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Commit | Line | Data |
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cae8dc3b | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | # |
3 | # USB Gadget support on a system involves | |
4 | # (a) a peripheral controller, and | |
5 | # (b) the gadget driver using it. | |
6 | # | |
7 | # NOTE: Gadget support ** DOES NOT ** depend on host-side CONFIG_USB !! | |
8 | # | |
9 | # - Host systems (like PCs) need CONFIG_USB (with "A" jacks). | |
10 | # - Peripherals (like PDAs) need CONFIG_USB_GADGET (with "B" jacks). | |
cab00891 | 11 | # - Some systems have both kinds of controllers. |
1da177e4 LT |
12 | # |
13 | # With help from a special transceiver and a "Mini-AB" jack, systems with | |
14 | # both kinds of controller can also support "USB On-the-Go" (CONFIG_USB_OTG). | |
15 | # | |
1da177e4 | 16 | |
b75be4ab DC |
17 | menuconfig USB_GADGET |
18 | tristate "USB Gadget Support" | |
badf6d47 | 19 | select USB_COMMON |
86dc243c | 20 | select NLS |
1da177e4 | 21 | help |
b9b70170 GKH |
22 | USB is a host/device protocol, organized with one host (such as a |
23 | PC) controlling up to 127 peripheral devices. | |
1da177e4 LT |
24 | The USB hardware is asymmetric, which makes it easier to set up: |
25 | you can't connect a "to-the-host" connector to a peripheral. | |
26 | ||
27 | Linux can run in the host, or in the peripheral. In both cases | |
28 | you need a low level bus controller driver, and some software | |
29 | talking to it. Peripheral controllers are often discrete silicon, | |
30 | or are integrated with the CPU in a microcontroller. The more | |
e113f29c | 31 | familiar host side controllers have names like "EHCI", "OHCI", |
1da177e4 LT |
32 | or "UHCI", and are usually integrated into southbridges on PC |
33 | motherboards. | |
34 | ||
35 | Enable this configuration option if you want to run Linux inside | |
36 | a USB peripheral device. Configure one hardware driver for your | |
37 | peripheral/device side bus controller, and a "gadget driver" for | |
38 | your peripheral protocol. (If you use modular gadget drivers, | |
39 | you may configure more than one.) | |
40 | ||
41 | If in doubt, say "N" and don't enable these drivers; most people | |
42 | don't have this kind of hardware (except maybe inside Linux PDAs). | |
43 | ||
44 | For more information, see <http://www.linux-usb.org/gadget> and | |
05853ad6 | 45 | the kernel documentation for this API. |
1da177e4 | 46 | |
b75be4ab DC |
47 | if USB_GADGET |
48 | ||
70790f63 | 49 | config USB_GADGET_DEBUG |
6341e62b | 50 | bool "Debugging messages (DEVELOPMENT)" |
36e893d2 | 51 | depends on DEBUG_KERNEL |
70790f63 DB |
52 | help |
53 | Many controller and gadget drivers will print some debugging | |
54 | messages if you use this option to ask for those messages. | |
55 | ||
56 | Avoid enabling these messages, even if you're actively | |
57 | debugging such a driver. Many drivers will emit so many | |
cd108691 AL |
58 | messages that the driver timings are affected, which will |
59 | either create new failure modes or remove the one you're | |
60 | trying to track down. Never enable these messages for a | |
61 | production build. | |
62 | ||
63 | config USB_GADGET_VERBOSE | |
64 | bool "Verbose debugging Messages (DEVELOPMENT)" | |
65 | depends on USB_GADGET_DEBUG | |
66 | help | |
67 | Many controller and gadget drivers will print verbose debugging | |
68 | messages if you use this option to ask for those messages. | |
69 | ||
