git.oblomov.eu Git - linux-2.6/blob - drivers/usb/gadget/serial.c

   1 /*
   2  * g_serial.c -- USB gadget serial driver
   3  *
   4  * Copyright 2003 (C) Al Borchers (alborchers@steinerpoint.com)
   5  *
   6  * This code is based in part on the Gadget Zero driver, which
   7  * is Copyright (C) 2003 by David Brownell, all rights reserved.
   8  *
   9  * This code also borrows from usbserial.c, which is
  10  * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
  11  * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
  12  * Copyright (C) 2000 Al Borchers (alborchers@steinerpoint.com)
  13  *
  14  * This software is distributed under the terms of the GNU General
  15  * Public License ("GPL") as published by the Free Software Foundation,
  16  * either version 2 of that License or (at your option) any later version.
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/utsname.h>
  22 #include <linux/device.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25
  26 #include <linux/usb/ch9.h>
  27 #include <linux/usb/cdc.h>
  28 #include <linux/usb/gadget.h>
  29
  30 #include "gadget_chips.h"
  31
  32
  33 /* Defines */
  34
  35 #define GS_VERSION_STR                  "v2.2"
  36 #define GS_VERSION_NUM                  0x0202
  37
  38 #define GS_LONG_NAME                    "Gadget Serial"
  39 #define GS_SHORT_NAME                   "g_serial"
  40
  41 #define GS_MAJOR                        127
  42 #define GS_MINOR_START                  0
  43
  44 #define GS_NUM_PORTS                    16
  45
  46 #define GS_NUM_CONFIGS                  1
  47 #define GS_NO_CONFIG_ID                 0
  48 #define GS_BULK_CONFIG_ID               1
  49 #define GS_ACM_CONFIG_ID                2
  50
  51 #define GS_MAX_NUM_INTERFACES           2
  52 #define GS_BULK_INTERFACE_ID            0
  53 #define GS_CONTROL_INTERFACE_ID         0
  54 #define GS_DATA_INTERFACE_ID            1
  55
  56 #define GS_MAX_DESC_LEN                 256
  57
  58 #define GS_DEFAULT_READ_Q_SIZE          32
  59 #define GS_DEFAULT_WRITE_Q_SIZE         32
  60
  61 #define GS_DEFAULT_WRITE_BUF_SIZE       8192
  62 #define GS_TMP_BUF_SIZE                 8192
  63
  64 #define GS_CLOSE_TIMEOUT                15
  65
  66 #define GS_DEFAULT_USE_ACM              0
  67
  68 #define GS_DEFAULT_DTE_RATE             9600
  69 #define GS_DEFAULT_DATA_BITS            8
  70 #define GS_DEFAULT_PARITY               USB_CDC_NO_PARITY
  71 #define GS_DEFAULT_CHAR_FORMAT          USB_CDC_1_STOP_BITS
  72
  73 /* maxpacket and other transfer characteristics vary by speed. */
  74 static inline struct usb_endpoint_descriptor *
  75 choose_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs,
  76                 struct usb_endpoint_descriptor *fs)
  77 {
  78         if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
  79                 return hs;
  80         return fs;
  81 }
  82
  83
  84 /* debug settings */
  85 #ifdef DEBUG
  86 static int debug = 1;
  87 #else
  88 #define debug 0
  89 #endif
  90
  91 #define gs_debug(format, arg...) \
  92         do { if (debug) printk(KERN_DEBUG format, ## arg); } while(0)
  93 #define gs_debug_level(level, format, arg...) \
  94         do { if (debug>=level) printk(KERN_DEBUG format, ## arg); } while(0)
  95
  96
  97 /* Thanks to NetChip Technologies for donating this product ID.
  98  *
  99  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 100  * Instead:  allocate your own, using normal USB-IF procedures.
 101  */
 102 #define GS_VENDOR_ID                    0x0525  /* NetChip */
 103 #define GS_PRODUCT_ID                   0xa4a6  /* Linux-USB Serial Gadget */
 104 #define GS_CDC_PRODUCT_ID               0xa4a7  /* ... as CDC-ACM */
 105
 106 #define GS_LOG2_NOTIFY_INTERVAL         5       /* 1 << 5 == 32 msec */
 107 #define GS_NOTIFY_MAXPACKET             8
 108
 109
 110 /* Structures */
 111
 112 struct gs_dev;
 113
 114 /* circular buffer */
 115 struct gs_buf {
 116         unsigned int            buf_size;
 117         char                    *buf_buf;
 118         char                    *buf_get;
 119         char                    *buf_put;
 120 };
 121
 122 /* list of requests */
 123 struct gs_req_entry {
 124         struct list_head        re_entry;
 125         struct usb_request      *re_req;
 126 };
 127
 128 /* the port structure holds info for each port, one for each minor number */
 129 struct gs_port {
 130         struct gs_dev           *port_dev;      /* pointer to device struct */
 131         struct tty_struct       *port_tty;      /* pointer to tty struct */
 132         spinlock_t              port_lock;
 133         int                     port_num;
 134         int                     port_open_count;
 135         int                     port_in_use;    /* open/close in progress */
 136         wait_queue_head_t       port_write_wait;/* waiting to write */
 137         struct gs_buf           *port_write_buf;
 138         struct usb_cdc_line_coding      port_line_coding;
 139 };
 140
 141 /* the device structure holds info for the USB device */
 142 struct gs_dev {
 143         struct usb_gadget       *dev_gadget;    /* gadget device pointer */
 144         spinlock_t              dev_lock;       /* lock for set/reset config */
 145         int                     dev_config;     /* configuration number */
 146         struct usb_ep           *dev_notify_ep; /* address of notify endpoint */
 147         struct usb_ep           *dev_in_ep;     /* address of in endpoint */
 148         struct usb_ep           *dev_out_ep;    /* address of out endpoint */
 149         struct usb_endpoint_descriptor          /* descriptor of notify ep */
 150                                 *dev_notify_ep_desc;
 151         struct usb_endpoint_descriptor          /* descriptor of in endpoint */
 152                                 *dev_in_ep_desc;
 153         struct usb_endpoint_descriptor          /* descriptor of out endpoint */
 154                                 *dev_out_ep_desc;
 155         struct usb_request      *dev_ctrl_req;  /* control request */
 156         struct list_head        dev_req_list;   /* list of write requests */
 157         int                     dev_sched_port; /* round robin port scheduled */
 158         struct gs_port          *dev_port[GS_NUM_PORTS]; /* the ports */
 159 };
 160
 161
 162 /* Functions */
 163
 164 /* module */
 165 static int __init gs_module_init(void);
 166 static void __exit gs_module_exit(void);
 167
 168 /* tty driver */
 169 static int gs_open(struct tty_struct *tty, struct file *file);
 170 static void gs_close(struct tty_struct *tty, struct file *file);
 171 static int gs_write(struct tty_struct *tty,
 172         const unsigned char *buf, int count);
 173 static void gs_put_char(struct tty_struct *tty, unsigned char ch);
 174 static void gs_flush_chars(struct tty_struct *tty);
 175 static int gs_write_room(struct tty_struct *tty);
 176 static int gs_chars_in_buffer(struct tty_struct *tty);
 177 static void gs_throttle(struct tty_struct * tty);
 178 static void gs_unthrottle(struct tty_struct * tty);
 179 static void gs_break(struct tty_struct *tty, int break_state);
 180 static int  gs_ioctl(struct tty_struct *tty, struct file *file,
 181         unsigned int cmd, unsigned long arg);
 182 static void gs_set_termios(struct tty_struct *tty, struct ktermios *old);
 183
 184 static int gs_send(struct gs_dev *dev);
 185 static int gs_send_packet(struct gs_dev *dev, char *packet,
 186         unsigned int size);
 187 static int gs_recv_packet(struct gs_dev *dev, char *packet,
 188         unsigned int size);
 189 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
 190 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
 191
 192 /* gadget driver */
 193 static int gs_bind(struct usb_gadget *gadget);
 194 static void gs_unbind(struct usb_gadget *gadget);
 195 static int gs_setup(struct usb_gadget *gadget,
 196         const struct usb_ctrlrequest *ctrl);
 197 static int gs_setup_standard(struct usb_gadget *gadget,
 198         const struct usb_ctrlrequest *ctrl);
 199 static int gs_setup_class(struct usb_gadget *gadget,
 200         const struct usb_ctrlrequest *ctrl);
 201 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
 202 static void gs_disconnect(struct usb_gadget *gadget);
 203 static int gs_set_config(struct gs_dev *dev, unsigned config);
 204 static void gs_reset_config(struct gs_dev *dev);
 205 static int gs_build_config_buf(u8 *buf, struct usb_gadget *g,
 206                 u8 type, unsigned int index, int is_otg);
 207
 208 static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
 209         gfp_t kmalloc_flags);
 210 static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
 211
 212 static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
 213         gfp_t kmalloc_flags);
 214 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
 215
 216 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags);
 217 static void gs_free_ports(struct gs_dev *dev);
 218
 219 /* circular buffer */
 220 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags);
 221 static void gs_buf_free(struct gs_buf *gb);
 222 static void gs_buf_clear(struct gs_buf *gb);
 223 static unsigned int gs_buf_data_avail(struct gs_buf *gb);
 224 static unsigned int gs_buf_space_avail(struct gs_buf *gb);
 225 static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
 226         unsigned int count);
 227 static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
 228         unsigned int count);
 229
 230 /* external functions */
 231 extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
 232
 233
 234 /* Globals */
 235
 236 static struct gs_dev *gs_device;
 237
 238 static const char *EP_IN_NAME;
 239 static const char *EP_OUT_NAME;
 240 static const char *EP_NOTIFY_NAME;
 241
 242 static struct mutex gs_open_close_lock[GS_NUM_PORTS];
 243
 244 static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
 245 static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
 246
 247 static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
 248
 249 static unsigned int use_acm = GS_DEFAULT_USE_ACM;
 250
 251
 252 /* tty driver struct */
 253 static const struct tty_operations gs_tty_ops = {
 254         .open =                 gs_open,
 255         .close =                gs_close,
 256         .write =                gs_write,
 257         .put_char =             gs_put_char,
 258         .flush_chars =          gs_flush_chars,
 259         .write_room =           gs_write_room,
 260         .ioctl =                gs_ioctl,
 261         .set_termios =          gs_set_termios,
 262         .throttle =             gs_throttle,
 263         .unthrottle =           gs_unthrottle,
 264         .break_ctl =            gs_break,
 265         .chars_in_buffer =      gs_chars_in_buffer,
 266 };
 267 static struct tty_driver *gs_tty_driver;
 268
 269 /* gadget driver struct */
 270 static struct usb_gadget_driver gs_gadget_driver = {
 271 #ifdef CONFIG_USB_GADGET_DUALSPEED
 272         .speed =                USB_SPEED_HIGH,
 273 #else
 274         .speed =                USB_SPEED_FULL,
 275 #endif /* CONFIG_USB_GADGET_DUALSPEED */
 276         .function =             GS_LONG_NAME,
 277         .bind =                 gs_bind,
 278         .unbind =               gs_unbind,
 279         .setup =                gs_setup,
 280         .disconnect =           gs_disconnect,
 281         .driver = {
 282                 .name =         GS_SHORT_NAME,
 283         },
 284 };
 285
 286
 287 /* USB descriptors */
 288
 289 #define GS_MANUFACTURER_STR_ID  1
