Commit | Line | Data |
---|---|---|
4d5a73dc DB |
1 | /* |
2 | * f_acm.c -- USB CDC serial (ACM) function driver | |
3 | * | |
4 | * Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com) | |
5 | * Copyright (C) 2008 by David Brownell | |
6 | * Copyright (C) 2008 by Nokia Corporation | |
b97503ff | 7 | * Copyright (C) 2009 by Samsung Electronics |
54b8360f | 8 | * Author: Michal Nazarewicz (mina86@mina86.com) |
4d5a73dc DB |
9 | * |
10 | * This software is distributed under the terms of the GNU General | |
11 | * Public License ("GPL") as published by the Free Software Foundation, | |
12 | * either version 2 of that License or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | /* #define VERBOSE_DEBUG */ | |
16 | ||
5a0e3ad6 | 17 | #include <linux/slab.h> |
4d5a73dc DB |
18 | #include <linux/kernel.h> |
19 | #include <linux/device.h> | |
20 | ||
21 | #include "u_serial.h" | |
22 | #include "gadget_chips.h" | |
23 | ||
24 | ||
25 | /* | |
26 | * This CDC ACM function support just wraps control functions and | |
27 | * notifications around the generic serial-over-usb code. | |
28 | * | |
29 | * Because CDC ACM is standardized by the USB-IF, many host operating | |
30 | * systems have drivers for it. Accordingly, ACM is the preferred | |
31 | * interop solution for serial-port type connections. The control | |
32 | * models are often not necessary, and in any case don't do much in | |
33 | * this bare-bones implementation. | |
34 | * | |
35 | * Note that even MS-Windows has some support for ACM. However, that | |
36 | * support is somewhat broken because when you use ACM in a composite | |
37 | * device, having multiple interfaces confuses the poor OS. It doesn't | |
38 | * seem to understand CDC Union descriptors. The new "association" | |
39 | * descriptors (roughly equivalent to CDC Unions) may sometimes help. | |
40 | */ | |
41 | ||
4d5a73dc DB |
42 | struct f_acm { |
43 | struct gserial port; | |
44 | u8 ctrl_id, data_id; | |
45 | u8 port_num; | |
46 | ||
1f1ba11b DB |
47 | u8 pending; |
48 | ||
49 | /* lock is mostly for pending and notify_req ... they get accessed | |
50 | * by callbacks both from tty (open/close/break) under its spinlock, | |
51 | * and notify_req.complete() which can't use that lock. | |
52 | */ | |
53 | spinlock_t lock; | |
54 | ||
4d5a73dc | 55 | struct usb_ep *notify; |
1f1ba11b | 56 | struct usb_request *notify_req; |
4d5a73dc DB |
57 | |
58 | struct usb_cdc_line_coding port_line_coding; /* 8-N-1 etc */ | |
1f1ba11b DB |
59 | |
60 | /* SetControlLineState request -- CDC 1.1 section 6.2.14 (INPUT) */ | |
4d5a73dc | 61 | u16 port_handshake_bits; |
1f1ba11b DB |
62 | #define ACM_CTRL_RTS (1 << 1) /* unused with full duplex */ |
63 | #define ACM_CTRL_DTR (1 << 0) /* host is ready for data r/w */ | |
64 | ||
65 | /* SerialState notification -- CDC 1.1 section 6.3.5 (OUTPUT) */ | |
66 | u16 serial_state; | |
67 | #define ACM_CTRL_OVERRUN (1 << 6) | |
68 | #define ACM_CTRL_PARITY (1 << 5) | |
69 | #define ACM_CTRL_FRAMING (1 << 4) | |
70 | #define ACM_CTRL_RI (1 << 3) | |
71 | #define ACM_CTRL_BRK (1 << 2) | |
72 | #define ACM_CTRL_DSR (1 << 1) | |
73 | #define ACM_CTRL_DCD (1 << 0) | |
4d5a73dc DB |
74 | }; |
75 | ||
76 | static inline struct f_acm *func_to_acm(struct usb_function *f) | |
77 | { | |
78 | return container_of(f, struct f_acm, port.func); | |
79 | } | |
80 | ||
1f1ba11b DB |
81 | static inline struct f_acm *port_to_acm(struct gserial *p) |
82 | { | |
83 | return container_of(p, struct f_acm, port); | |
84 | } | |
85 | ||
4d5a73dc DB |
86 | /*-------------------------------------------------------------------------*/ |
87 | ||
88 | /* notification endpoint uses smallish and infrequent fixed-size messages */ | |
89 | ||
bcb2f99c | 90 | #define GS_NOTIFY_INTERVAL_MS 32 |
1f1ba11b | 91 | #define GS_NOTIFY_MAXPACKET 10 /* notification + 2 bytes */ |
4d5a73dc DB |
92 | |
93 | /* interface and class descriptors: */ | |
