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 /* vendor id and device id defines */ 93 94 /* The native mos7840/7820 component */ 95 #define USB_VENDOR_ID_MOSCHIP 0x9710 96 #define MOSCHIP_DEVICE_ID_7840 0x7840 97 #define MOSCHIP_DEVICE_ID_7820 0x7820 98 #define MOSCHIP_DEVICE_ID_7810 0x7810 99 /* The native component can have its vendor/device id's overridden 100 * in vendor-specific implementations. Such devices can be handled 101 * by making a change here, in id_table. 102 */ 103 #define USB_VENDOR_ID_BANDB 0x0856 104 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22 105 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00 106 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24 107 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01 108 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29 109 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30 110 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31 111 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32 112 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42 113 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02 114 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44 115 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03 116 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24 117 118 /* This driver also supports 119 * ATEN UC2324 device using Moschip MCS7840 120 * ATEN UC2322 device using Moschip MCS7820 121 */ 122 #define USB_VENDOR_ID_ATENINTL 0x0557 123 #define ATENINTL_DEVICE_ID_UC2324 0x2011 124 #define ATENINTL_DEVICE_ID_UC2322 0x7820 125 126 /* Interrupt Routine Defines */ 127 128 #define SERIAL_IIR_RLS 0x06 129 #define SERIAL_IIR_MS 0x00 130 131 /* 132 * Emulation of the bit mask on the LINE STATUS REGISTER. 133 */ 134 #define SERIAL_LSR_DR 0x0001 135 #define SERIAL_LSR_OE 0x0002 136 #define SERIAL_LSR_PE 0x0004 137 #define SERIAL_LSR_FE 0x0008 138 #define SERIAL_LSR_BI 0x0010 139 140 #define MOS_MSR_DELTA_CTS 0x10 141 #define MOS_MSR_DELTA_DSR 0x20 142 #define MOS_MSR_DELTA_RI 0x40 143 #define MOS_MSR_DELTA_CD 0x80 144 145 /* Serial Port register Address */ 146 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01)) 147 #define FIFO_CONTROL_REGISTER ((__u16)(0x02)) 148 #define LINE_CONTROL_REGISTER ((__u16)(0x03)) 149 #define MODEM_CONTROL_REGISTER ((__u16)(0x04)) 150 #define LINE_STATUS_REGISTER ((__u16)(0x05)) 151 #define MODEM_STATUS_REGISTER ((__u16)(0x06)) 152 #define SCRATCH_PAD_REGISTER ((__u16)(0x07)) 153 #define DIVISOR_LATCH_LSB ((__u16)(0x00)) 154 #define DIVISOR_LATCH_MSB ((__u16)(0x01)) 155 156 #define CLK_MULTI_REGISTER ((__u16)(0x02)) 157 #define CLK_START_VALUE_REGISTER ((__u16)(0x03)) 158 #define GPIO_REGISTER ((__u16)(0x07)) 159 160 #define SERIAL_LCR_DLAB ((__u16)(0x0080)) 161 162 /* 163 * URB POOL related defines 164 */ 165 #define NUM_URBS 16 /* URB Count */ 166 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 167 168 /* LED on/off milliseconds*/ 169 #define LED_ON_MS 500 170 #define LED_OFF_MS 500 171 172 enum mos7840_flag { 173 MOS7840_FLAG_CTRL_BUSY, 174 MOS7840_FLAG_LED_BUSY, 175 }; 176 177 static const struct usb_device_id id_table[] = { 178 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)}, 179 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)}, 180 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)}, 181 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)}, 182 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)}, 183 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)}, 184 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)}, 185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)}, 186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)}, 187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)}, 188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)}, 189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)}, 190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)}, 191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)}, 192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)}, 193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)}, 194 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)}, 195 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)}, 196 {} /* terminating entry */ 197 }; 198 MODULE_DEVICE_TABLE(usb, id_table); 199 200 /* This structure holds all of the local port information */ 201 202 struct moschip_port { 203 int port_num; /*Actual port number in the device(1,2,etc) */ 204 struct urb *read_urb; /* read URB for this port */ 205 __u8 shadowLCR; /* last LCR value received */ 206 __u8 shadowMCR; /* last MCR value received */ 207 char open; 208 char open_ports; 209 struct usb_serial_port *port; /* loop back to the owner of this object */ 210 211 /* Offsets */ 212 __u8 SpRegOffset; 213 __u8 ControlRegOffset; 214 __u8 DcrRegOffset; 215 /* for processing control URBS in interrupt context */ 216 struct urb *control_urb; 217 struct usb_ctrlrequest *dr; 218 char *ctrl_buf; 219 int MsrLsr; 220 221 spinlock_t pool_lock; 222 struct urb *write_urb_pool[NUM_URBS]; 223 char busy[NUM_URBS]; 224 bool read_urb_busy; 225 226 /* For device(s) with LED indicator */ 227 bool has_led; 228 struct timer_list led_timer1; /* Timer for LED on */ 229 struct timer_list led_timer2; /* Timer for LED off */ 230 struct urb *led_urb; 231 struct usb_ctrlrequest *led_dr; 232 233 unsigned long flags; 234 }; 235 236 /* 237 * mos7840_set_reg_sync 238 * To set the Control register by calling usb_fill_control_urb function 239 * by passing usb_sndctrlpipe function as parameter. 240 */ 241 242 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg, 243 __u16 val) 244 { 245 struct usb_device *dev = port->serial->dev; 246 val = val & 0x00ff; 247 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val); 248 249 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 250 MCS_WR_RTYPE, val, reg, NULL, 0, 251 MOS_WDR_TIMEOUT); 252 } 253 254 /* 255 * mos7840_get_reg_sync 256 * To set the Uart register by calling usb_fill_control_urb function by 257 * passing usb_rcvctrlpipe function as parameter. 258 */ 259 260 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg, 261 __u16 *val) 262 { 263 struct usb_device *dev = port->serial->dev; 264 int ret = 0; 265 u8 *buf; 266 267 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 268 if (!buf) 269 return -ENOMEM; 270 271 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 272 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH, 273 MOS_WDR_TIMEOUT); 274 if (ret < VENDOR_READ_LENGTH) { 275 if (ret >= 0) 276 ret = -EIO; 277 goto out; 278 } 279 280 *val = buf[0]; 281 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val); 282 out: 283 kfree(buf); 284 return ret; 285 } 286 287 /* 288 * mos7840_set_uart_reg 289 * To set the Uart register by calling usb_fill_control_urb function by 290 * passing usb_sndctrlpipe function as parameter. 291 */ 292 293 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg, 294 __u16 val) 295 { 296 297 struct usb_device *dev = port->serial->dev; 298 val = val & 0x00ff; 299 /* For the UART control registers, the application number need 300 to be Or'ed */ 301 if (port->serial->num_ports == 4) { 302 val |= ((__u16)port->port_number + 1) << 8; 303 } else { 304 if (port->port_number == 0) { 305 val |= ((__u16)port->port_number + 1) << 8; 306 } else { 307 val |= ((__u16)port->port_number + 2) << 8; 308 } 309 } 310 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val); 311 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 312 MCS_WR_RTYPE, val, reg, NULL, 0, 313 MOS_WDR_TIMEOUT); 314 315 } 316 317 /* 318 * mos7840_get_uart_reg 319 * To set the Control register by calling usb_fill_control_urb function 320 * by passing usb_rcvctrlpipe function as parameter. 