
293 mutex_unlock(&gi->lock);
294 return len;
295err:
296 kfree(name);
297 mutex_unlock(&gi->lock);
298 return ret;
299}
300
a0249703
TN		 301static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
302 char *page)
303{
304 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
305
306 return sprintf(page, "%s\n", usb_speed_string(speed));
307}
308
309static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
310 const char *page, size_t len)
311{
312 struct gadget_info *gi = to_gadget_info(item);
313
314 mutex_lock(&gi->lock);
315
316 /* Prevent changing of max_speed after the driver is binded */
317 if (gi->composite.gadget_driver.udc_name)
318 goto err;
319
320 if (strncmp(page, "super-speed-plus", 16) == 0)
321 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
322 else if (strncmp(page, "super-speed", 11) == 0)
323 gi->composite.max_speed = USB_SPEED_SUPER;
324 else if (strncmp(page, "high-speed", 10) == 0)
325 gi->composite.max_speed = USB_SPEED_HIGH;
326 else if (strncmp(page, "full-speed", 10) == 0)
327 gi->composite.max_speed = USB_SPEED_FULL;
328 else if (strncmp(page, "low-speed", 9) == 0)
329 gi->composite.max_speed = USB_SPEED_LOW;
330 else
331 goto err;
332
333 gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
334
335 mutex_unlock(&gi->lock);
336 return len;
337err:
338 mutex_unlock(&gi->lock);
339 return -EINVAL;
340}
341
45b6a73f
CH		 342CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
343CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
344CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
345CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
346CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
347CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
348CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
349CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
350CONFIGFS_ATTR(gadget_dev_desc_, UDC);
a0249703 351CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
88af8bbe
SAS		 352
353static struct configfs_attribute *gadget_root_attrs[] = {
45b6a73f
CH		 354 &gadget_dev_desc_attr_bDeviceClass,
355 &gadget_dev_desc_attr_bDeviceSubClass,
356 &gadget_dev_desc_attr_bDeviceProtocol,
357 &gadget_dev_desc_attr_bMaxPacketSize0,
358 &gadget_dev_desc_attr_idVendor,
359 &gadget_dev_desc_attr_idProduct,
360 &gadget_dev_desc_attr_bcdDevice,
361 &gadget_dev_desc_attr_bcdUSB,
362 &gadget_dev_desc_attr_UDC,
a0249703 363 &gadget_dev_desc_attr_max_speed,
88af8bbe
SAS		 364 NULL,
365};
366
88af8bbe
SAS		 367static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
368{
9311a531 369 return container_of(to_config_group(item), struct gadget_strings,
88af8bbe
SAS		 370 group);
371}
372
373static inline struct gadget_config_name *to_gadget_config_name(
374 struct config_item *item)
375{
9311a531 376 return container_of(to_config_group(item), struct gadget_config_name,
88af8bbe
SAS		 377 group);
378}
379
88af8bbe
SAS		 380static inline struct usb_function_instance *to_usb_function_instance(
381 struct config_item *item)
382{
9311a531 383 return container_of(to_config_group(item),
88af8bbe
SAS		 384 struct usb_function_instance, group);
385}
386
387static void gadget_info_attr_release(struct config_item *item)
388{
389 struct gadget_info *gi = to_gadget_info(item);
390
391 WARN_ON(!list_empty(&gi->cdev.configs));
392 WARN_ON(!list_empty(&gi->string_list));
393 WARN_ON(!list_empty(&gi->available_func));
394 kfree(gi->composite.gadget_driver.function);
395 kfree(gi);
396}
397
88af8bbe
SAS		 398static struct configfs_item_operations gadget_root_item_ops = {
399 .release = gadget_info_attr_release,
88af8bbe
SAS		 400};
401
402static void gadget_config_attr_release(struct config_item *item)
403{
404 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
405
406 WARN_ON(!list_empty(&cfg->c.functions));
407 list_del(&cfg->c.list);
408 kfree(cfg->c.label);
409 kfree(cfg);
410}
411
412static int config_usb_cfg_link(
413 struct config_item *usb_cfg_ci,
414 struct config_item *usb_func_ci)
415{
416 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
260d88b7 417 struct gadget_info *gi = cfg_to_gadget_info(cfg);
88af8bbe 418
5284accc
LY		 419 struct usb_function_instance *fi =
420 to_usb_function_instance(usb_func_ci);
36f4c25c 421 struct usb_function_instance *a_fi = NULL, *iter;
88af8bbe
SAS		 422 struct usb_function *f;
423 int ret;
424
425 mutex_lock(&gi->lock);
426 /*
427 * Make sure this function is from within our _this_ gadget and not
428 * from another gadget or a random directory.
429 * Also a function instance can only be linked once.
430 */
36f4c25c
JK		 431 list_for_each_entry(iter, &gi->available_func, cfs_list) {
432 if (iter != fi)
433 continue;
434 a_fi = iter;
435 break;
88af8bbe 436 }
36f4c25c 437 if (!a_fi) {
88af8bbe
SAS		 438 ret = -EINVAL;
439 goto out;
440 }
441
442 list_for_each_entry(f, &cfg->func_list, list) {
443 if (f->fi == fi) {
444 ret = -EEXIST;
445 goto out;
446 }
447 }
448
449 f = usb_get_function(fi);
450 if (IS_ERR(f)) {
451 ret = PTR_ERR(f);
452 goto out;
453 }
454
455 /* stash the function until we bind it to the gadget */
456 list_add_tail(&f->list, &cfg->func_list);
457 ret = 0;
458out:
459 mutex_unlock(&gi->lock);
460 return ret;
461}
462
e16769d4 463static void config_usb_cfg_unlink(
88af8bbe
SAS		 464 struct config_item *usb_cfg_ci,
465 struct config_item *usb_func_ci)
466{
467 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
260d88b7 468 struct gadget_info *gi = cfg_to_gadget_info(cfg);
88af8bbe 469
5284accc
LY		 470 struct usb_function_instance *fi =
471 to_usb_function_instance(usb_func_ci);
88af8bbe
SAS		 472 struct usb_function *f;
473
474 /*
475 * ideally I would like to forbid to unlink functions while a gadget is
476 * bound to an UDC. Since this isn't possible at the moment, we simply
477 * force an unbind, the function is available here and then we can
478 * remove the function.
