Commit | Line | Data |
---|---|---|
5ab54cf7 MN |
1 | /* |
2 | * g_ffs.c -- user mode file system API for USB composite function controllers | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
54b8360f | 5 | * Author: Michal Nazarewicz <mina86@mina86.com> |
5ab54cf7 MN |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
5ab54cf7 MN |
11 | */ |
12 | ||
aa02f172 MN |
13 | #define pr_fmt(fmt) "g_ffs: " fmt |
14 | ||
c6c56008 MN |
15 | #include <linux/module.h> |
16 | #include <linux/utsname.h> | |
17 | ||
c6c56008 MN |
18 | /* |
19 | * kbuild is not very cooperative with respect to linking separately | |
20 | * compiled library objects into one module. So for now we won't use | |
21 | * separate compilation ... ensuring init/exit sections work to shrink | |
22 | * the runtime footprint, and giving us at least some parts of what | |
23 | * a "gcc --combine ... part1.c part2.c part3.c ... " build would. | |
24 | */ | |
25 | ||
26 | #include "composite.c" | |
c6c56008 MN |
27 | |
28 | #if defined CONFIG_USB_FUNCTIONFS_ETH || defined CONFIG_USB_FUNCTIONFS_RNDIS | |
29 | # if defined USB_ETH_RNDIS | |
30 | # undef USB_ETH_RNDIS | |
31 | # endif | |
32 | # ifdef CONFIG_USB_FUNCTIONFS_RNDIS | |
33 | # define USB_ETH_RNDIS y | |
34 | # endif | |
35 | ||
36 | # include "f_ecm.c" | |
37 | # include "f_subset.c" | |
38 | # ifdef USB_ETH_RNDIS | |
39 | # include "f_rndis.c" | |
40 | # include "rndis.c" | |
41 | # endif | |
42 | # include "u_ether.c" | |
43 | ||
44 | static u8 gfs_hostaddr[ETH_ALEN]; | |
f8dae531 MN |
45 | # ifdef CONFIG_USB_FUNCTIONFS_ETH |
46 | static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]); | |
c6c56008 | 47 | # endif |
f8dae531 | 48 | #else |
c6c56008 MN |
49 | # define gether_cleanup() do { } while (0) |
50 | # define gether_setup(gadget, hostaddr) ((int)0) | |
f8dae531 | 51 | # define gfs_hostaddr NULL |
c6c56008 MN |
52 | #endif |
53 | ||
54 | #include "f_fs.c" | |
55 | ||
c6c56008 MN |
56 | #define DRIVER_NAME "g_ffs" |
57 | #define DRIVER_DESC "USB Function Filesystem" | |
58 | #define DRIVER_VERSION "24 Aug 2004" | |
59 | ||
60 | MODULE_DESCRIPTION(DRIVER_DESC); | |
61 | MODULE_AUTHOR("Michal Nazarewicz"); | |
62 | MODULE_LICENSE("GPL"); | |
63 | ||
fc19de61 MN |
64 | #define GFS_VENDOR_ID 0x1d6b /* Linux Foundation */ |
65 | #define GFS_PRODUCT_ID 0x0105 /* FunctionFS Gadget */ | |
c6c56008 | 66 | |
581791f5 AP |
67 | #define GFS_MAX_DEVS 10 |
68 | ||
69 | struct gfs_ffs_obj { | |
70 | const char *name; | |
71 | bool mounted; | |
72 | bool desc_ready; | |
73 | struct ffs_data *ffs_data; | |
74 | }; | |
75 | ||
c6c56008 MN |
76 | static struct usb_device_descriptor gfs_dev_desc = { |
77 | .bLength = sizeof gfs_dev_desc, | |
78 | .bDescriptorType = USB_DT_DEVICE, | |
79 | ||
80 | .bcdUSB = cpu_to_le16(0x0200), | |
81 | .bDeviceClass = USB_CLASS_PER_INTERFACE, | |
82 | ||
fc19de61 MN |
83 | .idVendor = cpu_to_le16(GFS_VENDOR_ID), |
84 | .idProduct = cpu_to_le16(GFS_PRODUCT_ID), | |
c6c56008 MN |
85 | }; |
86 | ||
581791f5 AP |
87 | static char *func_names[GFS_MAX_DEVS]; |
88 | static unsigned int func_num; | |
89 | ||
fc19de61 MN |
90 | module_param_named(bDeviceClass, gfs_dev_desc.bDeviceClass, byte, 0644); |
