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 /* Wait Cond */
  55
  56 #define __wait_cond_interruptible(wq, condition, lock, flags, ret)      \
  57 do {                                                                    \
  58         wait_queue_t __wait;                                            \
  59         init_waitqueue_entry(&__wait, current);                         \
  60                                                                         \
  61         add_wait_queue(&wq, &__wait);                                   \
  62         for (;;) {                                                      \
  63                 set_current_state(TASK_INTERRUPTIBLE);                  \
  64                 if (condition)                                          \
  65                         break;                                          \
  66                 if (!signal_pending(current)) {                         \
  67                         spin_unlock_irqrestore(lock, flags);            \
  68                         schedule();                                     \
  69                         spin_lock_irqsave(lock, flags);                 \
  70                         continue;                                       \
  71                 }                                                       \
  72                 ret = -ERESTARTSYS;                                     \
  73                 break;                                                  \
  74         }                                                               \
  75         current->state = TASK_RUNNING;                                  \
  76         remove_wait_queue(&wq, &__wait);                                \
  77 } while (0)
  78
  79 #define wait_cond_interruptible(wq, condition, lock, flags)             \
  80 ({                                                                      \
  81         int __ret = 0;                                                  \
  82         if (!(condition))                                               \
  83                 __wait_cond_interruptible(wq, condition, lock, flags,   \
  84                                                 __ret);                 \
  85         __ret;                                                          \
  86 })
  87
  88 #define __wait_cond_interruptible_timeout(wq, condition, lock, flags,   \
  89                                                 timeout, ret)           \
  90 do {                                                                    \
  91         signed long __timeout = timeout;                                \
  92         wait_queue_t __wait;                                            \
  93         init_waitqueue_entry(&__wait, current);                         \
  94                                                                         \
  95         add_wait_queue(&wq, &__wait);                                   \
  96         for (;;) {                                                      \
  97                 set_current_state(TASK_INTERRUPTIBLE);                  \
  98                 if (__timeout == 0)                                     \
  99                         break;                                          \
 100                 if (condition)                                          \
 101                         break;                                          \
 102                 if (!signal_pending(current)) {                         \
 103                         spin_unlock_irqrestore(lock, flags);            \
 104                         __timeout = schedule_timeout(__timeout);        \
 105                         spin_lock_irqsave(lock, flags);                 \
 106                         continue;                                       \
 107                 }                                                       \
 108                 ret = -ERESTARTSYS;                                     \
 109                 break;                                                  \
 110         }                                                               \
 111         current->state = TASK_RUNNING;                                  \
 112         remove_wait_queue(&wq, &__wait);                                \
 113 } while (0)
 114
 115 #define wait_cond_interruptible_timeout(wq, condition, lock, flags,     \
 116                                                 timeout)                \
 117 ({                                                                      \
 118         int __ret = 0;                                                  \
 119         if (!(condition))                                               \
 120                 __wait_cond_interruptible_timeout(wq, condition, lock,  \
 121                                                 flags, timeout, __ret); \
 122         __ret;                                                          \
 123 })
 124
 125
 126 /* Defines */
 127
 128 #define GS_VERSION_STR                  "v2.0"
 129 #define GS_VERSION_NUM                  0x0200
 130
 131 #define GS_LONG_NAME                    "Gadget Serial"
 132 #define GS_SHORT_NAME                   "g_serial"
 133
 134 #define GS_MAJOR                        127
 135 #define GS_MINOR_START                  0
 136
 137 #define GS_NUM_PORTS                    16
 138
 139 #define GS_NUM_CONFIGS                  1
 140 #define GS_NO_CONFIG_ID                 0
 141 #define GS_BULK_CONFIG_ID               1
 142 #define GS_ACM_CONFIG_ID                2
 143
 144 #define GS_MAX_NUM_INTERFACES           2
 145 #define GS_BULK_INTERFACE_ID            0
 146 #define GS_CONTROL_INTERFACE_ID         0
 147 #define GS_DATA_INTERFACE_ID            1
 148
 149 #define GS_MAX_DESC_LEN                 256
 150
 151 #define GS_DEFAULT_READ_Q_SIZE          32
 152 #define GS_DEFAULT_WRITE_Q_SIZE         32
 153
 154 #define GS_DEFAULT_WRITE_BUF_SIZE       8192
 155 #define GS_TMP_BUF_SIZE                 8192
 156
 157 #define GS_CLOSE_TIMEOUT                15
 158
 159 #define GS_DEFAULT_USE_ACM              0
 160
 161 #define GS_DEFAULT_DTE_RATE             9600
 162 #define GS_DEFAULT_DATA_BITS            8
 163 #define GS_DEFAULT_PARITY               USB_CDC_NO_PARITY
 164 #define GS_DEFAULT_CHAR_FORMAT          USB_CDC_1_STOP_BITS
 165
 166 /* select highspeed/fullspeed, hiding highspeed if not configured */
 167 #ifdef CONFIG_USB_GADGET_DUALSPEED
 168 #define GS_SPEED_SELECT(is_hs,hs,fs) ((is_hs) ? (hs) : (fs))
 169 #else
 170 #define GS_SPEED_SELECT(is_hs,hs,fs) (fs)
 171 #endif /* CONFIG_USB_GADGET_DUALSPEED */
 172
 173 /* debug settings */
 174 #ifdef GS_DEBUG
 175 static int debug = 1;
 176
 177 #define gs_debug(format, arg...) \
 178         do { if (debug) printk(KERN_DEBUG format, ## arg); } while(0)
 179 #define gs_debug_level(level, format, arg...) \
 180         do { if (debug>=level) printk(KERN_DEBUG format, ## arg); } while(0)
 181
 182 #else
 183
 184 #define gs_debug(format, arg...) \
 185         do { } while(0)
 186 #define gs_debug_level(level, format, arg...) \
 187         do { } while(0)
 188
 189 #endif /* GS_DEBUG */
 190
 191 /* Thanks to NetChip Technologies for donating this product ID.
 192  *
 193  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 194  * Instead:  allocate your own, using normal USB-IF procedures.
 195  */
 196 #define GS_VENDOR_ID                    0x0525  /* NetChip */
 197 #define GS_PRODUCT_ID                   0xa4a6  /* Linux-USB Serial Gadget */
 198 #define GS_CDC_PRODUCT_ID               0xa4a7  /* ... as CDC-ACM */
 199
 200 #define GS_LOG2_NOTIFY_INTERVAL         5       /* 1 << 5 == 32 msec */
 201 #define GS_NOTIFY_MAXPACKET             8
 202
 203
 204 /* Structures */
 205
 206 struct gs_dev;
 207
 208 /* circular buffer */
 209 struct gs_buf {
 210         unsigned int            buf_size;
 211         char                    *buf_buf;
 212         char                    *buf_get;
 213         char                    *buf_put;
 214 };
 215
 216 /* list of requests */
 217 struct gs_req_entry {
 218         struct list_head        re_entry;
 219         struct usb_request      *re_req;
 220 };
 221
 222 /* the port structure holds info for each port, one for each minor number */
 223 struct gs_port {
 224         struct gs_dev           *port_dev;      /* pointer to device struct */
 225         struct tty_struct       *port_tty;      /* pointer to tty struct */
 226         spinlock_t              port_lock;
 227         int                     port_num;
 228         int                     port_open_count;
 229         int                     port_in_use;    /* open/close in progress */
 230         wait_queue_head_t       port_write_wait;/* waiting to write */
 231         struct gs_buf           *port_write_buf;
 232         struct usb_cdc_line_coding      port_line_coding;
 233 };
 234
 235 /* the device structure holds info for the USB device */
 236 struct gs_dev {
 237         struct usb_gadget       *dev_gadget;    /* gadget device pointer */
 238         spinlock_t              dev_lock;       /* lock for set/reset config */
 239         int                     dev_config;     /* configuration number */
 240         struct usb_ep           *dev_notify_ep; /* address of notify endpoint */
 241         struct usb_ep           *dev_in_ep;     /* address of in endpoint */
 242         struct usb_ep           *dev_out_ep;    /* address of out endpoint */
 243         struct usb_endpoint_descriptor          /* descriptor of notify ep */
 244                                 *dev_notify_ep_desc;
 245         struct usb_endpoint_descriptor          /* descriptor of in endpoint */
 246                                 *dev_in_ep_desc;
 247         struct usb_endpoint_descriptor          /* descriptor of out endpoint */
 248                                 *dev_out_ep_desc;
 249         struct usb_request      *dev_ctrl_req;  /* control request */
 250         struct list_head        dev_req_list;   /* list of write requests */
 251         int                     dev_sched_port; /* round robin port scheduled */
 252         struct gs_port          *dev_port[GS_NUM_PORTS]; /* the ports */
 253 };
 254
 255
 256 /* Functions */
 257
 258 /* module */
 259 static int __init gs_module_init(void);
 260 static void __exit gs_module_exit(void);
 261
 262 /* tty driver */
 263 static int gs_open(struct tty_struct *tty, struct file *file);
 264 static void gs_close(struct tty_struct *tty, struct file *file);
 265 static int gs_write(struct tty_struct *tty,
 266         const unsigned char *buf, int count);
 267 static void gs_put_char(struct tty_struct *tty, unsigned char ch);
 268 static void gs_flush_chars(struct tty_struct *tty);
 269 static int gs_write_room(struct tty_struct *tty);
 270 static int gs_chars_in_buffer(struct tty_struct *tty);
 271 static void gs_throttle(struct tty_struct * tty);
 272 static void gs_unthrottle(struct tty_struct * tty);
