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_7843 0x7843 98 #define MOSCHIP_DEVICE_ID_7820 0x7820 99 #define MOSCHIP_DEVICE_ID_7810 0x7810 100 /* The native component can have its vendor/device id's overridden 101 * in vendor-specific implementations. Such devices can be handled 102 * by making a change here, in id_table. 103 */ 104 #define USB_VENDOR_ID_BANDB 0x0856 105 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22 106 #define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00 107 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24 108 #define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01 109 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29 110 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30 111 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31 112 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32 113 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42 114 #define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02 115 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44 116 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03 117 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24 118 119 /* This driver also supports 120 * ATEN UC2324 device using Moschip MCS7840 121 * ATEN UC2322 device using Moschip MCS7820 122 */ 123 #define USB_VENDOR_ID_ATENINTL 0x0557 124 #define ATENINTL_DEVICE_ID_UC2324 0x2011 125 #define ATENINTL_DEVICE_ID_UC2322 0x7820 126 127 /* Interrupt Routine Defines */ 128 129 #define SERIAL_IIR_RLS 0x06 130 #define SERIAL_IIR_MS 0x00 131 132 /* 133 * Emulation of the bit mask on the LINE STATUS REGISTER. 134 */ 135 #define SERIAL_LSR_DR 0x0001 136 #define SERIAL_LSR_OE 0x0002 137 #define SERIAL_LSR_PE 0x0004 138 #define SERIAL_LSR_FE 0x0008 139 #define SERIAL_LSR_BI 0x0010 140 141 #define MOS_MSR_DELTA_CTS 0x10 142 #define MOS_MSR_DELTA_DSR 0x20 143 #define MOS_MSR_DELTA_RI 0x40 144 #define MOS_MSR_DELTA_CD 0x80 145 146 /* Serial Port register Address */ 147 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01)) 148 #define FIFO_CONTROL_REGISTER ((__u16)(0x02)) 149 #define LINE_CONTROL_REGISTER ((__u16)(0x03)) 150 #define MODEM_CONTROL_REGISTER ((__u16)(0x04)) 151 #define LINE_STATUS_REGISTER ((__u16)(0x05)) 152 #define MODEM_STATUS_REGISTER ((__u16)(0x06)) 153 #define SCRATCH_PAD_REGISTER ((__u16)(0x07)) 154 #define DIVISOR_LATCH_LSB ((__u16)(0x00)) 155 #define DIVISOR_LATCH_MSB ((__u16)(0x01)) 156 157 #define CLK_MULTI_REGISTER ((__u16)(0x02)) 158 #define CLK_START_VALUE_REGISTER ((__u16)(0x03)) 159 #define GPIO_REGISTER ((__u16)(0x07)) 160 161 #define SERIAL_LCR_DLAB ((__u16)(0x0080)) 162 163 /* 164 * URB POOL related defines 165 */ 166 #define NUM_URBS 16 /* URB Count */ 167 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 168 169 /* LED on/off milliseconds*/ 170 #define LED_ON_MS 500 171 #define LED_OFF_MS 500 172 173 enum mos7840_flag { 174 MOS7840_FLAG_CTRL_BUSY, 175 MOS7840_FLAG_LED_BUSY, 176 }; 177 178 static const struct usb_device_id id_table[] = { 179 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)}, 180 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7843)}, 181 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)}, 182 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)}, 183 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)}, 184 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)}, 185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)}, 186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)}, 187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)}, 188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)}, 189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)}, 190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)}, 191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)}, 192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)}, 193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)}, 194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)}, 195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)}, 196 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)}, 197 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)}, 198 {} /* terminating entry */ 199 }; 200 MODULE_DEVICE_TABLE(usb, id_table); 201 202 /* This structure holds all of the local port information */ 203 204 struct moschip_port { 205 int port_num; /*Actual port number in the device(1,2,etc) */ 206 struct urb *read_urb; /* read URB for this port */ 207 __u8 shadowLCR; /* last LCR value received */ 208 __u8 shadowMCR; /* last MCR value received */ 209 char open; 210 char open_ports; 211 struct usb_serial_port *port; /* loop back to the owner of this object */ 212 213 /* Offsets */ 214 __u8 SpRegOffset; 215 __u8 ControlRegOffset; 216 __u8 DcrRegOffset; 217 /* for processing control URBS in interrupt context */ 218 struct urb *control_urb; 219 struct usb_ctrlrequest *dr; 220 char *ctrl_buf; 221 int MsrLsr; 222 223 spinlock_t pool_lock; 224 struct urb *write_urb_pool[NUM_URBS]; 225 char busy[NUM_URBS]; 226 bool read_urb_busy; 227 228 /* For device(s) with LED indicator */ 229 bool has_led; 230 struct timer_list led_timer1; /* Timer for LED on */ 231 struct timer_list led_timer2; /* Timer for LED off */ 232 struct urb *led_urb; 233 struct usb_ctrlrequest *led_dr; 234 235 unsigned long flags; 236 }; 237 238 /* 239 * mos7840_set_reg_sync 240 * To set the Control register by calling usb_fill_control_urb function 241 * by passing usb_sndctrlpipe function as parameter. 242 */ 243 244 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg, 245 __u16 val) 246 { 247 struct usb_device *dev = port->serial->dev; 248 val = val & 0x00ff; 249 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val); 250 251 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 252 MCS_WR_RTYPE, val, reg, NULL, 0, 253 MOS_WDR_TIMEOUT); 254 } 255 256 /* 257 * mos7840_get_reg_sync 258 * To set the Uart register by calling usb_fill_control_urb function by 259 * passing usb_rcvctrlpipe function as parameter. 260 */ 261 262 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg, 263 __u16 *val) 264 { 265 struct usb_device *dev = port->serial->dev; 266 int ret = 0; 267 u8 *buf; 268 269 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 270 if (!buf) 271 return -ENOMEM; 272 273 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 274 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH, 275 MOS_WDR_TIMEOUT); 276 if (ret < VENDOR_READ_LENGTH) { 277 if (ret >= 0) 278 ret = -EIO; 279 goto out; 280 } 281 282 *val = buf[0]; 283 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val); 284 out: 285 kfree(buf); 286 return ret; 287 } 288 289 /* 290 * mos7840_set_uart_reg 291 * To set the Uart register by calling usb_fill_control_urb function by 292 * passing usb_sndctrlpipe function as parameter. 