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3086775a FB |
1 | /* |
2 | * f_obex.c -- USB CDC OBEX function driver | |
3 | * | |
4 | * Copyright (C) 2008 Nokia Corporation | |
5 | * Contact: Felipe Balbi <felipe.balbi@nokia.com> | |
6 | * | |
7 | * Based on f_acm.c by Al Borchers and David Brownell. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
3086775a FB |
13 | */ |
14 | ||
15 | /* #define VERBOSE_DEBUG */ | |
16 | ||
5a0e3ad6 | 17 | #include <linux/slab.h> |
3086775a | 18 | #include <linux/kernel.h> |
3086775a | 19 | #include <linux/device.h> |
6eb0de82 | 20 | #include <linux/module.h> |
3086775a FB |
21 | |
22 | #include "u_serial.h" | |
23 | #include "gadget_chips.h" | |
24 | ||
25 | ||
26 | /* | |
27 | * This CDC OBEX function support just packages a TTY-ish byte stream. | |
28 | * A user mode server will put it into "raw" mode and handle all the | |
29 | * relevant protocol details ... this is just a kernel passthrough. | |
21214278 DB |
30 | * When possible, we prevent gadget enumeration until that server is |
31 | * ready to handle the commands. | |
3086775a FB |
32 | */ |
33 | ||
3086775a FB |
34 | struct f_obex { |
35 | struct gserial port; | |
36 | u8 ctrl_id; | |
37 | u8 data_id; | |
38 | u8 port_num; | |
21214278 | 39 | u8 can_activate; |
3086775a FB |
40 | }; |
41 | ||
42 | static inline struct f_obex *func_to_obex(struct usb_function *f) | |
43 | { | |
44 | return container_of(f, struct f_obex, port.func); | |
45 | } | |
46 | ||
21214278 DB |
47 | static inline struct f_obex *port_to_obex(struct gserial *p) |
48 | { | |
49 | return container_of(p, struct f_obex, port); | |
50 | } | |
51 | ||
3086775a FB |
52 | /*-------------------------------------------------------------------------*/ |
53 | ||
54 | #define OBEX_CTRL_IDX 0 | |
55 | #define OBEX_DATA_IDX 1 | |
56 | ||
57 | static struct usb_string obex_string_defs[] = { | |
58 | [OBEX_CTRL_IDX].s = "CDC Object Exchange (OBEX)", | |
59 | [OBEX_DATA_IDX].s = "CDC OBEX Data", | |
60 | { }, /* end of list */ | |
61 | }; | |
62 | ||
63 | static struct usb_gadget_strings obex_string_table = { | |
64 | .language = 0x0409, /* en-US */ | |
65 | .strings = obex_string_defs, | |
66 | }; | |
67 | ||
68 | static struct usb_gadget_strings *obex_strings[] = { | |
69 | &obex_string_table, | |
70 | NULL, | |
71 | }; | |
72 | ||
73 | /*-------------------------------------------------------------------------*/ | |
74 | ||
75 | static struct usb_interface_descriptor obex_control_intf __initdata = { | |
76 | .bLength = sizeof(obex_control_intf), | |
77 | .bDescriptorType = USB_DT_INTERFACE, | |
78 | .bInterfaceNumber = 0, | |
79 | ||
80 | .bAlternateSetting = 0, | |
81 | .bNumEndpoints = 0, | |
82 | .bInterfaceClass = USB_CLASS_COMM, | |
83 | .bInterfaceSubClass = USB_CDC_SUBCLASS_OBEX, | |
84 | }; | |
85 | ||
86 | static struct usb_interface_descriptor obex_data_nop_intf __initdata = { | |
87 | .bLength = sizeof(obex_data_nop_intf), | |
88 | .bDescriptorType = USB_DT_INTERFACE, | |
89 | .bInterfaceNumber = 1, | |
90 | ||
91 | .bAlternateSetting = 0, | |
92 | .bNumEndpoints = 0, | |
93 | .bInterfaceClass = USB_CLASS_CDC_DATA, | |
94 | }; | |
95 | ||
96 | static struct usb_interface_descriptor obex_data_intf __initdata = { | |
97 | .bLength = sizeof(obex_data_intf), | |
98 | .bDescriptorType = USB_DT_INTERFACE, | |