321 */ 322 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg, 323 __u16 *val) 324 { 325 struct usb_device *dev = port->serial->dev; 326 int ret = 0; 327 __u16 Wval; 328 u8 *buf; 329 330 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 331 if (!buf) 332 return -ENOMEM; 333 334 /* Wval is same as application number */ 335 if (port->serial->num_ports == 4) { 336 Wval = ((__u16)port->port_number + 1) << 8; 337 } else { 338 if (port->port_number == 0) { 339 Wval = ((__u16)port->port_number + 1) << 8; 340 } else { 341 Wval = ((__u16)port->port_number + 2) << 8; 342 } 343 } 344 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval); 345 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 346 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH, 347 MOS_WDR_TIMEOUT); 348 if (ret < VENDOR_READ_LENGTH) { 349 if (ret >= 0) 350 ret = -EIO; 351 goto out; 352 } 353 *val = buf[0]; 354 out: 355 kfree(buf); 356 return ret; 357 } 358 359 static void mos7840_dump_serial_port(struct usb_serial_port *port, 360 struct moschip_port *mos7840_port) 361 { 362 363 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset); 364 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset); 365 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset); 366 367 } 368 369 /************************************************************************/ 370 /************************************************************************/ 371 /* I N T E R F A C E F U N C T I O N S */ 372 /* I N T E R F A C E F U N C T I O N S */ 373 /************************************************************************/ 374 /************************************************************************/ 375 376 static inline void mos7840_set_port_private(struct usb_serial_port *port, 377 struct moschip_port *data) 378 { 379 usb_set_serial_port_data(port, (void *)data); 380 } 381 382 static inline struct moschip_port *mos7840_get_port_private(struct 383 usb_serial_port 384 *port) 385 { 386 return (struct moschip_port *)usb_get_serial_port_data(port); 387 } 388 389 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr) 390 { 391 struct moschip_port *mos7840_port; 392 struct async_icount *icount; 393 mos7840_port = port; 394 if (new_msr & 395 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI | 396 MOS_MSR_DELTA_CD)) { 397 icount = &mos7840_port->port->icount; 398 399 /* update input line counters */ 400 if (new_msr & MOS_MSR_DELTA_CTS) 401 icount->cts++; 402 if (new_msr & MOS_MSR_DELTA_DSR) 403 icount->dsr++; 404 if (new_msr & MOS_MSR_DELTA_CD) 405 icount->dcd++; 406 if (new_msr & MOS_MSR_DELTA_RI) 407 icount->rng++; 408 409 wake_up_interruptible(&port->port->port.delta_msr_wait); 410 } 411 } 412 413 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr) 414 { 415 struct async_icount *icount; 416 417 if (new_lsr & SERIAL_LSR_BI) { 418 /* 419 * Parity and Framing errors only count if they 420 * occur exclusive of a break being 421 * received. 422 */ 423 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI); 424 } 425 426 /* update input line counters */ 427 icount = &port->port->icount; 428 if (new_lsr & SERIAL_LSR_BI) 429 icount->brk++; 430 if (new_lsr & SERIAL_LSR_OE) 431 icount->overrun++; 432 if (new_lsr & SERIAL_LSR_PE) 433 icount->parity++; 434 if (new_lsr & SERIAL_LSR_FE) 435 icount->frame++; 436 } 437 438 /************************************************************************/ 439 /************************************************************************/ 440 /* U S B C A L L B A C K F U N C T I O N S */ 441 /* U S B C A L L B A C K F U N C T I O N S */ 442 /************************************************************************/ 443 /************************************************************************/ 444 445 static void mos7840_control_callback(struct urb *urb) 446 { 447 unsigned char *data; 448 struct moschip_port *mos7840_port; 449 struct device *dev = &urb->dev->dev; 450 __u8 regval = 0x0; 451 int status = urb->status; 452 453 mos7840_port = urb->context; 454 455 switch (status) { 456 case 0: 457 /* success */ 458 break; 459 case -ECONNRESET: 460 case -ENOENT: 461 case -ESHUTDOWN: 462 /* this urb is terminated, clean up */ 463 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 464 goto out; 465 default: 466 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 467 goto out; 468 } 469 470 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length); 471 if (urb->actual_length < 1) 472 goto out; 473 474 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__, 475 mos7840_port->MsrLsr, mos7840_port->port_num); 476 data = urb->transfer_buffer; 477 regval = (__u8) data[0]; 478 dev_dbg(dev, "%s data is %x\n", __func__, regval); 479 if (mos7840_port->MsrLsr == 0) 480 mos7840_handle_new_msr(mos7840_port, regval); 481 else if (mos7840_port->MsrLsr == 1) 482 mos7840_handle_new_lsr(mos7840_port, regval); 483 out: 484 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags); 485 } 486 487 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg, 488 __u16 *val) 489 { 490 struct usb_device *dev = mcs->port->serial->dev; 491 struct usb_ctrlrequest *dr = mcs->dr; 492 unsigned char *buffer = mcs->ctrl_buf; 493 int ret; 494 495 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags)) 496 return -EBUSY; 497 498 dr->bRequestType = MCS_RD_RTYPE; 499 dr->bRequest = MCS_RDREQ; 500 dr->wValue = cpu_to_le16(Wval); /* 0 */ 501 dr->wIndex = cpu_to_le16(reg); 502 dr->wLength = cpu_to_le16(2); 503 504 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0), 505 (unsigned char *)dr, buffer, 2, 506 mos7840_control_callback, mcs); 507 mcs->control_urb->transfer_buffer_length = 2; 508 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC); 509 if (ret) 510 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags); 511 512 return ret; 513 } 514 515 static void mos7840_set_led_callback(struct urb *urb) 516 { 517 switch (urb->status) { 518 case 0: 519 /* Success */ 520 break; 521 case -ECONNRESET: 522 case -ENOENT: 523 case -ESHUTDOWN: 524 /* This urb is terminated, clean up */ 525 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n", 526 __func__, urb->status); 527 break; 528 default: 529 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", 530 __func__, urb->status); 531 } 532 } 533 534 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval, 535 __u16 reg) 536 { 537 struct usb_device *dev = mcs->port->serial->dev; 538 struct usb_ctrlrequest *dr = mcs->led_dr; 539 540 dr->bRequestType = MCS_WR_RTYPE; 541 dr->bRequest = MCS_WRREQ; 542 dr->wValue = cpu_to_le16(wval); 543 dr->wIndex = cpu_to_le16(reg); 544 dr->wLength = cpu_to_le16(0); 545 546 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0), 547 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL); 548 549 usb_submit_urb(mcs->led_urb, GFP_ATOMIC); 550 } 551 552 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg, 553 __u16 val) 554 { 555 struct usb_device *dev = port->serial->dev; 556 557 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE, 558 val, reg, NULL, 0, MOS_WDR_TIMEOUT); 559 } 560 561 static void mos7840_led_off(struct timer_list *t) 562 { 563 struct moschip_port *mcs = from_timer(mcs, t, led_timer1); 564 565 /* Turn off LED */ 566 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER); 567 mod_timer(&mcs->led_timer2, 568 jiffies + msecs_to_jiffies(LED_OFF_MS)); 569 } 570 571 static void mos7840_led_flag_off(struct timer_list *t) 572 { 573 struct moschip_port *mcs = from_timer(mcs, t, led_timer2); 574 575 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags); 576 } 577 578 static void mos7840_led_activity(struct usb_serial_port *port) 579 { 580 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 581 582 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags)) 583 return; 584 585 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER); 586 mod_timer(&mos7840_port->led_timer1, 587 jiffies + msecs_to_jiffies(LED_ON_MS)); 588 } 589 590 /***************************************************************************** 591 * mos7840_interrupt_callback 592 * this is the callback function for when we have received data on the 593 * interrupt endpoint. 594 *****************************************************************************/ 595 596 static void mos7840_interrupt_callback(struct urb *urb) 597 { 598 int result; 599 int length; 600 struct moschip_port *mos7840_port; 601 struct usb_serial *serial; 602 __u16 Data; 603 unsigned char *data; 604 __u8 sp[5], st; 605 int i, rv = 0; 606 __u16 wval, wreg = 0; 607 int status = urb->status; 608 609 switch (status) { 610 case 0: 611 /* success */ 612 break; 613 case -ECONNRESET: 614 case -ENOENT: 615 case -ESHUTDOWN: 616 /* this urb is terminated, clean up */ 617 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n", 618 __func__, status); 619 return; 620 default: 621 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", 622 __func__, status); 623 goto exit; 624 } 625 626 length = urb->actual_length; 627 data = urb->transfer_buffer; 628 629 serial = urb->context; 630 631 /* Moschip get 5 bytes 632 * Byte 1 IIR Port 1 (port.number is 0) 633 * Byte 2 IIR Port 2 (port.number is 1) 634 * Byte 3 IIR Port 3 (port.number is 2) 635 * Byte 4 IIR Port 4 (port.number is 3) 636 * Byte 5 FIFO status for both */ 637 638 if (length > 5) { 639 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n"); 640 return; 641 } 642 643 sp[0] = (__u8) data[0]; 644 sp[1] = (__u8) data[1]; 645 sp[2] = (__u8) data[2]; 646 sp[3] = (__u8) data[3]; 647 st = (__u8) data[4]; 648 649 for (i = 0; i < serial->num_ports; i++) { 650 mos7840_port = mos7840_get_port_private(serial->port[i]); 651 wval = ((__u16)serial->port[i]->port_number + 1) << 8; 652 if (mos7840_port->open) { 653 if (sp[i] & 0x01) { 654 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i); 655 } else { 656 switch (sp[i] & 0x0f) { 657 case SERIAL_IIR_RLS: 658 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i); 659 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n"); 660 mos7840_port->MsrLsr = 1; 661 wreg = LINE_STATUS_REGISTER; 662 break; 663 case SERIAL_IIR_MS: 664 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i); 665 mos7840_port->MsrLsr = 0; 666 wreg = MODEM_STATUS_REGISTER; 667 break; 668 } 669 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data); 670 } 671 } 672 } 673 if (!