293 */ 294 295 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg, 296 __u16 val) 297 { 298 299 struct usb_device *dev = port->serial->dev; 300 val = val & 0x00ff; 301 /* For the UART control registers, the application number need 302 to be Or'ed */ 303 if (port->serial->num_ports == 2 && port->port_number != 0) 304 val |= ((__u16)port->port_number + 2) << 8; 305 else 306 val |= ((__u16)port->port_number + 1) << 8; 307 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val); 308 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 309 MCS_WR_RTYPE, val, reg, NULL, 0, 310 MOS_WDR_TIMEOUT); 311 312 } 313 314 /* 315 * mos7840_get_uart_reg 316 * To set the Control register by calling usb_fill_control_urb function 317 * by passing usb_rcvctrlpipe function as parameter. 318 */ 319 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg, 320 __u16 *val) 321 { 322 struct usb_device *dev = port->serial->dev; 323 int ret = 0; 324 __u16 Wval; 325 u8 *buf; 326 327 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 328 if (!buf) 329 return -ENOMEM; 330 331 /* Wval is same as application number */ 332 if (port->serial->num_ports == 2 && port->port_number != 0) 333 Wval = ((__u16)port->port_number + 2) << 8; 334 else 335 Wval = ((__u16)port->port_number + 1) << 8; 336 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval); 337 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 338 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH, 339 MOS_WDR_TIMEOUT); 340 if (ret < VENDOR_READ_LENGTH) { 341 if (ret >= 0) 342 ret = -EIO; 343 goto out; 344 } 345 *val = buf[0]; 346 out: 347 kfree(buf); 348 return ret; 349 } 350 351 static void mos7840_dump_serial_port(struct usb_serial_port *port, 352 struct moschip_port *mos7840_port) 353 { 354 355 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset); 356 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset); 357 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset); 358 359 } 360 361 /************************************************************************/ 362 /************************************************************************/ 363 /* I N T E R F A C E F U N C T I O N S */ 364 /* I N T E R F A C E F U N C T I O N S */ 365 /************************************************************************/ 366 /************************************************************************/ 367 368 static inline void mos7840_set_port_private(struct usb_serial_port *port, 369 struct moschip_port *data) 370 { 371 usb_set_serial_port_data(port, (void *)data); 372 } 373 374 static inline struct moschip_port *mos7840_get_port_private(struct 375 usb_serial_port 376 *port) 377 { 378 return (struct moschip_port *)usb_get_serial_port_data(port); 379 } 380 381 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr) 382 { 383 struct moschip_port *mos7840_port; 384 struct async_icount *icount; 385 mos7840_port = port; 386 if (new_msr & 387 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI | 388 MOS_MSR_DELTA_CD)) { 389 icount = &mos7840_port->port->icount; 390 391 /* update input line counters */ 392 if (new_msr & MOS_MSR_DELTA_CTS) 393 icount->cts++; 394 if (new_msr & MOS_MSR_DELTA_DSR) 395 icount->dsr++; 396 if (new_msr & MOS_MSR_DELTA_CD) 397 icount->dcd++; 398 if (new_msr & MOS_MSR_DELTA_RI) 399 icount->rng++; 400 401 wake_up_interruptible(&port->port->port.delta_msr_wait); 402 } 403 } 404 405 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr) 406 { 407 struct async_icount *icount; 408 409 if (new_lsr & SERIAL_LSR_BI) { 410 /* 411 * Parity and Framing errors only count if they 412 * occur exclusive of a break being 413 * received. 414 */ 415 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI); 416 } 417 418 /* update input line counters */ 419 icount = &port->port->icount; 420 if (new_lsr & SERIAL_LSR_BI) 421 icount->brk++; 422 if (new_lsr & SERIAL_LSR_OE) 423 icount->overrun++; 424 if (new_lsr & SERIAL_LSR_PE) 425 icount->parity++; 426 if (new_lsr & SERIAL_LSR_FE) 427 icount->frame++; 428 } 429 430 /************************************************************************/ 431 /************************************************************************/ 432 /* U S B C A L L B A C K F U N C T I O N S */ 433 /* U S B C A L L B A C K F U N C T I O N S */ 434 /************************************************************************/ 435 /************************************************************************/ 436 437 static void mos7840_control_callback(struct urb *urb) 438 { 439 unsigned char *data; 440 struct moschip_port *mos7840_port; 441 struct device *dev = &urb->dev->dev; 442 __u8 regval = 0x0; 443 int status = urb->status; 444 445 mos7840_port = urb->context; 446 447 switch (status) { 448 case 0: 449 /* success */ 450 break; 451 case -ECONNRESET: 452 case -ENOENT: 453 case -ESHUTDOWN: 454 /* this urb is terminated, clean up */ 455 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); 456 goto out; 457 default: 458 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); 459 goto out; 460 } 461 462 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length); 463 if (urb->actual_length < 1) 464 goto out; 465 466 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__, 467 mos7840_port->MsrLsr, mos7840_port->port_num); 468 data = urb->transfer_buffer; 469 regval = (__u8) data[0]; 470 dev_dbg(dev, "%s data is %x\n", __func__, regval); 471 if (mos7840_port->MsrLsr == 0) 472 mos7840_handle_new_msr(mos7840_port, regval); 473 else if (mos7840_port->MsrLsr == 1) 474 mos7840_handle_new_lsr(mos7840_port, regval); 475 out: 476 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags); 477 } 478 479 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg, 480 __u16 *val) 481 { 482 struct usb_device *dev = mcs->port->serial->dev; 483 struct usb_ctrlrequest *dr = mcs->dr; 484 unsigned char *buffer = mcs->ctrl_buf; 485 int ret; 486 487 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags)) 488 return -EBUSY; 489 490 dr->bRequestType = MCS_RD_RTYPE; 491 dr->bRequest = MCS_RDREQ; 492 dr->wValue = cpu_to_le16(Wval); /* 0 */ 493 dr->wIndex = cpu_to_le16(reg); 494 dr->wLength = cpu_to_le16(2); 495 496 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0), 497 (unsigned char *)dr, buffer, 2, 498 mos7840_control_callback, mcs); 499 mcs->control_urb->transfer_buffer_length = 2; 500 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC); 501 if (ret) 502 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags); 503 504 return ret; 505 } 506 507 static void mos7840_set_led_callback(struct urb *urb) 508 { 509 switch (urb->status) { 510 case 0: 511 /* Success */ 512 break; 513 case -ECONNRESET: 514 case -ENOENT: 515 case -ESHUTDOWN: 516 /* This urb is terminated, clean up */ 517 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n", 518 __func__, urb->status); 519 break; 520 default: 521 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", 522 __func__, urb->status); 523 } 524 } 525 526 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval, 527 __u16 reg) 528 { 529 struct usb_device *dev = mcs->port->serial->dev; 530 struct usb_ctrlrequest *dr = mcs->led_dr; 531 532 dr->bRequestType = MCS_WR_RTYPE; 533 dr->bRequest = MCS_WRREQ; 534 dr->wValue = cpu_to_le16(wval); 535 dr->wIndex = cpu_to_le16(reg); 536 dr->wLength = cpu_to_le16(0); 537 538 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0), 539 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL); 540 541 usb_submit_urb(mcs->led_urb, GFP_ATOMIC); 542 } 543 544 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg, 545 __u16 val) 546 { 547 struct usb_device *dev = port->serial->dev; 548 549 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE, 550 val, reg, NULL, 0, MOS_WDR_TIMEOUT); 551 } 552 553 static void mos7840_led_off(struct timer_list *t) 554 { 555 struct moschip_port *mcs = from_timer(mcs, t, led_timer1); 556 557 /* Turn off LED */ 558 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER); 559 mod_timer(&mcs->led_timer2, 560 jiffies + msecs_to_jiffies(LED_OFF_MS)); 561 } 562 563 static void mos7840_led_flag_off(struct timer_list *t) 564 { 565 struct moschip_port *mcs = from_timer(mcs, t, led_timer2); 566 567 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags); 568 } 569 570 static void mos7840_led_activity(struct usb_serial_port *port) 571 { 572 struct moschip_port *mos7840_port = usb_get_serial_port_data(port); 573 574 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags)) 575 return; 576 577 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER); 578 mod_timer(&mos7840_port->led_timer1, 579 jiffies + msecs_to_jiffies(LED_ON_MS)); 580 } 581 582 /***************************************************************************** 583 * mos7840_interrupt_callback 584 * this is the callback function for when we have received data on the 585 * interrupt endpoint. 586 *****************************************************************************/ 587 588 static void mos7840_interrupt_callback(struct urb *urb) 589 { 590 int result; 591 int length; 592 struct moschip_port *mos7840_port; 593 struct usb_serial *serial; 594 __u16 Data; 595 unsigned char *data; 596 __u8 sp[5]; 597 int i, rv = 0; 598 __u16 wval, wreg = 0; 599 int status = urb->status; 600 601 switch (status) { 602 case 0: 603 /* success */ 604 break; 605 case -ECONNRESET: 606 case -ENOENT: 607 case -ESHUTDOWN: 608 /* this urb is terminated, clean up */ 609 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n", 610 __func__, status); 611 return; 612 default: 613 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", 614 __func__, status); 615 goto exit; 616 } 617 618 length = urb->actual_length; 619 data = urb->transfer_buffer; 620 621 serial = urb->context; 622 623 /* Moschip get 5 bytes 624 * Byte 1 IIR Port 1 (port.number is 0) 625 * Byte 2 IIR Port 2 (port.number is 1) 626 * Byte 3 IIR Port 3 (port.number is 2) 627 * Byte 4 IIR Port 4 (port.number is 3) 628 * Byte 5 FIFO status for both */ 629 630 if (length > 5) { 631 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n"); 632 return; 633 } 634 635 sp[0] = (__u8) data[0]; 636 sp[1] = (__u8) data[1]; 637 sp[2] = (__u8) data[2]; 638 sp[3] = (__u8) data[3]; 639 640 for (i = 0; i < serial->num_ports; i++) { 641 mos7840_port = mos7840_get_port_private(serial->port[i]); 642 wval = ((__u16)serial->port[i]->port_number + 1) << 8; 643 if (mos7840_port->open) { 644 if (sp[i] & 0x01) { 645 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i); 646 } else { 647 switch (sp[i] & 0x0f) { 648 case SERIAL_IIR_RLS: 649 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i); 650 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n"); 651 mos7840_port->MsrLsr = 1; 652 wreg = LINE_STATUS_REGISTER; 653 break; 654 case SERIAL_IIR_MS: 655 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i); 656 mos7840_port->MsrLsr = 0; 657 wreg = MODEM_STATUS_REGISTER; 658 break; 659 } 660 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data); 661 } 662 } 663 } 664 if (!(rv < 0)) 665 /* the completion handler for the control urb will resubmit */ 666 return; 667 exit: 668 result = usb_submit_urb(urb, GFP_ATOMIC); 669 if (result) { 670 dev_err(&urb->dev->dev, 671 "%s - Error %d submitting interrupt urb\n", 672 __func__, result); 673 } 674 } 675 676 static int mos7840_port_paranoia_check(struct usb_serial_port *port, 677 const char *function) 678 { 679 if (!port) { 680 pr_debug("%s - port == NULL\n", function); 681 return -1; 682 } 683 if (!port->serial) { 684 pr_debug("%s - port->serial == NULL\n", function); 685 return -1; 686 } 687 688 return 0; 689 } 690 691 /* Inline functions to check the sanity of a pointer that is passed to us */ 692 static int mos7840_serial_paranoia_check(struct usb_serial *serial, 693 const char *function) 694 { 695 if (!serial) { 696 pr_debug("%s - serial == NULL\n", function); 697 return -1; 698 } 699 if (!serial->type) { 700 pr_debug("%s - serial->type == NULL!\n", function); 701 return -1; 702 } 703 704 return 0; 705 } 706 707 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port, 708 const char *function) 709 { 710 /* if no port was specified, or it fails a paranoia check */ 711 if (!port || 712 mos7840_port_paranoia_check(port, function) || 713 mos7840_serial_paranoia_check(port->serial, function)) { 714 /* then say that we don't have a valid usb_serial thing, 715 * which will end up genrating -ENODEV return values */ 716 return NULL; 717 } 718 719 return port->serial; 720 } 721 722 /***************************************************************************** 723 * mos7840_bulk_in_callback 724 * this is the callback function for when we have received data on the 725 * bulk in endpoint. 