99 | .bInterfaceNumber = 2, | |
100 | ||
101 | .bAlternateSetting = 1, | |
102 | .bNumEndpoints = 2, | |
103 | .bInterfaceClass = USB_CLASS_CDC_DATA, | |
104 | }; | |
105 | ||
106 | static struct usb_cdc_header_desc obex_cdc_header_desc __initdata = { | |
107 | .bLength = sizeof(obex_cdc_header_desc), | |
108 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
109 | .bDescriptorSubType = USB_CDC_HEADER_TYPE, | |
551509d2 | 110 | .bcdCDC = cpu_to_le16(0x0120), |
3086775a FB |
111 | }; |
112 | ||
113 | static struct usb_cdc_union_desc obex_cdc_union_desc __initdata = { | |
114 | .bLength = sizeof(obex_cdc_union_desc), | |
115 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
116 | .bDescriptorSubType = USB_CDC_UNION_TYPE, | |
117 | .bMasterInterface0 = 1, | |
118 | .bSlaveInterface0 = 2, | |
119 | }; | |
120 | ||
121 | static struct usb_cdc_obex_desc obex_desc __initdata = { | |
122 | .bLength = sizeof(obex_desc), | |
123 | .bDescriptorType = USB_DT_CS_INTERFACE, | |
124 | .bDescriptorSubType = USB_CDC_OBEX_TYPE, | |
551509d2 | 125 | .bcdVersion = cpu_to_le16(0x0100), |
3086775a FB |
126 | }; |
127 | ||
128 | /* High-Speed Support */ | |
129 | ||
130 | static struct usb_endpoint_descriptor obex_hs_ep_out_desc __initdata = { | |
131 | .bLength = USB_DT_ENDPOINT_SIZE, | |
132 | .bDescriptorType = USB_DT_ENDPOINT, | |
133 | ||
134 | .bEndpointAddress = USB_DIR_OUT, | |
135 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 136 | .wMaxPacketSize = cpu_to_le16(512), |
3086775a FB |
137 | }; |
138 | ||
139 | static struct usb_endpoint_descriptor obex_hs_ep_in_desc __initdata = { | |
140 | .bLength = USB_DT_ENDPOINT_SIZE, | |
141 | .bDescriptorType = USB_DT_ENDPOINT, | |
142 | ||
143 | .bEndpointAddress = USB_DIR_IN, | |
144 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
551509d2 | 145 | .wMaxPacketSize = cpu_to_le16(512), |
3086775a FB |
146 | }; |
147 | ||
148 | static struct usb_descriptor_header *hs_function[] __initdata = { | |
149 | (struct usb_descriptor_header *) &obex_control_intf, | |
150 | (struct usb_descriptor_header *) &obex_cdc_header_desc, | |
151 | (struct usb_descriptor_header *) &obex_desc, | |
152 | (struct usb_descriptor_header *) &obex_cdc_union_desc, | |
153 | ||
154 | (struct usb_descriptor_header *) &obex_data_nop_intf, | |
155 | (struct usb_descriptor_header *) &obex_data_intf, | |
156 | (struct usb_descriptor_header *) &obex_hs_ep_in_desc, | |
157 | (struct usb_descriptor_header *) &obex_hs_ep_out_desc, | |
158 | NULL, | |
159 | }; | |
160 | ||
161 | /* Full-Speed Support */ | |
162 | ||
163 | static struct usb_endpoint_descriptor obex_fs_ep_in_desc __initdata = { | |
164 | .bLength = USB_DT_ENDPOINT_SIZE, | |
165 | .bDescriptorType = USB_DT_ENDPOINT, | |
166 | ||
167 | .bEndpointAddress = USB_DIR_IN, | |
168 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
169 | }; | |
170 | ||
171 | static struct usb_endpoint_descriptor obex_fs_ep_out_desc __initdata = { | |
172 | .bLength = USB_DT_ENDPOINT_SIZE, | |
173 | .bDescriptorType = USB_DT_ENDPOINT, | |
174 | ||
175 | .bEndpointAddress = USB_DIR_OUT, | |
176 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
177 | }; | |
178 | ||
179 | static struct usb_descriptor_header *fs_function[] __initdata = { | |
180 | (struct usb_descriptor_header *) &obex_control_intf, | |