 290 #define GS_PRODUCT_STR_ID       2
 291 #define GS_SERIAL_STR_ID        3
 292 #define GS_BULK_CONFIG_STR_ID   4
 293 #define GS_ACM_CONFIG_STR_ID    5
 294 #define GS_CONTROL_STR_ID       6
 295 #define GS_DATA_STR_ID          7
 296
 297 /* static strings, in UTF-8 */
 298 static char manufacturer[50];
 299 static struct usb_string gs_strings[] = {
 300         { GS_MANUFACTURER_STR_ID, manufacturer },
 301         { GS_PRODUCT_STR_ID, GS_LONG_NAME },
 302         { GS_SERIAL_STR_ID, "0" },
 303         { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
 304         { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
 305         { GS_CONTROL_STR_ID, "Gadget Serial Control" },
 306         { GS_DATA_STR_ID, "Gadget Serial Data" },
 307         {  } /* end of list */
 308 };
 309
 310 static struct usb_gadget_strings gs_string_table = {
 311         .language =             0x0409, /* en-us */
 312         .strings =              gs_strings,
 313 };
 314
 315 static struct usb_device_descriptor gs_device_desc = {
 316         .bLength =              USB_DT_DEVICE_SIZE,
 317         .bDescriptorType =      USB_DT_DEVICE,
 318         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 319         .bDeviceSubClass =      0,
 320         .bDeviceProtocol =      0,
 321         .idVendor =             __constant_cpu_to_le16(GS_VENDOR_ID),
 322         .idProduct =            __constant_cpu_to_le16(GS_PRODUCT_ID),
 323         .iManufacturer =        GS_MANUFACTURER_STR_ID,
 324         .iProduct =             GS_PRODUCT_STR_ID,
 325         .iSerialNumber =        GS_SERIAL_STR_ID,
 326         .bNumConfigurations =   GS_NUM_CONFIGS,
 327 };
 328
 329 static struct usb_otg_descriptor gs_otg_descriptor = {
 330         .bLength =              sizeof(gs_otg_descriptor),
 331         .bDescriptorType =      USB_DT_OTG,
 332         .bmAttributes =         USB_OTG_SRP,
 333 };
 334
 335 static struct usb_config_descriptor gs_bulk_config_desc = {
 336         .bLength =              USB_DT_CONFIG_SIZE,
 337         .bDescriptorType =      USB_DT_CONFIG,
 338         /* .wTotalLength computed dynamically */
 339         .bNumInterfaces =       1,
 340         .bConfigurationValue =  GS_BULK_CONFIG_ID,
 341         .iConfiguration =       GS_BULK_CONFIG_STR_ID,
 342         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 343         .bMaxPower =            1,
 344 };
 345
 346 static struct usb_config_descriptor gs_acm_config_desc = {
 347         .bLength =              USB_DT_CONFIG_SIZE,
 348         .bDescriptorType =      USB_DT_CONFIG,
 349         /* .wTotalLength computed dynamically */
 350         .bNumInterfaces =       2,
 351         .bConfigurationValue =  GS_ACM_CONFIG_ID,
 352         .iConfiguration =       GS_ACM_CONFIG_STR_ID,
 353         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 354         .bMaxPower =            1,
 355 };
 356
 357 static const struct usb_interface_descriptor gs_bulk_interface_desc = {
 358         .bLength =              USB_DT_INTERFACE_SIZE,
 359         .bDescriptorType =      USB_DT_INTERFACE,
 360         .bInterfaceNumber =     GS_BULK_INTERFACE_ID,
 361         .bNumEndpoints =        2,
 362         .bInterfaceClass =      USB_CLASS_CDC_DATA,
 363         .bInterfaceSubClass =   0,
 364         .bInterfaceProtocol =   0,
 365         .iInterface =           GS_DATA_STR_ID,
 366 };
 367
 368 static const struct usb_interface_descriptor gs_control_interface_desc = {
 369         .bLength =              USB_DT_INTERFACE_SIZE,
 370         .bDescriptorType =      USB_DT_INTERFACE,
 371         .bInterfaceNumber =     GS_CONTROL_INTERFACE_ID,
 372         .bNumEndpoints =        1,
 373         .bInterfaceClass =      USB_CLASS_COMM,
 374         .bInterfaceSubClass =   USB_CDC_SUBCLASS_ACM,
 375         .bInterfaceProtocol =   USB_CDC_ACM_PROTO_AT_V25TER,
 376         .iInterface =           GS_CONTROL_STR_ID,
 377 };
 378
 379 static const struct usb_interface_descriptor gs_data_interface_desc = {
 380         .bLength =              USB_DT_INTERFACE_SIZE,
 381         .bDescriptorType =      USB_DT_INTERFACE,
 382         .bInterfaceNumber =     GS_DATA_INTERFACE_ID,
 383         .bNumEndpoints =        2,
 384         .bInterfaceClass =      USB_CLASS_CDC_DATA,
 385         .bInterfaceSubClass =   0,
 386         .bInterfaceProtocol =   0,
 387         .iInterface =           GS_DATA_STR_ID,
 388 };
 389
 390 static const struct usb_cdc_header_desc gs_header_desc = {
 391         .bLength =              sizeof(gs_header_desc),
 392         .bDescriptorType =      USB_DT_CS_INTERFACE,
 393         .bDescriptorSubType =   USB_CDC_HEADER_TYPE,
 394         .bcdCDC =               __constant_cpu_to_le16(0x0110),
 395 };
 396
 397 static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
 398         .bLength =              sizeof(gs_call_mgmt_descriptor),
 399         .bDescriptorType =      USB_DT_CS_INTERFACE,
 400         .bDescriptorSubType =   USB_CDC_CALL_MANAGEMENT_TYPE,
 401         .bmCapabilities =       0,
 402         .bDataInterface =       1,      /* index of data interface */
 403 };
 404
 405 static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
 406         .bLength =              sizeof(gs_acm_descriptor),
 407         .bDescriptorType =      USB_DT_CS_INTERFACE,
 408         .bDescriptorSubType =   USB_CDC_ACM_TYPE,
 409         .bmCapabilities =       0,
 410 };
 411
 412 static const struct usb_cdc_union_desc gs_union_desc = {
 413         .bLength =              sizeof(gs_union_desc),
 414         .bDescriptorType =      USB_DT_CS_INTERFACE,
 415         .bDescriptorSubType =   USB_CDC_UNION_TYPE,
 416         .bMasterInterface0 =    0,      /* index of control interface */
 417         .bSlaveInterface0 =     1,      /* index of data interface */
 418 };
 419
 420 static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = {
 421         .bLength =              USB_DT_ENDPOINT_SIZE,
 422         .bDescriptorType =      USB_DT_ENDPOINT,
 423         .bEndpointAddress =     USB_DIR_IN,
 424         .bmAttributes =         USB_ENDPOINT_XFER_INT,
 425         .wMaxPacketSize =       __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
 426         .bInterval =            1 << GS_LOG2_NOTIFY_INTERVAL,
 427 };
 428
 429 static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
 430         .bLength =              USB_DT_ENDPOINT_SIZE,
 431         .bDescriptorType =      USB_DT_ENDPOINT,
 432         .bEndpointAddress =     USB_DIR_IN,
 433         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 434 };
 435
 436 static struct usb_endpoint_descriptor gs_fullspeed_out_desc = {
 437         .bLength =              USB_DT_ENDPOINT_SIZE,
 438         .bDescriptorType =      USB_DT_ENDPOINT,
 439         .bEndpointAddress =     USB_DIR_OUT,
 440         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 441 };
 442
 443 static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = {
 444         (struct usb_descriptor_header *) &gs_otg_descriptor,
 445         (struct usb_descriptor_header *) &gs_bulk_interface_desc,
 446         (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
 447         (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
 448         NULL,
 449 };
 450
 451 static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = {
 452         (struct usb_descriptor_header *) &gs_otg_descriptor,
 453         (struct usb_descriptor_header *) &gs_control_interface_desc,
 454         (struct usb_descriptor_header *) &gs_header_desc,
 455         (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
 456         (struct usb_descriptor_header *) &gs_acm_descriptor,
 457         (struct usb_descriptor_header *) &gs_union_desc,
 458         (struct usb_descriptor_header *) &gs_fullspeed_notify_desc,
 459         (struct usb_descriptor_header *) &gs_data_interface_desc,
 460         (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
 461         (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
 462         NULL,
 463 };
 464
 465 static struct usb_endpoint_descriptor gs_highspeed_notify_desc = {
 466         .bLength =              USB_DT_ENDPOINT_SIZE,
 467         .bDescriptorType =      USB_DT_ENDPOINT,
 468         .bEndpointAddress =     USB_DIR_IN,
 469         .bmAttributes =         USB_ENDPOINT_XFER_INT,
 470         .wMaxPacketSize =       __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
 471         .bInterval =            GS_LOG2_NOTIFY_INTERVAL+4,
 472 };
 473
 474 static struct usb_endpoint_descriptor gs_highspeed_in_desc = {
 475         .bLength =              USB_DT_ENDPOINT_SIZE,
 476         .bDescriptorType =      USB_DT_ENDPOINT,
 477         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 478         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 479 };
 480
 481 static struct usb_endpoint_descriptor gs_highspeed_out_desc = {
 482         .bLength =              USB_DT_ENDPOINT_SIZE,
 483         .bDescriptorType =      USB_DT_ENDPOINT,
 484         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 485         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 486 };
 487
 488 static struct usb_qualifier_descriptor gs_qualifier_desc = {
 489         .bLength =              sizeof(struct usb_qualifier_descriptor),
 490         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
 491         .bcdUSB =               __constant_cpu_to_le16 (0x0200),
 492         /* assumes ep0 uses the same value for both speeds ... */
 493         .bNumConfigurations =   GS_NUM_CONFIGS,
 494 };
 495
 496 static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = {
 497         (struct usb_descriptor_header *) &gs_otg_descriptor,
 498         (struct usb_descriptor_header *) &gs_bulk_interface_desc,
 499         (struct usb_descriptor_header *) &gs_highspeed_in_desc,
 500         (struct usb_descriptor_header *) &gs_highspeed_out_desc,
 501         NULL,
 502 };
 503
 504 static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
 505         (struct usb_descriptor_header *) &gs_otg_descriptor,
 506         (struct usb_descriptor_header *) &gs_control_interface_desc,
 507         (struct usb_descriptor_header *) &gs_header_desc,
 508         (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
 509         (struct usb_descriptor_header *) &gs_acm_descriptor,
 510         (struct usb_descriptor_header *) &gs_union_desc,
 511         (struct usb_descriptor_header *) &gs_highspeed_notify_desc,
 512         (struct usb_descriptor_header *) &gs_data_interface_desc,
 513         (struct usb_descriptor_header *) &gs_highspeed_in_desc,
 514         (struct usb_descriptor_header *) &gs_highspeed_out_desc,
 515         NULL,
 516 };
 517
 518
 519 /* Module */
 520 MODULE_DESCRIPTION(GS_LONG_NAME);
 521 MODULE_AUTHOR("Al Borchers");
 522 MODULE_LICENSE("GPL");
 523
 524 #ifdef DEBUG
 525 module_param(debug, int, S_IRUGO|S_IWUSR);
 526 MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
 527 #endif
 528
 529 module_param(read_q_size, uint, S_IRUGO);
 530 MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
 531
 532 module_param(write_q_size, uint, S_IRUGO);
 533 MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
 534
 535 module_param(write_buf_size, uint, S_IRUGO);
 536 MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
 537
 538 module_param(use_acm, uint, S_IRUGO);
 539 MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
 540
 541 module_init(gs_module_init);
 542 module_exit(gs_module_exit);
 543
 544 /*
 545 *  gs_module_init
 546 *
 547 *  Register as a USB gadget driver and a tty driver.