 273 static void gs_break(struct tty_struct *tty, int break_state);
 274 static int  gs_ioctl(struct tty_struct *tty, struct file *file,
 275         unsigned int cmd, unsigned long arg);
 276 static void gs_set_termios(struct tty_struct *tty, struct termios *old);
 277
 278 static int gs_send(struct gs_dev *dev);
 279 static int gs_send_packet(struct gs_dev *dev, char *packet,
 280         unsigned int size);
 281 static int gs_recv_packet(struct gs_dev *dev, char *packet,
 282         unsigned int size);
 283 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
 284 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
 285
 286 /* gadget driver */
 287 static int gs_bind(struct usb_gadget *gadget);
 288 static void gs_unbind(struct usb_gadget *gadget);
 289 static int gs_setup(struct usb_gadget *gadget,
 290         const struct usb_ctrlrequest *ctrl);
 291 static int gs_setup_standard(struct usb_gadget *gadget,
 292         const struct usb_ctrlrequest *ctrl);
 293 static int gs_setup_class(struct usb_gadget *gadget,
 294         const struct usb_ctrlrequest *ctrl);
 295 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
 296 static void gs_disconnect(struct usb_gadget *gadget);
 297 static int gs_set_config(struct gs_dev *dev, unsigned config);
 298 static void gs_reset_config(struct gs_dev *dev);
 299 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
 300                 u8 type, unsigned int index, int is_otg);
 301
 302 static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
 303         gfp_t kmalloc_flags);
 304 static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
 305
 306 static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
 307         gfp_t kmalloc_flags);
 308 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
 309
 310 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags);
 311 static void gs_free_ports(struct gs_dev *dev);
 312
 313 /* circular buffer */
 314 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags);
 315 static void gs_buf_free(struct gs_buf *gb);
 316 static void gs_buf_clear(struct gs_buf *gb);
 317 static unsigned int gs_buf_data_avail(struct gs_buf *gb);
 318 static unsigned int gs_buf_space_avail(struct gs_buf *gb);
 319 static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
 320         unsigned int count);
 321 static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
 322         unsigned int count);
 323
 324 /* external functions */
 325 extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
 326
 327
 328 /* Globals */
 329
 330 static struct gs_dev *gs_device;
 331
 332 static const char *EP_IN_NAME;
 333 static const char *EP_OUT_NAME;
 334 static const char *EP_NOTIFY_NAME;
 335
 336 static struct semaphore gs_open_close_sem[GS_NUM_PORTS];
 337
 338 static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
 339 static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
 340
 341 static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
 342
 343 static unsigned int use_acm = GS_DEFAULT_USE_ACM;
 344
 345
 346 /* tty driver struct */
 347 static struct tty_operations gs_tty_ops = {
 348         .open =                 gs_open,
 349         .close =                gs_close,
 350         .write =                gs_write,
 351         .put_char =             gs_put_char,
 352         .flush_chars =          gs_flush_chars,
 353         .write_room =           gs_write_room,
 354         .ioctl =                gs_ioctl,
 355         .set_termios =          gs_set_termios,
 356         .throttle =             gs_throttle,
 357         .unthrottle =           gs_unthrottle,
 358         .break_ctl =            gs_break,
 359         .chars_in_buffer =      gs_chars_in_buffer,
 360 };
 361 static struct tty_driver *gs_tty_driver;
 362
 363 /* gadget driver struct */
 364 static struct usb_gadget_driver gs_gadget_driver = {
 365 #ifdef CONFIG_USB_GADGET_DUALSPEED
 366         .speed =                USB_SPEED_HIGH,
 367 #else
 368         .speed =                USB_SPEED_FULL,
 369 #endif /* CONFIG_USB_GADGET_DUALSPEED */
 370         .function =             GS_LONG_NAME,
 371         .bind =                 gs_bind,
 372         .unbind =               __exit_p(gs_unbind),
 373         .setup =                gs_setup,
 374         .disconnect =           gs_disconnect,
 375         .driver = {
 376                 .name =         GS_SHORT_NAME,
 377         },
 378 };
 379
 380
 381 /* USB descriptors */
 382
 383 #define GS_MANUFACTURER_STR_ID  1
 384 #define GS_PRODUCT_STR_ID       2
 385 #define GS_SERIAL_STR_ID        3
 386 #define GS_BULK_CONFIG_STR_ID   4
 387 #define GS_ACM_CONFIG_STR_ID    5
 388 #define GS_CONTROL_STR_ID       6
 389 #define GS_DATA_STR_ID          7
 390
 391 /* static strings, in UTF-8 */
 392 static char manufacturer[50];
 393 static struct usb_string gs_strings[] = {
 394         { GS_MANUFACTURER_STR_ID, manufacturer },
 395         { GS_PRODUCT_STR_ID, GS_LONG_NAME },
 396         { GS_SERIAL_STR_ID, "0" },
 397         { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
 398         { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
 399         { GS_CONTROL_STR_ID, "Gadget Serial Control" },
 400         { GS_DATA_STR_ID, "Gadget Serial Data" },
 401         {  } /* end of list */
 402 };
 403
 404 static struct usb_gadget_strings gs_string_table = {
 405         .language =             0x0409, /* en-us */
 406         .strings =              gs_strings,
 407 };
 408
 409 static struct usb_device_descriptor gs_device_desc = {
 410         .bLength =              USB_DT_DEVICE_SIZE,
 411         .bDescriptorType =      USB_DT_DEVICE,
 412         .bcdUSB =               __constant_cpu_to_le16(0x0200),
 413         .bDeviceSubClass =      0,
 414         .bDeviceProtocol =      0,
 415         .idVendor =             __constant_cpu_to_le16(GS_VENDOR_ID),
 416         .idProduct =            __constant_cpu_to_le16(GS_PRODUCT_ID),
 417         .iManufacturer =        GS_MANUFACTURER_STR_ID,
 418         .iProduct =             GS_PRODUCT_STR_ID,
 419         .iSerialNumber =        GS_SERIAL_STR_ID,
 420         .bNumConfigurations =   GS_NUM_CONFIGS,
 421 };
 422
 423 static struct usb_otg_descriptor gs_otg_descriptor = {
 424         .bLength =              sizeof(gs_otg_descriptor),
 425         .bDescriptorType =      USB_DT_OTG,
 426         .bmAttributes =         USB_OTG_SRP,
 427 };
 428
 429 static struct usb_config_descriptor gs_bulk_config_desc = {
 430         .bLength =              USB_DT_CONFIG_SIZE,
 431         .bDescriptorType =      USB_DT_CONFIG,
 432         /* .wTotalLength computed dynamically */
 433         .bNumInterfaces =       1,
 434         .bConfigurationValue =  GS_BULK_CONFIG_ID,
 435         .iConfiguration =       GS_BULK_CONFIG_STR_ID,
 436         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 437         .bMaxPower =            1,
 438 };
 439
 440 static struct usb_config_descriptor gs_acm_config_desc = {
 441         .bLength =              USB_DT_CONFIG_SIZE,
 442         .bDescriptorType =      USB_DT_CONFIG,
 443         /* .wTotalLength computed dynamically */
 444         .bNumInterfaces =       2,
 445         .bConfigurationValue =  GS_ACM_CONFIG_ID,
 446         .iConfiguration =       GS_ACM_CONFIG_STR_ID,
 447         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 448         .bMaxPower =            1,
 449 };
 450
 451 static const struct usb_interface_descriptor gs_bulk_interface_desc = {
 452         .bLength =              USB_DT_INTERFACE_SIZE,
 453         .bDescriptorType =      USB_DT_INTERFACE,
 454         .bInterfaceNumber =     GS_BULK_INTERFACE_ID,
 455         .bNumEndpoints =        2,
 456         .bInterfaceClass =      USB_CLASS_CDC_DATA,
 457         .bInterfaceSubClass =   0,
 458         .bInterfaceProtocol =   0,
 459         .iInterface =           GS_DATA_STR_ID,
 460 };
 461
 462 static const struct usb_interface_descriptor gs_control_interface_desc = {
 463         .bLength =              USB_DT_INTERFACE_SIZE,
 464         .bDescriptorType =      USB_DT_INTERFACE,
 465         .bInterfaceNumber =     GS_CONTROL_INTERFACE_ID,
 466         .bNumEndpoints =        1,
 467         .bInterfaceClass =      USB_CLASS_COMM,
 468         .bInterfaceSubClass =   USB_CDC_SUBCLASS_ACM,
 469         .bInterfaceProtocol =   USB_CDC_ACM_PROTO_AT_V25TER,
 470         .iInterface =           GS_CONTROL_STR_ID,
 471 };
 472
 473 static const struct usb_interface_descriptor gs_data_interface_desc = {
 474         .bLength =              USB_DT_INTERFACE_SIZE,
 475         .bDescriptorType =      USB_DT_INTERFACE,
 476         .bInterfaceNumber =     GS_DATA_INTERFACE_ID,
 477         .bNumEndpoints =        2,
 478         .bInterfaceClass =      USB_CLASS_CDC_DATA,
 479         .bInterfaceSubClass =   0,
 480         .bInterfaceProtocol =   0,
 481         .iInterface =           GS_DATA_STR_ID,
 482 };
 483
 484 static const struct usb_cdc_header_desc gs_header_desc = {
 485         .bLength =              sizeof(gs_header_desc),
 486         .bDescriptorType =      USB_DT_CS_INTERFACE,
 487         .bDescriptorSubType =   USB_CDC_HEADER_TYPE,
 488         .bcdCDC =               __constant_cpu_to_le16(0x0110),
 489 };
 490
 491 static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
 492         .bLength =              sizeof(gs_call_mgmt_descriptor),
 493         .bDescriptorType =      USB_DT_CS_INTERFACE,
 494         .bDescriptorSubType =   USB_CDC_CALL_MANAGEMENT_TYPE,
 495         .bmCapabilities =       0,
 496         .bDataInterface =       1,      /* index of data interface */
 497 };
 498
 499 static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
 500         .bLength =              sizeof(gs_acm_descriptor),
 501         .bDescriptorType =      USB_DT_CS_INTERFACE,
 502         .bDescriptorSubType =   USB_CDC_ACM_TYPE,
 503         .bmCapabilities =       0,
 504 };
 505
 506 static const struct usb_cdc_union_desc gs_union_desc = {
 507         .bLength =              sizeof(gs_union_desc),
 508         .bDescriptorType =      USB_DT_CS_INTERFACE,
 509         .bDescriptorSubType =   USB_CDC_UNION_TYPE,
 510         .bMasterInterface0 =    0,      /* index of control interface */
 511         .bSlaveInterface0 =     1,      /* index of data interface */
 512 };
 513
 514 static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = {
 515         .bLength =              USB_DT_ENDPOINT_SIZE,
 516         .bDescriptorType =      USB_DT_ENDPOINT,
 517         .bEndpointAddress =     USB_DIR_IN,
 518         .bmAttributes =         USB_ENDPOINT_XFER_INT,
 519         .wMaxPacketSize =       __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
 520         .bInterval =            1 << GS_LOG2_NOTIFY_INTERVAL,
 521 };
 522
 523 static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
 524         .bLength =              USB_DT_ENDPOINT_SIZE,
 525         .bDescriptorType =      USB_DT_ENDPOINT,
