drivers/usb/gadget/g_ffs.c

   1 #include <linux/module.h>
   2 #include <linux/utsname.h>
   3
   4
   5 /*
   6  * kbuild is not very cooperative with respect to linking separately
   7  * compiled library objects into one module.  So for now we won't use
   8  * separate compilation ... ensuring init/exit sections work to shrink
   9  * the runtime footprint, and giving us at least some parts of what
  10  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  11  */
  12
  13 #include "composite.c"
  14 #include "usbstring.c"
  15 #include "config.c"
  16 #include "epautoconf.c"
  17
  18 #if defined CONFIG_USB_FUNCTIONFS_ETH || defined CONFIG_USB_FUNCTIONFS_RNDIS
  19 #  if defined USB_ETH_RNDIS
  20 #    undef USB_ETH_RNDIS
  21 #  endif
  22 #  ifdef CONFIG_USB_FUNCTIONFS_RNDIS
  23 #    define USB_ETH_RNDIS y
  24 #  endif
  25
  26 #  include "f_ecm.c"
  27 #  include "f_subset.c"
  28 #  ifdef USB_ETH_RNDIS
  29 #    include "f_rndis.c"
  30 #    include "rndis.c"
  31 #  endif
  32 #  include "u_ether.c"
  33
  34 static u8 gfs_hostaddr[ETH_ALEN];
  35 #  ifdef CONFIG_USB_FUNCTIONFS_ETH
  36 static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
  37 #  endif
  38 #else
  39 #  define gether_cleanup() do { } while (0)
  40 #  define gether_setup(gadget, hostaddr)   ((int)0)
  41 #  define gfs_hostaddr NULL
  42 #endif
  43
  44 #include "f_fs.c"
  45
  46
  47 #define DRIVER_NAME     "g_ffs"
  48 #define DRIVER_DESC     "USB Function Filesystem"
  49 #define DRIVER_VERSION  "24 Aug 2004"
  50
  51 MODULE_DESCRIPTION(DRIVER_DESC);
  52 MODULE_AUTHOR("Michal Nazarewicz");
  53 MODULE_LICENSE("GPL");
  54
  55
  56 static unsigned short gfs_vendor_id    = 0x0525;        /* XXX NetChip */
  57 static unsigned short gfs_product_id   = 0xa4ac;        /* XXX */
  58
  59 static struct usb_device_descriptor gfs_dev_desc = {
  60         .bLength                = sizeof gfs_dev_desc,
  61         .bDescriptorType        = USB_DT_DEVICE,
  62
  63         .bcdUSB                 = cpu_to_le16(0x0200),
  64         .bDeviceClass           = USB_CLASS_PER_INTERFACE,
  65
  66         /* Vendor and product id can be overridden by module parameters.  */
  67         /* .idVendor            = cpu_to_le16(gfs_vendor_id), */
  68         /* .idProduct           = cpu_to_le16(gfs_product_id), */
  69         /* .bcdDevice           = f(hardware) */
  70         /* .iManufacturer       = DYNAMIC */
  71         /* .iProduct            = DYNAMIC */
  72         /* NO SERIAL NUMBER */
  73         .bNumConfigurations     = 1,
  74 };
  75
  76 #define GFS_MODULE_PARAM_DESC(name, field) \
  77         MODULE_PARM_DESC(name, "Value of the " #field " field of the device descriptor sent to the host.  Takes effect only prior to the user-space driver registering to the FunctionFS.")