(rv < 0)) 674 /* the completion handler for the control urb will resubmit */ 675 return; 676 exit: 677 result = usb_submit_urb(urb, GFP_ATOMIC); 678 if (result) { 679 dev_err(&urb->dev->dev, 680 "%s - Error %d submitting interrupt urb\n", 681 __func__, result); 682 } 683 } 684 685 static int mos7840_port_paranoia_check(struct usb_serial_port *port, 686 const char *function) 687 { 688 if (!port) { 689 pr_debug("%s - port == NULL\n", function); 690 return -1; 691 } 692 if (!port->serial) { 693 pr_debug("%s - port->serial == NULL\n", function); 694 return -1; 695 } 696 697 return 0; 698 } 699 700 /* Inline functions to check the sanity of a pointer that is passed to us */ 701 static int mos7840_serial_paranoia_check(struct usb_serial *serial, 702 const char *function) 703 { 704 if (!serial) { 705 pr_debug("%s - serial == NULL\n", function); 706 return -1; 707 } 708 if (!serial->type) { 709 pr_debug("%s - serial->type == NULL!\n", function); 710 return -1; 711 } 712 713 return 0; 714 } 715 716 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port, 717 const char *function) 718 { 719 /* if no port was specified, or it fails a paranoia check */ 720 if (!port || 721 mos7840_port_paranoia_check(port, function) || 722 mos7840_serial_paranoia_check(port->serial, function)) { 723 /* then say that we don't have a valid usb_serial thing, 724 * which will end up genrating -ENODEV return values */ 725 return NULL; 726 } 727 728 return port->serial; 729 } 730 731 /***************************************************************************** 732 * mos7840_bulk_in_callback 733 * this is the callback function for when we have received data on the 734 * bulk in endpoint. 735 *****************************************************************************/ 736 737 static void mos7840_bulk_in_callback(struct urb *urb) 738 { 739 int retval; 740 unsigned char *data; 741 struct usb_serial *serial; 742 struct usb_serial_port *port; 743 struct moschip_port *mos7840_port; 744 int status = urb->status; 745 746 mos7840_port = urb->context; 747 if (!mos7840_port) 748 return; 749 750 if (status) { 751 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 752 mos7840_port->read_urb_busy = false; 753 return; 754 } 755 756 port = mos7840_port->port; 757 if (mos7840_port_paranoia_check(port, __func__)) { 758 mos7840_port->read_urb_busy = false; 759 return; 760 } 761 762 serial = mos7840_get_usb_serial(port, __func__); 763 if (!serial) { 764 mos7840_port->read_urb_busy = false; 765 return; 766 } 767 768 data = urb->transfer_buffer; 769 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 770 771 if (urb->actual_length) { 772 struct tty_port *tport = &mos7840_port->port->port; 773 tty_insert_flip_string(tport, data, urb->actual_length); 774 tty_flip_buffer_push(tport); 775 port->icount.rx += urb->actual_length; 776 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx); 777 } 778 779 if (!mos7840_port->read_urb) { 780 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n"); 781 mos7840_port->read_urb_busy = false; 782 return; 783 } 784 785 if (mos7840_port->has_led) 786 mos7840_led_activity(port); 787 788 mos7840_port->read_urb_busy = true; 789 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 790 791 if (retval) { 792 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 793 mos7840_port->read_urb_busy = false; 794 } 795 } 796 797 /***************************************************************************** 798 * mos7840_bulk_out_data_callback 799 * this is the callback function for when we have finished sending 800 * serial data on the bulk out endpoint. 801 *****************************************************************************/ 802 803 static void mos7840_bulk_out_data_callback(struct urb *urb) 804 { 805 struct moschip_port *mos7840_port; 806 struct usb_serial_port *port; 807 int status = urb->status; 808 unsigned long flags; 809 int i; 810 811 mos7840_port = urb->context; 812 port = mos7840_port->port; 813 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 814 for (i = 0; i < NUM_URBS; i++) { 815 if (urb == mos7840_port->write_urb_pool[i]) { 816 mos7840_port->busy[i] = 0; 817 break; 818 } 819 } 820 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 821 822 if (status) { 823 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status); 824 return; 825 } 826 827 if (mos7840_port_paranoia_check(port, __func__)) 828 return; 829 830 if (mos7840_port->open) 831 tty_port_tty_wakeup(&port->port); 832 833 } 834 835 /************************************************************************/ 836 /* 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 */ 837 /************************************************************************/ 838 839 /***************************************************************************** 840 * mos7840_open 841 * this function is called by the tty driver when a port is opened 842 * If successful, we return 0 843 * Otherwise we return a negative error number. 844 *****************************************************************************/ 845 846 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port) 847 { 848 int response; 849 int j; 850 struct usb_serial *serial; 851 struct urb *urb; 852 __u16 Data; 853 int status; 854 struct moschip_port *mos7840_port; 855 struct moschip_port *port0; 856 857 if (mos7840_port_paranoia_check(port, __func__)) 858 return -ENODEV; 859 860 serial = port->serial; 861 862 if (mos7840_serial_paranoia_check(serial, __func__)) 863 return -ENODEV; 864 865 mos7840_port = mos7840_get_port_private(port); 866 port0 = mos7840_get_port_private(serial->port[0]); 867 868 if (mos7840_port == NULL || port0 == NULL) 869 return -ENODEV; 870 871 usb_clear_halt(serial->dev, port->write_urb->pipe); 872 usb_clear_halt(serial->dev, port->read_urb->pipe); 873 port0->open_ports++; 874 875 /* Initialising the write urb pool */ 876 for (j = 0; j < NUM_URBS; ++j) { 877 urb = usb_alloc_urb(0, GFP_KERNEL); 878 mos7840_port->write_urb_pool[j] = urb; 879 if (!urb) 880 continue; 881 882 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 883 GFP_KERNEL); 884 if (!urb->transfer_buffer) { 885 usb_free_urb(urb); 886 mos7840_port->write_urb_pool[j] = NULL; 887 continue; 888 } 889 } 890 891 /***************************************************************************** 892 * Initialize MCS7840 -- Write Init values to corresponding Registers 893 * 894 * Register Index 895 * 1 : IER 896 * 2 : FCR 897 * 3 : LCR 898 * 4 : MCR 899 * 900 * 0x08 : SP1/2 Control Reg 901 *****************************************************************************/ 902 903 /* NEED to check the following Block */ 904 905 Data = 0x0; 906 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 907 if (status < 0) { 908 dev_dbg(&port->dev, "Reading Spreg failed\n"); 909 goto err; 910 } 911 Data |= 0x80; 912 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 913 if (status < 0) { 914 dev_dbg(&port->dev, "writing Spreg failed\n"); 915 goto err; 916 } 917 918 Data &= ~0x80; 919 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 920 if (status < 0) { 921 dev_dbg(&port->dev, "writing Spreg failed\n"); 922 goto err; 923 } 924 /* End of block to be checked */ 925 926 Data = 0x0; 927 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 928 &Data); 929 if (status < 0) { 930 dev_dbg(&port->dev, "Reading Controlreg failed\n"); 931 goto err; 932 } 933 Data |= 0x08; /* Driver done bit */ 934 Data |= 0x20; /* rx_disable */ 935 status = mos7840_set_reg_sync(port, 936 mos7840_port->ControlRegOffset, Data); 937 if (status < 0) { 938 dev_dbg(&port->dev, "writing Controlreg failed\n"); 939 goto err; 940 } 941 /* do register settings here */ 942 /* Set all regs to the device default values. */ 943 /*********************************** 944 * First Disable all interrupts. 