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/config.h>
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/delay.h>
  24 #include <linux/ioport.h>
  25 #include <linux/sched.h>
  26 #include <linux/slab.h>
  27 #include <linux/smp_lock.h>
  28 #include <linux/errno.h>
  29 #include <linux/init.h>
  30 #include <linux/timer.h>
  31 #include <linux/list.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/utsname.h>
  34 #include <linux/wait.h>
  35 #include <linux/proc_fs.h>
  36 #include <linux/device.h>
  37 #include <linux/tty.h>
  38 #include <linux/tty_flip.h>
  39
  40 #include <asm/byteorder.h>
  41 #include <asm/io.h>
  42 #include <asm/irq.h>
  43 #include <asm/system.h>
  44 #include <asm/unaligned.h>
  45 #include <asm/uaccess.h>
  46
  47 #include <linux/usb_ch9.h>
  48 #include <linux/usb/cdc.h>
  49 #include <linux/usb_gadget.h>
  50
  51 #include "gadget_chips.h"
  52
  53
  54 /* Defines */
  55
  56 #define GS_VERSION_STR                  "v2.2"
  57 #define GS_VERSION_NUM                  0x0202
  58
  59 #define GS_LONG_NAME                    "Gadget Serial"
  60 #define GS_SHORT_NAME                   "g_serial"
  61
  62 #define GS_MAJOR                        127
  63 #define GS_MINOR_START                  0
  64
  65 #define GS_NUM_PORTS                    16
  66
  67 #define GS_NUM_CONFIGS                  1
  68 #define GS_NO_CONFIG_ID                 0
  69 #define GS_BULK_CONFIG_ID               1
  70 #define GS_ACM_CONFIG_ID                2
  71
  72 #define GS_MAX_NUM_INTERFACES           2
  73 #define GS_BULK_INTERFACE_ID            0
  74 #define GS_CONTROL_INTERFACE_ID         0
  75 #define GS_DATA_INTERFACE_ID            1
  76
  77 #define GS_MAX_DESC_LEN                 256
  78
  79 #define GS_DEFAULT_READ_Q_SIZE          32
  80 #define GS_DEFAULT_WRITE_Q_SIZE         32
  81
  82 #define GS_DEFAULT_WRITE_BUF_SIZE       8192
  83 #define GS_TMP_BUF_SIZE                 8192
  84
  85 #define GS_CLOSE_TIMEOUT                15
  86
  87 #define GS_DEFAULT_USE_ACM              0
  88
  89 #define GS_DEFAULT_DTE_RATE             9600
  90 #define GS_DEFAULT_DATA_BITS            8
  91 #define GS_DEFAULT_PARITY               USB_CDC_NO_PARITY
  92 #define GS_DEFAULT_CHAR_FORMAT          USB_CDC_1_STOP_BITS
  93
  94 /* select highspeed/fullspeed, hiding highspeed if not configured */
  95 #ifdef CONFIG_USB_GADGET_DUALSPEED
  96 #define GS_SPEED_SELECT(is_hs,hs,fs) ((is_hs) ? (hs) : (fs))
  97 #else
  98 #define GS_SPEED_SELECT(is_hs,hs,fs) (fs)
  99 #endif /* CONFIG_USB_GADGET_DUALSPEED */
 100
 101 /* debug settings */
 102 #ifdef GS_DEBUG
 103 static int debug = 1;
 104
 105 #define gs_debug(format, arg...) \
 106         do { if (debug) printk(KERN_DEBUG format, ## arg); } while(0)
 107 #define gs_debug_level(level, format, arg...) \
 108         do { if (debug>=level) printk(KERN_DEBUG format, ## arg); } while(0)
 109
 110 #else
 111
 112 #define gs_debug(format, arg...) \
 113         do { } while(0)
 114 #define gs_debug_level(level, format, arg...) \
 115         do { } while(0)
 116
 117 #endif /* GS_DEBUG */
 118
 119 /* Thanks to NetChip Technologies for donating this product ID.
 120  *
 121  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 122  * Instead:  allocate your own, using normal USB-IF procedures.
 123  */
 124 #define GS_VENDOR_ID                    0x0525  /* NetChip */
 125 #define GS_PRODUCT_ID                   0xa4a6  /* Linux-USB Serial Gadget */
 126 #define GS_CDC_PRODUCT_ID               0xa4a7  /* ... as CDC-ACM */
 127
 128 #define GS_LOG2_NOTIFY_INTERVAL         5       /* 1 << 5 == 32 msec */
 129 #define GS_NOTIFY_MAXPACKET             8
 130
 131
 132 /* Structures */
 133
 134 struct gs_dev;
 135
 136 /* circular buffer */
 137 struct gs_buf {
 138         unsigned int            buf_size;
 139         char                    *buf_buf;
 140         char                    *buf_get;
 141         char                    *buf_put;
 142 };
 143
 144 /* list of requests */
 145 struct gs_req_entry {
 146         struct list_head        re_entry;
 147         struct usb_request      *re_req;
 148 };
 149
 150 /* the port structure holds info for each port, one for each minor number */
 151 struct gs_port {
 152         struct gs_dev           *port_dev;      /* pointer to device struct */
 153         struct tty_struct       *port_tty;      /* pointer to tty struct */
 154         spinlock_t              port_lock;
 155         int                     port_num;
 156         int                     port_open_count;
 157         int                     port_in_use;    /* open/close in progress */
 158         wait_queue_head_t       port_write_wait;/* waiting to write */
 159         struct gs_buf           *port_write_buf;
 160         struct usb_cdc_line_coding      port_line_coding;
 161 };
 162
 163 /* the device structure holds info for the USB device */
 164 struct gs_dev {
 165         struct usb_gadget       *dev_gadget;    /* gadget device pointer */
 166         spinlock_t              dev_lock;       /* lock for set/reset config */
 167         int                     dev_config;     /* configuration number */
 168         struct usb_ep           *dev_notify_ep; /* address of notify endpoint */
 169         struct usb_ep           *dev_in_ep;     /* address of in endpoint */
 170         struct usb_ep           *dev_out_ep;    /* address of out endpoint */
 171         struct usb_endpoint_descriptor          /* descriptor of notify ep */
 172                                 *dev_notify_ep_desc;
 173         struct usb_endpoint_descriptor          /* descriptor of in endpoint */
 174                                 *dev_in_ep_desc;
 175         struct usb_endpoint_descriptor          /* descriptor of out endpoint */
 176                                 *dev_out_ep_desc;
 177         struct usb_request      *dev_ctrl_req;  /* control request */
 178         struct list_head        dev_req_list;   /* list of write requests */
 179         int                     dev_sched_port; /* round robin port scheduled */
 180         struct gs_port          *dev_port[GS_NUM_PORTS]; /* the ports */
 181 };
 182
 183
 184 /* Functions */
 185
 186 /* module */
 187 static int __init gs_module_init(void);
 188 static void __exit gs_module_exit(void);
 189
 190 /* tty driver */
 191 static int gs_open(struct tty_struct *tty, struct file *file);
 192 static void gs_close(struct tty_struct *tty, struct file *file);
 193 static int gs_write(struct tty_struct *tty,
 194         const unsigned char *buf, int count);
 195 static void gs_put_char(struct tty_struct *tty, unsigned char ch);
 196 static void gs_flush_chars(struct tty_struct *tty);
 197 static int gs_write_room(struct tty_struct *tty);
 198 static int gs_chars_in_buffer(struct tty_struct *tty);
 199 static void gs_throttle(struct tty_struct * tty);
 200 static void gs_unthrottle(struct tty_struct * tty);
 201 static void gs_break(struct tty_struct *tty, int break_state);
 202 static int  gs_ioctl(struct tty_struct *tty, struct file *file,
 203         unsigned int cmd, unsigned long arg);
 204 static void gs_set_termios(struct tty_struct *tty, struct termios *old);
 205
 206 static int gs_send(struct gs_dev *dev);
 207 static int gs_send_packet(struct gs_dev *dev, char *packet,
 208         unsigned int size);
 209 static int gs_recv_packet(struct gs_dev *dev, char *packet,
 210         unsigned int size);
 211 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
 212 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
 213
 214 /* gadget driver */
 215 static int gs_bind(struct usb_gadget *gadget);
 216 static void gs_unbind(struct usb_gadget *gadget);
 217 static int gs_setup(struct usb_gadget *gadget,
 218         const struct usb_ctrlrequest *ctrl);
 219 static int gs_setup_standard(struct usb_gadget *gadget,
 220         const struct usb_ctrlrequest *ctrl);
 221 static int gs_setup_class(struct usb_gadget *gadget,
 222         const struct usb_ctrlrequest *ctrl);
 223 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
 224 static void gs_disconnect(struct usb_gadget *gadget);
 225 static int gs_set_config(struct gs_dev *dev, unsigned config);
 226 static void gs_reset_config(struct gs_dev *dev);
 227 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
 228                 u8 type, unsigned int index, int is_otg);
 229
 230 static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
 231         gfp_t kmalloc_flags);
 232 static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
 233
 234 static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
 235         gfp_t kmalloc_flags);
 236 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
 237
 238 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags);
 239 static void gs_free_ports(struct gs_dev *dev);
 240
 241 /* circular buffer */
 242 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags);
 243 static void gs_buf_free(struct gs_buf *gb);
 244 static void gs_buf_clear(struct gs_buf *gb);
 245 static unsigned int gs_buf_data_avail(struct gs_buf *gb);
 246 static unsigned int gs_buf_space_avail(struct gs_buf *gb);
 247 static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
 248         unsigned int count);
 249 static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
 250         unsigned int count);
 251
 252 /* external functions */
 253 extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
 254
 255
 256 /* Globals */
 257
 258 static struct gs_dev *gs_device;
 259
 260 static const char *EP_IN_NAME;
 261 static const char *EP_OUT_NAME;
 262 static const char *EP_NOTIFY_NAME;
 263
 264 static struct semaphore gs_open_close_sem[GS_NUM_PORTS];
 265
 266 static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
 267 static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
 268
 269 static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
 270
 271 static unsigned int use_acm = GS_DEFAULT_USE_ACM;
 272
 273
 274 /* tty driver struct */
 275 static struct tty_operations gs_tty_ops = {
