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 static const struct usb_descriptor_header *otg_desc[2];
 125
 126 /* string IDs are assigned dynamically */
 127 /* default serial number takes at least two packets */
 128 static char serial[] = "0123456789.0123456789.0123456789";
 129
 130 #define USB_GZERO_SS_DESC       (USB_GADGET_FIRST_AVAIL_IDX + 0)
 131 #define USB_GZERO_LB_DESC       (USB_GADGET_FIRST_AVAIL_IDX + 1)
 132
 133 static struct usb_string strings_dev[] = {
 134         [USB_GADGET_MANUFACTURER_IDX].s = "",
 135         [USB_GADGET_PRODUCT_IDX].s = longname,
 136         [USB_GADGET_SERIAL_IDX].s = serial,
 137         [USB_GZERO_SS_DESC].s   = "source and sink data",
 138         [USB_GZERO_LB_DESC].s   = "loop input to output",
 139         {  }                    /* end of list */
 140 };
 141
 142 static struct usb_gadget_strings stringtab_dev = {
 143         .language       = 0x0409,       /* en-us */
 144         .strings        = strings_dev,
 145 };
 146
 147 static struct usb_gadget_strings *dev_strings[] = {
 148         &stringtab_dev,
 149         NULL,
 150 };
 151
 152 /*-------------------------------------------------------------------------*/
 153
 154 static struct timer_list        autoresume_timer;
 155
 156 static void zero_autoresume(unsigned long _c)
 157 {
 158         struct usb_composite_dev        *cdev = (void *)_c;
 159         struct usb_gadget               *g = cdev->gadget;
 160
 161         /* unconfigured devices can't issue wakeups */
 162         if (!cdev->config)
 163                 return;
 164
 165         /* Normally the host would be woken up for something
 166          * more significant than just a timer firing; likely
 167          * because of some direct user request.
 168          */
 169         if (g->speed != USB_SPEED_UNKNOWN) {
 170                 int status = usb_gadget_wakeup(g);
 171                 INFO(cdev, "%s --> %d\n", __func__, status);
 172         }
 173 }
 174
 175 static void zero_suspend(struct usb_composite_dev *cdev)
 176 {
 177         if (cdev->gadget->speed == USB_SPEED_UNKNOWN)
 178                 return;
 179
 180         if (autoresume) {
 181                 if (max_autoresume &&
 182                         (autoresume_step_ms > max_autoresume * 1000))
 183                                 autoresume_step_ms = autoresume * 1000;
 184
 185                 mod_timer(&autoresume_timer, jiffies +
 186                         msecs_to_jiffies(autoresume_step_ms));
 187                 DBG(cdev, "suspend, wakeup in %d milliseconds\n",
 188                         autoresume_step_ms);
 189
 190                 autoresume_step_ms += autoresume_interval_ms;
 191         } else
 192                 DBG(cdev, "%s\n", __func__);
 193 }
 194
 195 static void zero_resume(struct usb_composite_dev *cdev)
 196 {
 197         DBG(cdev, "%s\n", __func__);
 198         del_timer(&autoresume_timer);
 199 }
 200
 201 /*-------------------------------------------------------------------------*/
 202
 203 static struct usb_configuration loopback_driver = {
 204         .label          = "loopback",
 205         .bConfigurationValue = 2,
 206         .bmAttributes   = USB_CONFIG_ATT_SELFPOWER,
 207         /* .iConfiguration = DYNAMIC */
 208 };
 209
 210 static struct usb_function *func_ss;
 211 static struct usb_function_instance *func_inst_ss;
 212
 213 static int ss_config_setup(struct usb_configuration *c,
 214                 const struct usb_ctrlrequest *ctrl)
 215 {
 216         switch (ctrl->bRequest) {
 217         case 0x5b:
 218         case 0x5c:
 219                 return func_ss->setup(func_ss, ctrl);
 220         default:
 221                 return -EOPNOTSUPP;
 222         }
 223 }
 224
 225 static struct usb_configuration sourcesink_driver = {
 226         .label                  = "source/sink",
 227         .setup                  = ss_config_setup,
 228         .bConfigurationValue    = 3,
