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17#include <linux/slab.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/device.h>
21#include <linux/err.h>
22
23#include "u_serial.h"
24#include "gadget_chips.h"
25
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43
44struct f_acm {
45 struct gserial port;
46 u8 ctrl_id, data_id;
47 u8 port_num;
48
49 u8 pending;
50
51
52
53
54
55 spinlock_t lock;
56
57 struct usb_ep *notify;
58 struct usb_request *notify_req;
59
60 struct usb_cdc_line_coding port_line_coding;
61
62
63 u16 port_handshake_bits;
64#define ACM_CTRL_RTS (1 << 1)
65#define ACM_CTRL_DTR (1 << 0)
66
67
68 u16 serial_state;
69#define ACM_CTRL_OVERRUN (1 << 6)
70#define ACM_CTRL_PARITY (1 << 5)
71#define ACM_CTRL_FRAMING (1 << 4)
72#define ACM_CTRL_RI (1 << 3)
73#define ACM_CTRL_BRK (1 << 2)
74#define ACM_CTRL_DSR (1 << 1)
75#define ACM_CTRL_DCD (1 << 0)
76};
77
78static inline struct f_acm *func_to_acm(struct usb_function *f)
79{
80 return container_of(f, struct f_acm, port.func);
81}
82
83static inline struct f_acm *port_to_acm(struct gserial *p)
84{
85 return container_of(p, struct f_acm, port);
86}
87
88
89
90
91
92#define GS_NOTIFY_INTERVAL_MS 32
93#define GS_NOTIFY_MAXPACKET 10
94
95
96
97static struct usb_interface_assoc_descriptor
98acm_iad_descriptor = {
99 .bLength = sizeof acm_iad_descriptor,
100 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
101
102
103 .bInterfaceCount = 2,
104 .bFunctionClass = USB_CLASS_COMM,
105 .bFunctionSubClass = USB_CDC_SUBCLASS_ACM,
106 .bFunctionProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
107
108};
109
110
111static struct usb_interface_descriptor acm_control_interface_desc = {
112 .bLength = USB_DT_INTERFACE_SIZE,
113 .bDescriptorType = USB_DT_INTERFACE,
114
115 .bNumEndpoints = 1,
116 .bInterfaceClass = USB_CLASS_COMM,
117 .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
118 .bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
119
120};
121
122static struct usb_interface_descriptor acm_data_interface_desc = {
123 .bLength = USB_DT_INTERFACE_SIZE,
124 .bDescriptorType = USB_DT_INTERFACE,
125
126 .bNumEndpoints = 2,
127 .bInterfaceClass = USB_CLASS_CDC_DATA,
128 .bInterfaceSubClass = 0,
129 .bInterfaceProtocol = 0,
130
131};
132
133static struct usb_cdc_header_desc acm_header_desc = {
134 .bLength = sizeof(acm_header_desc),
135 .bDescriptorType = USB_DT_CS_INTERFACE,
136 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
137 .bcdCDC = cpu_to_le16(0x0110),
138};
139
140static struct usb_cdc_call_mgmt_descriptor
141acm_call_mgmt_descriptor = {
142 .bLength = sizeof(acm_call_mgmt_descriptor),
143 .bDescriptorType = USB_DT_CS_INTERFACE,
144 .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
145 .bmCapabilities = 0,
146
147};
148
149static struct usb_cdc_acm_descriptor acm_descriptor = {
150 .bLength = sizeof(acm_descriptor),
151 .bDescriptorType = USB_DT_CS_INTERFACE,
152 .bDescriptorSubType = USB_CDC_ACM_TYPE,
153 .bmCapabilities = USB_CDC_CAP_LINE,
154};
155
156static struct usb_cdc_union_desc acm_union_desc = {
157 .bLength = sizeof(acm_union_desc),