 276         .open =                 gs_open,
 277         .close =                gs_close,
 278         .write =                gs_write,
 279         .put_char =             gs_put_char,
 280         .flush_chars =          gs_flush_chars,
 281         .write_room =           gs_write_room,
 282         .ioctl =                gs_ioctl,
 283         .set_termios =          gs_set_termios,
 284         .throttle =             gs_throttle,
 285         .unthrottle =           gs_unthrottle,
 286         .break_ctl =            gs_break,
 287         .chars_in_buffer =      gs_chars_in_buffer,
 288 };
 289 static struct tty_driver *gs_tty_driver;
 290
 291 /* gadget driver struct */
 292 static struct usb_gadget_driver gs_gadget_driver = {
 293 #ifdef CONFIG_USB_GADGET_DUALSPEED
 294         .speed =                USB_SPEED_HIGH,
 295 #else
 296         .speed =                USB_SPEED_FULL,
 297 #endif /* CONFIG_USB_GADGET_DUALSPEED */
 298         .function =             GS_LONG_NAME,
 299         .bind =                 gs_bind,
 300         .unbind =               __exit_p(gs_unbind),
 301         .setup =                gs_setup,
 302         .disconnect =           gs_disconnect,
 303         .driver = {
 304                 .name =         GS_SHORT_NAME,
 305         },
 306 };
 307
 308
 309 /* USB descriptors */
 310
 311 #define GS_MANUFACTURER_STR_ID  1
 312 #define GS_PRODUCT_STR_ID       2
 313 #define GS_SERIAL_STR_ID        3
 314 #define GS_BULK_CONFIG_STR_ID   4
 315 #define GS_ACM_CONFIG_STR_ID    5
 316 #define GS_CONTROL_STR_ID       6
 317 #define GS_DATA_STR_ID          7
 318
 319 /* static strings, in UTF-8 */
 320 static char manufacturer[50];
 321 static struct usb_string gs_strings[] = {
 322         { GS_MANUFACTURER_STR_ID, manufacturer },
 323         { GS_PRODUCT_STR_ID, GS_LONG_NAME },
 324         { GS_SERIAL_STR_ID, "0" },
 325         { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
 326         { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
 327         { GS_CONTROL_STR_ID, "Gadget Serial Control" },
 328         { GS_DATA_STR_ID, "Gadget Serial Data" },
 329         {  } /* end of list */
 330 };
 331
 332 static struct usb_gadget_strings gs_string_table = {
 333         .language =             0x0409, /* en-us */
 334         .strings =              gs_strings,
 335 };
 336
 337 static struct usb_device_descriptor gs_device_desc = {
 338         .bLength =              USB_DT_DEVICE_SIZE,
 339         .bDescriptorType =      USB_DT_DEVICE,
 340         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 341         .bDeviceSubClass =      0,
 342         .bDeviceProtocol =      0,
 343         .idVendor =             __constant_cpu_to_le16(GS_VENDOR_ID),
 344         .idProduct =            __constant_cpu_to_le16(GS_PRODUCT_ID),
 345         .iManufacturer =        GS_MANUFACTURER_STR_ID,
 346         .iProduct =             GS_PRODUCT_STR_ID,
 347         .iSerialNumber =        GS_SERIAL_STR_ID,
 348         .bNumConfigurations =   GS_NUM_CONFIGS,
 349 };
 350
 351 static struct usb_otg_descriptor gs_otg_descriptor = {
 352         .bLength =              sizeof(gs_otg_descriptor),
 353         .bDescriptorType =      USB_DT_OTG,
 354         .bmAttributes =         USB_OTG_SRP,
 355 };
 356
 357 static struct usb_config_descriptor gs_bulk_config_desc = {
 358         .bLength =              USB_DT_CONFIG_SIZE,
 359         .bDescriptorType =      USB_DT_CONFIG,
 360         /* .wTotalLength computed dynamically */
 361         .bNumInterfaces =       1,
 362         .bConfigurationValue =  GS_BULK_CONFIG_ID,
 363         .iConfiguration =       GS_BULK_CONFIG_STR_ID,
 364         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 365         .bMaxPower =            1,
 366 };
 367
 368 static struct usb_config_descriptor gs_acm_config_desc = {
 369         .bLength =              USB_DT_CONFIG_SIZE,
 370         .bDescriptorType =      USB_DT_CONFIG,
 371         /* .wTotalLength computed dynamically */
 372         .bNumInterfaces =       2,
 373         .bConfigurationValue =  GS_ACM_CONFIG_ID,
 374         .iConfiguration =       GS_ACM_CONFIG_STR_ID,
 375         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 376         .bMaxPower =            1,
 377 };
 378
 379 static const struct usb_interface_descriptor gs_bulk_interface_desc = {
 380         .bLength =              USB_DT_INTERFACE_SIZE,
 381         .bDescriptorType =      USB_DT_INTERFACE,
 382         .bInterfaceNumber =     GS_BULK_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_interface_descriptor gs_control_interface_desc = {
 391         .bLength =              USB_DT_INTERFACE_SIZE,
 392         .bDescriptorType =      USB_DT_INTERFACE,
 393         .bInterfaceNumber =     GS_CONTROL_INTERFACE_ID,
 394         .bNumEndpoints =        1,
 395         .bInterfaceClass =      USB_CLASS_COMM,
 396         .bInterfaceSubClass =   USB_CDC_SUBCLASS_ACM,
 397         .bInterfaceProtocol =   USB_CDC_ACM_PROTO_AT_V25TER,
 398         .iInterface =           GS_CONTROL_STR_ID,
 399 };
 400
 401 static const struct usb_interface_descriptor gs_data_interface_desc = {
 402         .bLength =              USB_DT_INTERFACE_SIZE,
 403         .bDescriptorType =      USB_DT_INTERFACE,
 404         .bInterfaceNumber =     GS_DATA_INTERFACE_ID,
 405         .bNumEndpoints =        2,
 406         .bInterfaceClass =      USB_CLASS_CDC_DATA,
 407         .bInterfaceSubClass =   0,
 408         .bInterfaceProtocol =   0,
 409         .iInterface =           GS_DATA_STR_ID,
 410 };
 411
 412 static const struct usb_cdc_header_desc gs_header_desc = {
 413         .bLength =              sizeof(gs_header_desc),
 414         .bDescriptorType =      USB_DT_CS_INTERFACE,
 415         .bDescriptorSubType =   USB_CDC_HEADER_TYPE,
 416         .bcdCDC =               __constant_cpu_to_le16(0x0110),
 417 };
 418
 419 static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
 420         .bLength =              sizeof(gs_call_mgmt_descriptor),
 421         .bDescriptorType =      USB_DT_CS_INTERFACE,
 422         .bDescriptorSubType =   USB_CDC_CALL_MANAGEMENT_TYPE,
 423         .bmCapabilities =       0,
 424         .bDataInterface =       1,      /* index of data interface */
 425 };
 426
 427 static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
 428         .bLength =              sizeof(gs_acm_descriptor),
 429         .bDescriptorType =      USB_DT_CS_INTERFACE,
 430         .bDescriptorSubType =   USB_CDC_ACM_TYPE,
 431         .bmCapabilities =       0,
 432 };
 433
 434 static const struct usb_cdc_union_desc gs_union_desc = {
 435         .bLength =              sizeof(gs_union_desc),
 436         .bDescriptorType =      USB_DT_CS_INTERFACE,
 437         .bDescriptorSubType =   USB_CDC_UNION_TYPE,
 438         .bMasterInterface0 =    0,      /* index of control interface */
 439         .bSlaveInterface0 =     1,      /* index of data interface */
 440 };
 441
 442 static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = {
 443         .bLength =              USB_DT_ENDPOINT_SIZE,
 444         .bDescriptorType =      USB_DT_ENDPOINT,
 445         .bEndpointAddress =     USB_DIR_IN,
 446         .bmAttributes =         USB_ENDPOINT_XFER_INT,
 447         .wMaxPacketSize =       __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
 448         .bInterval =            1 << GS_LOG2_NOTIFY_INTERVAL,
 449 };
 450
 451 static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
 452         .bLength =              USB_DT_ENDPOINT_SIZE,
 453         .bDescriptorType =      USB_DT_ENDPOINT,
 454         .bEndpointAddress =     USB_DIR_IN,
 455         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 456 };
 457
 458 static struct usb_endpoint_descriptor gs_fullspeed_out_desc = {
 459         .bLength =              USB_DT_ENDPOINT_SIZE,
 460         .bDescriptorType =      USB_DT_ENDPOINT,
 461         .bEndpointAddress =     USB_DIR_OUT,
 462         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 463 };
 464
 465 static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = {
 466         (struct usb_descriptor_header *) &gs_otg_descriptor,
 467         (struct usb_descriptor_header *) &gs_bulk_interface_desc,
 468         (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
 469         (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
 470         NULL,
 471 };
 472
 473 static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = {
 474         (struct usb_descriptor_header *) &gs_otg_descriptor,
 475         (struct usb_descriptor_header *) &gs_control_interface_desc,
 476         (struct usb_descriptor_header *) &gs_header_desc,
 477         (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
 478         (struct usb_descriptor_header *) &gs_acm_descriptor,
 479         (struct usb_descriptor_header *) &gs_union_desc,
 480         (struct usb_descriptor_header *) &gs_fullspeed_notify_desc,
 481         (struct usb_descriptor_header *) &gs_data_interface_desc,
 482         (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
 483         (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
 484         NULL,
 485 };
 486
 487 #ifdef CONFIG_USB_GADGET_DUALSPEED
 488 static struct usb_endpoint_descriptor gs_highspeed_notify_desc = {
 489         .bLength =              USB_DT_ENDPOINT_SIZE,
 490         .bDescriptorType =      USB_DT_ENDPOINT,
 491         .bEndpointAddress =     USB_DIR_IN,
 492         .bmAttributes =         USB_ENDPOINT_XFER_INT,
 493         .wMaxPacketSize =       __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
 494         .bInterval =            GS_LOG2_NOTIFY_INTERVAL+4,
 495 };
 496
 497 static struct usb_endpoint_descriptor gs_highspeed_in_desc = {
 498         .bLength =              USB_DT_ENDPOINT_SIZE,
 499         .bDescriptorType =      USB_DT_ENDPOINT,
 500         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 501         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 502 };
 503