70 | Avoid enabling these messages, even if you're actively | |
71 | debugging such a driver. Many drivers will emit so many | |
70790f63 DB |
72 | messages that the driver timings are affected, which will |
73 | either create new failure modes or remove the one you're | |
74 | trying to track down. Never enable these messages for a | |
75 | production build. | |
76 | ||
1da177e4 | 77 | config USB_GADGET_DEBUG_FILES |
6341e62b | 78 | bool "Debugging information files (DEVELOPMENT)" |
36e893d2 | 79 | depends on PROC_FS |
1da177e4 LT |
80 | help |
81 | Some of the drivers in the "gadget" framework can expose | |
82 | debugging information in files such as /proc/driver/udc | |
83 | (for a peripheral controller). The information in these | |
84 | files may help when you're troubleshooting or bringing up a | |
85 | driver on a new board. Enable these files by choosing "Y" | |
86 | here. If in doubt, or to conserve kernel memory, say "N". | |
87 | ||
914a3f3b | 88 | config USB_GADGET_DEBUG_FS |
6341e62b | 89 | bool "Debugging information files in debugfs (DEVELOPMENT)" |
36e893d2 | 90 | depends on DEBUG_FS |
914a3f3b HS |
91 | help |
92 | Some of the drivers in the "gadget" framework can expose | |
93 | debugging information in files under /sys/kernel/debug/. | |
94 | The information in these files may help when you're | |
95 | troubleshooting or bringing up a driver on a new board. | |
96 | Enable these files by choosing "Y" here. If in doubt, or | |
97 | to conserve kernel memory, say "N". | |
98 | ||
36e893d2 DB |
99 | config USB_GADGET_VBUS_DRAW |
100 | int "Maximum VBUS Power usage (2-500 mA)" | |
101 | range 2 500 | |
102 | default 2 | |
103 | help | |
104 | Some devices need to draw power from USB when they are | |
105 | configured, perhaps to operate circuitry or to recharge | |
106 | batteries. This is in addition to any local power supply, | |
107 | such as an AC adapter or batteries. | |
108 | ||
109 | Enter the maximum power your device draws through USB, in | |
110 | milliAmperes. The permitted range of values is 2 - 500 mA; | |
111 | 0 mA would be legal, but can make some hosts misbehave. | |
112 | ||
113 | This value will be used except for system-specific gadget | |
114 | drivers that have more specific information. | |
115 | ||
6532c7fd PF |
116 | config USB_GADGET_STORAGE_NUM_BUFFERS |
117 | int "Number of storage pipeline buffers" | |
d8877fc7 | 118 | range 2 256 |
6532c7fd PF |
119 | default 2 |
120 | help | |
121 | Usually 2 buffers are enough to establish a good buffering | |
122 | pipeline. The number may be increased in order to compensate | |
123 | for a bursty VFS behaviour. For instance there may be CPU wake up | |
124 | latencies that makes the VFS to appear bursty in a system with | |
125 | an CPU on-demand governor. Especially if DMA is doing IO to | |
126 | offload the CPU. In this case the CPU will go into power | |
127 | save often and spin up occasionally to move data within VFS. | |
128 | If selecting USB_GADGET_DEBUG_FILES this value may be set by | |
129 | a module parameter as well. | |
130 | If unsure, say 2. | |
131 | ||
a5beaaf3 BW |
132 | config U_SERIAL_CONSOLE |
133 | bool "Serial gadget console support" | |
f8faa3bf | 134 | depends on USB_U_SERIAL |
a5beaaf3 BW |
135 | help |
136 | It supports the serial gadget can be used as a console. | |
137 | ||
90fccb52 | 138 | source "drivers/usb/gadget/udc/Kconfig" |
1da177e4 | 139 | |
1da177e4 LT |
140 | # |
141 | # USB Gadget Drivers | |
142 | # | |
a84d9e53 SAS |