  78
  79 module_param_named(usb_class,    gfs_dev_desc.bDeviceClass,    byte,   0644);
  80 GFS_MODULE_PARAM_DESC(usb_class, bDeviceClass);
  81 module_param_named(usb_subclass, gfs_dev_desc.bDeviceSubClass, byte,   0644);
  82 GFS_MODULE_PARAM_DESC(usb_subclass, bDeviceSubClass);
  83 module_param_named(usb_protocol, gfs_dev_desc.bDeviceProtocol, byte,   0644);
  84 GFS_MODULE_PARAM_DESC(usb_protocol, bDeviceProtocol);
  85 module_param_named(usb_vendor,   gfs_vendor_id,                ushort, 0644);
  86 GFS_MODULE_PARAM_DESC(usb_vendor, idVendor);
  87 module_param_named(usb_product,  gfs_product_id,               ushort, 0644);
  88 GFS_MODULE_PARAM_DESC(usb_product, idProduct);
  89
  90
  91
  92 static const struct usb_descriptor_header *gfs_otg_desc[] = {
  93         (const struct usb_descriptor_header *)
  94         &(const struct usb_otg_descriptor) {
  95                 .bLength                = sizeof(struct usb_otg_descriptor),
  96                 .bDescriptorType        = USB_DT_OTG,
  97
  98                 /* REVISIT SRP-only hardware is possible, although
  99                  * it would not be called "OTG" ... */
 100                 .bmAttributes           = USB_OTG_SRP | USB_OTG_HNP,
 101         },
 102
 103         NULL
 104 };
 105
 106 /* string IDs are assigned dynamically */
 107
 108 enum {
 109         GFS_STRING_MANUFACTURER_IDX,
 110         GFS_STRING_PRODUCT_IDX,
 111         GFS_STRING_FIRST_CONFIG_IDX,
 112 };
 113
 114 static       char gfs_manufacturer[50];
 115 static const char gfs_driver_desc[] = DRIVER_DESC;
 116 static const char gfs_short_name[]  = DRIVER_NAME;
 117
 118 static struct usb_string gfs_strings[] = {
 119         [GFS_STRING_MANUFACTURER_IDX].s = gfs_manufacturer,
 120         [GFS_STRING_PRODUCT_IDX].s = gfs_driver_desc,
 121 #ifdef CONFIG_USB_FUNCTIONFS_RNDIS
 122         { .s = "FunctionFS + RNDIS" },
 123 #endif
 124 #ifdef CONFIG_USB_FUNCTIONFS_ETH
 125         { .s = "FunctionFS + ECM" },
 126 #endif
 127 #ifdef CONFIG_USB_FUNCTIONFS_GENERIC
 128         { .s = "FunctionFS" },
 129 #endif
 130         {  } /* end of list */
 131 };
 132
 133 static struct usb_gadget_strings *gfs_dev_strings[] = {
 134         &(struct usb_gadget_strings) {
 135                 .language       = 0x0409,       /* en-us */
 136                 .strings        = gfs_strings,
 137         },
 138         NULL,
 139 };
 140
 141
 142
 143 struct gfs_configuration {
 144         struct usb_configuration c;
 145         int (*eth)(struct usb_configuration *c, u8 *ethaddr);
 146 } gfs_configurations[] = {
 147 #ifdef CONFIG_USB_FUNCTIONFS_RNDIS
 148         {
 149                 .eth            = rndis_bind_config,
 150         },
 151 #endif
 152
 153 #ifdef CONFIG_USB_FUNCTIONFS_ETH
 154         {
 155                 .eth            = eth_bind_config,
 156         },
 157 #endif
 158
 159 #ifdef CONFIG_USB_FUNCTIONFS_GENERIC
 160         {
 161         },
 162 #endif
 163 };
 164
 165
 166 static int gfs_bind(struct usb_composite_dev *cdev);
 167 static int gfs_unbind(struct usb_composite_dev *cdev);
 168 static int gfs_do_config(struct usb_configuration *c);
 169
 170 static struct usb_composite_driver gfs_driver = {
 171         .name           = gfs_short_name,
 172         .dev            = &gfs_dev_desc,
 173         .strings        = gfs_dev_strings,
 174         .bind           = gfs_bind,
 175         .unbind         = gfs_unbind,
 176 };
 177
 178
 179 static struct ffs_data *gfs_ffs_data;
 180 static unsigned long gfs_registered;
 181
 182
 183 static int  gfs_init(void)
 184 {
 185         ENTER();
 186
 187         return functionfs_init();
 188 }
 189 module_init(gfs_init);
 190
 191 static void  gfs_exit(void)
 192 {
 193         ENTER();
 194
 195         if (test_and_clear_bit(0, &gfs_registered))
 196                 usb_composite_unregister(&gfs_driver);
 197
 198         functionfs_cleanup();
 199 }
 200 module_exit(gfs_exit);
 201
 202
 203 static int functionfs_ready_callback(struct ffs_data *ffs)
 204 {
 205         int ret;
 206
 207         ENTER();
 208
 209         if (WARN_ON(test_and_set_bit(0, &gfs_registered)))
 210                 return -EBUSY;
 211
 212         gfs_ffs_data = ffs;
 213         ret = usb_composite_register(&gfs_driver);
 214         if (unlikely(ret < 0))
 215                 clear_bit(0, &gfs_registered);
 216         return ret;
 217 }
 218
 219 static void functionfs_closed_callback(struct ffs_data *ffs)
 220 {
 221         ENTER();
 222
 223         if (test_and_clear_bit(0, &gfs_registered))
 224                 usb_composite_unregister(&gfs_driver);
 225 }
 226
 227
 228 static int functionfs_check_dev_callback(const char *dev_name)