91 | MODULE_PARM_DESC(bDeviceClass, "USB Device class"); | |
92 | module_param_named(bDeviceSubClass, gfs_dev_desc.bDeviceSubClass, byte, 0644); | |
93 | MODULE_PARM_DESC(bDeviceSubClass, "USB Device subclass"); | |
94 | module_param_named(bDeviceProtocol, gfs_dev_desc.bDeviceProtocol, byte, 0644); | |
95 | MODULE_PARM_DESC(bDeviceProtocol, "USB Device protocol"); | |
581791f5 AP |
96 | module_param_array_named(functions, func_names, charp, &func_num, 0); |
97 | MODULE_PARM_DESC(functions, "USB Functions list"); | |
c6c56008 | 98 | |
c6c56008 MN |
99 | static const struct usb_descriptor_header *gfs_otg_desc[] = { |
100 | (const struct usb_descriptor_header *) | |
101 | &(const struct usb_otg_descriptor) { | |
102 | .bLength = sizeof(struct usb_otg_descriptor), | |
103 | .bDescriptorType = USB_DT_OTG, | |
104 | ||
fc19de61 MN |
105 | /* |
106 | * REVISIT SRP-only hardware is possible, although | |
107 | * it would not be called "OTG" ... | |
108 | */ | |
c6c56008 MN |
109 | .bmAttributes = USB_OTG_SRP | USB_OTG_HNP, |
110 | }, | |
111 | ||
112 | NULL | |
113 | }; | |
114 | ||
5ab54cf7 | 115 | /* String IDs are assigned dynamically */ |
c6c56008 | 116 | static struct usb_string gfs_strings[] = { |
c6c56008 | 117 | #ifdef CONFIG_USB_FUNCTIONFS_RNDIS |
f8dae531 | 118 | { .s = "FunctionFS + RNDIS" }, |
c6c56008 MN |
119 | #endif |
120 | #ifdef CONFIG_USB_FUNCTIONFS_ETH | |
f8dae531 | 121 | { .s = "FunctionFS + ECM" }, |
c6c56008 MN |
122 | #endif |
123 | #ifdef CONFIG_USB_FUNCTIONFS_GENERIC | |
f8dae531 | 124 | { .s = "FunctionFS" }, |
c6c56008 MN |
125 | #endif |
126 | { } /* end of list */ | |
127 | }; | |
128 | ||
129 | static struct usb_gadget_strings *gfs_dev_strings[] = { | |
130 | &(struct usb_gadget_strings) { | |
131 | .language = 0x0409, /* en-us */ | |
132 | .strings = gfs_strings, | |
133 | }, | |
134 | NULL, | |
135 | }; | |
136 | ||
f8dae531 MN |
137 | struct gfs_configuration { |
138 | struct usb_configuration c; | |
139 | int (*eth)(struct usb_configuration *c, u8 *ethaddr); | |
140 | } gfs_configurations[] = { | |
c6c56008 | 141 | #ifdef CONFIG_USB_FUNCTIONFS_RNDIS |
f8dae531 MN |
142 | { |
143 | .eth = rndis_bind_config, | |
144 | }, | |
c6c56008 MN |
145 | #endif |
146 | ||
c6c56008 | 147 | #ifdef CONFIG_USB_FUNCTIONFS_ETH |
f8dae531 MN |
148 | { |
149 | .eth = eth_bind_config, | |
150 | }, | |
c6c56008 MN |
151 | #endif |
152 | ||
c6c56008 | 153 | #ifdef CONFIG_USB_FUNCTIONFS_GENERIC |
f8dae531 MN |
154 | { |
155 | }, | |
c6c56008 | 156 | #endif |
f8dae531 | 157 | }; |
c6c56008 | 158 | |
c6c56008 MN |
159 | static int gfs_bind(struct usb_composite_dev *cdev); |
160 | static int gfs_unbind(struct usb_composite_dev *cdev); | |
f8dae531 | 161 | static int gfs_do_config(struct usb_configuration *c); |
c6c56008 | 162 | |
c2ec75c2 | 163 | static __refdata struct usb_composite_driver gfs_driver = { |
fc19de61 | 164 | .name = DRIVER_NAME, |
c6c56008 MN |
165 | .dev = &gfs_dev_desc, |
166 | .strings = gfs_dev_strings, | |
35a0e0bf | 167 | .max_speed = USB_SPEED_HIGH, |
03e42bd5 | 168 | .bind = gfs_bind, |
c6c56008 | 169 | .unbind = gfs_unbind, |
fc19de61 | 170 | .iProduct = DRIVER_DESC, |
c6c56008 MN |
171 | }; |
172 | ||
581791f5 AP |
173 | static DEFINE_MUTEX(gfs_lock); |
