drivers/usb/gadget/legacy/multi.c

   1 /*
   2  * multi.c -- Multifunction Composite driver
   3  *
   4  * Copyright (C) 2008 David Brownell
   5  * Copyright (C) 2008 Nokia Corporation
   6  * Copyright (C) 2009 Samsung Electronics
   7  * Author: Michal Nazarewicz (mina86@mina86.com)
   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
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/netdevice.h>
  19
  20 #include "u_serial.h"
  21 #if defined USB_ETH_RNDIS
  22 #  undef USB_ETH_RNDIS
  23 #endif
  24 #ifdef CONFIG_USB_G_MULTI_RNDIS
  25 #  define USB_ETH_RNDIS y
  26 #endif
  27
  28
  29 #define DRIVER_DESC             "Multifunction Composite Gadget"
  30
  31 MODULE_DESCRIPTION(DRIVER_DESC);
  32 MODULE_AUTHOR("Michal Nazarewicz");
  33 MODULE_LICENSE("GPL");
  34
  35
  36 #include "f_mass_storage.h"
  37
  38 #include "u_ecm.h"
  39 #ifdef USB_ETH_RNDIS
  40 #  include "u_rndis.h"
  41 #  include "rndis.h"
  42 #endif
  43 #include "u_ether.h"
  44
  45 USB_GADGET_COMPOSITE_OPTIONS();
  46
  47 USB_ETHERNET_MODULE_PARAMETERS();
  48
  49 /***************************** Device Descriptor ****************************/
  50
  51 #define MULTI_VENDOR_NUM        0x1d6b  /* Linux Foundation */
  52 #define MULTI_PRODUCT_NUM       0x0104  /* Multifunction Composite Gadget */
  53
  54
  55 enum {
  56         __MULTI_NO_CONFIG,
  57 #ifdef CONFIG_USB_G_MULTI_RNDIS
  58         MULTI_RNDIS_CONFIG_NUM,
  59 #endif
  60 #ifdef CONFIG_USB_G_MULTI_CDC
  61         MULTI_CDC_CONFIG_NUM,
  62 #endif
  63 };
  64
  65
  66 static struct usb_device_descriptor device_desc = {
  67         .bLength =              sizeof device_desc,
  68         .bDescriptorType =      USB_DT_DEVICE,
  69
  70         /* .bcdUSB = DYNAMIC */
  71
  72         .bDeviceClass =         USB_CLASS_MISC /* 0xEF */,
  73         .bDeviceSubClass =      2,
  74         .bDeviceProtocol =      1,
  75
  76         /* Vendor and product id can be overridden by module parameters.  */
  77         .idVendor =             cpu_to_le16(MULTI_VENDOR_NUM),
  78         .idProduct =            cpu_to_le16(MULTI_PRODUCT_NUM),
  79 };
  80
  81 static const struct usb_descriptor_header *otg_desc[2];
  82
  83 enum {
  84         MULTI_STRING_RNDIS_CONFIG_IDX = USB_GADGET_FIRST_AVAIL_IDX,
  85         MULTI_STRING_CDC_CONFIG_IDX,
  86 };
  87
  88 static struct usb_string strings_dev[] = {
  89         [USB_GADGET_MANUFACTURER_IDX].s = "",
  90         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
  91         [USB_GADGET_SERIAL_IDX].s = "",
  92         [MULTI_STRING_RNDIS_CONFIG_IDX].s = "Multifunction with RNDIS",
  93         [MULTI_STRING_CDC_CONFIG_IDX].s   = "Multifunction with CDC ECM",
  94         {  } /* end of list */
  95 };
  96
  97 static struct usb_gadget_strings *dev_strings[] = {
  98         &(struct usb_gadget_strings){
  99                 .language       = 0x0409,       /* en-us */
 100                 .strings        = strings_dev,
 101         },
 102         NULL,
 103 };
 104
 105
 106
 107
 108 /****************************** Configurations ******************************/
 109
 110 static struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
 111 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
 112
 113 static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;
 114
 115 #else
 116
 117 /*
 118  * Number of buffers we will use.