726 *****************************************************************************/ 727 728 static void mos7840_bulk_in_callback(struct urb *urb) 729 { 730 int retval; 731 unsigned char *data; 732 struct usb_serial *serial; 733 struct usb_serial_port *port; 734 struct moschip_port *mos7840_port; 735 int status = urb->status; 736 737 mos7840_port = urb->context; 738 if (!mos7840_port) 739 return; 740 741 if (status) { 742 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); 743 mos7840_port->read_urb_busy = false; 744 return; 745 } 746 747 port = mos7840_port->port; 748 if (mos7840_port_paranoia_check(port, __func__)) { 749 mos7840_port->read_urb_busy = false; 750 return; 751 } 752 753 serial = mos7840_get_usb_serial(port, __func__); 754 if (!serial) { 755 mos7840_port->read_urb_busy = false; 756 return; 757 } 758 759 data = urb->transfer_buffer; 760 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 761 762 if (urb->actual_length) { 763 struct tty_port *tport = &mos7840_port->port->port; 764 tty_insert_flip_string(tport, data, urb->actual_length); 765 tty_flip_buffer_push(tport); 766 port->icount.rx += urb->actual_length; 767 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx); 768 } 769 770 if (!mos7840_port->read_urb) { 771 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n"); 772 mos7840_port->read_urb_busy = false; 773 return; 774 } 775 776 if (mos7840_port->has_led) 777 mos7840_led_activity(port); 778 779 mos7840_port->read_urb_busy = true; 780 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 781 782 if (retval) { 783 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); 784 mos7840_port->read_urb_busy = false; 785 } 786 } 787 788 /***************************************************************************** 789 * mos7840_bulk_out_data_callback 790 * this is the callback function for when we have finished sending 791 * serial data on the bulk out endpoint. 792 *****************************************************************************/ 793 794 static void mos7840_bulk_out_data_callback(struct urb *urb) 795 { 796 struct moschip_port *mos7840_port; 797 struct usb_serial_port *port; 798 int status = urb->status; 799 unsigned long flags; 800 int i; 801 802 mos7840_port = urb->context; 803 port = mos7840_port->port; 804 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 805 for (i = 0; i < NUM_URBS; i++) { 806 if (urb == mos7840_port->write_urb_pool[i]) { 807 mos7840_port->busy[i] = 0; 808 break; 809 } 810 } 811 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 812 813 if (status) { 814 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status); 815 return; 816 } 817 818 if (mos7840_port_paranoia_check(port, __func__)) 819 return; 820 821 if (mos7840_port->open) 822 tty_port_tty_wakeup(&port->port); 823 824 } 825 826 /************************************************************************/ 827 /* 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 */ 828 /************************************************************************/ 829 830 /***************************************************************************** 831 * mos7840_open 832 * this function is called by the tty driver when a port is opened 833 * If successful, we return 0 834 * Otherwise we return a negative error number. 835 *****************************************************************************/ 836 837 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port) 838 { 839 int response; 840 int j; 841 struct usb_serial *serial; 842 struct urb *urb; 843 __u16 Data; 844 int status; 845 struct moschip_port *mos7840_port; 846 struct moschip_port *port0; 847 848 if (mos7840_port_paranoia_check(port, __func__)) 849 return -ENODEV; 850 851 serial = port->serial; 852 853 if (mos7840_serial_paranoia_check(serial, __func__)) 854 return -ENODEV; 855 856 mos7840_port = mos7840_get_port_private(port); 857 port0 = mos7840_get_port_private(serial->port[0]); 858 859 if (mos7840_port == NULL || port0 == NULL) 860 return -ENODEV; 861 862 usb_clear_halt(serial->dev, port->write_urb->pipe); 863 usb_clear_halt(serial->dev, port->read_urb->pipe); 864 port0->open_ports++; 865 866 /* Initialising the write urb pool */ 867 for (j = 0; j < NUM_URBS; ++j) { 868 urb = usb_alloc_urb(0, GFP_KERNEL); 869 mos7840_port->write_urb_pool[j] = urb; 870 if (!urb) 871 continue; 872 873 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 874 GFP_KERNEL); 875 if (!urb->transfer_buffer) { 876 usb_free_urb(urb); 877 mos7840_port->write_urb_pool[j] = NULL; 878 continue; 879 } 880 } 881 882 /***************************************************************************** 883 * Initialize MCS7840 -- Write Init values to corresponding Registers 884 * 885 * Register Index 886 * 1 : IER 887 * 2 : FCR 888 * 3 : LCR 889 * 4 : MCR 890 * 891 * 0x08 : SP1/2 Control Reg 892 *****************************************************************************/ 893 894 /* NEED to check the following Block */ 895 896 Data = 0x0; 897 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 898 if (status < 0) { 899 dev_dbg(&port->dev, "Reading Spreg failed\n"); 900 goto err; 901 } 902 Data |= 0x80; 903 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 904 if (status < 0) { 905 dev_dbg(&port->dev, "writing Spreg failed\n"); 906 goto err; 907 } 908 909 Data &= ~0x80; 910 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 911 if (status < 0) { 912 dev_dbg(&port->dev, "writing Spreg failed\n"); 913 goto err; 914 } 915 /* End of block to be checked */ 916 917 Data = 0x0; 918 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 919 &Data); 920 if (status < 0) { 921 dev_dbg(&port->dev, "Reading Controlreg failed\n"); 922 goto err; 923 } 924 Data |= 0x08; /* Driver done bit */ 925 Data |= 0x20; /* rx_disable */ 926 status = mos7840_set_reg_sync(port, 927 mos7840_port->ControlRegOffset, Data); 928 if (status < 0) { 929 dev_dbg(&port->dev, "writing Controlreg failed\n"); 930 goto err; 931 } 932 /* do register settings here */ 933 /* Set all regs to the device default values. */ 934 /*********************************** 935 * First Disable all interrupts. 936 ***********************************/ 937 Data = 0x00; 938 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 939 if (status < 0) { 940 dev_dbg(&port->dev, "disabling interrupts failed\n"); 941 goto err; 942 } 943 /* Set FIFO_CONTROL_REGISTER to the default value */ 944 Data = 0x00; 945 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 946 if (status < 0) { 947 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n"); 948 goto err; 949 } 950 951 Data = 0xcf; 952 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 953 if (status < 0) { 954 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n"); 955 goto err; 956 } 957 958 Data = 0x03; 959 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 960 mos7840_port->shadowLCR = Data; 961 962 Data = 0x0b; 963 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 964 mos7840_port->shadowMCR = Data; 965 966 Data = 0x00; 967 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 968 mos7840_port->shadowLCR = Data; 969 970 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */ 971 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 972 973 Data = 0x0c; 974 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 975 976 Data = 0x0; 977 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 978 979 Data = 0x00; 980 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 981 982 Data = Data & ~SERIAL_LCR_DLAB; 983 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 984 mos7840_port->shadowLCR = Data; 985 986 /* clearing Bulkin and Bulkout Fifo */ 987 Data = 0x0; 988 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 989 990 Data = Data | 0x0c; 991 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 992 993 Data = Data & ~0x0c; 994 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 995 /* Finally enable all interrupts */ 996 Data = 0x0c; 997 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 998 999 /* clearing rx_disable */ 1000 Data = 0x0; 1001 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 1002 &Data); 1003 Data = Data & ~0x20; 1004 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 1005 Data); 1006 1007 /* rx_negate */ 1008 Data = 0x0; 1009 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 1010 &Data); 1011 Data = Data | 0x10; 1012 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 1013 Data); 1014 1015 /* Check to see if we've set up our endpoint info yet * 1016 * (can't set it up in mos7840_startup as the structures * 1017 * were not set up at that time.) */ 1018 if (port0->open_ports == 1) { 1019 /* FIXME: Buffer never NULL, so URB is not submitted. */ 1020 if (serial->port[0]->interrupt_in_buffer == NULL) { 1021 /* set up interrupt urb */ 1022 usb_fill_int_urb(serial->port[0]->interrupt_in_urb, 1023 serial->dev, 1024 usb_rcvintpipe(serial->dev, 1025 serial->port[0]->interrupt_in_endpointAddress), 1026 serial->port[0]->interrupt_in_buffer, 1027 serial->port[0]->interrupt_in_urb-> 1028 transfer_buffer_length, 1029 mos7840_interrupt_callback, 1030 serial, 1031 serial->port[0]->interrupt_in_urb->interval); 1032 1033 /* start interrupt read for mos7840 */ 1034 response = 1035 usb_submit_urb(serial->port[0]->interrupt_in_urb, 1036 GFP_KERNEL); 1037 if (response) { 1038 dev_err(&port->dev, "%s - Error %d submitting " 1039 "interrupt urb\n", __func__, response); 1040 } 1041 1042 } 1043 1044 } 1045 1046 /* see if we've set up our endpoint info yet * 1047 * (can't set it up in mos7840_startup as the * 1048 * structures were not set up at that time.) */ 1049 1050 dev_dbg(&port->dev, "port number is %d\n", port->port_number); 1051 dev_dbg(&port->dev, "minor number is %d\n", port->minor); 1052 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress); 1053 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress); 1054 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress); 1055 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num); 1056 mos7840_port->read_urb = port->read_urb; 1057 1058 /* set up our bulk in urb */ 1059 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) { 1060 usb_fill_bulk_urb(mos7840_port->read_urb, 1061 serial->dev, 1062 usb_rcvbulkpipe(serial->dev, 1063 (port->bulk_in_endpointAddress) + 2), 1064 port->bulk_in_buffer, 1065 mos7840_port->read_urb->transfer_buffer_length, 1066 mos7840_bulk_in_callback, mos7840_port); 1067 } else { 1068 usb_fill_bulk_urb(mos7840_port->read_urb, 1069 serial->dev, 1070 usb_rcvbulkpipe(serial->dev, 1071 port->bulk_in_endpointAddress), 1072 port->bulk_in_buffer, 1073 mos7840_port->read_urb->transfer_buffer_length, 1074 mos7840_bulk_in_callback, mos7840_port); 1075 } 1076 1077 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress); 1078 mos7840_port->read_urb_busy = true; 1079 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1080 if (response) { 1081 dev_err(&port->dev, "%s - Error %d submitting control urb\n", 1082 __func__, response); 1083 mos7840_port->read_urb_busy = false; 1084 } 1085 1086 /* initialize our port settings */ 1087 /* Must set to enable ints! */ 1088 mos7840_port->shadowMCR = MCR_MASTER_IE; 1089 /* send a open port command */ 1090 mos7840_port->open = 1; 1091 /* mos7840_change_port_settings(mos7840_port,old_termios); */ 1092 1093 return 0; 1094 err: 1095 for (j = 0; j < NUM_URBS; ++j) { 1096 urb = mos7840_port->write_urb_pool[j]; 1097 if (!urb) 1098 continue; 1099 kfree(urb->transfer_buffer); 1100 usb_free_urb(urb); 1101 } 1102 return status; 1103 } 1104 1105 /***************************************************************************** 1106 * mos7840_chars_in_buffer 1107 * this function is called by the tty driver when it wants to know how many 1108 * bytes of data we currently have outstanding in the port (data that has 1109 * been written, but hasn't made it out the port yet) 1110 * If successful, we return the number of bytes left to be written in the 1111 * system, 1112 * Otherwise we return zero. 1113 *****************************************************************************/ 1114 1115 static int mos7840_chars_in_buffer(struct tty_struct *tty) 1116 { 1117 struct usb_serial_port *port = tty->driver_data; 1118 int i; 1119 int chars = 0; 1120 unsigned long flags; 1121 struct moschip_port *mos7840_port; 1122 1123 if (mos7840_port_paranoia_check(port, __func__)) 1124 return 0; 1125 1126 mos7840_port = mos7840_get_port_private(port); 1127 if (mos7840_port == NULL) 1128 return 0; 1129 1130 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1131 for (i = 0; i < NUM_URBS; ++i) { 1132 if (mos7840_port->busy[i]) { 1133 struct urb *urb = mos7840_port->write_urb_pool[i]; 1134 chars += urb->transfer_buffer_length; 1135 } 1136 } 1137 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1138 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1139 return chars; 1140 1141 } 1142 1143 /***************************************************************************** 1144 * mos7840_close 1145 * this function is called by the tty driver when a port is closed 1146 *****************************************************************************/ 1147 1148 static void mos7840_close(struct usb_serial_port *port) 1149 { 1150 struct usb_serial *serial; 1151 struct moschip_port *mos7840_port; 1152 struct moschip_port *port0; 1153 int j; 1154 __u16 Data; 1155 1156 if (mos7840_port_paranoia_check(port, __func__)) 1157 return; 1158 1159 serial = mos7840_get_usb_serial(port, __func__); 1160 if (!serial) 1161 return; 1162 1163 mos7840_port = mos7840_get_port_private(port); 1164 port0 = mos7840_get_port_private(serial->port[0]); 1165 1166 if (mos7840_port == NULL || port0 == NULL) 1167 return; 1168 1169 for (j = 0; j < NUM_URBS; ++j) 1170 usb_kill_urb(mos7840_port->write_urb_pool[j]); 1171 1172 /* Freeing Write URBs */ 1173 for (j = 0; j < NUM_URBS; ++j) { 1174 if (mos7840_port->write_urb_pool[j]) { 1175 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer); 1176 usb_free_urb(mos7840_port->write_urb_pool[j]); 1177 } 1178 } 1179 1180 usb_kill_urb(mos7840_port->read_urb); 1181 mos7840_port->read_urb_busy = false; 1182 1183 port0->open_ports--; 1184 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports); 1185 if (port0->open_ports == 0) { 1186 if (serial->port[0]->interrupt_in_urb) { 1187 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n"); 1188 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1189 } 1190 } 1191 1192 Data = 0x0; 1193 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1194 1195 Data = 0x00; 1196 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1197 1198 mos7840_port->open = 0; 1199 } 1200 1201 /***************************************************************************** 1202 * mos7840_break 1203 * this function sends a break to the port 1204 *****************************************************************************/ 1205 static void mos7840_break(struct tty_struct *tty, int break_state) 1206 { 1207 struct usb_serial_port *port = tty->driver_data; 1208 unsigned char data; 1209 struct usb_serial *serial; 1210 struct moschip_port *mos7840_port; 1211 1212 if (mos7840_port_paranoia_check(port, __func__)) 1213 return; 1214 1215 serial = mos7840_get_usb_serial(port, __func__); 1216 if (!serial) 1217 return; 1218 1219 mos7840_port = mos7840_get_port_private(port); 1220 1221 if (mos7840_port == NULL) 1222 return; 1223 1224 if (break_state == -1) 1225 data = mos7840_port->shadowLCR | LCR_SET_BREAK; 1226 else 1227 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK; 1228 1229 /* FIXME: no locking on shadowLCR anywhere in driver */ 1230 mos7840_port->shadowLCR = data; 1231 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR); 1232 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, 1233 mos7840_port->shadowLCR); 1234 } 1235 1236 /***************************************************************************** 1237 * mos7840_write_room 1238 * this function is called by the tty driver when it wants to know how many 1239 * bytes of data we can accept for a specific port. 1240 * If successful, we return the amount of room that we have for this port 1241 * Otherwise we return a negative error number. 1242 *****************************************************************************/ 1243 1244 static int mos7840_write_room(struct tty_struct *tty) 1245 { 1246 struct usb_serial_port *port = tty->driver_data; 1247 int i; 1248 int room = 0; 1249 unsigned long flags; 1250 struct moschip_port *mos7840_port; 1251 1252 if (mos7840_port_paranoia_check(port, __func__)) 1253 return -1; 1254 1255 mos7840_port = mos7840_get_port_private(port); 1256 if (mos7840_port == NULL) 1257 return -1; 1258 1259 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1260 for (i = 0; i < NUM_URBS; ++i) { 1261 if (!mos7840_port->busy[i]) 1262 room += URB_TRANSFER_BUFFER_SIZE; 1263 } 1264 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1265 1266 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1; 1267 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room); 1268 return room; 1269 1270 } 1271 1272 /***************************************************************************** 1273 * mos7840_write 1274 * this function is called by the tty driver when data should be written to 1275 * the port. 1276 * If successful, we return the number of bytes written, otherwise we 1277 * return a negative error number. 1278 *****************************************************************************/ 1279 1280 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port, 1281 const unsigned char *data, int count) 1282 { 1283 int status; 1284 int i; 1285 int bytes_sent = 0; 1286 int transfer_size; 1287 unsigned long flags; 1288 1289 struct moschip_port *mos7840_port; 1290 struct usb_serial *serial; 1291 struct urb *urb; 1292 /* __u16 Data; */ 1293 const unsigned char *current_position = data; 1294 1295 if (mos7840_port_paranoia_check(port, __func__)) 1296 return -1; 1297 1298 serial = port->serial; 1299 if (mos7840_serial_paranoia_check(serial, __func__)) 1300 return -1; 1301 1302 mos7840_port = mos7840_get_port_private(port); 1303 if (mos7840_port == NULL) 1304 return -1; 1305 1306 /* try to find a free urb in the list */ 1307 urb = NULL; 1308 1309 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1310 for (i = 0; i < NUM_URBS; ++i) { 1311 if (!mos7840_port->busy[i]) { 1312 mos7840_port->busy[i] = 1; 1313 urb = mos7840_port->write_urb_pool[i]; 1314 dev_dbg(&port->dev, "URB:%d\n", i); 1315 break; 1316 } 1317 } 1318 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1319 1320 if (urb == NULL) { 1321 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__); 1322 goto exit; 1323 } 1324 1325 if (urb->transfer_buffer == NULL) { 1326 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 1327 GFP_ATOMIC); 1328 if (!urb->transfer_buffer) 1329 goto exit; 1330 } 1331 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1332 1333 memcpy(urb->transfer_buffer, current_position, transfer_size); 1334 1335 /* fill urb with data and submit */ 1336 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) { 1337 usb_fill_bulk_urb(urb, 1338 serial->dev, 1339 usb_sndbulkpipe(serial->dev, 1340 (port->bulk_out_endpointAddress) + 2), 1341 urb->transfer_buffer, 1342 transfer_size, 1343 mos7840_bulk_out_data_callback, mos7840_port); 1344 } else { 1345 usb_fill_bulk_urb(urb, 1346 serial->dev, 1347 usb_sndbulkpipe(serial->dev, 1348 port->bulk_out_endpointAddress), 1349 urb->transfer_buffer, 1350 transfer_size, 1351 mos7840_bulk_out_data_callback, mos7840_port); 1352 } 1353 1354 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress); 1355 1356 if (mos7840_port->has_led) 1357 mos7840_led_activity(port); 1358 1359 /* send it down the pipe */ 1360 status = usb_submit_urb(urb, GFP_ATOMIC); 1361 1362 if (status) { 1363 mos7840_port->busy[i] = 0; 1364 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed " 1365 "with status = %d\n", __func__, status); 1366 bytes_sent = status; 1367 goto exit; 1368 } 1369 bytes_sent = transfer_size; 1370 port->icount.tx += transfer_size; 1371 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx); 1372 exit: 1373 return bytes_sent; 1374 1375 } 1376 1377 /***************************************************************************** 1378 * mos7840_throttle 1379 * this function is called by the tty driver when it wants to stop the data 1380 * being read from the port. 1381 *****************************************************************************/ 1382 1383 static void mos7840_throttle(struct tty_struct *tty) 1384 { 1385 struct usb_serial_port *port = tty->driver_data; 1386 struct moschip_port *mos7840_port; 1387 int status; 1388 1389 if (mos7840_port_paranoia_check(port, __func__)) 1390 return; 1391 1392 mos7840_port = mos7840_get_port_private(port); 1393 1394 if (mos7840_port == NULL) 1395 