 548 */
 549 static int __init gs_module_init(void)
 550 {
 551         int i;
 552         int retval;
 553
 554         retval = usb_gadget_register_driver(&gs_gadget_driver);
 555         if (retval) {
 556                 printk(KERN_ERR "gs_module_init: cannot register gadget driver, ret=%d\n", retval);
 557                 return retval;
 558         }
 559
 560         gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
 561         if (!gs_tty_driver)
 562                 return -ENOMEM;
 563         gs_tty_driver->owner = THIS_MODULE;
 564         gs_tty_driver->driver_name = GS_SHORT_NAME;
 565         gs_tty_driver->name = "ttygs";
 566         gs_tty_driver->major = GS_MAJOR;
 567         gs_tty_driver->minor_start = GS_MINOR_START;
 568         gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
 569         gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
 570         gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 571         gs_tty_driver->init_termios = tty_std_termios;
 572         gs_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 573         tty_set_operations(gs_tty_driver, &gs_tty_ops);
 574
 575         for (i=0; i < GS_NUM_PORTS; i++)
 576                 mutex_init(&gs_open_close_lock[i]);
 577
 578         retval = tty_register_driver(gs_tty_driver);
 579         if (retval) {
 580                 usb_gadget_unregister_driver(&gs_gadget_driver);
 581                 put_tty_driver(gs_tty_driver);
 582                 printk(KERN_ERR "gs_module_init: cannot register tty driver, ret=%d\n", retval);
 583                 return retval;
 584         }
 585
 586         printk(KERN_INFO "gs_module_init: %s %s loaded\n", GS_LONG_NAME, GS_VERSION_STR);
 587         return 0;
 588 }
 589
 590 /*
 591 * gs_module_exit
 592 *
 593 * Unregister as a tty driver and a USB gadget driver.
 594 */
 595 static void __exit gs_module_exit(void)
 596 {
 597         tty_unregister_driver(gs_tty_driver);
 598         put_tty_driver(gs_tty_driver);
 599         usb_gadget_unregister_driver(&gs_gadget_driver);
 600
 601         printk(KERN_INFO "gs_module_exit: %s %s unloaded\n", GS_LONG_NAME, GS_VERSION_STR);
 602 }
 603
 604 /* TTY Driver */
 605
 606 /*
 607  * gs_open
 608  */
 609 static int gs_open(struct tty_struct *tty, struct file *file)
 610 {
 611         int port_num;
 612         unsigned long flags;
 613         struct gs_port *port;
 614         struct gs_dev *dev;
 615         struct gs_buf *buf;
 616         struct mutex *mtx;
 617         int ret;
 618
 619         port_num = tty->index;
 620
 621         gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
 622
 623         if (port_num < 0 || port_num >= GS_NUM_PORTS) {
 624                 printk(KERN_ERR "gs_open: (%d,%p,%p) invalid port number\n",
 625                         port_num, tty, file);
 626                 return -ENODEV;
 627         }
 628
 629         dev = gs_device;
 630
 631         if (dev == NULL) {
 632                 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL device pointer\n",
 633                         port_num, tty, file);
 634                 return -ENODEV;
 635         }
 636
 637         mtx = &gs_open_close_lock[port_num];
 638         if (mutex_lock_interruptible(mtx)) {
 639                 printk(KERN_ERR
 640                 "gs_open: (%d,%p,%p) interrupted waiting for mutex\n",
 641                         port_num, tty, file);
 642                 return -ERESTARTSYS;
 643         }
 644
 645         spin_lock_irqsave(&dev->dev_lock, flags);
 646
 647         if (dev->dev_config == GS_NO_CONFIG_ID) {
 648                 printk(KERN_ERR
 649                         "gs_open: (%d,%p,%p) device is not connected\n",
 650                         port_num, tty, file);
 651                 ret = -ENODEV;
 652                 goto exit_unlock_dev;
 653         }
 654
 655         port = dev->dev_port[port_num];
 656
 657         if (port == NULL) {
 658                 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL port pointer\n",
 659                         port_num, tty, file);
 660                 ret = -ENODEV;
 661                 goto exit_unlock_dev;
 662         }
 663
 664         spin_lock(&port->port_lock);
 665         spin_unlock(&dev->dev_lock);
 666
 667         if (port->port_dev == NULL) {
 668                 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (1)\n",
 669                         port_num, tty, file);
 670                 ret = -EIO;
 671                 goto exit_unlock_port;
 672         }
 673
 674         if (port->port_open_count > 0) {
 675                 ++port->port_open_count;
 676                 gs_debug("gs_open: (%d,%p,%p) already open\n",
 677                         port_num, tty, file);
 678                 ret = 0;
 679                 goto exit_unlock_port;
 680         }
 681
 682         tty->driver_data = NULL;
 683
 684         /* mark port as in use, we can drop port lock and sleep if necessary */
 685         port->port_in_use = 1;
 686
 687         /* allocate write buffer on first open */
 688         if (port->port_write_buf == NULL) {
 689                 spin_unlock_irqrestore(&port->port_lock, flags);
 690                 buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
 691                 spin_lock_irqsave(&port->port_lock, flags);
 692
 693                 /* might have been disconnected while asleep, check */
 694                 if (port->port_dev == NULL) {
 695                         printk(KERN_ERR
 696                                 "gs_open: (%d,%p,%p) port disconnected (2)\n",
 697                                 port_num, tty, file);
 698                         port->port_in_use = 0;
 699                         ret = -EIO;
 700                         goto exit_unlock_port;
 701                 }
 702
 703                 if ((port->port_write_buf=buf) == NULL) {
 704                         printk(KERN_ERR "gs_open: (%d,%p,%p) cannot allocate port write buffer\n",
 705                                 port_num, tty, file);
 706                         port->port_in_use = 0;
 707                         ret = -ENOMEM;
 708                         goto exit_unlock_port;
 709                 }
 710
 711         }
 712
 713         /* wait for carrier detect (not implemented) */
 714
 715         /* might have been disconnected while asleep, check */
 716         if (port->port_dev == NULL) {
 717                 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (3)\n",
 718                         port_num, tty, file);
 719                 port->port_in_use = 0;
 720                 ret = -EIO;
 721                 goto exit_unlock_port;
 722         }
 723
 724         tty->driver_data = port;
 725         port->port_tty = tty;
 726         port->port_open_count = 1;
 727         port->port_in_use = 0;
 728
 729         gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
 730
 731         ret = 0;
 732
 733 exit_unlock_port:
 734         spin_unlock_irqrestore(&port->port_lock, flags);
 735         mutex_unlock(mtx);
 736         return ret;
 737
 738 exit_unlock_dev:
 739         spin_unlock_irqrestore(&dev->dev_lock, flags);
 740         mutex_unlock(mtx);
 741         return ret;
 742
 743 }
 744
 745 /*
 746  * gs_close
 747  */
 748
 749 #define GS_WRITE_FINISHED_EVENT_SAFELY(p)                       \
 750 ({                                                              \
 751         int cond;                                               \
 752                                                                 \
 753         spin_lock_irq(&(p)->port_lock);                         \
 754         cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf); \
 755         spin_unlock_irq(&(p)->port_lock);                       \
 756         cond;                                                   \
 757 })
 758
 759 static void gs_close(struct tty_struct *tty, struct file *file)
 760 {
 761         struct gs_port *port = tty->driver_data;
 762         struct mutex *mtx;
 763
 764         if (port == NULL) {
 765                 printk(KERN_ERR "gs_close: NULL port pointer\n");
 766                 return;
 767         }
 768
 769         gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
 770
 771         mtx = &gs_open_close_lock[port->port_num];
 772         mutex_lock(mtx);
 773
 774         spin_lock_irq(&port->port_lock);
 775
 776         if (port->port_open_count == 0) {
 777                 printk(KERN_ERR
 778                         "gs_close: (%d,%p,%p) port is already closed\n",
 779                         port->port_num, tty, file);