181 | (struct usb_descriptor_header *) &obex_cdc_header_desc, | |
182 | (struct usb_descriptor_header *) &obex_desc, | |
183 | (struct usb_descriptor_header *) &obex_cdc_union_desc, | |
184 | ||
185 | (struct usb_descriptor_header *) &obex_data_nop_intf, | |
186 | (struct usb_descriptor_header *) &obex_data_intf, | |
187 | (struct usb_descriptor_header *) &obex_fs_ep_in_desc, | |
188 | (struct usb_descriptor_header *) &obex_fs_ep_out_desc, | |
189 | NULL, | |
190 | }; | |
191 | ||
192 | /*-------------------------------------------------------------------------*/ | |
193 | ||
194 | static int obex_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
195 | { | |
196 | struct f_obex *obex = func_to_obex(f); | |
197 | struct usb_composite_dev *cdev = f->config->cdev; | |
198 | ||
199 | if (intf == obex->ctrl_id) { | |
200 | if (alt != 0) | |
201 | goto fail; | |
202 | /* NOP */ | |
203 | DBG(cdev, "reset obex ttyGS%d control\n", obex->port_num); | |
204 | ||
205 | } else if (intf == obex->data_id) { | |
206 | if (alt > 1) | |
207 | goto fail; | |
208 | ||
209 | if (obex->port.in->driver_data) { | |
210 | DBG(cdev, "reset obex ttyGS%d\n", obex->port_num); | |
211 | gserial_disconnect(&obex->port); | |
212 | } | |
213 | ||
ea2a1df7 | 214 | if (!obex->port.in->desc || !obex->port.out->desc) { |
3086775a | 215 | DBG(cdev, "init obex ttyGS%d\n", obex->port_num); |
ea2a1df7 TB |
216 | if (config_ep_by_speed(cdev->gadget, f, |
217 | obex->port.in) || | |
218 | config_ep_by_speed(cdev->gadget, f, | |
219 | obex->port.out)) { | |
220 | obex->port.out->desc = NULL; | |
221 | obex->port.in->desc = NULL; | |
222 | goto fail; | |
223 | } | |
3086775a FB |
224 | } |
225 | ||
226 | if (alt == 1) { | |
227 | DBG(cdev, "activate obex ttyGS%d\n", obex->port_num); | |
228 | gserial_connect(&obex->port, obex->port_num); | |
229 | } | |
230 | ||
231 | } else | |
232 | goto fail; | |
233 | ||
234 | return 0; | |
235 | ||
236 | fail: | |
237 | return -EINVAL; | |
238 | } | |
239 | ||
240 | static int obex_get_alt(struct usb_function *f, unsigned intf) | |
241 | { | |
242 | struct f_obex *obex = func_to_obex(f); | |
243 | ||
244 | if (intf == obex->ctrl_id) | |
245 | return 0; | |
246 | ||
247 | return obex->port.in->driver_data ? 1 : 0; | |
248 | } | |
249 | ||
250 | static void obex_disable(struct usb_function *f) | |
251 | { | |
252 | struct f_obex *obex = func_to_obex(f); | |
253 | struct usb_composite_dev *cdev = f->config->cdev; | |
254 | ||
255 | DBG(cdev, "obex ttyGS%d disable\n", obex->port_num); | |
256 | gserial_disconnect(&obex->port); | |
257 | } | |
258 | ||
259 | /*-------------------------------------------------------------------------*/ | |
260 | ||
21214278 DB |
261 | static void obex_connect(struct gserial *g) |
262 | { | |
263 | struct f_obex *obex = port_to_obex(g); | |
264 | struct usb_composite_dev *cdev = g->func.config->cdev; | |
265 | int status; | |
266 | ||
267 | if (!obex->can_activate) | |
268 | return; | |
269 | ||
270 | status = usb_function_activate(&g->func); | |
271 | if (status) | |
272 | DBG(cdev, "obex ttyGS%d function activate --> %d\n", | |
273 | obex->port_num, status); | |
274 | } | |
275 | ||
276 | static void obex_disconnect(struct gserial *g) | |
277 | { | |
278 | struct f_obex *obex = port_to_obex(g); | |
