tools/bcharge.cc

   1 ///
   2 /// \file       bcharge.cc
   3 ///             Talk to the Blackberry just enough to change the Max Power
   4 ///             to 500mA.  Cycles through all devices attached to USB,
   5 ///             attempting to set all matching Blackberry devices to charge.
   6 ///
   7 ///             This file is part of the Barry project:
   8 ///
   9 ///             http://www.netdirect.ca/software/packages/barry/index.php
  10 ///             http://sourceforge.net/projects/barry
  11 ///
  12 ///             Compile with the following command (needs libusb):
  13 ///
  14 ///             g++ -o bcharge bcharge.cc -lusb
  15 ///
  16
  17 /*
  18     Copyright (C) 2006-2009, Net Direct Inc. (http://www.netdirect.ca/)
  19
  20     This program is free software; you can redistribute it and/or modify
  21     it under the terms of the GNU General Public License as published by
  22     the Free Software Foundation; either version 2 of the License, or
  23     (at your option) any later version.
  24
  25     This program is distributed in the hope that it will be useful,
  26     but WITHOUT ANY WARRANTY; without even the implied warranty of
  27     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  28
  29     See the GNU General Public License in the COPYING file at the
  30     root directory of this project for more details.
  31 */
  32
  33 #include <usb.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <unistd.h>
  37 #include <errno.h>
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <fcntl.h>
  41 #include <string>
  42 #include <barry/common.h>
  43
  44 bool old_style_pearl = false;
  45 bool force_dual = false;
  46 std::string udev_devpath;
  47 std::string sysfs_path = "/sys";
  48
  49 void Usage()
  50 {
  51         printf(
  52         "bcharge - Adjust Blackberry charging modes\n"
  53         "          Copyright 2006-2009, Net Direct Inc. (http://www.netdirect.ca/)\n"
  54         "\n"
  55         "   -d          Dual mode (mode 0004) (default)\n"
  56         "   -o          Set a Pearl to old Blackberry mode (0001)\n"
  57         "\n"
  58         "   -h          This help message\n"
  59         "   -p devpath  The devpath argument from udev.  If specified, will attempt\n"
  60         "               to adjust USB suspend settings to keep the device charging.\n"
  61         "   -s path     The path where sysfs is mounted.  Defaults to '/sys'\n"
  62         "\n"
  63         );
  64 }
  65
  66 void control(usb_dev_handle *dev, int requesttype, int request, int value,
  67         int index, char *bytes, int size, int timeout)
  68 {
  69         int result = usb_control_msg(dev, requesttype, request, value, index,
  70                 bytes, size, timeout);
  71         if( result < 0 ) {
  72                 printf("\nusb_control_msg failed: code: %d, %s\n", result,
  73                         usb_strerror());
  74         }
  75 }
  76
  77 void charge(struct usb_dev_handle *handle)
  78 {
  79         // the special sauce... these steps seem to do the trick
  80         // for the 7750 series... needs testing on others
  81         char buffer[2];
  82         control(handle, 0xc0, 0xa5, 0, 1, buffer, 2, 100);
  83         control(handle, 0x40, 0xa2, 0, 1, buffer, 0, 100);
  84 }
  85
  86 void pearl_mode(struct usb_dev_handle *handle)
  87 {
  88         char buffer[2];
  89         if( old_style_pearl ) {
  90                 // use this for "old style" interface: product ID 0001
  91                 control(handle, 0xc0, 0xa9, 0, 1, buffer, 2, 100);
  92         }
  93         else {
  94                 // Product ID 0004
  95                 control(handle, 0xc0, 0xa9, 1, 1, buffer, 2, 100);
  96         }
  97 }
  98
  99 int find_mass_storage_interface(struct usb_dev_handle *handle)
 100 {
 101         // search the configuration descriptor for a Mass Storage
 102         // interface (class 8)
 103         struct usb_device *dev = usb_device(handle);
 104         struct usb_config_descriptor *cfg = dev ? dev->config : 0;
 105
 106         if( cfg ) {
 107
 108                 for( unsigned i = 0; cfg->interface && i < cfg->bNumInterfaces; i++ ) {
 109                         struct usb_interface *iface = &cfg->interface[i];
 110                         for( int a = 0; iface->altsetting && a < iface->num_altsetting; a++ ) {
 111                                 struct usb_interface_descriptor *id = &iface->altsetting[a];
 112                                 if( id->bInterfaceClass == USB_CLASS_MASS_STORAGE )
 113                                         return id->bInterfaceNumber;
 114                         }
 115                 }
 116         }
 117
 118         // if we get here, then we didn't find the Mass Storage interface
 119         // ... this should never happen, but if it does, assume
 120         // the device is s showing product ID 0006, and the Mass Storage
 121         // interface is interface #0
 122         printf("Can't find Mass Storage interface, assuming 0.\n");
 123         return 0;
 124 }
 125
 126 void driver_conflict(struct usb_dev_handle *handle)
 127 {
 128         // this is called if the first usb_set_configuration()
 129         // failed... this most probably means that usb_storage
 130         // has already claimed the Mass Storage interface,
 131         // in which case we politely tell it to away.