 780                 goto exit;
 781         }
 782
 783         if (port->port_open_count > 1) {
 784                 --port->port_open_count;
 785                 goto exit;
 786         }
 787
 788         /* free disconnected port on final close */
 789         if (port->port_dev == NULL) {
 790                 kfree(port);
 791                 goto exit;
 792         }
 793
 794         /* mark port as closed but in use, we can drop port lock */
 795         /* and sleep if necessary */
 796         port->port_in_use = 1;
 797         port->port_open_count = 0;
 798
 799         /* wait for write buffer to drain, or */
 800         /* at most GS_CLOSE_TIMEOUT seconds */
 801         if (gs_buf_data_avail(port->port_write_buf) > 0) {
 802                 spin_unlock_irq(&port->port_lock);
 803                 wait_event_interruptible_timeout(port->port_write_wait,
 804                                         GS_WRITE_FINISHED_EVENT_SAFELY(port),
 805                                         GS_CLOSE_TIMEOUT * HZ);
 806                 spin_lock_irq(&port->port_lock);
 807         }
 808
 809         /* free disconnected port on final close */
 810         /* (might have happened during the above sleep) */
 811         if (port->port_dev == NULL) {
 812                 kfree(port);
 813                 goto exit;
 814         }
 815
 816         gs_buf_clear(port->port_write_buf);
 817
 818         tty->driver_data = NULL;
 819         port->port_tty = NULL;
 820         port->port_in_use = 0;
 821
 822         gs_debug("gs_close: (%d,%p,%p) completed\n",
 823                 port->port_num, tty, file);
 824
 825 exit:
 826         spin_unlock_irq(&port->port_lock);
 827         mutex_unlock(mtx);
 828 }
 829
 830 /*
 831  * gs_write
 832  */
 833 static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
 834 {
 835         unsigned long flags;
 836         struct gs_port *port = tty->driver_data;
 837         int ret;
 838
 839         if (port == NULL) {
 840                 printk(KERN_ERR "gs_write: NULL port pointer\n");
 841                 return -EIO;
 842         }
 843
 844         gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
 845                 count);
 846
 847         if (count == 0)
 848                 return 0;
 849
 850         spin_lock_irqsave(&port->port_lock, flags);
 851
 852         if (port->port_dev == NULL) {
 853                 printk(KERN_ERR "gs_write: (%d,%p) port is not connected\n",
 854                         port->port_num, tty);
 855                 ret = -EIO;
 856                 goto exit;
 857         }
 858
 859         if (port->port_open_count == 0) {
 860                 printk(KERN_ERR "gs_write: (%d,%p) port is closed\n",
 861                         port->port_num, tty);
 862                 ret = -EBADF;
 863                 goto exit;
 864         }
 865
 866         count = gs_buf_put(port->port_write_buf, buf, count);
 867
 868         spin_unlock_irqrestore(&port->port_lock, flags);
 869
 870         gs_send(gs_device);
 871
 872         gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
 873                 count);
 874
 875         return count;
 876
 877 exit:
 878         spin_unlock_irqrestore(&port->port_lock, flags);
 879         return ret;
 880 }
 881
 882 /*
 883  * gs_put_char
 884  */
 885 static void gs_put_char(struct tty_struct *tty, unsigned char ch)
 886 {
 887         unsigned long flags;
 888         struct gs_port *port = tty->driver_data;
 889
 890         if (port == NULL) {
 891                 printk(KERN_ERR "gs_put_char: NULL port pointer\n");
 892                 return;
 893         }
 894
 895         gs_debug("gs_put_char: (%d,%p) char=0x%x, called from %p\n",
 896                 port->port_num, tty, ch, __builtin_return_address(0));
 897
 898         spin_lock_irqsave(&port->port_lock, flags);
 899
 900         if (port->port_dev == NULL) {
 901                 printk(KERN_ERR "gs_put_char: (%d,%p) port is not connected\n",
 902                         port->port_num, tty);
 903                 goto exit;
 904         }
 905
 906         if (port->port_open_count == 0) {
 907                 printk(KERN_ERR "gs_put_char: (%d,%p) port is closed\n",
 908                         port->port_num, tty);
 909                 goto exit;
 910         }
 911
 912         gs_buf_put(port->port_write_buf, &ch, 1);
 913
 914 exit:
 915         spin_unlock_irqrestore(&port->port_lock, flags);
 916 }
 917
 918 /*
 919  * gs_flush_chars
 920  */
 921 static void gs_flush_chars(struct tty_struct *tty)
 922 {
 923         unsigned long flags;
 924         struct gs_port *port = tty->driver_data;
 925
 926         if (port == NULL) {
 927                 printk(KERN_ERR "gs_flush_chars: NULL port pointer\n");
 928                 return;
 929         }
 930
 931         gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
 932
 933         spin_lock_irqsave(&port->port_lock, flags);
 934
 935         if (port->port_dev == NULL) {
 936                 printk(KERN_ERR
 937                         "gs_flush_chars: (%d,%p) port is not connected\n",
 938                         port->port_num, tty);
 939                 goto exit;
 940         }
 941
 942         if (port->port_open_count == 0) {
 943                 printk(KERN_ERR "gs_flush_chars: (%d,%p) port is closed\n",
 944                         port->port_num, tty);
 945                 goto exit;
 946         }
 947
 948         spin_unlock_irqrestore(&port->port_lock, flags);
 949
 950         gs_send(gs_device);
 951
 952         return;
 953
 954 exit:
 955         spin_unlock_irqrestore(&port->port_lock, flags);
 956 }
 957
 958 /*
 959  * gs_write_room
 960  */
 961 static int gs_write_room(struct tty_struct *tty)
 962 {
 963
 964         int room = 0;
 965         unsigned long flags;
 966         struct gs_port *port = tty->driver_data;
 967
 968
 969         if (port == NULL)
 970                 return 0;
 971
 972         spin_lock_irqsave(&port->port_lock, flags);
 973
 974         if (port->port_dev != NULL && port->port_open_count > 0
 975         && port->port_write_buf != NULL)
 976                 room = gs_buf_space_avail(port->port_write_buf);
 977
 978         spin_unlock_irqrestore(&port->port_lock, flags);
 979
 980         gs_debug("gs_write_room: (%d,%p) room=%d\n",
 981                 port->port_num, tty, room);
 982
 983         return room;
 984 }
 985
 986 /*
 987  * gs_chars_in_buffer
 988  */
 989 static int gs_chars_in_buffer(struct tty_struct *tty)
 990 {
 991         int chars = 0;
 992         unsigned long flags;
 993         struct gs_port *port = tty->driver_data;
 994
 995         if (port == NULL)
 996                 return 0;
 997
 998         spin_lock_irqsave(&port->port_lock, flags);
 999
1000         if (port->port_dev != NULL && port->port_open_count > 0
1001         && port->port_write_buf != NULL)
1002                 chars = gs_buf_data_avail(port->port_write_buf);
1003
1004         spin_unlock_irqrestore(&port->port_lock, flags);
1005
1006         gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
1007                 port->port_num, tty, chars);
1008
1009         return chars;
1010 }
1011
1012 /*
1013  * gs_throttle
1014  */
1015 static void gs_throttle(struct tty_struct *tty)
1016 {
1017 }
1018
1019 /*
1020  * gs_unthrottle
1021  */
1022 static void gs_unthrottle(struct tty_struct *tty)
1023 {
1024 }
1025
1026 /*
1027  * gs_break
1028  */
1029 static void gs_break(struct tty_struct *tty, int break_state)
1030 {
1031 }
1032
1033 /*
1034  * gs_ioctl
1035  */
1036 static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1037 {
1038         struct gs_port *port = tty->driver_data;
1039
1040         if (port == NULL) {
1041                 printk(KERN_ERR "gs_ioctl: NULL port pointer\n");
1042                 return -EIO;
1043         }
1044
1045         gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
1046                 port->port_num, tty, file, cmd, arg);
1047
1048         /* handle ioctls */
1049
1050         /* could not handle ioctl */
1051         return -ENOIOCTLCMD;
1052 }
1053
1054 /*
1055  * gs_set_termios
1056  */
1057 static void gs_set_termios(struct tty_struct *tty, struct ktermios *old)
1058 {
1059 }
1060
1061 /*
1062 * gs_send
1063 *
1064 * This function finds available write requests, calls
1065 * gs_send_packet to fill these packets with data, and
1066 * continues until either there are no more write requests
1067 * available or no more data to send.  This function is
1068 * run whenever data arrives or write requests are available.