479 */
480 mutex_lock(&gi->lock);
afdaadc3 481 if (gi->composite.gadget_driver.udc_name)
88af8bbe 482 unregister_gadget(gi);
afdaadc3 483 WARN_ON(gi->composite.gadget_driver.udc_name);
88af8bbe
SAS		 484
485 list_for_each_entry(f, &cfg->func_list, list) {
486 if (f->fi == fi) {
487 list_del(&f->list);
488 usb_put_function(f);
489 mutex_unlock(&gi->lock);
e16769d4 490 return;
88af8bbe
SAS		 491 }
492 }
493 mutex_unlock(&gi->lock);
75bfe23a 494 WARN(1, "Unable to locate function to unbind\n");
88af8bbe
SAS		 495}
496
88af8bbe
SAS		 497static struct configfs_item_operations gadget_config_item_ops = {
498 .release = gadget_config_attr_release,
88af8bbe
SAS		 499 .allow_link = config_usb_cfg_link,
500 .drop_link = config_usb_cfg_unlink,
501};
502
503
45b6a73f 504static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
88af8bbe
SAS		 505 char *page)
506{
c26f1c10
LY		 507 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
508
509 return sprintf(page, "%u\n", cfg->c.MaxPower);
88af8bbe
SAS		 510}
511
45b6a73f 512static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
88af8bbe
SAS		 513 const char *page, size_t len)
514{
c26f1c10 515 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
88af8bbe
SAS		 516 u16 val;
517 int ret;
518 ret = kstrtou16(page, 0, &val);
519 if (ret)
520 return ret;
521 if (DIV_ROUND_UP(val, 8) > 0xff)
522 return -ERANGE;
c26f1c10 523 cfg->c.MaxPower = val;
88af8bbe
SAS		 524 return len;
525}
526
45b6a73f 527static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
88af8bbe
SAS		 528 char *page)
529{
c26f1c10
LY		 530 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
531
532 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
88af8bbe
SAS		 533}
534
45b6a73f 535static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
88af8bbe
SAS		 536 const char *page, size_t len)
537{
c26f1c10 538 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
88af8bbe
SAS		 539 u8 val;
540 int ret;
541 ret = kstrtou8(page, 0, &val);
542 if (ret)
543 return ret;
544 if (!(val & USB_CONFIG_ATT_ONE))
545 return -EINVAL;
546 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
547 USB_CONFIG_ATT_WAKEUP))
548 return -EINVAL;
c26f1c10 549 cfg->c.bmAttributes = val;
88af8bbe
SAS		 550 return len;
551}
552
45b6a73f
CH		 553CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
554CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
88af8bbe
SAS		 555
556static struct configfs_attribute *gadget_config_attrs[] = {
45b6a73f
CH		 557 &gadget_config_desc_attr_MaxPower,
558 &gadget_config_desc_attr_bmAttributes,
88af8bbe
SAS		 559 NULL,
560};
561
4ad01412 562static const struct config_item_type gadget_config_type = {
88af8bbe
SAS		 563 .ct_item_ops = &gadget_config_item_ops,
564 .ct_attrs = gadget_config_attrs,
565 .ct_owner = THIS_MODULE,
566};
567
4ad01412 568static const struct config_item_type gadget_root_type = {
88af8bbe
SAS		 569 .ct_item_ops = &gadget_root_item_ops,
570 .ct_attrs = gadget_root_attrs,
571 .ct_owner = THIS_MODULE,
572};
573
574static void composite_init_dev(struct usb_composite_dev *cdev)
575{
576 spin_lock_init(&cdev->lock);
577 INIT_LIST_HEAD(&cdev->configs);
578 INIT_LIST_HEAD(&cdev->gstrings);
579}
580
581static struct config_group *function_make(
582 struct config_group *group,
583 const char *name)
584{
585 struct gadget_info *gi;
586 struct usb_function_instance *fi;
587 char buf[MAX_NAME_LEN];
588 char *func_name;
589 char *instance_name;
590 int ret;
591
592 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
593 if (ret >= MAX_NAME_LEN)
594 return ERR_PTR(-ENAMETOOLONG);
595
596 func_name = buf;
597 instance_name = strchr(func_name, '.');
598 if (!instance_name) {
599 pr_err("Unable to locate . in FUNC.INSTANCE\n");
600 return ERR_PTR(-EINVAL);
601 }
602 *instance_name = '\0';
603 instance_name++;
604
605 fi = usb_get_function_instance(func_name);
606 if (IS_ERR(fi))
a3469411 607 return ERR_CAST(fi);
88af8bbe 608
3958b792 609 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
88af8bbe
SAS		 610 if (ret) {
611 usb_put_function_instance(fi);
612 return ERR_PTR(ret);
613 }
1933861d
AP		 614 if (fi->set_inst_name) {
615 ret = fi->set_inst_name(fi, instance_name);
616 if (ret) {
617 usb_put_function_instance(fi);
618 return ERR_PTR(ret);
619 }
620 }
88af8bbe
SAS		 621
622 gi = container_of(group, struct gadget_info, functions_group);
623
624 mutex_lock(&gi->lock);
625 list_add_tail(&fi->cfs_list, &gi->available_func);
626 mutex_unlock(&gi->lock);
627 return &fi->group;
628}
629
630static void function_drop(
631 struct config_group *group,
632 struct config_item *item)
633{
634 struct usb_function_instance *fi = to_usb_function_instance(item);
635 struct gadget_info *gi;
636
637 gi = container_of(group, struct gadget_info, functions_group);
638
639 mutex_lock(&gi->lock);
640 list_del(&fi->cfs_list);
641 mutex_unlock(&gi->lock);
642 config_item_put(item);
643}
644
645static struct configfs_group_operations functions_ops = {
646 .make_group = &function_make,
647 .drop_item = &function_drop,
648};
649
4ad01412 650static const struct config_item_type functions_type = {
88af8bbe
SAS		 651 .ct_group_ops = &functions_ops,
652 .ct_owner = THIS_MODULE,
653};
654
88af8bbe
SAS		 655GS_STRINGS_RW(gadget_config_name, configuration);
