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authorFelipe Balbi <felipe.balbi@nokia.com>2008-08-18 20:39:30 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 17:40:53 -0400
commit3086775a4916b0fe128d924d83f4e7d7c39e4d0e (patch)
treec4e7825ba74da1272d15ad0d61a311b84392b8b6 /drivers/usb/gadget/f_obex.c
parent60beed95e38793c0baff7f94433c1f639d8d5efd (diff)
usb gadget: cdc obex glue
The following patch introduces a new f_obex.c function driver. It allows userspace obex servers to use usb as transport layer for their messages. [ dbrownell@users.sourceforge.net: various fixes and cleanups ] Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/f_obex.c')
-rw-r--r--drivers/usb/gadget/f_obex.c446
1 files changed, 446 insertions, 0 deletions
diff --git a/drivers/usb/gadget/f_obex.c b/drivers/usb/gadget/f_obex.c
new file mode 100644
index 000000000000..86241b2ca8f4
--- /dev/null
+++ b/drivers/usb/gadget/f_obex.c
@@ -0,0 +1,446 @@
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.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24/* #define VERBOSE_DEBUG */
25
26#include <linux/kernel.h>
27#include <linux/utsname.h>
28#include <linux/device.h>
29
30#include "u_serial.h"
31#include "gadget_chips.h"
32
33
34/*
35 * This CDC OBEX function support just packages a TTY-ish byte stream.
36 * A user mode server will put it into "raw" mode and handle all the
37 * relevant protocol details ... this is just a kernel passthrough.
38 *
39 * REVISIT this driver shouldn't actually activate before that user mode
40 * server is ready to respond! When the "serial gadget" utility code
41 * adds open/close notifications, this driver should use them with new
42 * (TBS) composite gadget hooks that wrap usb_gadget_disconnect() and
43 * usb_gadget_connect() calls with refcounts ... disconnect() when we
44 * bind, then connect() when the user server code is ready to respond.
45 */
46
47struct obex_ep_descs {
48 struct usb_endpoint_descriptor *obex_in;
49 struct usb_endpoint_descriptor *obex_out;
50};
51
52struct f_obex {
53 struct gserial port;
54 u8 ctrl_id;
55 u8 data_id;
56 u8 port_num;
57
58 struct obex_ep_descs fs;
59 struct obex_ep_descs hs;
60};
61
62static inline struct f_obex *func_to_obex(struct usb_function *f)
63{
64 return container_of(f, struct f_obex, port.func);
65}
66
67/*-------------------------------------------------------------------------*/
68
69#define OBEX_CTRL_IDX 0
70#define OBEX_DATA_IDX 1
71
72static struct usb_string obex_string_defs[] = {
73 [OBEX_CTRL_IDX].s = "CDC Object Exchange (OBEX)",
74 [OBEX_DATA_IDX].s = "CDC OBEX Data",
75 { }, /* end of list */
76};
77
78static struct usb_gadget_strings obex_string_table = {
79 .language = 0x0409, /* en-US */
80 .strings = obex_string_defs,
81};
82
83static struct usb_gadget_strings *obex_strings[] = {
84 &obex_string_table,
85 NULL,
86};
87
88/*-------------------------------------------------------------------------*/
89
90static struct usb_interface_descriptor obex_control_intf __initdata = {
91 .bLength = sizeof(obex_control_intf),
92 .bDescriptorType = USB_DT_INTERFACE,
93 .bInterfaceNumber = 0,
94
95 .bAlternateSetting = 0,
96 .bNumEndpoints = 0,
97 .bInterfaceClass = USB_CLASS_COMM,
98 .bInterfaceSubClass = USB_CDC_SUBCLASS_OBEX,
99};
100
101static struct usb_interface_descriptor obex_data_nop_intf __initdata = {
102 .bLength = sizeof(obex_data_nop_intf),
103 .bDescriptorType = USB_DT_INTERFACE,
104 .bInterfaceNumber = 1,
105
