1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Clean ups from Moschip version and a few ioctl implementations by: 4 * Paul B Schroeder <pschroeder "at" uplogix "dot" com> 5 * 6 * Originally based on drivers/usb/serial/io_edgeport.c which is: 7 * Copyright (C) 2000 Inside Out Networks, All rights reserved. 8 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> 9 * 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/errno.h> 14 #include <linux/slab.h> 15 #include <linux/tty.h> 16 #include <linux/tty_driver.h> 17 #include <linux/tty_flip.h> 18 #include <linux/module.h> 19 #include <linux/serial.h> 20 #include <linux/usb.h> 21 #include <linux/usb/serial.h> 22 #include <linux/uaccess.h> 23 24 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver" 25 26 /* 27 * 16C50 UART register defines 28 */ 29 30 #define LCR_BITS_5 0x00 /* 5 bits/char */ 31 #define LCR_BITS_6 0x01 /* 6 bits/char */ 32 #define LCR_BITS_7 0x02 /* 7 bits/char */ 33 #define LCR_BITS_8 0x03 /* 8 bits/char */ 34 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ 35 36 #define LCR_STOP_1 0x00 /* 1 stop bit */ 37 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */ 38 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */ 39 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ 40 41 #define LCR_PAR_NONE 0x00 /* No parity */ 42 #define LCR_PAR_ODD 0x08 /* Odd parity */ 43 #define LCR_PAR_EVEN 0x18 /* Even parity */ 44 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */ 45 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */ 46 #define LCR_PAR_MASK 0x38 /* Mask for parity field */ 47 48 #define LCR_SET_BREAK 0x40 /* Set Break condition */ 49 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */ 50 51 #define MCR_DTR 0x01 /* Assert DTR */ 52 #define MCR_RTS 0x02 /* Assert RTS */ 53 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */ 54 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */ 55 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */ 56 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */ 57 58 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */ 59 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */ 60 #define MOS7840_MSR_RI 0x40 /* Current state of RI */ 61 #define MOS7840_MSR_CD 0x80 /* Current state of CD */ 62 63 /* 64 * Defines used for sending commands to port 65 */ 66 67 #define MOS_WDR_TIMEOUT 5000 /* default urb timeout */ 68 69 #define MOS_PORT1 0x0200 70 #define MOS_PORT2 0x0300 71 #define MOS_VENREG 0x0000 72 #define MOS_MAX_PORT 0x02 73 #define MOS_WRITE 0x0E 74 #define MOS_READ 0x0D 75 76 /* Requests */ 77 #define MCS_RD_RTYPE 0xC0 78 #define MCS_WR_RTYPE 0x40 79 #define MCS_RDREQ 0x0D 80 #define MCS_WRREQ 0x0E 81 #define MCS_CTRL_TIMEOUT 500 82 #define VENDOR_READ_LENGTH (0x01) 83 84 #define MAX_NAME_LEN 64 85 86 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */ 87 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */ 88 89 /* For higher baud Rates use TIOCEXBAUD */ 90 #define TIOCEXBAUD 0x5462 91 92 /* 93 * Vendor id and device id defines 94 * 95 * NOTE: Do not add new defines, add entries directly to the id_table instead. 96 */ 97 #define USB_VENDOR_ID_BANDB 0x0856 98 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22 99 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00 100 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24 101 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01 102 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29 103 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30 104 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31 105 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32 106 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42 107 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02 108 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44 109 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03 110 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24 111 112 /* Interrupt Routine Defines */ 113 114 #define SERIAL_IIR_RLS 0x06 115 #define SERIAL_IIR_MS 0x00 116 117 /* 118 * Emulation of the bit mask on the LINE STATUS REGISTER. 119 */ 120 #define SERIAL_LSR_DR 0x0001 121 #define SERIAL_LSR_OE 0x0002 122 #define SERIAL_LSR_PE 0x0004 123 #define SERIAL_LSR_FE 0x0008 124 #define SERIAL_LSR_BI 0x0010 125 126 #define MOS_MSR_DELTA_CTS 0x10 127 #define MOS_MSR_DELTA_DSR 0x20 128 #define MOS_MSR_DELTA_RI 0x40 129 #define MOS_MSR_DELTA_CD 0x80 130 131 /* Serial Port register Address */ 132 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01)) 133 #define FIFO_CONTROL_REGISTER ((__u16)(0x02)) 134 #define LINE_CONTROL_REGISTER ((__u16)(0x03)) 135 #define MODEM_CONTROL_REGISTER ((__u16)(0x04)) 136 #define LINE_STATUS_REGISTER ((__u16)(0x05)) 137 #define MODEM_STATUS_REGISTER ((__u16)(0x06)) 138 #define SCRATCH_PAD_REGISTER ((__u16)(0x07)) 139 #define DIVISOR_LATCH_LSB ((__u16)(0x00)) 140 #define DIVISOR_LATCH_MSB ((__u16)(0x01)) 141 142 #define CLK_MULTI_REGISTER ((__u16)(0x02)) 143 #define CLK_START_VALUE_REGISTER ((__u16)(0x03)) 144 #define GPIO_REGISTER ((__u16)(0x07)) 145 146 #define SERIAL_LCR_DLAB ((__u16)(0x0080)) 147 148 /* 149 * URB POOL related defines 150 */ 151 #define NUM_URBS 16 /* URB Count */ 152 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 153 154 /* LED on/off milliseconds*/ 155 #define LED_ON_MS 500 156 #define LED_OFF_MS 500 157 158 enum mos7840_flag { 159 MOS7840_FLAG_LED_BUSY, 160 }; 161 162 #define MCS_PORT_MASK GENMASK(2, 0) 163 #define MCS_PORTS(nr) ((nr) & MCS_PORT_MASK) 164 #define MCS_LED BIT(3) 165 166 #define MCS_DEVICE(vid, pid, flags) \ 167 USB_DEVICE((vid), (pid)), .driver_info = (flags) 168 169 static const struct usb_device_id id_table[] = { 170 { MCS_DEVICE(0x0557, 0x2011, MCS_PORTS(4)) }, /* ATEN UC2324 */ 171 { MCS_DEVICE(0x0557, 0x7820, MCS_PORTS(2)) }, /* ATEN UC2322 */ 172 { MCS_DEVICE(0x110a, 0x2210, MCS_PORTS(2)) }, /* Moxa UPort 2210 */ 173 { MCS_DEVICE(0x9710, 0x7810, MCS_PORTS(1) | MCS_LED) }, /* ASIX MCS7810 */ 174 { MCS_DEVICE(0x9710, 0x7820, MCS_PORTS(2)) }, /* MosChip MCS7820 */ 175 { MCS_DEVICE(0x9710, 0x7840, MCS_PORTS(4)) }, /* MosChip MCS7840 */ 176 { MCS_DEVICE(0x9710, 0x7843, MCS_PORTS(3)) }, /* ASIX MCS7840 3 port */ 177 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2) }, 178 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P) }, 179 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4) }, 180 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P) }, 181 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2) }, 182 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4) }, 183 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2) }, 184 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4) }, 185 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2) }, 186 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P) }, 187 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4) }, 188 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P) }, 189 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4) }, 190 {} /* terminating entry */ 191 }; 192 MODULE_DEVICE_TABLE(usb, id_table); 193 194 /* This structure holds all of the local port information */ 195 196 struct moschip_port { 197 int port_num; /*Actual port number in the device(1,2,etc) */ 198 struct urb *read_urb; /* read URB for this port */ 199 __u8 shadowLCR; /* last LCR value received */ 200 __u8 shadowMCR; /* last MCR value received */ 201 struct usb_serial_port *port; /* loop back to the owner of this object */ 202 203 /* Offsets */ 204 __u8 SpRegOffset; 205 __u8 ControlRegOffset; 206 __u8 DcrRegOffset; 207 208 spinlock_t pool_lock; 209 struct urb *write_urb_pool[NUM_URBS]; 210 char busy[NUM_URBS]; 211 bool read_urb_busy; 212 213 /* For device(s) with LED indicator */ 214 bool has_led; 215 struct timer_list led_timer1; /* Timer for LED on */ 216 struct timer_list led_timer2; /* Timer for LED off */ 217 struct urb *led_urb; 218 struct usb_ctrlrequest *led_dr; 219 220 unsigned long flags; 221 }; 222 223 /* 224 * mos7840_set_reg_sync 225 * To set the Control register by calling usb_fill_control_urb function 226 * by passing usb_sndctrlpipe function as parameter. 