656
657static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
45b6a73f 658 &gadget_config_name_attr_configuration,
88af8bbe
SAS		 659 NULL,
660};
661
662static void gadget_config_name_attr_release(struct config_item *item)
663{
664 struct gadget_config_name *cn = to_gadget_config_name(item);
665
666 kfree(cn->configuration);
667
668 list_del(&cn->list);
669 kfree(cn);
670}
671
672USB_CONFIG_STRING_RW_OPS(gadget_config_name);
673USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
674
675static struct config_group *config_desc_make(
676 struct config_group *group,
677 const char *name)
678{
679 struct gadget_info *gi;
680 struct config_usb_cfg *cfg;
681 char buf[MAX_NAME_LEN];
682 char *num_str;
683 u8 num;
684 int ret;
685
686 gi = container_of(group, struct gadget_info, configs_group);
687 ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
688 if (ret >= MAX_NAME_LEN)
689 return ERR_PTR(-ENAMETOOLONG);
690
691 num_str = strchr(buf, '.');
692 if (!num_str) {
693 pr_err("Unable to locate . in name.bConfigurationValue\n");
694 return ERR_PTR(-EINVAL);
695 }
696
697 *num_str = '\0';
698 num_str++;
699
700 if (!strlen(buf))
701 return ERR_PTR(-EINVAL);
702
703 ret = kstrtou8(num_str, 0, &num);
704 if (ret)
705 return ERR_PTR(ret);
706
707 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
708 if (!cfg)
709 return ERR_PTR(-ENOMEM);
710 cfg->c.label = kstrdup(buf, GFP_KERNEL);
711 if (!cfg->c.label) {
712 ret = -ENOMEM;
713 goto err;
714 }
715 cfg->c.bConfigurationValue = num;
716 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
717 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
718 INIT_LIST_HEAD(&cfg->string_list);
719 INIT_LIST_HEAD(&cfg->func_list);
720
88af8bbe
SAS		 721 config_group_init_type_name(&cfg->group, name,
722 &gadget_config_type);
1ae1602d 723
88af8bbe
SAS		 724 config_group_init_type_name(&cfg->strings_group, "strings",
725 &gadget_config_name_strings_type);
1ae1602d 726 configfs_add_default_group(&cfg->strings_group, &cfg->group);
88af8bbe
SAS		 727
728 ret = usb_add_config_only(&gi->cdev, &cfg->c);
729 if (ret)
730 goto err;
731
732 return &cfg->group;
733err:
734 kfree(cfg->c.label);
735 kfree(cfg);
736 return ERR_PTR(ret);
737}
738
739static void config_desc_drop(
740 struct config_group *group,
741 struct config_item *item)
742{
743 config_item_put(item);
744}
745
746static struct configfs_group_operations config_desc_ops = {
747 .make_group = &config_desc_make,
748 .drop_item = &config_desc_drop,
749};
750
4ad01412 751static const struct config_item_type config_desc_type = {
88af8bbe
SAS		 752 .ct_group_ops = &config_desc_ops,
753 .ct_owner = THIS_MODULE,
754};
755
88af8bbe
SAS		 756GS_STRINGS_RW(gadget_strings, manufacturer);
757GS_STRINGS_RW(gadget_strings, product);
758GS_STRINGS_RW(gadget_strings, serialnumber);
759
760static struct configfs_attribute *gadget_strings_langid_attrs[] = {
45b6a73f
CH		 761 &gadget_strings_attr_manufacturer,
762 &gadget_strings_attr_product,
763 &gadget_strings_attr_serialnumber,
88af8bbe
SAS		 764 NULL,
765};
766
767static void gadget_strings_attr_release(struct config_item *item)
768{
769 struct gadget_strings *gs = to_gadget_strings(item);
770
771 kfree(gs->manufacturer);
772 kfree(gs->product);
773 kfree(gs->serialnumber);
774
775 list_del(&gs->list);
776 kfree(gs);
777}
778
779USB_CONFIG_STRING_RW_OPS(gadget_strings);
780USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
781
45b6a73f
CH		 782static inline struct gadget_info *os_desc_item_to_gadget_info(
783 struct config_item *item)
87213d38 784{
167a799c
LY		 785 return container_of(to_config_group(item),
786 struct gadget_info, os_desc_group);
45b6a73f 787}
87213d38 788
45b6a73f
CH		 789static ssize_t os_desc_use_show(struct config_item *item, char *page)
790{
e800e8cb 791 return sprintf(page, "%d\n",
45b6a73f 792 os_desc_item_to_gadget_info(item)->use_os_desc);
87213d38
AP		 793}
794
45b6a73f 795static ssize_t os_desc_use_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 ret;
800 bool use;
801
87213d38
AP		 802 mutex_lock(&gi->lock);
803 ret = strtobool(page, &use);
804 if (!ret) {
805 gi->use_os_desc = use;
806 ret = len;
807 }
808 mutex_unlock(&gi->lock);
809
810 return ret;
811}
812
45b6a73f 813static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
87213d38 814{
e800e8cb 815 return sprintf(page, "0x%02x\n",
45b6a73f 816 os_desc_item_to_gadget_info(item)->b_vendor_code);
87213d38
AP		 817}
818
45b6a73f 819static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
87213d38
AP		 820 const char *page, size_t len)
821{
45b6a73f 822 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
87213d38
AP		 823 int ret;
824 u8 b_vendor_code;
825
87213d38
AP		 826 mutex_lock(&gi->lock);
827 ret = kstrtou8(page, 0, &b_vendor_code);
828 if (!ret) {
829 gi->b_vendor_code = b_vendor_code;
830 ret = len;
831 }
832 mutex_unlock(&gi->lock);
833
834 return ret;
835}
836
45b6a73f 837static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
87213d38 838{
45b6a73f 839 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
76180d71 840 int res;
87213d38 841
76180d71
SA		 842 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
843 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
