drivers/usb/gadget/legacy/zero.c

   1 /*
   2  * zero.c -- Gadget Zero, for USB development
   3  *
   4  * Copyright (C) 2003-2008 David Brownell
   5  * Copyright (C) 2008 by Nokia Corporation
   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.
  11  */
  12
  13 /*
  14  * Gadget Zero only needs two bulk endpoints, and is an example of how you
  15  * can write a hardware-agnostic gadget driver running inside a USB device.
  16  * Some hardware details are visible, but don't affect most of the driver.
  17  *
  18  * Use it with the Linux host/master side "usbtest" driver to get a basic
  19  * functional test of your device-side usb stack, or with "usb-skeleton".
  20  *
  21  * It supports two similar configurations.  One sinks whatever the usb host
  22  * writes, and in return sources zeroes.  The other loops whatever the host
  23  * writes back, so the host can read it.
  24  *
  25  * Many drivers will only have one configuration, letting them be much
  26  * simpler if they also don't support high speed operation (like this
  27  * driver does).
  28  *
  29  * Why is *this* driver using two configurations, rather than setting up
  30  * two interfaces with different functions?  To help verify that multiple
  31  * configuration infrastructure is working correctly; also, so that it can
  32  * work with low capability USB controllers without four bulk endpoints.
  33  */
  34
  35 /*
  36  * driver assumes self-powered hardware, and
  37  * has no way for users to trigger remote wakeup.
  38  */
  39
  40 /* #define VERBOSE_DEBUG */
  41
  42 #include <linux/kernel.h>
  43 #include <linux/slab.h>
  44 #include <linux/device.h>
  45 #include <linux/module.h>
  46 #include <linux/err.h>
  47 #include <linux/usb/composite.h>
  48
  49 #include "g_zero.h"
  50 /*-------------------------------------------------------------------------*/
  51 USB_GADGET_COMPOSITE_OPTIONS();
  52
  53 #define DRIVER_VERSION          "Cinco de Mayo 2008"
  54
  55 static const char longname[] = "Gadget Zero";
  56
  57 /*
  58  * Normally the "loopback" configuration is second (index 1) so
  59  * it's not the default.  Here's where to change that order, to
  60  * work better with hosts where config changes are problematic or
  61  * controllers (like original superh) that only support one config.
  62  */
  63 static bool loopdefault = 0;
  64 module_param(loopdefault, bool, S_IRUGO|S_IWUSR);
  65
  66 static struct usb_zero_options gzero_options = {
  67         .isoc_interval = GZERO_ISOC_INTERVAL,
  68         .isoc_maxpacket = GZERO_ISOC_MAXPACKET,
  69         .bulk_buflen = GZERO_BULK_BUFLEN,
  70         .qlen = GZERO_QLEN,
  71 };
  72
  73 /*-------------------------------------------------------------------------*/
  74
  75 /* Thanks to NetChip Technologies for donating this product ID.
  76  *
  77  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
  78  * Instead:  allocate your own, using normal USB-IF procedures.
  79  */
  80 #ifndef CONFIG_USB_ZERO_HNPTEST
  81 #define DRIVER_VENDOR_NUM       0x0525          /* NetChip */
  82 #define DRIVER_PRODUCT_NUM      0xa4a0          /* Linux-USB "Gadget Zero" */
  83 #define DEFAULT_AUTORESUME      0
  84 #else
  85 #define DRIVER_VENDOR_NUM       0x1a0a          /* OTG test device IDs */
  86 #define DRIVER_PRODUCT_NUM      0xbadd
  87 #define DEFAULT_AUTORESUME      5
  88 #endif
  89
  90 /* If the optional "autoresume" mode is enabled, it provides good
  91  * functional coverage for the "USBCV" test harness from USB-IF.
  92  * It's always set if OTG mode is enabled.