 526         .bEndpointAddress =     USB_DIR_IN,
 527         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 528 };
 529
 530 static struct usb_endpoint_descriptor gs_fullspeed_out_desc = {
 531         .bLength =              USB_DT_ENDPOINT_SIZE,
 532         .bDescriptorType =      USB_DT_ENDPOINT,
 533         .bEndpointAddress =     USB_DIR_OUT,
 534         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 535 };
 536
 537 static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = {
 538         (struct usb_descriptor_header *) &gs_otg_descriptor,
 539         (struct usb_descriptor_header *) &gs_bulk_interface_desc,
 540         (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
 541         (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
 542         NULL,
 543 };
 544
 545 static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = {
 546         (struct usb_descriptor_header *) &gs_otg_descriptor,
 547         (struct usb_descriptor_header *) &gs_control_interface_desc,
 548         (struct usb_descriptor_header *) &gs_header_desc,
 549         (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
 550         (struct usb_descriptor_header *) &gs_acm_descriptor,
 551         (struct usb_descriptor_header *) &gs_union_desc,
 552         (struct usb_descriptor_header *) &gs_fullspeed_notify_desc,
 553         (struct usb_descriptor_header *) &gs_data_interface_desc,
 554         (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
 555         (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
 556         NULL,
 557 };
 558
 559 #ifdef CONFIG_USB_GADGET_DUALSPEED
 560 static struct usb_endpoint_descriptor gs_highspeed_notify_desc = {
 561         .bLength =              USB_DT_ENDPOINT_SIZE,
 562         .bDescriptorType =      USB_DT_ENDPOINT,
 563         .bEndpointAddress =     USB_DIR_IN,
 564         .bmAttributes =         USB_ENDPOINT_XFER_INT,
 565         .wMaxPacketSize =       __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
 566         .bInterval =            GS_LOG2_NOTIFY_INTERVAL+4,
 567 };
 568
 569 static struct usb_endpoint_descriptor gs_highspeed_in_desc = {
 570         .bLength =              USB_DT_ENDPOINT_SIZE,
 571         .bDescriptorType =      USB_DT_ENDPOINT,
 572         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 573         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 574 };
 575
 576 static struct usb_endpoint_descriptor gs_highspeed_out_desc = {
 577         .bLength =              USB_DT_ENDPOINT_SIZE,
 578         .bDescriptorType =      USB_DT_ENDPOINT,
 579         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 580         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 581 };
 582
 583 static struct usb_qualifier_descriptor gs_qualifier_desc = {
 584         .bLength =              sizeof(struct usb_qualifier_descriptor),
 585         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
 586         .bcdUSB =               __constant_cpu_to_le16 (0x0200),
 587         /* assumes ep0 uses the same value for both speeds ... */
 588         .bNumConfigurations =   GS_NUM_CONFIGS,
 589 };
 590
 591 static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = {
 592         (struct usb_descriptor_header *) &gs_otg_descriptor,
 593         (struct usb_descriptor_header *) &gs_bulk_interface_desc,
 594         (struct usb_descriptor_header *) &gs_highspeed_in_desc,
 595         (struct usb_descriptor_header *) &gs_highspeed_out_desc,
 596         NULL,
 597 };
 598
 599 static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
 600         (struct usb_descriptor_header *) &gs_otg_descriptor,
 601         (struct usb_descriptor_header *) &gs_control_interface_desc,
 602         (struct usb_descriptor_header *) &gs_header_desc,
 603         (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
 604         (struct usb_descriptor_header *) &gs_acm_descriptor,
 605         (struct usb_descriptor_header *) &gs_union_desc,
 606         (struct usb_descriptor_header *) &gs_highspeed_notify_desc,
 607         (struct usb_descriptor_header *) &gs_data_interface_desc,
 608         (struct usb_descriptor_header *) &gs_highspeed_in_desc,
 609         (struct usb_descriptor_header *) &gs_highspeed_out_desc,
 610         NULL,
 611 };
 612
 613 #endif /* CONFIG_USB_GADGET_DUALSPEED */
 614
 615
 616 /* Module */
 617 MODULE_DESCRIPTION(GS_LONG_NAME);
 618 MODULE_AUTHOR("Al Borchers");
 619 MODULE_LICENSE("GPL");
 620
 621 #ifdef GS_DEBUG
 622 module_param(debug, int, S_IRUGO|S_IWUSR);
 623 MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
 624 #endif
 625
 626 module_param(read_q_size, uint, S_IRUGO);
 627 MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
 628
 629 module_param(write_q_size, uint, S_IRUGO);
 630 MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
 631
 632 module_param(write_buf_size, uint, S_IRUGO);
 633 MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
 634
 635 module_param(use_acm, uint, S_IRUGO);
 636 MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
 637
 638 module_init(gs_module_init);
 639 module_exit(gs_module_exit);
 640
 641 /*
 642 *  gs_module_init
 643 *
 644 *  Register as a USB gadget driver and a tty driver.
 645 */
 646 static int __init gs_module_init(void)
 647 {
 648         int i;
 649         int retval;
 650
 651         retval = usb_gadget_register_driver(&gs_gadget_driver);
 652         if (retval) {
 653                 printk(KERN_ERR "gs_module_init: cannot register gadget driver, ret=%d\n", retval);
 654                 return retval;
 655         }
 656
 657         gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
 658         if (!gs_tty_driver)
 659                 return -ENOMEM;
 660         gs_tty_driver->owner = THIS_MODULE;
 661         gs_tty_driver->driver_name = GS_SHORT_NAME;
 662         gs_tty_driver->name = "ttygs";
 663         gs_tty_driver->devfs_name = "usb/ttygs/";
 664         gs_tty_driver->major = GS_MAJOR;
 665         gs_tty_driver->minor_start = GS_MINOR_START;
 666         gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
 667         gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
 668         gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
 669         gs_tty_driver->init_termios = tty_std_termios;
 670         gs_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 671         tty_set_operations(gs_tty_driver, &gs_tty_ops);
 672
 673         for (i=0; i < GS_NUM_PORTS; i++)
 674                 sema_init(&gs_open_close_sem[i], 1);
 675
 676         retval = tty_register_driver(gs_tty_driver);
 677         if (retval) {
 678                 usb_gadget_unregister_driver(&gs_gadget_driver);
 679                 put_tty_driver(gs_tty_driver);
 680                 printk(KERN_ERR "gs_module_init: cannot register tty driver, ret=%d\n", retval);
 681                 return retval;
 682         }
 683
 684         printk(KERN_INFO "gs_module_init: %s %s loaded\n", GS_LONG_NAME, GS_VERSION_STR);
 685         return 0;
 686 }
 687
 688 /*
 689 * gs_module_exit
 690 *
 691 * Unregister as a tty driver and a USB gadget driver.
 692 */
 693 static void __exit gs_module_exit(void)
 694 {
 695         tty_unregister_driver(gs_tty_driver);
 696         put_tty_driver(gs_tty_driver);
 697         usb_gadget_unregister_driver(&gs_gadget_driver);
 698
 699         printk(KERN_INFO "gs_module_exit: %s %s unloaded\n", GS_LONG_NAME, GS_VERSION_STR);
 700 }
 701
 702 /* TTY Driver */
 703
 704 /*
 705  * gs_open
 706  */
 707 static int gs_open(struct tty_struct *tty, struct file *file)
 708 {
 709         int port_num;
 710         unsigned long flags;
 711         struct gs_port *port;
 712         struct gs_dev *dev;
 713         struct gs_buf *buf;
 714         struct semaphore *sem;
 715         int ret;
 716
 717         port_num = tty->index;
 718
 719         gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
 720
 721         if (port_num < 0 || port_num >= GS_NUM_PORTS) {
 722                 printk(KERN_ERR "gs_open: (%d,%p,%p) invalid port number\n",
 723                         port_num, tty, file);
 724                 return -ENODEV;
 725         }
 726
 727         dev = gs_device;
 728
 729         if (dev == NULL) {
 730                 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL device pointer\n",
 731                         port_num, tty, file);
 732                 return -ENODEV;
 733         }
 734
 735         sem = &gs_open_close_sem[port_num];
 736         if (down_interruptible(sem)) {
 737                 printk(KERN_ERR
 738                 "gs_open: (%d,%p,%p) interrupted waiting for semaphore\n",
 739                         port_num, tty, file);
 740                 return -ERESTARTSYS;
 741         }
 742
 743         spin_lock_irqsave(&dev->dev_lock, flags);
 744
 745         if (dev->dev_config == GS_NO_CONFIG_ID) {
 746                 printk(KERN_ERR
 747                         "gs_open: (%d,%p,%p) device is not connected\n",
 748                         port_num, tty, file);
 749                 ret = -ENODEV;
 750                 goto exit_unlock_dev;
 751         }
 752
 753         port = dev->dev_port[port_num];
 754
 755         if (port == NULL) {
 756                 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL port pointer\n",
 757                         port_num, tty, file);
 758                 ret = -ENODEV;
 759                 goto exit_unlock_dev;
 760         }
 761
 762         spin_lock(&port->port_lock);
 763         spin_unlock(&dev->dev_lock);
 764
 765         if (port->port_dev == NULL) {
 766                 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (1)\n",
 767                         port_num, tty, file);
 768                 ret = -EIO;
 769                 goto exit_unlock_port;
 770         }
 771
 772         if (port->port_open_count > 0) {
 773                 ++port->port_open_count;
 774                 gs_debug("gs_open: (%d,%p,%p) already open\n",
 775                         port_num, tty, file);
 776                 ret = 0;
 777                 goto exit_unlock_port;
 778         }
 779
 780         tty->driver_data = NULL;
 781
 782         /* mark port as in use, we can drop port lock and sleep if necessary */
 783         port->port_in_use = 1;
 784
 785         /* allocate write buffer on first open */
 786         if (port->port_write_buf == NULL) {
 787                 spin_unlock_irqrestore(&port->port_lock, flags);
 788                 buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
 789                 spin_lock_irqsave(&port->port_lock, flags);
 790
 791                 /* might have been disconnected while asleep, check */
 792                 if (port->port_dev == NULL) {
 793                         printk(KERN_ERR
 794                                 "gs_open: (%d,%p,%p) port disconnected (2)\n",
 795                                 port_num, tty, file);