1069 */
1070 static int gs_send(struct gs_dev *dev)
1071 {
1072         int ret,len;
1073         unsigned long flags;
1074         struct usb_ep *ep;
1075         struct usb_request *req;
1076         struct gs_req_entry *req_entry;
1077
1078         if (dev == NULL) {
1079                 printk(KERN_ERR "gs_send: NULL device pointer\n");
1080                 return -ENODEV;
1081         }
1082
1083         spin_lock_irqsave(&dev->dev_lock, flags);
1084
1085         ep = dev->dev_in_ep;
1086
1087         while(!list_empty(&dev->dev_req_list)) {
1088
1089                 req_entry = list_entry(dev->dev_req_list.next,
1090                         struct gs_req_entry, re_entry);
1091
1092                 req = req_entry->re_req;
1093
1094                 len = gs_send_packet(dev, req->buf, ep->maxpacket);
1095
1096                 if (len > 0) {
1097                         gs_debug_level(3, "gs_send: len=%d, 0x%2.2x "
1098                                         "0x%2.2x 0x%2.2x ...\n", len,
1099                                         *((unsigned char *)req->buf),
1100                                         *((unsigned char *)req->buf+1),
1101                                         *((unsigned char *)req->buf+2));
1102                         list_del(&req_entry->re_entry);
1103                         req->length = len;
1104                         spin_unlock_irqrestore(&dev->dev_lock, flags);
1105                         if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1106                                 printk(KERN_ERR
1107                                 "gs_send: cannot queue read request, ret=%d\n",
1108                                         ret);
1109                                 spin_lock_irqsave(&dev->dev_lock, flags);
1110                                 break;
1111                         }
1112                         spin_lock_irqsave(&dev->dev_lock, flags);
1113                 } else {
1114                         break;
1115                 }
1116
1117         }
1118
1119         spin_unlock_irqrestore(&dev->dev_lock, flags);
1120
1121         return 0;
1122 }
1123
1124 /*
1125  * gs_send_packet
1126  *
1127  * If there is data to send, a packet is built in the given
1128  * buffer and the size is returned.  If there is no data to
1129  * send, 0 is returned.  If there is any error a negative
1130  * error number is returned.
1131  *
1132  * Called during USB completion routine, on interrupt time.
1133  *
1134  * We assume that disconnect will not happen until all completion
1135  * routines have completed, so we can assume that the dev_port
1136  * array does not change during the lifetime of this function.
1137  */
1138 static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
1139 {
1140         unsigned int len;
1141         struct gs_port *port;
1142
1143         /* TEMPORARY -- only port 0 is supported right now */
1144         port = dev->dev_port[0];
1145
1146         if (port == NULL) {
1147                 printk(KERN_ERR
1148                         "gs_send_packet: port=%d, NULL port pointer\n",
1149                         0);
1150                 return -EIO;
1151         }
1152
1153         spin_lock(&port->port_lock);
1154
1155         len = gs_buf_data_avail(port->port_write_buf);
1156         if (len < size)
1157                 size = len;
1158
1159         if (size == 0)
1160                 goto exit;
1161
1162         size = gs_buf_get(port->port_write_buf, packet, size);
1163
1164         if (port->port_tty)
1165                 wake_up_interruptible(&port->port_tty->write_wait);
1166
1167 exit:
1168         spin_unlock(&port->port_lock);
1169         return size;
1170 }
1171
1172 /*
1173  * gs_recv_packet
1174  *
1175  * Called for each USB packet received.  Reads the packet
1176  * header and stuffs the data in the appropriate tty buffer.
1177  * Returns 0 if successful, or a negative error number.
1178  *
1179  * Called during USB completion routine, on interrupt time.
1180  *
1181  * We assume that disconnect will not happen until all completion
1182  * routines have completed, so we can assume that the dev_port
1183  * array does not change during the lifetime of this function.
1184  */
1185 static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
1186 {
1187         unsigned int len;
1188         struct gs_port *port;
1189         int ret;
1190         struct tty_struct *tty;
1191
1192         /* TEMPORARY -- only port 0 is supported right now */
1193         port = dev->dev_port[0];
1194
1195         if (port == NULL) {
1196                 printk(KERN_ERR "gs_recv_packet: port=%d, NULL port pointer\n",
1197                         port->port_num);
1198                 return -EIO;
1199         }
1200
1201         spin_lock(&port->port_lock);
1202
1203         if (port->port_open_count == 0) {
1204                 printk(KERN_ERR "gs_recv_packet: port=%d, port is closed\n",
1205                         port->port_num);
1206                 ret = -EIO;
1207                 goto exit;
1208         }
1209
1210
1211         tty = port->port_tty;
1212
1213         if (tty == NULL) {
1214                 printk(KERN_ERR "gs_recv_packet: port=%d, NULL tty pointer\n",
1215                         port->port_num);
1216                 ret = -EIO;
1217                 goto exit;
1218         }
1219
1220         if (port->port_tty->magic != TTY_MAGIC) {
1221                 printk(KERN_ERR "gs_recv_packet: port=%d, bad tty magic\n",
1222                         port->port_num);
1223                 ret = -EIO;
1224                 goto exit;
1225         }
1226
1227         len = tty_buffer_request_room(tty, size);
1228         if (len > 0) {
1229                 tty_insert_flip_string(tty, packet, len);
1230                 tty_flip_buffer_push(port->port_tty);
1231                 wake_up_interruptible(&port->port_tty->read_wait);
1232         }
1233         ret = 0;
1234 exit:
1235         spin_unlock(&port->port_lock);
1236         return ret;
1237 }
1238
1239 /*
1240 * gs_read_complete
1241 */
1242 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
1243 {
1244         int ret;
1245         struct gs_dev *dev = ep->driver_data;
1246
1247         if (dev == NULL) {
1248                 printk(KERN_ERR "gs_read_complete: NULL device pointer\n");
1249                 return;
1250         }
1251
1252         switch(req->status) {
1253         case 0:
1254                 /* normal completion */
1255                 gs_recv_packet(dev, req->buf, req->actual);
1256 requeue:
1257                 req->length = ep->maxpacket;
1258                 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1259                         printk(KERN_ERR
1260                         "gs_read_complete: cannot queue read request, ret=%d\n",
1261                                 ret);
1262                 }
1263                 break;
1264
1265         case -ESHUTDOWN:
1266                 /* disconnect */
1267                 gs_debug("gs_read_complete: shutdown\n");
1268                 gs_free_req(ep, req);
1269                 break;
1270
1271         default:
1272                 /* unexpected */
1273                 printk(KERN_ERR
1274                 "gs_read_complete: unexpected status error, status=%d\n",
1275                         req->status);
1276                 goto requeue;
1277                 break;
1278         }
1279 }
1280
1281 /*
1282 * gs_write_complete
1283 */
1284 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
1285 {
1286         struct gs_dev *dev = ep->driver_data;
1287         struct gs_req_entry *gs_req = req->context;
1288
1289         if (dev == NULL) {
1290                 printk(KERN_ERR "gs_write_complete: NULL device pointer\n");
1291                 return;
1292         }
1293
1294         switch(req->status) {
1295         case 0:
1296                 /* normal completion */
1297 requeue:
1298                 if (gs_req == NULL) {
1299                         printk(KERN_ERR
1300                                 "gs_write_complete: NULL request pointer\n");
1301                         return;
1302                 }
1303
1304                 spin_lock(&dev->dev_lock);
1305                 list_add(&gs_req->re_entry, &dev->dev_req_list);
1306                 spin_unlock(&dev->dev_lock);
1307
1308                 gs_send(dev);
1309
1310                 break;
1311
1312         case -ESHUTDOWN:
1313                 /* disconnect */
1314                 gs_debug("gs_write_complete: shutdown\n");
1315                 gs_free_req(ep, req);
1316                 break;
1317
1318         default:
1319                 printk(KERN_ERR
1320                 "gs_write_complete: unexpected status error, status=%d\n",
1321                         req->status);
1322                 goto requeue;
1323                 break;
1324         }
1325 }
1326
1327 /* Gadget Driver */
1328
1329 /*
1330  * gs_bind
1331  *
1332  * Called on module load.  Allocates and initializes the device
1333  * structure and a control request.
1334  */
1335 static int __init gs_bind(struct usb_gadget *gadget)
1336 {
1337         int ret;
1338         struct usb_ep *ep;
1339         struct gs_dev *dev;
1340         int gcnum;
1341
1342         /* Some controllers can't support CDC ACM:
1343          * - sh doesn't support multiple interfaces or configs;
1344          * - sa1100 doesn't have a third interrupt endpoint
1345          */
1346         if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget))
1347                 use_acm = 0;
1348
1349         gcnum = usb_gadget_controller_number(gadget);
1350         if (gcnum >= 0)
1351                 gs_device_desc.bcdDevice =
1352                                 cpu_to_le16(GS_VERSION_NUM | gcnum);
1353         else {
1354                 printk(KERN_WARNING "gs_bind: controller '%s' not recognized\n",
1355                         gadget->name);
1356                 /* unrecognized, but safe unless bulk is REALLY quirky */
1357                 gs_device_desc.bcdDevice =
1358                         __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
1359         }
1360
1361         usb_ep_autoconfig_reset(gadget);
1362
1363         ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
1364         if (!ep)
1365                 goto autoconf_fail;
1366         EP_IN_NAME = ep->name;
1367         ep->driver_data = ep;   /* claim the endpoint */
1368
1369         ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
1370         if (!ep)
1371                 goto autoconf_fail;
1372         EP_OUT_NAME = ep->name;
1373         ep->driver_data = ep;   /* claim the endpoint */
1374
1375         if (use_acm) {
1376                 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
1377                 if (!ep) {
1378                         printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
1379                         goto autoconf_fail;
1380                 }
1381                 gs_device_desc.idProduct = __constant_cpu_to_le16(
1382                                                 GS_CDC_PRODUCT_ID),
1383                 EP_NOTIFY_NAME = ep->name;
1384                 ep->driver_data = ep;   /* claim the endpoint */
1385         }
1386
1387         gs_device_desc.bDeviceClass = use_acm
1388                 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1389         gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1390
1391         if (gadget_is_dualspeed(gadget)) {
1392                 gs_qualifier_desc.bDeviceClass = use_acm
1393                         ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1394                 /* assume ep0 uses the same packet size for both speeds */
1395                 gs_qualifier_desc.bMaxPacketSize0 =
1396                         gs_device_desc.bMaxPacketSize0;
1397                 /* assume endpoints are dual-speed */
1398                 gs_highspeed_notify_desc.bEndpointAddress =
1399                         gs_fullspeed_notify_desc.bEndpointAddress;
1400                 gs_highspeed_in_desc.bEndpointAddress =
1401                         gs_fullspeed_in_desc.bEndpointAddress;
1402                 gs_highspeed_out_desc.bEndpointAddress =
1403                         gs_fullspeed_out_desc.bEndpointAddress;
1404         }
1405
1406         usb_gadget_set_selfpowered(gadget);
1407
1408         if (gadget_is_otg(gadget)) {
1409                 gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
1410                 gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1411                 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1412         }
1413
1414         gs_device = dev = kzalloc(sizeof(struct gs_dev), GFP_KERNEL);
1415         if (dev == NULL)
1416                 return -ENOMEM;
1417
1418         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1419                 init_utsname()->sysname, init_utsname()->release,
1420                 gadget->name);
1421
1422         dev->dev_gadget = gadget;
1423         spin_lock_init(&dev->dev_lock);
1424         INIT_LIST_HEAD(&dev->dev_req_list);
1425         set_gadget_data(gadget, dev);
1426
1427         if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
1428                 printk(KERN_ERR "gs_bind: cannot allocate ports\n");
1429                 gs_unbind(gadget);
1430                 return ret;
1431         }
1432
1433         /* preallocate control response and buffer */
1434         dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
1435                 GFP_KERNEL);
1436         if (dev->dev_ctrl_req == NULL) {
1437                 gs_unbind(gadget);
1438                 return -ENOMEM;
1439         }
1440         dev->dev_ctrl_req->complete = gs_setup_complete;
1441
1442         gadget->ep0->driver_data = dev;
1443
1444         printk(KERN_INFO "gs_bind: %s %s bound\n",
1445                 GS_LONG_NAME, GS_VERSION_STR);
1446
1447         return 0;
1448
1449 autoconf_fail:
1450         printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
1451         return -ENODEV;
1452 }
1453
1454 /*
1455  * gs_unbind
1456  *
1457  * Called on module unload.  Frees the control request and device
1458  * structure.