  93  */
  94 static unsigned autoresume = DEFAULT_AUTORESUME;
  95 module_param(autoresume, uint, S_IRUGO);
  96 MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
  97
  98 /* Maximum Autoresume time */
  99 static unsigned max_autoresume;
 100 module_param(max_autoresume, uint, S_IRUGO);
 101 MODULE_PARM_DESC(max_autoresume, "maximum seconds before remote wakeup");
 102
 103 /* Interval between two remote wakeups */
 104 static unsigned autoresume_interval_ms;
 105 module_param(autoresume_interval_ms, uint, S_IRUGO);
 106 MODULE_PARM_DESC(autoresume_interval_ms,
 107                 "milliseconds to increase successive wakeup delays");
 108
 109 static unsigned autoresume_step_ms;
 110 /*-------------------------------------------------------------------------*/
 111
 112 static struct usb_device_descriptor device_desc = {
 113         .bLength =              sizeof device_desc,
 114         .bDescriptorType =      USB_DT_DEVICE,
 115
 116         .bcdUSB =               cpu_to_le16(0x0200),
 117         .bDeviceClass =         USB_CLASS_VENDOR_SPEC,
 118
 119         .idVendor =             cpu_to_le16(DRIVER_VENDOR_NUM),
 120         .idProduct =            cpu_to_le16(DRIVER_PRODUCT_NUM),
 121         .bNumConfigurations =   2,
 122 };
 123
 124 #ifdef CONFIG_USB_OTG
 125 static struct usb_otg_descriptor otg_descriptor = {
 126         .bLength =              sizeof otg_descriptor,
 127         .bDescriptorType =      USB_DT_OTG,
 128
 129         /* REVISIT SRP-only hardware is possible, although
 130          * it would not be called "OTG" ...
 131          */
 132         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
 133 };
 134
 135 static const struct usb_descriptor_header *otg_desc[] = {
 136         (struct usb_descriptor_header *) &otg_descriptor,
 137         NULL,
 138 };
 139 #else
 140 #define otg_desc        NULL
 141 #endif
 142
 143 /* string IDs are assigned dynamically */
 144 /* default serial number takes at least two packets */
 145 static char serial[] = "0123456789.0123456789.0123456789";
 146
 147 #define USB_GZERO_SS_DESC       (USB_GADGET_FIRST_AVAIL_IDX + 0)
 148 #define USB_GZERO_LB_DESC       (USB_GADGET_FIRST_AVAIL_IDX + 1)
 149
 150 static struct usb_string strings_dev[] = {
 151         [USB_GADGET_MANUFACTURER_IDX].s = "",
 152         [USB_GADGET_PRODUCT_IDX].s = longname,
 153         [USB_GADGET_SERIAL_IDX].s = serial,
 154         [USB_GZERO_SS_DESC].s   = "source and sink data",
 155         [USB_GZERO_LB_DESC].s   = "loop input to output",
 156         {  }                    /* end of list */
 157 };
 158
 159 static struct usb_gadget_strings stringtab_dev = {
 160         .language       = 0x0409,       /* en-us */
 161         .strings        = strings_dev,
 162 };
 163
 164 static struct usb_gadget_strings *dev_strings[] = {
 165         &stringtab_dev,
 166         NULL,
 167 };
 168
 169 /*-------------------------------------------------------------------------*/
 170
 171 static struct timer_list        autoresume_timer;
 172
 173 static void zero_autoresume(unsigned long _c)
 174 {
 175         struct usb_composite_dev        *cdev = (void *)_c;
 176         struct usb_gadget               *g = cdev->gadget;
 177
 178         /* unconfigured devices can't issue wakeups */
 179         if (!cdev->config)
 180                 return;
 181
 182         /* Normally the host would be woken up for something
 183          * more significant than just a timer firing; likely
 184          * because of some direct user request.