 132
 133 #if LIBUSB_HAS_DETACH_KERNEL_DRIVER_NP
 134         printf("Detecting possible kernel driver conflict, trying to resolve...\n");
 135
 136         int iface = find_mass_storage_interface(handle);
 137         if( usb_detach_kernel_driver_np(handle, iface) < 0 )
 138                 printf("usb_detach_kernel_driver_np() failed: %s\n", usb_strerror());
 139
 140         if( usb_set_configuration(handle, BLACKBERRY_CONFIGURATION) < 0 )
 141                 printf("usb_set_configuration() failed: %s\n", usb_strerror());
 142 #endif
 143 }
 144
 145 // returns true if device mode was modified, false otherwise
 146 bool process(struct usb_device *dev, bool is_pearl)
 147 {
 148         bool apply = false;
 149         printf("Found device #%s...", dev->filename);
 150
 151         // open
 152         usb_dev_handle *handle = usb_open(dev);
 153         if( !handle ) {
 154                 printf("unable to open device\n");
 155                 return false;
 156         }
 157
 158         // adjust power
 159         if( dev->config &&
 160             dev->descriptor.bNumConfigurations >= 1 &&
 161             dev->config[0].MaxPower < 250 ) {
 162                 printf("adjusting charge setting");
 163                 charge(handle);
 164                 apply = true;
 165         }
 166         else {
 167                 printf("already at 500mA");
 168         }
 169
 170         // adjust Pearl mode
 171         if( is_pearl || force_dual ) {
 172                 int desired_mode = old_style_pearl
 173                         ? PRODUCT_RIM_BLACKBERRY : PRODUCT_RIM_PEARL_DUAL;
 174
 175                 if( desired_mode != dev->descriptor.idProduct ) {
 176                         printf("...adjusting Pearl mode to %s",
 177                                 old_style_pearl ? "single" : "dual");
 178                         pearl_mode(handle);
 179                         apply = true;
 180                 }
 181                 else {
 182                         printf("...already in desired Pearl mode");
 183                 }
 184         }
 185         else {
 186                 printf("...no Pearl adjustment");
 187         }
 188
 189         // apply changes
 190         if( apply ) {
 191                 if( usb_set_configuration(handle, BLACKBERRY_CONFIGURATION) < 0 )
 192                         driver_conflict(handle);
 193
 194                 // the Blackberry Pearl doesn't reset itself after the above,
 195                 // so do it ourselves
 196                 if( is_pearl || force_dual ) {
 197                         //
 198                         // It has been observed that the 8830 behaves both like
 199                         // a Pearl device (in that it has mass storage +
 200                         // database modes) as well as a Classic device in
 201                         // that it resets itself and doesn't need an explicit
 202                         // reset call.
 203                         //
 204                         // In order to deal with this, we insert a brief sleep.
 205                         // If it is an 8830, it will reset itself and the
 206                         // following reset call will fail.  If it is a Pearl,
 207                         // the reset will work as normal.
 208                         //
 209                         sleep(1);
 210                         if( usb_reset(handle) < 0 ) {
 211                                 printf("\nusb_reset failed: %s\n", usb_strerror());
 212                         }
 213                 }
 214
 215                 printf("...done\n");
 216         }
 217         else {
 218                 printf("...no change\n");
 219         }
 220
 221         // cleanup
 222         usb_close(handle);
 223         return apply;
 224 }
 225
 226 bool power_write(const std::string &file, const std::string &value)
 227 {
 228         // attempt to open the state file
 229         int fd = open(file.c_str(), O_RDWR);
 230         if( fd == -1 ) {
 231                 printf("autosuspend adjustment failure: (file: %s): %s\n",
 232                         file.c_str(),
 233                         strerror(errno));
 234                 return false;
 235         }
 236
 237         int written = write(fd, value.data(), value.size());
 238         int error = errno;
 239         close(fd);
 240
 241         if( written < 0 || (size_t)written != value.size() ) {
 242                 printf("autosuspend adjustment failure (write): (file: %s): %s\n",
 243                         file.c_str(),
 244                         strerror(error));
 245                 return false;
 246         }
 247
 248         printf("autosuspend adjustment: wrote %s to %s\n",
 249                 value.c_str(), file.c_str());
 250         return true;
 251 }
 252
 253 //
 254 // Checks for USB suspend, and enables the device if suspended.
 255 //
 256 // Kernel 2.6.21 behaves with autosuspend=0 meaning off, while 2.6.22
 257 // and higher needs autosuspend=-1 to turn it off.  In 2.6.22, a value
 258 // of 0 means "immediate" instead of "never".