 504 static struct usb_endpoint_descriptor gs_highspeed_out_desc = {
 505         .bLength =              USB_DT_ENDPOINT_SIZE,
 506         .bDescriptorType =      USB_DT_ENDPOINT,
 507         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 508         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 509 };
 510
 511 static struct usb_qualifier_descriptor gs_qualifier_desc = {
 512         .bLength =              sizeof(struct usb_qualifier_descriptor),
 513         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
 514         .bcdUSB =               __constant_cpu_to_le16 (0x0200),
 515         /* assumes ep0 uses the same value for both speeds ... */
 516         .bNumConfigurations =   GS_NUM_CONFIGS,
 517 };
 518
 519 static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = {
 520         (struct usb_descriptor_header *) &gs_otg_descriptor,
 521         (struct usb_descriptor_header *) &gs_bulk_interface_desc,
 522         (struct usb_descriptor_header *) &gs_highspeed_in_desc,
 523         (struct usb_descriptor_header *) &gs_highspeed_out_desc,
 524         NULL,
 525 };
 526
 527 static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
 528         (struct usb_descriptor_header *) &gs_otg_descriptor,
 529         (struct usb_descriptor_header *) &gs_control_interface_desc,
 530         (struct usb_descriptor_header *) &gs_header_desc,
 531         (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
 532         (struct usb_descriptor_header *) &gs_acm_descriptor,
 533         (struct usb_descriptor_header *) &gs_union_desc,
 534         (struct usb_descriptor_header *) &gs_highspeed_notify_desc,
 535         (struct usb_descriptor_header *) &gs_data_interface_desc,
 536         (struct usb_descriptor_header *) &gs_highspeed_in_desc,
 537         (struct usb_descriptor_header *) &gs_highspeed_out_desc,
 538         NULL,
 539 };
 540
 541 #endif /* CONFIG_USB_GADGET_DUALSPEED */
 542
 543
 544 /* Module */
 545 MODULE_DESCRIPTION(GS_LONG_NAME);
 546 MODULE_AUTHOR("Al Borchers");
 547 MODULE_LICENSE("GPL");
 548
 549 #ifdef GS_DEBUG
 550 module_param(debug, int, S_IRUGO|S_IWUSR);
 551 MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
 552 #endif
 553
 554 module_param(read_q_size, uint, S_IRUGO);
 555 MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
 556
 557 module_param(write_q_size, uint, S_IRUGO);
 558 MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
 559
 560 module_param(write_buf_size, uint, S_IRUGO);
 561 MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
 562
 563 module_param(use_acm, uint, S_IRUGO);
 564 MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
 565
 566 module_init(gs_module_init);
 567 module_exit(gs_module_exit);
 568
 569 /*
 570 *  gs_module_init
 571 *
 572 *  Register as a USB gadget driver and a tty driver.
 573 */
 574 static int __init gs_module_init(void)
 575 {
 576         int i;
 577         int retval;
 578
 579         retval = usb_gadget_register_driver(&gs_gadget_driver);
 580         if (retval) {
 581                 printk(KERN_ERR "gs_module_init: cannot register gadget driver, ret=%d\n", retval);
 582                 return retval;
 583         }
 584
 585         gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
 586         if (!gs_tty_driver)
 587                 return -ENOMEM;
 588         gs_tty_driver->owner = THIS_MODULE;
 589         gs_tty_driver->driver_name = GS_SHORT_NAME;
 590         gs_tty_driver->name = "ttygs";
 591         gs_tty_driver->devfs_name = "usb/ttygs/";
 592         gs_tty_driver->major = GS_MAJOR;
 593         gs_tty_driver->minor_start = GS_MINOR_START;
 594         gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
 595         gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
 596         gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
 597         gs_tty_driver->init_termios = tty_std_termios;
 598         gs_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 599         tty_set_operations(gs_tty_driver, &gs_tty_ops);
 600
 601         for (i=0; i < GS_NUM_PORTS; i++)
 602                 sema_init(&gs_open_close_sem[i], 1);
 603
 604         retval = tty_register_driver(gs_tty_driver);
 605         if (retval) {
 606                 usb_gadget_unregister_driver(&gs_gadget_driver);
 607                 put_tty_driver(gs_tty_driver);
 608                 printk(KERN_ERR "gs_module_init: cannot register tty driver, ret=%d\n", retval);
 609                 return retval;
 610         }
 611
 612         printk(KERN_INFO "gs_module_init: %s %s loaded\n", GS_LONG_NAME, GS_VERSION_STR);
 613         return 0;
 614 }
 615
 616 /*
 617 * gs_module_exit
 618 *
 619 * Unregister as a tty driver and a USB gadget driver.
 620 */
 621 static void __exit gs_module_exit(void)
 622 {
 623         tty_unregister_driver(gs_tty_driver);
 624         put_tty_driver(gs_tty_driver);
 625         usb_gadget_unregister_driver(&gs_gadget_driver);
 626
 627         printk(KERN_INFO "gs_module_exit: %s %s unloaded\n", GS_LONG_NAME, GS_VERSION_STR);
 628 }
 629
 630 /* TTY Driver */
 631
 632 /*
 633  * gs_open
 634  */
 635 static int gs_open(struct tty_struct *tty, struct file *file)
 636 {
 637         int port_num;
 638         unsigned long flags;
 639         struct gs_port *port;
 640         struct gs_dev *dev;
 641         struct gs_buf *buf;
 642         struct semaphore *sem;
 643         int ret;
 644
 645         port_num = tty->index;
 646
 647         gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
 648
 649         if (port_num < 0 || port_num >= GS_NUM_PORTS) {
 650                 printk(KERN_ERR "gs_open: (%d,%p,%p) invalid port number\n",
 651                         port_num, tty, file);
 652                 return -ENODEV;
 653         }
 654
 655         dev = gs_device;
 656
 657         if (dev == NULL) {
 658                 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL device pointer\n",
 659                         port_num, tty, file);
 660                 return -ENODEV;
 661         }
 662
 663         sem = &gs_open_close_sem[port_num];
 664         if (down_interruptible(sem)) {
 665                 printk(KERN_ERR
 666                 "gs_open: (%d,%p,%p) interrupted waiting for semaphore\n",
 667                         port_num, tty, file);
 668                 return -ERESTARTSYS;
 669         }
 670
 671         spin_lock_irqsave(&dev->dev_lock, flags);
 672
 673         if (dev->dev_config == GS_NO_CONFIG_ID) {
 674                 printk(KERN_ERR
 675                         "gs_open: (%d,%p,%p) device is not connected\n",
 676                         port_num, tty, file);
 677                 ret = -ENODEV;
 678                 goto exit_unlock_dev;
 679         }
 680
 681         port = dev->dev_port[port_num];
 682
 683         if (port == NULL) {
 684                 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL port pointer\n",
 685                         port_num, tty, file);
 686                 ret = -ENODEV;
 687                 goto exit_unlock_dev;
 688         }
 689
 690         spin_lock(&port->port_lock);
 691         spin_unlock(&dev->dev_lock);
 692
 693         if (port->port_dev == NULL) {
 694                 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (1)\n",
 695                         port_num, tty, file);
 696                 ret = -EIO;
 697                 goto exit_unlock_port;
 698         }
 699
 700         if (port->port_open_count > 0) {
 701                 ++port->port_open_count;
 702                 gs_debug("gs_open: (%d,%p,%p) already open\n",
 703                         port_num, tty, file);
 704                 ret = 0;
 705                 goto exit_unlock_port;
 706         }
 707
 708         tty->driver_data = NULL;
 709
 710         /* mark port as in use, we can drop port lock and sleep if necessary */
 711         port->port_in_use = 1;
 712
 713         /* allocate write buffer on first open */
 714         if (port->port_write_buf == NULL) {
 715                 spin_unlock_irqrestore(&port->port_lock, flags);
 716                 buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
 717                 spin_lock_irqsave(&port->port_lock, flags);
 718
 719                 /* might have been disconnected while asleep, check */
 720                 if (port->port_dev == NULL) {
 721                         printk(KERN_ERR
 722                                 "gs_open: (%d,%p,%p) port disconnected (2)\n",
 723                                 port_num, tty, file);
 724                         port->port_in_use = 0;
 725                         ret = -EIO;
 726                         goto exit_unlock_port;
 727                 }
 728
 729                 if ((port->port_write_buf=buf) == NULL) {
 730                         printk(KERN_ERR "gs_open: (%d,%p,%p) cannot allocate port write buffer\n",
 731                                 port_num, tty, file);
 732                         port->port_in_use = 0;
 733                         ret = -ENOMEM;
 734                         goto exit_unlock_port;
 735                 }
 736
 737         }
 738
 739         /* wait for carrier detect (not implemented) */
 740
 741         /* might have been disconnected while asleep, check */
 742         if (port->port_dev == NULL) {
 743                 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (3)\n",
 744                         port_num, tty, file);
 745                 port->port_in_use = 0;
 746                 ret = -EIO;
 747                 goto exit_unlock_port;
 748         }
 749
 750         tty->driver_data = port;
 751         port->port_tty = tty;
 752         port->port_open_count = 1;
 753         port->port_in_use = 0;
 754
 755         gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
 756
 757         ret = 0;
 758
 759 exit_unlock_port:
 760         spin_unlock_irqrestore(&port->port_lock, flags);
 761         up(sem);
 762         return ret;
 763
 764 exit_unlock_dev:
 765         spin_unlock_irqrestore(&dev->dev_lock, flags);