1459  */
1460 static void /* __init_or_exit */ gs_unbind(struct usb_gadget *gadget)
1461 {
1462         struct gs_dev *dev = get_gadget_data(gadget);
1463
1464         gs_device = NULL;
1465
1466         /* read/write requests already freed, only control request remains */
1467         if (dev != NULL) {
1468                 if (dev->dev_ctrl_req != NULL) {
1469                         gs_free_req(gadget->ep0, dev->dev_ctrl_req);
1470                         dev->dev_ctrl_req = NULL;
1471                 }
1472                 gs_free_ports(dev);
1473                 if (dev->dev_notify_ep)
1474                         usb_ep_disable(dev->dev_notify_ep);
1475                 if (dev->dev_in_ep)
1476                         usb_ep_disable(dev->dev_in_ep);
1477                 if (dev->dev_out_ep)
1478                         usb_ep_disable(dev->dev_out_ep);
1479                 kfree(dev);
1480                 set_gadget_data(gadget, NULL);
1481         }
1482
1483         printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
1484                 GS_VERSION_STR);
1485 }
1486
1487 /*
1488  * gs_setup
1489  *
1490  * Implements all the control endpoint functionality that's not
1491  * handled in hardware or the hardware driver.
1492  *
1493  * Returns the size of the data sent to the host, or a negative
1494  * error number.
1495  */
1496 static int gs_setup(struct usb_gadget *gadget,
1497         const struct usb_ctrlrequest *ctrl)
1498 {
1499         int ret = -EOPNOTSUPP;
1500         struct gs_dev *dev = get_gadget_data(gadget);
1501         struct usb_request *req = dev->dev_ctrl_req;
1502         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1503         u16 wValue = le16_to_cpu(ctrl->wValue);
1504         u16 wLength = le16_to_cpu(ctrl->wLength);
1505
1506         switch (ctrl->bRequestType & USB_TYPE_MASK) {
1507         case USB_TYPE_STANDARD:
1508                 ret = gs_setup_standard(gadget,ctrl);
1509                 break;
1510
1511         case USB_TYPE_CLASS:
1512                 ret = gs_setup_class(gadget,ctrl);
1513                 break;
1514
1515         default:
1516                 printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1517                         ctrl->bRequestType, ctrl->bRequest,
1518                         wValue, wIndex, wLength);
1519                 break;
1520         }
1521
1522         /* respond with data transfer before status phase? */
1523         if (ret >= 0) {
1524                 req->length = ret;
1525                 req->zero = ret < wLength
1526                                 && (ret % gadget->ep0->maxpacket) == 0;
1527                 ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1528                 if (ret < 0) {
1529                         printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
1530                                 ret);
1531                         req->status = 0;
1532                         gs_setup_complete(gadget->ep0, req);
1533                 }
1534         }
1535
1536         /* device either stalls (ret < 0) or reports success */
1537         return ret;
1538 }
1539
1540 static int gs_setup_standard(struct usb_gadget *gadget,
1541         const struct usb_ctrlrequest *ctrl)
1542 {
1543         int ret = -EOPNOTSUPP;
1544         struct gs_dev *dev = get_gadget_data(gadget);
1545         struct usb_request *req = dev->dev_ctrl_req;
1546         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1547         u16 wValue = le16_to_cpu(ctrl->wValue);
1548         u16 wLength = le16_to_cpu(ctrl->wLength);
1549
1550         switch (ctrl->bRequest) {
1551         case USB_REQ_GET_DESCRIPTOR:
1552                 if (ctrl->bRequestType != USB_DIR_IN)
1553                         break;
1554
1555                 switch (wValue >> 8) {
1556                 case USB_DT_DEVICE:
1557                         ret = min(wLength,
1558                                 (u16)sizeof(struct usb_device_descriptor));
1559                         memcpy(req->buf, &gs_device_desc, ret);
1560                         break;
1561
1562                 case USB_DT_DEVICE_QUALIFIER:
1563                         if (!gadget_is_dualspeed(gadget))
1564                                 break;
1565                         ret = min(wLength,
1566                                 (u16)sizeof(struct usb_qualifier_descriptor));
1567                         memcpy(req->buf, &gs_qualifier_desc, ret);
1568                         break;
1569
1570                 case USB_DT_OTHER_SPEED_CONFIG:
1571                         if (!gadget_is_dualspeed(gadget))
1572                                 break;
1573                         /* fall through */
1574                 case USB_DT_CONFIG:
1575                         ret = gs_build_config_buf(req->buf, gadget,
1576                                 wValue >> 8, wValue & 0xff,
1577                                 gadget_is_otg(gadget));
1578                         if (ret >= 0)
1579                                 ret = min(wLength, (u16)ret);
1580                         break;
1581
1582                 case USB_DT_STRING:
1583                         /* wIndex == language code. */
1584                         ret = usb_gadget_get_string(&gs_string_table,
1585                                 wValue & 0xff, req->buf);
1586                         if (ret >= 0)
1587                                 ret = min(wLength, (u16)ret);
1588                         break;
1589                 }
1590                 break;
1591
1592         case USB_REQ_SET_CONFIGURATION:
1593                 if (ctrl->bRequestType != 0)
1594                         break;
1595                 spin_lock(&dev->dev_lock);
1596                 ret = gs_set_config(dev, wValue);
1597                 spin_unlock(&dev->dev_lock);
1598                 break;
1599
1600         case USB_REQ_GET_CONFIGURATION:
1601                 if (ctrl->bRequestType != USB_DIR_IN)
1602                         break;
1603                 *(u8 *)req->buf = dev->dev_config;
1604                 ret = min(wLength, (u16)1);
1605                 break;
1606
1607         case USB_REQ_SET_INTERFACE:
1608                 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1609                                 || !dev->dev_config
1610                                 || wIndex >= GS_MAX_NUM_INTERFACES)
1611                         break;
1612                 if (dev->dev_config == GS_BULK_CONFIG_ID
1613                                 && wIndex != GS_BULK_INTERFACE_ID)
1614                         break;
1615                 /* no alternate interface settings */
1616                 if (wValue != 0)
1617                         break;
1618                 spin_lock(&dev->dev_lock);
1619                 /* PXA hardware partially handles SET_INTERFACE;
1620                  * we need to kluge around that interference.  */
1621                 if (gadget_is_pxa(gadget)) {
1622                         ret = gs_set_config(dev, use_acm ?
1623                                 GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
1624                         goto set_interface_done;
1625                 }
1626                 if (dev->dev_config != GS_BULK_CONFIG_ID
1627                                 && wIndex == GS_CONTROL_INTERFACE_ID) {
1628                         if (dev->dev_notify_ep) {
1629                                 usb_ep_disable(dev->dev_notify_ep);
1630                                 usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
1631                         }
1632                 } else {
1633                         usb_ep_disable(dev->dev_in_ep);
1634                         usb_ep_disable(dev->dev_out_ep);
1635                         usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
1636                         usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
1637                 }
1638                 ret = 0;
1639 set_interface_done:
1640                 spin_unlock(&dev->dev_lock);
1641                 break;
1642
1643         case USB_REQ_GET_INTERFACE:
1644                 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1645                 || dev->dev_config == GS_NO_CONFIG_ID)
1646                         break;
1647                 if (wIndex >= GS_MAX_NUM_INTERFACES
1648                                 || (dev->dev_config == GS_BULK_CONFIG_ID
1649                                 && wIndex != GS_BULK_INTERFACE_ID)) {
1650                         ret = -EDOM;
1651                         break;
1652                 }
1653                 /* no alternate interface settings */
1654                 *(u8 *)req->buf = 0;
1655                 ret = min(wLength, (u16)1);
1656                 break;
1657
1658         default:
1659                 printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1660                         ctrl->bRequestType, ctrl->bRequest,
1661                         wValue, wIndex, wLength);
1662                 break;
1663         }
1664
1665         return ret;
1666 }
1667
1668 static int gs_setup_class(struct usb_gadget *gadget,
1669         const struct usb_ctrlrequest *ctrl)
1670 {
1671         int ret = -EOPNOTSUPP;
1672         struct gs_dev *dev = get_gadget_data(gadget);
1673         struct gs_port *port = dev->dev_port[0];        /* ACM only has one port */
1674         struct usb_request *req = dev->dev_ctrl_req;
1675         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1676         u16 wValue = le16_to_cpu(ctrl->wValue);
1677         u16 wLength = le16_to_cpu(ctrl->wLength);
1678
1679         switch (ctrl->bRequest) {
1680         case USB_CDC_REQ_SET_LINE_CODING:
1681                 /* FIXME Submit req to read the data; have its completion
1682                  * handler copy that data to port->port_line_coding (iff
1683                  * it's valid) and maybe pass it on.  Until then, fail.