227 */ 228 229 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg, 230 __u16 val) 231 { 232 struct usb_device *dev = port->serial->dev; 233 val = val & 0x00ff; 234 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val); 235 236 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 237 MCS_WR_RTYPE, val, reg, NULL, 0, 238 MOS_WDR_TIMEOUT); 239 } 240 241 /* 242 * mos7840_get_reg_sync 243 * To set the Uart register by calling usb_fill_control_urb function by 244 * passing usb_rcvctrlpipe function as parameter. 245 */ 246 247 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg, 248 __u16 *val) 249 { 250 struct usb_device *dev = port->serial->dev; 251 int ret = 0; 252 u8 *buf; 253 254 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 255 if (!buf) 256 return -ENOMEM; 257 258 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 259 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH, 260 MOS_WDR_TIMEOUT); 261 if (ret < VENDOR_READ_LENGTH) { 262 if (ret >= 0) 263 ret = -EIO; 264 goto out; 265 } 266 267 *val = buf[0]; 268 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val); 269 out: 270 kfree(buf); 271 return ret; 272 } 273 274 /* 275 * mos7840_set_uart_reg 276 * To set the Uart register by calling usb_fill_control_urb function by 277 * passing usb_sndctrlpipe function as parameter. 278 */ 279 280 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg, 281 __u16 val) 282 { 283 284 struct usb_device *dev = port->serial->dev; 285 val = val & 0x00ff; 286 /* For the UART control registers, the application number need 287 to be Or'ed */ 288 if (port->serial->num_ports == 2 && port->port_number != 0) 289 val |= ((__u16)port->port_number + 2) << 8; 290 else 291 val |= ((__u16)port->port_number + 1) << 8; 292 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val); 293 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 294 MCS_WR_RTYPE, val, reg, NULL, 0, 295 MOS_WDR_TIMEOUT); 296 297 } 298 299 /* 300 * mos7840_get_uart_reg 301 * To set the Control register by calling usb_fill_control_urb function 302 * by passing usb_rcvctrlpipe function as parameter. 303 */ 304 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg, 305 __u16 *val) 306 { 307 struct usb_device *dev = port->serial->dev; 308 int ret = 0; 309 __u16 Wval; 310 u8 *buf; 311 312 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 313 if (!buf) 314 return -ENOMEM; 315 316 /* Wval is same as application number */ 317 if (port->serial->num_ports == 2 && port->port_number != 0) 318 Wval = ((__u16)port->port_number + 2) << 8; 319 else 320 Wval = ((__u16)port->port_number + 1) << 8; 321 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval); 322 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 323 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH, 324 MOS_WDR_TIMEOUT); 325 if (ret < VENDOR_READ_LENGTH) { 326 if (ret >= 0) 327 ret = -EIO; 328 goto out; 329 } 330 *val = buf[0]; 331 out: 332 kfree(buf); 333 return ret; 334 } 335 336 static void mos7840_dump_serial_port(struct usb_serial_port *port, 337 struct moschip_port *mos7840_port) 338 { 339 340 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset); 341 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset); 342 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset); 343 344 } 345 346 /************************************************************************/ 347 /************************************************************************/ 348 /* U S B C A L L B A C K F U N C T I O N S */ 349 /* U S B C A L L B A C K F U N C T I O N S */ 350 /************************************************************************/ 351 /************************************************************************/ 352 353 static void mos7840_set_led_callback(struct urb *urb) 354 { 355 switch (urb->status) { 356 case 0: 357 /* Success */ 358 break; 359 case -ECONNRESET: 360 case -ENOENT: 361 case -ESHUTDOWN: 362 /* This urb is terminated, clean up */ 363 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n", 364 __func__, urb->status); 365 break; 366 default: 367 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", 368 __func__, urb->status); 369 } 370 } 371 372 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval, 373 __u16 reg) 374 { 375 struct usb_device *dev = mcs->port->serial->dev; 376 struct usb_ctrlrequest *dr = mcs->led_dr; 377 378 dr->bRequestType = MCS_WR_RTYPE; 379 dr->bRequest = MCS_WRREQ; 380 dr->wValue = cpu_to_le16(wval); 381 dr->wIndex = cpu_to_le16(reg); 382 dr->wLength = cpu_to_le16(0); 383 384 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0), 385 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL); 386 387 usb_submit_urb(mcs->led_urb, GFP_ATOMIC); 388 } 389 390 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg, 391 __u16 val) 392 { 393 struct usb_device *dev = port->serial->dev; 394 395 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE, 396 val, reg, NULL, 0, MOS_WDR_TIMEOUT); 397 } 398 399 static void mos7840_led_off(struct timer_list *t) 400 { 401 struct moschip_port *mcs = from_timer(mcs, t, led_timer1); 402 403 /* Turn off LED */ 404 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER); 405 mod_timer(&mcs->led_timer2, 406 jiffies + msecs_to_jiffies(LED_OFF_MS)); 407 } 408 409 static void mos7840_led_flag_off(struct timer_list *t) 410 { 411 struct moschip_port *mcs = from_timer(mcs, t, led_timer2); 412 413 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags); 414 } 415 416 static void mos7840_led_activity(struct usb_serial_port *port) 417 { 418 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 419 420 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags)) 421 return; 422 423 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER); 424 mod_timer(&mos7840_port->led_timer1, 425 jiffies + msecs_to_jiffies(LED_ON_MS)); 426 } 427 428 /***************************************************************************** 429 * mos7840_bulk_in_callback 430 * this is the callback function for when we have received data on the 431 * bulk in endpoint. 