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 #define GFS_VENDOR_ID   0x1d6b  /* Linux Foundation */
  56 #define GFS_PRODUCT_ID  0x0105  /* FunctionFS Gadget */
  57
  58 static struct usb_device_descriptor gfs_dev_desc = {
  59         .bLength                = sizeof gfs_dev_desc,
  60         .bDescriptorType        = USB_DT_DEVICE,
  61
  62         .bcdUSB                 = cpu_to_le16(0x0200),
  63         .bDeviceClass           = USB_CLASS_PER_INTERFACE,
  64
  65         .idVendor               = cpu_to_le16(GFS_VENDOR_ID),
  66         .idProduct              = cpu_to_le16(GFS_PRODUCT_ID),
  67 };
  68
  69 module_param_named(bDeviceClass,    gfs_dev_desc.bDeviceClass,    byte,   0644);
  70 MODULE_PARM_DESC(bDeviceClass, "USB Device class");
  71 module_param_named(bDeviceSubClass, gfs_dev_desc.bDeviceSubClass, byte,   0644);
  72 MODULE_PARM_DESC(bDeviceSubClass, "USB Device subclass");
  73 module_param_named(bDeviceProtocol, gfs_dev_desc.bDeviceProtocol, byte,   0644);
  74 MODULE_PARM_DESC(bDeviceProtocol, "USB Device protocol");
  75
  76
  77
  78 static const struct usb_descriptor_header *gfs_otg_desc[] = {
  79         (const struct usb_descriptor_header *)
  80         &(const struct usb_otg_descriptor) {
  81                 .bLength                = sizeof(struct usb_otg_descriptor),
  82                 .bDescriptorType        = USB_DT_OTG,
  83
  84                 /*
  85                  * REVISIT SRP-only hardware is possible, although
  86                  * it would not be called "OTG" ...
  87                  */
  88                 .bmAttributes           = USB_OTG_SRP | USB_OTG_HNP,
  89         },
  90
  91         NULL
  92 };
  93
  94 /* string IDs are assigned dynamically */
  95
  96 static struct usb_string gfs_strings[] = {
  97 #ifdef CONFIG_USB_FUNCTIONFS_RNDIS
  98         { .s = "FunctionFS + RNDIS" },
  99 #endif
 100 #ifdef CONFIG_USB_FUNCTIONFS_ETH
 101         { .s = "FunctionFS + ECM" },
 102 #endif
 103 #ifdef CONFIG_USB_FUNCTIONFS_GENERIC
 104         { .s = "FunctionFS" },
 105 #endif
 106         {  } /* end of list */
 107 };
 108
 109 static struct usb_gadget_strings *gfs_dev_strings[] = {
 110         &(struct usb_gadget_strings) {
 111                 .language       = 0x0409,       /* en-us */
 112                 .strings        = gfs_strings,
 113         },
 114         NULL,
 115 };
 116
 117
 118
 119 struct gfs_configuration {
 120         struct usb_configuration c;
 121         int (*eth)(struct usb_configuration *c, u8 *ethaddr);
 122 } gfs_configurations[] = {
 123 #ifdef CONFIG_USB_FUNCTIONFS_RNDIS
 124         {
 125                 .eth            = rndis_bind_config,
 126         },
 127 #endif
 128
 129 #ifdef CONFIG_USB_FUNCTIONFS_ETH
 130         {
 131                 .eth            = eth_bind_config,
 132         },
 133 #endif
 134
 135 #ifdef CONFIG_USB_FUNCTIONFS_GENERIC
 136         {
 137         },
 138 #endif
 139 };
 140
 141
 142 static int gfs_bind(struct usb_composite_dev *cdev);
 143 static int gfs_unbind(struct usb_composite_dev *cdev);
 144 static int gfs_do_config(struct usb_configuration *c);
 145
 146 static struct usb_composite_driver gfs_driver = {
 147         .name           = DRIVER_NAME,
 148         .dev            = &gfs_dev_desc,
 149         .strings        = gfs_dev_strings,
 150         .bind           = gfs_bind,
 151         .unbind         = gfs_unbind,
 152         .iProduct       = DRIVER_DESC,
 153 };
 154
 155
 156 static struct ffs_data *gfs_ffs_data;
 157 static unsigned long gfs_registered;
 158
 159
 160 static int  gfs_init(void)
 161 {
 162         ENTER();
 163
 164         return functionfs_init();
 165 }
 166 module_init(gfs_init);
 167
 168 static void  gfs_exit(void)
 169 {
 170         ENTER();
 171
 172         if (test_and_clear_bit(0, &gfs_registered))
 173                 usb_composite_unregister(&gfs_driver);
 174
 175         functionfs_cleanup();
 176 }
 177 module_exit(gfs_exit);
 178
 179
 180 static int functionfs_ready_callback(struct ffs_data *ffs)
 181 {
 182         int ret;
 183
 184         ENTER();
 185
 186         if (WARN_ON(test_and_set_bit(0, &gfs_registered)))
 187                 return -EBUSY;
 188
 189         gfs_ffs_data = ffs;
 190         ret = usb_composite_register(&gfs_driver);
 191         if (unlikely(ret < 0))
 192                 clear_bit(0, &gfs_registered);
 193         return ret;
 194 }
 195
