| 1 | /* |
| 2 | * Belkin USB Serial Adapter Driver |
| 3 | * |
| 4 | * Copyright (C) 2000 William Greathouse (wgreathouse@smva.com) |
| 5 | * Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com) |
| 6 | * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com) |
| 7 | * |
| 8 | * This program is largely derived from work by the linux-usb group |
| 9 | * and associated source files. Please see the usb/serial files for |
| 10 | * individual credits and copyrights. |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * See Documentation/usb/usb-serial.txt for more information on using this |
| 18 | * driver |
| 19 | * |
| 20 | * TODO: |
| 21 | * -- Add true modem contol line query capability. Currently we track the |
| 22 | * states reported by the interrupt and the states we request. |
| 23 | * -- Add support for flush commands |
| 24 | */ |
| 25 | |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/tty.h> |
| 31 | #include <linux/tty_driver.h> |
| 32 | #include <linux/tty_flip.h> |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/spinlock.h> |
| 35 | #include <linux/uaccess.h> |
| 36 | #include <linux/usb.h> |
| 37 | #include <linux/usb/serial.h> |
| 38 | #include "belkin_sa.h" |
| 39 | |
| 40 | /* |
| 41 | * Version Information |
| 42 | */ |
| 43 | #define DRIVER_VERSION "v1.3" |
| 44 | #define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>" |
| 45 | #define DRIVER_DESC "USB Belkin Serial converter driver" |
| 46 | |
| 47 | /* function prototypes for a Belkin USB Serial Adapter F5U103 */ |
| 48 | static int belkin_sa_startup(struct usb_serial *serial); |
| 49 | static void belkin_sa_release(struct usb_serial *serial); |
| 50 | static int belkin_sa_open(struct tty_struct *tty, |
| 51 | struct usb_serial_port *port); |
| 52 | static void belkin_sa_close(struct usb_serial_port *port); |
| 53 | static void belkin_sa_read_int_callback(struct urb *urb); |
| 54 | static void belkin_sa_process_read_urb(struct urb *urb); |
| 55 | static void belkin_sa_set_termios(struct tty_struct *tty, |
| 56 | struct usb_serial_port *port, struct ktermios * old); |
| 57 | static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state); |
| 58 | static int belkin_sa_tiocmget(struct tty_struct *tty); |
| 59 | static int belkin_sa_tiocmset(struct tty_struct *tty, |
| 60 | unsigned int set, unsigned int clear); |
| 61 | |
| 62 | |
| 63 | static const struct usb_device_id id_table[] = { |
| 64 | { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) }, |
| 65 | { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) }, |
| 66 | { USB_DEVICE(PERACOM_VID, PERACOM_PID) }, |
| 67 | { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) }, |
| 68 | { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) }, |
| 69 | { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) }, |
| 70 | { } /* Terminating entry */ |
| 71 | }; |
| 72 | MODULE_DEVICE_TABLE(usb, id_table); |
| 73 | |
| 74 | /* All of the device info needed for the serial converters */ |
| 75 | static struct usb_serial_driver belkin_device = { |
| 76 | .driver = { |
| 77 | .owner = THIS_MODULE, |
| 78 | .name = "belkin", |
| 79 | }, |
| 80 | .description = "Belkin / Peracom / GoHubs USB Serial Adapter", |
| 81 | .id_table = id_table, |
| 82 | .num_ports = 1, |
| 83 | .open = belkin_sa_open, |
| 84 | .close = belkin_sa_close, |
| 85 | .read_int_callback = belkin_sa_read_int_callback, |
| 86 | .process_read_urb = belkin_sa_process_read_urb, |
| 87 | .set_termios = belkin_sa_set_termios, |
| 88 | .break_ctl = belkin_sa_break_ctl, |
| 89 | .tiocmget = belkin_sa_tiocmget, |
| 90 | .tiocmset = belkin_sa_tiocmset, |
| 91 | .attach = belkin_sa_startup, |
| 92 | .release = belkin_sa_release, |
| 93 | }; |
| 94 | |
| 95 | static struct usb_serial_driver * const serial_drivers[] = { |