 229         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 230         /* .iConfiguration      = DYNAMIC */
 231 };
 232
 233 module_param_named(buflen, gzero_options.bulk_buflen, uint, 0);
 234 module_param_named(pattern, gzero_options.pattern, uint, S_IRUGO|S_IWUSR);
 235 MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63, 2 = none");
 236
 237 module_param_named(isoc_interval, gzero_options.isoc_interval, uint,
 238                 S_IRUGO|S_IWUSR);
 239 MODULE_PARM_DESC(isoc_interval, "1 - 16");
 240
 241 module_param_named(isoc_maxpacket, gzero_options.isoc_maxpacket, uint,
 242                 S_IRUGO|S_IWUSR);
 243 MODULE_PARM_DESC(isoc_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
 244
 245 module_param_named(isoc_mult, gzero_options.isoc_mult, uint, S_IRUGO|S_IWUSR);
 246 MODULE_PARM_DESC(isoc_mult, "0 - 2 (hs/ss only)");
 247
 248 module_param_named(isoc_maxburst, gzero_options.isoc_maxburst, uint,
 249                 S_IRUGO|S_IWUSR);
 250 MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
 251
 252 static struct usb_function *func_lb;
 253 static struct usb_function_instance *func_inst_lb;
 254
 255 module_param_named(qlen, gzero_options.qlen, uint, S_IRUGO|S_IWUSR);
 256 MODULE_PARM_DESC(qlen, "depth of loopback queue");
 257
 258 static int zero_bind(struct usb_composite_dev *cdev)
 259 {
 260         struct f_ss_opts        *ss_opts;
 261         struct f_lb_opts        *lb_opts;
 262         int                     status;
 263
 264         /* Allocate string descriptor numbers ... note that string
 265          * contents can be overridden by the composite_dev glue.
 266          */
 267         status = usb_string_ids_tab(cdev, strings_dev);
 268         if (status < 0)
 269                 return status;
 270
 271         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 272         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 273         device_desc.iSerialNumber = strings_dev[USB_GADGET_SERIAL_IDX].id;
 274
 275         setup_timer(&autoresume_timer, zero_autoresume, (unsigned long) cdev);
 276
 277         func_inst_ss = usb_get_function_instance("SourceSink");
 278         if (IS_ERR(func_inst_ss))
 279                 return PTR_ERR(func_inst_ss);
 280
 281         ss_opts =  container_of(func_inst_ss, struct f_ss_opts, func_inst);
 282         ss_opts->pattern = gzero_options.pattern;
 283         ss_opts->isoc_interval = gzero_options.isoc_interval;
 284         ss_opts->isoc_maxpacket = gzero_options.isoc_maxpacket;
 285         ss_opts->isoc_mult = gzero_options.isoc_mult;
 286         ss_opts->isoc_maxburst = gzero_options.isoc_maxburst;
 287         ss_opts->bulk_buflen = gzero_options.bulk_buflen;
 288
 289         func_ss = usb_get_function(func_inst_ss);
 290         if (IS_ERR(func_ss)) {
 291                 status = PTR_ERR(func_ss);
 292                 goto err_put_func_inst_ss;
 293         }
 294
 295         func_inst_lb = usb_get_function_instance("Loopback");
 296         if (IS_ERR(func_inst_lb)) {
 297                 status = PTR_ERR(func_inst_lb);
 298                 goto err_put_func_ss;
 299         }
 300
 301         lb_opts = container_of(func_inst_lb, struct f_lb_opts, func_inst);
 302         lb_opts->bulk_buflen = gzero_options.bulk_buflen;
 303         lb_opts->qlen = gzero_options.qlen;
 304
 305         func_lb = usb_get_function(func_inst_lb);
 306         if (IS_ERR(func_lb)) {
 307                 status = PTR_ERR(func_lb);
 308                 goto err_put_func_inst_lb;
 309         }
 310
 311         sourcesink_driver.iConfiguration = strings_dev[USB_GZERO_SS_DESC].id;
 312         loopback_driver.iConfiguration = strings_dev[USB_GZERO_LB_DESC].id;
 313
 314         /* support autoresume for remote wakeup testing */
 315         sourcesink_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
 316         loopback_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