 796                         port->port_in_use = 0;
 797                         ret = -EIO;
 798                         goto exit_unlock_port;
 799                 }
 800
 801                 if ((port->port_write_buf=buf) == NULL) {
 802                         printk(KERN_ERR "gs_open: (%d,%p,%p) cannot allocate port write buffer\n",
 803                                 port_num, tty, file);
 804                         port->port_in_use = 0;
 805                         ret = -ENOMEM;
 806                         goto exit_unlock_port;
 807                 }
 808
 809         }
 810
 811         /* wait for carrier detect (not implemented) */
 812
 813         /* might have been disconnected while asleep, check */
 814         if (port->port_dev == NULL) {
 815                 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (3)\n",
 816                         port_num, tty, file);
 817                 port->port_in_use = 0;
 818                 ret = -EIO;
 819                 goto exit_unlock_port;
 820         }
 821
 822         tty->driver_data = port;
 823         port->port_tty = tty;
 824         port->port_open_count = 1;
 825         port->port_in_use = 0;
 826
 827         gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
 828
 829         ret = 0;
 830
 831 exit_unlock_port:
 832         spin_unlock_irqrestore(&port->port_lock, flags);
 833         up(sem);
 834         return ret;
 835
 836 exit_unlock_dev:
 837         spin_unlock_irqrestore(&dev->dev_lock, flags);
 838         up(sem);
 839         return ret;
 840
 841 }
 842
 843 /*
 844  * gs_close
 845  */
 846 static void gs_close(struct tty_struct *tty, struct file *file)
 847 {
 848         unsigned long flags;
 849         struct gs_port *port = tty->driver_data;
 850         struct semaphore *sem;
 851
 852         if (port == NULL) {
 853                 printk(KERN_ERR "gs_close: NULL port pointer\n");
 854                 return;
 855         }
 856
 857         gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
 858
 859         sem = &gs_open_close_sem[port->port_num];
 860         down(sem);
 861
 862         spin_lock_irqsave(&port->port_lock, flags);
 863
 864         if (port->port_open_count == 0) {
 865                 printk(KERN_ERR
 866                         "gs_close: (%d,%p,%p) port is already closed\n",
 867                         port->port_num, tty, file);
 868                 goto exit;
 869         }
 870
 871         if (port->port_open_count > 1) {
 872                 --port->port_open_count;
 873                 goto exit;
 874         }
 875
 876         /* free disconnected port on final close */
 877         if (port->port_dev == NULL) {
 878                 kfree(port);
 879                 goto exit;
 880         }
 881
 882         /* mark port as closed but in use, we can drop port lock */
 883         /* and sleep if necessary */
 884         port->port_in_use = 1;
 885         port->port_open_count = 0;
 886
 887         /* wait for write buffer to drain, or */
 888         /* at most GS_CLOSE_TIMEOUT seconds */
 889         if (gs_buf_data_avail(port->port_write_buf) > 0) {
 890                 spin_unlock_irqrestore(&port->port_lock, flags);
 891                 wait_cond_interruptible_timeout(port->port_write_wait,
 892                 port->port_dev == NULL
 893                 || gs_buf_data_avail(port->port_write_buf) == 0,
 894                 &port->port_lock, flags, GS_CLOSE_TIMEOUT * HZ);
 895                 spin_lock_irqsave(&port->port_lock, flags);
 896         }
 897
 898         /* free disconnected port on final close */
 899         /* (might have happened during the above sleep) */
 900         if (port->port_dev == NULL) {
 901                 kfree(port);
 902                 goto exit;
 903         }
 904
 905         gs_buf_clear(port->port_write_buf);
 906
 907         tty->driver_data = NULL;
 908         port->port_tty = NULL;
 909         port->port_in_use = 0;
 910
 911         gs_debug("gs_close: (%d,%p,%p) completed\n",
 912                 port->port_num, tty, file);
 913
 914 exit:
 915         spin_unlock_irqrestore(&port->port_lock, flags);
 916         up(sem);
 917 }
 918
 919 /*
 920  * gs_write
 921  */
 922 static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
 923 {
 924         unsigned long flags;
 925         struct gs_port *port = tty->driver_data;
 926         int ret;
 927
 928         if (port == NULL) {
 929                 printk(KERN_ERR "gs_write: NULL port pointer\n");
 930                 return -EIO;
 931         }
 932
 933         gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
 934                 count);
 935
 936         if (count == 0)
 937                 return 0;
 938
 939         spin_lock_irqsave(&port->port_lock, flags);
 940
 941         if (port->port_dev == NULL) {
 942                 printk(KERN_ERR "gs_write: (%d,%p) port is not connected\n",
 943                         port->port_num, tty);
 944                 ret = -EIO;
 945                 goto exit;
 946         }
 947
 948         if (port->port_open_count == 0) {
 949                 printk(KERN_ERR "gs_write: (%d,%p) port is closed\n",
 950                         port->port_num, tty);
 951                 ret = -EBADF;
 952                 goto exit;
 953         }
 954
 955         count = gs_buf_put(port->port_write_buf, buf, count);
 956
 957         spin_unlock_irqrestore(&port->port_lock, flags);
 958
 959         gs_send(gs_device);
 960
 961         gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
 962                 count);
 963
 964         return count;
 965
 966 exit:
 967         spin_unlock_irqrestore(&port->port_lock, flags);
 968         return ret;
 969 }
 970
 971 /*
 972  * gs_put_char
 973  */
 974 static void gs_put_char(struct tty_struct *tty, unsigned char ch)
 975 {
 976         unsigned long flags;
 977         struct gs_port *port = tty->driver_data;
 978
 979         if (port == NULL) {
 980                 printk(KERN_ERR "gs_put_char: NULL port pointer\n");
 981                 return;
 982         }
 983
 984         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));
 985
 986         spin_lock_irqsave(&port->port_lock, flags);
 987
 988         if (port->port_dev == NULL) {
 989                 printk(KERN_ERR "gs_put_char: (%d,%p) port is not connected\n",
 990                         port->port_num, tty);
 991                 goto exit;
 992         }
 993
 994         if (port->port_open_count == 0) {
 995                 printk(KERN_ERR "gs_put_char: (%d,%p) port is closed\n",
 996                         port->port_num, tty);
 997                 goto exit;
 998         }
 999
1000         gs_buf_put(port->port_write_buf, &ch, 1);
1001
1002 exit:
1003         spin_unlock_irqrestore(&port->port_lock, flags);
1004 }
1005
1006 /*
1007  * gs_flush_chars
1008  */
1009 static void gs_flush_chars(struct tty_struct *tty)
1010 {
1011         unsigned long flags;
1012         struct gs_port *port = tty->driver_data;
1013
1014         if (port == NULL) {
1015                 printk(KERN_ERR "gs_flush_chars: NULL port pointer\n");
1016                 return;
1017         }
1018
1019         gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
1020
1021         spin_lock_irqsave(&port->port_lock, flags);
1022
1023         if (port->port_dev == NULL) {
1024                 printk(KERN_ERR
1025                         "gs_flush_chars: (%d,%p) port is not connected\n",
1026                         port->port_num, tty);
1027                 goto exit;
1028         }
1029
1030         if (port->port_open_count == 0) {
1031                 printk(KERN_ERR "gs_flush_chars: (%d,%p) port is closed\n",
1032                         port->port_num, tty);
1033                 goto exit;
1034         }
1035
1036         spin_unlock_irqrestore(&port->port_lock, flags);
1037
1038         gs_send(gs_device);
1039
1040         return;
1041
1042 exit:
1043         spin_unlock_irqrestore(&port->port_lock, flags);
1044 }
1045
1046 /*
1047  * gs_write_room
1048  */
1049 static int gs_write_room(struct tty_struct *tty)
1050 {
1051
1052         int room = 0;
1053         unsigned long flags;
1054         struct gs_port *port = tty->driver_data;
1055
1056
1057         if (port == NULL)
1058                 return 0;
1059
1060         spin_lock_irqsave(&port->port_lock, flags);
1061
1062         if (port->port_dev != NULL && port->port_open_count > 0
1063         && port->port_write_buf != NULL)
1064                 room = gs_buf_space_avail(port->port_write_buf);
1065
1066         spin_unlock_irqrestore(&port->port_lock, flags);
1067
1068         gs_debug("gs_write_room: (%d,%p) room=%d\n",
1069                 port->port_num, tty, room);
1070
1071         return room;
1072 }
1073
1074 /*
1075  * gs_chars_in_buffer
1076  */
1077 static int gs_chars_in_buffer(struct tty_struct *tty)
1078 {
1079         int chars = 0;
1080         unsigned long flags;
1081         struct gs_port *port = tty->driver_data;
1082
1083         if (port == NULL)
1084                 return 0;
1085
1086         spin_lock_irqsave(&port->port_lock, flags);
1087
1088         if (port->port_dev != NULL && port->port_open_count > 0
1089         && port->port_write_buf != NULL)
1090                 chars = gs_buf_data_avail(port->port_write_buf);
1091
1092         spin_unlock_irqrestore(&port->port_lock, flags);
1093
1094         gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
1095                 port->port_num, tty, chars);
1096
1097         return chars;
1098 }
1099
1100 /*
1101  * gs_throttle
1102  */
1103 static void gs_throttle(struct tty_struct *tty)
1104 {
1105 }
1106
1107 /*
1108  * gs_unthrottle
1109  */
1110 static void gs_unthrottle(struct tty_struct *tty)
1111 {
1112 }
1113
1114 /*
1115  * gs_break
1116  */
1117 static void gs_break(struct tty_struct *tty, int break_state)
1118 {
1119 }
1120
1121 /*
1122  * gs_ioctl
1123  */
1124 static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1125 {
1126         struct gs_port *port = tty->driver_data;
1127
1128         if (port == NULL) {
1129                 printk(KERN_ERR "gs_ioctl: NULL port pointer\n");
1130                 return -EIO;
1131         }
1132
1133         gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
1134                 port->port_num, tty, file, cmd, arg);
1135
1136         /* handle ioctls */
1137
1138         /* could not handle ioctl */
1139         return -ENOIOCTLCMD;
1140 }
1141
1142 /*
1143  * gs_set_termios
1144  */
1145 static void gs_set_termios(struct tty_struct *tty, struct termios *old)
1146 {
1147 }
1148
1149 /*
1150 * gs_send
1151 *
1152 * This function finds available write requests, calls
1153 * gs_send_packet to fill these packets with data, and
1154 * continues until either there are no more write requests
1155 * available or no more data to send.  This function is
1156 * run whenever data arrives or write requests are available.