| 96 | &belkin_device, NULL |
| 97 | }; |
| 98 | |
| 99 | struct belkin_sa_private { |
| 100 | spinlock_t lock; |
| 101 | unsigned long control_state; |
| 102 | unsigned char last_lsr; |
| 103 | unsigned char last_msr; |
| 104 | int bad_flow_control; |
| 105 | }; |
| 106 | |
| 107 | |
| 108 | /* |
| 109 | * *************************************************************************** |
| 110 | * Belkin USB Serial Adapter F5U103 specific driver functions |
| 111 | * *************************************************************************** |
| 112 | */ |
| 113 | |
| 114 | #define WDR_TIMEOUT 5000 /* default urb timeout */ |
| 115 | |
| 116 | /* assumes that struct usb_serial *serial is available */ |
| 117 | #define BSA_USB_CMD(c, v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \ |
| 118 | (c), BELKIN_SA_SET_REQUEST_TYPE, \ |
| 119 | (v), 0, NULL, 0, WDR_TIMEOUT) |
| 120 | |
| 121 | /* do some startup allocations not currently performed by usb_serial_probe() */ |
| 122 | static int belkin_sa_startup(struct usb_serial *serial) |
| 123 | { |
| 124 | struct usb_device *dev = serial->dev; |
| 125 | struct belkin_sa_private *priv; |
| 126 | |
| 127 | /* allocate the private data structure */ |
| 128 | priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL); |
| 129 | if (!priv) |
| 130 | return -1; /* error */ |
| 131 | /* set initial values for control structures */ |
| 132 | spin_lock_init(&priv->lock); |
| 133 | priv->control_state = 0; |
| 134 | priv->last_lsr = 0; |
| 135 | priv->last_msr = 0; |
| 136 | /* see comments at top of file */ |
| 137 | priv->bad_flow_control = |
| 138 | (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0; |
| 139 | dev_info(&dev->dev, "bcdDevice: %04x, bfc: %d\n", |
| 140 | le16_to_cpu(dev->descriptor.bcdDevice), |
| 141 | priv->bad_flow_control); |
| 142 | |
| 143 | init_waitqueue_head(&serial->port[0]->write_wait); |
| 144 | usb_set_serial_port_data(serial->port[0], priv); |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | static void belkin_sa_release(struct usb_serial *serial) |
| 150 | { |
| 151 | int i; |
| 152 | |
| 153 | for (i = 0; i < serial->num_ports; ++i) |
| 154 | kfree(usb_get_serial_port_data(serial->port[i])); |
| 155 | } |
| 156 | |
| 157 | static int belkin_sa_open(struct tty_struct *tty, |
| 158 | struct usb_serial_port *port) |
| 159 | { |
| 160 | int retval; |
| 161 | |
| 162 | retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
| 163 | if (retval) { |
| 164 | dev_err(&port->dev, "usb_submit_urb(read int) failed\n"); |
| 165 | return retval; |
| 166 | } |
| 167 | |
| 168 | retval = usb_serial_generic_open(tty, port); |
| 169 | if (retval) |
| 170 | usb_kill_urb(port->interrupt_in_urb); |
| 171 | |
| 172 | return retval; |
| 173 | } |
| 174 | |
| 175 | static void belkin_sa_close(struct usb_serial_port *port) |
| 176 | { |
| 177 | usb_serial_generic_close(port); |
| 178 | usb_kill_urb(port->interrupt_in_urb); |
| 179 | } |
| 180 | |
| 181 | static void belkin_sa_read_int_callback(struct urb *urb) |
| 182 | { |
| 183 | struct usb_serial_port *port = urb->context; |
| 184 | struct belkin_sa_private *priv; |
| 185 | unsigned char *data = urb->transfer_buffer; |
| 186 | int retval; |
| 187 | int status = urb->status; |
| 188 | unsigned long flags; |
| 189 | |
| 190 | switch (status) { |
| 191 | case 0: |
| 192 | /* success */ |
| 193 | break; |
| 194 | case -ECONNRESET: |
| 195 | case -ENOENT: |
| 196 | case -ESHUTDOWN: |
| 197 | /* this urb is terminated, clean up */ |
| 198 | dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", |
| 199 | __func__, status); |
| 200 | return; |
| 201 | default: |
| 202 | dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", |
| 203 | __func__, status); |
| 204 | goto exit; |