174 | static unsigned int missing_funcs; | |
175 | static bool gfs_ether_setup; | |
176 | static bool gfs_registered; | |
177 | static bool gfs_single_func; | |
178 | static struct gfs_ffs_obj *ffs_tab; | |
c6c56008 | 179 | |
8545e603 | 180 | static int __init gfs_init(void) |
c6c56008 | 181 | { |
581791f5 AP |
182 | int i; |
183 | ||
c6c56008 MN |
184 | ENTER(); |
185 | ||
581791f5 AP |
186 | if (!func_num) { |
187 | gfs_single_func = true; | |
188 | func_num = 1; | |
189 | } | |
190 | ||
191 | ffs_tab = kcalloc(func_num, sizeof *ffs_tab, GFP_KERNEL); | |
192 | if (!ffs_tab) | |
193 | return -ENOMEM; | |
194 | ||
195 | if (!gfs_single_func) | |
196 | for (i = 0; i < func_num; i++) | |
197 | ffs_tab[i].name = func_names[i]; | |
198 | ||
199 | missing_funcs = func_num; | |
200 | ||
c6c56008 MN |
201 | return functionfs_init(); |
202 | } | |
203 | module_init(gfs_init); | |
204 | ||
8545e603 | 205 | static void __exit gfs_exit(void) |
c6c56008 MN |
206 | { |
207 | ENTER(); | |
581791f5 | 208 | mutex_lock(&gfs_lock); |
c6c56008 | 209 | |
581791f5 | 210 | if (gfs_registered) |
c6c56008 | 211 | usb_composite_unregister(&gfs_driver); |
581791f5 | 212 | gfs_registered = false; |
c6c56008 MN |
213 | |
214 | functionfs_cleanup(); | |
581791f5 AP |
215 | |
216 | mutex_unlock(&gfs_lock); | |
217 | kfree(ffs_tab); | |
c6c56008 MN |
218 | } |
219 | module_exit(gfs_exit); | |
220 | ||
581791f5 AP |
221 | static struct gfs_ffs_obj *gfs_find_dev(const char *dev_name) |
222 | { | |
223 | int i; | |
224 | ||
225 | ENTER(); | |
226 | ||
227 | if (gfs_single_func) | |
228 | return &ffs_tab[0]; | |
229 | ||
230 | for (i = 0; i < func_num; i++) | |
231 | if (strcmp(ffs_tab[i].name, dev_name) == 0) | |
232 | return &ffs_tab[i]; | |
233 | ||
234 | return NULL; | |
235 | } | |
236 | ||
c6c56008 MN |
237 | static int functionfs_ready_callback(struct ffs_data *ffs) |
238 | { | |
581791f5 | 239 | struct gfs_ffs_obj *ffs_obj; |
c6c56008 MN |
240 | int ret; |
241 | ||
242 | ENTER(); | |
581791f5 AP |
243 | mutex_lock(&gfs_lock); |
244 | ||
245 | ffs_obj = ffs->private_data; | |
246 | if (!ffs_obj) { | |
247 | ret = -EINVAL; | |
248 | goto done; | |
249 | } | |
250 | ||
251 | if (WARN_ON(ffs_obj->desc_ready)) { | |
252 | ret = -EBUSY; | |
253 | goto done; | |
254 | } | |
255 | ffs_obj->desc_ready = true; | |
256 | ffs_obj->ffs_data = ffs; | |
c6c56008 | 257 | |
581791f5 AP |
258 | if (--missing_funcs) { |
259 | ret = 0; | |
260 | goto done; | |
261 | } | |
262 | ||
263 | if (gfs_registered) { | |
264 | ret = -EBUSY; | |
265 | goto done; | |
266 | } | |
267 | gfs_registered = true; | |
c6c56008 | 268 | |
03e42bd5 | 269 | ret = usb_composite_probe(&gfs_driver); |
c6c56008 | 270 | if (unlikely(ret < 0)) |
581791f5 AP |
271 | gfs_registered = false; |
272 | ||
273 | done: | |
274 | mutex_unlock(&gfs_lock); | |
c6c56008 MN |
275 | return ret; |
276 | } | |
277 | ||
278 | static void functionfs_closed_callback(struct ffs_data *ffs) | |
279 | { | |
581791f5 AP |
280 | struct gfs_ffs_obj *ffs_obj; |
281 | ||
c6c56008 | 282 | ENTER(); |
581791f5 | 283 | mutex_lock(&gfs_lock); |
c6c56008 | 284 | |
581791f5 AP |
285 | ffs_obj = ffs->private_data; |
286 | if (!ffs_obj) | |
287 | goto done; | |
288 | ||
289 | ffs_obj->desc_ready = false; | |