279 | struct usb_composite_dev *cdev = g->func.config->cdev; | |
280 | int status; | |
281 | ||
282 | if (!obex->can_activate) | |
283 | return; | |
284 | ||
285 | status = usb_function_deactivate(&g->func); | |
286 | if (status) | |
287 | DBG(cdev, "obex ttyGS%d function deactivate --> %d\n", | |
288 | obex->port_num, status); | |
289 | } | |
290 | ||
291 | /*-------------------------------------------------------------------------*/ | |
292 | ||
3086775a FB |
293 | static int __init |
294 | obex_bind(struct usb_configuration *c, struct usb_function *f) | |
295 | { | |
296 | struct usb_composite_dev *cdev = c->cdev; | |
297 | struct f_obex *obex = func_to_obex(f); | |
298 | int status; | |
299 | struct usb_ep *ep; | |
300 | ||
301 | /* allocate instance-specific interface IDs, and patch descriptors */ | |
302 | ||
303 | status = usb_interface_id(c, f); | |
304 | if (status < 0) | |
305 | goto fail; | |
306 | obex->ctrl_id = status; | |
307 | ||
308 | obex_control_intf.bInterfaceNumber = status; | |
309 | obex_cdc_union_desc.bMasterInterface0 = status; | |
310 | ||
311 | status = usb_interface_id(c, f); | |
312 | if (status < 0) | |
313 | goto fail; | |
314 | obex->data_id = status; | |
315 | ||
316 | obex_data_nop_intf.bInterfaceNumber = status; | |
317 | obex_data_intf.bInterfaceNumber = status; | |
318 | obex_cdc_union_desc.bSlaveInterface0 = status; | |
319 | ||
320 | /* allocate instance-specific endpoints */ | |
321 | ||
322 | ep = usb_ep_autoconfig(cdev->gadget, &obex_fs_ep_in_desc); | |
323 | if (!ep) | |
324 | goto fail; | |
325 | obex->port.in = ep; | |
326 | ep->driver_data = cdev; /* claim */ | |
327 | ||
328 | ep = usb_ep_autoconfig(cdev->gadget, &obex_fs_ep_out_desc); | |
329 | if (!ep) | |
330 | goto fail; | |
331 | obex->port.out = ep; | |
332 | ep->driver_data = cdev; /* claim */ | |
333 | ||
3086775a FB |
334 | /* support all relevant hardware speeds... we expect that when |
335 | * hardware is dual speed, all bulk-capable endpoints work at | |
336 | * both speeds | |
337 | */ | |
3086775a | 338 | |
10287bae SAS |
339 | obex_hs_ep_in_desc.bEndpointAddress = |
340 | obex_fs_ep_in_desc.bEndpointAddress; | |
341 | obex_hs_ep_out_desc.bEndpointAddress = | |
342 | obex_fs_ep_out_desc.bEndpointAddress; | |
3086775a | 343 | |
10287bae SAS |
344 | status = usb_assign_descriptors(f, fs_function, hs_function, NULL); |
345 | if (status) | |
346 | goto fail; | |
3086775a | 347 | |
21214278 DB |
348 | /* Avoid letting this gadget enumerate until the userspace |
349 | * OBEX server is active. | |
350 | */ | |
351 | status = usb_function_deactivate(f); | |
352 | if (status < 0) | |
353 | WARNING(cdev, "obex ttyGS%d: can't prevent enumeration, %d\n", | |
354 | obex->port_num, status); | |
355 | else | |
356 | obex->can_activate = true; | |
357 | ||
358 | ||
3086775a FB |
359 | DBG(cdev, "obex ttyGS%d: %s speed IN/%s OUT/%s\n", |
360 | obex->port_num, | |
361 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", | |
362 | obex->port.in->name, obex->port.out->name); | |
363 | ||
364 | return 0; | |
365 | ||
366 | fail: | |
10287bae | 367 | usb_free_all_descriptors(f); |
3086775a FB |
368 | /* we might as well release our claims on endpoints */ |
369 | if (obex->port.out) | |
370 | obex->port.out->driver_data = NULL; | |
371 | if (obex->port.in) | |
372 | obex->port.in->driver_data = NULL; | |