1684                  */
1685                 printk(KERN_WARNING "gs_setup: set_line_coding "
1686                                 "unuspported\n");
1687                 break;
1688
1689         case USB_CDC_REQ_GET_LINE_CODING:
1690                 port = dev->dev_port[0];        /* ACM only has one port */
1691                 ret = min(wLength,
1692                         (u16)sizeof(struct usb_cdc_line_coding));
1693                 if (port) {
1694                         spin_lock(&port->port_lock);
1695                         memcpy(req->buf, &port->port_line_coding, ret);
1696                         spin_unlock(&port->port_lock);
1697                 }
1698                 break;
1699
1700         case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
1701                 /* FIXME Submit req to read the data; have its completion
1702                  * handler use that to set the state (iff it's valid) and
1703                  * maybe pass it on.  Until then, fail.
1704                  */
1705                 printk(KERN_WARNING "gs_setup: set_control_line_state "
1706                                 "unuspported\n");
1707                 break;
1708
1709         default:
1710                 printk(KERN_ERR "gs_setup: unknown class request, "
1711                                 "type=%02x, request=%02x, value=%04x, "
1712                                 "index=%04x, length=%d\n",
1713                         ctrl->bRequestType, ctrl->bRequest,
1714                         wValue, wIndex, wLength);
1715                 break;
1716         }
1717
1718         return ret;
1719 }
1720
1721 /*
1722  * gs_setup_complete
1723  */
1724 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
1725 {
1726         if (req->status || req->actual != req->length) {
1727                 printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
1728                         req->status, req->actual, req->length);
1729         }
1730 }
1731
1732 /*
1733  * gs_disconnect
1734  *
1735  * Called when the device is disconnected.  Frees the closed
1736  * ports and disconnects open ports.  Open ports will be freed
1737  * on close.  Then reallocates the ports for the next connection.
1738  */
1739 static void gs_disconnect(struct usb_gadget *gadget)
1740 {
1741         unsigned long flags;
1742         struct gs_dev *dev = get_gadget_data(gadget);
1743
1744         spin_lock_irqsave(&dev->dev_lock, flags);
1745
1746         gs_reset_config(dev);
1747
1748         /* free closed ports and disconnect open ports */
1749         /* (open ports will be freed when closed) */
1750         gs_free_ports(dev);
1751
1752         /* re-allocate ports for the next connection */
1753         if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
1754                 printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
1755
1756         spin_unlock_irqrestore(&dev->dev_lock, flags);
1757
1758         printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
1759 }
1760
1761 /*
1762  * gs_set_config
1763  *
1764  * Configures the device by enabling device specific
1765  * optimizations, setting up the endpoints, allocating
1766  * read and write requests and queuing read requests.
1767  *
1768  * The device lock must be held when calling this function.
1769  */
1770 static int gs_set_config(struct gs_dev *dev, unsigned config)
1771 {
1772         int i;
1773         int ret = 0;
1774         struct usb_gadget *gadget = dev->dev_gadget;
1775         struct usb_ep *ep;
1776         struct usb_endpoint_descriptor *ep_desc;
1777         struct usb_request *req;
1778         struct gs_req_entry *req_entry;
1779
1780         if (dev == NULL) {
1781                 printk(KERN_ERR "gs_set_config: NULL device pointer\n");
1782                 return 0;
1783         }
1784
1785         if (config == dev->dev_config)
1786                 return 0;
1787
1788         gs_reset_config(dev);
1789
1790         switch (config) {
1791         case GS_NO_CONFIG_ID:
1792                 return 0;
1793         case GS_BULK_CONFIG_ID:
1794                 if (use_acm)
1795                         return -EINVAL;
1796                 /* device specific optimizations */
1797                 if (gadget_is_net2280(gadget))
1798                         net2280_set_fifo_mode(gadget, 1);
1799                 break;
1800         case GS_ACM_CONFIG_ID:
1801                 if (!use_acm)
1802                         return -EINVAL;
1803                 /* device specific optimizations */
1804                 if (gadget_is_net2280(gadget))
1805                         net2280_set_fifo_mode(gadget, 1);
1806                 break;
1807         default:
1808                 return -EINVAL;
1809         }
1810
1811         dev->dev_config = config;
1812
1813         gadget_for_each_ep(ep, gadget) {
1814
1815                 if (EP_NOTIFY_NAME
1816                 && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
1817                         ep_desc = choose_ep_desc(gadget,
1818                                 &gs_highspeed_notify_desc,
1819                                 &gs_fullspeed_notify_desc);
1820                         ret = usb_ep_enable(ep,ep_desc);
1821                         if (ret == 0) {
1822                                 ep->driver_data = dev;
1823                                 dev->dev_notify_ep = ep;
1824                                 dev->dev_notify_ep_desc = ep_desc;
1825                         } else {
1826                                 printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
1827                                         ep->name, ret);
1828                                 goto exit_reset_config;
1829                         }
1830                 }
1831
1832                 else if (strcmp(ep->name, EP_IN_NAME) == 0) {
1833                         ep_desc = choose_ep_desc(gadget,
1834                                 &gs_highspeed_in_desc,
1835                                 &gs_fullspeed_in_desc);
1836                         ret = usb_ep_enable(ep,ep_desc);
1837                         if (ret == 0) {
1838                                 ep->driver_data = dev;
1839                                 dev->dev_in_ep = ep;
1840                                 dev->dev_in_ep_desc = ep_desc;
1841                         } else {
1842                                 printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
1843                                         ep->name, ret);
1844                                 goto exit_reset_config;
1845                         }
1846                 }
1847
1848                 else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
1849                         ep_desc = choose_ep_desc(gadget,
1850                                 &gs_highspeed_out_desc,
1851                                 &gs_fullspeed_out_desc);
1852                         ret = usb_ep_enable(ep,ep_desc);
1853                         if (ret == 0) {
1854                                 ep->driver_data = dev;
1855                                 dev->dev_out_ep = ep;
1856                                 dev->dev_out_ep_desc = ep_desc;
1857                         } else {
1858                                 printk(KERN_ERR "gs_set_config: cannot enable out endpoint %s, ret=%d\n",
1859                                         ep->name, ret);
1860                                 goto exit_reset_config;
1861                         }
1862                 }
1863
1864         }
1865
1866         if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
1867         || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
1868                 printk(KERN_ERR "gs_set_config: cannot find endpoints\n");
1869                 ret = -ENODEV;
1870                 goto exit_reset_config;
1871         }
1872
1873         /* allocate and queue read requests */
1874         ep = dev->dev_out_ep;
1875         for (i=0; i<read_q_size && ret == 0; i++) {
1876                 if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
1877                         req->complete = gs_read_complete;
1878                         if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1879                                 printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
1880                                         ret);
1881                         }
1882                 } else {
1883                         printk(KERN_ERR "gs_set_config: cannot allocate read requests\n");
1884                         ret = -ENOMEM;
1885                         goto exit_reset_config;
1886                 }
1887         }
1888
1889         /* allocate write requests, and put on free list */
1890         ep = dev->dev_in_ep;
1891         for (i=0; i<write_q_size; i++) {
1892                 if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
1893                         req_entry->re_req->complete = gs_write_complete;
1894                         list_add(&req_entry->re_entry, &dev->dev_req_list);
1895                 } else {
1896                         printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
1897                         ret = -ENOMEM;
1898                         goto exit_reset_config;
1899                 }
1900         }
1901
1902         printk(KERN_INFO "gs_set_config: %s configured, %s speed %s config\n",
1903                 GS_LONG_NAME,
1904                 gadget->speed == USB_SPEED_HIGH ? "high" : "full",
1905                 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
1906
1907         return 0;
1908
1909 exit_reset_config:
1910         gs_reset_config(dev);
1911         return ret;
1912 }
1913
1914 /*
1915  * gs_reset_config
1916  *
1917  * Mark the device as not configured, disable all endpoints,
1918  * which forces completion of pending I/O and frees queued
1919  * requests, and free the remaining write requests on the
1920  * free list.
1921  *
1922  * The device lock must be held when calling this function.
1923  */
1924 static void gs_reset_config(struct gs_dev *dev)
1925 {
1926         struct gs_req_entry *req_entry;
1927
1928         if (dev == NULL) {
1929                 printk(KERN_ERR "gs_reset_config: NULL device pointer\n");
1930                 return;
1931         }
1932
1933         if (dev->dev_config == GS_NO_CONFIG_ID)
1934                 return;
1935
1936         dev->dev_config = GS_NO_CONFIG_ID;
1937
1938         /* free write requests on the free list */
1939         while(!list_empty(&dev->dev_req_list)) {
1940                 req_entry = list_entry(dev->dev_req_list.next,
1941                         struct gs_req_entry, re_entry);
1942                 list_del(&req_entry->re_entry);
1943                 gs_free_req_entry(dev->dev_in_ep, req_entry);
1944         }
1945
1946         /* disable endpoints, forcing completion of pending i/o; */
1947         /* completion handlers free their requests in this case */
1948         if (dev->dev_notify_ep) {
1949                 usb_ep_disable(dev->dev_notify_ep);
1950                 dev->dev_notify_ep = NULL;
1951         }
1952         if (dev->dev_in_ep) {
1953                 usb_ep_disable(dev->dev_in_ep);
1954                 dev->dev_in_ep = NULL;
1955         }
1956         if (dev->dev_out_ep) {
1957                 usb_ep_disable(dev->dev_out_ep);
1958                 dev->dev_out_ep = NULL;
1959         }
1960 }
1961
1962 /*
1963  * gs_build_config_buf
1964  *
1965  * Builds the config descriptors in the given buffer and returns the
1966  * length, or a negative error number.