94 | ||
b97503ff MN |
95 | static struct usb_interface_assoc_descriptor |
96 | acm_iad_descriptor = { | |
97 | .bLength = sizeof acm_iad_descriptor, | |
98 | .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, | |
99 | ||
100 | /* .bFirstInterface = DYNAMIC, */ | |
101 | .bInterfaceCount = 2, // control + data | |
102 | .bFunctionClass = USB_CLASS_COMM, | |
103 | .bFunctionSubClass = USB_CDC_SUBCLASS_ACM, | |
5c8db070 | 104 | .bFunctionProtocol = USB_CDC_ACM_PROTO_AT_V25TER, |
b97503ff MN |
105 | /* .iFunction = DYNAMIC */ |
106 | }; | |
107 | ||
108 | ||
28824b18 | 109 | static struct usb_interface_descriptor acm_control_interface_desc = { |
4d5a73dc DB |
110 | .bLength = USB_DT_INTERFACE_SIZE, |
111 | .bDescriptorType = USB_DT_INTERFACE, | |
112 | /* .bInterfaceNumber = DYNAMIC */ | |
113 | .bNumEndpoints = 1, | |
114 | .bInterfaceClass = USB_CLASS_COMM, | |
115 | .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM, | |
116 | .bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER, | |
117 | /* .iInterface = DYNAMIC */ | |
118 | }; | |
119 | ||
28824b18 | 120 | static struct usb_interface_descriptor acm_data_interface_desc = { |
4d5a73dc DB |
121 | .bLength = USB_DT_INTERFACE_SIZE, |
122 | .bDescriptorType = USB_DT_INTERFACE, | |
123 | /* .bInterfaceNumber = DYNAMIC */ | |
124 | .bNumEndpoints = 2, | |
125 | .bInterfaceClass = USB_CLASS_CDC_DATA, | |
126 | .bInterfaceSubClass = 0, | |
127 | .bInterfaceProtocol = 0, | |
128 | /* .iInterface = DYNAMIC */ | |
129 | }; | |
130 | ||
28824b18 | 131 | static struct usb_cdc_header_desc acm_header_desc = { |
4d5a73dc DB |
132 | .bLength = sizeof(acm_header_desc), |
133 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
134 | .bDescriptorSubType = USB_CDC_HEADER_TYPE, | |
551509d2 | 135 | .bcdCDC = cpu_to_le16(0x0110), |
4d5a73dc DB |
136 | }; |
137 | ||
138 | static struct usb_cdc_call_mgmt_descriptor | |
28824b18 | 139 | acm_call_mgmt_descriptor = { |
4d5a73dc DB |
140 | .bLength = sizeof(acm_call_mgmt_descriptor), |
141 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
142 | .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE, | |
143 | .bmCapabilities = 0, | |
144 | /* .bDataInterface = DYNAMIC */ | |
145 | }; | |
146 | ||
28824b18 | 147 | static struct usb_cdc_acm_descriptor acm_descriptor = { |
4d5a73dc DB |
148 | .bLength = sizeof(acm_descriptor), |
149 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
150 | .bDescriptorSubType = USB_CDC_ACM_TYPE, | |
1f1ba11b | 151 | .bmCapabilities = USB_CDC_CAP_LINE, |
4d5a73dc DB |
152 | }; |
153 | ||
28824b18 | 154 | static struct usb_cdc_union_desc acm_union_desc = { |
4d5a73dc DB |
155 | .bLength = sizeof(acm_union_desc), |
156 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
157 | .bDescriptorSubType = USB_CDC_UNION_TYPE, | |
158 | /* .bMasterInterface0 = DYNAMIC */ | |
159 | /* .bSlaveInterface0 = DYNAMIC */ | |
160 | }; | |
161 | ||
162 | /* full speed support: */ | |
163 | ||
28824b18 | 164 | static struct usb_endpoint_descriptor acm_fs_notify_desc = { |
4d5a73dc DB |
165 | .bLength = USB_DT_ENDPOINT_SIZE, |
166 | .bDescriptorType = USB_DT_ENDPOINT, | |
167 | .bEndpointAddress = USB_DIR_IN, | |
168 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 169 | .wMaxPacketSize = cpu_to_le16(GS_NOTIFY_MAXPACKET), |
bcb2f99c | 170 | .bInterval = GS_NOTIFY_INTERVAL_MS, |
4d5a73dc DB |
171 | }; |
172 | ||
28824b18 | 173 | static struct usb_endpoint_descriptor acm_fs_in_desc = { |
4d5a73dc DB |
174 | .bLength = USB_DT_ENDPOINT_SIZE, |
175 | .bDescriptorType = USB_DT_ENDPOINT, | |
176 | .bEndpointAddress = USB_DIR_IN, | |
177 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
178 | }; | |
179 | ||
28824b18 | 180 | static struct usb_endpoint_descriptor acm_fs_out_desc = { |
4d5a73dc DB |
181 | .bLength = USB_DT_ENDPOINT_SIZE, |
182 | .bDescriptorType = USB_DT_ENDPOINT, | |
183 | .bEndpointAddress = USB_DIR_OUT, | |