158 .bDescriptorType = USB_DT_CS_INTERFACE,
159 .bDescriptorSubType = USB_CDC_UNION_TYPE,
160
161
162};
163
164
165
166static struct usb_endpoint_descriptor acm_fs_notify_desc = {
167 .bLength = USB_DT_ENDPOINT_SIZE,
168 .bDescriptorType = USB_DT_ENDPOINT,
169 .bEndpointAddress = USB_DIR_IN,
170 .bmAttributes = USB_ENDPOINT_XFER_INT,
171 .wMaxPacketSize = cpu_to_le16(GS_NOTIFY_MAXPACKET),
172 .bInterval = GS_NOTIFY_INTERVAL_MS,
173};
174
175static struct usb_endpoint_descriptor acm_fs_in_desc = {
176 .bLength = USB_DT_ENDPOINT_SIZE,
177 .bDescriptorType = USB_DT_ENDPOINT,
178 .bEndpointAddress = USB_DIR_IN,
179 .bmAttributes = USB_ENDPOINT_XFER_BULK,
180};
181
182static struct usb_endpoint_descriptor acm_fs_out_desc = {
183 .bLength = USB_DT_ENDPOINT_SIZE,
184 .bDescriptorType = USB_DT_ENDPOINT,
185 .bEndpointAddress = USB_DIR_OUT,
186 .bmAttributes = USB_ENDPOINT_XFER_BULK,
187};
188
189static struct usb_descriptor_header *acm_fs_function[] = {
190 (struct usb_descriptor_header *) &acm_iad_descriptor,
191 (struct usb_descriptor_header *) &acm_control_interface_desc,
192 (struct usb_descriptor_header *) &acm_header_desc,
193 (struct usb_descriptor_header *) &acm_call_mgmt_descriptor,
194 (struct usb_descriptor_header *) &acm_descriptor,
195 (struct usb_descriptor_header *) &acm_union_desc,
196 (struct usb_descriptor_header *) &acm_fs_notify_desc,
197 (struct usb_descriptor_header *) &acm_data_interface_desc,
198 (struct usb_descriptor_header *) &acm_fs_in_desc,
199 (struct usb_descriptor_header *) &acm_fs_out_desc,
200 NULL,
201};
202
203
204static struct usb_endpoint_descriptor acm_hs_notify_desc = {
205 .bLength = USB_DT_ENDPOINT_SIZE,
206 .bDescriptorType = USB_DT_ENDPOINT,
207 .bEndpointAddress = USB_DIR_IN,
208 .bmAttributes = USB_ENDPOINT_XFER_INT,
209 .wMaxPacketSize = cpu_to_le16(GS_NOTIFY_MAXPACKET),
210 .bInterval = USB_MS_TO_HS_INTERVAL(GS_NOTIFY_INTERVAL_MS),
211};
212
213static struct usb_endpoint_descriptor acm_hs_in_desc = {
214 .bLength = USB_DT_ENDPOINT_SIZE,
215 .bDescriptorType = USB_DT_ENDPOINT,
216 .bmAttributes = USB_ENDPOINT_XFER_BULK,
217 .wMaxPacketSize = cpu_to_le16(512),
218};
219
220static struct usb_endpoint_descriptor acm_hs_out_desc = {
221 .bLength = USB_DT_ENDPOINT_SIZE,
222 .bDescriptorType = USB_DT_ENDPOINT,
223 .bmAttributes = USB_ENDPOINT_XFER_BULK,
224 .wMaxPacketSize = cpu_to_le16(512),
225};
226
227static struct usb_descriptor_header *acm_hs_function[] = {
228 (struct usb_descriptor_header *) &acm_iad_descriptor,
229 (struct usb_descriptor_header *) &acm_control_interface_desc,
230 (struct usb_descriptor_header *) &acm_header_desc,
231 (struct usb_descriptor_header *) &acm_call_mgmt_descriptor,
232 (struct usb_descriptor_header *) &acm_descriptor,
233 (struct usb_descriptor_header *) &acm_union_desc,
234 (struct usb_descriptor_header *) &acm_hs_notify_desc,
235 (struct usb_descriptor_header *) &acm_data_interface_desc,
236 (struct usb_descriptor_header *) &acm_hs_in_desc,
237 (struct usb_descriptor_header *) &acm_hs_out_desc,
238 NULL,
239};
240
241static struct usb_endpoint_descriptor acm_ss_in_desc = {