 766         up(sem);
 767         return ret;
 768
 769 }
 770
 771 /*
 772  * gs_close
 773  */
 774
 775 #define GS_WRITE_FINISHED_EVENT_SAFELY(p)                       \
 776 ({                                                              \
 777         int cond;                                               \
 778                                                                 \
 779         spin_lock_irq(&(p)->port_lock);                         \
 780         cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf); \
 781         spin_unlock_irq(&(p)->port_lock);                       \
 782         cond;                                                   \
 783 })
 784
 785 static void gs_close(struct tty_struct *tty, struct file *file)
 786 {
 787         struct gs_port *port = tty->driver_data;
 788         struct semaphore *sem;
 789
 790         if (port == NULL) {
 791                 printk(KERN_ERR "gs_close: NULL port pointer\n");
 792                 return;
 793         }
 794
 795         gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
 796
 797         sem = &gs_open_close_sem[port->port_num];
 798         down(sem);
 799
 800         spin_lock_irq(&port->port_lock);
 801
 802         if (port->port_open_count == 0) {
 803                 printk(KERN_ERR
 804                         "gs_close: (%d,%p,%p) port is already closed\n",
 805                         port->port_num, tty, file);
 806                 goto exit;
 807         }
 808
 809         if (port->port_open_count > 1) {
 810                 --port->port_open_count;
 811                 goto exit;
 812         }
 813
 814         /* free disconnected port on final close */
 815         if (port->port_dev == NULL) {
 816                 kfree(port);
 817                 goto exit;
 818         }
 819
 820         /* mark port as closed but in use, we can drop port lock */
 821         /* and sleep if necessary */
 822         port->port_in_use = 1;
 823         port->port_open_count = 0;
 824
 825         /* wait for write buffer to drain, or */
 826         /* at most GS_CLOSE_TIMEOUT seconds */
 827         if (gs_buf_data_avail(port->port_write_buf) > 0) {
 828                 spin_unlock_irq(&port->port_lock);
 829                 wait_event_interruptible_timeout(port->port_write_wait,
 830                                         GS_WRITE_FINISHED_EVENT_SAFELY(port),
 831                                         GS_CLOSE_TIMEOUT * HZ);
 832                 spin_lock_irq(&port->port_lock);
 833         }
 834
 835         /* free disconnected port on final close */
 836         /* (might have happened during the above sleep) */
 837         if (port->port_dev == NULL) {
 838                 kfree(port);
 839                 goto exit;
 840         }
 841
 842         gs_buf_clear(port->port_write_buf);
 843
 844         tty->driver_data = NULL;
 845         port->port_tty = NULL;
 846         port->port_in_use = 0;
 847
 848         gs_debug("gs_close: (%d,%p,%p) completed\n",
 849                 port->port_num, tty, file);
 850
 851 exit:
 852         spin_unlock_irq(&port->port_lock);
 853         up(sem);
 854 }
 855
 856 /*
 857  * gs_write
 858  */
 859 static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
 860 {
 861         unsigned long flags;
 862         struct gs_port *port = tty->driver_data;
 863         int ret;
 864
 865         if (port == NULL) {
 866                 printk(KERN_ERR "gs_write: NULL port pointer\n");
 867                 return -EIO;
 868         }
 869
 870         gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
 871                 count);
 872
 873         if (count == 0)
 874                 return 0;
 875
 876         spin_lock_irqsave(&port->port_lock, flags);
 877
 878         if (port->port_dev == NULL) {
 879                 printk(KERN_ERR "gs_write: (%d,%p) port is not connected\n",
 880                         port->port_num, tty);
 881                 ret = -EIO;
 882                 goto exit;
 883         }
 884
 885         if (port->port_open_count == 0) {
 886                 printk(KERN_ERR "gs_write: (%d,%p) port is closed\n",
 887                         port->port_num, tty);
 888                 ret = -EBADF;
 889                 goto exit;
 890         }
 891
 892         count = gs_buf_put(port->port_write_buf, buf, count);
 893
 894         spin_unlock_irqrestore(&port->port_lock, flags);
 895
 896         gs_send(gs_device);
 897
 898         gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
 899                 count);
 900
 901         return count;
 902
 903 exit:
 904         spin_unlock_irqrestore(&port->port_lock, flags);
 905         return ret;
 906 }
 907
 908 /*
 909  * gs_put_char
 910  */
 911 static void gs_put_char(struct tty_struct *tty, unsigned char ch)
 912 {
 913         unsigned long flags;
 914         struct gs_port *port = tty->driver_data;
 915
 916         if (port == NULL) {
 917                 printk(KERN_ERR "gs_put_char: NULL port pointer\n");
 918                 return;
 919         }
 920
 921         gs_debug("gs_put_char: (%d,%p) char=0x%x, called from %p, %p, %p\n", port->port_num, tty, ch, __builtin_return_address(0), __builtin_return_address(1), __builtin_return_address(2));
 922
 923         spin_lock_irqsave(&port->port_lock, flags);
 924
 925         if (port->port_dev == NULL) {
 926                 printk(KERN_ERR "gs_put_char: (%d,%p) port is not connected\n",
 927                         port->port_num, tty);
 928                 goto exit;
 929         }
 930
 931         if (port->port_open_count == 0) {
 932                 printk(KERN_ERR "gs_put_char: (%d,%p) port is closed\n",
 933                         port->port_num, tty);
 934                 goto exit;
 935         }
 936
 937         gs_buf_put(port->port_write_buf, &ch, 1);
 938
 939 exit:
 940         spin_unlock_irqrestore(&port->port_lock, flags);
 941 }
 942
 943 /*
 944  * gs_flush_chars
 945  */
 946 static void gs_flush_chars(struct tty_struct *tty)
 947 {
 948         unsigned long flags;
 949         struct gs_port *port = tty->driver_data;
 950
 951         if (port == NULL) {
 952                 printk(KERN_ERR "gs_flush_chars: NULL port pointer\n");
 953                 return;
 954         }
 955
 956         gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
 957
 958         spin_lock_irqsave(&port->port_lock, flags);
 959
 960         if (port->port_dev == NULL) {
 961                 printk(KERN_ERR
 962                         "gs_flush_chars: (%d,%p) port is not connected\n",
 963                         port->port_num, tty);
 964                 goto exit;
 965         }
 966
 967         if (port->port_open_count == 0) {
 968                 printk(KERN_ERR "gs_flush_chars: (%d,%p) port is closed\n",
 969                         port->port_num, tty);
 970                 goto exit;
 971         }
 972
 973         spin_unlock_irqrestore(&port->port_lock, flags);
 974
 975         gs_send(gs_device);
 976
 977         return;
 978
 979 exit:
 980         spin_unlock_irqrestore(&port->port_lock, flags);
 981 }
 982
 983 /*
 984  * gs_write_room
 985  */
 986 static int gs_write_room(struct tty_struct *tty)
 987 {
 988
 989         int room = 0;
 990         unsigned long flags;
 991         struct gs_port *port = tty->driver_data;
 992
 993
 994         if (port == NULL)
 995                 return 0;
 996
 997         spin_lock_irqsave(&port->port_lock, flags);
 998
 999         if (port->port_dev != NULL && port->port_open_count > 0
1000         && port->port_write_buf != NULL)
1001                 room = gs_buf_space_avail(port->port_write_buf);
1002
1003         spin_unlock_irqrestore(&port->port_lock, flags);
1004
1005         gs_debug("gs_write_room: (%d,%p) room=%d\n",
1006                 port->port_num, tty, room);
1007
1008         return room;
1009 }
1010
1011 /*
1012  * gs_chars_in_buffer
1013  */
1014 static int gs_chars_in_buffer(struct tty_struct *tty)
1015 {
1016         int chars = 0;
1017         unsigned long flags;
1018         struct gs_port *port = tty->driver_data;
1019
1020         if (port == NULL)
1021                 return 0;
1022
1023         spin_lock_irqsave(&port->port_lock, flags);
1024
1025         if (port->port_dev != NULL && port->port_open_count > 0
1026         && port->port_write_buf != NULL)
1027                 chars = gs_buf_data_avail(port->port_write_buf);
1028
1029         spin_unlock_irqrestore(&port->port_lock, flags);
1030
1031         gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
1032                 port->port_num, tty, chars);
1033
1034         return chars;
1035 }
1036
1037 /*
1038  * gs_throttle
1039  */
1040 static void gs_throttle(struct tty_struct *tty)
1041 {
1042 }
1043
1044 /*
1045  * gs_unthrottle
1046  */
1047 static void gs_unthrottle(struct tty_struct *tty)
1048 {
1049 }
1050
1051 /*
1052  * gs_break
1053  */
1054 static void gs_break(struct tty_struct *tty, int break_state)
1055 {
1056 }
1057
1058 /*
1059  * gs_ioctl
1060  */
1061 static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1062 {
1063         struct gs_port *port = tty->driver_data;
1064
1065         if (port == NULL) {
1066                 printk(KERN_ERR "gs_ioctl: NULL port pointer\n");
1067                 return -EIO;
1068         }
1069
1070         gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
1071                 port->port_num, tty, file, cmd, arg);
1072
1073         /* handle ioctls */
1074
1075         /* could not handle ioctl */
1076         return -ENOIOCTLCMD;
1077 }
1078
1079 /*
1080  * gs_set_termios
1081  */
1082 static void gs_set_termios(struct tty_struct *tty, struct termios *old)
1083 {
1084 }
1085
1086 /*
1087 * gs_send
1088 *
1089 * This function finds available write requests, calls
1090 * gs_send_packet to fill these packets with data, and
1091 * continues until either there are no more write requests
1092 * available or no more data to send.  This function is
1093 * run whenever data arrives or write requests are available.