184 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
185 | }; | |
186 | ||
28824b18 | 187 | static struct usb_descriptor_header *acm_fs_function[] = { |
b97503ff | 188 | (struct usb_descriptor_header *) &acm_iad_descriptor, |
4d5a73dc DB |
189 | (struct usb_descriptor_header *) &acm_control_interface_desc, |
190 | (struct usb_descriptor_header *) &acm_header_desc, | |
191 | (struct usb_descriptor_header *) &acm_call_mgmt_descriptor, | |
192 | (struct usb_descriptor_header *) &acm_descriptor, | |
193 | (struct usb_descriptor_header *) &acm_union_desc, | |
194 | (struct usb_descriptor_header *) &acm_fs_notify_desc, | |
195 | (struct usb_descriptor_header *) &acm_data_interface_desc, | |
196 | (struct usb_descriptor_header *) &acm_fs_in_desc, | |
197 | (struct usb_descriptor_header *) &acm_fs_out_desc, | |
198 | NULL, | |
199 | }; | |
200 | ||
201 | /* high speed support: */ | |
28824b18 | 202 | static struct usb_endpoint_descriptor acm_hs_notify_desc = { |
4d5a73dc DB |
203 | .bLength = USB_DT_ENDPOINT_SIZE, |
204 | .bDescriptorType = USB_DT_ENDPOINT, | |
205 | .bEndpointAddress = USB_DIR_IN, | |
206 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
551509d2 | 207 | .wMaxPacketSize = cpu_to_le16(GS_NOTIFY_MAXPACKET), |
bcb2f99c | 208 | .bInterval = USB_MS_TO_HS_INTERVAL(GS_NOTIFY_INTERVAL_MS), |
4d5a73dc DB |
209 | }; |
210 | ||
28824b18 | 211 | static struct usb_endpoint_descriptor acm_hs_in_desc = { |
4d5a73dc DB |
212 | .bLength = USB_DT_ENDPOINT_SIZE, |
213 | .bDescriptorType = USB_DT_ENDPOINT, | |
214 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 215 | .wMaxPacketSize = cpu_to_le16(512), |
4d5a73dc DB |
216 | }; |
217 | ||
28824b18 | 218 | static struct usb_endpoint_descriptor acm_hs_out_desc = { |
4d5a73dc DB |
219 | .bLength = USB_DT_ENDPOINT_SIZE, |
220 | .bDescriptorType = USB_DT_ENDPOINT, | |
221 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 222 | .wMaxPacketSize = cpu_to_le16(512), |
4d5a73dc DB |
223 | }; |
224 | ||
28824b18 | 225 | static struct usb_descriptor_header *acm_hs_function[] = { |
b97503ff | 226 | (struct usb_descriptor_header *) &acm_iad_descriptor, |
4d5a73dc DB |
227 | (struct usb_descriptor_header *) &acm_control_interface_desc, |
228 | (struct usb_descriptor_header *) &acm_header_desc, | |
229 | (struct usb_descriptor_header *) &acm_call_mgmt_descriptor, | |
230 | (struct usb_descriptor_header *) &acm_descriptor, | |
231 | (struct usb_descriptor_header *) &acm_union_desc, | |
232 | (struct usb_descriptor_header *) &acm_hs_notify_desc, | |
233 | (struct usb_descriptor_header *) &acm_data_interface_desc, | |
234 | (struct usb_descriptor_header *) &acm_hs_in_desc, | |
235 | (struct usb_descriptor_header *) &acm_hs_out_desc, | |
236 | NULL, | |
237 | }; | |
238 | ||
6fecfb05 SAS |
239 | static struct usb_endpoint_descriptor acm_ss_in_desc = { |
240 | .bLength = USB_DT_ENDPOINT_SIZE, | |
241 | .bDescriptorType = USB_DT_ENDPOINT, | |
242 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
243 | .wMaxPacketSize = cpu_to_le16(1024), | |
244 | }; | |
245 | ||
246 | static struct usb_endpoint_descriptor acm_ss_out_desc = { | |
247 | .bLength = USB_DT_ENDPOINT_SIZE, | |
248 | .bDescriptorType = USB_DT_ENDPOINT, | |
249 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
250 | .wMaxPacketSize = cpu_to_le16(1024), | |
251 | }; | |
252 | ||
253 | static struct usb_ss_ep_comp_descriptor acm_ss_bulk_comp_desc = { | |
254 | .bLength = sizeof acm_ss_bulk_comp_desc, | |
255 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
256 | }; | |
257 | ||
258 | static struct usb_descriptor_header *acm_ss_function[] = { | |
259 | (struct usb_descriptor_header *) &acm_iad_descriptor, | |
260 | (struct usb_descriptor_header *) &acm_control_interface_desc, | |
261 | (struct usb_descriptor_header *) &acm_header_desc, | |
262 | (struct usb_descriptor_header *) &acm_call_mgmt_descriptor, | |
263 | (struct usb_descriptor_header *) &acm_descriptor, | |