242 .bLength = USB_DT_ENDPOINT_SIZE,
243 .bDescriptorType = USB_DT_ENDPOINT,
244 .bmAttributes = USB_ENDPOINT_XFER_BULK,
245 .wMaxPacketSize = cpu_to_le16(1024),
246};
247
248static struct usb_endpoint_descriptor acm_ss_out_desc = {
249 .bLength = USB_DT_ENDPOINT_SIZE,
250 .bDescriptorType = USB_DT_ENDPOINT,
251 .bmAttributes = USB_ENDPOINT_XFER_BULK,
252 .wMaxPacketSize = cpu_to_le16(1024),
253};
254
255static struct usb_ss_ep_comp_descriptor acm_ss_bulk_comp_desc = {
256 .bLength = sizeof acm_ss_bulk_comp_desc,
257 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
258};
259
260static struct usb_descriptor_header *acm_ss_function[] = {
261 (struct usb_descriptor_header *) &acm_iad_descriptor,
262 (struct usb_descriptor_header *) &acm_control_interface_desc,
263 (struct usb_descriptor_header *) &acm_header_desc,
264 (struct usb_descriptor_header *) &acm_call_mgmt_descriptor,
265 (struct usb_descriptor_header *) &acm_descriptor,
266 (struct usb_descriptor_header *) &acm_union_desc,
267 (struct usb_descriptor_header *) &acm_hs_notify_desc,
268 (struct usb_descriptor_header *) &acm_ss_bulk_comp_desc,
269 (struct usb_descriptor_header *) &acm_data_interface_desc,
270 (struct usb_descriptor_header *) &acm_ss_in_desc,
271 (struct usb_descriptor_header *) &acm_ss_bulk_comp_desc,
272 (struct usb_descriptor_header *) &acm_ss_out_desc,
273 (struct usb_descriptor_header *) &acm_ss_bulk_comp_desc,
274 NULL,
275};
276
277
278
279#define ACM_CTRL_IDX 0
280#define ACM_DATA_IDX 1
281#define ACM_IAD_IDX 2
282
283
284static struct usb_string acm_string_defs[] = {
285 [ACM_CTRL_IDX].s = "CDC Abstract Control Model (ACM)",
286 [ACM_DATA_IDX].s = "CDC ACM Data",
287 [ACM_IAD_IDX ].s = "CDC Serial",
288};
289
290static struct usb_gadget_strings acm_string_table = {
291 .language = 0x0409,
292 .strings = acm_string_defs,
293};
294
295static struct usb_gadget_strings *acm_strings[] = {
296 &acm_string_table,
297 NULL,
298};
299
300
301
302
303
304
305
306
307
308static void acm_complete_set_line_coding(struct usb_ep *ep,
309 struct usb_request *req)
310{
311 struct f_acm *acm = ep->driver_data;
312 struct usb_composite_dev *cdev = acm->port.func.config->cdev;
313
314 if (req->status != 0) {
315 DBG(cdev, "acm ttyGS%d completion, err %d\n",
316 acm->port_num, req->status);
317 return;
318 }
319
320
321 if (req->actual != sizeof(acm->port_line_coding)) {
322 DBG(cdev, "acm ttyGS%d short resp, len %d\n",
323 acm->port_num, req->actual);
324 usb_ep_set_halt(ep);
325 } else {
326 struct usb_cdc_line_coding *value = req->buf;
327
328
329
330
331
332
333
334
335 acm->port_line_coding = *value;
336 }
337}
338
339static int acm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
340{
341 struct f_acm *acm = func_to_acm(f);
342 struct usb_composite_dev *cdev = f->config->cdev;
343 struct usb_request *req = cdev->req;
344 int value = -EOPNOTSUPP;
345 u16 w_index = le16_to_cpu(ctrl->wIndex);
346 u16 w_value = le16_to_cpu(ctrl->wValue);
347 u16 w_length = le16_to_cpu(ctrl->wLength);
348
349
350
351
352
353
354
355
356