 259 //
 260 // Version 2.6.22 adds variables internal to the system called
 261 // autosuspend_disabled and autoresume_disabled.  These are controlled by the
 262 // /sys/class/usb_device/*/device/power/level file.  (See below)
 263 //
 264 // Here's a summary of files under device/power.  These may or may not exist
 265 // depending on your kernel version and configuration.
 266 //
 267 //
 268 //        autosuspend
 269 //                -1 or 0 means off, depending on kernel,
 270 //                otherwise it is the number of seconds to
 271 //                autosuspend
 272 //
 273 //        level
 274 //                with the settings:
 275 //
 276 //                on      - suspend is disabled, device is fully powered
 277 //                auto    - suspend is controlled by the kernel (default)
 278 //                suspend - suspend is enabled permanently
 279 //
 280 //                You can write these strings to the file to control
 281 //                behaviour on a per-device basis.
 282 //
 283 //                echo on > /sys/usb_device/.../device/power/level
 284 //
 285 //        state
 286 //                current state of device
 287 //                0 - fully powered
 288 //                2 - suspended
 289 //
 290 //                You can write these numbers to control behaviour, but
 291 //                any change you make here might change automatically
 292 //                if autosuspend is on.
 293 //
 294 //                echo -n 0 > /sys/usb_device/.../device/power/state
 295 //
 296 //        wakeup
 297 //                unknown
 298 //
 299 //
 300 // Given the above facts, use the following heuristics to try to disable
 301 // autosuspend for the Blackberry:
 302 //
 303 //      - if level exists, write "on" to it
 304 //      - if autosuspend exists, write -1 to it
 305 //              - if error, write 0 to it
 306 //      - if neither of the above work, and state exists, write 0 to it
 307 //
 308 void resume()
 309 {
 310         if( udev_devpath.size() == 0 )
 311                 return; // nothing to do
 312
 313         // let sysfs settle a bit
 314         sleep(5);
 315
 316         std::string power_path = sysfs_path + "/" + udev_devpath + "/device/power/";
 317
 318         if( !power_write(power_path + "level", "on\n") )
 319                 if( !power_write(power_path + "autosuspend", "-1\n") )
 320                         if( !power_write(power_path + "autosuspend", "0\n") )
 321                                 power_write(power_path + "state", "0");
 322 }
 323
 324 int main(int argc, char *argv[])
 325 {
 326         struct usb_bus *busses;
 327
 328         //
 329         // allow -o command line switch to choose which mode to use for
 330         // Blackberry Pearls:
 331         //      Dual(default):  0004    -d
 332         //      With switch:    0001    -o
 333         //
 334
 335         // process command line options
 336         for(;;) {
 337                 int cmd = getopt(argc, argv, "dop:s:h");
 338                 if( cmd == -1 )
 339                         break;
 340
 341                 switch( cmd )
 342                 {
 343                 case 'd':       // Dual (default)
 344                         force_dual = true;
 345                         old_style_pearl = false;
 346                         break;
 347
 348                 case 'o':       // Old style pearl
 349                         force_dual = false;
 350                         old_style_pearl = true;
 351                         break;
 352
 353                 case 'p':       // udev devpath
 354                         udev_devpath = optarg;
 355                         break;
 356
 357                 case 's':       // where sysfs is mounted
 358                         sysfs_path = optarg;
 359                         break;
 360
 361                 case 'h':       // help!
 362                 default:
 363                         Usage();
 364                         return 0;
 365                 }
 366         }
 367
 368         usb_init();
 369         if( usb_find_busses() < 0 || usb_find_devices() < 0 ) {
 370                 printf("\nUnable to scan devices: %s\n", usb_strerror());
 371                 return 1;
 372         }
 373         busses = usb_get_busses();
 374
 375         printf("Scanning for Blackberry devices...\n");
 376
 377         struct usb_bus *bus;
 378         for( bus = busses; bus; bus = bus->next ) {
 379                 struct usb_device *dev;
 380
 381                 for (dev = bus->devices; dev; dev = dev->next) {
 382                         // Is this a blackberry?
 383                         if( dev->descriptor.idVendor == VENDOR_RIM ) {
 384                                 switch(dev->descriptor.idProduct)
 385                                 {
 386                                 case PRODUCT_RIM_BLACKBERRY:
 387                                         if( !process(dev, false) )
 388                                                 resume();
 389                                         break;
 390
 391                                 case PRODUCT_RIM_PEARL_DUAL:
 392                                 case PRODUCT_RIM_PEARL:
 393                                 case PRODUCT_RIM_PEARL_8120:
 394                                 case PRODUCT_RIM_STORM:
 395                                         if( !process(dev, true) )
 396                                                 resume();
 397                                         break;
 398                                 }
 399                         }
 400                 }
 401         }
 402 }
 403