290 | missing_funcs++; | |
291 | ||
292 | if (gfs_registered) | |
c6c56008 | 293 | usb_composite_unregister(&gfs_driver); |
581791f5 AP |
294 | gfs_registered = false; |
295 | ||
296 | done: | |
297 | mutex_unlock(&gfs_lock); | |
c6c56008 MN |
298 | } |
299 | ||
581791f5 | 300 | static void *functionfs_acquire_dev_callback(const char *dev_name) |
c6c56008 | 301 | { |
581791f5 AP |
302 | struct gfs_ffs_obj *ffs_dev; |
303 | ||
304 | ENTER(); | |
305 | mutex_lock(&gfs_lock); | |
306 | ||
307 | ffs_dev = gfs_find_dev(dev_name); | |
308 | if (!ffs_dev) { | |
309 | ffs_dev = ERR_PTR(-ENODEV); | |
310 | goto done; | |
311 | } | |
312 | ||
313 | if (ffs_dev->mounted) { | |
314 | ffs_dev = ERR_PTR(-EBUSY); | |
315 | goto done; | |
316 | } | |
317 | ffs_dev->mounted = true; | |
318 | ||
319 | done: | |
320 | mutex_unlock(&gfs_lock); | |
321 | return ffs_dev; | |
c6c56008 MN |
322 | } |
323 | ||
581791f5 AP |
324 | static void functionfs_release_dev_callback(struct ffs_data *ffs_data) |
325 | { | |
326 | struct gfs_ffs_obj *ffs_dev; | |
327 | ||
328 | ENTER(); | |
329 | mutex_lock(&gfs_lock); | |
330 | ||
331 | ffs_dev = ffs_data->private_data; | |
332 | if (ffs_dev) | |
333 | ffs_dev->mounted = false; | |
334 | ||
335 | mutex_unlock(&gfs_lock); | |
336 | } | |
337 | ||
338 | /* | |
339 | * It is assumed that gfs_bind is called from a context where gfs_lock is held | |
340 | */ | |
c6c56008 MN |
341 | static int gfs_bind(struct usb_composite_dev *cdev) |
342 | { | |
f8dae531 | 343 | int ret, i; |
c6c56008 MN |
344 | |
345 | ENTER(); | |
346 | ||
581791f5 | 347 | if (missing_funcs) |
c6c56008 MN |
348 | return -ENODEV; |
349 | ||
350 | ret = gether_setup(cdev->gadget, gfs_hostaddr); | |
351 | if (unlikely(ret < 0)) | |
352 | goto error_quick; | |
581791f5 | 353 | gfs_ether_setup = true; |
c6c56008 | 354 | |
f8dae531 | 355 | ret = usb_string_ids_tab(cdev, gfs_strings); |
c6c56008 MN |
356 | if (unlikely(ret < 0)) |
357 | goto error; | |
c6c56008 | 358 | |
581791f5 AP |
359 | for (i = func_num; --i; ) { |
360 | ret = functionfs_bind(ffs_tab[i].ffs_data, cdev); | |
361 | if (unlikely(ret < 0)) { | |
362 | while (++i < func_num) | |
363 | functionfs_unbind(ffs_tab[i].ffs_data); | |
364 | goto error; | |
365 | } | |
366 | } | |
c6c56008 | 367 | |
f8dae531 MN |
368 | for (i = 0; i < ARRAY_SIZE(gfs_configurations); ++i) { |
369 | struct gfs_configuration *c = gfs_configurations + i; | |
c6c56008 | 370 | |
fc19de61 MN |
371 | c->c.label = gfs_strings[i].s; |
372 | c->c.iConfiguration = gfs_strings[i].id; | |
f8dae531 MN |
373 | c->c.bConfigurationValue = 1 + i; |
374 | c->c.bmAttributes = USB_CONFIG_ATT_SELFPOWER; | |
c6c56008 | 375 | |
c9bfff9c | 376 | ret = usb_add_config(cdev, &c->c, gfs_do_config); |
f8dae531 MN |
377 | if (unlikely(ret < 0)) |
378 | goto error_unbind; | |
379 | } | |
c6c56008 MN |
380 | |
381 | return 0; | |
382 | ||
383 | error_unbind: | |
581791f5 AP |
384 | for (i = 0; i < func_num; i++) |
385 | functionfs_unbind(ffs_tab[i].ffs_data); | |
c6c56008 MN |
386 | error: |
387 | gether_cleanup(); | |
388 | error_quick: | |
581791f5 | 389 | gfs_ether_setup = false; |
c6c56008 MN |
390 | return ret; |
391 | } | |
392 | ||
581791f5 AP |
393 | /* |