432 *****************************************************************************/ 433 434 static void mos7840_bulk_in_callback(struct urb *urb) 435 { 436 struct moschip_port *mos7840_port = urb->context; 437 struct usb_serial_port *port = mos7840_port->port; 438 int retval; 439 unsigned char *data; 440 int status = urb->status; 441 442 if (status) { 443 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 444 mos7840_port->read_urb_busy = false; 445 return; 446 } 447 448 data = urb->transfer_buffer; 449 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 450 451 if (urb->actual_length) { 452 struct tty_port *tport = &mos7840_port->port->port; 453 tty_insert_flip_string(tport, data, urb->actual_length); 454 tty_flip_buffer_push(tport); 455 port->icount.rx += urb->actual_length; 456 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx); 457 } 458 459 if (mos7840_port->has_led) 460 mos7840_led_activity(port); 461 462 mos7840_port->read_urb_busy = true; 463 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 464 465 if (retval) { 466 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 467 mos7840_port->read_urb_busy = false; 468 } 469 } 470 471 /***************************************************************************** 472 * mos7840_bulk_out_data_callback 473 * this is the callback function for when we have finished sending 474 * serial data on the bulk out endpoint. 475 *****************************************************************************/ 476 477 static void mos7840_bulk_out_data_callback(struct urb *urb) 478 { 479 struct moschip_port *mos7840_port = urb->context; 480 struct usb_serial_port *port = mos7840_port->port; 481 int status = urb->status; 482 unsigned long flags; 483 int i; 484 485 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 486 for (i = 0; i < NUM_URBS; i++) { 487 if (urb == mos7840_port->write_urb_pool[i]) { 488 mos7840_port->busy[i] = 0; 489 break; 490 } 491 } 492 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 493 494 if (status) { 495 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status); 496 return; 497 } 498 499 tty_port_tty_wakeup(&port->port); 500 501 } 502 503 /************************************************************************/ 504 /* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */ 505 /************************************************************************/ 506 507 /***************************************************************************** 508 * mos7840_open 509 * this function is called by the tty driver when a port is opened 510 * If successful, we return 0 511 * Otherwise we return a negative error number. 512 *****************************************************************************/ 513 514 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port) 515 { 516 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 517 struct usb_serial *serial = port->serial; 518 int response; 519 int j; 520 struct urb *urb; 521 __u16 Data; 522 int status; 523 524 usb_clear_halt(serial->dev, port->write_urb->pipe); 525 usb_clear_halt(serial->dev, port->read_urb->pipe); 526 527 /* Initialising the write urb pool */ 528 for (j = 0; j < NUM_URBS; ++j) { 529 urb = usb_alloc_urb(0, GFP_KERNEL); 530 mos7840_port->write_urb_pool[j] = urb; 531 if (!urb) 532 continue; 533 534 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 535 GFP_KERNEL); 536 if (!urb->transfer_buffer) { 537 usb_free_urb(urb); 538 mos7840_port->write_urb_pool[j] = NULL; 539 continue; 540 } 541 } 542 543 /***************************************************************************** 544 * Initialize MCS7840 -- Write Init values to corresponding Registers 545 * 546 * Register Index 547 * 1 : IER 548 * 2 : FCR 549 * 3 : LCR 550 * 4 : MCR 551 * 552 * 0x08 : SP1/2 Control Reg 553 *****************************************************************************/ 554 555 /* NEED to check the following Block */ 556 557 Data = 0x0; 558 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 559 if (status < 0) { 560 dev_dbg(&port->dev, "Reading Spreg failed\n"); 561 goto err; 562 } 563 Data |= 0x80; 564 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 565 if (status < 0) { 566 dev_dbg(&port->dev, "writing Spreg failed\n"); 567 goto err; 568 } 569 570 Data &= ~0x80; 571 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 572 if (status < 0) { 573 dev_dbg(&port->dev, "writing Spreg failed\n"); 574 goto err; 575 } 576 /* End of block to be checked */ 577 578 Data = 0x0; 579 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 580 &Data); 581 if (status < 0) { 582 dev_dbg(&port->dev, "Reading Controlreg failed\n"); 583 goto err; 584 } 585 Data |= 0x08; /* Driver done bit */ 586 Data |= 0x20; /* rx_disable */ 587 status = mos7840_set_reg_sync(port, 588 mos7840_port->ControlRegOffset, Data); 589 if (status < 0) { 590 dev_dbg(&port->dev, "writing Controlreg failed\n"); 591 goto err; 592 } 593 /* do register settings here */ 594 /* Set all regs to the device default values. */ 595 /*********************************** 596 * First Disable all interrupts. 597 ***********************************/ 598 Data = 0x00; 599 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 600 if (status < 0) { 601 dev_dbg(&port->dev, "disabling interrupts failed\n"); 602 goto err; 603 } 604 /* Set FIFO_CONTROL_REGISTER to the default value */ 605 Data = 0x00; 606 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 607 if (status < 0) { 608 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n"); 609 goto err; 610 } 611 612 Data = 0xcf; 613 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 614 if (status < 0) { 615 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n"); 616 goto err; 617 } 618 619 Data = 0x03; 620 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 621 mos7840_port->shadowLCR = Data; 622 623 Data = 0x0b; 624 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 625 mos7840_port->shadowMCR = Data; 626 627 Data = 0x00; 628 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 629 mos7840_port->shadowLCR = Data; 630 631 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */ 632 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 633 634 Data = 0x0c; 635 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 636 637 Data = 0x0; 638 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 639 640 Data = 0x00; 641 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 642 643 Data = Data & ~SERIAL_LCR_DLAB; 644 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 645 mos7840_port->shadowLCR = Data; 646 647 /* clearing Bulkin and Bulkout Fifo */ 648 Data = 0x0; 649 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 650 651 Data = Data | 0x0c; 652 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 653 654 Data = Data & ~0x0c; 655 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 656 /* Finally enable all interrupts */ 657 Data = 0x0c; 658 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 659 660 /* clearing rx_disable */ 661 Data = 0x0; 662 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 663 &Data); 664 Data = Data & ~0x20; 665 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 666 Data); 667 668 /* rx_negate */ 669 Data = 0x0; 670 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 671 &Data); 672 Data = Data | 0x10; 673 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 674 Data); 675 676 dev_dbg(&port->dev, "port number is %d\n", port->port_number); 677 dev_dbg(&port->dev, "minor number is %d\n", port->minor); 678 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress); 679 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress); 680 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress); 681 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num); 682 mos7840_port->read_urb = port->read_urb; 683 684 /* set up our bulk in urb */ 685 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) { 686 usb_fill_bulk_urb(mos7840_port->read_urb, 687 serial->dev, 688 usb_rcvbulkpipe(serial->dev, 689 (port->bulk_in_endpointAddress) + 2), 690 port->bulk_in_buffer, 691 mos7840_port->read_urb->transfer_buffer_length, 692 mos7840_bulk_in_callback, mos7840_port); 693 } else { 694 usb_fill_bulk_urb(mos7840_port->read_urb, 695 serial->dev, 696 usb_rcvbulkpipe(serial->dev, 697 port->bulk_in_endpointAddress), 698 port->bulk_in_buffer, 699 mos7840_port->read_urb->transfer_buffer_length, 700 mos7840_bulk_in_callback, mos7840_port); 701 } 702 703 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress); 704 mos7840_port->read_urb_busy = true; 705 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 706 if (response) { 707 dev_err(&port->dev, "%s - Error %d submitting control urb\n", 708 __func__, response); 709 mos7840_port->read_urb_busy = false; 710 } 711 712 /* initialize our port settings */ 713 /* Must set to enable ints! */ 714 mos7840_port->shadowMCR = MCR_MASTER_IE; 715 716 return 0; 717 err: 718 for (j = 0; j < NUM_URBS; ++j) { 719 urb = mos7840_port->write_urb_pool[j]; 720 if (!urb) 721 continue; 722 kfree(urb->transfer_buffer); 723 usb_free_urb(urb); 724 } 725 return status; 726 } 727 728 /***************************************************************************** 729 * mos7840_chars_in_buffer 730 * this function is called by the tty driver when it wants to know how many 731 * bytes of data we currently have outstanding in the port (data that has 732 * been written, but hasn't made it out the port yet) 733 * If successful, we return the number of bytes left to be written in the 734 * system, 735 * Otherwise we return zero. 736 *****************************************************************************/ 737 738 static int mos7840_chars_in_buffer(struct tty_struct *tty) 739 { 740 struct usb_serial_port *port = tty->driver_data; 741 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 742 int i; 743 int chars = 0; 744 unsigned long flags; 745 746 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 747 for (i = 0; i < NUM_URBS; ++i) { 748 if (mos7840_port->busy[i]) { 749 struct urb *urb = mos7840_port->write_urb_pool[i]; 750 chars += urb->transfer_buffer_length; 751 } 752 } 753 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 754 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 755 return chars; 756 757 } 758 759 /***************************************************************************** 760 * mos7840_close 761 * this function is called by the tty driver when a port is closed 762 *****************************************************************************/ 763 764 static void mos7840_close(struct usb_serial_port *port) 765 { 766 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 767 int j; 768 __u16 Data; 769 770 for (j = 0; j < NUM_URBS; ++j) 771 usb_kill_urb(mos7840_port->write_urb_pool[j]); 772 773 /* Freeing Write URBs */ 774 for (j = 0; j < NUM_URBS; ++j) { 775 if (mos7840_port->write_urb_pool[j]) { 776 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer); 777 usb_free_urb(mos7840_port->write_urb_pool[j]); 778 } 779 } 780 781 usb_kill_urb(mos7840_port->read_urb); 782 mos7840_port->read_urb_busy = false; 783 784 Data = 0x0; 785 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 786 787 Data = 0x00; 788 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 789 } 790 791 /***************************************************************************** 792 * mos7840_break 793 * this function sends a break to the port 794 *****************************************************************************/ 795 static void mos7840_break(struct tty_struct *tty, int break_state) 796 { 797 struct usb_serial_port *port = tty->driver_data; 798 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 799 unsigned char data; 800 801 if (break_state == -1) 802 data = mos7840_port->shadowLCR | LCR_SET_BREAK; 803 else 804 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK; 805 806 /* FIXME: no locking on shadowLCR anywhere in driver */ 807 mos7840_port->shadowLCR = data; 808 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR); 809 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, 810 mos7840_port->shadowLCR); 811 } 812 813 /***************************************************************************** 814 * mos7840_write_room 815 * this function is called by the tty driver when it wants to know how many 816 * bytes of data we can accept for a specific port. 817 * If successful, we return the amount of room that we have for this port 818 * Otherwise we return a negative error number. 819 *****************************************************************************/ 820 821 static int mos7840_write_room(struct tty_struct *tty) 822 { 823 struct usb_serial_port *port = tty->driver_data; 824 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 825 int i; 826 int room = 0; 827 unsigned long flags; 828 829 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 830 for (i = 0; i < NUM_URBS; ++i) { 831 if (!mos7840_port->busy[i]) 832 room += URB_TRANSFER_BUFFER_SIZE; 833 } 834 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 835 836 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1; 837 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room); 838 return room; 839 840 } 841 842 /***************************************************************************** 843 * mos7840_write 844 * this function is called by the tty driver when data should be written to 845 * the port. 846 * If successful, we return the number of bytes written, otherwise we 847 * return a negative error number. 