264 | (struct usb_descriptor_header *) &acm_union_desc, | |
265 | (struct usb_descriptor_header *) &acm_hs_notify_desc, | |
266 | (struct usb_descriptor_header *) &acm_ss_bulk_comp_desc, | |
267 | (struct usb_descriptor_header *) &acm_data_interface_desc, | |
268 | (struct usb_descriptor_header *) &acm_ss_in_desc, | |
269 | (struct usb_descriptor_header *) &acm_ss_bulk_comp_desc, | |
270 | (struct usb_descriptor_header *) &acm_ss_out_desc, | |
271 | (struct usb_descriptor_header *) &acm_ss_bulk_comp_desc, | |
272 | NULL, | |
273 | }; | |
274 | ||
4d5a73dc DB |
275 | /* string descriptors: */ |
276 | ||
277 | #define ACM_CTRL_IDX 0 | |
278 | #define ACM_DATA_IDX 1 | |
b97503ff | 279 | #define ACM_IAD_IDX 2 |
4d5a73dc DB |
280 | |
281 | /* static strings, in UTF-8 */ | |
282 | static struct usb_string acm_string_defs[] = { | |
283 | [ACM_CTRL_IDX].s = "CDC Abstract Control Model (ACM)", | |
284 | [ACM_DATA_IDX].s = "CDC ACM Data", | |
b97503ff | 285 | [ACM_IAD_IDX ].s = "CDC Serial", |
4d5a73dc DB |
286 | { /* ZEROES END LIST */ }, |
287 | }; | |
288 | ||
289 | static struct usb_gadget_strings acm_string_table = { | |
290 | .language = 0x0409, /* en-us */ | |
291 | .strings = acm_string_defs, | |
292 | }; | |
293 | ||
294 | static struct usb_gadget_strings *acm_strings[] = { | |
295 | &acm_string_table, | |
296 | NULL, | |
297 | }; | |
298 | ||
299 | /*-------------------------------------------------------------------------*/ | |
300 | ||
301 | /* ACM control ... data handling is delegated to tty library code. | |
302 | * The main task of this function is to activate and deactivate | |
303 | * that code based on device state; track parameters like line | |
304 | * speed, handshake state, and so on; and issue notifications. | |
305 | */ | |
306 | ||
307 | static void acm_complete_set_line_coding(struct usb_ep *ep, | |
308 | struct usb_request *req) | |
309 | { | |
310 | struct f_acm *acm = ep->driver_data; | |
311 | struct usb_composite_dev *cdev = acm->port.func.config->cdev; | |
312 | ||
313 | if (req->status != 0) { | |
314 | DBG(cdev, "acm ttyGS%d completion, err %d\n", | |
315 | acm->port_num, req->status); | |
316 | return; | |
317 | } | |
318 | ||
319 | /* normal completion */ | |
320 | if (req->actual != sizeof(acm->port_line_coding)) { | |
321 | DBG(cdev, "acm ttyGS%d short resp, len %d\n", | |
322 | acm->port_num, req->actual); | |
323 | usb_ep_set_halt(ep); | |
324 | } else { | |
325 | struct usb_cdc_line_coding *value = req->buf; | |
326 | ||
327 | /* REVISIT: we currently just remember this data. | |
328 | * If we change that, (a) validate it first, then | |
329 | * (b) update whatever hardware needs updating, | |
330 | * (c) worry about locking. This is information on | |
331 | * the order of 9600-8-N-1 ... most of which means | |
332 | * nothing unless we control a real RS232 line. | |
333 | */ | |
334 | acm->port_line_coding = *value; | |
335 | } | |
336 | } | |
337 | ||
338 | static int acm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) | |
339 | { | |
340 | struct f_acm *acm = func_to_acm(f); | |
341 | struct usb_composite_dev *cdev = f->config->cdev; | |
342 | struct usb_request *req = cdev->req; | |
343 | int value = -EOPNOTSUPP; | |
344 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
345 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
346 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
347 | ||
348 | /* composite driver infrastructure handles everything except | |
349 | * CDC class messages; interface activation uses set_alt(). | |
1f1ba11b DB |
350 | * |
351 | * Note CDC spec table 4 lists the ACM request profile. It requires | |
352 | * encapsulated command support ... we don't handle any, and respond | |
353 | * to them by stalling. Options include get/set/clear comm features | |
354 | * (not that useful) and SEND_BREAK. | |
4d5a73dc DB |
355 | */ |