106 .bAlternateSetting = 0,
107 .bNumEndpoints = 0,
108 .bInterfaceClass = USB_CLASS_CDC_DATA,
109};
110
111static struct usb_interface_descriptor obex_data_intf __initdata = {
112 .bLength = sizeof(obex_data_intf),
113 .bDescriptorType = USB_DT_INTERFACE,
114 .bInterfaceNumber = 2,
115
116 .bAlternateSetting = 1,
117 .bNumEndpoints = 2,
118 .bInterfaceClass = USB_CLASS_CDC_DATA,
119};
120
121static struct usb_cdc_header_desc obex_cdc_header_desc __initdata = {
122 .bLength = sizeof(obex_cdc_header_desc),
123 .bDescriptorType = USB_DT_CS_INTERFACE,
124 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
125 .bcdCDC = __constant_cpu_to_le16(0x0120),
126};
127
128static struct usb_cdc_union_desc obex_cdc_union_desc __initdata = {
129 .bLength = sizeof(obex_cdc_union_desc),
130 .bDescriptorType = USB_DT_CS_INTERFACE,
131 .bDescriptorSubType = USB_CDC_UNION_TYPE,
132 .bMasterInterface0 = 1,
133 .bSlaveInterface0 = 2,
134};
135
136static struct usb_cdc_obex_desc obex_desc __initdata = {
137 .bLength = sizeof(obex_desc),
138 .bDescriptorType = USB_DT_CS_INTERFACE,
139 .bDescriptorSubType = USB_CDC_OBEX_TYPE,
140 .bcdVersion = __constant_cpu_to_le16(0x0100),
141};
142
143/* High-Speed Support */
144
145static struct usb_endpoint_descriptor obex_hs_ep_out_desc __initdata = {
146 .bLength = USB_DT_ENDPOINT_SIZE,
147 .bDescriptorType = USB_DT_ENDPOINT,
148
149 .bEndpointAddress = USB_DIR_OUT,
150 .bmAttributes = USB_ENDPOINT_XFER_BULK,
151 .wMaxPacketSize = __constant_cpu_to_le16(512),
152};
153
154static struct usb_endpoint_descriptor obex_hs_ep_in_desc __initdata = {
155 .bLength = USB_DT_ENDPOINT_SIZE,
156 .bDescriptorType = USB_DT_ENDPOINT,
157
158 .bEndpointAddress = USB_DIR_IN,
159 .bmAttributes = USB_ENDPOINT_XFER_BULK,
160 .wMaxPacketSize = __constant_cpu_to_le16(512),
161};
162
163static struct usb_descriptor_header *hs_function[] __initdata = {
164 (struct usb_descriptor_header *) &obex_control_intf,
165 (struct usb_descriptor_header *) &obex_cdc_header_desc,
166 (struct usb_descriptor_header *) &obex_desc,
167 (struct usb_descriptor_header *) &obex_cdc_union_desc,
168
169 (struct usb_descriptor_header *) &obex_data_nop_intf,
170 (struct usb_descriptor_header *) &obex_data_intf,
171 (struct usb_descriptor_header *) &obex_hs_ep_in_desc,
172 (struct usb_descriptor_header *) &obex_hs_ep_out_desc,
173 NULL,
174};
175
176/* Full-Speed Support */
177
178static struct usb_endpoint_descriptor obex_fs_ep_in_desc __initdata = {
179 .bLength = USB_DT_ENDPOINT_SIZE,
180 .bDescriptorType = USB_DT_ENDPOINT,
181
182 .bEndpointAddress = USB_DIR_IN,
183 .bmAttributes = USB_ENDPOINT_XFER_BULK,
184};
185
186static struct usb_endpoint_descriptor obex_fs_ep_out_desc __initdata = {
187 .bLength = USB_DT_ENDPOINT_SIZE,
188 .bDescriptorType = USB_DT_ENDPOINT,
189
190 .bEndpointAddress = USB_DIR_OUT,
191 .bmAttributes = USB_ENDPOINT_XFER_BULK,
192};
193
194static struct usb_descriptor_header *fs_function[] __initdata = {
195 (struct usb_descriptor_header *) &obex_control_intf,
196 (struct usb_descriptor_header *) &obex_cdc_header_desc,
197 (struct usb_descriptor_header *) &obex_desc,
198 (struct usb_descriptor_header *) &obex_cdc_union_desc,
199
200 (struct usb_descriptor_header *) &obex_data_nop_intf,
201 (struct usb_descriptor_header *) &obex_data_intf,
202 (struct usb_descriptor_header *) &obex_fs_ep_in_desc,
203 (struct usb_descriptor_header *) &obex_fs_ep_out_desc,
204 NULL,
205};
206