945 ***********************************/ 946 Data = 0x00; 947 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 948 if (status < 0) { 949 dev_dbg(&port->dev, "disabling interrupts failed\n"); 950 goto err; 951 } 952 /* Set FIFO_CONTROL_REGISTER to the default value */ 953 Data = 0x00; 954 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 955 if (status < 0) { 956 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n"); 957 goto err; 958 } 959 960 Data = 0xcf; 961 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 962 if (status < 0) { 963 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n"); 964 goto err; 965 } 966 967 Data = 0x03; 968 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 969 mos7840_port->shadowLCR = Data; 970 971 Data = 0x0b; 972 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 973 mos7840_port->shadowMCR = Data; 974 975 Data = 0x00; 976 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 977 mos7840_port->shadowLCR = Data; 978 979 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */ 980 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 981 982 Data = 0x0c; 983 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 984 985 Data = 0x0; 986 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 987 988 Data = 0x00; 989 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 990 991 Data = Data & ~SERIAL_LCR_DLAB; 992 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 993 mos7840_port->shadowLCR = Data; 994 995 /* clearing Bulkin and Bulkout Fifo */ 996 Data = 0x0; 997 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 998 999 Data = Data | 0x0c; 1000 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 1001 1002 Data = Data & ~0x0c; 1003 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 1004 /* Finally enable all interrupts */ 1005 Data = 0x0c; 1006 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1007 1008 /* clearing rx_disable */ 1009 Data = 0x0; 1010 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 1011 &Data); 1012 Data = Data & ~0x20; 1013 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 1014 Data); 1015 1016 /* rx_negate */ 1017 Data = 0x0; 1018 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 1019 &Data); 1020 Data = Data | 0x10; 1021 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 1022 Data); 1023 1024 /* Check to see if we've set up our endpoint info yet * 1025 * (can't set it up in mos7840_startup as the structures * 1026 * were not set up at that time.) */ 1027 if (port0->open_ports == 1) { 1028 /* FIXME: Buffer never NULL, so URB is not submitted. */ 1029 if (serial->port[0]->interrupt_in_buffer == NULL) { 1030 /* set up interrupt urb */ 1031 usb_fill_int_urb(serial->port[0]->interrupt_in_urb, 1032 serial->dev, 1033 usb_rcvintpipe(serial->dev, 1034 serial->port[0]->interrupt_in_endpointAddress), 1035 serial->port[0]->interrupt_in_buffer, 1036 serial->port[0]->interrupt_in_urb-> 1037 transfer_buffer_length, 1038 mos7840_interrupt_callback, 1039 serial, 1040 serial->port[0]->interrupt_in_urb->interval); 1041 1042 /* start interrupt read for mos7840 */ 1043 response = 1044 usb_submit_urb(serial->port[0]->interrupt_in_urb, 1045 GFP_KERNEL); 1046 if (response) { 1047 dev_err(&port->dev, "%s - Error %d submitting " 1048 "interrupt urb\n", __func__, response); 1049 } 1050 1051 } 1052 1053 } 1054 1055 /* see if we've set up our endpoint info yet * 1056 * (can't set it up in mos7840_startup as the * 1057 * structures were not set up at that time.) */ 1058 1059 dev_dbg(&port->dev, "port number is %d\n", port->port_number); 1060 dev_dbg(&port->dev, "minor number is %d\n", port->minor); 1061 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress); 1062 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress); 1063 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress); 1064 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num); 1065 mos7840_port->read_urb = port->read_urb; 1066 1067 /* set up our bulk in urb */ 1068 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) { 1069 usb_fill_bulk_urb(mos7840_port->read_urb, 1070 serial->dev, 1071 usb_rcvbulkpipe(serial->dev, 1072 (port->bulk_in_endpointAddress) + 2), 1073 port->bulk_in_buffer, 1074 mos7840_port->read_urb->transfer_buffer_length, 1075 mos7840_bulk_in_callback, mos7840_port); 1076 } else { 1077 usb_fill_bulk_urb(mos7840_port->read_urb, 1078 serial->dev, 1079 usb_rcvbulkpipe(serial->dev, 1080 port->bulk_in_endpointAddress), 1081 port->bulk_in_buffer, 1082 mos7840_port->read_urb->transfer_buffer_length, 1083 mos7840_bulk_in_callback, mos7840_port); 1084 } 1085 1086 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress); 1087 mos7840_port->read_urb_busy = true; 1088 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1089 if (response) { 1090 dev_err(&port->dev, "%s - Error %d submitting control urb\n", 1091 __func__, response); 1092 mos7840_port->read_urb_busy = false; 1093 } 1094 1095 /* initialize our port settings */ 1096 /* Must set to enable ints! */ 1097 mos7840_port->shadowMCR = MCR_MASTER_IE; 1098 /* send a open port command */ 1099 mos7840_port->open = 1; 1100 /* mos7840_change_port_settings(mos7840_port,old_termios); */ 1101 1102 return 0; 1103 err: 1104 for (j = 0; j < NUM_URBS; ++j) { 1105 urb = mos7840_port->write_urb_pool[j]; 1106 if (!urb) 1107 continue; 1108 kfree(urb->transfer_buffer); 1109 usb_free_urb(urb); 1110 } 1111 return status; 1112 } 1113 1114 /***************************************************************************** 1115 * mos7840_chars_in_buffer 1116 * this function is called by the tty driver when it wants to know how many 1117 * bytes of data we currently have outstanding in the port (data that has 1118 * been written, but hasn't made it out the port yet) 1119 * If successful, we return the number of bytes left to be written in the 1120 * system, 1121 * Otherwise we return zero. 1122 *****************************************************************************/ 1123 1124 static int mos7840_chars_in_buffer(struct tty_struct *tty) 1125 { 1126 struct usb_serial_port *port = tty->driver_data; 1127 int i; 1128 int chars = 0; 1129 unsigned long flags; 1130 struct moschip_port *mos7840_port; 1131 1132 if (mos7840_port_paranoia_check(port, __func__)) 1133 return 0; 1134 1135 mos7840_port = mos7840_get_port_private(port); 1136 if (mos7840_port == NULL) 1137 return 0; 1138 1139 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1140 for (i = 0; i < NUM_URBS; ++i) { 1141 if (mos7840_port->busy[i]) { 1142 struct urb *urb = mos7840_port->write_urb_pool[i]; 1143 chars += urb->transfer_buffer_length; 1144 } 1145 } 1146 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1147 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1148 return chars; 1149 1150 } 1151 1152 /***************************************************************************** 1153 * mos7840_close 1154 * this function is called by the tty driver when a port is closed 1155 *****************************************************************************/ 1156 1157 static void mos7840_close(struct usb_serial_port *port) 1158 { 1159 struct usb_serial *serial; 1160 struct moschip_port *mos7840_port; 1161 struct moschip_port *port0; 1162 int j; 1163 __u16 Data; 1164 1165 if (mos7840_port_paranoia_check(port, __func__)) 1166 return; 1167 1168 serial = mos7840_get_usb_serial(port, __func__); 1169 if (!serial) 1170 return; 1171 1172 mos7840_port = mos7840_get_port_private(port); 1173 port0 = mos7840_get_port_private(serial->port[0]); 1174 1175 if (mos7840_port == NULL || port0 == NULL) 1176 return; 1177 1178 for (j = 0; j < NUM_URBS; ++j) 1179 usb_kill_urb(mos7840_port->write_urb_pool[j]); 1180 1181 /* Freeing Write URBs */ 1182 for (j = 0; j < NUM_URBS; ++j) { 1183 if (mos7840_port->write_urb_pool[j]) { 1184 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer); 1185 usb_free_urb(mos7840_port->write_urb_pool[j]); 1186 } 1187 } 1188 1189 usb_kill_urb(mos7840_port->read_urb); 1190 mos7840_port->read_urb_busy = false; 1191 1192 port0->open_ports--; 1193 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports); 1194 if (port0->open_ports == 0) { 1195 if (serial->port[0]->interrupt_in_urb) { 1196 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n"); 1197 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1198 } 1199 } 1200 1201 Data = 0x0; 1202 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1203 1204 Data = 0x00; 1205 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1206 1207 mos7840_port->open = 0; 1208 } 1209 1210 /***************************************************************************** 1211 * mos7840_break 1212 * this function sends a break to the port 1213 *****************************************************************************/ 1214 static void mos7840_break(struct tty_struct *tty, int break_state) 1215 { 1216 struct usb_serial_port *port = tty->driver_data; 1217 unsigned char data; 1218 struct usb_serial *serial; 1219 struct moschip_port *mos7840_port; 1220 1221 if (mos7840_port_paranoia_check(port, __func__)) 1222 return; 1223 1224 serial = mos7840_get_usb_serial(port, __func__); 1225 if (!serial) 1226 return; 1227 1228 mos7840_port = mos7840_get_port_private(port); 1229 1230 if (mos7840_port == NULL) 1231 return; 1232 1233 if (break_state == -1) 1234 data = mos7840_port->shadowLCR | LCR_SET_BREAK; 1235 else 1236 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK; 1237 1238 /* FIXME: no locking on shadowLCR anywhere in driver */ 1239 mos7840_port->shadowLCR = data; 1240 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR); 1241 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, 1242 mos7840_port->shadowLCR); 1243 } 1244 1245 /***************************************************************************** 1246 * mos7840_write_room 1247 * this function is called by the tty driver when it wants to know how many 1248 * bytes of data we can accept for a specific port. 1249 * If successful, we return the amount of room that we have for this port 1250 * Otherwise we return a negative error number. 