844 page[res++] = '\n';
845
846 return res;
87213d38
AP		 847}
848
45b6a73f 849static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
87213d38
AP		 850 size_t len)
851{
45b6a73f 852 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
87213d38
AP		 853 int res, l;
854
87213d38
AP		 855 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
856 if (page[l - 1] == '\n')
857 --l;
858
859 mutex_lock(&gi->lock);
860 res = utf8s_to_utf16s(page, l,
861 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
862 OS_STRING_QW_SIGN_LEN);
863 if (res > 0)
864 res = len;
865 mutex_unlock(&gi->lock);
866
867 return res;
868}
869
45b6a73f
CH		 870CONFIGFS_ATTR(os_desc_, use);
871CONFIGFS_ATTR(os_desc_, b_vendor_code);
872CONFIGFS_ATTR(os_desc_, qw_sign);
87213d38
AP		 873
874static struct configfs_attribute *os_desc_attrs[] = {
45b6a73f
CH		 875 &os_desc_attr_use,
876 &os_desc_attr_b_vendor_code,
877 &os_desc_attr_qw_sign,
87213d38
AP		 878 NULL,
879};
880
da424314
AP		 881static int os_desc_link(struct config_item *os_desc_ci,
882 struct config_item *usb_cfg_ci)
883{
167a799c 884 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
da424314 885 struct usb_composite_dev *cdev = &gi->cdev;
5d143ec4 886 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
36f4c25c 887 struct usb_configuration *c = NULL, *iter;
da424314
AP		 888 int ret;
889
890 mutex_lock(&gi->lock);
36f4c25c
JK		 891 list_for_each_entry(iter, &cdev->configs, list) {
892 if (iter != &c_target->c)
893 continue;
894 c = iter;
895 break;
da424314 896 }
36f4c25c 897 if (!c) {
da424314
AP		 898 ret = -EINVAL;
899 goto out;
900 }
901
902 if (cdev->os_desc_config) {
903 ret = -EBUSY;
904 goto out;
905 }
906
907 cdev->os_desc_config = &c_target->c;
908 ret = 0;
909
910out:
911 mutex_unlock(&gi->lock);
912 return ret;
913}
914
e16769d4 915static void os_desc_unlink(struct config_item *os_desc_ci,
da424314
AP		 916 struct config_item *usb_cfg_ci)
917{
167a799c 918 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
da424314
AP		 919 struct usb_composite_dev *cdev = &gi->cdev;
920
921 mutex_lock(&gi->lock);
afdaadc3 922 if (gi->composite.gadget_driver.udc_name)
da424314
AP		 923 unregister_gadget(gi);
924 cdev->os_desc_config = NULL;
afdaadc3 925 WARN_ON(gi->composite.gadget_driver.udc_name);
da424314 926 mutex_unlock(&gi->lock);
da424314
AP		 927}
928
87213d38 929static struct configfs_item_operations os_desc_ops = {
da424314
AP		 930 .allow_link = os_desc_link,
931 .drop_link = os_desc_unlink,
87213d38
AP		 932};
933
934static struct config_item_type os_desc_type = {
935 .ct_item_ops = &os_desc_ops,
936 .ct_attrs = os_desc_attrs,
937 .ct_owner = THIS_MODULE,
938};
939
7419485f
AP		 940static inline struct usb_os_desc_ext_prop
941*to_usb_os_desc_ext_prop(struct config_item *item)
942{
943 return container_of(item, struct usb_os_desc_ext_prop, item);
944}
945
45b6a73f 946static ssize_t ext_prop_type_show(struct config_item *item, char *page)
7419485f 947{
e800e8cb 948 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
7419485f
AP		 949}
950
45b6a73f 951static ssize_t ext_prop_type_store(struct config_item *item,
7419485f
AP		 952 const char *page, size_t len)
953{
45b6a73f 954 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
7419485f
AP		 955 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
956 u8 type;
957 int ret;
958
959 if (desc->opts_mutex)
960 mutex_lock(desc->opts_mutex);
961 ret = kstrtou8(page, 0, &type);
962 if (ret)
963 goto end;
964 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
965 ret = -EINVAL;
966 goto end;
967 }
968
969 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
970 ext_prop->type == USB_EXT_PROP_LE32 ||
971 ext_prop->type == USB_EXT_PROP_BE32) &&
972 (type == USB_EXT_PROP_UNICODE ||
973 type == USB_EXT_PROP_UNICODE_ENV ||
974 type == USB_EXT_PROP_UNICODE_LINK))
975 ext_prop->data_len <<= 1;
976 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
977 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
978 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
979 (type == USB_EXT_PROP_BINARY ||
980 type == USB_EXT_PROP_LE32 ||
981 type == USB_EXT_PROP_BE32))
982 ext_prop->data_len >>= 1;
983 ext_prop->type = type;
984 ret = len;
985
986end:
987 if (desc->opts_mutex)
988 mutex_unlock(desc->opts_mutex);
989 return ret;
990}
991
45b6a73f 992static ssize_t ext_prop_data_show(struct config_item *item, char *page)
7419485f 993{
45b6a73f 994 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
7419485f
AP		 995 int len = ext_prop->data_len;
996
997 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
998 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
999 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1000 len >>= 1;
1001 memcpy(page, ext_prop->data, len);
1002
1003 return len;
1004}
1005
45b6a73f 1006static ssize_t ext_prop_data_store(struct config_item *item,
7419485f
AP		 1007 const char *page, size_t len)
1008{
45b6a73f 1009 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
7419485f
AP		 1010 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1011 char *new_data;
1012 size_t ret_len = len;
1013
1014 if (page[len - 1] == '\n' || page[len - 1] == '\0')
1015 --len;
58b949e0 1016 new_data = kmemdup(page, len, GFP_KERNEL);
7419485f