207/*-------------------------------------------------------------------------*/
208
209static int obex_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
210{
211 struct f_obex *obex = func_to_obex(f);
212 struct usb_composite_dev *cdev = f->config->cdev;
213
214 if (intf == obex->ctrl_id) {
215 if (alt != 0)
216 goto fail;
217 /* NOP */
218 DBG(cdev, "reset obex ttyGS%d control\n", obex->port_num);
219
220 } else if (intf == obex->data_id) {
221 if (alt > 1)
222 goto fail;
223
224 if (obex->port.in->driver_data) {
225 DBG(cdev, "reset obex ttyGS%d\n", obex->port_num);
226 gserial_disconnect(&obex->port);
227 }
228
229 if (!obex->port.in_desc) {
230 DBG(cdev, "init obex ttyGS%d\n", obex->port_num);
231 obex->port.in_desc = ep_choose(cdev->gadget,
232 obex->hs.obex_in, obex->fs.obex_in);
233 obex->port.out_desc = ep_choose(cdev->gadget,
234 obex->hs.obex_out, obex->fs.obex_out);
235 }
236
237 if (alt == 1) {
238 DBG(cdev, "activate obex ttyGS%d\n", obex->port_num);
239 gserial_connect(&obex->port, obex->port_num);
240 }
241
242 } else
243 goto fail;
244
245 return 0;
246
247fail:
248 return -EINVAL;
249}
250
251static int obex_get_alt(struct usb_function *f, unsigned intf)
252{
253 struct f_obex *obex = func_to_obex(f);
254
255 if (intf == obex->ctrl_id)
256 return 0;
257
258 return obex->port.in->driver_data ? 1 : 0;
259}
260
261static void obex_disable(struct usb_function *f)
262{
263 struct f_obex *obex = func_to_obex(f);
264 struct usb_composite_dev *cdev = f->config->cdev;
265
266 DBG(cdev, "obex ttyGS%d disable\n", obex->port_num);
267 gserial_disconnect(&obex->port);
268}
269
270/*-------------------------------------------------------------------------*/
271
272static int __init
273obex_bind(struct usb_configuration *c, struct usb_function *f)
274{
275 struct usb_composite_dev *cdev = c->cdev;
276 struct f_obex *obex = func_to_obex(f);
277 int status;
278 struct usb_ep *ep;
279
280 /* allocate instance-specific interface IDs, and patch descriptors */
281
282 status = usb_interface_id(c, f);
283 if (status < 0)
284 goto fail;
285 obex->ctrl_id = status;
286
287 obex_control_intf.bInterfaceNumber = status;
288 obex_cdc_union_desc.bMasterInterface0 = status;
289
290 status = usb_interface_id(c, f);
291 if (status < 0)
292 goto fail;
293 obex->data_id = status;
294
295 obex_data_nop_intf.bInterfaceNumber = status;
296 obex_data_intf.bInterfaceNumber = status;
297 obex_cdc_union_desc.bSlaveInterface0 = status;
298
299 /* allocate instance-specific endpoints */
300
301 ep = usb_ep_autoconfig(cdev->gadget, &obex_fs_ep_in_desc);
302 if (!ep)
303 goto fail;
304 obex->port.in = ep;
305 ep->driver_data = cdev; /* claim */
306
307 ep = usb_ep_autoconfig(cdev->gadget, &obex_fs_ep_out_desc);
308 if (!ep)
309 goto fail;
310 obex->port.out = ep;
311 ep->driver_data = cdev; /* claim */
312
313 /* copy descriptors, and track endpoint copies */
314 f->descriptors = usb_copy_descriptors(fs_function);
315
316 obex->fs.obex_in = usb_find_endpoint(fs_function,
317 f->descriptors, &obex_fs_ep_in_desc);
318 obex->fs.obex_out = usb_find_endpoint(fs_function,
319 f->descriptors, &obex_fs_ep_out_desc);
320
321 /* support all relevant hardware speeds... we expect that when
322 * hardware is dual speed, all bulk-capable endpoints work at
323 * both speeds
324 */
325 if (gadget_is_dualspeed(c->cdev->gadget)) {
326
327 obex_hs_ep_in_desc.bEndpointAddress =
328 obex_fs_ep_in_desc.bEndpointAddress;
329 obex_hs_ep_out_desc.bEndpointAddress =