1251 *****************************************************************************/ 1252 1253 static int mos7840_write_room(struct tty_struct *tty) 1254 { 1255 struct usb_serial_port *port = tty->driver_data; 1256 int i; 1257 int room = 0; 1258 unsigned long flags; 1259 struct moschip_port *mos7840_port; 1260 1261 if (mos7840_port_paranoia_check(port, __func__)) 1262 return -1; 1263 1264 mos7840_port = mos7840_get_port_private(port); 1265 if (mos7840_port == NULL) 1266 return -1; 1267 1268 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1269 for (i = 0; i < NUM_URBS; ++i) { 1270 if (!mos7840_port->busy[i]) 1271 room += URB_TRANSFER_BUFFER_SIZE; 1272 } 1273 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1274 1275 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1; 1276 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room); 1277 return room; 1278 1279 } 1280 1281 /***************************************************************************** 1282 * mos7840_write 1283 * this function is called by the tty driver when data should be written to 1284 * the port. 1285 * If successful, we return the number of bytes written, otherwise we 1286 * return a negative error number. 1287 *****************************************************************************/ 1288 1289 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port, 1290 const unsigned char *data, int count) 1291 { 1292 int status; 1293 int i; 1294 int bytes_sent = 0; 1295 int transfer_size; 1296 unsigned long flags; 1297 1298 struct moschip_port *mos7840_port; 1299 struct usb_serial *serial; 1300 struct urb *urb; 1301 /* __u16 Data; */ 1302 const unsigned char *current_position = data; 1303 unsigned char *data1; 1304 1305 if (mos7840_port_paranoia_check(port, __func__)) 1306 return -1; 1307 1308 serial = port->serial; 1309 if (mos7840_serial_paranoia_check(serial, __func__)) 1310 return -1; 1311 1312 mos7840_port = mos7840_get_port_private(port); 1313 if (mos7840_port == NULL) 1314 return -1; 1315 1316 /* try to find a free urb in the list */ 1317 urb = NULL; 1318 1319 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1320 for (i = 0; i < NUM_URBS; ++i) { 1321 if (!mos7840_port->busy[i]) { 1322 mos7840_port->busy[i] = 1; 1323 urb = mos7840_port->write_urb_pool[i]; 1324 dev_dbg(&port->dev, "URB:%d\n", i); 1325 break; 1326 } 1327 } 1328 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1329 1330 if (urb == NULL) { 1331 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1332 goto exit; 1333 } 1334 1335 if (urb->transfer_buffer == NULL) { 1336 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1337 GFP_ATOMIC); 1338 if (!urb->transfer_buffer) 1339 goto exit; 1340 } 1341 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1342 1343 memcpy(urb->transfer_buffer, current_position, transfer_size); 1344 1345 /* fill urb with data and submit */ 1346 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) { 1347 usb_fill_bulk_urb(urb, 1348 serial->dev, 1349 usb_sndbulkpipe(serial->dev, 1350 (port->bulk_out_endpointAddress) + 2), 1351 urb->transfer_buffer, 1352 transfer_size, 1353 mos7840_bulk_out_data_callback, mos7840_port); 1354 } else { 1355 usb_fill_bulk_urb(urb, 1356 serial->dev, 1357 usb_sndbulkpipe(serial->dev, 1358 port->bulk_out_endpointAddress), 1359 urb->transfer_buffer, 1360 transfer_size, 1361 mos7840_bulk_out_data_callback, mos7840_port); 1362 } 1363 1364 data1 = urb->transfer_buffer; 1365 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress); 1366 1367 if (mos7840_port->has_led) 1368 mos7840_led_activity(port); 1369 1370 /* send it down the pipe */ 1371 status = usb_submit_urb(urb, GFP_ATOMIC); 1372 1373 if (status) { 1374 mos7840_port->busy[i] = 0; 1375 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1376 "with status = %d\n", __func__, status); 1377 bytes_sent = status; 1378 goto exit; 1379 } 1380 bytes_sent = transfer_size; 1381 port->icount.tx += transfer_size; 1382 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx); 1383 exit: 1384 return bytes_sent; 1385 1386 } 1387 1388 /***************************************************************************** 1389 * mos7840_throttle 1390 * this function is called by the tty driver when it wants to stop the data 1391 * being read from the port. 1392 *****************************************************************************/ 1393 1394 static void mos7840_throttle(struct tty_struct *tty) 1395 { 1396 struct usb_serial_port *port = tty->driver_data; 1397 struct moschip_port *mos7840_port; 1398 int status; 1399 1400 if (mos7840_port_paranoia_check(port, __func__)) 1401 return; 1402 1403 mos7840_port = mos7840_get_port_private(port); 1404 1405 if (mos7840_port == NULL) 1406 return; 1407 1408 if (!mos7840_port->open) { 1409 dev_dbg(&port->dev, "%s", "port not opened\n"); 1410 return; 1411 } 1412 1413 /* if we are implementing XON/XOFF, send the stop character */ 1414 if (I_IXOFF(tty)) { 1415 unsigned char stop_char = STOP_CHAR(tty); 1416 status = mos7840_write(tty, port, &stop_char, 1); 1417 if (status <= 0) 1418 return; 1419 } 1420 /* if we are implementing RTS/CTS, toggle that line */ 1421 if (C_CRTSCTS(tty)) { 1422 mos7840_port->shadowMCR &= ~MCR_RTS; 1423 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1424 mos7840_port->shadowMCR); 1425 if (status < 0) 1426 return; 1427 } 1428 } 1429 1430 /***************************************************************************** 1431 * mos7840_unthrottle 1432 * this function is called by the tty driver when it wants to resume 1433 * the data being read from the port (called after mos7840_throttle is 1434 * called) 1435 *****************************************************************************/ 1436 static void mos7840_unthrottle(struct tty_struct *tty) 1437 { 1438 struct usb_serial_port *port = tty->driver_data; 1439 int status; 1440 struct moschip_port *mos7840_port = mos7840_get_port_private(port); 1441 1442 if (mos7840_port_paranoia_check(port, __func__)) 1443 return; 1444 1445 if (mos7840_port == NULL) 1446 return; 1447 1448 if (!mos7840_port->open) { 1449 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1450 return; 1451 } 1452 1453 /* if we are implementing XON/XOFF, send the start character */ 1454 if (I_IXOFF(tty)) { 1455 unsigned char start_char = START_CHAR(tty); 1456 status = mos7840_write(tty, port, &start_char, 1); 1457 if (status <= 0) 1458 return; 1459 } 1460 1461 /* if we are implementing RTS/CTS, toggle that line */ 1462 if (C_CRTSCTS(tty)) { 1463 mos7840_port->shadowMCR |= MCR_RTS; 1464 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1465 mos7840_port->shadowMCR); 1466 if (status < 0) 1467 return; 1468 } 1469 } 1470 1471 static int mos7840_tiocmget(struct tty_struct *tty) 1472 { 1473 struct usb_serial_port *port = tty->driver_data; 1474 struct moschip_port *mos7840_port; 1475 unsigned int result; 1476 __u16 msr; 1477 __u16 mcr; 1478 int status; 1479 mos7840_port = mos7840_get_port_private(port); 1480 1481 if (mos7840_port == NULL) 1482 return -ENODEV; 1483 1484 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr); 1485 if (status < 0) 1486 return -EIO; 1487 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr); 1488 if (status < 0) 1489 return -EIO; 1490 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) 1491 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0) 1492 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0) 1493 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) 1494 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) 1495 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) 1496 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); 1497 1498 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result); 1499 1500 return result; 1501 } 1502 1503 static int mos7840_tiocmset(struct tty_struct *tty, 1504 unsigned int set, unsigned int clear) 1505 { 1506 struct usb_serial_port *port = tty->driver_data; 1507 struct moschip_port *mos7840_port; 1508 unsigned int mcr; 1509 int status; 1510 1511 mos7840_port = mos7840_get_port_private(port); 1512 1513 if (mos7840_port == NULL) 1514 return -ENODEV; 1515 1516 /* FIXME: What locks the port registers ? */ 1517 mcr = mos7840_port->shadowMCR; 1518 if (clear & TIOCM_RTS) 1519 mcr &= ~MCR_RTS; 1520 if (clear & TIOCM_DTR) 1521 mcr &= ~MCR_DTR; 1522 if (clear & TIOCM_LOOP) 1523 mcr &= ~MCR_LOOPBACK; 1524 1525 if (set & TIOCM_RTS) 1526 mcr |= MCR_RTS; 1527 if (set & TIOCM_DTR) 1528 mcr |= MCR_DTR; 1529 if (set & TIOCM_LOOP) 1530 mcr |= MCR_LOOPBACK; 1531 1532 mos7840_port->shadowMCR = mcr; 1533 1534 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr); 1535 if (status < 0) { 1536 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n"); 1537 return status; 1538 } 1539 1540 return 0; 1541 } 1542 1543 /***************************************************************************** 1544 * mos7840_calc_baud_rate_divisor 1545 * this function calculates the proper baud rate divisor for the specified 1546 * baud rate. 1547 *****************************************************************************/ 1548 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port, 1549 int baudRate, int *divisor, 1550 __u16 *clk_sel_val) 1551 { 1552 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate); 1553 1554 if (baudRate <= 115200) { 1555 *divisor = 115200 / baudRate; 1556 *clk_sel_val = 0x0; 1557 } 1558 if ((baudRate > 115200) && (baudRate <= 230400)) { 1559 *divisor = 230400 / baudRate; 1560 *clk_sel_val = 0x10; 1561 } else if ((baudRate > 230400) && (baudRate <= 403200)) { 1562 *divisor = 403200 / baudRate; 1563 *clk_sel_val = 0x20; 1564 } else if ((baudRate > 403200) && (baudRate <= 460800)) { 1565 *divisor = 460800 / baudRate; 1566 *clk_sel_val = 0x30; 1567 } else if ((baudRate > 460800) && (baudRate <= 806400)) { 1568 *divisor = 806400 / baudRate; 1569 *clk_sel_val = 0x40; 1570 } else if ((baudRate > 806400) && (baudRate <= 921600)) { 1571 *divisor = 921600 / baudRate; 1572 *clk_sel_val = 0x50; 1573 } else if ((baudRate > 921600) && (baudRate <= 1572864)) { 1574 *divisor = 1572864 / baudRate; 1575 *clk_sel_val = 0x60; 1576 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) { 1577 *divisor = 3145728 / baudRate; 1578 *clk_sel_val = 0x70; 1579 } 1580 return 0; 1581 } 1582 1583 /***************************************************************************** 1584 * mos7840_send_cmd_write_baud_rate 1585 * this function sends the proper command to change the baud rate of the 1586 * specified port. 1587 *****************************************************************************/ 1588 1589 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port, 1590 int baudRate) 1591 { 1592 int divisor = 0; 1593 int status; 1594 __u16 Data; 1595 unsigned char number; 1596 __u16 clk_sel_val; 1597 struct usb_serial_port *port; 1598 1599 if (mos7840_port == NULL) 1600 return -1; 1601 1602 port = mos7840_port->port; 1603 if (mos7840_port_paranoia_check(port, __func__)) 1604 return -1; 1605 1606 if (mos7840_serial_paranoia_check(port->serial, __func__)) 1607 return -1; 1608 1609 number = mos7840_port->port->port_number; 1610 1611 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate); 1612 /* reset clk_uart_sel in spregOffset */ 1613 if (baudRate > 115200) { 1614 #ifdef HW_flow_control 1615 /* NOTE: need to see the pther register to modify */ 1616 /* setting h/w flow control bit to 1 */ 1617 Data = 0x2b; 1618 mos7840_port->shadowMCR = Data; 1619 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1620 Data); 1621 if (status < 0) { 1622 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1623 return -1; 1624 } 1625 #endif 1626 1627 } else { 1628 #ifdef HW_flow_control 1629 /* setting h/w flow control bit to 0 */ 1630 Data = 0xb; 1631 mos7840_port->shadowMCR = Data; 1632 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1633 Data); 1634 if (status < 0) { 1635 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1636 return -1; 1637 } 1638 #endif 1639 1640 } 1641 1642 if (1) { /* baudRate <= 115200) */ 1643 clk_sel_val = 0x0; 1644 Data = 0x0; 1645 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor, 1646 &clk_sel_val); 1647 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, 1648 &Data); 1649 if (status < 0) { 1650 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n"); 1651 return -1; 1652 } 1653 Data = (Data & 0x8f) | clk_sel_val; 1654 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, 1655 Data); 1656 if (status < 0) { 1657 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1658 return -1; 1659 } 1660 /* Calculate the Divisor */ 1661 1662 if (status) { 1663 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1664 return status; 1665 } 1666 /* Enable access to divisor latch */ 1667 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB; 1668 mos7840_port->shadowLCR = Data; 1669 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1670 1671 /* Write the divisor */ 1672 Data = (unsigned char)(divisor & 0xff); 1673 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data); 1674 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 1675 1676 Data = (unsigned char)((divisor & 0xff00) >> 8); 1677 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data); 1678 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 1679 1680 /* Disable access to divisor latch */ 1681 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB; 1682 mos7840_port->shadowLCR = Data; 1683 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1684 1685 } 1686 return status; 1687 } 1688 1689 /***************************************************************************** 1690 * mos7840_change_port_settings 1691 * This routine is called to set the UART on the device to match 1692 * the specified new settings. 1693 *****************************************************************************/ 1694 1695 static void mos7840_change_port_settings(struct tty_struct *tty, 1696 struct moschip_port *mos7840_port, struct ktermios *old_termios) 1697 { 1698 int baud; 1699 unsigned cflag; 1700 unsigned iflag; 1701 __u8 lData; 1702 __u8 lParity; 1703 __u8 lStop; 1704 int status; 1705 __u16 Data; 1706 struct usb_serial_port *port; 1707 struct usb_serial *serial; 1708 1709 if (mos7840_port == NULL) 1710 return; 1711 1712 port = mos7840_port->port; 1713 1714 if (mos7840_port_paranoia_check(port, __func__)) 1715 return; 1716 1717 if (mos7840_serial_paranoia_check(port->serial, __func__)) 1718 return; 1719 1720 serial = port->serial; 1721 1722 if (!mos7840_port->open) { 1723 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1724 return; 1725 } 1726 1727 lData = LCR_BITS_8; 1728 lStop = LCR_STOP_1; 1729 lParity = LCR_PAR_NONE; 1730 1731 cflag = tty->termios.c_cflag; 1732 iflag = tty->termios.c_iflag; 1733 1734 /* Change the number of bits */ 1735 switch (cflag & CSIZE) { 1736 case CS5: 1737 lData = LCR_BITS_5; 1738 break; 1739 1740 case CS6: 1741 lData = LCR_BITS_6; 1742 break; 1743 1744 case CS7: 1745 lData = LCR_BITS_7; 1746 break; 1747 1748 default: 1749 case CS8: 1750 lData = LCR_BITS_8; 1751 break; 1752 } 1753 1754 /* Change the Parity bit */ 1755 if (cflag & PARENB) { 1756 if (cflag & PARODD) { 1757 lParity = LCR_PAR_ODD; 1758 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1759 } else { 1760 lParity = LCR_PAR_EVEN; 1761 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1762 } 1763 1764 } else { 1765 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1766 } 1767 1768 if (cflag & CMSPAR) 1769 lParity = lParity | 0x20; 1770 1771 /* Change the Stop bit */ 1772 if (cflag & CSTOPB) { 1773 lStop = LCR_STOP_2; 1774 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1775 } else { 1776 lStop = LCR_STOP_1; 1777 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1778 } 1779 1780 /* Update the LCR with the correct value */ 1781 mos7840_port->shadowLCR &= 1782 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1783 mos7840_port->shadowLCR |= (lData | lParity | lStop); 1784 1785 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__, 1786 mos7840_port->shadowLCR); 1787 /* Disable Interrupts */ 1788 Data = 0x00; 1789 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1790 1791 Data = 0x00; 1792 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 1793 1794 Data = 0xcf; 1795 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 1796 1797 /* Send the updated LCR value to the mos7840 */ 1798 Data = mos7840_port->shadowLCR; 1799 1800 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1801 1802 Data = 0x00b; 1803 mos7840_port->shadowMCR = Data; 1804 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1805 Data = 0x00b; 1806 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1807 1808 /* set up the MCR register and send it to the mos7840 */ 1809 1810 mos7840_port->shadowMCR = MCR_MASTER_IE; 1811 if (cflag & CBAUD) 1812 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS); 1813 1814 if (cflag & CRTSCTS) 1815 mos7840_port->shadowMCR |= (MCR_XON_ANY); 1816 else 1817 mos7840_port->shadowMCR &= ~(MCR_XON_ANY); 1818 1819 Data = mos7840_port->shadowMCR; 1820 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1821 1822 /* Determine divisor based on baud rate */ 1823 baud = tty_get_baud_rate(tty); 1824 1825 if (!baud) { 1826 /* pick a default, any default... */ 1827 dev_dbg(&port->dev, "%s", "Picked default baud...