| 205 | } |
| 206 | |
| 207 | usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); |
| 208 | |
| 209 | /* Handle known interrupt data */ |
| 210 | /* ignore data[0] and data[1] */ |
| 211 | |
| 212 | priv = usb_get_serial_port_data(port); |
| 213 | spin_lock_irqsave(&priv->lock, flags); |
| 214 | priv->last_msr = data[BELKIN_SA_MSR_INDEX]; |
| 215 | |
| 216 | /* Record Control Line states */ |
| 217 | if (priv->last_msr & BELKIN_SA_MSR_DSR) |
| 218 | priv->control_state |= TIOCM_DSR; |
| 219 | else |
| 220 | priv->control_state &= ~TIOCM_DSR; |
| 221 | |
| 222 | if (priv->last_msr & BELKIN_SA_MSR_CTS) |
| 223 | priv->control_state |= TIOCM_CTS; |
| 224 | else |
| 225 | priv->control_state &= ~TIOCM_CTS; |
| 226 | |
| 227 | if (priv->last_msr & BELKIN_SA_MSR_RI) |
| 228 | priv->control_state |= TIOCM_RI; |
| 229 | else |
| 230 | priv->control_state &= ~TIOCM_RI; |
| 231 | |
| 232 | if (priv->last_msr & BELKIN_SA_MSR_CD) |
| 233 | priv->control_state |= TIOCM_CD; |
| 234 | else |
| 235 | priv->control_state &= ~TIOCM_CD; |
| 236 | |
| 237 | priv->last_lsr = data[BELKIN_SA_LSR_INDEX]; |
| 238 | spin_unlock_irqrestore(&priv->lock, flags); |
| 239 | exit: |
| 240 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
| 241 | if (retval) |
| 242 | dev_err(&port->dev, "%s - usb_submit_urb failed with " |
| 243 | "result %d\n", __func__, retval); |
| 244 | } |
| 245 | |
| 246 | static void belkin_sa_process_read_urb(struct urb *urb) |
| 247 | { |
| 248 | struct usb_serial_port *port = urb->context; |
| 249 | struct belkin_sa_private *priv = usb_get_serial_port_data(port); |
| 250 | struct tty_struct *tty; |
| 251 | unsigned char *data = urb->transfer_buffer; |
| 252 | unsigned long flags; |
| 253 | unsigned char status; |
| 254 | char tty_flag; |
| 255 | |
| 256 | /* Update line status */ |
| 257 | tty_flag = TTY_NORMAL; |
| 258 | |
| 259 | spin_lock_irqsave(&priv->lock, flags); |
| 260 | status = priv->last_lsr; |
| 261 | priv->last_lsr &= ~BELKIN_SA_LSR_ERR; |
| 262 | spin_unlock_irqrestore(&priv->lock, flags); |
| 263 | |
| 264 | if (!urb->actual_length) |
| 265 | return; |
| 266 | |
| 267 | tty = tty_port_tty_get(&port->port); |
| 268 | if (!tty) |
| 269 | return; |
| 270 | |
| 271 | if (status & BELKIN_SA_LSR_ERR) { |
| 272 | /* Break takes precedence over parity, which takes precedence |
| 273 | * over framing errors. */ |
| 274 | if (status & BELKIN_SA_LSR_BI) |
| 275 | tty_flag = TTY_BREAK; |
| 276 | else if (status & BELKIN_SA_LSR_PE) |
| 277 | tty_flag = TTY_PARITY; |
| 278 | else if (status & BELKIN_SA_LSR_FE) |
| 279 | tty_flag = TTY_FRAME; |
| 280 | dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag); |
| 281 | |
| 282 | /* Overrun is special, not associated with a char. */ |
| 283 | if (status & BELKIN_SA_LSR_OE) |
| 284 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
| 285 | } |
| 286 | |
| 287 | tty_insert_flip_string_fixed_flag(tty, data, tty_flag, |
| 288 | urb->actual_length); |
| 289 | tty_flip_buffer_push(tty); |
| 290 | tty_kref_put(tty); |
| 291 | } |
| 292 | |
| 293 | static void belkin_sa_set_termios(struct tty_struct *tty, |
| 294 | struct usb_serial_port *port, struct ktermios *old_termios) |
| 295 | { |
| 296 | struct usb_serial *serial = port->serial; |
| 297 | struct belkin_sa_private *priv = usb_get_serial_port_data(port); |
| 298 | unsigned int iflag; |
| 299 | unsigned int cflag; |
| 300 | unsigned int old_iflag = 0; |
| 301 | unsigned int old_cflag = 0; |
| 302 | __u16 urb_value = 0; /* Will hold the new flags */ |
| 303 | unsigned long flags; |
| 304 | unsigned long control_state; |
| 305 | int bad_flow_control; |
| 306 | speed_t baud; |
| 307 | struct ktermios *termios = &tty->termios; |
| 308 | |
| 309 | iflag = termios->c_iflag; |
| 310 | cflag = termios->c_cflag; |