356 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
357 | ||
358 | /* SET_LINE_CODING ... just read and save what the host sends */ | |
359 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | |
360 | | USB_CDC_REQ_SET_LINE_CODING: | |
361 | if (w_length != sizeof(struct usb_cdc_line_coding) | |
362 | || w_index != acm->ctrl_id) | |
363 | goto invalid; | |
364 | ||
365 | value = w_length; | |
366 | cdev->gadget->ep0->driver_data = acm; | |
367 | req->complete = acm_complete_set_line_coding; | |
368 | break; | |
369 | ||
370 | /* GET_LINE_CODING ... return what host sent, or initial value */ | |
371 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | |
372 | | USB_CDC_REQ_GET_LINE_CODING: | |
373 | if (w_index != acm->ctrl_id) | |
374 | goto invalid; | |
375 | ||
376 | value = min_t(unsigned, w_length, | |
377 | sizeof(struct usb_cdc_line_coding)); | |
378 | memcpy(req->buf, &acm->port_line_coding, value); | |
379 | break; | |
380 | ||
381 | /* SET_CONTROL_LINE_STATE ... save what the host sent */ | |
382 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | |
383 | | USB_CDC_REQ_SET_CONTROL_LINE_STATE: | |
384 | if (w_index != acm->ctrl_id) | |
385 | goto invalid; | |
386 | ||
387 | value = 0; | |
388 | ||
389 | /* FIXME we should not allow data to flow until the | |
1f1ba11b | 390 | * host sets the ACM_CTRL_DTR bit; and when it clears |
4d5a73dc DB |
391 | * that bit, we should return to that no-flow state. |
392 | */ | |
393 | acm->port_handshake_bits = w_value; | |
394 | break; | |
395 | ||
396 | default: | |
397 | invalid: | |
398 | VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", | |
399 | ctrl->bRequestType, ctrl->bRequest, | |
400 | w_value, w_index, w_length); | |
401 | } | |
402 | ||
403 | /* respond with data transfer or status phase? */ | |
404 | if (value >= 0) { | |
405 | DBG(cdev, "acm ttyGS%d req%02x.%02x v%04x i%04x l%d\n", | |
406 | acm->port_num, ctrl->bRequestType, ctrl->bRequest, | |
407 | w_value, w_index, w_length); | |
408 | req->zero = 0; | |
409 | req->length = value; | |
410 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
411 | if (value < 0) | |
412 | ERROR(cdev, "acm response on ttyGS%d, err %d\n", | |
413 | acm->port_num, value); | |
414 | } | |
415 | ||
416 | /* device either stalls (value < 0) or reports success */ | |
417 | return value; | |
418 | } | |
419 | ||
420 | static int acm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
421 | { | |
422 | struct f_acm *acm = func_to_acm(f); | |
423 | struct usb_composite_dev *cdev = f->config->cdev; | |
424 | ||
425 | /* we know alt == 0, so this is an activation or a reset */ | |
426 | ||
427 | if (intf == acm->ctrl_id) { | |
4d5a73dc DB |
428 | if (acm->notify->driver_data) { |
429 | VDBG(cdev, "reset acm control interface %d\n", intf); | |
430 | usb_ep_disable(acm->notify); | |
431 | } else { | |
432 | VDBG(cdev, "init acm ctrl interface %d\n", intf); | |
ea2a1df7 TB |
433 | if (config_ep_by_speed(cdev->gadget, f, acm->notify)) |
434 | return -EINVAL; | |
4d5a73dc | 435 | } |
72c973dd | 436 | usb_ep_enable(acm->notify); |
4d5a73dc DB |
437 | acm->notify->driver_data = acm; |
438 | ||
439 | } else if (intf == acm->data_id) { | |
440 | if (acm->port.in->driver_data) { | |
441 | DBG(cdev, "reset acm ttyGS%d\n", acm->port_num); | |
442 | gserial_disconnect(&acm->port); | |
ea2a1df7 TB |
443 | } |
444 | if (!acm->port.in->desc || !acm->port.out->desc) { | |
4d5a73dc | 445 | DBG(cdev, "activate acm ttyGS%d\n", acm->port_num); |
ea2a1df7 TB |
446 | if (config_ep_by_speed(cdev->gadget, f, |
447 | acm->port.in) || | |
448 | config_ep_by_speed(cdev->gadget, f, | |
449 | acm->port.out)) { | |
450 | acm->port.in->desc = NULL; | |
451 | acm->port.out->desc = NULL; | |
452 | return -EINVAL; | |
453 | } | |
4d5a73dc DB |
454 | } |
455 | gserial_connect(&acm->port, acm->port_num); | |
456 | ||
457 | } else | |