1157 */
1158 static int gs_send(struct gs_dev *dev)
1159 {
1160         int ret,len;
1161         unsigned long flags;
1162         struct usb_ep *ep;
1163         struct usb_request *req;
1164         struct gs_req_entry *req_entry;
1165
1166         if (dev == NULL) {
1167                 printk(KERN_ERR "gs_send: NULL device pointer\n");
1168                 return -ENODEV;
1169         }
1170
1171         spin_lock_irqsave(&dev->dev_lock, flags);
1172
1173         ep = dev->dev_in_ep;
1174
1175         while(!list_empty(&dev->dev_req_list)) {
1176
1177                 req_entry = list_entry(dev->dev_req_list.next,
1178                         struct gs_req_entry, re_entry);
1179
1180                 req = req_entry->re_req;
1181
1182                 len = gs_send_packet(dev, req->buf, ep->maxpacket);
1183
1184                 if (len > 0) {
1185 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));
1186                         list_del(&req_entry->re_entry);
1187                         req->length = len;
1188                         if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1189                                 printk(KERN_ERR
1190                                 "gs_send: cannot queue read request, ret=%d\n",
1191                                         ret);
1192                                 break;
1193                         }
1194                 } else {
1195                         break;
1196                 }
1197
1198         }
1199
1200         spin_unlock_irqrestore(&dev->dev_lock, flags);
1201
1202         return 0;
1203 }
1204
1205 /*
1206  * gs_send_packet
1207  *
1208  * If there is data to send, a packet is built in the given
1209  * buffer and the size is returned.  If there is no data to
1210  * send, 0 is returned.  If there is any error a negative
1211  * error number is returned.
1212  *
1213  * Called during USB completion routine, on interrupt time.
1214  *
1215  * We assume that disconnect will not happen until all completion
1216  * routines have completed, so we can assume that the dev_port
1217  * array does not change during the lifetime of this function.
1218  */
1219 static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
1220 {
1221         unsigned int len;
1222         struct gs_port *port;
1223
1224         /* TEMPORARY -- only port 0 is supported right now */
1225         port = dev->dev_port[0];
1226
1227         if (port == NULL) {
1228                 printk(KERN_ERR
1229                         "gs_send_packet: port=%d, NULL port pointer\n",
1230                         0);
1231                 return -EIO;
1232         }
1233
1234         spin_lock(&port->port_lock);
1235
1236         len = gs_buf_data_avail(port->port_write_buf);
1237         if (len < size)
1238                 size = len;
1239
1240         if (size == 0)
1241                 goto exit;
1242
1243         size = gs_buf_get(port->port_write_buf, packet, size);
1244
1245         if (port->port_tty)
1246                 wake_up_interruptible(&port->port_tty->write_wait);
1247
1248 exit:
1249         spin_unlock(&port->port_lock);
1250         return size;
1251 }
1252
1253 /*
1254  * gs_recv_packet
1255  *
1256  * Called for each USB packet received.  Reads the packet
1257  * header and stuffs the data in the appropriate tty buffer.
1258  * Returns 0 if successful, or a negative error number.
1259  *
1260  * Called during USB completion routine, on interrupt time.
1261  *
1262  * We assume that disconnect will not happen until all completion
1263  * routines have completed, so we can assume that the dev_port
1264  * array does not change during the lifetime of this function.
1265  */
1266 static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
1267 {
1268         unsigned int len;
1269         struct gs_port *port;
1270         int ret;
1271         struct tty_struct *tty;
1272
1273         /* TEMPORARY -- only port 0 is supported right now */
1274         port = dev->dev_port[0];
1275
1276         if (port == NULL) {
1277                 printk(KERN_ERR "gs_recv_packet: port=%d, NULL port pointer\n",
1278                         port->port_num);
1279                 return -EIO;
1280         }
1281
1282         spin_lock(&port->port_lock);
1283
1284         if (port->port_open_count == 0) {
1285                 printk(KERN_ERR "gs_recv_packet: port=%d, port is closed\n",
1286                         port->port_num);
1287                 ret = -EIO;
1288                 goto exit;
1289         }
1290
1291
1292         tty = port->port_tty;
1293
1294         if (tty == NULL) {
1295                 printk(KERN_ERR "gs_recv_packet: port=%d, NULL tty pointer\n",
1296                         port->port_num);
1297                 ret = -EIO;
1298                 goto exit;
1299         }
1300
1301         if (port->port_tty->magic != TTY_MAGIC) {
1302                 printk(KERN_ERR "gs_recv_packet: port=%d, bad tty magic\n",
1303                         port->port_num);
1304                 ret = -EIO;
1305                 goto exit;
1306         }
1307
1308         len = tty_buffer_request_room(tty, size);
1309         if (len > 0) {
1310                 tty_insert_flip_string(tty, packet, len);
1311                 tty_flip_buffer_push(port->port_tty);
1312                 wake_up_interruptible(&port->port_tty->read_wait);
1313         }
1314         ret = 0;
1315 exit:
1316         spin_unlock(&port->port_lock);
1317         return ret;
1318 }
1319
1320 /*
1321 * gs_read_complete
1322 */
1323 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
1324 {
1325         int ret;
1326         struct gs_dev *dev = ep->driver_data;
1327
1328         if (dev == NULL) {
1329                 printk(KERN_ERR "gs_read_complete: NULL device pointer\n");
1330                 return;
1331         }
1332
1333         switch(req->status) {
1334         case 0:
1335                 /* normal completion */
1336                 gs_recv_packet(dev, req->buf, req->actual);
1337 requeue:
1338                 req->length = ep->maxpacket;
1339                 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1340                         printk(KERN_ERR
1341                         "gs_read_complete: cannot queue read request, ret=%d\n",
1342                                 ret);
1343                 }
1344                 break;
1345
1346         case -ESHUTDOWN:
1347                 /* disconnect */
1348                 gs_debug("gs_read_complete: shutdown\n");
1349                 gs_free_req(ep, req);
1350                 break;
1351
1352         default:
1353                 /* unexpected */
1354                 printk(KERN_ERR
1355                 "gs_read_complete: unexpected status error, status=%d\n",
1356                         req->status);
1357                 goto requeue;
1358                 break;
1359         }
1360 }
1361
1362 /*
1363 * gs_write_complete
1364 */
1365 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
1366 {
1367         struct gs_dev *dev = ep->driver_data;
1368         struct gs_req_entry *gs_req = req->context;
1369
1370         if (dev == NULL) {
1371                 printk(KERN_ERR "gs_write_complete: NULL device pointer\n");
1372                 return;
1373         }
1374
1375         switch(req->status) {
1376         case 0:
1377                 /* normal completion */
1378 requeue:
1379                 if (gs_req == NULL) {
1380                         printk(KERN_ERR
1381                                 "gs_write_complete: NULL request pointer\n");
1382                         return;
1383                 }
1384
1385                 spin_lock(&dev->dev_lock);
1386                 list_add(&gs_req->re_entry, &dev->dev_req_list);
1387                 spin_unlock(&dev->dev_lock);
1388
1389                 gs_send(dev);
1390
1391                 break;
1392
1393         case -ESHUTDOWN:
1394                 /* disconnect */
1395                 gs_debug("gs_write_complete: shutdown\n");
1396                 gs_free_req(ep, req);
1397                 break;
1398
1399         default:
1400                 printk(KERN_ERR
1401                 "gs_write_complete: unexpected status error, status=%d\n",
1402                         req->status);
1403                 goto requeue;
1404                 break;
1405         }
1406 }
1407
1408 /* Gadget Driver */
1409
1410 /*
1411  * gs_bind
1412  *
1413  * Called on module load.  Allocates and initializes the device
1414  * structure and a control request.