 185          */
 186         if (g->speed != USB_SPEED_UNKNOWN) {
 187                 int status = usb_gadget_wakeup(g);
 188                 INFO(cdev, "%s --> %d\n", __func__, status);
 189         }
 190 }
 191
 192 static void zero_suspend(struct usb_composite_dev *cdev)
 193 {
 194         if (cdev->gadget->speed == USB_SPEED_UNKNOWN)
 195                 return;
 196
 197         if (autoresume) {
 198                 if (max_autoresume &&
 199                         (autoresume_step_ms > max_autoresume * 1000))
 200                                 autoresume_step_ms = autoresume * 1000;
 201
 202                 mod_timer(&autoresume_timer, jiffies +
 203                         msecs_to_jiffies(autoresume_step_ms));
 204                 DBG(cdev, "suspend, wakeup in %d milliseconds\n",
 205                         autoresume_step_ms);
 206
 207                 autoresume_step_ms += autoresume_interval_ms;
 208         } else
 209                 DBG(cdev, "%s\n", __func__);
 210 }
 211
 212 static void zero_resume(struct usb_composite_dev *cdev)
 213 {
 214         DBG(cdev, "%s\n", __func__);
 215         del_timer(&autoresume_timer);
 216 }
 217
 218 /*-------------------------------------------------------------------------*/
 219
 220 static struct usb_configuration loopback_driver = {
 221         .label          = "loopback",
 222         .bConfigurationValue = 2,
 223         .bmAttributes   = USB_CONFIG_ATT_SELFPOWER,
 224         /* .iConfiguration = DYNAMIC */
 225 };
 226
 227 static struct usb_function *func_ss;
 228 static struct usb_function_instance *func_inst_ss;
 229
 230 static int ss_config_setup(struct usb_configuration *c,
 231                 const struct usb_ctrlrequest *ctrl)
 232 {
 233         switch (ctrl->bRequest) {
 234         case 0x5b:
 235         case 0x5c:
 236                 return func_ss->setup(func_ss, ctrl);
 237         default:
 238                 return -EOPNOTSUPP;
 239         }
 240 }
 241
 242 static struct usb_configuration sourcesink_driver = {
 243         .label                  = "source/sink",
 244         .setup                  = ss_config_setup,
 245         .bConfigurationValue    = 3,
 246         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 247         /* .iConfiguration      = DYNAMIC */
 248 };
 249
 250 module_param_named(buflen, gzero_options.bulk_buflen, uint, 0);
 251 module_param_named(pattern, gzero_options.pattern, uint, S_IRUGO|S_IWUSR);
 252 MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63, 2 = none");
 253
 254 module_param_named(isoc_interval, gzero_options.isoc_interval, uint,
 255                 S_IRUGO|S_IWUSR);
 256 MODULE_PARM_DESC(isoc_interval, "1 - 16");
 257
 258 module_param_named(isoc_maxpacket, gzero_options.isoc_maxpacket, uint,
 259                 S_IRUGO|S_IWUSR);
 260 MODULE_PARM_DESC(isoc_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
 261
 262 module_param_named(isoc_mult, gzero_options.isoc_mult, uint, S_IRUGO|S_IWUSR);
 263 MODULE_PARM_DESC(isoc_mult, "0 - 2 (hs/ss only)");
 264
 265 module_param_named(isoc_maxburst, gzero_options.isoc_maxburst, uint,
 266                 S_IRUGO|S_IWUSR);
 267 MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
 268
 269 static struct usb_function *func_lb;
 270 static struct usb_function_instance *func_inst_lb;
 271
 272 module_param_named(qlen, gzero_options.qlen, uint, S_IRUGO|S_IWUSR);
 273 MODULE_PARM_DESC(qlen, "depth of loopback queue");
 274
 275 static int __init zero_bind(struct usb_composite_dev *cdev)
 276 {
 277         struct f_ss_opts        *ss_opts;
 278         struct f_lb_opts        *lb_opts;
 279         int                     status;
 280
 281         /* Allocate string descriptor numbers ... note that string
 282          * contents can be overridden by the composite_dev glue.