 119  * 2 is usually enough for good buffering pipeline
 120  */
 121 #define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
 122
 123 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
 124
 125 FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
 126
 127 static struct usb_function_instance *fi_acm;
 128 static struct usb_function_instance *fi_msg;
 129
 130 /********** RNDIS **********/
 131
 132 #ifdef USB_ETH_RNDIS
 133 static struct usb_function_instance *fi_rndis;
 134 static struct usb_function *f_acm_rndis;
 135 static struct usb_function *f_rndis;
 136 static struct usb_function *f_msg_rndis;
 137
 138 static int rndis_do_config(struct usb_configuration *c)
 139 {
 140         struct fsg_opts *fsg_opts;
 141         int ret;
 142
 143         if (gadget_is_otg(c->cdev->gadget)) {
 144                 c->descriptors = otg_desc;
 145                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 146         }
 147
 148         f_rndis = usb_get_function(fi_rndis);
 149         if (IS_ERR(f_rndis))
 150                 return PTR_ERR(f_rndis);
 151
 152         ret = usb_add_function(c, f_rndis);
 153         if (ret < 0)
 154                 goto err_func_rndis;
 155
 156         f_acm_rndis = usb_get_function(fi_acm);
 157         if (IS_ERR(f_acm_rndis)) {
 158                 ret = PTR_ERR(f_acm_rndis);
 159                 goto err_func_acm;
 160         }
 161
 162         ret = usb_add_function(c, f_acm_rndis);
 163         if (ret)
 164                 goto err_conf;
 165
 166         f_msg_rndis = usb_get_function(fi_msg);
 167         if (IS_ERR(f_msg_rndis)) {
 168                 ret = PTR_ERR(f_msg_rndis);
 169                 goto err_fsg;
 170         }
 171
 172         fsg_opts = fsg_opts_from_func_inst(fi_msg);
 173         ret = fsg_common_run_thread(fsg_opts->common);
 174         if (ret)
 175                 goto err_run;
 176
 177         ret = usb_add_function(c, f_msg_rndis);
 178         if (ret)
 179                 goto err_run;
 180
 181         return 0;
 182 err_run:
 183         usb_put_function(f_msg_rndis);
 184 err_fsg:
 185         usb_remove_function(c, f_acm_rndis);
 186 err_conf:
 187         usb_put_function(f_acm_rndis);
 188 err_func_acm:
 189         usb_remove_function(c, f_rndis);
 190 err_func_rndis:
 191         usb_put_function(f_rndis);
 192         return ret;
 193 }
 194
 195 static __ref int rndis_config_register(struct usb_composite_dev *cdev)
 196 {
 197         static struct usb_configuration config = {
 198                 .bConfigurationValue    = MULTI_RNDIS_CONFIG_NUM,
 199                 .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 200         };
 201
 202         config.label          = strings_dev[MULTI_STRING_RNDIS_CONFIG_IDX].s;
 203         config.iConfiguration = strings_dev[MULTI_STRING_RNDIS_CONFIG_IDX].id;
 204
 205         return usb_add_config(cdev, &config, rndis_do_config);
 206 }
 207
 208 #else
 209
 210 static __ref int rndis_config_register(struct usb_composite_dev *cdev)
 211 {
 212         return 0;
 213 }
 214
 215 #endif
 216
 217
 218 /********** CDC ECM **********/
 219
 220 #ifdef CONFIG_USB_G_MULTI_CDC
 221 static struct usb_function_instance *fi_ecm;
 222 static struct usb_function *f_acm_multi;
 223 static struct usb_function *f_ecm;
 224 static struct usb_function *f_msg_multi;
 225
 226 static int cdc_do_config(struct usb_configuration *c)
 227 {
 228         struct fsg_opts *fsg_opts;
 229         int ret;
 230
 231         if (gadget_is_otg(c->cdev->gadget)) {
 232                 c->descriptors = otg_desc;
 233                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 234         }
 235
 236         f_ecm = usb_get_function(fi_ecm);
 237         if (IS_ERR(f_ecm))
 238                 return PTR_ERR(f_ecm);
 239
 240         ret = usb_add_function(c, f_ecm);
 241         if (ret < 0)
 242                 goto err_func_ecm;
 243
 244         /* implicit port_num is zero */
 245         f_acm_multi = usb_get_function(fi_acm);
 246         if (IS_ERR(f_acm_multi)) {
 247                 ret = PTR_ERR(f_acm_multi);