AP		 1017 if (!new_data)
1018 return -ENOMEM;
1019
7419485f
AP		 1020 if (desc->opts_mutex)
1021 mutex_lock(desc->opts_mutex);
1022 kfree(ext_prop->data);
1023 ext_prop->data = new_data;
1024 desc->ext_prop_len -= ext_prop->data_len;
1025 ext_prop->data_len = len;
1026 desc->ext_prop_len += ext_prop->data_len;
1027 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1028 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1029 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1030 desc->ext_prop_len -= ext_prop->data_len;
1031 ext_prop->data_len <<= 1;
1032 ext_prop->data_len += 2;
1033 desc->ext_prop_len += ext_prop->data_len;
1034 }
1035 if (desc->opts_mutex)
1036 mutex_unlock(desc->opts_mutex);
1037 return ret_len;
1038}
1039
45b6a73f
CH		 1040CONFIGFS_ATTR(ext_prop_, type);
1041CONFIGFS_ATTR(ext_prop_, data);
7419485f
AP		 1042
1043static struct configfs_attribute *ext_prop_attrs[] = {
45b6a73f
CH		 1044 &ext_prop_attr_type,
1045 &ext_prop_attr_data,
7419485f
AP		 1046 NULL,
1047};
1048
1049static void usb_os_desc_ext_prop_release(struct config_item *item)
1050{
1051 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1052
1053 kfree(ext_prop); /* frees a whole chunk */
1054}
1055
1056static struct configfs_item_operations ext_prop_ops = {
1057 .release = usb_os_desc_ext_prop_release,
7419485f
AP		 1058};
1059
1060static struct config_item *ext_prop_make(
1061 struct config_group *group,
1062 const char *name)
1063{
1064 struct usb_os_desc_ext_prop *ext_prop;
1065 struct config_item_type *ext_prop_type;
1066 struct usb_os_desc *desc;
1067 char *vlabuf;
1068
1069 vla_group(data_chunk);
1070 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1071 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1072
1073 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1074 if (!vlabuf)
1075 return ERR_PTR(-ENOMEM);
1076
1077 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1078 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1079
1080 desc = container_of(group, struct usb_os_desc, group);
1081 ext_prop_type->ct_item_ops = &ext_prop_ops;
1082 ext_prop_type->ct_attrs = ext_prop_attrs;
1083 ext_prop_type->ct_owner = desc->owner;
1084
1085 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1086
1087 ext_prop->name = kstrdup(name, GFP_KERNEL);
1088 if (!ext_prop->name) {
1089 kfree(vlabuf);
1090 return ERR_PTR(-ENOMEM);
1091 }
1092 desc->ext_prop_len += 14;
1093 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1094 if (desc->opts_mutex)
1095 mutex_lock(desc->opts_mutex);
1096 desc->ext_prop_len += ext_prop->name_len;
1097 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1098 ++desc->ext_prop_count;
1099 if (desc->opts_mutex)
1100 mutex_unlock(desc->opts_mutex);
1101
1102 return &ext_prop->item;
1103}
1104
1105static void ext_prop_drop(struct config_group *group, struct config_item *item)
1106{
1107 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1108 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1109
1110 if (desc->opts_mutex)
1111 mutex_lock(desc->opts_mutex);
1112 list_del(&ext_prop->entry);
1113 --desc->ext_prop_count;
1114 kfree(ext_prop->name);
1115 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1116 if (desc->opts_mutex)
1117 mutex_unlock(desc->opts_mutex);
1118 config_item_put(item);
1119}
1120
1121static struct configfs_group_operations interf_grp_ops = {
1122 .make_item = &ext_prop_make,
1123 .drop_item = &ext_prop_drop,
1124};
1125
45b6a73f 1126static ssize_t interf_grp_compatible_id_show(struct config_item *item,
fe00b138 1127 char *page)
da424314 1128{
45b6a73f 1129 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
da424314
AP		 1130 return 8;
1131}
1132
45b6a73f 1133static ssize_t interf_grp_compatible_id_store(struct config_item *item,
fe00b138 1134 const char *page, size_t len)
da424314 1135{
45b6a73f 1136 struct usb_os_desc *desc = to_usb_os_desc(item);
da424314
AP		 1137 int l;
1138
1139 l = min_t(int, 8, len);
1140 if (page[l - 1] == '\n')
1141 --l;
1142 if (desc->opts_mutex)
1143 mutex_lock(desc->opts_mutex);
1144 memcpy(desc->ext_compat_id, page, l);
da424314
AP		 1145
1146 if (desc->opts_mutex)
1147 mutex_unlock(desc->opts_mutex);
1148
1149 return len;
1150}
1151
45b6a73f 1152static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
fe00b138 1153 char *page)
da424314 1154{
45b6a73f 1155 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
da424314
AP		 1156 return 8;
1157}
1158
45b6a73f 1159static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
fe00b138 1160 const char *page, size_t len)
da424314 1161{
45b6a73f 1162 struct usb_os_desc *desc = to_usb_os_desc(item);
da424314
AP		 1163 int l;
1164
1165 l = min_t(int, 8, len);
1166 if (page[l - 1] == '\n')
1167 --l;
1168 if (desc->opts_mutex)
1169 mutex_lock(desc->opts_mutex);
1170 memcpy(desc->ext_compat_id + 8, page, l);
da424314
AP		 1171
1172 if (desc->opts_mutex)
1173 mutex_unlock(desc->opts_mutex);
1174
1175 return len;
1176}
1177
45b6a73f
CH		 1178CONFIGFS_ATTR(interf_grp_, compatible_id);
1179CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
da424314
AP		 1180
1181static struct configfs_attribute *interf_grp_attrs[] = {
45b6a73f
CH		 1182 &interf_grp_attr_compatible_id,
1183 &interf_grp_attr_sub_compatible_id,
da424314