848 *****************************************************************************/ 849 850 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port, 851 const unsigned char *data, int count) 852 { 853 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 854 struct usb_serial *serial = port->serial; 855 int status; 856 int i; 857 int bytes_sent = 0; 858 int transfer_size; 859 unsigned long flags; 860 struct urb *urb; 861 /* __u16 Data; */ 862 const unsigned char *current_position = data; 863 864 /* try to find a free urb in the list */ 865 urb = NULL; 866 867 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 868 for (i = 0; i < NUM_URBS; ++i) { 869 if (!mos7840_port->busy[i]) { 870 mos7840_port->busy[i] = 1; 871 urb = mos7840_port->write_urb_pool[i]; 872 dev_dbg(&port->dev, "URB:%d\n", i); 873 break; 874 } 875 } 876 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 877 878 if (urb == NULL) { 879 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 880 goto exit; 881 } 882 883 if (urb->transfer_buffer == NULL) { 884 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 885 GFP_ATOMIC); 886 if (!urb->transfer_buffer) { 887 bytes_sent = -ENOMEM; 888 goto exit; 889 } 890 } 891 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 892 893 memcpy(urb->transfer_buffer, current_position, transfer_size); 894 895 /* fill urb with data and submit */ 896 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) { 897 usb_fill_bulk_urb(urb, 898 serial->dev, 899 usb_sndbulkpipe(serial->dev, 900 (port->bulk_out_endpointAddress) + 2), 901 urb->transfer_buffer, 902 transfer_size, 903 mos7840_bulk_out_data_callback, mos7840_port); 904 } else { 905 usb_fill_bulk_urb(urb, 906 serial->dev, 907 usb_sndbulkpipe(serial->dev, 908 port->bulk_out_endpointAddress), 909 urb->transfer_buffer, 910 transfer_size, 911 mos7840_bulk_out_data_callback, mos7840_port); 912 } 913 914 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress); 915 916 if (mos7840_port->has_led) 917 mos7840_led_activity(port); 918 919 /* send it down the pipe */ 920 status = usb_submit_urb(urb, GFP_ATOMIC); 921 922 if (status) { 923 mos7840_port->busy[i] = 0; 924 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 925 "with status = %d\n", __func__, status); 926 bytes_sent = status; 927 goto exit; 928 } 929 bytes_sent = transfer_size; 930 port->icount.tx += transfer_size; 931 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx); 932 exit: 933 return bytes_sent; 934 935 } 936 937 /***************************************************************************** 938 * mos7840_throttle 939 * this function is called by the tty driver when it wants to stop the data 940 * being read from the port. 941 *****************************************************************************/ 942 943 static void mos7840_throttle(struct tty_struct *tty) 944 { 945 struct usb_serial_port *port = tty->driver_data; 946 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 947 int status; 948 949 /* if we are implementing XON/XOFF, send the stop character */ 950 if (I_IXOFF(tty)) { 951 unsigned char stop_char = STOP_CHAR(tty); 952 status = mos7840_write(tty, port, &stop_char, 1); 953 if (status <= 0) 954 return; 955 } 956 /* if we are implementing RTS/CTS, toggle that line */ 957 if (C_CRTSCTS(tty)) { 958 mos7840_port->shadowMCR &= ~MCR_RTS; 959 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 960 mos7840_port->shadowMCR); 961 if (status < 0) 962 return; 963 } 964 } 965 966 /***************************************************************************** 967 * mos7840_unthrottle 968 * this function is called by the tty driver when it wants to resume 969 * the data being read from the port (called after mos7840_throttle is 970 * called) 971 *****************************************************************************/ 972 static void mos7840_unthrottle(struct tty_struct *tty) 973 { 974 struct usb_serial_port *port = tty->driver_data; 975 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 976 int status; 977 978 /* if we are implementing XON/XOFF, send the start character */ 979 if (I_IXOFF(tty)) { 980 unsigned char start_char = START_CHAR(tty); 981 status = mos7840_write(tty, port, &start_char, 1); 982 if (status <= 0) 983 return; 984 } 985 986 /* if we are implementing RTS/CTS, toggle that line */ 987 if (C_CRTSCTS(tty)) { 988 mos7840_port->shadowMCR |= MCR_RTS; 989 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 990 mos7840_port->shadowMCR); 991 if (status < 0) 992 return; 993 } 994 } 995 996 static int mos7840_tiocmget(struct tty_struct *tty) 997 { 998 struct usb_serial_port *port = tty->driver_data; 999 unsigned int result; 1000 __u16 msr; 1001 __u16 mcr; 1002 int status; 1003 1004 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr); 1005 if (status < 0) 1006 return -EIO; 1007 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr); 1008 if (status < 0) 1009 return -EIO; 1010 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) 1011 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0) 1012 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0) 1013 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) 1014 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) 1015 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) 1016 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); 1017 1018 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result); 1019 1020 return result; 1021 } 1022 1023 static int mos7840_tiocmset(struct tty_struct *tty, 1024 unsigned int set, unsigned int clear) 1025 { 1026 struct usb_serial_port *port = tty->driver_data; 1027 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 1028 unsigned int mcr; 1029 int status; 1030 1031 /* FIXME: What locks the port registers ? */ 1032 mcr = mos7840_port->shadowMCR; 1033 if (clear & TIOCM_RTS) 1034 mcr &= ~MCR_RTS; 1035 if (clear & TIOCM_DTR) 1036 mcr &= ~MCR_DTR; 1037 if (clear & TIOCM_LOOP) 1038 mcr &= ~MCR_LOOPBACK; 1039 1040 if (set & TIOCM_RTS) 1041 mcr |= MCR_RTS; 1042 if (set & TIOCM_DTR) 1043 mcr |= MCR_DTR; 1044 if (set & TIOCM_LOOP) 1045 mcr |= MCR_LOOPBACK; 1046 1047 mos7840_port->shadowMCR = mcr; 1048 1049 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr); 1050 if (status < 0) { 1051 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n"); 1052 return status; 1053 } 1054 1055 return 0; 1056 } 1057 1058 /***************************************************************************** 1059 * mos7840_calc_baud_rate_divisor 1060 * this function calculates the proper baud rate divisor for the specified 1061 * baud rate. 1062 *****************************************************************************/ 1063 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port, 1064 int baudRate, int *divisor, 1065 __u16 *clk_sel_val) 1066 { 1067 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate); 1068 1069 if (baudRate <= 115200) { 1070 *divisor = 115200 / baudRate; 1071 *clk_sel_val = 0x0; 1072 } 1073 if ((baudRate > 115200) && (baudRate <= 230400)) { 1074 *divisor = 230400 / baudRate; 1075 *clk_sel_val = 0x10; 1076 } else if ((baudRate > 230400) && (baudRate <= 403200)) { 1077 *divisor = 403200 / baudRate; 1078 *clk_sel_val = 0x20; 1079 } else if ((baudRate > 403200) && (baudRate <= 460800)) { 1080 *divisor = 460800 / baudRate; 1081 *clk_sel_val = 0x30; 1082 } else if ((baudRate > 460800) && (baudRate <= 806400)) { 1083 *divisor = 806400 / baudRate; 1084 *clk_sel_val = 0x40; 1085 } else if ((baudRate > 806400) && (baudRate <= 921600)) { 1086 *divisor = 921600 / baudRate; 1087 *clk_sel_val = 0x50; 1088 } else if ((baudRate > 921600) && (baudRate <= 1572864)) { 1089 *divisor = 1572864 / baudRate; 1090 *clk_sel_val = 0x60; 1091 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) { 1092 *divisor = 3145728 / baudRate; 1093 *clk_sel_val = 0x70; 1094 } 1095 return 0; 1096 } 1097 1098 /***************************************************************************** 1099 * mos7840_send_cmd_write_baud_rate 1100 * this function sends the proper command to change the baud rate of the 1101 * specified