458 | return -EINVAL; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | static void acm_disable(struct usb_function *f) | |
464 | { | |
465 | struct f_acm *acm = func_to_acm(f); | |
466 | struct usb_composite_dev *cdev = f->config->cdev; | |
467 | ||
468 | DBG(cdev, "acm ttyGS%d deactivated\n", acm->port_num); | |
469 | gserial_disconnect(&acm->port); | |
470 | usb_ep_disable(acm->notify); | |
471 | acm->notify->driver_data = NULL; | |
472 | } | |
473 | ||
474 | /*-------------------------------------------------------------------------*/ | |
475 | ||
1f1ba11b DB |
476 | /** |
477 | * acm_cdc_notify - issue CDC notification to host | |
478 | * @acm: wraps host to be notified | |
479 | * @type: notification type | |
480 | * @value: Refer to cdc specs, wValue field. | |
481 | * @data: data to be sent | |
482 | * @length: size of data | |
483 | * Context: irqs blocked, acm->lock held, acm_notify_req non-null | |
484 | * | |
af901ca1 | 485 | * Returns zero on success or a negative errno. |
1f1ba11b DB |
486 | * |
487 | * See section 6.3.5 of the CDC 1.1 specification for information | |
488 | * about the only notification we issue: SerialState change. | |
489 | */ | |
490 | static int acm_cdc_notify(struct f_acm *acm, u8 type, u16 value, | |
491 | void *data, unsigned length) | |
492 | { | |
493 | struct usb_ep *ep = acm->notify; | |
494 | struct usb_request *req; | |
495 | struct usb_cdc_notification *notify; | |
496 | const unsigned len = sizeof(*notify) + length; | |
497 | void *buf; | |
498 | int status; | |
499 | ||
500 | req = acm->notify_req; | |
501 | acm->notify_req = NULL; | |
502 | acm->pending = false; | |
503 | ||
504 | req->length = len; | |
505 | notify = req->buf; | |
506 | buf = notify + 1; | |
507 | ||
508 | notify->bmRequestType = USB_DIR_IN | USB_TYPE_CLASS | |
509 | | USB_RECIP_INTERFACE; | |
510 | notify->bNotificationType = type; | |
511 | notify->wValue = cpu_to_le16(value); | |
512 | notify->wIndex = cpu_to_le16(acm->ctrl_id); | |
513 | notify->wLength = cpu_to_le16(length); | |
514 | memcpy(buf, data, length); | |
515 | ||
e50ae572 DB |
516 | /* ep_queue() can complete immediately if it fills the fifo... */ |
517 | spin_unlock(&acm->lock); | |
1f1ba11b | 518 | status = usb_ep_queue(ep, req, GFP_ATOMIC); |
e50ae572 DB |
519 | spin_lock(&acm->lock); |
520 | ||
1f1ba11b DB |
521 | if (status < 0) { |
522 | ERROR(acm->port.func.config->cdev, | |
523 | "acm ttyGS%d can't notify serial state, %d\n", | |
524 | acm->port_num, status); | |
525 | acm->notify_req = req; | |
526 | } | |
527 | ||
528 | return status; | |
529 | } | |
530 | ||
531 | static int acm_notify_serial_state(struct f_acm *acm) | |
532 | { | |
533 | struct usb_composite_dev *cdev = acm->port.func.config->cdev; | |
534 | int status; | |
535 | ||
536 | spin_lock(&acm->lock); | |
537 | if (acm->notify_req) { | |
538 | DBG(cdev, "acm ttyGS%d serial state %04x\n", | |
539 | acm->port_num, acm->serial_state); | |
540 | status = acm_cdc_notify(acm, USB_CDC_NOTIFY_SERIAL_STATE, | |
541 | 0, &acm->serial_state, sizeof(acm->serial_state)); | |
542 | } else { | |
543 | acm->pending = true; | |
544 | status = 0; | |
545 | } | |
546 | spin_unlock(&acm->lock); | |
547 | return status; | |
548 | } | |
549 | ||
550 | static void acm_cdc_notify_complete(struct usb_ep *ep, struct usb_request *req) | |
551 | { | |
552 | struct f_acm *acm = req->context; | |
553 | u8 doit = false; | |
554 | ||
555 | /* on this call path we do NOT hold the port spinlock, | |
556 | * which is why ACM needs its own spinlock | |
557 | */ | |
558 | spin_lock(&acm->lock); | |
559 | if (req->status != -ESHUTDOWN) | |
560 | doit = acm->pending; | |
561 | acm->notify_req = req; | |
562 | spin_unlock(&acm->lock); | |
563 | ||
564 | if (doit) | |
565 | acm_notify_serial_state(acm); | |
566 | } | |
567 | ||
568 | /* connect == the TTY link is open */ | |
569 | ||
570 | static void acm_connect(struct gserial *port) | |
571 | { | |
572 | struct f_acm *acm = port_to_acm(port); | |