143 | |
144 | # composite based drivers | |
145 | config USB_LIBCOMPOSITE | |
146 | tristate | |
88af8bbe | 147 | select CONFIGFS_FS |
a84d9e53 SAS |
148 | depends on USB_GADGET |
149 | ||
ff47f594 SAS |
150 | config USB_F_ACM |
151 | tristate | |
152 | ||
cf9a08ae SAS |
153 | config USB_F_SS_LB |
154 | tristate | |
155 | ||
3249ca22 SAS |
156 | config USB_U_SERIAL |
157 | tristate | |
158 | ||
f1a1823f AP |
159 | config USB_U_ETHER |
160 | tristate | |
161 | ||
eb9fecb9 RB |
162 | config USB_U_AUDIO |
163 | tristate | |
164 | ||
60540ea2 | 165 | config USB_F_SERIAL |
3249ca22 SAS |
166 | tristate |
167 | ||
1d8fc251 AP |
168 | config USB_F_OBEX |
169 | tristate | |
170 | ||
40d133d7 AP |
171 | config USB_F_NCM |
172 | tristate | |
173 | ||
fee562a6 AP |
174 | config USB_F_ECM |
175 | tristate | |
176 | ||
fcbdf12e AP |
177 | config USB_F_PHONET |
178 | tristate | |
179 | ||
b29002a1 AP |
180 | config USB_F_EEM |
181 | tristate | |
182 | ||
8cedba7c AP |
183 | config USB_F_SUBSET |
184 | tristate | |
185 | ||
f466c635 AP |
186 | config USB_F_RNDIS |
187 | tristate | |
188 | ||
e5eaa0dc AP |
189 | config USB_F_MASS_STORAGE |
190 | tristate | |
191 | ||
5920cda6 AP |
192 | config USB_F_FS |
193 | tristate | |
194 | ||
0591bc23 RB |
195 | config USB_F_UAC1 |
196 | tristate | |
197 | ||
d355339e | 198 | config USB_F_UAC1_LEGACY |
f3a3406b AP |
199 | tristate |
200 | ||
f8f93d24 AP |
201 | config USB_F_UAC2 |
202 | tristate | |
203 | ||
6d11ed76 AP |
204 | config USB_F_UVC |
205 | tristate | |
206 | ||
b85e9de9 AP |
207 | config USB_F_MIDI |
208 | tristate | |
209 | ||
cb382536 AP |
210 | config USB_F_HID |
211 | tristate | |
212 | ||
b26394bd AP |
213 | config USB_F_PRINTER |
214 | tristate | |
215 | ||
dc8c46a5 AP |
216 | config USB_F_TCM |
217 | tristate | |
218 | ||
1da177e4 LT |
219 | # this first set of drivers all depend on bulk-capable hardware. |
220 | ||
d1c02452 | 221 | config USB_CONFIGFS |
bc27f66e | 222 | tristate "USB Gadget functions configurable through configfs" |
d1c02452 AP |
223 | select USB_LIBCOMPOSITE |
224 | help | |
225 | A Linux USB "gadget" can be set up through configfs. | |
226 | If this is the case, the USB functions (which from the host's | |
227 | perspective are seen as interfaces) and configurations are | |
228 | specified simply by creating appropriate directories in configfs. | |
229 | Associating functions with configurations is done by creating | |
230 | appropriate symbolic links. | |
ecefae6d | 231 | For more information see Documentation/usb/gadget_configfs.rst. |
d1c02452 AP |
232 | |
233 | config USB_CONFIGFS_SERIAL | |
6341e62b | 234 | bool "Generic serial bulk in/out" |
d1c02452 AP |
235 | depends on USB_CONFIGFS |
236 | depends on TTY | |
237 | select USB_U_SERIAL | |
238 | select USB_F_SERIAL | |
239 | help | |
240 | The function talks to the Linux-USB generic serial driver. | |
241 | ||
242 | config USB_CONFIGFS_ACM | |
6341e62b | 243 | bool "Abstract Control Model (CDC ACM)" |
d1c02452 AP |
244 | depends on USB_CONFIGFS |
245 | depends on TTY | |
246 | select USB_U_SERIAL | |
247 | select USB_F_ACM | |
248 | help | |
249 | ACM serial link. This function can be used to interoperate with | |
250 | MS-Windows hosts or with the Linux-USB "cdc-acm" driver. | |
251 | ||
252 | config USB_CONFIGFS_OBEX | |
6341e62b | 253 | bool "Object Exchange Model (CDC OBEX)" |
d1c02452 AP |
254 | depends on USB_CONFIGFS |
255 | depends on TTY | |
256 | select USB_U_SERIAL | |
257 | select USB_F_OBEX | |