AP		 1184 NULL
1185};
1186
ff74745e
AG		 1187struct config_group *usb_os_desc_prepare_interf_dir(
1188 struct config_group *parent,
1189 int n_interf,
1190 struct usb_os_desc **desc,
1191 char **names,
1192 struct module *owner)
da424314 1193{
1ae1602d 1194 struct config_group *os_desc_group;
da424314
AP		 1195 struct config_item_type *os_desc_type, *interface_type;
1196
1197 vla_group(data_chunk);
da424314 1198 vla_item(data_chunk, struct config_group, os_desc_group, 1);
da424314
AP		 1199 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1200 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1201
1202 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1203 if (!vlabuf)
ff74745e 1204 return ERR_PTR(-ENOMEM);
da424314 1205
da424314
AP		 1206 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1207 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
da424314
AP		 1208 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1209
da424314
AP		 1210 os_desc_type->ct_owner = owner;
1211 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1ae1602d 1212 configfs_add_default_group(os_desc_group, parent);
da424314 1213
7419485f 1214 interface_type->ct_group_ops = &interf_grp_ops;
da424314
AP		 1215 interface_type->ct_attrs = interf_grp_attrs;
1216 interface_type->ct_owner = owner;
1217
1218 while (n_interf--) {
1219 struct usb_os_desc *d;
1220
1221 d = desc[n_interf];
7419485f 1222 d->owner = owner;
da424314 1223 config_group_init_type_name(&d->group, "", interface_type);
14574b54
AP		 1224 config_item_set_name(&d->group.cg_item, "interface.%s",
1225 names[n_interf]);
1ae1602d 1226 configfs_add_default_group(&d->group, os_desc_group);
da424314
AP		 1227 }
1228
ff74745e 1229 return os_desc_group;
da424314
AP		 1230}
1231EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1232
88af8bbe
SAS		 1233static int configfs_do_nothing(struct usb_composite_dev *cdev)
1234{
75bfe23a 1235 WARN_ON(1);
88af8bbe
SAS		 1236 return -EINVAL;
1237}
1238
1239int composite_dev_prepare(struct usb_composite_driver *composite,
1240 struct usb_composite_dev *dev);
1241
da424314
AP		 1242int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1243 struct usb_ep *ep0);
1244
88af8bbe
SAS		 1245static void purge_configs_funcs(struct gadget_info *gi)
1246{
1247 struct usb_configuration *c;
1248
1249 list_for_each_entry(c, &gi->cdev.configs, list) {
1250 struct usb_function *f, *tmp;
1251 struct config_usb_cfg *cfg;
1252
1253 cfg = container_of(c, struct config_usb_cfg, c);
1254
6cd0fe91 1255 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
88af8bbe 1256
6cd0fe91 1257 list_move(&f->list, &cfg->func_list);
88af8bbe 1258 if (f->unbind) {
da7b895d 1259 dev_dbg(&gi->cdev.gadget->dev,
ad22a666
PS		 1260 "unbind function '%s'/%p\n",
1261 f->name, f);
88af8bbe
SAS		 1262 f->unbind(c, f);
1263 }
1264 }
1265 c->next_interface_id = 0;
903124fe 1266 memset(c->interface, 0, sizeof(c->interface));
554eead5 1267 c->superspeed_plus = 0;
88af8bbe
SAS		 1268 c->superspeed = 0;
1269 c->highspeed = 0;
1270 c->fullspeed = 0;
1271 }
1272}
1273
1274static int configfs_composite_bind(struct usb_gadget *gadget,
1275 struct usb_gadget_driver *gdriver)
1276{
1277 struct usb_composite_driver *composite = to_cdriver(gdriver);
1278 struct gadget_info *gi = container_of(composite,
1279 struct gadget_info, composite);
1280 struct usb_composite_dev *cdev = &gi->cdev;
1281 struct usb_configuration *c;
1282 struct usb_string *s;
1283 unsigned i;
1284 int ret;
1285
1286 /* the gi->lock is hold by the caller */
1a1c851b 1287 gi->unbind = 0;
88af8bbe
SAS		 1288 cdev->gadget = gadget;
1289 set_gadget_data(gadget, cdev);
1290 ret = composite_dev_prepare(composite, cdev);
1291 if (ret)
1292 return ret;
1293 /* and now the gadget bind */
1294 ret = -EINVAL;
1295
1296 if (list_empty(&gi->cdev.configs)) {
4d9f872c 1297 pr_err("Need at least one configuration in %s.\n",
88af8bbe
SAS		 1298 gi->composite.name);
1299 goto err_comp_cleanup;
1300 }
1301
1302
1303 list_for_each_entry(c, &gi->cdev.configs, list) {
1304 struct config_usb_cfg *cfg;
1305
1306 cfg = container_of(c, struct config_usb_cfg, c);
1307 if (list_empty(&cfg->func_list)) {
4d9f872c 1308 pr_err("Config %s/%d of %s needs at least one function.\n",
88af8bbe
SAS		 1309 c->label, c->bConfigurationValue,
1310 gi->composite.name);
1311 goto err_comp_cleanup;
1312 }
1313 }
1314
1315 /* init all strings */
1316 if (!list_empty(&gi->string_list)) {
1317 struct gadget_strings *gs;
1318
1319 i = 0;
1320 list_for_each_entry(gs, &gi->string_list, list) {
1321
1322 gi->gstrings[i] = &gs->stringtab_dev;
1323 gs->stringtab_dev.strings = gs->strings;
1324 gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
1325 gs->manufacturer;
1326 gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
1327 gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
1328 i++;
1329 }
1330 gi->gstrings[i] = NULL;
1331 s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
1332 USB_GADGET_FIRST_AVAIL_IDX);
fea77077
WY		 1333 if (IS_ERR(s)) {
1334 ret = PTR_ERR(s);
88af8bbe 1335 goto err_comp_cleanup;
fea77077 1336 }
88af8bbe
SAS		 1337
1338 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1339 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1340 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1341 }