1094 */
1095 static int gs_send(struct gs_dev *dev)
1096 {
1097         int ret,len;
1098         unsigned long flags;
1099         struct usb_ep *ep;
1100         struct usb_request *req;
1101         struct gs_req_entry *req_entry;
1102
1103         if (dev == NULL) {
1104                 printk(KERN_ERR "gs_send: NULL device pointer\n");
1105                 return -ENODEV;
1106         }
1107
1108         spin_lock_irqsave(&dev->dev_lock, flags);
1109
1110         ep = dev->dev_in_ep;
1111
1112         while(!list_empty(&dev->dev_req_list)) {
1113
1114                 req_entry = list_entry(dev->dev_req_list.next,
1115                         struct gs_req_entry, re_entry);
1116
1117                 req = req_entry->re_req;
1118
1119                 len = gs_send_packet(dev, req->buf, ep->maxpacket);
1120
1121                 if (len > 0) {
1122 gs_debug_level(3, "gs_send: len=%d, 0x%2.2x 0x%2.2x 0x%2.2x ...\n", len, *((unsigned char *)req->buf), *((unsigned char *)req->buf+1), *((unsigned char *)req->buf+2));
1123                         list_del(&req_entry->re_entry);
1124                         req->length = len;
1125                         if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1126                                 printk(KERN_ERR
1127                                 "gs_send: cannot queue read request, ret=%d\n",
1128                                         ret);
1129                                 break;
1130                         }
1131                 } else {
1132                         break;
1133                 }
1134
1135         }
1136
1137         spin_unlock_irqrestore(&dev->dev_lock, flags);
1138
1139         return 0;
1140 }
1141
1142 /*
1143  * gs_send_packet
1144  *
1145  * If there is data to send, a packet is built in the given
1146  * buffer and the size is returned.  If there is no data to
1147  * send, 0 is returned.  If there is any error a negative
1148  * error number is returned.
1149  *
1150  * Called during USB completion routine, on interrupt time.
1151  *
1152  * We assume that disconnect will not happen until all completion
1153  * routines have completed, so we can assume that the dev_port
1154  * array does not change during the lifetime of this function.
1155  */
1156 static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
1157 {
1158         unsigned int len;
1159         struct gs_port *port;
1160
1161         /* TEMPORARY -- only port 0 is supported right now */
1162         port = dev->dev_port[0];
1163
1164         if (port == NULL) {
1165                 printk(KERN_ERR
1166                         "gs_send_packet: port=%d, NULL port pointer\n",
1167                         0);
1168                 return -EIO;
1169         }
1170
1171         spin_lock(&port->port_lock);
1172
1173         len = gs_buf_data_avail(port->port_write_buf);
1174         if (len < size)
1175                 size = len;
1176
1177         if (size == 0)
1178                 goto exit;
1179
1180         size = gs_buf_get(port->port_write_buf, packet, size);
1181
1182         if (port->port_tty)
1183                 wake_up_interruptible(&port->port_tty->write_wait);
1184
1185 exit:
1186         spin_unlock(&port->port_lock);
1187         return size;
1188 }
1189
1190 /*
1191  * gs_recv_packet
1192  *
1193  * Called for each USB packet received.  Reads the packet
1194  * header and stuffs the data in the appropriate tty buffer.
1195  * Returns 0 if successful, or a negative error number.
1196  *
1197  * Called during USB completion routine, on interrupt time.
1198  *
1199  * We assume that disconnect will not happen until all completion
1200  * routines have completed, so we can assume that the dev_port
1201  * array does not change during the lifetime of this function.
1202  */
1203 static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
1204 {
1205         unsigned int len;
1206         struct gs_port *port;
1207         int ret;
1208         struct tty_struct *tty;
1209
1210         /* TEMPORARY -- only port 0 is supported right now */
1211         port = dev->dev_port[0];
1212
1213         if (port == NULL) {
1214                 printk(KERN_ERR "gs_recv_packet: port=%d, NULL port pointer\n",
1215                         port->port_num);
1216                 return -EIO;
1217         }
1218
1219         spin_lock(&port->port_lock);
1220
1221         if (port->port_open_count == 0) {
1222                 printk(KERN_ERR "gs_recv_packet: port=%d, port is closed\n",
1223                         port->port_num);
1224                 ret = -EIO;
1225                 goto exit;
1226         }
1227
1228
1229         tty = port->port_tty;
1230
1231         if (tty == NULL) {
1232                 printk(KERN_ERR "gs_recv_packet: port=%d, NULL tty pointer\n",
1233                         port->port_num);
1234                 ret = -EIO;
1235                 goto exit;
1236         }
1237
1238         if (port->port_tty->magic != TTY_MAGIC) {
1239                 printk(KERN_ERR "gs_recv_packet: port=%d, bad tty magic\n",
1240                         port->port_num);
1241                 ret = -EIO;
1242                 goto exit;
1243         }
1244
1245         len = tty_buffer_request_room(tty, size);
1246         if (len > 0) {
1247                 tty_insert_flip_string(tty, packet, len);
1248                 tty_flip_buffer_push(port->port_tty);
1249                 wake_up_interruptible(&port->port_tty->read_wait);
1250         }
1251         ret = 0;
1252 exit:
1253         spin_unlock(&port->port_lock);
1254         return ret;
1255 }
1256
1257 /*
1258 * gs_read_complete
1259 */
1260 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
1261 {
1262         int ret;
1263         struct gs_dev *dev = ep->driver_data;
1264
1265         if (dev == NULL) {
1266                 printk(KERN_ERR "gs_read_complete: NULL device pointer\n");
1267                 return;
1268         }
1269
1270         switch(req->status) {
1271         case 0:
1272                 /* normal completion */
1273                 gs_recv_packet(dev, req->buf, req->actual);
1274 requeue:
1275                 req->length = ep->maxpacket;
1276                 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1277                         printk(KERN_ERR
1278                         "gs_read_complete: cannot queue read request, ret=%d\n",
1279                                 ret);
1280                 }
1281                 break;
1282
1283         case -ESHUTDOWN:
1284                 /* disconnect */
1285                 gs_debug("gs_read_complete: shutdown\n");
1286                 gs_free_req(ep, req);
1287                 break;
1288
1289         default:
1290                 /* unexpected */
1291                 printk(KERN_ERR
1292                 "gs_read_complete: unexpected status error, status=%d\n",
1293                         req->status);
1294                 goto requeue;
1295                 break;
1296         }
1297 }
1298
1299 /*
1300 * gs_write_complete
1301 */
1302 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
1303 {
1304         struct gs_dev *dev = ep->driver_data;
1305         struct gs_req_entry *gs_req = req->context;
1306
1307         if (dev == NULL) {
1308                 printk(KERN_ERR "gs_write_complete: NULL device pointer\n");
1309                 return;
1310         }
1311
1312         switch(req->status) {
1313         case 0:
1314                 /* normal completion */
1315 requeue:
1316                 if (gs_req == NULL) {
1317                         printk(KERN_ERR
1318                                 "gs_write_complete: NULL request pointer\n");
1319                         return;
1320                 }
1321
1322                 spin_lock(&dev->dev_lock);
1323                 list_add(&gs_req->re_entry, &dev->dev_req_list);
1324                 spin_unlock(&dev->dev_lock);
1325
1326                 gs_send(dev);
1327
1328                 break;
1329
1330         case -ESHUTDOWN:
1331                 /* disconnect */
1332                 gs_debug("gs_write_complete: shutdown\n");
1333                 gs_free_req(ep, req);
1334                 break;
1335
1336         default:
1337                 printk(KERN_ERR
1338                 "gs_write_complete: unexpected status error, status=%d\n",
1339                         req->status);
1340                 goto requeue;
1341                 break;
1342         }
1343 }
1344
1345 /* Gadget Driver */
1346
1347 /*
1348  * gs_bind
1349  *
1350  * Called on module load.  Allocates and initializes the device
1351  * structure and a control request.
1352  */
1353 static int __init gs_bind(struct usb_gadget *gadget)
1354 {
1355         int ret;
1356         struct usb_ep *ep;
1357         struct gs_dev *dev;
1358         int gcnum;
1359
1360         /* Some controllers can't support CDC ACM:
1361          * - sh doesn't support multiple interfaces or configs;
1362          * - sa1100 doesn't have a third interrupt endpoint
1363          */
1364         if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget))
1365                 use_acm = 0;
1366
1367         gcnum = usb_gadget_controller_number(gadget);
1368         if (gcnum >= 0)
1369                 gs_device_desc.bcdDevice =
1370                                 cpu_to_le16(GS_VERSION_NUM | gcnum);
1371         else {
1372                 printk(KERN_WARNING "gs_bind: controller '%s' not recognized\n",
1373                         gadget->name);
1374                 /* unrecognized, but safe unless bulk is REALLY quirky */
1375                 gs_device_desc.bcdDevice =
1376                         __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
1377         }
1378
1379         usb_ep_autoconfig_reset(gadget);
1380
1381         ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
1382         if (!ep)
1383                 goto autoconf_fail;
1384         EP_IN_NAME = ep->name;
1385         ep->driver_data = ep;   /* claim the endpoint */
1386
1387         ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
1388         if (!ep)
1389                 goto autoconf_fail;
1390         EP_OUT_NAME = ep->name;
1391         ep->driver_data = ep;   /* claim the endpoint */
1392
1393         if (use_acm) {
1394                 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
1395                 if (!ep) {
1396                         printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
1397                         goto autoconf_fail;
1398                 }
1399                 gs_device_desc.idProduct = __constant_cpu_to_le16(
1400                                                 GS_CDC_PRODUCT_ID),
1401                 EP_NOTIFY_NAME = ep->name;
1402                 ep->driver_data = ep;   /* claim the endpoint */
1403         }
1404
1405         gs_device_desc.bDeviceClass = use_acm
1406                 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1407         gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1408
1409 #ifdef CONFIG_USB_GADGET_DUALSPEED
1410         gs_qualifier_desc.bDeviceClass = use_acm
1411                 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1412         /* assume ep0 uses the same packet size for both speeds */
1413         gs_qualifier_desc.bMaxPacketSize0 = gs_device_desc.bMaxPacketSize0;
1414         /* assume endpoints are dual-speed */
1415         gs_highspeed_notify_desc.bEndpointAddress =
1416                 gs_fullspeed_notify_desc.bEndpointAddress;
1417         gs_highspeed_in_desc.bEndpointAddress =
1418                 gs_fullspeed_in_desc.bEndpointAddress;
1419         gs_highspeed_out_desc.bEndpointAddress =
1420                 gs_fullspeed_out_desc.bEndpointAddress;
1421 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1422
1423         usb_gadget_set_selfpowered(gadget);
1424
1425         if (gadget->is_otg) {
1426                 gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
1427                 gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1428                 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1429         }
1430
1431         gs_device = dev = kmalloc(sizeof(struct gs_dev), GFP_KERNEL);
1432         if (dev == NULL)
1433                 return -ENOMEM;
1434
1435         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1436                 system_utsname.sysname, system_utsname.release,
1437                 gadget->name);
1438
1439         memset(dev, 0, sizeof(struct gs_dev));
1440         dev->dev_gadget = gadget;
1441         spin_lock_init(&dev->dev_lock);
1442         INIT_LIST_HEAD(&dev->dev_req_list);
1443         set_gadget_data(gadget, dev);
1444
1445         if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
1446                 printk(KERN_ERR "gs_bind: cannot allocate ports\n");
1447                 gs_unbind(gadget);
1448                 return ret;
1449         }
1450
1451         /* preallocate control response and buffer */
1452         dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
1453                 GFP_KERNEL);
1454         if (dev->dev_ctrl_req == NULL) {
1455                 gs_unbind(gadget);
1456                 return -ENOMEM;
1457         }
1458         dev->dev_ctrl_req->complete = gs_setup_complete;
1459
1460         gadget->ep0->driver_data = dev;
1461
1462         printk(KERN_INFO "gs_bind: %s %s bound\n",
1463                 GS_LONG_NAME, GS_VERSION_STR);
1464
1465         return 0;
1466
1467 autoconf_fail:
1468         printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
1469         return -ENODEV;
1470 }
1471
1472 /*
1473  * gs_unbind
1474  *
1475  * Called on module unload.  Frees the control request and device
1476  * structure.