258 | help | |
259 | You will need a user space OBEX server talking to /dev/ttyGS*, | |
260 | since the kernel itself doesn't implement the OBEX protocol. | |
261 | ||
262 | config USB_CONFIGFS_NCM | |
6341e62b | 263 | bool "Network Control Model (CDC NCM)" |
d1c02452 AP |
264 | depends on USB_CONFIGFS |
265 | depends on NET | |
266 | select USB_U_ETHER | |
267 | select USB_F_NCM | |
d7889c20 | 268 | select CRC32 |
d1c02452 AP |
269 | help |
270 | NCM is an advanced protocol for Ethernet encapsulation, allows | |
271 | grouping of several ethernet frames into one USB transfer and | |
272 | different alignment possibilities. | |
273 | ||
274 | config USB_CONFIGFS_ECM | |
6341e62b | 275 | bool "Ethernet Control Model (CDC ECM)" |
d1c02452 AP |
276 | depends on USB_CONFIGFS |
277 | depends on NET | |
278 | select USB_U_ETHER | |
279 | select USB_F_ECM | |
280 | help | |
281 | The "Communication Device Class" (CDC) Ethernet Control Model. | |
282 | That protocol is often avoided with pure Ethernet adapters, in | |
283 | favor of simpler vendor-specific hardware, but is widely | |
284 | supported by firmware for smart network devices. | |
285 | ||
02832e56 | 286 | config USB_CONFIGFS_ECM_SUBSET |
6341e62b | 287 | bool "Ethernet Control Model (CDC ECM) subset" |
02832e56 AP |
288 | depends on USB_CONFIGFS |
289 | depends on NET | |
290 | select USB_U_ETHER | |
291 | select USB_F_SUBSET | |
292 | help | |
293 | On hardware that can't implement the full protocol, | |
294 | a simple CDC subset is used, placing fewer demands on USB. | |
295 | ||
b3df2faa AP |
296 | config USB_CONFIGFS_RNDIS |
297 | bool "RNDIS" | |
298 | depends on USB_CONFIGFS | |
299 | depends on NET | |
300 | select USB_U_ETHER | |
301 | select USB_F_RNDIS | |
302 | help | |
303 | Microsoft Windows XP bundles the "Remote NDIS" (RNDIS) protocol, | |
304 | and Microsoft provides redistributable binary RNDIS drivers for | |
305 | older versions of Windows. | |
306 | ||
307 | To make MS-Windows work with this, use Documentation/usb/linux.inf | |
308 | as the "driver info file". For versions of MS-Windows older than | |
309 | XP, you'll need to download drivers from Microsoft's website; a URL | |
310 | is given in comments found in that info file. | |
311 | ||
17b80976 AP |
312 | config USB_CONFIGFS_EEM |
313 | bool "Ethernet Emulation Model (EEM)" | |
314 | depends on USB_CONFIGFS | |
315 | depends on NET | |
316 | select USB_U_ETHER | |
317 | select USB_F_EEM | |
d7889c20 | 318 | select CRC32 |
17b80976 AP |
319 | help |
320 | CDC EEM is a newer USB standard that is somewhat simpler than CDC ECM | |
321 | and therefore can be supported by more hardware. Technically ECM and | |
322 | EEM are designed for different applications. The ECM model extends | |
323 | the network interface to the target (e.g. a USB cable modem), and the | |
324 | EEM model is for mobile devices to communicate with hosts using | |
325 | ethernet over USB. For Linux gadgets, however, the interface with | |
326 | the host is the same (a usbX device), so the differences are minimal. | |
327 | ||
83408745 | 328 | config USB_CONFIGFS_PHONET |
6341e62b | 329 | bool "Phonet protocol" |
83408745 AP |
330 | depends on USB_CONFIGFS |
331 | depends on NET | |
332 | depends on PHONET | |
333 | select USB_U_ETHER | |
334 | select USB_F_PHONET | |
335 | help | |
336 | The Phonet protocol implementation for USB device. | |
337 | ||
ef0aa4b9 | 338 | config USB_CONFIGFS_MASS_STORAGE |
6341e62b | 339 | bool "Mass storage" |