357 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
358
359
360 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
361 | USB_CDC_REQ_SET_LINE_CODING:
362 if (w_length != sizeof(struct usb_cdc_line_coding)
363 || w_index != acm->ctrl_id)
364 goto invalid;
365
366 value = w_length;
367 cdev->gadget->ep0->driver_data = acm;
368 req->complete = acm_complete_set_line_coding;
369 break;
370
371
372 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
373 | USB_CDC_REQ_GET_LINE_CODING:
374 if (w_index != acm->ctrl_id)
375 goto invalid;
376
377 value = min_t(unsigned, w_length,
378 sizeof(struct usb_cdc_line_coding));
379 memcpy(req->buf, &acm->port_line_coding, value);
380 break;
381
382
383 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
384 | USB_CDC_REQ_SET_CONTROL_LINE_STATE:
385 if (w_index != acm->ctrl_id)
386 goto invalid;
387
388 value = 0;
389
390
391
392
393
394 acm->port_handshake_bits = w_value;
395 break;
396
397 default:
398invalid:
399 VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
400 ctrl->bRequestType, ctrl->bRequest,
401 w_value, w_index, w_length);
402 }
403
404
405 if (value >= 0) {
406 DBG(cdev, "acm ttyGS%d req%02x.%02x v%04x i%04x l%d\n",
407 acm->port_num, ctrl->bRequestType, ctrl->bRequest,
408 w_value, w_index, w_length);
409 req->zero = 0;
410 req->length = value;
411 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
412 if (value < 0)
413 ERROR(cdev, "acm response on ttyGS%d, err %d\n",
414 acm->port_num, value);
415 }
416
417
418 return value;
419}
420
421static int acm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
422{
423 struct f_acm *acm = func_to_acm(f);
424 struct usb_composite_dev *cdev = f->config->cdev;
425
426
427
428 if (intf == acm->ctrl_id) {
429 if (acm->notify->driver_data) {
430 VDBG(cdev, "reset acm control interface %d\n", intf);
431 usb_ep_disable(acm->notify);
432 } else {
433 VDBG(cdev, "init acm ctrl interface %d\n", intf);
434 if (config_ep_by_speed(cdev->gadget, f, acm->notify))
435 return -EINVAL;
436 }
437 usb_ep_enable(acm->notify);
438 acm->notify->driver_data = acm;
439
440 } else if (intf == acm->data_id) {
441 if (acm->port.in->driver_data) {
442 DBG(cdev, "reset acm ttyGS%d\n", acm->port_num);
443 gserial_disconnect(&acm->port);
444 }
445 if (!acm->port.in->desc || !acm->port.out->desc) {
446 DBG(cdev, "activate acm ttyGS%d\n", acm->port_num);
447 if (config_ep_by_speed(cdev->gadget, f,
448 acm->port.in) ||
449 config_ep_by_speed(cdev->gadget, f,
450 acm->port.out)) {
451 acm->port.in->desc = NULL;
452 acm->port.out->desc = NULL;
453 return -EINVAL;
454 }
455 }
456 gserial_connect(&acm->port, acm->port_num);
457
458 } else
459 return -EINVAL;
460
461 return 0;
462}
463
464static void acm_disable(struct usb_function *f)
465{
466 struct f_acm *acm = func_to_acm(f);
467 struct usb_composite_dev *cdev = f->config->cdev;
468
469 DBG(cdev, "acm ttyGS%d deactivated\n", acm->port_num);
470 gserial_disconnect(&acm->port);
471 usb_ep_disable(acm->notify);
472 acm->notify->driver_data = NULL;
473}
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491static int acm_cdc_notify(struct f_acm *acm, u8 type, u16 value,