| 311 | |
| 312 | termios->c_cflag &= ~CMSPAR; |
| 313 | |
| 314 | /* get a local copy of the current port settings */ |
| 315 | spin_lock_irqsave(&priv->lock, flags); |
| 316 | control_state = priv->control_state; |
| 317 | bad_flow_control = priv->bad_flow_control; |
| 318 | spin_unlock_irqrestore(&priv->lock, flags); |
| 319 | |
| 320 | old_iflag = old_termios->c_iflag; |
| 321 | old_cflag = old_termios->c_cflag; |
| 322 | |
| 323 | /* Set the baud rate */ |
| 324 | if ((cflag & CBAUD) != (old_cflag & CBAUD)) { |
| 325 | /* reassert DTR and (maybe) RTS on transition from B0 */ |
| 326 | if ((old_cflag & CBAUD) == B0) { |
| 327 | control_state |= (TIOCM_DTR|TIOCM_RTS); |
| 328 | if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0) |
| 329 | dev_err(&port->dev, "Set DTR error\n"); |
| 330 | /* don't set RTS if using hardware flow control */ |
| 331 | if (!(old_cflag & CRTSCTS)) |
| 332 | if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST |
| 333 | , 1) < 0) |
| 334 | dev_err(&port->dev, "Set RTS error\n"); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | baud = tty_get_baud_rate(tty); |
| 339 | if (baud) { |
| 340 | urb_value = BELKIN_SA_BAUD(baud); |
| 341 | /* Clip to maximum speed */ |
| 342 | if (urb_value == 0) |
| 343 | urb_value = 1; |
| 344 | /* Turn it back into a resulting real baud rate */ |
| 345 | baud = BELKIN_SA_BAUD(urb_value); |
| 346 | |
| 347 | /* Report the actual baud rate back to the caller */ |
| 348 | tty_encode_baud_rate(tty, baud, baud); |
| 349 | if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0) |
| 350 | dev_err(&port->dev, "Set baudrate error\n"); |
| 351 | } else { |
| 352 | /* Disable flow control */ |
| 353 | if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, |
| 354 | BELKIN_SA_FLOW_NONE) < 0) |
| 355 | dev_err(&port->dev, "Disable flowcontrol error\n"); |
| 356 | /* Drop RTS and DTR */ |
| 357 | control_state &= ~(TIOCM_DTR | TIOCM_RTS); |
| 358 | if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0) |
| 359 | dev_err(&port->dev, "DTR LOW error\n"); |
| 360 | if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0) |
| 361 | dev_err(&port->dev, "RTS LOW error\n"); |
| 362 | } |
| 363 | |
| 364 | /* set the parity */ |
| 365 | if ((cflag ^ old_cflag) & (PARENB | PARODD)) { |
| 366 | if (cflag & PARENB) |
| 367 | urb_value = (cflag & PARODD) ? BELKIN_SA_PARITY_ODD |
| 368 | : BELKIN_SA_PARITY_EVEN; |
| 369 | else |
| 370 | urb_value = BELKIN_SA_PARITY_NONE; |
| 371 | if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0) |
| 372 | dev_err(&port->dev, "Set parity error\n"); |
| 373 | } |
| 374 | |
| 375 | /* set the number of data bits */ |
| 376 | if ((cflag & CSIZE) != (old_cflag & CSIZE)) { |
| 377 | switch (cflag & CSIZE) { |
| 378 | case CS5: |
| 379 | urb_value = BELKIN_SA_DATA_BITS(5); |
| 380 | break; |
| 381 | case CS6: |
| 382 | urb_value = BELKIN_SA_DATA_BITS(6); |
| 383 | break; |
| 384 | case CS7: |
| 385 | urb_value = BELKIN_SA_DATA_BITS(7); |
| 386 | break; |
| 387 | case CS8: |
| 388 | urb_value = BELKIN_SA_DATA_BITS(8); |
| 389 | break; |
| 390 | default: |
| 391 | dev_dbg(&port->dev, |
| 392 | "CSIZE was not CS5-CS8, using default of 8\n"); |
| 393 | urb_value = BELKIN_SA_DATA_BITS(8); |
| 394 | break; |
| 395 | } |
| 396 | if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0) |
| 397 | dev_err(&port->dev, "Set data bits error\n"); |
| 398 | } |
| 399 | |
| 400 | /* set the number of stop bits */ |
| 401 | if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { |
| 402 | urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) |
| 403 | : BELKIN_SA_STOP_BITS(1); |
| 404 | if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, |
| 405 | urb_value) < 0) |
| 406 | dev_err(&port->dev, "Set stop bits error\n"); |