port. 1102 *****************************************************************************/ 1103 1104 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port, 1105 int baudRate) 1106 { 1107 struct usb_serial_port *port = mos7840_port->port; 1108 int divisor = 0; 1109 int status; 1110 __u16 Data; 1111 __u16 clk_sel_val; 1112 1113 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate); 1114 /* reset clk_uart_sel in spregOffset */ 1115 if (baudRate > 115200) { 1116 #ifdef HW_flow_control 1117 /* NOTE: need to see the pther register to modify */ 1118 /* setting h/w flow control bit to 1 */ 1119 Data = 0x2b; 1120 mos7840_port->shadowMCR = Data; 1121 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1122 Data); 1123 if (status < 0) { 1124 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1125 return -1; 1126 } 1127 #endif 1128 1129 } else { 1130 #ifdef HW_flow_control 1131 /* setting h/w flow control bit to 0 */ 1132 Data = 0xb; 1133 mos7840_port->shadowMCR = Data; 1134 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1135 Data); 1136 if (status < 0) { 1137 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1138 return -1; 1139 } 1140 #endif 1141 1142 } 1143 1144 if (1) { /* baudRate <= 115200) */ 1145 clk_sel_val = 0x0; 1146 Data = 0x0; 1147 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor, 1148 &clk_sel_val); 1149 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, 1150 &Data); 1151 if (status < 0) { 1152 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n"); 1153 return -1; 1154 } 1155 Data = (Data & 0x8f) | clk_sel_val; 1156 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, 1157 Data); 1158 if (status < 0) { 1159 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1160 return -1; 1161 } 1162 /* Calculate the Divisor */ 1163 1164 if (status) { 1165 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1166 return status; 1167 } 1168 /* Enable access to divisor latch */ 1169 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB; 1170 mos7840_port->shadowLCR = Data; 1171 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1172 1173 /* Write the divisor */ 1174 Data = (unsigned char)(divisor & 0xff); 1175 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data); 1176 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 1177 1178 Data = (unsigned char)((divisor & 0xff00) >> 8); 1179 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data); 1180 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 1181 1182 /* Disable access to divisor latch */ 1183 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB; 1184 mos7840_port->shadowLCR = Data; 1185 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1186 1187 } 1188 return status; 1189 } 1190 1191 /***************************************************************************** 1192 * mos7840_change_port_settings 1193 * This routine is called to set the UART on the device to match 1194 * the specified new settings. 1195 *****************************************************************************/ 1196 1197 static void mos7840_change_port_settings(struct tty_struct *tty, 1198 struct moschip_port *mos7840_port, struct ktermios *old_termios) 1199 { 1200 struct usb_serial_port *port = mos7840_port->port; 1201 int baud; 1202 unsigned cflag; 1203 __u8 lData; 1204 __u8 lParity; 1205 __u8 lStop; 1206 int status; 1207 __u16 Data; 1208 1209 lData = LCR_BITS_8; 1210 lStop = LCR_STOP_1; 1211 lParity = LCR_PAR_NONE; 1212 1213 cflag = tty->termios.c_cflag; 1214 1215 /* Change the number of bits */ 1216 switch (cflag & CSIZE) { 1217 case CS5: 1218 lData = LCR_BITS_5; 1219 break; 1220 1221 case CS6: 1222 lData = LCR_BITS_6; 1223 break; 1224 1225 case CS7: 1226 lData = LCR_BITS_7; 1227 break; 1228 1229 default: 1230 case CS8: 1231 lData = LCR_BITS_8; 1232 break; 1233 } 1234 1235 /* Change the Parity bit */ 1236 if (cflag & PARENB) { 1237 if (cflag & PARODD) { 1238 lParity = LCR_PAR_ODD; 1239 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1240 } else { 1241 lParity = LCR_PAR_EVEN; 1242 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1243 } 1244 1245 } else { 1246 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1247 } 1248 1249 if (cflag & CMSPAR) 1250 lParity = lParity | 0x20; 1251 1252 /* Change the Stop bit */ 1253 if (cflag & CSTOPB) { 1254 lStop = LCR_STOP_2; 1255 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1256 } else { 1257 lStop = LCR_STOP_1; 1258 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1259 } 1260 1261 /* Update the LCR with the correct value */ 1262 mos7840_port->shadowLCR &= 1263 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1264 mos7840_port->shadowLCR |= (lData | lParity | lStop); 1265 1266 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__, 1267 mos7840_port->shadowLCR); 1268 /* Disable Interrupts */ 1269 Data = 0x00; 1270 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1271 1272 Data = 0x00; 1273 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 1274 1275 Data = 0xcf; 1276 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 1277 1278 /* Send the updated LCR value to the mos7840 */ 1279 Data = mos7840_port->shadowLCR; 1280 1281 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1282 1283 Data = 0x00b; 1284 mos7840_port->shadowMCR = Data; 1285 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1286 Data = 0x00b; 1287 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1288 1289 /* set up the MCR register and send it to the mos7840 */ 1290 1291 mos7840_port->shadowMCR = MCR_MASTER_IE; 1292 if (cflag & CBAUD) 1293 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS); 1294 1295 if (cflag & CRTSCTS) 1296 mos7840_port->shadowMCR |= (MCR_XON_ANY); 1297 else 1298 mos7840_port->shadowMCR &= ~(MCR_XON_ANY); 1299 1300 Data = mos7840_port->shadowMCR; 1301 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1302 1303 /* Determine divisor based on baud rate */ 1304 baud = tty_get_baud_rate(tty); 1305 1306 if (!baud) { 1307 /* pick a default, any default... */ 1308 dev_dbg(&port->dev, "%s", "Picked default baud...\n"); 1309 baud = 9600; 1310 } 1311 1312 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1313 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud); 1314 1315 /* Enable Interrupts */ 1316 Data = 0x0c; 1317 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1318 1319 if (!mos7840_port->read_urb_busy) { 1320 mos7840_port->read_urb_busy = true; 1321 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1322 if (status) { 1323 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", 1324 status); 1325 mos7840_port->read_urb_busy = false; 1326 } 1327 } 1328 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__, 1329 mos7840_port->shadowLCR); 1330 } 1331 1332 /***************************************************************************** 1333 * mos7840_set_termios 1334 * this function is called by the tty driver when it wants to change 1335 * the termios structure 1336 *****************************************************************************/ 1337 1338 static void mos7840_set_termios(struct tty_struct *tty, 1339 struct usb_serial_port *port, 1340 struct ktermios *old_termios) 