573 | ||
574 | acm->serial_state |= ACM_CTRL_DSR | ACM_CTRL_DCD; | |
575 | acm_notify_serial_state(acm); | |
576 | } | |
577 | ||
578 | static void acm_disconnect(struct gserial *port) | |
579 | { | |
580 | struct f_acm *acm = port_to_acm(port); | |
581 | ||
582 | acm->serial_state &= ~(ACM_CTRL_DSR | ACM_CTRL_DCD); | |
583 | acm_notify_serial_state(acm); | |
584 | } | |
585 | ||
586 | static int acm_send_break(struct gserial *port, int duration) | |
587 | { | |
588 | struct f_acm *acm = port_to_acm(port); | |
589 | u16 state; | |
590 | ||
591 | state = acm->serial_state; | |
592 | state &= ~ACM_CTRL_BRK; | |
593 | if (duration) | |
594 | state |= ACM_CTRL_BRK; | |
595 | ||
596 | acm->serial_state = state; | |
597 | return acm_notify_serial_state(acm); | |
598 | } | |
599 | ||
600 | /*-------------------------------------------------------------------------*/ | |
601 | ||
4d5a73dc | 602 | /* ACM function driver setup/binding */ |
28824b18 | 603 | static int |
4d5a73dc DB |
604 | acm_bind(struct usb_configuration *c, struct usb_function *f) |
605 | { | |
606 | struct usb_composite_dev *cdev = c->cdev; | |
607 | struct f_acm *acm = func_to_acm(f); | |
608 | int status; | |
609 | struct usb_ep *ep; | |
610 | ||
611 | /* allocate instance-specific interface IDs, and patch descriptors */ | |
612 | status = usb_interface_id(c, f); | |
613 | if (status < 0) | |
614 | goto fail; | |
615 | acm->ctrl_id = status; | |
b97503ff | 616 | acm_iad_descriptor.bFirstInterface = status; |
4d5a73dc DB |
617 | |
618 | acm_control_interface_desc.bInterfaceNumber = status; | |
619 | acm_union_desc .bMasterInterface0 = status; | |
620 | ||
621 | status = usb_interface_id(c, f); | |
622 | if (status < 0) | |
623 | goto fail; | |
624 | acm->data_id = status; | |
625 | ||
626 | acm_data_interface_desc.bInterfaceNumber = status; | |
627 | acm_union_desc.bSlaveInterface0 = status; | |
628 | acm_call_mgmt_descriptor.bDataInterface = status; | |
629 | ||
630 | status = -ENODEV; | |
631 | ||
632 | /* allocate instance-specific endpoints */ | |
633 | ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_in_desc); | |
634 | if (!ep) | |
635 | goto fail; | |
636 | acm->port.in = ep; | |
637 | ep->driver_data = cdev; /* claim */ | |
638 | ||
639 | ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_out_desc); | |
640 | if (!ep) | |
641 | goto fail; | |
642 | acm->port.out = ep; | |
643 | ep->driver_data = cdev; /* claim */ | |
644 | ||
645 | ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_notify_desc); | |
646 | if (!ep) | |
647 | goto fail; | |
648 | acm->notify = ep; | |
649 | ep->driver_data = cdev; /* claim */ | |
650 | ||
1f1ba11b DB |
651 | /* allocate notification */ |
652 | acm->notify_req = gs_alloc_req(ep, | |
653 | sizeof(struct usb_cdc_notification) + 2, | |
654 | GFP_KERNEL); | |
655 | if (!acm->notify_req) | |
656 | goto fail; | |
657 | ||
658 | acm->notify_req->complete = acm_cdc_notify_complete; | |
659 | acm->notify_req->context = acm; | |
660 | ||
4d5a73dc DB |
661 | /* support all relevant hardware speeds... we expect that when |
662 | * hardware is dual speed, all bulk-capable endpoints work at | |
663 | * both speeds | |
664 | */ | |
10287bae SAS |
665 | acm_hs_in_desc.bEndpointAddress = acm_fs_in_desc.bEndpointAddress; |
666 | acm_hs_out_desc.bEndpointAddress = acm_fs_out_desc.bEndpointAddress; | |
667 | acm_hs_notify_desc.bEndpointAddress = | |
668 | acm_fs_notify_desc.bEndpointAddress; | |
669 | ||
670 | acm_ss_in_desc.bEndpointAddress = acm_fs_in_desc.bEndpointAddress; | |
671 | acm_ss_out_desc.bEndpointAddress = acm_fs_out_desc.bEndpointAddress; | |
672 | ||
673 | status = usb_assign_descriptors(f, acm_fs_function, acm_hs_function, | |
674 | acm_ss_function); | |
675 | if (status) | |
676 | goto fail; | |
4d5a73dc | 677 | |
4d5a73dc DB |
678 | DBG(cdev, "acm ttyGS%d: %s speed IN/%s OUT/%s NOTIFY/%s\n", |
679 | acm->port_num, | |