 248                 goto err_func_acm;
 249         }
 250
 251         ret = usb_add_function(c, f_acm_multi);
 252         if (ret)
 253                 goto err_conf;
 254
 255         f_msg_multi = usb_get_function(fi_msg);
 256         if (IS_ERR(f_msg_multi)) {
 257                 ret = PTR_ERR(f_msg_multi);
 258                 goto err_fsg;
 259         }
 260
 261         fsg_opts = fsg_opts_from_func_inst(fi_msg);
 262         ret = fsg_common_run_thread(fsg_opts->common);
 263         if (ret)
 264                 goto err_run;
 265
 266         ret = usb_add_function(c, f_msg_multi);
 267         if (ret)
 268                 goto err_run;
 269
 270         return 0;
 271 err_run:
 272         usb_put_function(f_msg_multi);
 273 err_fsg:
 274         usb_remove_function(c, f_acm_multi);
 275 err_conf:
 276         usb_put_function(f_acm_multi);
 277 err_func_acm:
 278         usb_remove_function(c, f_ecm);
 279 err_func_ecm:
 280         usb_put_function(f_ecm);
 281         return ret;
 282 }
 283
 284 static __ref int cdc_config_register(struct usb_composite_dev *cdev)
 285 {
 286         static struct usb_configuration config = {
 287                 .bConfigurationValue    = MULTI_CDC_CONFIG_NUM,
 288                 .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 289         };
 290
 291         config.label          = strings_dev[MULTI_STRING_CDC_CONFIG_IDX].s;
 292         config.iConfiguration = strings_dev[MULTI_STRING_CDC_CONFIG_IDX].id;
 293
 294         return usb_add_config(cdev, &config, cdc_do_config);
 295 }
 296
 297 #else
 298
 299 static __ref int cdc_config_register(struct usb_composite_dev *cdev)
 300 {
 301         return 0;
 302 }
 303
 304 #endif
 305
 306
 307
 308 /****************************** Gadget Bind ******************************/
 309
 310 static int __ref multi_bind(struct usb_composite_dev *cdev)
 311 {
 312         struct usb_gadget *gadget = cdev->gadget;
 313 #ifdef CONFIG_USB_G_MULTI_CDC
 314         struct f_ecm_opts *ecm_opts;
 315 #endif
 316 #ifdef USB_ETH_RNDIS
 317         struct f_rndis_opts *rndis_opts;
 318 #endif
 319         struct fsg_opts *fsg_opts;
 320         struct fsg_config config;
 321         int status;
 322
 323         if (!can_support_ecm(cdev->gadget)) {
 324                 dev_err(&gadget->dev, "controller '%s' not usable\n",
 325                         gadget->name);
 326                 return -EINVAL;
 327         }
 328
 329 #ifdef CONFIG_USB_G_MULTI_CDC
 330         fi_ecm = usb_get_function_instance("ecm");
 331         if (IS_ERR(fi_ecm))
 332                 return PTR_ERR(fi_ecm);
 333
 334         ecm_opts = container_of(fi_ecm, struct f_ecm_opts, func_inst);
 335
 336         gether_set_qmult(ecm_opts->net, qmult);
 337         if (!gether_set_host_addr(ecm_opts->net, host_addr))
 338                 pr_info("using host ethernet address: %s", host_addr);
 339         if (!gether_set_dev_addr(ecm_opts->net, dev_addr))
 340                 pr_info("using self ethernet address: %s", dev_addr);
 341 #endif
 342
 343 #ifdef USB_ETH_RNDIS
 344         fi_rndis = usb_get_function_instance("rndis");
 345         if (IS_ERR(fi_rndis)) {
 346                 status = PTR_ERR(fi_rndis);
 347                 goto fail;
 348         }
 349
 350         rndis_opts = container_of(fi_rndis, struct f_rndis_opts, func_inst);
 351
 352         gether_set_qmult(rndis_opts->net, qmult);
 353         if (!gether_set_host_addr(rndis_opts->net, host_addr))
 354                 pr_info("using host ethernet address: %s", host_addr);
 355         if (!gether_set_dev_addr(rndis_opts->net, dev_addr))
 356                 pr_info("using self ethernet address: %s", dev_addr);
 357 #endif
 358
 359 #if (defined CONFIG_USB_G_MULTI_CDC && defined USB_ETH_RNDIS)
 360         /*
 361          * If both ecm and rndis are selected then:
 362          *      1) rndis borrows the net interface from ecm
 363          *      2) since the interface is shared it must not be bound
 364          *      twice - in ecm's _and_ rndis' binds, so do it here.