1341 { 1342 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 1343 int status; 1344 1345 /* change the port settings to the new ones specified */ 1346 1347 mos7840_change_port_settings(tty, mos7840_port, old_termios); 1348 1349 if (!mos7840_port->read_urb_busy) { 1350 mos7840_port->read_urb_busy = true; 1351 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1352 if (status) { 1353 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", 1354 status); 1355 mos7840_port->read_urb_busy = false; 1356 } 1357 } 1358 } 1359 1360 /***************************************************************************** 1361 * mos7840_get_lsr_info - get line status register info 1362 * 1363 * Purpose: Let user call ioctl() to get info when the UART physically 1364 * is emptied. On bus types like RS485, the transmitter must 1365 * release the bus after transmitting. This must be done when 1366 * the transmit shift register is empty, not be done when the 1367 * transmit holding register is empty. This functionality 1368 * allows an RS485 driver to be written in user space. 1369 *****************************************************************************/ 1370 1371 static int mos7840_get_lsr_info(struct tty_struct *tty, 1372 unsigned int __user *value) 1373 { 1374 int count; 1375 unsigned int result = 0; 1376 1377 count = mos7840_chars_in_buffer(tty); 1378 if (count == 0) 1379 result = TIOCSER_TEMT; 1380 1381 if (copy_to_user(value, &result, sizeof(int))) 1382 return -EFAULT; 1383 return 0; 1384 } 1385 1386 /***************************************************************************** 1387 * SerialIoctl 1388 * this function handles any ioctl calls to the driver 1389 *****************************************************************************/ 1390 1391 static int mos7840_ioctl(struct tty_struct *tty, 1392 unsigned int cmd, unsigned long arg) 1393 { 1394 struct usb_serial_port *port = tty->driver_data; 1395 void __user *argp = (void __user *)arg; 1396 1397 switch (cmd) { 1398 /* return number of bytes available */ 1399 1400 case TIOCSERGETLSR: 1401 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1402 return mos7840_get_lsr_info(tty, argp); 1403 1404 default: 1405 break; 1406 } 1407 return -ENOIOCTLCMD; 1408 } 1409 1410 /* 1411 * Check if GPO (pin 42) is connected to GPI (pin 33) as recommended by ASIX 1412 * for MCS7810 by bit-banging a 16-bit word. 1413 * 1414 * Note that GPO is really RTS of the third port so this will toggle RTS of 1415 * port two or three on two- and four-port devices. 1416 */ 1417 static int mos7810_check(struct usb_serial *serial) 1418 { 1419 int i, pass_count = 0; 1420 u8 *buf; 1421 __u16 data = 0, mcr_data = 0; 1422 __u16 test_pattern = 0x55AA; 1423 int res; 1424 1425 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 1426 if (!buf) 1427 return 0; /* failed to identify 7810 */ 1428 1429 /* Store MCR setting */ 1430 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 1431 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER, 1432 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 1433 if (res == VENDOR_READ_LENGTH) 1434 mcr_data = *buf; 1435 1436 for (i = 0; i < 16; i++) { 1437 /* Send the 1-bit test pattern out to MCS7810 test pin */ 1438 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1439 MCS_WRREQ, MCS_WR_RTYPE, 1440 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)), 1441 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT); 1442 1443 /* Read the test pattern back */ 1444 res = usb_control_msg(serial->dev, 1445 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ, 1446 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf, 1447 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 1448 if (res == VENDOR_READ_LENGTH) 1449 data = *buf; 1450 1451 /* If this is a MCS7810 device, both test patterns must match */ 1452 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001) 1453 break; 1454 1455 pass_count++; 1456 } 1457 1458 /* Restore MCR setting */ 1459 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ, 1460 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL, 1461 0, MOS_WDR_TIMEOUT); 1462 1463 kfree(buf); 1464 1465 if (pass_count == 16) 1466 return 1; 1467 1468 return 0; 1469 } 1470 1471 static int mos7840_probe(struct usb_serial *serial, 1472 const struct usb_device_id *id) 1473 { 1474 unsigned long device_flags = id->driver_info; 1475 u8 *buf; 1476 1477 /* Skip device-type detection if we already have device flags. */ 1478 if (device_flags) 1479 goto out; 1480 1481 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 1482 if (!buf) 1483 return -ENOMEM; 1484 1485 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 1486 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf, 1487 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 1488 1489 /* For a MCS7840 device GPIO0 must be set to 1 */ 1490 if (buf[0] & 0x01) 1491 device_flags = MCS_PORTS(4); 1492 else if (mos7810_check(serial)) 1493 device_flags = MCS_PORTS(1) | MCS_LED; 1494 else 1495 device_flags = MCS_PORTS(2); 1496 1497 kfree(buf); 1498 out: 1499 usb_set_serial_data(serial, (void *)device_flags); 1500 1501 return 0; 1502 } 1503 1504 static int mos7840_calc_num_ports(struct usb_serial *serial, 1505 struct usb_serial_endpoints *epds) 1506 { 1507 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial); 1508 int num_ports = MCS_PORTS(device_flags); 1509 1510 if (num_ports == 0 || num_ports > 4) 1511 return -ENODEV; 1512 1513 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) { 1514 dev_err(&serial->interface->dev, "missing endpoints\n"); 1515 return -ENODEV; 1516 } 1517 1518 return num_ports; 1519 } 1520 1521 static int mos7840_attach(struct usb_serial *serial) 1522 { 1523 struct device *dev = &serial->interface->dev; 1524 int status; 1525 u16 val; 1526 1527 /* Zero Length flag enable */ 1528 val = 0x0f; 1529 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, val); 1530 if (status < 0) 1531 dev_dbg(dev, "Writing ZLP_REG5 failed status-0x%x\n", status); 1532 else 1533 dev_dbg(dev, "ZLP_REG5 Writing success status%d\n", status); 1534 1535 return status; 1536 } 1537 1538 static int mos7840_port_probe(struct usb_serial_port *port) 1539 { 1540 struct usb_serial *serial = port->serial; 1541 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial); 1542 struct moschip_port *mos7840_port; 1543 int status; 1544 int pnum; 1545 __u16 Data; 1546 1547 /* we set up the pointers to the endpoints in the mos7840_open * 1548 * function, as the structures aren't created yet. */ 1549 1550 pnum = port->port_number; 1551 1552 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum); 1553 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL); 1554 if (!mos7840_port) 1555 return -ENOMEM; 1556 1557 /* Initialize all port interrupt end point to port 0 int 1558 * endpoint. Our device has only one interrupt end point 1559 * common to all port */ 1560 1561 mos7840_port->port = port; 1562 spin_lock_init(&mos7840_port->pool_lock); 1563 1564 /* minor is not initialised until later by 1565 * usb-serial.c:get_free_serial() and cannot therefore be used 1566 * to index device instances */ 1567 mos7840_port->port_num = pnum + 1; 