492 void *data, unsigned length)
493{
494 struct usb_ep *ep = acm->notify;
495 struct usb_request *req;
496 struct usb_cdc_notification *notify;
497 const unsigned len = sizeof(*notify) + length;
498 void *buf;
499 int status;
500
501 req = acm->notify_req;
502 acm->notify_req = NULL;
503 acm->pending = false;
504
505 req->length = len;
506 notify = req->buf;
507 buf = notify + 1;
508
509 notify->bmRequestType = USB_DIR_IN | USB_TYPE_CLASS
510 | USB_RECIP_INTERFACE;
511 notify->bNotificationType = type;
512 notify->wValue = cpu_to_le16(value);
513 notify->wIndex = cpu_to_le16(acm->ctrl_id);
514 notify->wLength = cpu_to_le16(length);
515 memcpy(buf, data, length);
516
517
518 spin_unlock(&acm->lock);
519 status = usb_ep_queue(ep, req, GFP_ATOMIC);
520 spin_lock(&acm->lock);
521
522 if (status < 0) {
523 ERROR(acm->port.func.config->cdev,
524 "acm ttyGS%d can't notify serial state, %d\n",
525 acm->port_num, status);
526 acm->notify_req = req;
527 }
528
529 return status;
530}
531
532static int acm_notify_serial_state(struct f_acm *acm)
533{
534 struct usb_composite_dev *cdev = acm->port.func.config->cdev;
535 int status;
536
537 spin_lock(&acm->lock);
538 if (acm->notify_req) {
539 DBG(cdev, "acm ttyGS%d serial state %04x\n",
540 acm->port_num, acm->serial_state);
541 status = acm_cdc_notify(acm, USB_CDC_NOTIFY_SERIAL_STATE,
542 0, &acm->serial_state, sizeof(acm->serial_state));
543 } else {
544 acm->pending = true;
545 status = 0;
546 }
547 spin_unlock(&acm->lock);
548 return status;
549}
550
551static void acm_cdc_notify_complete(struct usb_ep *ep, struct usb_request *req)
552{
553 struct f_acm *acm = req->context;
554 u8 doit = false;
555
556
557
558
559 spin_lock(&acm->lock);
560 if (req->status != -ESHUTDOWN)
561 doit = acm->pending;
562 acm->notify_req = req;
563 spin_unlock(&acm->lock);
564
565 if (doit)
566 acm_notify_serial_state(acm);
567}
568
569
570
571static void acm_connect(struct gserial *port)
572{
573 struct f_acm *acm = port_to_acm(port);
574
575 acm->serial_state |= ACM_CTRL_DSR | ACM_CTRL_DCD;
576 acm_notify_serial_state(acm);
577}
578
579static void acm_disconnect(struct gserial *port)
580{
581 struct f_acm *acm = port_to_acm(port);
582
583 acm->serial_state &= ~(ACM_CTRL_DSR | ACM_CTRL_DCD);
584 acm_notify_serial_state(acm);
585}
586
587static int acm_send_break(struct gserial *port, int duration)
588{
589 struct f_acm *acm = port_to_acm(port);
590 u16 state;
591
592 state = acm->serial_state;
593 state &= ~ACM_CTRL_BRK;
594 if (duration)
595 state |= ACM_CTRL_BRK;
596
597 acm->serial_state = state;
598 return acm_notify_serial_state(acm);
599}
600
601
602
603
604static int
605acm_bind(struct usb_configuration *c, struct usb_function *f)
606{
607 struct usb_composite_dev *cdev = c->cdev;
608 struct f_acm *acm = func_to_acm(f);
609 struct usb_string *us;
610 int status;
611 struct usb_ep *ep;
612
613
614
615
616
617
618 us = usb_gstrings_attach(cdev, acm_strings,
619 ARRAY_SIZE(acm_string_defs));
620 if (IS_ERR(us))
621 return PTR_ERR(us);
622 acm_control_interface_desc.iInterface = us[ACM_CTRL_IDX].id;