1342
87213d38
AP		 1343 if (gi->use_os_desc) {
1344 cdev->use_os_string = true;
1345 cdev->b_vendor_code = gi->b_vendor_code;
1346 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1347 }
1348
41ce84c8
LJ		 1349 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1350 struct usb_descriptor_header *usb_desc;
1351
1352 usb_desc = usb_otg_descriptor_alloc(gadget);
1353 if (!usb_desc) {
1354 ret = -ENOMEM;
1355 goto err_comp_cleanup;
1356 }
1357 usb_otg_descriptor_init(gadget, usb_desc);
1358 otg_desc[0] = usb_desc;
1359 otg_desc[1] = NULL;
1360 }
1361
88af8bbe
SAS		 1362 /* Go through all configs, attach all functions */
1363 list_for_each_entry(c, &gi->cdev.configs, list) {
1364 struct config_usb_cfg *cfg;
1365 struct usb_function *f;
1366 struct usb_function *tmp;
1367 struct gadget_config_name *cn;
1368
41ce84c8
LJ		 1369 if (gadget_is_otg(gadget))
1370 c->descriptors = otg_desc;
1371
88af8bbe
SAS		 1372 cfg = container_of(c, struct config_usb_cfg, c);
1373 if (!list_empty(&cfg->string_list)) {
1374 i = 0;
1375 list_for_each_entry(cn, &cfg->string_list, list) {
1376 cfg->gstrings[i] = &cn->stringtab_dev;
1377 cn->stringtab_dev.strings = &cn->strings;
1378 cn->strings.s = cn->configuration;
1379 i++;
1380 }
1381 cfg->gstrings[i] = NULL;
1382 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
fea77077
WY		 1383 if (IS_ERR(s)) {
1384 ret = PTR_ERR(s);
88af8bbe 1385 goto err_comp_cleanup;
fea77077 1386 }
88af8bbe
SAS		 1387 c->iConfiguration = s[0].id;
1388 }
1389
1390 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1391 list_del(&f->list);
1392 ret = usb_add_function(c, f);
5a68e9b5
AP		 1393 if (ret) {
1394 list_add(&f->list, &cfg->func_list);
88af8bbe 1395 goto err_purge_funcs;
5a68e9b5 1396 }
88af8bbe 1397 }
7adf9e3a
WC		 1398 ret = usb_gadget_check_config(cdev->gadget);
1399 if (ret)
1400 goto err_purge_funcs;
1401
88af8bbe
SAS		 1402 usb_ep_autoconfig_reset(cdev->gadget);
1403 }
da424314
AP		 1404 if (cdev->use_os_string) {
1405 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1406 if (ret)
1407 goto err_purge_funcs;
1408 }
1409
88af8bbe
SAS		 1410 usb_ep_autoconfig_reset(cdev->gadget);
1411 return 0;
1412
1413err_purge_funcs:
1414 purge_configs_funcs(gi);
1415err_comp_cleanup:
1416 composite_dev_cleanup(cdev);
1417 return ret;
1418}
1419
1420static void configfs_composite_unbind(struct usb_gadget *gadget)
1421{
1422 struct usb_composite_dev *cdev;
1423 struct gadget_info *gi;
1a1c851b 1424 unsigned long flags;
88af8bbe
SAS		 1425
1426 /* the gi->lock is hold by the caller */
1427
1428 cdev = get_gadget_data(gadget);
1429 gi = container_of(cdev, struct gadget_info, cdev);
1a1c851b
PC		 1430 spin_lock_irqsave(&gi->spinlock, flags);
1431 gi->unbind = 1;
1432 spin_unlock_irqrestore(&gi->spinlock, flags);
88af8bbe 1433
41ce84c8
LJ		 1434 kfree(otg_desc[0]);
1435 otg_desc[0] = NULL;
88af8bbe
SAS		 1436 purge_configs_funcs(gi);
1437 composite_dev_cleanup(cdev);
1438 usb_ep_autoconfig_reset(cdev->gadget);
1a1c851b 1439 spin_lock_irqsave(&gi->spinlock, flags);
88af8bbe
SAS		 1440 cdev->gadget = NULL;
1441 set_gadget_data(gadget, NULL);
1a1c851b
PC		 1442 spin_unlock_irqrestore(&gi->spinlock, flags);
1443}
1444
1445static int configfs_composite_setup(struct usb_gadget *gadget,
1446 const struct usb_ctrlrequest *ctrl)
1447{
1448 struct usb_composite_dev *cdev;
1449 struct gadget_info *gi;
1450 unsigned long flags;
1451 int ret;
1452
1453 cdev = get_gadget_data(gadget);
1454 if (!cdev)
1455 return 0;
1456
1457 gi = container_of(cdev, struct gadget_info, cdev);
1458 spin_lock_irqsave(&gi->spinlock, flags);
1459 cdev = get_gadget_data(gadget);
1460 if (!cdev || gi->unbind) {
1461 spin_unlock_irqrestore(&gi->spinlock, flags);
1462 return 0;
1463 }
1464
1465 ret = composite_setup(gadget, ctrl);
1466 spin_unlock_irqrestore(&gi->spinlock, flags);
1467 return ret;
1468}
1469
1470static void configfs_composite_disconnect(struct usb_gadget *gadget)
1471{
1472 struct usb_composite_dev *cdev;
1473 struct gadget_info *gi;
1474 unsigned long flags;
1475
1476 cdev = get_gadget_data(gadget);
1477 if (!cdev)
1478 return;
1479
1480 gi = container_of(cdev, struct gadget_info, cdev);
1481 spin_lock_irqsave(&gi->spinlock, flags);
1482 cdev = get_gadget_data(gadget);
1483 if (!cdev || gi->unbind) {
1484 spin_unlock_irqrestore(&gi->spinlock, flags);
1485 return;
1486 }
1487
1488 composite_disconnect(gadget);
1489 spin_unlock_irqrestore(&gi->spinlock, flags);
1490}
1491
4d7aae9f
WC		 1492static void configfs_composite_reset(struct usb_gadget *gadget)
1493{
1494 struct usb_composite_dev *cdev;
1495 struct gadget_info *gi;
1496 unsigned long flags;
1497
1498 cdev = get_gadget_data(gadget);
1499 if (!cdev)
1500 return;
1501
1502 gi = container_of(cdev, struct gadget_info, cdev);
1503 spin_lock_irqsave(&gi->spinlock, flags);
1504 cdev = get_gadget_data(gadget);
1505 if (!cdev || gi->unbind) {
1506 spin_unlock_irqrestore(&gi->spinlock, flags);
1507 return;
1508 }
1509
1510 composite_reset(gadget);
1511 spin_unlock_irqrestore(&gi->spinlock, flags);
1512}
1513
1a1c851b
PC		 1514static void configfs_composite_suspend(struct usb_gadget *gadget)
1515{
1516 struct usb_composite_dev *cdev;
1517 struct gadget_info *gi;
1518 unsigned long flags;