394 | * It is assumed that gfs_unbind is called from a context where gfs_lock is held | |
395 | */ | |
c6c56008 MN |
396 | static int gfs_unbind(struct usb_composite_dev *cdev) |
397 | { | |
581791f5 AP |
398 | int i; |
399 | ||
c6c56008 MN |
400 | ENTER(); |
401 | ||
fc19de61 MN |
402 | /* |
403 | * We may have been called in an error recovery from | |
c6c56008 MN |
404 | * composite_bind() after gfs_unbind() failure so we need to |
405 | * check if gfs_ffs_data is not NULL since gfs_bind() handles | |
406 | * all error recovery itself. I'd rather we werent called | |
407 | * from composite on orror recovery, but what you're gonna | |
fc19de61 MN |
408 | * do...? |
409 | */ | |
581791f5 | 410 | if (gfs_ether_setup) |
c6c56008 | 411 | gether_cleanup(); |
581791f5 AP |
412 | gfs_ether_setup = false; |
413 | ||
414 | for (i = func_num; --i; ) | |
415 | if (ffs_tab[i].ffs_data) | |
416 | functionfs_unbind(ffs_tab[i].ffs_data); | |
c6c56008 MN |
417 | |
418 | return 0; | |
419 | } | |
420 | ||
581791f5 AP |
421 | /* |
422 | * It is assumed that gfs_do_config is called from a context where | |
423 | * gfs_lock is held | |
424 | */ | |
f8dae531 | 425 | static int gfs_do_config(struct usb_configuration *c) |
c6c56008 | 426 | { |
f8dae531 MN |
427 | struct gfs_configuration *gc = |
428 | container_of(c, struct gfs_configuration, c); | |
581791f5 | 429 | int i; |
c6c56008 MN |
430 | int ret; |
431 | ||
581791f5 | 432 | if (missing_funcs) |
c6c56008 MN |
433 | return -ENODEV; |
434 | ||
435 | if (gadget_is_otg(c->cdev->gadget)) { | |
436 | c->descriptors = gfs_otg_desc; | |
437 | c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
438 | } | |
439 | ||
f8dae531 MN |
440 | if (gc->eth) { |
441 | ret = gc->eth(c, gfs_hostaddr); | |
c6c56008 MN |
442 | if (unlikely(ret < 0)) |
443 | return ret; | |
444 | } | |
445 | ||
581791f5 AP |
446 | for (i = 0; i < func_num; i++) { |
447 | ret = functionfs_bind_config(c->cdev, c, ffs_tab[i].ffs_data); | |
448 | if (unlikely(ret < 0)) | |
449 | return ret; | |
450 | } | |
c6c56008 | 451 | |
fc19de61 MN |
452 | /* |
453 | * After previous do_configs there may be some invalid | |
f588c0db MN |
454 | * pointers in c->interface array. This happens every time |
455 | * a user space function with fewer interfaces than a user | |
456 | * space function that was run before the new one is run. The | |
457 | * compasit's set_config() assumes that if there is no more | |
458 | * then MAX_CONFIG_INTERFACES interfaces in a configuration | |
459 | * then there is a NULL pointer after the last interface in | |
fc19de61 MN |
460 | * c->interface array. We need to make sure this is true. |
461 | */ | |
f588c0db MN |
462 | if (c->next_interface_id < ARRAY_SIZE(c->interface)) |
463 | c->interface[c->next_interface_id] = NULL; | |
464 | ||
c6c56008 MN |
465 | return 0; |
466 | } | |
467 | ||
c6c56008 | 468 | #ifdef CONFIG_USB_FUNCTIONFS_ETH |
fc19de61 | 469 | |
f8dae531 | 470 | static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]) |
c6c56008 | 471 | { |
f8dae531 MN |
472 | return can_support_ecm(c->cdev->gadget) |
473 | ? ecm_bind_config(c, ethaddr) | |
474 | : geth_bind_config(c, ethaddr); | |
c6c56008 | 475 | } |
fc19de61 | 476 | |
c6c56008 | 477 | #endif |