| 407 | } |
| 408 | |
| 409 | /* Set flow control */ |
| 410 | if (((iflag ^ old_iflag) & (IXOFF | IXON)) || |
| 411 | ((cflag ^ old_cflag) & CRTSCTS)) { |
| 412 | urb_value = 0; |
| 413 | if ((iflag & IXOFF) || (iflag & IXON)) |
| 414 | urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON); |
| 415 | else |
| 416 | urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON); |
| 417 | |
| 418 | if (cflag & CRTSCTS) |
| 419 | urb_value |= (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS); |
| 420 | else |
| 421 | urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS); |
| 422 | |
| 423 | if (bad_flow_control) |
| 424 | urb_value &= ~(BELKIN_SA_FLOW_IRTS); |
| 425 | |
| 426 | if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0) |
| 427 | dev_err(&port->dev, "Set flow control error\n"); |
| 428 | } |
| 429 | |
| 430 | /* save off the modified port settings */ |
| 431 | spin_lock_irqsave(&priv->lock, flags); |
| 432 | priv->control_state = control_state; |
| 433 | spin_unlock_irqrestore(&priv->lock, flags); |
| 434 | } |
| 435 | |
| 436 | static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state) |
| 437 | { |
| 438 | struct usb_serial_port *port = tty->driver_data; |
| 439 | struct usb_serial *serial = port->serial; |
| 440 | |
| 441 | if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0) |
| 442 | dev_err(&port->dev, "Set break_ctl %d\n", break_state); |
| 443 | } |
| 444 | |
| 445 | static int belkin_sa_tiocmget(struct tty_struct *tty) |
| 446 | { |
| 447 | struct usb_serial_port *port = tty->driver_data; |
| 448 | struct belkin_sa_private *priv = usb_get_serial_port_data(port); |
| 449 | unsigned long control_state; |
| 450 | unsigned long flags; |
| 451 | |
| 452 | spin_lock_irqsave(&priv->lock, flags); |
| 453 | control_state = priv->control_state; |
| 454 | spin_unlock_irqrestore(&priv->lock, flags); |
| 455 | |
| 456 | return control_state; |
| 457 | } |
| 458 | |
| 459 | static int belkin_sa_tiocmset(struct tty_struct *tty, |
| 460 | unsigned int set, unsigned int clear) |
| 461 | { |
| 462 | struct usb_serial_port *port = tty->driver_data; |
| 463 | struct usb_serial *serial = port->serial; |
| 464 | struct belkin_sa_private *priv = usb_get_serial_port_data(port); |
| 465 | unsigned long control_state; |
| 466 | unsigned long flags; |
| 467 | int retval; |
| 468 | int rts = 0; |
| 469 | int dtr = 0; |
| 470 | |
| 471 | spin_lock_irqsave(&priv->lock, flags); |
| 472 | control_state = priv->control_state; |
| 473 | |
| 474 | if (set & TIOCM_RTS) { |
| 475 | control_state |= TIOCM_RTS; |
| 476 | rts = 1; |
| 477 | } |
| 478 | if (set & TIOCM_DTR) { |
| 479 | control_state |= TIOCM_DTR; |
| 480 | dtr = 1; |
| 481 | } |
| 482 | if (clear & TIOCM_RTS) { |
| 483 | control_state &= ~TIOCM_RTS; |
| 484 | rts = 0; |
| 485 | } |
| 486 | if (clear & TIOCM_DTR) { |
| 487 | control_state &= ~TIOCM_DTR; |
| 488 | dtr = 0; |
| 489 | } |
| 490 | |
| 491 | priv->control_state = control_state; |
| 492 | spin_unlock_irqrestore(&priv->lock, flags); |
| 493 | |
| 494 | retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts); |
| 495 | if (retval < 0) { |
| 496 | dev_err(&port->dev, "Set RTS error %d\n", retval); |
| 497 | goto exit; |
| 498 | } |
| 499 | |
| 500 | retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr); |
| 501 | if (retval < 0) { |
| 502 | dev_err(&port->dev, "Set DTR error %d\n", retval); |
| 503 | goto exit; |
| 504 | } |
| 505 | exit: |
| 506 | return retval; |
| 507 | } |
| 508 | |
| 509 | module_usb_serial_driver(serial_drivers, id_table); |
| 510 | |
| 511 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 512 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 513 | MODULE_VERSION(DRIVER_VERSION); |
| 514 | MODULE_LICENSE("GPL"); |