1568 dev_dbg(&port->dev, "port->minor = %d\n", port->minor); 1569 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num); 1570 1571 if (mos7840_port->port_num == 1) { 1572 mos7840_port->SpRegOffset = 0x0; 1573 mos7840_port->ControlRegOffset = 0x1; 1574 mos7840_port->DcrRegOffset = 0x4; 1575 } else { 1576 u8 phy_num = mos7840_port->port_num; 1577 1578 /* Port 2 in the 2-port case uses registers of port 3 */ 1579 if (serial->num_ports == 2) 1580 phy_num = 3; 1581 1582 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2); 1583 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2); 1584 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2); 1585 } 1586 mos7840_dump_serial_port(port, mos7840_port); 1587 usb_set_serial_port_data(port, mos7840_port); 1588 1589 /* enable rx_disable bit in control register */ 1590 status = mos7840_get_reg_sync(port, 1591 mos7840_port->ControlRegOffset, &Data); 1592 if (status < 0) { 1593 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status); 1594 goto error; 1595 } else 1596 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status); 1597 Data |= 0x08; /* setting driver done bit */ 1598 Data |= 0x04; /* sp1_bit to have cts change reflect in 1599 modem status reg */ 1600 1601 /* Data |= 0x20; //rx_disable bit */ 1602 status = mos7840_set_reg_sync(port, 1603 mos7840_port->ControlRegOffset, Data); 1604 if (status < 0) { 1605 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status); 1606 goto error; 1607 } else 1608 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status); 1609 1610 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 1611 and 0x24 in DCR3 */ 1612 Data = 0x01; 1613 status = mos7840_set_reg_sync(port, 1614 (__u16) (mos7840_port->DcrRegOffset + 0), Data); 1615 if (status < 0) { 1616 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status); 1617 goto error; 1618 } else 1619 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status); 1620 1621 Data = 0x05; 1622 status = mos7840_set_reg_sync(port, 1623 (__u16) (mos7840_port->DcrRegOffset + 1), Data); 1624 if (status < 0) { 1625 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status); 1626 goto error; 1627 } else 1628 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status); 1629 1630 Data = 0x24; 1631 status = mos7840_set_reg_sync(port, 1632 (__u16) (mos7840_port->DcrRegOffset + 2), Data); 1633 if (status < 0) { 1634 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status); 1635 goto error; 1636 } else 1637 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status); 1638 1639 /* write values in clkstart0x0 and clkmulti 0x20 */ 1640 Data = 0x0; 1641 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data); 1642 if (status < 0) { 1643 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status); 1644 goto error; 1645 } else 1646 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status); 1647 1648 Data = 0x20; 1649 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data); 1650 if (status < 0) { 1651 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status); 1652 goto error; 1653 } else 1654 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status); 1655 1656 /* write value 0x0 to scratchpad register */ 1657 Data = 0x00; 1658 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data); 1659 if (status < 0) { 1660 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status); 1661 goto error; 1662 } else 1663 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status); 1664 1665 /* Zero Length flag register */ 1666 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) { 1667 Data = 0xff; 1668 status = mos7840_set_reg_sync(port, 1669 (__u16) (ZLP_REG1 + 1670 ((__u16)mos7840_port->port_num)), Data); 1671 dev_dbg(&port->dev, "ZLIP offset %x\n", 1672 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num))); 1673 if (status < 0) { 1674 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status); 1675 goto error; 1676 } else 1677 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status); 1678 } else { 1679 Data = 0xff; 1680 status = mos7840_set_reg_sync(port, 1681 (__u16) (ZLP_REG1 + 1682 ((__u16)mos7840_port->port_num) - 0x1), Data); 1683 dev_dbg(&port->dev, "ZLIP offset %x\n", 1684 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1)); 1685 if (status < 0) { 1686 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status); 1687 goto error; 1688 } else 1689 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status); 1690 1691 } 1692 1693 mos7840_port->has_led = device_flags & MCS_LED; 1694 1695 /* Initialize LED timers */ 1696 if (mos7840_port->has_led) { 1697 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL); 1698 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr), 1699 GFP_KERNEL); 1700 if (!mos7840_port->led_urb || !mos7840_port->led_dr) { 1701 status = -ENOMEM; 1702 goto error; 1703 } 1704 1705 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0); 1706 mos7840_port->led_timer1.expires = 1707 jiffies + msecs_to_jiffies(LED_ON_MS); 1708 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off, 1709 0); 1710 mos7840_port->led_timer2.expires = 1711 jiffies + msecs_to_jiffies(LED_OFF_MS); 1712 1713 /* Turn off LED */ 1714 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300); 1715 } 1716 1717 return 0; 1718 error: 1719 kfree(mos7840_port->led_dr); 1720 usb_free_urb(mos7840_port->led_urb); 1721 kfree(mos7840_port); 1722 1723 return status; 1724 } 1725 1726 static void mos7840_port_remove(struct usb_serial_port *port) 1727 { 1728 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 1729 1730 if (mos7840_port->has_led) { 1731 /* Turn off LED */ 1732 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300); 1733 1734 del_timer_sync(&mos7840_port->led_timer1); 1735 del_timer_sync(&mos7840_port->led_timer2); 1736 1737 usb_kill_urb(mos7840_port->led_urb); 1738 usb_free_urb(mos7840_port->led_urb); 1739 kfree(mos7840_port->led_dr); 1740 } 1741 1742 kfree(mos7840_port); 1743 } 1744 1745 static struct usb_serial_driver moschip7840_4port_device = { 1746 .driver = { 1747 .owner = THIS_MODULE, 1748 .name = "mos7840", 1749 }, 1750 .description = DRIVER_DESC, 1751 .id_table = id_table, 1752 .num_interrupt_in = 1, 1753 .open = mos7840_open, 1754 .close = mos7840_close, 1755 .write = mos7840_write, 1756 .write_room = mos7840_write_room, 1757 .chars_in_buffer = mos7840_chars_in_buffer, 1758 .throttle = mos7840_throttle, 1759 .unthrottle = mos7840_unthrottle, 1760 .calc_num_ports = mos7840_calc_num_ports, 1761 .probe = mos7840_probe, 1762 .attach = mos7840_attach, 1763 .ioctl = mos7840_ioctl, 1764 .set_termios = mos7840_set_termios, 1765 .break_ctl = mos7840_break, 1766 .tiocmget = mos7840_tiocmget, 1767 .tiocmset = mos7840_tiocmset, 1768 .get_icount = usb_serial_generic_get_icount, 1769 .port_probe = mos7840_port_probe, 1770 .port_remove = mos7840_port_remove, 1771 .read_bulk_callback = mos7840_bulk_in_callback, 1772 }; 1773 1774 static struct usb_serial_driver * const serial_drivers[] = { 1775 &moschip7840_4port_device, NULL 1776 }; 1777 1778 module_usb_serial_driver(serial_drivers, id_table); 1779 1780 MODULE_DESCRIPTION(DRIVER_DESC); 1781 MODULE_LICENSE("GPL"); 1782