 365          */
 366         gether_set_gadget(ecm_opts->net, cdev->gadget);
 367         status = gether_register_netdev(ecm_opts->net);
 368         if (status)
 369                 goto fail0;
 370
 371         rndis_borrow_net(fi_rndis, ecm_opts->net);
 372         ecm_opts->bound = true;
 373 #endif
 374
 375         /* set up serial link layer */
 376         fi_acm = usb_get_function_instance("acm");
 377         if (IS_ERR(fi_acm)) {
 378                 status = PTR_ERR(fi_acm);
 379                 goto fail0;
 380         }
 381
 382         /* set up mass storage function */
 383         fi_msg = usb_get_function_instance("mass_storage");
 384         if (IS_ERR(fi_msg)) {
 385                 status = PTR_ERR(fi_msg);
 386                 goto fail1;
 387         }
 388         fsg_config_from_params(&config, &fsg_mod_data, fsg_num_buffers);
 389         fsg_opts = fsg_opts_from_func_inst(fi_msg);
 390
 391         fsg_opts->no_configfs = true;
 392         status = fsg_common_set_num_buffers(fsg_opts->common, fsg_num_buffers);
 393         if (status)
 394                 goto fail2;
 395
 396         status = fsg_common_set_cdev(fsg_opts->common, cdev, config.can_stall);
 397         if (status)
 398                 goto fail_set_cdev;
 399
 400         fsg_common_set_sysfs(fsg_opts->common, true);
 401         status = fsg_common_create_luns(fsg_opts->common, &config);
 402         if (status)
 403                 goto fail_set_cdev;
 404
 405         fsg_common_set_inquiry_string(fsg_opts->common, config.vendor_name,
 406                                       config.product_name);
 407
 408         /* allocate string IDs */
 409         status = usb_string_ids_tab(cdev, strings_dev);
 410         if (unlikely(status < 0))
 411                 goto fail_string_ids;
 412         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 413
 414         if (gadget_is_otg(gadget) && !otg_desc[0]) {
 415                 struct usb_descriptor_header *usb_desc;
 416
 417                 usb_desc = usb_otg_descriptor_alloc(gadget);
 418                 if (!usb_desc)
 419                         goto fail_string_ids;
 420                 usb_otg_descriptor_init(gadget, usb_desc);
 421                 otg_desc[0] = usb_desc;
 422                 otg_desc[1] = NULL;
 423         }
 424
 425         /* register configurations */
 426         status = rndis_config_register(cdev);
 427         if (unlikely(status < 0))
 428                 goto fail_otg_desc;
 429
 430         status = cdc_config_register(cdev);
 431         if (unlikely(status < 0))
 432                 goto fail_otg_desc;
 433         usb_composite_overwrite_options(cdev, &coverwrite);
 434
 435         /* we're done */
 436         dev_info(&gadget->dev, DRIVER_DESC "\n");
 437         return 0;
 438
 439
 440         /* error recovery */
 441 fail_otg_desc:
 442         kfree(otg_desc[0]);
 443         otg_desc[0] = NULL;
 444 fail_string_ids:
 445         fsg_common_remove_luns(fsg_opts->common);
 446 fail_set_cdev:
 447         fsg_common_free_buffers(fsg_opts->common);
 448 fail2:
 449         usb_put_function_instance(fi_msg);
 450 fail1:
 451         usb_put_function_instance(fi_acm);
 452 fail0:
 453 #ifdef USB_ETH_RNDIS
 454         usb_put_function_instance(fi_rndis);
 455 fail:
 456 #endif
 457 #ifdef CONFIG_USB_G_MULTI_CDC
 458         usb_put_function_instance(fi_ecm);
 459 #endif
 460         return status;
 461 }
 462
 463 static int multi_unbind(struct usb_composite_dev *cdev)
 464 {
 465 #ifdef CONFIG_USB_G_MULTI_CDC
 466         usb_put_function(f_msg_multi);
 467 #endif
 468 #ifdef USB_ETH_RNDIS
 469         usb_put_function(f_msg_rndis);
 470 #endif
 471         usb_put_function_instance(fi_msg);
 472 #ifdef CONFIG_USB_G_MULTI_CDC
 473         usb_put_function(f_acm_multi);
 474 #endif
 475 #ifdef USB_ETH_RNDIS
 476         usb_put_function(f_acm_rndis);
 477 #endif
 478         usb_put_function_instance(fi_acm);
 479 #ifdef USB_ETH_RNDIS
 480         usb_put_function(f_rndis);
 481         usb_put_function_instance(fi_rndis);
 482 #endif
 483 #ifdef CONFIG_USB_G_MULTI_CDC
 484         usb_put_function(f_ecm);
 485         usb_put_function_instance(fi_ecm);
 486 #endif
 487         kfree(otg_desc[0]);
 488         otg_desc[0] = NULL;
 489
 490         return 0;
 491 }
 492
 493
 494 /****************************** Some noise ******************************/
 495
 496
 497 static struct usb_composite_driver multi_driver = {
 498         .name           = "g_multi",
 499         .dev            = &device_desc,
 500         .strings        = dev_strings,
 501         .max_speed      = USB_SPEED_HIGH,
 502         .bind           = multi_bind,
 503         .unbind         = multi_unbind,
 504         .needs_serial   = 1,
 505 };
 506
 507 module_usb_composite_driver(multi_driver);