ef0aa4b9 | 340 | depends on USB_CONFIGFS |
bc912b0d | 341 | depends on BLOCK |
ef0aa4b9 AP |
342 | select USB_F_MASS_STORAGE |
343 | help | |
344 | The Mass Storage Gadget acts as a USB Mass Storage disk drive. | |
345 | As its storage repository it can use a regular file or a block | |
346 | device (in much the same way as the "loop" device driver), | |
347 | specified as a module parameter or sysfs option. | |
348 | ||
25d80151 | 349 | config USB_CONFIGFS_F_LB_SS |
6341e62b | 350 | bool "Loopback and sourcesink function (for testing)" |
c0501f47 AP |
351 | depends on USB_CONFIGFS |
352 | select USB_F_SS_LB | |
353 | help | |
25d80151 AP |
354 | Loopback function loops back a configurable number of transfers. |
355 | Sourcesink function either sinks and sources bulk data. | |
c0501f47 AP |
356 | It also implements control requests, for "chapter 9" conformance. |
357 | Make this be the first driver you try using on top of any new | |
358 | USB peripheral controller driver. Then you can use host-side | |
359 | test software, like the "usbtest" driver, to put your hardware | |
360 | and its driver through a basic set of functional tests. | |
361 | ||
b658499f | 362 | config USB_CONFIGFS_F_FS |
6341e62b | 363 | bool "Function filesystem (FunctionFS)" |
b658499f AP |
364 | depends on USB_CONFIGFS |
365 | select USB_F_FS | |
366 | help | |
367 | The Function Filesystem (FunctionFS) lets one create USB | |
368 | composite functions in user space in the same way GadgetFS | |
369 | lets one create USB gadgets in user space. This allows creation | |
370 | of composite gadgets such that some of the functions are | |
371 | implemented in kernel space (for instance Ethernet, serial or | |
372 | mass storage) and other are implemented in user space. | |
373 | ||
0591bc23 RB |
374 | config USB_CONFIGFS_F_UAC1 |
375 | bool "Audio Class 1.0" | |
376 | depends on USB_CONFIGFS | |
377 | depends on SND | |
378 | select USB_LIBCOMPOSITE | |
379 | select SND_PCM | |
380 | select USB_U_AUDIO | |
381 | select USB_F_UAC1 | |
382 | help | |
383 | This Audio function implements 1 AudioControl interface, | |
384 | 1 AudioStreaming Interface each for USB-OUT and USB-IN. | |
385 | This driver doesn't expect any real Audio codec to be present | |
386 | on the device - the audio streams are simply sinked to and | |
387 | sourced from a virtual ALSA sound card created. The user-space | |
388 | application may choose to do whatever it wants with the data | |
389 | received from the USB Host and choose to provide whatever it | |
390 | wants as audio data to the USB Host. | |
391 | ||
d355339e RB |
392 | config USB_CONFIGFS_F_UAC1_LEGACY |
393 | bool "Audio Class 1.0 (legacy implementation)" | |
cb0a59f5 AP |
394 | depends on USB_CONFIGFS |
395 | depends on SND | |
396 | select USB_LIBCOMPOSITE | |
397 | select SND_PCM | |
d355339e | 398 | select USB_F_UAC1_LEGACY |
cb0a59f5 AP |
399 | help |
400 | This Audio function implements 1 AudioControl interface, | |
401 | 1 AudioStreaming Interface each for USB-OUT and USB-IN. | |
0591bc23 RB |
402 | This is a legacy driver and requires a real Audio codec |
403 | to be present on the device. | |
cb0a59f5 AP |
404 | |
405 | config USB_CONFIGFS_F_UAC2 | |
6341e62b | 406 | bool "Audio Class 2.0" |
cb0a59f5 AP |
407 | depends on USB_CONFIGFS |
408 | depends on SND | |
409 | select USB_LIBCOMPOSITE | |
410 | select SND_PCM | |
eb9fecb9 | 411 | select USB_U_AUDIO |
cb0a59f5 AP |
412 | select USB_F_UAC2 |
413 | help | |