 229 {
 230         return 0;
 231 }
 232
 233
 234
 235 static int gfs_bind(struct usb_composite_dev *cdev)
 236 {
 237         int ret, i;
 238
 239         ENTER();
 240
 241         if (WARN_ON(!gfs_ffs_data))
 242                 return -ENODEV;
 243
 244         ret = gether_setup(cdev->gadget, gfs_hostaddr);
 245         if (unlikely(ret < 0))
 246                 goto error_quick;
 247
 248         gfs_dev_desc.idVendor  = cpu_to_le16(gfs_vendor_id);
 249         gfs_dev_desc.idProduct = cpu_to_le16(gfs_product_id);
 250
 251         snprintf(gfs_manufacturer, sizeof gfs_manufacturer, "%s %s with %s",
 252                  init_utsname()->sysname, init_utsname()->release,
 253                  cdev->gadget->name);
 254
 255         ret = usb_string_ids_tab(cdev, gfs_strings);
 256         if (unlikely(ret < 0))
 257                 goto error;
 258
 259         gfs_dev_desc.iManufacturer = gfs_strings[GFS_STRING_MANUFACTURER_IDX].id;
 260         gfs_dev_desc.iProduct      = gfs_strings[GFS_STRING_PRODUCT_IDX].id;
 261
 262         ret = functionfs_bind(gfs_ffs_data, cdev);
 263         if (unlikely(ret < 0))
 264                 goto error;
 265
 266         for (i = 0; i < ARRAY_SIZE(gfs_configurations); ++i) {
 267                 struct gfs_configuration *c = gfs_configurations + i;
 268
 269                 ret = GFS_STRING_FIRST_CONFIG_IDX + i;
 270                 c->c.label                      = gfs_strings[ret].s;
 271                 c->c.iConfiguration             = gfs_strings[ret].id;
 272                 c->c.bind                       = gfs_do_config;
 273                 c->c.bConfigurationValue        = 1 + i;
 274                 c->c.bmAttributes               = USB_CONFIG_ATT_SELFPOWER;
 275
 276                 ret = usb_add_config(cdev, &c->c);
 277                 if (unlikely(ret < 0))
 278                         goto error_unbind;
 279         }
 280
 281         return 0;
 282
 283 error_unbind:
 284         functionfs_unbind(gfs_ffs_data);
 285 error:
 286         gether_cleanup();
 287 error_quick:
 288         gfs_ffs_data = NULL;
 289         return ret;
 290 }
 291
 292 static int gfs_unbind(struct usb_composite_dev *cdev)
 293 {
 294         ENTER();
 295
 296         /* We may have been called in an error recovery frem
 297          * composite_bind() after gfs_unbind() failure so we need to
 298          * check if gfs_ffs_data is not NULL since gfs_bind() handles
 299          * all error recovery itself.  I'd rather we werent called
 300          * from composite on orror recovery, but what you're gonna
 301          * do...? */
 302
 303         if (gfs_ffs_data) {
 304                 gether_cleanup();
 305                 functionfs_unbind(gfs_ffs_data);
 306                 gfs_ffs_data = NULL;
 307         }
 308
 309         return 0;
 310 }
 311
 312
 313 static int gfs_do_config(struct usb_configuration *c)
 314 {
 315         struct gfs_configuration *gc =
 316                 container_of(c, struct gfs_configuration, c);
 317         int ret;
 318
 319         if (WARN_ON(!gfs_ffs_data))
 320                 return -ENODEV;
 321
 322         if (gadget_is_otg(c->cdev->gadget)) {
 323                 c->descriptors = gfs_otg_desc;
 324                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 325         }
 326
 327         if (gc->eth) {
 328                 ret = gc->eth(c, gfs_hostaddr);
 329                 if (unlikely(ret < 0))
 330                         return ret;
 331         }
 332
 333         ret = functionfs_bind_config(c->cdev, c, gfs_ffs_data);
 334         if (unlikely(ret < 0))
 335                 return ret;
 336
 337         /* After previous do_configs there may be some invalid
 338          * pointers in c->interface array.  This happens every time
 339          * a user space function with fewer interfaces than a user
 340          * space function that was run before the new one is run.  The
 341          * compasit's set_config() assumes that if there is no more
 342          * then MAX_CONFIG_INTERFACES interfaces in a configuration
 343          * then there is a NULL pointer after the last interface in
 344          * c->interface array.  We need to make sure this is true. */
 345         if (c->next_interface_id < ARRAY_SIZE(c->interface))
 346                 c->interface[c->next_interface_id] = NULL;
 347
 348         return 0;
 349 }
 350
 351
 352 #ifdef CONFIG_USB_FUNCTIONFS_ETH
 353 static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
 354 {
 355         return can_support_ecm(c->cdev->gadget)
 356                 ? ecm_bind_config(c, ethaddr)
 357                 : geth_bind_config(c, ethaddr);
 358 }
 359 #endif