1415  */
1416 static int __init gs_bind(struct usb_gadget *gadget)
1417 {
1418         int ret;
1419         struct usb_ep *ep;
1420         struct gs_dev *dev;
1421         int gcnum;
1422
1423         /* Some controllers can't support CDC ACM:
1424          * - sh doesn't support multiple interfaces or configs;
1425          * - sa1100 doesn't have a third interrupt endpoint
1426          */
1427         if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget))
1428                 use_acm = 0;
1429
1430         gcnum = usb_gadget_controller_number(gadget);
1431         if (gcnum >= 0)
1432                 gs_device_desc.bcdDevice =
1433                                 cpu_to_le16(GS_VERSION_NUM | gcnum);
1434         else {
1435                 printk(KERN_WARNING "gs_bind: controller '%s' not recognized\n",
1436                         gadget->name);
1437                 /* unrecognized, but safe unless bulk is REALLY quirky */
1438                 gs_device_desc.bcdDevice =
1439                         __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
1440         }
1441
1442         usb_ep_autoconfig_reset(gadget);
1443
1444         ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
1445         if (!ep)
1446                 goto autoconf_fail;
1447         EP_IN_NAME = ep->name;
1448         ep->driver_data = ep;   /* claim the endpoint */
1449
1450         ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
1451         if (!ep)
1452                 goto autoconf_fail;
1453         EP_OUT_NAME = ep->name;
1454         ep->driver_data = ep;   /* claim the endpoint */
1455
1456         if (use_acm) {
1457                 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
1458                 if (!ep) {
1459                         printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
1460                         goto autoconf_fail;
1461                 }
1462                 gs_device_desc.idProduct = __constant_cpu_to_le16(
1463                                                 GS_CDC_PRODUCT_ID),
1464                 EP_NOTIFY_NAME = ep->name;
1465                 ep->driver_data = ep;   /* claim the endpoint */
1466         }
1467
1468         gs_device_desc.bDeviceClass = use_acm
1469                 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1470         gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1471
1472 #ifdef CONFIG_USB_GADGET_DUALSPEED
1473         gs_qualifier_desc.bDeviceClass = use_acm
1474                 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1475         /* assume ep0 uses the same packet size for both speeds */
1476         gs_qualifier_desc.bMaxPacketSize0 = gs_device_desc.bMaxPacketSize0;
1477         /* assume endpoints are dual-speed */
1478         gs_highspeed_notify_desc.bEndpointAddress =
1479                 gs_fullspeed_notify_desc.bEndpointAddress;
1480         gs_highspeed_in_desc.bEndpointAddress =
1481                 gs_fullspeed_in_desc.bEndpointAddress;
1482         gs_highspeed_out_desc.bEndpointAddress =
1483                 gs_fullspeed_out_desc.bEndpointAddress;
1484 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1485
1486         usb_gadget_set_selfpowered(gadget);
1487
1488         if (gadget->is_otg) {
1489                 gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
1490                 gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1491                 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1492         }
1493
1494         gs_device = dev = kmalloc(sizeof(struct gs_dev), GFP_KERNEL);
1495         if (dev == NULL)
1496                 return -ENOMEM;
1497
1498         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1499                 system_utsname.sysname, system_utsname.release,
1500                 gadget->name);
1501
1502         memset(dev, 0, sizeof(struct gs_dev));
1503         dev->dev_gadget = gadget;
1504         spin_lock_init(&dev->dev_lock);
1505         INIT_LIST_HEAD(&dev->dev_req_list);
1506         set_gadget_data(gadget, dev);
1507
1508         if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
1509                 printk(KERN_ERR "gs_bind: cannot allocate ports\n");
1510                 gs_unbind(gadget);
1511                 return ret;
1512         }
1513
1514         /* preallocate control response and buffer */
1515         dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
1516                 GFP_KERNEL);
1517         if (dev->dev_ctrl_req == NULL) {
1518                 gs_unbind(gadget);
1519                 return -ENOMEM;
1520         }
1521         dev->dev_ctrl_req->complete = gs_setup_complete;
1522
1523         gadget->ep0->driver_data = dev;
1524
1525         printk(KERN_INFO "gs_bind: %s %s bound\n",
1526                 GS_LONG_NAME, GS_VERSION_STR);
1527
1528         return 0;
1529
1530 autoconf_fail:
1531         printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
1532         return -ENODEV;
1533 }
1534
1535 /*
1536  * gs_unbind
1537  *
1538  * Called on module unload.  Frees the control request and device
1539  * structure.
1540  */
1541 static void __exit gs_unbind(struct usb_gadget *gadget)
1542 {
1543         struct gs_dev *dev = get_gadget_data(gadget);
1544
1545         gs_device = NULL;
1546
1547         /* read/write requests already freed, only control request remains */
1548         if (dev != NULL) {
1549                 if (dev->dev_ctrl_req != NULL) {
1550                         gs_free_req(gadget->ep0, dev->dev_ctrl_req);
1551                         dev->dev_ctrl_req = NULL;
1552                 }
1553                 gs_free_ports(dev);
1554                 kfree(dev);
1555                 set_gadget_data(gadget, NULL);
1556         }
1557
1558         printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
1559                 GS_VERSION_STR);
1560 }
1561
1562 /*
1563  * gs_setup
1564  *
1565  * Implements all the control endpoint functionality that's not
1566  * handled in hardware or the hardware driver.
1567  *
1568  * Returns the size of the data sent to the host, or a negative
1569  * error number.
1570  */
1571 static int gs_setup(struct usb_gadget *gadget,
1572         const struct usb_ctrlrequest *ctrl)
1573 {
1574         int ret = -EOPNOTSUPP;
1575         struct gs_dev *dev = get_gadget_data(gadget);
1576         struct usb_request *req = dev->dev_ctrl_req;
1577         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1578         u16 wValue = le16_to_cpu(ctrl->wValue);
1579         u16 wLength = le16_to_cpu(ctrl->wLength);
1580
1581         switch (ctrl->bRequestType & USB_TYPE_MASK) {
1582         case USB_TYPE_STANDARD:
1583                 ret = gs_setup_standard(gadget,ctrl);
1584                 break;
1585
1586         case USB_TYPE_CLASS:
1587                 ret = gs_setup_class(gadget,ctrl);
1588                 break;
1589
1590         default:
1591                 printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1592                         ctrl->bRequestType, ctrl->bRequest,
1593                         wValue, wIndex, wLength);
1594                 break;
1595         }
1596
1597         /* respond with data transfer before status phase? */
1598         if (ret >= 0) {
1599                 req->length = ret;
1600                 req->zero = ret < wLength
1601                                 && (ret % gadget->ep0->maxpacket) == 0;
1602                 ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1603                 if (ret < 0) {
1604                         printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
1605                                 ret);
1606                         req->status = 0;
1607                         gs_setup_complete(gadget->ep0, req);
1608                 }
1609         }
1610
1611         /* device either stalls (ret < 0) or reports success */
1612         return ret;
1613 }
1614
1615 static int gs_setup_standard(struct usb_gadget *gadget,
1616         const struct usb_ctrlrequest *ctrl)
1617 {
1618         int ret = -EOPNOTSUPP;
1619         struct gs_dev *dev = get_gadget_data(gadget);
1620         struct usb_request *req = dev->dev_ctrl_req;
1621         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1622         u16 wValue = le16_to_cpu(ctrl->wValue);
1623         u16 wLength = le16_to_cpu(ctrl->wLength);
1624
1625         switch (ctrl->bRequest) {
1626         case USB_REQ_GET_DESCRIPTOR:
1627                 if (ctrl->bRequestType != USB_DIR_IN)
1628                         break;
1629
1630                 switch (wValue >> 8) {
1631                 case USB_DT_DEVICE:
1632                         ret = min(wLength,
1633                                 (u16)sizeof(struct usb_device_descriptor));
1634                         memcpy(req->buf, &gs_device_desc, ret);
1635                         break;
1636
1637 #ifdef CONFIG_USB_GADGET_DUALSPEED
1638                 case USB_DT_DEVICE_QUALIFIER:
1639                         if (!gadget->is_dualspeed)
1640                                 break;
1641                         ret = min(wLength,
1642                                 (u16)sizeof(struct usb_qualifier_descriptor));
1643                         memcpy(req->buf, &gs_qualifier_desc, ret);
1644                         break;
1645
1646                 case USB_DT_OTHER_SPEED_CONFIG:
1647                         if (!gadget->is_dualspeed)
1648                                 break;
1649                         /* fall through */
1650 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1651                 case USB_DT_CONFIG:
1652                         ret = gs_build_config_buf(req->buf, gadget->speed,
1653                                 wValue >> 8, wValue & 0xff,
1654                                 gadget->is_otg);
1655                         if (ret >= 0)
1656                                 ret = min(wLength, (u16)ret);
1657                         break;
1658
1659                 case USB_DT_STRING:
1660                         /* wIndex == language code. */
1661                         ret = usb_gadget_get_string(&gs_string_table,
1662                                 wValue & 0xff, req->buf);
1663                         if (ret >= 0)
1664                                 ret = min(wLength, (u16)ret);
1665                         break;
1666                 }
1667                 break;
1668
1669         case USB_REQ_SET_CONFIGURATION:
1670                 if (ctrl->bRequestType != 0)
1671                         break;
1672                 spin_lock(&dev->dev_lock);
1673                 ret = gs_set_config(dev, wValue);
1674                 spin_unlock(&dev->dev_lock);
1675                 break;
1676
1677         case USB_REQ_GET_CONFIGURATION:
1678                 if (ctrl->bRequestType != USB_DIR_IN)
1679                         break;
1680                 *(u8 *)req->buf = dev->dev_config;
1681                 ret = min(wLength, (u16)1);
1682                 break;
1683
1684         case USB_REQ_SET_INTERFACE:
1685                 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1686                                 || !dev->dev_config
1687                                 || wIndex >= GS_MAX_NUM_INTERFACES)
1688                         break;
1689                 if (dev->dev_config == GS_BULK_CONFIG_ID
1690                                 && wIndex != GS_BULK_INTERFACE_ID)
1691                         break;
1692                 /* no alternate interface settings */
1693                 if (wValue != 0)
1694                         break;
1695                 spin_lock(&dev->dev_lock);
1696                 /* PXA hardware partially handles SET_INTERFACE;
1697                  * we need to kluge around that interference.  */
1698                 if (gadget_is_pxa(gadget)) {
1699                         ret = gs_set_config(dev, use_acm ?