 196 static void functionfs_closed_callback(struct ffs_data *ffs)
 197 {
 198         ENTER();
 199
 200         if (test_and_clear_bit(0, &gfs_registered))
 201                 usb_composite_unregister(&gfs_driver);
 202 }
 203
 204
 205 static int functionfs_check_dev_callback(const char *dev_name)
 206 {
 207         return 0;
 208 }
 209
 210
 211
 212 static int gfs_bind(struct usb_composite_dev *cdev)
 213 {
 214         int ret, i;
 215
 216         ENTER();
 217
 218         if (WARN_ON(!gfs_ffs_data))
 219                 return -ENODEV;
 220
 221         ret = gether_setup(cdev->gadget, gfs_hostaddr);
 222         if (unlikely(ret < 0))
 223                 goto error_quick;
 224
 225         ret = usb_string_ids_tab(cdev, gfs_strings);
 226         if (unlikely(ret < 0))
 227                 goto error;
 228
 229         ret = functionfs_bind(gfs_ffs_data, cdev);
 230         if (unlikely(ret < 0))
 231                 goto error;
 232
 233         for (i = 0; i < ARRAY_SIZE(gfs_configurations); ++i) {
 234                 struct gfs_configuration *c = gfs_configurations + i;
 235
 236                 c->c.label                      = gfs_strings[i].s;
 237                 c->c.iConfiguration             = gfs_strings[i].id;
 238                 c->c.bind                       = gfs_do_config;
 239                 c->c.bConfigurationValue        = 1 + i;
 240                 c->c.bmAttributes               = USB_CONFIG_ATT_SELFPOWER;
 241
 242                 ret = usb_add_config(cdev, &c->c);
 243                 if (unlikely(ret < 0))
 244                         goto error_unbind;
 245         }
 246
 247         return 0;
 248
 249 error_unbind:
 250         functionfs_unbind(gfs_ffs_data);
 251 error:
 252         gether_cleanup();
 253 error_quick:
 254         gfs_ffs_data = NULL;
 255         return ret;
 256 }
 257
 258 static int gfs_unbind(struct usb_composite_dev *cdev)
 259 {
 260         ENTER();
 261
 262         /*
 263          * We may have been called in an error recovery from
 264          * composite_bind() after gfs_unbind() failure so we need to
 265          * check if gfs_ffs_data is not NULL since gfs_bind() handles
 266          * all error recovery itself.  I'd rather we werent called
 267          * from composite on orror recovery, but what you're gonna
 268          * do...?
 269          */
 270         if (gfs_ffs_data) {
 271                 gether_cleanup();
 272                 functionfs_unbind(gfs_ffs_data);
 273                 gfs_ffs_data = NULL;
 274         }
 275
 276         return 0;
 277 }
 278
 279
 280 static int gfs_do_config(struct usb_configuration *c)
 281 {
 282         struct gfs_configuration *gc =
 283                 container_of(c, struct gfs_configuration, c);
 284         int ret;
 285
 286         if (WARN_ON(!gfs_ffs_data))
 287                 return -ENODEV;
 288
 289         if (gadget_is_otg(c->cdev->gadget)) {
 290                 c->descriptors = gfs_otg_desc;
 291                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 292         }
 293
 294         if (gc->eth) {
 295                 ret = gc->eth(c, gfs_hostaddr);
 296                 if (unlikely(ret < 0))
 297                         return ret;
 298         }
 299
 300         ret = functionfs_bind_config(c->cdev, c, gfs_ffs_data);
 301         if (unlikely(ret < 0))
 302                 return ret;
 303
 304         /*
 305          * After previous do_configs there may be some invalid
 306          * pointers in c->interface array.  This happens every time
 307          * a user space function with fewer interfaces than a user
 308          * space function that was run before the new one is run.  The
 309          * compasit's set_config() assumes that if there is no more
 310          * then MAX_CONFIG_INTERFACES interfaces in a configuration
 311          * then there is a NULL pointer after the last interface in
 312          * c->interface array.  We need to make sure this is true.
 313          */
 314         if (c->next_interface_id < ARRAY_SIZE(c->interface))
 315                 c->interface[c->next_interface_id] = NULL;
 316
 317         return 0;
 318 }
 319
 320
 321 #ifdef CONFIG_USB_FUNCTIONFS_ETH
 322
 323 static int eth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
 324 {
 325         return can_support_ecm(c->cdev->gadget)
 326                 ? ecm_bind_config(c, ethaddr)
 327                 : geth_bind_config(c, ethaddr);
 328 }
 329
 330 #endif