623 acm_data_interface_desc.iInterface = us[ACM_DATA_IDX].id;
624 acm_iad_descriptor.iFunction = us[ACM_IAD_IDX].id;
625
626
627 status = usb_interface_id(c, f);
628 if (status < 0)
629 goto fail;
630 acm->ctrl_id = status;
631 acm_iad_descriptor.bFirstInterface = status;
632
633 acm_control_interface_desc.bInterfaceNumber = status;
634 acm_union_desc .bMasterInterface0 = status;
635
636 status = usb_interface_id(c, f);
637 if (status < 0)
638 goto fail;
639 acm->data_id = status;
640
641 acm_data_interface_desc.bInterfaceNumber = status;
642 acm_union_desc.bSlaveInterface0 = status;
643 acm_call_mgmt_descriptor.bDataInterface = status;
644
645 status = -ENODEV;
646
647
648 ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_in_desc);
649 if (!ep)
650 goto fail;
651 acm->port.in = ep;
652 ep->driver_data = cdev;
653
654 ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_out_desc);
655 if (!ep)
656 goto fail;
657 acm->port.out = ep;
658 ep->driver_data = cdev;
659
660 ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_notify_desc);
661 if (!ep)
662 goto fail;
663 acm->notify = ep;
664 ep->driver_data = cdev;
665
666
667 acm->notify_req = gs_alloc_req(ep,
668 sizeof(struct usb_cdc_notification) + 2,
669 GFP_KERNEL);
670 if (!acm->notify_req)
671 goto fail;
672
673 acm->notify_req->complete = acm_cdc_notify_complete;
674 acm->notify_req->context = acm;
675
676
677
678
679
680 acm_hs_in_desc.bEndpointAddress = acm_fs_in_desc.bEndpointAddress;
681 acm_hs_out_desc.bEndpointAddress = acm_fs_out_desc.bEndpointAddress;
682 acm_hs_notify_desc.bEndpointAddress =
683 acm_fs_notify_desc.bEndpointAddress;
684
685 acm_ss_in_desc.bEndpointAddress = acm_fs_in_desc.bEndpointAddress;
686 acm_ss_out_desc.bEndpointAddress = acm_fs_out_desc.bEndpointAddress;
687
688 status = usb_assign_descriptors(f, acm_fs_function, acm_hs_function,
689 acm_ss_function);
690 if (status)
691 goto fail;
692
693 DBG(cdev, "acm ttyGS%d: %s speed IN/%s OUT/%s NOTIFY/%s\n",
694 acm->port_num,
695 gadget_is_superspeed(c->cdev->gadget) ? "super" :
696 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
697 acm->port.in->name, acm->port.out->name,
698 acm->notify->name);
699 return 0;
700
701fail:
702 if (acm->notify_req)
703 gs_free_req(acm->notify, acm->notify_req);
704
705
706 if (acm->notify)
707 acm->notify->driver_data = NULL;
708 if (acm->port.out)
709 acm->port.out->driver_data = NULL;
710 if (acm->port.in)
711 acm->port.in->driver_data = NULL;
712
713 ERROR(cdev, "%s/%p: can't bind, err %d\n", f->name, f, status);
714
715 return status;
716}
717
718static void acm_unbind(struct usb_configuration *c, struct usb_function *f)
719{
720 struct f_acm *acm = func_to_acm(f);
721
722 acm_string_defs[0].id = 0;
723 usb_free_all_descriptors(f);
724 if (acm->notify_req)
725 gs_free_req(acm->notify, acm->notify_req);
726}
727
728static void acm_free_func(struct usb_function *f)
729{
730 struct f_acm *acm = func_to_acm(f);
731
732 kfree(acm);
733}
734
735static struct usb_function *acm_alloc_func(struct usb_function_instance *fi)
736{
737 struct f_serial_opts *opts;