373 | ||
374 | ERROR(cdev, "%s/%p: can't bind, err %d\n", f->name, f, status); | |
375 | ||
376 | return status; | |
377 | } | |
378 | ||
379 | static void | |
380 | obex_unbind(struct usb_configuration *c, struct usb_function *f) | |
381 | { | |
10287bae | 382 | usb_free_all_descriptors(f); |
3086775a FB |
383 | kfree(func_to_obex(f)); |
384 | } | |
385 | ||
386 | /* Some controllers can't support CDC OBEX ... */ | |
387 | static inline bool can_support_obex(struct usb_configuration *c) | |
388 | { | |
389 | /* Since the first interface is a NOP, we can ignore the | |
390 | * issue of multi-interface support on most controllers. | |
391 | * | |
392 | * Altsettings are mandatory, however... | |
393 | */ | |
394 | if (!gadget_supports_altsettings(c->cdev->gadget)) | |
395 | return false; | |
396 | ||
397 | /* everything else is *probably* fine ... */ | |
398 | return true; | |
399 | } | |
400 | ||
401 | /** | |
402 | * obex_bind_config - add a CDC OBEX function to a configuration | |
403 | * @c: the configuration to support the CDC OBEX instance | |
404 | * @port_num: /dev/ttyGS* port this interface will use | |
405 | * Context: single threaded during gadget setup | |
406 | * | |
407 | * Returns zero on success, else negative errno. | |
408 | * | |
409 | * Caller must have called @gserial_setup() with enough ports to | |
410 | * handle all the ones it binds. Caller is also responsible | |
411 | * for calling @gserial_cleanup() before module unload. | |
412 | */ | |
413 | int __init obex_bind_config(struct usb_configuration *c, u8 port_num) | |
414 | { | |
415 | struct f_obex *obex; | |
416 | int status; | |
417 | ||
418 | if (!can_support_obex(c)) | |
419 | return -EINVAL; | |
420 | ||
421 | /* maybe allocate device-global string IDs, and patch descriptors */ | |
422 | if (obex_string_defs[OBEX_CTRL_IDX].id == 0) { | |
423 | status = usb_string_id(c->cdev); | |
424 | if (status < 0) | |
425 | return status; | |
426 | obex_string_defs[OBEX_CTRL_IDX].id = status; | |
427 | ||
428 | obex_control_intf.iInterface = status; | |
429 | ||
430 | status = usb_string_id(c->cdev); | |
431 | if (status < 0) | |
432 | return status; | |
433 | obex_string_defs[OBEX_DATA_IDX].id = status; | |
434 | ||
435 | obex_data_nop_intf.iInterface = | |
436 | obex_data_intf.iInterface = status; | |
437 | } | |
438 | ||
439 | /* allocate and initialize one new instance */ | |
440 | obex = kzalloc(sizeof *obex, GFP_KERNEL); | |
441 | if (!obex) | |
442 | return -ENOMEM; | |
443 | ||
444 | obex->port_num = port_num; | |
445 | ||
21214278 DB |
446 | obex->port.connect = obex_connect; |
447 | obex->port.disconnect = obex_disconnect; | |
448 | ||
3086775a FB |
449 | obex->port.func.name = "obex"; |
450 | obex->port.func.strings = obex_strings; | |
451 | /* descriptors are per-instance copies */ | |
452 | obex->port.func.bind = obex_bind; | |
453 | obex->port.func.unbind = obex_unbind; | |
454 | obex->port.func.set_alt = obex_set_alt; | |
455 | obex->port.func.get_alt = obex_get_alt; | |
456 | obex->port.func.disable = obex_disable; | |
457 | ||
458 | status = usb_add_function(c, &obex->port.func); | |
459 | if (status) | |
460 | kfree(obex); | |
461 | ||
462 | return status; | |
463 | } | |
464 | ||
465 | MODULE_AUTHOR("Felipe Balbi"); | |
466 | MODULE_LICENSE("GPL"); |