1477  */
1478 static void __exit gs_unbind(struct usb_gadget *gadget)
1479 {
1480         struct gs_dev *dev = get_gadget_data(gadget);
1481
1482         gs_device = NULL;
1483
1484         /* read/write requests already freed, only control request remains */
1485         if (dev != NULL) {
1486                 if (dev->dev_ctrl_req != NULL) {
1487                         gs_free_req(gadget->ep0, dev->dev_ctrl_req);
1488                         dev->dev_ctrl_req = NULL;
1489                 }
1490                 gs_free_ports(dev);
1491                 kfree(dev);
1492                 set_gadget_data(gadget, NULL);
1493         }
1494
1495         printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
1496                 GS_VERSION_STR);
1497 }
1498
1499 /*
1500  * gs_setup
1501  *
1502  * Implements all the control endpoint functionality that's not
1503  * handled in hardware or the hardware driver.
1504  *
1505  * Returns the size of the data sent to the host, or a negative
1506  * error number.
1507  */
1508 static int gs_setup(struct usb_gadget *gadget,
1509         const struct usb_ctrlrequest *ctrl)
1510 {
1511         int ret = -EOPNOTSUPP;
1512         struct gs_dev *dev = get_gadget_data(gadget);
1513         struct usb_request *req = dev->dev_ctrl_req;
1514         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1515         u16 wValue = le16_to_cpu(ctrl->wValue);
1516         u16 wLength = le16_to_cpu(ctrl->wLength);
1517
1518         switch (ctrl->bRequestType & USB_TYPE_MASK) {
1519         case USB_TYPE_STANDARD:
1520                 ret = gs_setup_standard(gadget,ctrl);
1521                 break;
1522
1523         case USB_TYPE_CLASS:
1524                 ret = gs_setup_class(gadget,ctrl);
1525                 break;
1526
1527         default:
1528                 printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1529                         ctrl->bRequestType, ctrl->bRequest,
1530                         wValue, wIndex, wLength);
1531                 break;
1532         }
1533
1534         /* respond with data transfer before status phase? */
1535         if (ret >= 0) {
1536                 req->length = ret;
1537                 req->zero = ret < wLength
1538                                 && (ret % gadget->ep0->maxpacket) == 0;
1539                 ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1540                 if (ret < 0) {
1541                         printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
1542                                 ret);
1543                         req->status = 0;
1544                         gs_setup_complete(gadget->ep0, req);
1545                 }
1546         }
1547
1548         /* device either stalls (ret < 0) or reports success */
1549         return ret;
1550 }
1551
1552 static int gs_setup_standard(struct usb_gadget *gadget,
1553         const struct usb_ctrlrequest *ctrl)
1554 {
1555         int ret = -EOPNOTSUPP;
1556         struct gs_dev *dev = get_gadget_data(gadget);
1557         struct usb_request *req = dev->dev_ctrl_req;
1558         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1559         u16 wValue = le16_to_cpu(ctrl->wValue);
1560         u16 wLength = le16_to_cpu(ctrl->wLength);
1561
1562         switch (ctrl->bRequest) {
1563         case USB_REQ_GET_DESCRIPTOR:
1564                 if (ctrl->bRequestType != USB_DIR_IN)
1565                         break;
1566
1567                 switch (wValue >> 8) {
1568                 case USB_DT_DEVICE:
1569                         ret = min(wLength,
1570                                 (u16)sizeof(struct usb_device_descriptor));
1571                         memcpy(req->buf, &gs_device_desc, ret);
1572                         break;
1573
1574 #ifdef CONFIG_USB_GADGET_DUALSPEED
1575                 case USB_DT_DEVICE_QUALIFIER:
1576                         if (!gadget->is_dualspeed)
1577                                 break;
1578                         ret = min(wLength,
1579                                 (u16)sizeof(struct usb_qualifier_descriptor));
1580                         memcpy(req->buf, &gs_qualifier_desc, ret);
1581                         break;
1582
1583                 case USB_DT_OTHER_SPEED_CONFIG:
1584                         if (!gadget->is_dualspeed)
1585                                 break;
1586                         /* fall through */
1587 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1588                 case USB_DT_CONFIG:
1589                         ret = gs_build_config_buf(req->buf, gadget->speed,
1590                                 wValue >> 8, wValue & 0xff,
1591                                 gadget->is_otg);
1592                         if (ret >= 0)
1593                                 ret = min(wLength, (u16)ret);
1594                         break;
1595
1596                 case USB_DT_STRING:
1597                         /* wIndex == language code. */
1598                         ret = usb_gadget_get_string(&gs_string_table,
1599                                 wValue & 0xff, req->buf);
1600                         if (ret >= 0)
1601                                 ret = min(wLength, (u16)ret);
1602                         break;
1603                 }
1604                 break;
1605
1606         case USB_REQ_SET_CONFIGURATION:
1607                 if (ctrl->bRequestType != 0)
1608                         break;
1609                 spin_lock(&dev->dev_lock);
1610                 ret = gs_set_config(dev, wValue);
1611                 spin_unlock(&dev->dev_lock);
1612                 break;
1613
1614         case USB_REQ_GET_CONFIGURATION:
1615                 if (ctrl->bRequestType != USB_DIR_IN)
1616                         break;
1617                 *(u8 *)req->buf = dev->dev_config;
1618                 ret = min(wLength, (u16)1);
1619                 break;
1620
1621         case USB_REQ_SET_INTERFACE:
1622                 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1623                                 || !dev->dev_config
1624                                 || wIndex >= GS_MAX_NUM_INTERFACES)
1625                         break;
1626                 if (dev->dev_config == GS_BULK_CONFIG_ID
1627                                 && wIndex != GS_BULK_INTERFACE_ID)
1628                         break;
1629                 /* no alternate interface settings */
1630                 if (wValue != 0)
1631                         break;
1632                 spin_lock(&dev->dev_lock);
1633                 /* PXA hardware partially handles SET_INTERFACE;
1634                  * we need to kluge around that interference.  */
1635                 if (gadget_is_pxa(gadget)) {
1636                         ret = gs_set_config(dev, use_acm ?
1637                                 GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
1638                         goto set_interface_done;
1639                 }
1640                 if (dev->dev_config != GS_BULK_CONFIG_ID
1641                                 && wIndex == GS_CONTROL_INTERFACE_ID) {
1642                         if (dev->dev_notify_ep) {
1643                                 usb_ep_disable(dev->dev_notify_ep);
1644                                 usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
1645                         }
1646                 } else {
1647                         usb_ep_disable(dev->dev_in_ep);
1648                         usb_ep_disable(dev->dev_out_ep);
1649                         usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
1650                         usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
1651                 }
1652                 ret = 0;
1653 set_interface_done:
1654                 spin_unlock(&dev->dev_lock);
1655                 break;
1656
1657         case USB_REQ_GET_INTERFACE:
1658                 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1659                 || dev->dev_config == GS_NO_CONFIG_ID)
1660                         break;
1661                 if (wIndex >= GS_MAX_NUM_INTERFACES
1662                                 || (dev->dev_config == GS_BULK_CONFIG_ID
1663                                 && wIndex != GS_BULK_INTERFACE_ID)) {
1664                         ret = -EDOM;
1665                         break;
1666                 }
1667                 /* no alternate interface settings */
1668                 *(u8 *)req->buf = 0;
1669                 ret = min(wLength, (u16)1);
1670                 break;
1671
1672         default:
1673                 printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1674                         ctrl->bRequestType, ctrl->bRequest,
1675                         wValue, wIndex, wLength);
1676                 break;
1677         }
1678
1679         return ret;
1680 }
1681
1682 static int gs_setup_class(struct usb_gadget *gadget,
1683         const struct usb_ctrlrequest *ctrl)
1684 {
1685         int ret = -EOPNOTSUPP;
1686         struct gs_dev *dev = get_gadget_data(gadget);
1687         struct gs_port *port = dev->dev_port[0];        /* ACM only has one port */
1688         struct usb_request *req = dev->dev_ctrl_req;
1689         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1690         u16 wValue = le16_to_cpu(ctrl->wValue);
1691         u16 wLength = le16_to_cpu(ctrl->wLength);
1692
1693         switch (ctrl->bRequest) {
1694         case USB_CDC_REQ_SET_LINE_CODING:
1695                 ret = min(wLength,
1696                         (u16)sizeof(struct usb_cdc_line_coding));
1697                 if (port) {
1698                         spin_lock(&port->port_lock);
1699                         memcpy(&port->port_line_coding, req->buf, ret);
1700                         spin_unlock(&port->port_lock);
1701                 }
1702                 break;
1703
1704         case USB_CDC_REQ_GET_LINE_CODING:
1705                 port = dev->dev_port[0];        /* ACM only has one port */
1706                 ret = min(wLength,
1707                         (u16)sizeof(struct usb_cdc_line_coding));
1708                 if (port) {
1709                         spin_lock(&port->port_lock);
1710                         memcpy(req->buf, &port->port_line_coding, ret);
1711                         spin_unlock(&port->port_lock);
1712                 }
1713                 break;
1714
1715         case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
1716                 ret = 0;
1717                 break;
1718
1719         default:
1720                 printk(KERN_ERR "gs_setup: unknown class request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1721                         ctrl->bRequestType, ctrl->bRequest,
1722                         wValue, wIndex, wLength);
1723                 break;
1724         }
1725
1726         return ret;
1727 }
1728
1729 /*
1730  * gs_setup_complete
1731  */
1732 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
1733 {
1734         if (req->status || req->actual != req->length) {
1735                 printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
1736                         req->status, req->actual, req->length);
1737         }
1738 }
1739
1740 /*
1741  * gs_disconnect
1742  *
1743  * Called when the device is disconnected.  Frees the closed
1744  * ports and disconnects open ports.  Open ports will be freed
1745  * on close.  Then reallocates the ports for the next connection.