6fecfb05 | 680 | gadget_is_superspeed(c->cdev->gadget) ? "super" : |
4d5a73dc DB |
681 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
682 | acm->port.in->name, acm->port.out->name, | |
683 | acm->notify->name); | |
684 | return 0; | |
685 | ||
686 | fail: | |
1f1ba11b DB |
687 | if (acm->notify_req) |
688 | gs_free_req(acm->notify, acm->notify_req); | |
689 | ||
4d5a73dc DB |
690 | /* we might as well release our claims on endpoints */ |
691 | if (acm->notify) | |
692 | acm->notify->driver_data = NULL; | |
693 | if (acm->port.out) | |
694 | acm->port.out->driver_data = NULL; | |
695 | if (acm->port.in) | |
696 | acm->port.in->driver_data = NULL; | |
697 | ||
698 | ERROR(cdev, "%s/%p: can't bind, err %d\n", f->name, f, status); | |
699 | ||
700 | return status; | |
701 | } | |
702 | ||
703 | static void | |
704 | acm_unbind(struct usb_configuration *c, struct usb_function *f) | |
705 | { | |
1f1ba11b DB |
706 | struct f_acm *acm = func_to_acm(f); |
707 | ||
1616e99d | 708 | acm_string_defs[0].id = 0; |
10287bae | 709 | usb_free_all_descriptors(f); |
1f1ba11b DB |
710 | gs_free_req(acm->notify, acm->notify_req); |
711 | kfree(acm); | |
4d5a73dc DB |
712 | } |
713 | ||
714 | /* Some controllers can't support CDC ACM ... */ | |
715 | static inline bool can_support_cdc(struct usb_configuration *c) | |
716 | { | |
4d5a73dc DB |
717 | /* everything else is *probably* fine ... */ |
718 | return true; | |
719 | } | |
720 | ||
721 | /** | |
722 | * acm_bind_config - add a CDC ACM function to a configuration | |
723 | * @c: the configuration to support the CDC ACM instance | |
724 | * @port_num: /dev/ttyGS* port this interface will use | |
725 | * Context: single threaded during gadget setup | |
726 | * | |
727 | * Returns zero on success, else negative errno. | |
728 | * | |
729 | * Caller must have called @gserial_setup() with enough ports to | |
730 | * handle all the ones it binds. Caller is also responsible | |
731 | * for calling @gserial_cleanup() before module unload. | |
732 | */ | |
28824b18 | 733 | int acm_bind_config(struct usb_configuration *c, u8 port_num) |
4d5a73dc DB |
734 | { |
735 | struct f_acm *acm; | |
736 | int status; | |
737 | ||
738 | if (!can_support_cdc(c)) | |
739 | return -EINVAL; | |
740 | ||
741 | /* REVISIT might want instance-specific strings to help | |
742 | * distinguish instances ... | |
743 | */ | |
744 | ||
745 | /* maybe allocate device-global string IDs, and patch descriptors */ | |
1616e99d SAS |
746 | if (acm_string_defs[0].id == 0) { |
747 | status = usb_string_ids_tab(c->cdev, acm_string_defs); | |
4d5a73dc DB |
748 | if (status < 0) |
749 | return status; | |
1616e99d SAS |
750 | acm_control_interface_desc.iInterface = |
751 | acm_string_defs[ACM_CTRL_IDX].id; | |
752 | acm_data_interface_desc.iInterface = | |
753 | acm_string_defs[ACM_DATA_IDX].id; | |
754 | acm_iad_descriptor.iFunction = acm_string_defs[ACM_IAD_IDX].id; | |
4d5a73dc DB |
755 | } |
756 | ||
757 | /* allocate and initialize one new instance */ | |
758 | acm = kzalloc(sizeof *acm, GFP_KERNEL); | |
759 | if (!acm) | |
760 | return -ENOMEM; | |
761 | ||
1f1ba11b DB |
762 | spin_lock_init(&acm->lock); |
763 | ||
4d5a73dc DB |
764 | acm->port_num = port_num; |
765 | ||
1f1ba11b DB |
766 | acm->port.connect = acm_connect; |
767 | acm->port.disconnect = acm_disconnect; | |
768 | acm->port.send_break = acm_send_break; | |
769 | ||
4d5a73dc DB |
770 | acm->port.func.name = "acm"; |
771 | acm->port.func.strings = acm_strings; | |
772 | /* descriptors are per-instance copies */ | |
773 | acm->port.func.bind = acm_bind; | |
774 | acm->port.func.unbind = acm_unbind; | |
775 | acm->port.func.set_alt = acm_set_alt; | |
776 | acm->port.func.setup = acm_setup; | |
777 | acm->port.func.disable = acm_disable; | |
778 | ||
779 | status = usb_add_function(c, &acm->port.func); | |
780 | if (status) | |
781 | kfree(acm); | |
782 | return status; | |
783 | } |