414 | This Audio function is compatible with USB Audio Class | |
415 | specification 2.0. It implements 1 AudioControl interface, | |
416 | 1 AudioStreaming Interface each for USB-OUT and USB-IN. | |
417 | This driver doesn't expect any real Audio codec to be present | |
418 | on the device - the audio streams are simply sinked to and | |
419 | sourced from a virtual ALSA sound card created. The user-space | |
420 | application may choose to do whatever it wants with the data | |
421 | received from the USB Host and choose to provide whatever it | |
422 | wants as audio data to the USB Host. | |
423 | ||
6f1de344 | 424 | config USB_CONFIGFS_F_MIDI |
6341e62b | 425 | bool "MIDI function" |
6f1de344 AP |
426 | depends on USB_CONFIGFS |
427 | depends on SND | |
428 | select USB_LIBCOMPOSITE | |
429 | select SND_RAWMIDI | |
430 | select USB_F_MIDI | |
431 | help | |
432 | The MIDI Function acts as a USB Audio device, with one MIDI | |
433 | input and one MIDI output. These MIDI jacks appear as | |
434 | a sound "card" in the ALSA sound system. Other MIDI | |
435 | connections can then be made on the gadget system, using | |
436 | ALSA's aconnect utility etc. | |
437 | ||
21a9476a | 438 | config USB_CONFIGFS_F_HID |
6341e62b | 439 | bool "HID function" |
21a9476a AP |
440 | depends on USB_CONFIGFS |
441 | select USB_F_HID | |
442 | help | |
443 | The HID function driver provides generic emulation of USB | |
444 | Human Interface Devices (HID). | |
445 | ||
ecefae6d | 446 | For more information, see Documentation/usb/gadget_hid.rst. |
21a9476a | 447 | |
46919a23 | 448 | config USB_CONFIGFS_F_UVC |
8333d3cd | 449 | bool "USB Webcam function" |
46919a23 | 450 | depends on USB_CONFIGFS |
e6be244a | 451 | depends on VIDEO_V4L2 |
46919a23 AP |
452 | depends on VIDEO_DEV |
453 | select VIDEOBUF2_VMALLOC | |
454 | select USB_F_UVC | |
455 | help | |
456 | The Webcam function acts as a composite USB Audio and Video Class | |
457 | device. It provides a userspace API to process UVC control requests | |
458 | and stream video data to the host. | |
459 | ||
ee1cd515 AP |
460 | config USB_CONFIGFS_F_PRINTER |
461 | bool "Printer function" | |
462 | select USB_F_PRINTER | |
f4b4976b | 463 | depends on USB_CONFIGFS |
ee1cd515 AP |
464 | help |
465 | The Printer function channels data between the USB host and a | |
466 | userspace program driving the print engine. The user space | |
467 | program reads and writes the device file /dev/g_printer<X> to | |
468 | receive or send printer data. It can use ioctl calls to | |
469 | the device file to get or set printer status. | |
470 | ||
ecefae6d | 471 | For more information, see Documentation/usb/gadget_printer.rst |
ee1cd515 AP |
472 | which includes sample code for accessing the device file. |
473 | ||
4bb8548d AP |
474 | config USB_CONFIGFS_F_TCM |
475 | bool "USB Gadget Target Fabric" | |
476 | depends on TARGET_CORE | |
477 | depends on USB_CONFIGFS | |
478 | select USB_LIBCOMPOSITE | |
479 | select USB_F_TCM | |
480 | help | |
481 | This fabric is a USB gadget component. Two USB protocols are | |
482 | supported that is BBB or BOT (Bulk Only Transport) and UAS | |
483 | (USB Attached SCSI). BOT is advertised on alternative | |
484 | interface 0 (primary) and UAS is on alternative interface 1. | |
485 | Both protocols can work on USB2.0 and USB3.0. | |
486 | UAS utilizes the USB 3.0 feature called streams support. | |
487 | ||
7a9618a2 BVA |
488 | source "drivers/usb/gadget/legacy/Kconfig" |
489 | ||
b75be4ab | 490 | endif # USB_GADGET |