1700                                 GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
1701                         goto set_interface_done;
1702                 }
1703                 if (dev->dev_config != GS_BULK_CONFIG_ID
1704                                 && wIndex == GS_CONTROL_INTERFACE_ID) {
1705                         if (dev->dev_notify_ep) {
1706                                 usb_ep_disable(dev->dev_notify_ep);
1707                                 usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
1708                         }
1709                 } else {
1710                         usb_ep_disable(dev->dev_in_ep);
1711                         usb_ep_disable(dev->dev_out_ep);
1712                         usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
1713                         usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
1714                 }
1715                 ret = 0;
1716 set_interface_done:
1717                 spin_unlock(&dev->dev_lock);
1718                 break;
1719
1720         case USB_REQ_GET_INTERFACE:
1721                 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1722                 || dev->dev_config == GS_NO_CONFIG_ID)
1723                         break;
1724                 if (wIndex >= GS_MAX_NUM_INTERFACES
1725                                 || (dev->dev_config == GS_BULK_CONFIG_ID
1726                                 && wIndex != GS_BULK_INTERFACE_ID)) {
1727                         ret = -EDOM;
1728                         break;
1729                 }
1730                 /* no alternate interface settings */
1731                 *(u8 *)req->buf = 0;
1732                 ret = min(wLength, (u16)1);
1733                 break;
1734
1735         default:
1736                 printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1737                         ctrl->bRequestType, ctrl->bRequest,
1738                         wValue, wIndex, wLength);
1739                 break;
1740         }
1741
1742         return ret;
1743 }
1744
1745 static int gs_setup_class(struct usb_gadget *gadget,
1746         const struct usb_ctrlrequest *ctrl)
1747 {
1748         int ret = -EOPNOTSUPP;
1749         struct gs_dev *dev = get_gadget_data(gadget);
1750         struct gs_port *port = dev->dev_port[0];        /* ACM only has one port */
1751         struct usb_request *req = dev->dev_ctrl_req;
1752         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1753         u16 wValue = le16_to_cpu(ctrl->wValue);
1754         u16 wLength = le16_to_cpu(ctrl->wLength);
1755
1756         switch (ctrl->bRequest) {
1757         case USB_CDC_REQ_SET_LINE_CODING:
1758                 ret = min(wLength,
1759                         (u16)sizeof(struct usb_cdc_line_coding));
1760                 if (port) {
1761                         spin_lock(&port->port_lock);
1762                         memcpy(&port->port_line_coding, req->buf, ret);
1763                         spin_unlock(&port->port_lock);
1764                 }
1765                 break;
1766
1767         case USB_CDC_REQ_GET_LINE_CODING:
1768                 port = dev->dev_port[0];        /* ACM only has one port */
1769                 ret = min(wLength,
1770                         (u16)sizeof(struct usb_cdc_line_coding));
1771                 if (port) {
1772                         spin_lock(&port->port_lock);
1773                         memcpy(req->buf, &port->port_line_coding, ret);
1774                         spin_unlock(&port->port_lock);
1775                 }
1776                 break;
1777
1778         case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
1779                 ret = 0;
1780                 break;
1781
1782         default:
1783                 printk(KERN_ERR "gs_setup: unknown class request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1784                         ctrl->bRequestType, ctrl->bRequest,
1785                         wValue, wIndex, wLength);
1786                 break;
1787         }
1788
1789         return ret;
1790 }
1791
1792 /*
1793  * gs_setup_complete
1794  */
1795 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
1796 {
1797         if (req->status || req->actual != req->length) {
1798                 printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
1799                         req->status, req->actual, req->length);
1800         }
1801 }
1802
1803 /*
1804  * gs_disconnect
1805  *
1806  * Called when the device is disconnected.  Frees the closed
1807  * ports and disconnects open ports.  Open ports will be freed
1808  * on close.  Then reallocates the ports for the next connection.
1809  */
1810 static void gs_disconnect(struct usb_gadget *gadget)
1811 {
1812         unsigned long flags;
1813         struct gs_dev *dev = get_gadget_data(gadget);
1814
1815         spin_lock_irqsave(&dev->dev_lock, flags);
1816
1817         gs_reset_config(dev);
1818
1819         /* free closed ports and disconnect open ports */
1820         /* (open ports will be freed when closed) */
1821         gs_free_ports(dev);
1822
1823         /* re-allocate ports for the next connection */
1824         if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
1825                 printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
1826
1827         spin_unlock_irqrestore(&dev->dev_lock, flags);
1828
1829         printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
1830 }
1831
1832 /*
1833  * gs_set_config
1834  *
1835  * Configures the device by enabling device specific
1836  * optimizations, setting up the endpoints, allocating
1837  * read and write requests and queuing read requests.
1838  *
1839  * The device lock must be held when calling this function.
1840  */
1841 static int gs_set_config(struct gs_dev *dev, unsigned config)
1842 {
1843         int i;
1844         int ret = 0;
1845         struct usb_gadget *gadget = dev->dev_gadget;
1846         struct usb_ep *ep;
1847         struct usb_endpoint_descriptor *ep_desc;
1848         struct usb_request *req;
1849         struct gs_req_entry *req_entry;
1850
1851         if (dev == NULL) {
1852                 printk(KERN_ERR "gs_set_config: NULL device pointer\n");
1853                 return 0;
1854         }
1855
1856         if (config == dev->dev_config)
1857                 return 0;
1858
1859         gs_reset_config(dev);
1860
1861         switch (config) {
1862         case GS_NO_CONFIG_ID:
1863                 return 0;
1864         case GS_BULK_CONFIG_ID:
1865                 if (use_acm)
1866                         return -EINVAL;
1867                 /* device specific optimizations */
1868                 if (gadget_is_net2280(gadget))
1869                         net2280_set_fifo_mode(gadget, 1);
1870                 break;
1871         case GS_ACM_CONFIG_ID:
1872                 if (!use_acm)
1873                         return -EINVAL;
1874                 /* device specific optimizations */
1875                 if (gadget_is_net2280(gadget))
1876                         net2280_set_fifo_mode(gadget, 1);
1877                 break;
1878         default:
1879                 return -EINVAL;
1880         }
1881
1882         dev->dev_config = config;
1883
1884         gadget_for_each_ep(ep, gadget) {
1885
1886                 if (EP_NOTIFY_NAME
1887                 && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
1888                         ep_desc = GS_SPEED_SELECT(
1889                                 gadget->speed == USB_SPEED_HIGH,
1890                                 &gs_highspeed_notify_desc,
1891                                 &gs_fullspeed_notify_desc);
1892                         ret = usb_ep_enable(ep,ep_desc);
1893                         if (ret == 0) {
1894                                 ep->driver_data = dev;
1895                                 dev->dev_notify_ep = ep;
1896                                 dev->dev_notify_ep_desc = ep_desc;
1897                         } else {
1898                                 printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
1899                                         ep->name, ret);
1900                                 goto exit_reset_config;
1901                         }
1902                 }
1903
1904                 else if (strcmp(ep->name, EP_IN_NAME) == 0) {
1905                         ep_desc = GS_SPEED_SELECT(
1906                                 gadget->speed == USB_SPEED_HIGH,
1907                                 &gs_highspeed_in_desc,
1908                                 &gs_fullspeed_in_desc);
1909                         ret = usb_ep_enable(ep,ep_desc);
1910                         if (ret == 0) {
1911                                 ep->driver_data = dev;
1912                                 dev->dev_in_ep = ep;
1913                                 dev->dev_in_ep_desc = ep_desc;
1914                         } else {
1915                                 printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
1916                                         ep->name, ret);
1917                                 goto exit_reset_config;
1918                         }
1919                 }
1920
1921                 else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
1922                         ep_desc = GS_SPEED_SELECT(
1923                                 gadget->speed == USB_SPEED_HIGH,
1924                                 &gs_highspeed_out_desc,
1925                                 &gs_fullspeed_out_desc);
1926                         ret = usb_ep_enable(ep,ep_desc);
1927                         if (ret == 0) {
1928                                 ep->driver_data = dev;
1929                                 dev->dev_out_ep = ep;
1930                                 dev->dev_out_ep_desc = ep_desc;
1931                         } else {
1932                                 printk(KERN_ERR "gs_set_config: cannot enable out endpoint %s, ret=%d\n",
1933                                         ep->name, ret);
1934                                 goto exit_reset_config;
1935                         }
1936                 }
1937
1938         }
1939
1940         if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
1941         || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
1942                 printk(KERN_ERR "gs_set_config: cannot find endpoints\n");
1943                 ret = -ENODEV;
1944                 goto exit_reset_config;
1945         }
1946
1947         /* allocate and queue read requests */
1948         ep = dev->dev_out_ep;
1949         for (i=0; i<read_q_size && ret == 0; i++) {
1950                 if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
1951                         req->complete = gs_read_complete;
1952                         if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1953                                 printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
1954                                         ret);
1955                         }
1956                 } else {
1957                         printk(KERN_ERR "gs_set_config: cannot allocate read requests\n");
1958                         ret = -ENOMEM;
1959                         goto exit_reset_config;
1960                 }
1961         }
1962
1963         /* allocate write requests, and put on free list */
1964         ep = dev->dev_in_ep;
1965         for (i=0; i<write_q_size; i++) {
1966                 if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
1967                         req_entry->re_req->complete = gs_write_complete;
1968                         list_add(&req_entry->re_entry, &dev->dev_req_list);
1969                 } else {
1970                         printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
1971                         ret = -ENOMEM;
1972                         goto exit_reset_config;
1973                 }
1974         }
1975
1976         printk(KERN_INFO "gs_set_config: %s configured, %s speed %s config\n",
1977                 GS_LONG_NAME,
1978                 gadget->speed == USB_SPEED_HIGH ? "high" : "full",
1979                 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
1980
1981         return 0;
1982
1983 exit_reset_config:
1984         gs_reset_config(dev);
1985         return ret;
1986 }
1987
1988 /*
1989  * gs_reset_config
1990  *
1991  * Mark the device as not configured, disable all endpoints,
1992  * which forces completion of pending I/O and frees queued
1993  * requests, and free the remaining write requests on the
1994  * free list.
1995  *
1996  * The device lock must be held when calling this function.
1997  */
1998 static void gs_reset_config(struct gs_dev *dev)
1999 {
2000         struct gs_req_entry *req_entry;
2001
2002         if (dev == NULL) {
2003                 printk(KERN_ERR "gs_reset_config: NULL device pointer\n");
2004                 return;
2005         }
2006
2007         if (dev->dev_config == GS_NO_CONFIG_ID)
2008                 return;
2009
2010         dev->dev_config = GS_NO_CONFIG_ID;
2011
2012         /* free write requests on the free list */
2013         while(!list_empty(&dev->dev_req_list)) {
2014                 req_entry = list_entry(dev->dev_req_list.next,
2015                         struct gs_req_entry, re_entry);
2016                 list_del(&req_entry->re_entry);
2017                 gs_free_req_entry(dev->dev_in_ep, req_entry);
2018         }
2019
2020         /* disable endpoints, forcing completion of pending i/o; */
2021         /* completion handlers free their requests in this case */
2022         if (dev->dev_notify_ep) {
2023                 usb_ep_disable(dev->dev_notify_ep);
2024                 dev->dev_notify_ep = NULL;
2025         }
2026         if (dev->dev_in_ep) {
2027                 usb_ep_disable(dev->dev_in_ep);
2028                 dev->dev_in_ep = NULL;
2029         }
2030         if (dev->dev_out_ep) {
2031                 usb_ep_disable(dev->dev_out_ep);
2032                 dev->dev_out_ep = NULL;
2033         }
2034 }
2035
2036 /*
2037  * gs_build_config_buf
2038  *
2039  * Builds the config descriptors in the given buffer and returns the
2040  * length, or a negative error number.