1746  */
1747 static void gs_disconnect(struct usb_gadget *gadget)
1748 {
1749         unsigned long flags;
1750         struct gs_dev *dev = get_gadget_data(gadget);
1751
1752         spin_lock_irqsave(&dev->dev_lock, flags);
1753
1754         gs_reset_config(dev);
1755
1756         /* free closed ports and disconnect open ports */
1757         /* (open ports will be freed when closed) */
1758         gs_free_ports(dev);
1759
1760         /* re-allocate ports for the next connection */
1761         if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
1762                 printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
1763
1764         spin_unlock_irqrestore(&dev->dev_lock, flags);
1765
1766         printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
1767 }
1768
1769 /*
1770  * gs_set_config
1771  *
1772  * Configures the device by enabling device specific
1773  * optimizations, setting up the endpoints, allocating
1774  * read and write requests and queuing read requests.
1775  *
1776  * The device lock must be held when calling this function.
1777  */
1778 static int gs_set_config(struct gs_dev *dev, unsigned config)
1779 {
1780         int i;
1781         int ret = 0;
1782         struct usb_gadget *gadget = dev->dev_gadget;
1783         struct usb_ep *ep;
1784         struct usb_endpoint_descriptor *ep_desc;
1785         struct usb_request *req;
1786         struct gs_req_entry *req_entry;
1787
1788         if (dev == NULL) {
1789                 printk(KERN_ERR "gs_set_config: NULL device pointer\n");
1790                 return 0;
1791         }
1792
1793         if (config == dev->dev_config)
1794                 return 0;
1795
1796         gs_reset_config(dev);
1797
1798         switch (config) {
1799         case GS_NO_CONFIG_ID:
1800                 return 0;
1801         case GS_BULK_CONFIG_ID:
1802                 if (use_acm)
1803                         return -EINVAL;
1804                 /* device specific optimizations */
1805                 if (gadget_is_net2280(gadget))
1806                         net2280_set_fifo_mode(gadget, 1);
1807                 break;
1808         case GS_ACM_CONFIG_ID:
1809                 if (!use_acm)
1810                         return -EINVAL;
1811                 /* device specific optimizations */
1812                 if (gadget_is_net2280(gadget))
1813                         net2280_set_fifo_mode(gadget, 1);
1814                 break;
1815         default:
1816                 return -EINVAL;
1817         }
1818
1819         dev->dev_config = config;
1820
1821         gadget_for_each_ep(ep, gadget) {
1822
1823                 if (EP_NOTIFY_NAME
1824                 && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
1825                         ep_desc = GS_SPEED_SELECT(
1826                                 gadget->speed == USB_SPEED_HIGH,
1827                                 &gs_highspeed_notify_desc,
1828                                 &gs_fullspeed_notify_desc);
1829                         ret = usb_ep_enable(ep,ep_desc);
1830                         if (ret == 0) {
1831                                 ep->driver_data = dev;
1832                                 dev->dev_notify_ep = ep;
1833                                 dev->dev_notify_ep_desc = ep_desc;
1834                         } else {
1835                                 printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
1836                                         ep->name, ret);
1837                                 goto exit_reset_config;
1838                         }
1839                 }
1840
1841                 else if (strcmp(ep->name, EP_IN_NAME) == 0) {
1842                         ep_desc = GS_SPEED_SELECT(
1843                                 gadget->speed == USB_SPEED_HIGH,
1844                                 &gs_highspeed_in_desc,
1845                                 &gs_fullspeed_in_desc);
1846                         ret = usb_ep_enable(ep,ep_desc);
1847                         if (ret == 0) {
1848                                 ep->driver_data = dev;
1849                                 dev->dev_in_ep = ep;
1850                                 dev->dev_in_ep_desc = ep_desc;
1851                         } else {
1852                                 printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
1853                                         ep->name, ret);
1854                                 goto exit_reset_config;
1855                         }
1856                 }
1857
1858                 else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
1859                         ep_desc = GS_SPEED_SELECT(
1860                                 gadget->speed == USB_SPEED_HIGH,
1861                                 &gs_highspeed_out_desc,
1862                                 &gs_fullspeed_out_desc);
1863                         ret = usb_ep_enable(ep,ep_desc);
1864                         if (ret == 0) {
1865                                 ep->driver_data = dev;
1866                                 dev->dev_out_ep = ep;
1867                                 dev->dev_out_ep_desc = ep_desc;
1868                         } else {
1869                                 printk(KERN_ERR "gs_set_config: cannot enable out endpoint %s, ret=%d\n",
1870                                         ep->name, ret);
1871                                 goto exit_reset_config;
1872                         }
1873                 }
1874
1875         }
1876
1877         if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
1878         || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
1879                 printk(KERN_ERR "gs_set_config: cannot find endpoints\n");
1880                 ret = -ENODEV;
1881                 goto exit_reset_config;
1882         }
1883
1884         /* allocate and queue read requests */
1885         ep = dev->dev_out_ep;
1886         for (i=0; i<read_q_size && ret == 0; i++) {
1887                 if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
1888                         req->complete = gs_read_complete;
1889                         if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1890                                 printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
1891                                         ret);
1892                         }
1893                 } else {
1894                         printk(KERN_ERR "gs_set_config: cannot allocate read requests\n");
1895                         ret = -ENOMEM;
1896                         goto exit_reset_config;
1897                 }
1898         }
1899
1900         /* allocate write requests, and put on free list */
1901         ep = dev->dev_in_ep;
1902         for (i=0; i<write_q_size; i++) {
1903                 if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
1904                         req_entry->re_req->complete = gs_write_complete;
1905                         list_add(&req_entry->re_entry, &dev->dev_req_list);
1906                 } else {
1907                         printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
1908                         ret = -ENOMEM;
1909                         goto exit_reset_config;
1910                 }
1911         }
1912
1913         printk(KERN_INFO "gs_set_config: %s configured, %s speed %s config\n",
1914                 GS_LONG_NAME,
1915                 gadget->speed == USB_SPEED_HIGH ? "high" : "full",
1916                 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
1917
1918         return 0;
1919
1920 exit_reset_config:
1921         gs_reset_config(dev);
1922         return ret;
1923 }
1924
1925 /*
1926  * gs_reset_config
1927  *
1928  * Mark the device as not configured, disable all endpoints,
1929  * which forces completion of pending I/O and frees queued
1930  * requests, and free the remaining write requests on the
1931  * free list.
1932  *
1933  * The device lock must be held when calling this function.
1934  */
1935 static void gs_reset_config(struct gs_dev *dev)
1936 {
1937         struct gs_req_entry *req_entry;
1938
1939         if (dev == NULL) {
1940                 printk(KERN_ERR "gs_reset_config: NULL device pointer\n");
1941                 return;
1942         }
1943
1944         if (dev->dev_config == GS_NO_CONFIG_ID)
1945                 return;
1946
1947         dev->dev_config = GS_NO_CONFIG_ID;
1948
1949         /* free write requests on the free list */
1950         while(!list_empty(&dev->dev_req_list)) {
1951                 req_entry = list_entry(dev->dev_req_list.next,
1952                         struct gs_req_entry, re_entry);
1953                 list_del(&req_entry->re_entry);
1954                 gs_free_req_entry(dev->dev_in_ep, req_entry);
1955         }
1956
1957         /* disable endpoints, forcing completion of pending i/o; */
1958         /* completion handlers free their requests in this case */
1959         if (dev->dev_notify_ep) {
1960                 usb_ep_disable(dev->dev_notify_ep);
1961                 dev->dev_notify_ep = NULL;
1962         }
1963         if (dev->dev_in_ep) {
1964                 usb_ep_disable(dev->dev_in_ep);
1965                 dev->dev_in_ep = NULL;
1966         }
1967         if (dev->dev_out_ep) {
1968                 usb_ep_disable(dev->dev_out_ep);
1969                 dev->dev_out_ep = NULL;
1970         }
1971 }
1972
1973 /*
1974  * gs_build_config_buf
1975  *
1976  * Builds the config descriptors in the given buffer and returns the
1977  * length, or a negative error number.