1967  */
1968 static int gs_build_config_buf(u8 *buf, struct usb_gadget *g,
1969         u8 type, unsigned int index, int is_otg)
1970 {
1971         int len;
1972         int high_speed = 0;
1973         const struct usb_config_descriptor *config_desc;
1974         const struct usb_descriptor_header **function;
1975
1976         if (index >= gs_device_desc.bNumConfigurations)
1977                 return -EINVAL;
1978
1979         /* other speed switches high and full speed */
1980         if (gadget_is_dualspeed(g)) {
1981                 high_speed = (g->speed == USB_SPEED_HIGH);
1982                 if (type == USB_DT_OTHER_SPEED_CONFIG)
1983                         high_speed = !high_speed;
1984         }
1985
1986         if (use_acm) {
1987                 config_desc = &gs_acm_config_desc;
1988                 function = high_speed
1989                         ? gs_acm_highspeed_function
1990                         : gs_acm_fullspeed_function;
1991         } else {
1992                 config_desc = &gs_bulk_config_desc;
1993                 function = high_speed
1994                         ? gs_bulk_highspeed_function
1995                         : gs_bulk_fullspeed_function;
1996         }
1997
1998         /* for now, don't advertise srp-only devices */
1999         if (!is_otg)
2000                 function++;
2001
2002         len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
2003         if (len < 0)
2004                 return len;
2005
2006         ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
2007
2008         return len;
2009 }
2010
2011 /*
2012  * gs_alloc_req
2013  *
2014  * Allocate a usb_request and its buffer.  Returns a pointer to the
2015  * usb_request or NULL if there is an error.
2016  */
2017 static struct usb_request *
2018 gs_alloc_req(struct usb_ep *ep, unsigned int len, gfp_t kmalloc_flags)
2019 {
2020         struct usb_request *req;
2021
2022         if (ep == NULL)
2023                 return NULL;
2024
2025         req = usb_ep_alloc_request(ep, kmalloc_flags);
2026
2027         if (req != NULL) {
2028                 req->length = len;
2029                 req->buf = kmalloc(len, kmalloc_flags);
2030                 if (req->buf == NULL) {
2031                         usb_ep_free_request(ep, req);
2032                         return NULL;
2033                 }
2034         }
2035
2036         return req;
2037 }
2038
2039 /*
2040  * gs_free_req
2041  *
2042  * Free a usb_request and its buffer.
2043  */
2044 static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
2045 {
2046         if (ep != NULL && req != NULL) {
2047                 kfree(req->buf);
2048                 usb_ep_free_request(ep, req);
2049         }
2050 }
2051
2052 /*
2053  * gs_alloc_req_entry
2054  *
2055  * Allocates a request and its buffer, using the given
2056  * endpoint, buffer len, and kmalloc flags.
2057  */
2058 static struct gs_req_entry *
2059 gs_alloc_req_entry(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
2060 {
2061         struct gs_req_entry     *req;
2062
2063         req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
2064         if (req == NULL)
2065                 return NULL;
2066
2067         req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
2068         if (req->re_req == NULL) {
2069                 kfree(req);
2070                 return NULL;
2071         }
2072
2073         req->re_req->context = req;
2074
2075         return req;
2076 }
2077
2078 /*
2079  * gs_free_req_entry
2080  *
2081  * Frees a request and its buffer.
2082  */
2083 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
2084 {
2085         if (ep != NULL && req != NULL) {
2086                 if (req->re_req != NULL)
2087                         gs_free_req(ep, req->re_req);
2088                 kfree(req);
2089         }
2090 }
2091
2092 /*
2093  * gs_alloc_ports
2094  *
2095  * Allocate all ports and set the gs_dev struct to point to them.
2096  * Return 0 if successful, or a negative error number.
2097  *
2098  * The device lock is normally held when calling this function.
2099  */
2100 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags)
2101 {
2102         int i;
2103         struct gs_port *port;
2104
2105         if (dev == NULL)
2106                 return -EIO;
2107
2108         for (i=0; i<GS_NUM_PORTS; i++) {
2109                 if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
2110                         return -ENOMEM;
2111
2112                 port->port_dev = dev;
2113                 port->port_num = i;
2114                 port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
2115                 port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
2116                 port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
2117                 port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
2118                 spin_lock_init(&port->port_lock);
2119                 init_waitqueue_head(&port->port_write_wait);
2120
2121                 dev->dev_port[i] = port;
2122         }
2123
2124         return 0;
2125 }
2126
2127 /*
2128  * gs_free_ports
2129  *
2130  * Free all closed ports.  Open ports are disconnected by
2131  * freeing their write buffers, setting their device pointers
2132  * and the pointers to them in the device to NULL.  These
2133  * ports will be freed when closed.
2134  *
2135  * The device lock is normally held when calling this function.
2136  */
2137 static void gs_free_ports(struct gs_dev *dev)
2138 {
2139         int i;
2140         unsigned long flags;
2141         struct gs_port *port;
2142
2143         if (dev == NULL)
2144                 return;
2145
2146         for (i=0; i<GS_NUM_PORTS; i++) {
2147                 if ((port=dev->dev_port[i]) != NULL) {
2148                         dev->dev_port[i] = NULL;
2149
2150                         spin_lock_irqsave(&port->port_lock, flags);
2151
2152                         if (port->port_write_buf != NULL) {
2153                                 gs_buf_free(port->port_write_buf);
2154                                 port->port_write_buf = NULL;
2155                         }
2156
2157                         if (port->port_open_count > 0 || port->port_in_use) {
2158                                 port->port_dev = NULL;
2159                                 wake_up_interruptible(&port->port_write_wait);
2160                                 if (port->port_tty) {
2161                                         wake_up_interruptible(&port->port_tty->read_wait);
2162                                         wake_up_interruptible(&port->port_tty->write_wait);
2163                                 }
2164                                 spin_unlock_irqrestore(&port->port_lock, flags);
2165                         } else {
2166                                 spin_unlock_irqrestore(&port->port_lock, flags);
2167                                 kfree(port);
2168                         }
2169
2170                 }
2171         }
2172 }
2173
2174 /* Circular Buffer */
2175
2176 /*
2177  * gs_buf_alloc
2178  *
2179  * Allocate a circular buffer and all associated memory.
2180  */
2181 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags)
2182 {
2183         struct gs_buf *gb;
2184
2185         if (size == 0)
2186                 return NULL;
2187
2188         gb = kmalloc(sizeof(struct gs_buf), kmalloc_flags);
2189         if (gb == NULL)
2190                 return NULL;
2191
2192         gb->buf_buf = kmalloc(size, kmalloc_flags);
2193         if (gb->buf_buf == NULL) {
2194                 kfree(gb);
2195                 return NULL;
2196         }
2197
2198         gb->buf_size = size;
2199         gb->buf_get = gb->buf_put = gb->buf_buf;
2200
2201         return gb;
2202 }
2203
2204 /*
2205  * gs_buf_free
2206  *
2207  * Free the buffer and all associated memory.
2208  */
2209 static void gs_buf_free(struct gs_buf *gb)
2210 {
2211         if (gb) {
2212                 kfree(gb->buf_buf);
2213                 kfree(gb);
2214         }
2215 }
2216
2217 /*
2218  * gs_buf_clear
2219  *
2220  * Clear out all data in the circular buffer.
2221  */
2222 static void gs_buf_clear(struct gs_buf *gb)
2223 {
2224         if (gb != NULL)
2225                 gb->buf_get = gb->buf_put;
2226                 /* equivalent to a get of all data available */
2227 }
2228
2229 /*
2230  * gs_buf_data_avail
2231  *
2232  * Return the number of bytes of data available in the circular
2233  * buffer.
2234  */
2235 static unsigned int gs_buf_data_avail(struct gs_buf *gb)
2236 {
2237         if (gb != NULL)
2238                 return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
2239         else
2240                 return 0;
2241 }
2242
2243 /*
2244  * gs_buf_space_avail
2245  *
2246  * Return the number of bytes of space available in the circular
2247  * buffer.
2248  */
2249 static unsigned int gs_buf_space_avail(struct gs_buf *gb)
2250 {
2251         if (gb != NULL)
2252                 return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
2253         else
2254                 return 0;
2255 }
2256
2257 /*
2258  * gs_buf_put
2259  *
2260  * Copy data data from a user buffer and put it into the circular buffer.
2261  * Restrict to the amount of space available.
2262  *
2263  * Return the number of bytes copied.
2264  */
2265 static unsigned int
2266 gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
2267 {
2268         unsigned int len;
2269
2270         if (gb == NULL)
2271                 return 0;
2272
2273         len  = gs_buf_space_avail(gb);
2274         if (count > len)
2275                 count = len;
2276
2277         if (count == 0)
2278                 return 0;
2279
2280         len = gb->buf_buf + gb->buf_size - gb->buf_put;
2281         if (count > len) {
2282                 memcpy(gb->buf_put, buf, len);
2283                 memcpy(gb->buf_buf, buf+len, count - len);
2284                 gb->buf_put = gb->buf_buf + count - len;
2285         } else {
2286                 memcpy(gb->buf_put, buf, count);
2287                 if (count < len)
2288                         gb->buf_put += count;
2289                 else /* count == len */
2290                         gb->buf_put = gb->buf_buf;
2291         }
2292
2293         return count;
2294 }
2295
2296 /*
2297  * gs_buf_get
2298  *
2299  * Get data from the circular buffer and copy to the given buffer.
2300  * Restrict to the amount of data available.
2301  *
2302  * Return the number of bytes copied.
2303  */
2304 static unsigned int
2305 gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
2306 {
2307         unsigned int len;
2308
2309         if (gb == NULL)
2310                 return 0;
2311
2312         len = gs_buf_data_avail(gb);
2313         if (count > len)
2314                 count = len;
2315
2316         if (count == 0)
2317                 return 0;
2318
2319         len = gb->buf_buf + gb->buf_size - gb->buf_get;
2320         if (count > len) {
2321                 memcpy(buf, gb->buf_get, len);
2322                 memcpy(buf+len, gb->buf_buf, count - len);
2323                 gb->buf_get = gb->buf_buf + count - len;
2324         } else {
2325                 memcpy(buf, gb->buf_get, count);
2326                 if (count < len)
2327                         gb->buf_get += count;
2328                 else /* count == len */
2329                         gb->buf_get = gb->buf_buf;
2330         }
2331
2332         return count;
2333 }