2041  */
2042 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
2043         u8 type, unsigned int index, int is_otg)
2044 {
2045         int len;
2046         int high_speed;
2047         const struct usb_config_descriptor *config_desc;
2048         const struct usb_descriptor_header **function;
2049
2050         if (index >= gs_device_desc.bNumConfigurations)
2051                 return -EINVAL;
2052
2053         /* other speed switches high and full speed */
2054         high_speed = (speed == USB_SPEED_HIGH);
2055         if (type == USB_DT_OTHER_SPEED_CONFIG)
2056                 high_speed = !high_speed;
2057
2058         if (use_acm) {
2059                 config_desc = &gs_acm_config_desc;
2060                 function = GS_SPEED_SELECT(high_speed,
2061                         gs_acm_highspeed_function,
2062                         gs_acm_fullspeed_function);
2063         } else {
2064                 config_desc = &gs_bulk_config_desc;
2065                 function = GS_SPEED_SELECT(high_speed,
2066                         gs_bulk_highspeed_function,
2067                         gs_bulk_fullspeed_function);
2068         }
2069
2070         /* for now, don't advertise srp-only devices */
2071         if (!is_otg)
2072                 function++;
2073
2074         len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
2075         if (len < 0)
2076                 return len;
2077
2078         ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
2079
2080         return len;
2081 }
2082
2083 /*
2084  * gs_alloc_req
2085  *
2086  * Allocate a usb_request and its buffer.  Returns a pointer to the
2087  * usb_request or NULL if there is an error.
2088  */
2089 static struct usb_request *
2090 gs_alloc_req(struct usb_ep *ep, unsigned int len, gfp_t kmalloc_flags)
2091 {
2092         struct usb_request *req;
2093
2094         if (ep == NULL)
2095                 return NULL;
2096
2097         req = usb_ep_alloc_request(ep, kmalloc_flags);
2098
2099         if (req != NULL) {
2100                 req->length = len;
2101                 req->buf = kmalloc(len, kmalloc_flags);
2102                 if (req->buf == NULL) {
2103                         usb_ep_free_request(ep, req);
2104                         return NULL;
2105                 }
2106         }
2107
2108         return req;
2109 }
2110
2111 /*
2112  * gs_free_req
2113  *
2114  * Free a usb_request and its buffer.
2115  */
2116 static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
2117 {
2118         if (ep != NULL && req != NULL) {
2119                 kfree(req->buf);
2120                 usb_ep_free_request(ep, req);
2121         }
2122 }
2123
2124 /*
2125  * gs_alloc_req_entry
2126  *
2127  * Allocates a request and its buffer, using the given
2128  * endpoint, buffer len, and kmalloc flags.
2129  */
2130 static struct gs_req_entry *
2131 gs_alloc_req_entry(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
2132 {
2133         struct gs_req_entry     *req;
2134
2135         req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
2136         if (req == NULL)
2137                 return NULL;
2138
2139         req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
2140         if (req->re_req == NULL) {
2141                 kfree(req);
2142                 return NULL;
2143         }
2144
2145         req->re_req->context = req;
2146
2147         return req;
2148 }
2149
2150 /*
2151  * gs_free_req_entry
2152  *
2153  * Frees a request and its buffer.
2154  */
2155 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
2156 {
2157         if (ep != NULL && req != NULL) {
2158                 if (req->re_req != NULL)
2159                         gs_free_req(ep, req->re_req);
2160                 kfree(req);
2161         }
2162 }
2163
2164 /*
2165  * gs_alloc_ports
2166  *
2167  * Allocate all ports and set the gs_dev struct to point to them.
2168  * Return 0 if successful, or a negative error number.
2169  *
2170  * The device lock is normally held when calling this function.
2171  */
2172 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags)
2173 {
2174         int i;
2175         struct gs_port *port;
2176
2177         if (dev == NULL)
2178                 return -EIO;
2179
2180         for (i=0; i<GS_NUM_PORTS; i++) {
2181                 if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
2182                         return -ENOMEM;
2183
2184                 port->port_dev = dev;
2185                 port->port_num = i;
2186                 port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
2187                 port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
2188                 port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
2189                 port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
2190                 spin_lock_init(&port->port_lock);
2191                 init_waitqueue_head(&port->port_write_wait);
2192
2193                 dev->dev_port[i] = port;
2194         }
2195
2196         return 0;
2197 }
2198
2199 /*
2200  * gs_free_ports
2201  *
2202  * Free all closed ports.  Open ports are disconnected by
2203  * freeing their write buffers, setting their device pointers
2204  * and the pointers to them in the device to NULL.  These
2205  * ports will be freed when closed.
2206  *
2207  * The device lock is normally held when calling this function.
2208  */
2209 static void gs_free_ports(struct gs_dev *dev)
2210 {
2211         int i;
2212         unsigned long flags;
2213         struct gs_port *port;
2214
2215         if (dev == NULL)
2216                 return;
2217
2218         for (i=0; i<GS_NUM_PORTS; i++) {
2219                 if ((port=dev->dev_port[i]) != NULL) {
2220                         dev->dev_port[i] = NULL;
2221
2222                         spin_lock_irqsave(&port->port_lock, flags);
2223
2224                         if (port->port_write_buf != NULL) {
2225                                 gs_buf_free(port->port_write_buf);
2226                                 port->port_write_buf = NULL;
2227                         }
2228
2229                         if (port->port_open_count > 0 || port->port_in_use) {
2230                                 port->port_dev = NULL;
2231                                 wake_up_interruptible(&port->port_write_wait);
2232                                 if (port->port_tty) {
2233                                         wake_up_interruptible(&port->port_tty->read_wait);
2234                                         wake_up_interruptible(&port->port_tty->write_wait);
2235                                 }
2236                                 spin_unlock_irqrestore(&port->port_lock, flags);
2237                         } else {
2238                                 spin_unlock_irqrestore(&port->port_lock, flags);
2239                                 kfree(port);
2240                         }
2241
2242                 }
2243         }
2244 }
2245
2246 /* Circular Buffer */
2247
2248 /*
2249  * gs_buf_alloc
2250  *
2251  * Allocate a circular buffer and all associated memory.
2252  */
2253 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags)
2254 {
2255         struct gs_buf *gb;
2256
2257         if (size == 0)
2258                 return NULL;
2259
2260         gb = (struct gs_buf *)kmalloc(sizeof(struct gs_buf), kmalloc_flags);
2261         if (gb == NULL)
2262                 return NULL;
2263
2264         gb->buf_buf = kmalloc(size, kmalloc_flags);
2265         if (gb->buf_buf == NULL) {
2266                 kfree(gb);
2267                 return NULL;
2268         }
2269
2270         gb->buf_size = size;
2271         gb->buf_get = gb->buf_put = gb->buf_buf;
2272
2273         return gb;
2274 }
2275
2276 /*
2277  * gs_buf_free
2278  *
2279  * Free the buffer and all associated memory.
2280  */
2281 void gs_buf_free(struct gs_buf *gb)
2282 {
2283         if (gb) {
2284                 kfree(gb->buf_buf);
2285                 kfree(gb);
2286         }
2287 }
2288
2289 /*
2290  * gs_buf_clear
2291  *
2292  * Clear out all data in the circular buffer.
2293  */
2294 void gs_buf_clear(struct gs_buf *gb)
2295 {
2296         if (gb != NULL)
2297                 gb->buf_get = gb->buf_put;
2298                 /* equivalent to a get of all data available */
2299 }
2300
2301 /*
2302  * gs_buf_data_avail
2303  *
2304  * Return the number of bytes of data available in the circular
2305  * buffer.
2306  */
2307 unsigned int gs_buf_data_avail(struct gs_buf *gb)
2308 {
2309         if (gb != NULL)
2310                 return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
2311         else
2312                 return 0;
2313 }
2314
2315 /*
2316  * gs_buf_space_avail
2317  *
2318  * Return the number of bytes of space available in the circular
2319  * buffer.
2320  */
2321 unsigned int gs_buf_space_avail(struct gs_buf *gb)
2322 {
2323         if (gb != NULL)
2324                 return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
2325         else
2326                 return 0;
2327 }
2328
2329 /*
2330  * gs_buf_put
2331  *
2332  * Copy data data from a user buffer and put it into the circular buffer.
2333  * Restrict to the amount of space available.
2334  *
2335  * Return the number of bytes copied.
2336  */
2337 unsigned int gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
2338 {
2339         unsigned int len;
2340
2341         if (gb == NULL)
2342                 return 0;
2343
2344         len  = gs_buf_space_avail(gb);
2345         if (count > len)
2346                 count = len;
2347
2348         if (count == 0)
2349                 return 0;
2350
2351         len = gb->buf_buf + gb->buf_size - gb->buf_put;
2352         if (count > len) {
2353                 memcpy(gb->buf_put, buf, len);
2354                 memcpy(gb->buf_buf, buf+len, count - len);
2355                 gb->buf_put = gb->buf_buf + count - len;
2356         } else {
2357                 memcpy(gb->buf_put, buf, count);
2358                 if (count < len)
2359                         gb->buf_put += count;
2360                 else /* count == len */
2361                         gb->buf_put = gb->buf_buf;
2362         }
2363
2364         return count;
2365 }
2366
2367 /*
2368  * gs_buf_get
2369  *
2370  * Get data from the circular buffer and copy to the given buffer.
2371  * Restrict to the amount of data available.
2372  *
2373  * Return the number of bytes copied.
2374  */
2375 unsigned int gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
2376 {
2377         unsigned int len;
2378
2379         if (gb == NULL)
2380                 return 0;
2381
2382         len = gs_buf_data_avail(gb);
2383         if (count > len)
2384                 count = len;
2385
2386         if (count == 0)
2387                 return 0;
2388
2389         len = gb->buf_buf + gb->buf_size - gb->buf_get;
2390         if (count > len) {
2391                 memcpy(buf, gb->buf_get, len);
2392                 memcpy(buf+len, gb->buf_buf, count - len);
2393                 gb->buf_get = gb->buf_buf + count - len;
2394         } else {
2395                 memcpy(buf, gb->buf_get, count);
2396                 if (count < len)
2397                         gb->buf_get += count;
2398                 else /* count == len */
2399                         gb->buf_get = gb->buf_buf;
2400         }
2401
2402         return count;
2403 }