330 obex_fs_ep_out_desc.bEndpointAddress;
331
332 /* copy descriptors, and track endpoint copies */
333 f->hs_descriptors = usb_copy_descriptors(hs_function);
334
335 obex->hs.obex_in = usb_find_endpoint(hs_function,
336 f->descriptors, &obex_hs_ep_in_desc);
337 obex->hs.obex_out = usb_find_endpoint(hs_function,
338 f->descriptors, &obex_hs_ep_out_desc);
339 }
340
341 DBG(cdev, "obex ttyGS%d: %s speed IN/%s OUT/%s\n",
342 obex->port_num,
343 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
344 obex->port.in->name, obex->port.out->name);
345
346 return 0;
347
348fail:
349 /* we might as well release our claims on endpoints */
350 if (obex->port.out)
351 obex->port.out->driver_data = NULL;
352 if (obex->port.in)
353 obex->port.in->driver_data = NULL;
354
355 ERROR(cdev, "%s/%p: can't bind, err %d\n", f->name, f, status);
356
357 return status;
358}
359
360static void
361obex_unbind(struct usb_configuration *c, struct usb_function *f)
362{
363 if (gadget_is_dualspeed(c->cdev->gadget))
364 usb_free_descriptors(f->hs_descriptors);
365 usb_free_descriptors(f->descriptors);
366 kfree(func_to_obex(f));
367}
368
369/* Some controllers can't support CDC OBEX ... */
370static inline bool can_support_obex(struct usb_configuration *c)
371{
372 /* Since the first interface is a NOP, we can ignore the
373 * issue of multi-interface support on most controllers.
374 *
375 * Altsettings are mandatory, however...
376 */
377 if (!gadget_supports_altsettings(c->cdev->gadget))
378 return false;
379
380 /* everything else is *probably* fine ... */
381 return true;
382}
383
384/**
385 * obex_bind_config - add a CDC OBEX function to a configuration
386 * @c: the configuration to support the CDC OBEX instance
387 * @port_num: /dev/ttyGS* port this interface will use
388 * Context: single threaded during gadget setup
389 *
390 * Returns zero on success, else negative errno.
391 *
392 * Caller must have called @gserial_setup() with enough ports to
393 * handle all the ones it binds. Caller is also responsible
394 * for calling @gserial_cleanup() before module unload.
395 */
396int __init obex_bind_config(struct usb_configuration *c, u8 port_num)
397{
398 struct f_obex *obex;
399 int status;
400
401 if (!can_support_obex(c))
402 return -EINVAL;
403
404 /* maybe allocate device-global string IDs, and patch descriptors */
405 if (obex_string_defs[OBEX_CTRL_IDX].id == 0) {
406 status = usb_string_id(c->cdev);
407 if (status < 0)
408 return status;
409 obex_string_defs[OBEX_CTRL_IDX].id = status;
410
411 obex_control_intf.iInterface = status;
412
413 status = usb_string_id(c->cdev);
414 if (status < 0)
415 return status;
416 obex_string_defs[OBEX_DATA_IDX].id = status;
417
418 obex_data_nop_intf.iInterface =
419 obex_data_intf.iInterface = status;
420 }
421
422 /* allocate and initialize one new instance */
423 obex = kzalloc(sizeof *obex, GFP_KERNEL);
424 if (!obex)
425 return -ENOMEM;
426
427 obex->port_num = port_num;
428
429 obex->port.func.name = "obex";
430 obex->port.func.strings = obex_strings;
431 /* descriptors are per-instance copies */
432 obex->port.func.bind = obex_bind;
433 obex->port.func.unbind = obex_unbind;
434 obex->port.func.set_alt = obex_set_alt;
435 obex->port.func.get_alt = obex_get_alt;
436 obex->port.func.disable = obex_disable;
437
438 status = usb_add_function(c, &obex->port.func);
439 if (status)
440 kfree(obex);
441
442 return status;
443}
444
445MODULE_AUTHOR("Felipe Balbi");
446MODULE_LICENSE("GPL");