1978  */
1979 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
1980         u8 type, unsigned int index, int is_otg)
1981 {
1982         int len;
1983         int high_speed;
1984         const struct usb_config_descriptor *config_desc;
1985         const struct usb_descriptor_header **function;
1986
1987         if (index >= gs_device_desc.bNumConfigurations)
1988                 return -EINVAL;
1989
1990         /* other speed switches high and full speed */
1991         high_speed = (speed == USB_SPEED_HIGH);
1992         if (type == USB_DT_OTHER_SPEED_CONFIG)
1993                 high_speed = !high_speed;
1994
1995         if (use_acm) {
1996                 config_desc = &gs_acm_config_desc;
1997                 function = GS_SPEED_SELECT(high_speed,
1998                         gs_acm_highspeed_function,
1999                         gs_acm_fullspeed_function);
2000         } else {
2001                 config_desc = &gs_bulk_config_desc;
2002                 function = GS_SPEED_SELECT(high_speed,
2003                         gs_bulk_highspeed_function,
2004                         gs_bulk_fullspeed_function);
2005         }
2006
2007         /* for now, don't advertise srp-only devices */
2008         if (!is_otg)
2009                 function++;
2010
2011         len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
2012         if (len < 0)
2013                 return len;
2014
2015         ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
2016
2017         return len;
2018 }
2019
2020 /*
2021  * gs_alloc_req
2022  *
2023  * Allocate a usb_request and its buffer.  Returns a pointer to the
2024  * usb_request or NULL if there is an error.
2025  */
2026 static struct usb_request *
2027 gs_alloc_req(struct usb_ep *ep, unsigned int len, gfp_t kmalloc_flags)
2028 {
2029         struct usb_request *req;
2030
2031         if (ep == NULL)
2032                 return NULL;
2033
2034         req = usb_ep_alloc_request(ep, kmalloc_flags);
2035
2036         if (req != NULL) {
2037                 req->length = len;
2038                 req->buf = kmalloc(len, kmalloc_flags);
2039                 if (req->buf == NULL) {
2040                         usb_ep_free_request(ep, req);
2041                         return NULL;
2042                 }
2043         }
2044
2045         return req;
2046 }
2047
2048 /*
2049  * gs_free_req
2050  *
2051  * Free a usb_request and its buffer.
2052  */
2053 static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
2054 {
2055         if (ep != NULL && req != NULL) {
2056                 kfree(req->buf);
2057                 usb_ep_free_request(ep, req);
2058         }
2059 }
2060
2061 /*
2062  * gs_alloc_req_entry
2063  *
2064  * Allocates a request and its buffer, using the given
2065  * endpoint, buffer len, and kmalloc flags.
2066  */
2067 static struct gs_req_entry *
2068 gs_alloc_req_entry(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
2069 {
2070         struct gs_req_entry     *req;
2071
2072         req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
2073         if (req == NULL)
2074                 return NULL;
2075
2076         req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
2077         if (req->re_req == NULL) {
2078                 kfree(req);
2079                 return NULL;
2080         }
2081
2082         req->re_req->context = req;
2083
2084         return req;
2085 }
2086
2087 /*
2088  * gs_free_req_entry
2089  *
2090  * Frees a request and its buffer.
2091  */
2092 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
2093 {
2094         if (ep != NULL && req != NULL) {
2095                 if (req->re_req != NULL)
2096                         gs_free_req(ep, req->re_req);
2097                 kfree(req);
2098         }
2099 }
2100
2101 /*
2102  * gs_alloc_ports
2103  *
2104  * Allocate all ports and set the gs_dev struct to point to them.
2105  * Return 0 if successful, or a negative error number.
2106  *
2107  * The device lock is normally held when calling this function.
2108  */
2109 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags)
2110 {
2111         int i;
2112         struct gs_port *port;
2113
2114         if (dev == NULL)
2115                 return -EIO;
2116
2117         for (i=0; i<GS_NUM_PORTS; i++) {
2118                 if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
2119                         return -ENOMEM;
2120
2121                 port->port_dev = dev;
2122                 port->port_num = i;
2123                 port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
2124                 port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
2125                 port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
2126                 port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
2127                 spin_lock_init(&port->port_lock);
2128                 init_waitqueue_head(&port->port_write_wait);
2129
2130                 dev->dev_port[i] = port;
2131         }
2132
2133         return 0;
2134 }
2135
2136 /*
2137  * gs_free_ports
2138  *
2139  * Free all closed ports.  Open ports are disconnected by
2140  * freeing their write buffers, setting their device pointers
2141  * and the pointers to them in the device to NULL.  These
2142  * ports will be freed when closed.
2143  *
2144  * The device lock is normally held when calling this function.
2145  */
2146 static void gs_free_ports(struct gs_dev *dev)
2147 {
2148         int i;
2149         unsigned long flags;
2150         struct gs_port *port;
2151
2152         if (dev == NULL)
2153                 return;
2154
2155         for (i=0; i<GS_NUM_PORTS; i++) {
2156                 if ((port=dev->dev_port[i]) != NULL) {
2157                         dev->dev_port[i] = NULL;
2158
2159                         spin_lock_irqsave(&port->port_lock, flags);
2160
2161                         if (port->port_write_buf != NULL) {
2162                                 gs_buf_free(port->port_write_buf);
2163                                 port->port_write_buf = NULL;
2164                         }
2165
2166                         if (port->port_open_count > 0 || port->port_in_use) {
2167                                 port->port_dev = NULL;
2168                                 wake_up_interruptible(&port->port_write_wait);
2169                                 if (port->port_tty) {
2170                                         wake_up_interruptible(&port->port_tty->read_wait);
2171                                         wake_up_interruptible(&port->port_tty->write_wait);
2172                                 }
2173                                 spin_unlock_irqrestore(&port->port_lock, flags);
2174                         } else {
2175                                 spin_unlock_irqrestore(&port->port_lock, flags);
2176                                 kfree(port);
2177                         }
2178
2179                 }
2180         }
2181 }
2182
2183 /* Circular Buffer */
2184
2185 /*
2186  * gs_buf_alloc
2187  *
2188  * Allocate a circular buffer and all associated memory.
2189  */
2190 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags)
2191 {
2192         struct gs_buf *gb;
2193
2194         if (size == 0)
2195                 return NULL;
2196
2197         gb = (struct gs_buf *)kmalloc(sizeof(struct gs_buf), kmalloc_flags);
2198         if (gb == NULL)
2199                 return NULL;
2200
2201         gb->buf_buf = kmalloc(size, kmalloc_flags);
2202         if (gb->buf_buf == NULL) {
2203                 kfree(gb);
2204                 return NULL;
2205         }
2206
2207         gb->buf_size = size;
2208         gb->buf_get = gb->buf_put = gb->buf_buf;
2209
2210         return gb;
2211 }
2212
2213 /*
2214  * gs_buf_free
2215  *
2216  * Free the buffer and all associated memory.
2217  */
2218 void gs_buf_free(struct gs_buf *gb)
2219 {
2220         if (gb) {
2221                 kfree(gb->buf_buf);
2222                 kfree(gb);
2223         }
2224 }
2225
2226 /*
2227  * gs_buf_clear
2228  *
2229  * Clear out all data in the circular buffer.
2230  */
2231 void gs_buf_clear(struct gs_buf *gb)
2232 {
2233         if (gb != NULL)
2234                 gb->buf_get = gb->buf_put;
2235                 /* equivalent to a get of all data available */
2236 }
2237
2238 /*
2239  * gs_buf_data_avail
2240  *
2241  * Return the number of bytes of data available in the circular
2242  * buffer.
2243  */
2244 unsigned int gs_buf_data_avail(struct gs_buf *gb)
2245 {
2246         if (gb != NULL)
2247                 return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
2248         else
2249                 return 0;
2250 }
2251
2252 /*
2253  * gs_buf_space_avail
2254  *
2255  * Return the number of bytes of space available in the circular
2256  * buffer.
2257  */
2258 unsigned int gs_buf_space_avail(struct gs_buf *gb)
2259 {
2260         if (gb != NULL)
2261                 return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
2262         else
2263                 return 0;
2264 }
2265
2266 /*
2267  * gs_buf_put
2268  *
2269  * Copy data data from a user buffer and put it into the circular buffer.
2270  * Restrict to the amount of space available.
2271  *
2272  * Return the number of bytes copied.
2273  */
2274 unsigned int gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
2275 {
2276         unsigned int len;
2277
2278         if (gb == NULL)
2279                 return 0;
2280
2281         len  = gs_buf_space_avail(gb);
2282         if (count > len)
2283                 count = len;
2284
2285         if (count == 0)
2286                 return 0;
2287
2288         len = gb->buf_buf + gb->buf_size - gb->buf_put;
2289         if (count > len) {
2290                 memcpy(gb->buf_put, buf, len);
2291                 memcpy(gb->buf_buf, buf+len, count - len);
2292                 gb->buf_put = gb->buf_buf + count - len;
2293         } else {
2294                 memcpy(gb->buf_put, buf, count);
2295                 if (count < len)
2296                         gb->buf_put += count;
2297                 else /* count == len */
2298                         gb->buf_put = gb->buf_buf;
2299         }
2300
2301         return count;
2302 }
2303
2304 /*
2305  * gs_buf_get
2306  *
2307  * Get data from the circular buffer and copy to the given buffer.
2308  * Restrict to the amount of data available.
2309  *
2310  * Return the number of bytes copied.
2311  */
2312 unsigned int gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
2313 {
2314         unsigned int len;
2315
2316         if (gb == NULL)
2317                 return 0;
2318
2319         len = gs_buf_data_avail(gb);
2320         if (count > len)
2321                 count = len;
2322
2323         if (count == 0)
2324                 return 0;
2325
2326         len = gb->buf_buf + gb->buf_size - gb->buf_get;
2327         if (count > len) {
2328                 memcpy(buf, gb->buf_get, len);
2329                 memcpy(buf+len, gb->buf_buf, count - len);
2330                 gb->buf_get = gb->buf_buf + count - len;
2331         } else {
2332                 memcpy(buf, gb->buf_get, count);
2333                 if (count < len)
2334                         gb->buf_get += count;
2335                 else /* count == len */
2336                         gb->buf_get = gb->buf_buf;
2337         }
2338
2339         return count;
2340 }