738 struct f_acm *acm;
739
740 acm = kzalloc(sizeof(*acm), GFP_KERNEL);
741 if (!acm)
742 return ERR_PTR(-ENOMEM);
743
744 spin_lock_init(&acm->lock);
745
746 acm->port.connect = acm_connect;
747 acm->port.disconnect = acm_disconnect;
748 acm->port.send_break = acm_send_break;
749
750 acm->port.func.name = "acm";
751 acm->port.func.strings = acm_strings;
752
753 acm->port.func.bind = acm_bind;
754 acm->port.func.set_alt = acm_set_alt;
755 acm->port.func.setup = acm_setup;
756 acm->port.func.disable = acm_disable;
757
758 opts = container_of(fi, struct f_serial_opts, func_inst);
759 acm->port_num = opts->port_num;
760 acm->port.func.unbind = acm_unbind;
761 acm->port.func.free_func = acm_free_func;
762
763 return &acm->port.func;
764}
765
766static inline struct f_serial_opts *to_f_serial_opts(struct config_item *item)
767{
768 return container_of(to_config_group(item), struct f_serial_opts,
769 func_inst.group);
770}
771
772CONFIGFS_ATTR_STRUCT(f_serial_opts);
773static ssize_t f_acm_attr_show(struct config_item *item,
774 struct configfs_attribute *attr,
775 char *page)
776{
777 struct f_serial_opts *opts = to_f_serial_opts(item);
778 struct f_serial_opts_attribute *f_serial_opts_attr =
779 container_of(attr, struct f_serial_opts_attribute, attr);
780 ssize_t ret = 0;
781
782 if (f_serial_opts_attr->show)
783 ret = f_serial_opts_attr->show(opts, page);
784 return ret;
785}
786
787static void acm_attr_release(struct config_item *item)
788{
789 struct f_serial_opts *opts = to_f_serial_opts(item);
790
791 usb_put_function_instance(&opts->func_inst);
792}
793
794static struct configfs_item_operations acm_item_ops = {
795 .release = acm_attr_release,
796 .show_attribute = f_acm_attr_show,
797};
798
799static ssize_t f_acm_port_num_show(struct f_serial_opts *opts, char *page)
800{
801 return sprintf(page, "%u\n", opts->port_num);
802}
803
804static struct f_serial_opts_attribute f_acm_port_num =
805 __CONFIGFS_ATTR_RO(port_num, f_acm_port_num_show);
806
807
808static struct configfs_attribute *acm_attrs[] = {
809 &f_acm_port_num.attr,
810 NULL,
811};
812
813static struct config_item_type acm_func_type = {
814 .ct_item_ops = &acm_item_ops,
815 .ct_attrs = acm_attrs,
816 .ct_owner = THIS_MODULE,
817};
818
819static void acm_free_instance(struct usb_function_instance *fi)
820{
821 struct f_serial_opts *opts;
822
823 opts = container_of(fi, struct f_serial_opts, func_inst);
824 gserial_free_line(opts->port_num);
825 kfree(opts);
826}
827
828static struct usb_function_instance *acm_alloc_instance(void)
829{
830 struct f_serial_opts *opts;
831 int ret;
832
833 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
834 if (!opts)
835 return ERR_PTR(-ENOMEM);
836 opts->func_inst.free_func_inst = acm_free_instance;
837 ret = gserial_alloc_line(&opts->port_num);
838 if (ret) {
839 kfree(opts);
840 return ERR_PTR(ret);
841 }
842 config_group_init_type_name(&opts->func_inst.group, "",
843 &acm_func_type);
844 return &opts->func_inst;
845}
846DECLARE_USB_FUNCTION_INIT(acm, acm_alloc_instance, acm_alloc_func);
847MODULE_LICENSE("GPL");
848