\n"); 1828 baud = 9600; 1829 } 1830 1831 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1832 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud); 1833 1834 /* Enable Interrupts */ 1835 Data = 0x0c; 1836 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1837 1838 if (!mos7840_port->read_urb_busy) { 1839 mos7840_port->read_urb_busy = true; 1840 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1841 if (status) { 1842 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", 1843 status); 1844 mos7840_port->read_urb_busy = false; 1845 } 1846 } 1847 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__, 1848 mos7840_port->shadowLCR); 1849 } 1850 1851 /***************************************************************************** 1852 * mos7840_set_termios 1853 * this function is called by the tty driver when it wants to change 1854 * the termios structure 1855 *****************************************************************************/ 1856 1857 static void mos7840_set_termios(struct tty_struct *tty, 1858 struct usb_serial_port *port, 1859 struct ktermios *old_termios) 1860 { 1861 int status; 1862 struct usb_serial *serial; 1863 struct moschip_port *mos7840_port; 1864 1865 if (mos7840_port_paranoia_check(port, __func__)) 1866 return; 1867 1868 serial = port->serial; 1869 1870 if (mos7840_serial_paranoia_check(serial, __func__)) 1871 return; 1872 1873 mos7840_port = mos7840_get_port_private(port); 1874 1875 if (mos7840_port == NULL) 1876 return; 1877 1878 if (!mos7840_port->open) { 1879 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1880 return; 1881 } 1882 1883 /* change the port settings to the new ones specified */ 1884 1885 mos7840_change_port_settings(tty, mos7840_port, old_termios); 1886 1887 if (!mos7840_port->read_urb) { 1888 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n"); 1889 return; 1890 } 1891 1892 if (!mos7840_port->read_urb_busy) { 1893 mos7840_port->read_urb_busy = true; 1894 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1895 if (status) { 1896 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", 1897 status); 1898 mos7840_port->read_urb_busy = false; 1899 } 1900 } 1901 } 1902 1903 /***************************************************************************** 1904 * mos7840_get_lsr_info - get line status register info 1905 * 1906 * Purpose: Let user call ioctl() to get info when the UART physically 1907 * is emptied. On bus types like RS485, the transmitter must 1908 * release the bus after transmitting. This must be done when 1909 * the transmit shift register is empty, not be done when the 1910 * transmit holding register is empty. This functionality 1911 * allows an RS485 driver to be written in user space. 1912 *****************************************************************************/ 1913 1914 static int mos7840_get_lsr_info(struct tty_struct *tty, 1915 unsigned int __user *value) 1916 { 1917 int count; 1918 unsigned int result = 0; 1919 1920 count = mos7840_chars_in_buffer(tty); 1921 if (count == 0) 1922 result = TIOCSER_TEMT; 1923 1924 if (copy_to_user(value, &result, sizeof(int))) 1925 return -EFAULT; 1926 return 0; 1927 } 1928 1929 /***************************************************************************** 1930 * mos7840_get_serial_info 1931 * function to get information about serial port 1932 *****************************************************************************/ 1933 1934 static int mos7840_get_serial_info(struct tty_struct *tty, 1935 struct serial_struct *ss) 1936 { 1937 struct usb_serial_port *port = tty->driver_data; 1938 struct moschip_port *mos7840_port = mos7840_get_port_private(port); 1939 1940 ss->type = PORT_16550A; 1941 ss->line = mos7840_port->port->minor; 1942 ss->port = mos7840_port->port->port_number; 1943 ss->irq = 0; 1944 ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1945 ss->baud_base = 9600; 1946 ss->close_delay = 5 * HZ; 1947 ss->closing_wait = 30 * HZ; 1948 return 0; 1949 } 1950 1951 /***************************************************************************** 1952 * SerialIoctl 1953 * this function handles any ioctl calls to the driver 1954 *****************************************************************************/ 1955 1956 static int mos7840_ioctl(struct tty_struct *tty, 1957 unsigned int cmd, unsigned long arg) 1958 { 1959 struct usb_serial_port *port = tty->driver_data; 1960 void __user *argp = (void __user *)arg; 1961 struct moschip_port *mos7840_port; 1962 1963 if (mos7840_port_paranoia_check(port, __func__)) 1964 return -1; 1965 1966 mos7840_port = mos7840_get_port_private(port); 1967 1968 if (mos7840_port == NULL) 1969 return -1; 1970 1971 switch (cmd) { 1972 /* return number of bytes available */ 1973 1974 case TIOCSERGETLSR: 1975 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1976 return mos7840_get_lsr_info(tty, argp); 1977 1978 default: 1979 break; 1980 } 1981 return -ENOIOCTLCMD; 1982 } 1983 1984 static int mos7810_check(struct usb_serial *serial) 1985 { 1986 int i, pass_count = 0; 1987 u8 *buf; 1988 __u16 data = 0, mcr_data = 0; 1989 __u16 test_pattern = 0x55AA; 1990 int res; 1991 1992 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 1993 if (!buf) 1994 return 0; /* failed to identify 7810 */ 1995 1996 /* Store MCR setting */ 1997 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 1998 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER, 1999 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 2000 if (res == VENDOR_READ_LENGTH) 2001 mcr_data = *buf; 2002 2003 for (i = 0; i < 16; i++) { 2004 /* Send the 1-bit test pattern out to MCS7810 test pin */ 2005 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2006 MCS_WRREQ, MCS_WR_RTYPE, 2007 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)), 2008 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT); 2009 2010 /* Read the test pattern back */ 2011 res = usb_control_msg(serial->dev, 2012 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ, 2013 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf, 2014 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 2015 if (res == VENDOR_READ_LENGTH) 2016 data = *buf; 2017 2018 /* If this is a MCS7810 device, both test patterns must match */ 2019 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001) 2020 break; 2021 2022 pass_count++; 2023 } 2024 2025 /* Restore MCR setting */ 2026 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ, 2027 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL, 2028 0, MOS_WDR_TIMEOUT); 2029 2030 kfree(buf); 2031 2032 if (pass_count == 16) 2033 return 1; 2034 2035 return 0; 2036 } 2037 2038 static int mos7840_probe(struct usb_serial *serial, 2039 const struct usb_device_id *id) 2040 { 2041 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 2042 u8 *buf; 2043 int device_type; 2044 2045 if (product == MOSCHIP_DEVICE_ID_7810 || 2046 product == MOSCHIP_DEVICE_ID_7820) { 2047 device_type = product; 2048 goto out; 2049 } 2050 2051 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 2052 if (!buf) 2053 return -ENOMEM; 2054 2055 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2056 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf, 2057 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 2058 2059 /* For a MCS7840 device GPIO0 must be set to 1 */ 2060 if (buf[0] & 0x01) 2061 device_type = MOSCHIP_DEVICE_ID_7840; 2062 else if (mos7810_check(serial)) 2063 device_type = MOSCHIP_DEVICE_ID_7810; 2064 else 2065 device_type = MOSCHIP_DEVICE_ID_7820; 2066 2067 kfree(buf); 2068 out: 2069 usb_set_serial_data(serial, (void *)(unsigned long)device_type); 2070 2071 return 0; 2072 } 2073 2074 static int mos7840_calc_num_ports(struct usb_serial *serial, 2075 struct usb_serial_endpoints *epds) 2076 { 2077 int device_type = (unsigned long)usb_get_serial_data(serial); 2078 int num_ports; 2079 2080 num_ports = (device_type >> 4) & 0x000F; 2081 2082 /* 2083 * num_ports is currently never zero as device_type is one of 2084 * MOSCHIP_DEVICE_ID_78{1,2,4}0. 