1519
1520 cdev = get_gadget_data(gadget);
1521 if (!cdev)
1522 return;
1523
1524 gi = container_of(cdev, struct gadget_info, cdev);
1525 spin_lock_irqsave(&gi->spinlock, flags);
1526 cdev = get_gadget_data(gadget);
1527 if (!cdev || gi->unbind) {
1528 spin_unlock_irqrestore(&gi->spinlock, flags);
1529 return;
1530 }
1531
1532 composite_suspend(gadget);
1533 spin_unlock_irqrestore(&gi->spinlock, flags);
1534}
1535
1536static void configfs_composite_resume(struct usb_gadget *gadget)
1537{
1538 struct usb_composite_dev *cdev;
1539 struct gadget_info *gi;
1540 unsigned long flags;
1541
1542 cdev = get_gadget_data(gadget);
1543 if (!cdev)
1544 return;
1545
1546 gi = container_of(cdev, struct gadget_info, cdev);
1547 spin_lock_irqsave(&gi->spinlock, flags);
1548 cdev = get_gadget_data(gadget);
1549 if (!cdev || gi->unbind) {
1550 spin_unlock_irqrestore(&gi->spinlock, flags);
1551 return;
1552 }
1553
1554 composite_resume(gadget);
1555 spin_unlock_irqrestore(&gi->spinlock, flags);
88af8bbe
SAS		 1556}
1557
1558static const struct usb_gadget_driver configfs_driver_template = {
1559 .bind = configfs_composite_bind,
1560 .unbind = configfs_composite_unbind,
1561
1a1c851b 1562 .setup = configfs_composite_setup,
4d7aae9f 1563 .reset = configfs_composite_reset,
1a1c851b 1564 .disconnect = configfs_composite_disconnect,
88af8bbe 1565
1a1c851b
PC		 1566 .suspend = configfs_composite_suspend,
1567 .resume = configfs_composite_resume,
3a571870 1568
e2459108 1569 .max_speed = USB_SPEED_SUPER_PLUS,
88af8bbe
SAS		 1570 .driver = {
1571 .owner = THIS_MODULE,
1572 .name = "configfs-gadget",
1573 },
f1bddbb3 1574 .match_existing_only = 1,
88af8bbe
SAS		 1575};
1576
1577static struct config_group *gadgets_make(
1578 struct config_group *group,
1579 const char *name)
1580{
1581 struct gadget_info *gi;
1582
1583 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1584 if (!gi)
1585 return ERR_PTR(-ENOMEM);
1586
1ae1602d 1587 config_group_init_type_name(&gi->group, name, &gadget_root_type);
88af8bbe
SAS		 1588
1589 config_group_init_type_name(&gi->functions_group, "functions",
1590 &functions_type);
1ae1602d
CH		 1591 configfs_add_default_group(&gi->functions_group, &gi->group);
1592
88af8bbe
SAS		 1593 config_group_init_type_name(&gi->configs_group, "configs",
1594 &config_desc_type);
1ae1602d
CH		 1595 configfs_add_default_group(&gi->configs_group, &gi->group);
1596
88af8bbe
SAS		 1597 config_group_init_type_name(&gi->strings_group, "strings",
1598 &gadget_strings_strings_type);
1ae1602d
CH		 1599 configfs_add_default_group(&gi->strings_group, &gi->group);
1600
87213d38
AP		 1601 config_group_init_type_name(&gi->os_desc_group, "os_desc",
1602 &os_desc_type);
1ae1602d 1603 configfs_add_default_group(&gi->os_desc_group, &gi->group);
88af8bbe
SAS		 1604
1605 gi->composite.bind = configfs_do_nothing;
1606 gi->composite.unbind = configfs_do_nothing;
1607 gi->composite.suspend = NULL;
1608 gi->composite.resume = NULL;
e2459108 1609 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
88af8bbe 1610
093edc2b 1611 spin_lock_init(&gi->spinlock);
88af8bbe
SAS		 1612 mutex_init(&gi->lock);
1613 INIT_LIST_HEAD(&gi->string_list);
1614 INIT_LIST_HEAD(&gi->available_func);
1615
1616 composite_init_dev(&gi->cdev);
1617 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
1618 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
1619 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
1620
1621 gi->composite.gadget_driver = configfs_driver_template;
1622
1623 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
1624 gi->composite.name = gi->composite.gadget_driver.function;
1625
1626 if (!gi->composite.gadget_driver.function)
1627 goto err;
1628
88af8bbe
SAS		 1629 return &gi->group;
1630err:
1631 kfree(gi);
1632 return ERR_PTR(-ENOMEM);
1633}
1634
1635static void gadgets_drop(struct config_group *group, struct config_item *item)
1636{
1637 config_item_put(item);
1638}
1639
1640static struct configfs_group_operations gadgets_ops = {
1641 .make_group = &gadgets_make,
1642 .drop_item = &gadgets_drop,
1643};
1644
4ad01412 1645static const struct config_item_type gadgets_type = {
88af8bbe
SAS		 1646 .ct_group_ops = &gadgets_ops,
1647 .ct_owner = THIS_MODULE,
1648};
1649
1650static struct configfs_subsystem gadget_subsys = {
1651 .su_group = {
1652 .cg_item = {
1653 .ci_namebuf = "usb_gadget",
1654 .ci_type = &gadgets_type,
1655 },
1656 },
1657 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
1658};
1659
092a4bd0
AP		 1660void unregister_gadget_item(struct config_item *item)
1661{
1662 struct gadget_info *gi = to_gadget_info(item);
1663
cee51c33 1664 mutex_lock(&gi->lock);
092a4bd0 1665 unregister_gadget(gi);
cee51c33 1666 mutex_unlock(&gi->lock);
092a4bd0 1667}
0700faaf 1668EXPORT_SYMBOL_GPL(unregister_gadget_item);
092a4bd0 1669
88af8bbe
SAS		 1670static int __init gadget_cfs_init(void)
1671{
1672 int ret;
1673
1674 config_group_init(&gadget_subsys.su_group);
1675
1676 ret = configfs_register_subsystem(&gadget_subsys);
1677 return ret;
1678}
1679module_init(gadget_cfs_init);
1680
1681static void __exit gadget_cfs_exit(void)
1682{
1683 configfs_unregister_subsystem(&gadget_subsys);
1684}
1685module_exit(gadget_cfs_exit);
Linux 6.x block layer and io_uring tree(s)