 317         sourcesink_driver.descriptors = NULL;
 318         loopback_driver.descriptors = NULL;
 319         if (autoresume) {
 320                 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 321                 loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 322                 autoresume_step_ms = autoresume * 1000;
 323         }
 324
 325         /* support OTG systems */
 326         if (gadget_is_otg(cdev->gadget)) {
 327                 if (!otg_desc[0]) {
 328                         struct usb_descriptor_header *usb_desc;
 329
 330                         usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
 331                         if (!usb_desc) {
 332                                 status = -ENOMEM;
 333                                 goto err_conf_flb;
 334                         }
 335                         usb_otg_descriptor_init(cdev->gadget, usb_desc);
 336                         otg_desc[0] = usb_desc;
 337                         otg_desc[1] = NULL;
 338                 }
 339                 sourcesink_driver.descriptors = otg_desc;
 340                 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 341                 loopback_driver.descriptors = otg_desc;
 342                 loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 343         }
 344
 345         /* Register primary, then secondary configuration.  Note that
 346          * SH3 only allows one config...
 347          */
 348         if (loopdefault) {
 349                 usb_add_config_only(cdev, &loopback_driver);
 350                 usb_add_config_only(cdev, &sourcesink_driver);
 351         } else {
 352                 usb_add_config_only(cdev, &sourcesink_driver);
 353                 usb_add_config_only(cdev, &loopback_driver);
 354         }
 355         status = usb_add_function(&sourcesink_driver, func_ss);
 356         if (status)
 357                 goto err_free_otg_desc;
 358
 359         usb_ep_autoconfig_reset(cdev->gadget);
 360         status = usb_add_function(&loopback_driver, func_lb);
 361         if (status)
 362                 goto err_free_otg_desc;
 363
 364         usb_ep_autoconfig_reset(cdev->gadget);
 365         usb_composite_overwrite_options(cdev, &coverwrite);
 366
 367         INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
 368
 369         return 0;
 370
 371 err_free_otg_desc:
 372         kfree(otg_desc[0]);
 373         otg_desc[0] = NULL;
 374 err_conf_flb:
 375         usb_put_function(func_lb);
 376         func_lb = NULL;
 377 err_put_func_inst_lb:
 378         usb_put_function_instance(func_inst_lb);
 379         func_inst_lb = NULL;
 380 err_put_func_ss:
 381         usb_put_function(func_ss);
 382         func_ss = NULL;
 383 err_put_func_inst_ss:
 384         usb_put_function_instance(func_inst_ss);
 385         func_inst_ss = NULL;
 386         return status;
 387 }
 388
 389 static int zero_unbind(struct usb_composite_dev *cdev)
 390 {
 391         del_timer_sync(&autoresume_timer);
 392         if (!IS_ERR_OR_NULL(func_ss))
 393                 usb_put_function(func_ss);
 394         usb_put_function_instance(func_inst_ss);
 395         if (!IS_ERR_OR_NULL(func_lb))
 396                 usb_put_function(func_lb);
 397         usb_put_function_instance(func_inst_lb);
 398         kfree(otg_desc[0]);
 399         otg_desc[0] = NULL;
 400
 401         return 0;
 402 }
 403
 404 static struct usb_composite_driver zero_driver = {
 405         .name           = "zero",
 406         .dev            = &device_desc,
 407         .strings        = dev_strings,
 408         .max_speed      = USB_SPEED_SUPER,
 409         .bind           = zero_bind,
 410         .unbind         = zero_unbind,
 411         .suspend        = zero_suspend,
 412         .resume         = zero_resume,
 413 };
 414
 415 module_usb_composite_driver(zero_driver);
 416
 417 MODULE_AUTHOR("David Brownell");
 418 MODULE_LICENSE("GPL");