2085 */ 2086 if (num_ports == 0) 2087 return -ENODEV; 2088 2089 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) { 2090 dev_err(&serial->interface->dev, "missing endpoints\n"); 2091 return -ENODEV; 2092 } 2093 2094 return num_ports; 2095 } 2096 2097 static int mos7840_port_probe(struct usb_serial_port *port) 2098 { 2099 struct usb_serial *serial = port->serial; 2100 int device_type = (unsigned long)usb_get_serial_data(serial); 2101 struct moschip_port *mos7840_port; 2102 int status; 2103 int pnum; 2104 __u16 Data; 2105 2106 /* we set up the pointers to the endpoints in the mos7840_open * 2107 * function, as the structures aren't created yet. */ 2108 2109 pnum = port->port_number; 2110 2111 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum); 2112 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL); 2113 if (!mos7840_port) 2114 return -ENOMEM; 2115 2116 /* Initialize all port interrupt end point to port 0 int 2117 * endpoint. Our device has only one interrupt end point 2118 * common to all port */ 2119 2120 mos7840_port->port = port; 2121 mos7840_set_port_private(port, mos7840_port); 2122 spin_lock_init(&mos7840_port->pool_lock); 2123 2124 /* minor is not initialised until later by 2125 * usb-serial.c:get_free_serial() and cannot therefore be used 2126 * to index device instances */ 2127 mos7840_port->port_num = pnum + 1; 2128 dev_dbg(&port->dev, "port->minor = %d\n", port->minor); 2129 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num); 2130 2131 if (mos7840_port->port_num == 1) { 2132 mos7840_port->SpRegOffset = 0x0; 2133 mos7840_port->ControlRegOffset = 0x1; 2134 mos7840_port->DcrRegOffset = 0x4; 2135 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) { 2136 mos7840_port->SpRegOffset = 0x8; 2137 mos7840_port->ControlRegOffset = 0x9; 2138 mos7840_port->DcrRegOffset = 0x16; 2139 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) { 2140 mos7840_port->SpRegOffset = 0xa; 2141 mos7840_port->ControlRegOffset = 0xb; 2142 mos7840_port->DcrRegOffset = 0x19; 2143 } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) { 2144 mos7840_port->SpRegOffset = 0xa; 2145 mos7840_port->ControlRegOffset = 0xb; 2146 mos7840_port->DcrRegOffset = 0x19; 2147 } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) { 2148 mos7840_port->SpRegOffset = 0xc; 2149 mos7840_port->ControlRegOffset = 0xd; 2150 mos7840_port->DcrRegOffset = 0x1c; 2151 } 2152 mos7840_dump_serial_port(port, mos7840_port); 2153 mos7840_set_port_private(port, mos7840_port); 2154 2155 /* enable rx_disable bit in control register */ 2156 status = mos7840_get_reg_sync(port, 2157 mos7840_port->ControlRegOffset, &Data); 2158 if (status < 0) { 2159 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status); 2160 goto out; 2161 } else 2162 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status); 2163 Data |= 0x08; /* setting driver done bit */ 2164 Data |= 0x04; /* sp1_bit to have cts change reflect in 2165 modem status reg */ 2166 2167 /* Data |= 0x20; //rx_disable bit */ 2168 status = mos7840_set_reg_sync(port, 2169 mos7840_port->ControlRegOffset, Data); 2170 if (status < 0) { 2171 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status); 2172 goto out; 2173 } else 2174 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status); 2175 2176 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 2177 and 0x24 in DCR3 */ 2178 Data = 0x01; 2179 status = mos7840_set_reg_sync(port, 2180 (__u16) (mos7840_port->DcrRegOffset + 0), Data); 2181 if (status < 0) { 2182 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status); 2183 goto out; 2184 } else 2185 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status); 2186 2187 Data = 0x05; 2188 status = mos7840_set_reg_sync(port, 2189 (__u16) (mos7840_port->DcrRegOffset + 1), Data); 2190 if (status < 0) { 2191 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status); 2192 goto out; 2193 } else 2194 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status); 2195 2196 Data = 0x24; 2197 status = mos7840_set_reg_sync(port, 2198 (__u16) (mos7840_port->DcrRegOffset + 2), Data); 2199 if (status < 0) { 2200 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status); 2201 goto out; 2202 } else 2203 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status); 2204 2205 /* write values in clkstart0x0 and clkmulti 0x20 */ 2206 Data = 0x0; 2207 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data); 2208 if (status < 0) { 2209 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status); 2210 goto out; 2211 } else 2212 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status); 2213 2214 Data = 0x20; 2215 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data); 2216 if (status < 0) { 2217 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status); 2218 goto error; 2219 } else 2220 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status); 2221 2222 /* write value 0x0 to scratchpad register */ 2223 Data = 0x00; 2224 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data); 2225 if (status < 0) { 2226 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status); 2227 goto out; 2228 } else 2229 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status); 2230 2231 /* Zero Length flag register */ 2232 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) { 2233 Data = 0xff; 2234 status = mos7840_set_reg_sync(port, 2235 (__u16) (ZLP_REG1 + 2236 ((__u16)mos7840_port->port_num)), Data); 2237 dev_dbg(&port->dev, "ZLIP offset %x\n", 2238 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num))); 2239 if (status < 0) { 2240 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status); 2241 goto out; 2242 } else 2243 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status); 2244 } else { 2245 Data = 0xff; 2246 status = mos7840_set_reg_sync(port, 2247 (__u16) (ZLP_REG1 + 2248 ((__u16)mos7840_port->port_num) - 0x1), Data); 2249 dev_dbg(&port->dev, "ZLIP offset %x\n", 2250 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1)); 2251 if (status < 0) { 2252 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status); 2253 goto out; 2254 } else 2255 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status); 2256 2257 } 2258 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL); 2259 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL); 2260 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), 2261 GFP_KERNEL); 2262 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || 2263 !mos7840_port->dr) { 2264 status = -ENOMEM; 2265 goto error; 2266 } 2267 2268 mos7840_port->has_led = false; 2269 2270 /* Initialize LED timers */ 2271 if (device_type == MOSCHIP_DEVICE_ID_7810) { 2272 mos7840_port->has_led = true; 2273 2274 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL); 2275 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr), 2276 GFP_KERNEL); 2277 if (!mos7840_port->led_urb || !mos7840_port->led_dr) { 2278 status = -ENOMEM; 2279 goto error; 2280 } 2281 2282 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0); 2283 mos7840_port->led_timer1.expires = 2284 jiffies + msecs_to_jiffies(LED_ON_MS); 2285 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off, 2286 0); 2287 mos7840_port->led_timer2.expires = 2288 jiffies + msecs_to_jiffies(LED_OFF_MS); 2289 2290 /* Turn off LED */ 2291 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300); 2292 } 2293 out: 2294 if (pnum == serial->num_ports - 1) { 2295 /* Zero Length flag enable */ 2296 Data = 0x0f; 2297 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data); 2298 if (status < 0) { 2299 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status); 2300 goto error; 2301 } else 2302 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status); 2303 2304 /* setting configuration feature to one */ 2305 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2306 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 2307 MOS_WDR_TIMEOUT); 2308 } 2309 return 0; 2310 error: 2311 kfree(mos7840_port->led_dr); 2312 usb_free_urb(mos7840_port->led_urb); 2313 kfree(mos7840_port->dr); 2314 kfree(mos7840_port->ctrl_buf); 2315 usb_free_urb(mos7840_port->control_urb); 2316 kfree(mos7840_port); 2317 2318 return status; 2319 } 2320 2321 static int mos7840_port_remove(struct usb_serial_port *port) 2322 { 2323 struct moschip_port *mos7840_port; 2324 2325 mos7840_port = mos7840_get_port_private(port); 2326 2327 if (mos7840_port->has_led) { 2328 /* Turn off LED */ 2329 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300); 2330 2331 del_timer_sync(&mos7840_port->led_timer1); 2332 del_timer_sync(&mos7840_port->led_timer2); 2333 2334 usb_kill_urb(mos7840_port->led_urb); 2335 usb_free_urb(mos7840_port->led_urb); 2336 kfree(mos7840_port->led_dr); 2337 } 2338 usb_kill_urb(mos7840_port->control_urb); 2339 usb_free_urb(mos7840_port->control_urb); 2340 kfree(mos7840_port->ctrl_buf); 2341 kfree(mos7840_port->dr); 2342 kfree(mos7840_port); 2343 2344 return 0; 2345 } 2346 2347 static struct usb_serial_driver moschip7840_4port_device = { 2348 .driver = { 2349 .owner = THIS_MODULE, 2350 .name = "mos7840", 2351 }, 2352 .description = DRIVER_DESC, 2353 .id_table = id_table, 2354 .num_interrupt_in = 1, 2355 .open = mos7840_open, 2356 .close = mos7840_close, 2357 .write = mos7840_write, 2358 .write_room = mos7840_write_room, 2359 .chars_in_buffer = mos7840_chars_in_buffer, 2360 .throttle = mos7840_throttle, 2361 .unthrottle = mos7840_unthrottle, 2362 .calc_num_ports = mos7840_calc_num_ports, 2363 .probe = mos7840_probe, 2364 .ioctl = mos7840_ioctl, 2365 .get_serial = mos7840_get_serial_info, 2366 .set_termios = mos7840_set_termios, 2367 .break_ctl = mos7840_break, 2368 .tiocmget = mos7840_tiocmget, 2369 .tiocmset = mos7840_tiocmset, 2370 .tiocmiwait = usb_serial_generic_tiocmiwait, 2371 .get_icount = usb_serial_generic_get_icount, 2372 .port_probe = mos7840_port_probe, 2373 .port_remove = mos7840_port_remove, 2374 .read_bulk_callback = mos7840_bulk_in_callback, 2375 .read_int_callback = mos7840_interrupt_callback, 2376 }; 2377 2378 static struct usb_serial_driver * const serial_drivers[] = { 2379 &moschip7840_4port_device, NULL 2380 }; 2381 2382 module_usb_serial_driver(serial_drivers, id_table); 2383 2384 MODULE_DESCRIPTION(DRIVER_DESC); 2385 MODULE_LICENSE("GPL"); 2386