 283          */
 284         status = usb_string_ids_tab(cdev, strings_dev);
 285         if (status < 0)
 286                 return status;
 287
 288         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 289         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 290         device_desc.iSerialNumber = strings_dev[USB_GADGET_SERIAL_IDX].id;
 291
 292         setup_timer(&autoresume_timer, zero_autoresume, (unsigned long) cdev);
 293
 294         func_inst_ss = usb_get_function_instance("SourceSink");
 295         if (IS_ERR(func_inst_ss))
 296                 return PTR_ERR(func_inst_ss);
 297
 298         ss_opts =  container_of(func_inst_ss, struct f_ss_opts, func_inst);
 299         ss_opts->pattern = gzero_options.pattern;
 300         ss_opts->isoc_interval = gzero_options.isoc_interval;
 301         ss_opts->isoc_maxpacket = gzero_options.isoc_maxpacket;
 302         ss_opts->isoc_mult = gzero_options.isoc_mult;
 303         ss_opts->isoc_maxburst = gzero_options.isoc_maxburst;
 304         ss_opts->bulk_buflen = gzero_options.bulk_buflen;
 305
 306         func_ss = usb_get_function(func_inst_ss);
 307         if (IS_ERR(func_ss)) {
 308                 status = PTR_ERR(func_ss);
 309                 goto err_put_func_inst_ss;
 310         }
 311
 312         func_inst_lb = usb_get_function_instance("Loopback");
 313         if (IS_ERR(func_inst_lb)) {
 314                 status = PTR_ERR(func_inst_lb);
 315                 goto err_put_func_ss;
 316         }
 317
 318         lb_opts = container_of(func_inst_lb, struct f_lb_opts, func_inst);
 319         lb_opts->bulk_buflen = gzero_options.bulk_buflen;
 320         lb_opts->qlen = gzero_options.qlen;
 321
 322         func_lb = usb_get_function(func_inst_lb);
 323         if (IS_ERR(func_lb)) {
 324                 status = PTR_ERR(func_lb);
 325                 goto err_put_func_inst_lb;
 326         }
 327
 328         sourcesink_driver.iConfiguration = strings_dev[USB_GZERO_SS_DESC].id;
 329         loopback_driver.iConfiguration = strings_dev[USB_GZERO_LB_DESC].id;
 330
 331         /* support autoresume for remote wakeup testing */
 332         sourcesink_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
 333         loopback_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
 334         sourcesink_driver.descriptors = NULL;
 335         loopback_driver.descriptors = NULL;
 336         if (autoresume) {
 337                 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 338                 loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 339                 autoresume_step_ms = autoresume * 1000;
 340         }
 341
 342         /* support OTG systems */
 343         if (gadget_is_otg(cdev->gadget)) {
 344                 sourcesink_driver.descriptors = otg_desc;
 345                 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 346                 loopback_driver.descriptors = otg_desc;
 347                 loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 348         }
 349
 350         /* Register primary, then secondary configuration.  Note that
 351          * SH3 only allows one config...
 352          */
 353         if (loopdefault) {
 354                 usb_add_config_only(cdev, &loopback_driver);
 355                 usb_add_config_only(cdev, &sourcesink_driver);
 356         } else {
 357                 usb_add_config_only(cdev, &sourcesink_driver);
 358                 usb_add_config_only(cdev, &loopback_driver);
 359         }
 360         status = usb_add_function(&sourcesink_driver, func_ss);
 361         if (status)
 362                 goto err_conf_flb;
 363
 364         usb_ep_autoconfig_reset(cdev->gadget);
 365         status = usb_add_function(&loopback_driver, func_lb);
 366         if (status)
 367                 goto err_conf_flb;
 368
 369         usb_ep_autoconfig_reset(cdev->gadget);
 370         usb_composite_overwrite_options(cdev, &coverwrite);
 371
 372         INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
 373
 374         return 0;
 375
 376 err_conf_flb:
 377         usb_put_function(func_lb);
 378         func_lb = NULL;
 379 err_put_func_inst_lb:
 380         usb_put_function_instance(func_inst_lb);
 381         func_inst_lb = NULL;
 382 err_put_func_ss:
 383         usb_put_function(func_ss);
 384         func_ss = NULL;
 385 err_put_func_inst_ss:
 386         usb_put_function_instance(func_inst_ss);
 387         func_inst_ss = NULL;
 388         return status;
 389 }
 390
 391 static int zero_unbind(struct usb_composite_dev *cdev)
 392 {
 393         del_timer_sync(&autoresume_timer);
 394         if (!IS_ERR_OR_NULL(func_ss))
 395                 usb_put_function(func_ss);
 396         usb_put_function_instance(func_inst_ss);
 397         if (!IS_ERR_OR_NULL(func_lb))
 398                 usb_put_function(func_lb);
 399         usb_put_function_instance(func_inst_lb);
 400         return 0;
 401 }
 402
 403 static __refdata struct usb_composite_driver zero_driver = {
 404         .name           = "zero",
 405         .dev            = &device_desc,
 406         .strings        = dev_strings,
 407         .max_speed      = USB_SPEED_SUPER,
 408         .bind           = zero_bind,
 409         .unbind         = zero_unbind,
 410         .suspend        = zero_suspend,
 411         .resume         = zero_resume,
 412 };
 413
 414 module_usb_composite_driver(zero_driver);
 415
 416 MODULE_AUTHOR("David Brownell");
 417 MODULE_LICENSE("GPL");