return; 1396 1397 if (!mos7840_port->open) { 1398 dev_dbg(&port->dev, "%s", "port not opened\n"); 1399 return; 1400 } 1401 1402 /* if we are implementing XON/XOFF, send the stop character */ 1403 if (I_IXOFF(tty)) { 1404 unsigned char stop_char = STOP_CHAR(tty); 1405 status = mos7840_write(tty, port, &stop_char, 1); 1406 if (status <= 0) 1407 return; 1408 } 1409 /* if we are implementing RTS/CTS, toggle that line */ 1410 if (C_CRTSCTS(tty)) { 1411 mos7840_port->shadowMCR &= ~MCR_RTS; 1412 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1413 mos7840_port->shadowMCR); 1414 if (status < 0) 1415 return; 1416 } 1417 } 1418 1419 /***************************************************************************** 1420 * mos7840_unthrottle 1421 * this function is called by the tty driver when it wants to resume 1422 * the data being read from the port (called after mos7840_throttle is 1423 * called) 1424 *****************************************************************************/ 1425 static void mos7840_unthrottle(struct tty_struct *tty) 1426 { 1427 struct usb_serial_port *port = tty->driver_data; 1428 int status; 1429 struct moschip_port *mos7840_port = mos7840_get_port_private(port); 1430 1431 if (mos7840_port_paranoia_check(port, __func__)) 1432 return; 1433 1434 if (mos7840_port == NULL) 1435 return; 1436 1437 if (!mos7840_port->open) { 1438 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1439 return; 1440 } 1441 1442 /* if we are implementing XON/XOFF, send the start character */ 1443 if (I_IXOFF(tty)) { 1444 unsigned char start_char = START_CHAR(tty); 1445 status = mos7840_write(tty, port, &start_char, 1); 1446 if (status <= 0) 1447 return; 1448 } 1449 1450 /* if we are implementing RTS/CTS, toggle that line */ 1451 if (C_CRTSCTS(tty)) { 1452 mos7840_port->shadowMCR |= MCR_RTS; 1453 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1454 mos7840_port->shadowMCR); 1455 if (status < 0) 1456 return; 1457 } 1458 } 1459 1460 static int mos7840_tiocmget(struct tty_struct *tty) 1461 { 1462 struct usb_serial_port *port = tty->driver_data; 1463 struct moschip_port *mos7840_port; 1464 unsigned int result; 1465 __u16 msr; 1466 __u16 mcr; 1467 int status; 1468 mos7840_port = mos7840_get_port_private(port); 1469 1470 if (mos7840_port == NULL) 1471 return -ENODEV; 1472 1473 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr); 1474 if (status < 0) 1475 return -EIO; 1476 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr); 1477 if (status < 0) 1478 return -EIO; 1479 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) 1480 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0) 1481 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0) 1482 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) 1483 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) 1484 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) 1485 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); 1486 1487 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result); 1488 1489 return result; 1490 } 1491 1492 static int mos7840_tiocmset(struct tty_struct *tty, 1493 unsigned int set, unsigned int clear) 1494 { 1495 struct usb_serial_port *port = tty->driver_data; 1496 struct moschip_port *mos7840_port; 1497 unsigned int mcr; 1498 int status; 1499 1500 mos7840_port = mos7840_get_port_private(port); 1501 1502 if (mos7840_port == NULL) 1503 return -ENODEV; 1504 1505 /* FIXME: What locks the port registers ? */ 1506 mcr = mos7840_port->shadowMCR; 1507 if (clear & TIOCM_RTS) 1508 mcr &= ~MCR_RTS; 1509 if (clear & TIOCM_DTR) 1510 mcr &= ~MCR_DTR; 1511 if (clear & TIOCM_LOOP) 1512 mcr &= ~MCR_LOOPBACK; 1513 1514 if (set & TIOCM_RTS) 1515 mcr |= MCR_RTS; 1516 if (set & TIOCM_DTR) 1517 mcr |= MCR_DTR; 1518 if (set & TIOCM_LOOP) 1519 mcr |= MCR_LOOPBACK; 1520 1521 mos7840_port->shadowMCR = mcr; 1522 1523 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr); 1524 if (status < 0) { 1525 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n"); 1526 return status; 1527 } 1528 1529 return 0; 1530 } 1531 1532 /***************************************************************************** 1533 * mos7840_calc_baud_rate_divisor 1534 * this function calculates the proper baud rate divisor for the specified 1535 * baud rate. 1536 *****************************************************************************/ 1537 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port, 1538 int baudRate, int *divisor, 1539 __u16 *clk_sel_val) 1540 { 1541 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate); 1542 1543 if (baudRate <= 115200) { 1544 *divisor = 115200 / baudRate; 1545 *clk_sel_val = 0x0; 1546 } 1547 if ((baudRate > 115200) && (baudRate <= 230400)) { 1548 *divisor = 230400 / baudRate; 1549 *clk_sel_val = 0x10; 1550 } else if ((baudRate > 230400) && (baudRate <= 403200)) { 1551 *divisor = 403200 / baudRate; 1552 *clk_sel_val = 0x20; 1553 } else if ((baudRate > 403200) && (baudRate <= 460800)) { 1554 *divisor = 460800 / baudRate; 1555 *clk_sel_val = 0x30; 1556 } else if ((baudRate > 460800) && (baudRate <= 806400)) { 1557 *divisor = 806400 / baudRate; 1558 *clk_sel_val = 0x40; 1559 } else if ((baudRate > 806400) && (baudRate <= 921600)) { 1560 *divisor = 921600 / baudRate; 1561 *clk_sel_val = 0x50; 1562 } else if ((baudRate > 921600) && (baudRate <= 1572864)) { 1563 *divisor = 1572864 / baudRate; 1564 *clk_sel_val = 0x60; 1565 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) { 1566 *divisor = 3145728 / baudRate; 1567 *clk_sel_val = 0x70; 1568 } 1569 return 0; 1570 } 1571 1572 /***************************************************************************** 1573 * mos7840_send_cmd_write_baud_rate 1574 * this function sends the proper command to change the baud rate of the 1575 * specified port. 1576 *****************************************************************************/ 1577 1578 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port, 1579 int baudRate) 1580 { 1581 int divisor = 0; 1582 int status; 1583 __u16 Data; 1584 __u16 clk_sel_val; 1585 struct usb_serial_port *port; 1586 1587 if (mos7840_port == NULL) 1588 return -1; 1589 1590 port = mos7840_port->port; 1591 if (mos7840_port_paranoia_check(port, __func__)) 1592 return -1; 1593 1594 if (mos7840_serial_paranoia_check(port->serial, __func__)) 1595 return -1; 1596 1597 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate); 1598 /* reset clk_uart_sel in spregOffset */ 1599 if (baudRate > 115200) { 1600 #ifdef HW_flow_control 1601 /* NOTE: need to see the pther register to modify */ 1602 /* setting h/w flow control bit to 1 */ 1603 Data = 0x2b; 1604 mos7840_port->shadowMCR = Data; 1605 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1606 Data); 1607 if (status < 0) { 1608 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1609 return -1; 1610 } 1611 #endif 1612 1613 } else { 1614 #ifdef HW_flow_control 1615 /* setting h/w flow control bit to 0 */ 1616 Data = 0xb; 1617 mos7840_port->shadowMCR = Data; 1618 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1619 Data); 1620 if (status < 0) { 1621 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1622 return -1; 1623 } 1624 #endif 1625 1626 } 1627 1628 if (1) { /* baudRate <= 115200) */ 1629 clk_sel_val = 0x0; 1630 Data = 0x0; 1631 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor, 1632 &clk_sel_val); 1633 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, 1634 &Data); 1635 if (status < 0) { 1636 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n"); 1637 return -1; 1638 } 1639 Data = (Data & 0x8f) | clk_sel_val; 1640 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, 1641 Data); 1642 if (status < 0) { 1643 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n"); 1644 return -1; 1645 } 1646 /* Calculate the Divisor */ 1647 1648 if (status) { 1649 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1650 return status; 1651 } 1652 /* Enable access to divisor latch */ 1653 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB; 1654 mos7840_port->shadowLCR = Data; 1655 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1656 1657 /* Write the divisor */ 1658 Data = (unsigned char)(divisor & 0xff); 1659 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data); 1660 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 1661 1662 Data = (unsigned char)((divisor & 0xff00) >> 8); 1663 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data); 1664 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 1665 1666 /* Disable 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 } 1672 return status; 1673 } 1674 1675 /***************************************************************************** 1676 * mos7840_change_port_settings 1677 * This routine is called to set the UART on the device to match 1678 * the specified new settings. 1679 *****************************************************************************/ 1680 1681 static void mos7840_change_port_settings(struct tty_struct *tty, 1682 struct moschip_port *mos7840_port, struct ktermios *old_termios) 1683 { 1684 int baud; 1685 unsigned cflag; 1686 __u8 lData; 1687 __u8 lParity; 1688 __u8 lStop; 1689 int status; 1690 __u16 Data; 1691 struct usb_serial_port *port; 1692 1693 if (mos7840_port == NULL) 1694 return; 1695 1696 port = mos7840_port->port; 1697 1698 if (mos7840_port_paranoia_check(port, __func__)) 1699 return; 1700 1701 if (mos7840_serial_paranoia_check(port->serial, __func__)) 1702 return; 1703 1704 if (!mos7840_port->open) { 1705 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1706 return; 1707 } 1708 1709 lData = LCR_BITS_8; 1710 lStop = LCR_STOP_1; 1711 lParity = LCR_PAR_NONE; 1712 1713 cflag = tty->termios.c_cflag; 1714 1715 /* Change the number of bits */ 1716 switch (cflag & CSIZE) { 1717 case CS5: 1718 lData = LCR_BITS_5; 1719 break; 1720 1721 case CS6: 1722 lData = LCR_BITS_6; 1723 break; 1724 1725 case CS7: 1726 lData = LCR_BITS_7; 1727 break; 1728 1729 default: 1730 case CS8: 1731 lData = LCR_BITS_8; 1732 break; 1733 } 1734 1735 /* Change the Parity bit */ 1736 if (cflag & PARENB) { 1737 if (cflag & PARODD) { 1738 lParity = LCR_PAR_ODD; 1739 dev_dbg(&port->dev, "%s - parity = odd\n", __func__); 1740 } else { 1741 lParity = LCR_PAR_EVEN; 1742 dev_dbg(&port->dev, "%s - parity = even\n", __func__); 1743 } 1744 1745 } else { 1746 dev_dbg(&port->dev, "%s - parity = none\n", __func__); 1747 } 1748 1749 if (cflag & CMSPAR) 1750 lParity = lParity | 0x20; 1751 1752 /* Change the Stop bit */ 1753 if (cflag & CSTOPB) { 1754 lStop = LCR_STOP_2; 1755 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); 1756 } else { 1757 lStop = LCR_STOP_1; 1758 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); 1759 } 1760 1761 /* Update the LCR with the correct value */ 1762 mos7840_port->shadowLCR &= 1763 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 1764 mos7840_port->shadowLCR |= (lData | lParity | lStop); 1765 1766 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__, 1767 mos7840_port->shadowLCR); 1768 /* Disable Interrupts */ 1769 Data = 0x00; 1770 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1771 1772 Data = 0x00; 1773 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 1774 1775 Data = 0xcf; 1776 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 1777 1778 /* Send the updated LCR value to the mos7840 */ 1779 Data = mos7840_port->shadowLCR; 1780 1781 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1782 1783 Data = 0x00b; 1784 mos7840_port->shadowMCR = Data; 1785 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1786 Data = 0x00b; 1787 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1788 1789 /* set up the MCR register and send it to the mos7840 */ 1790 1791 mos7840_port->shadowMCR = MCR_MASTER_IE; 1792 if (cflag & CBAUD) 1793 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS); 1794 1795 if (cflag & CRTSCTS) 1796 mos7840_port->shadowMCR |= (MCR_XON_ANY); 1797 else 1798 mos7840_port->shadowMCR &= ~(MCR_XON_ANY); 1799 1800 Data = mos7840_port->shadowMCR; 1801 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1802 1803 /* Determine divisor based on baud rate */ 1804 baud = tty_get_baud_rate(tty); 1805 1806 if (!baud) { 1807 /* pick a default, any default... */ 1808 dev_dbg(&port->dev, "%s", "Picked default baud...\n"); 1809 baud = 9600; 1810 } 1811 1812 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); 1813 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud); 1814 1815 /* Enable Interrupts */ 1816 Data = 0x0c; 1817 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1818 1819 if (!mos7840_port->read_urb_busy) { 1820 mos7840_port->read_urb_busy = true; 1821 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1822 if (status) { 1823 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", 1824 status); 1825 mos7840_port->read_urb_busy = false; 1826 } 1827 } 1828 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__, 1829 mos7840_port->shadowLCR); 1830 } 1831 1832 /***************************************************************************** 1833 * mos7840_set_termios 1834 * this function is called by the tty driver when it wants to change 1835 * the termios structure 1836 *****************************************************************************/ 1837 1838 static void mos7840_set_termios(struct tty_struct *tty, 1839 struct usb_serial_port *port, 1840 struct ktermios *old_termios) 1841 { 1842 int status; 1843 struct usb_serial *serial; 1844 struct moschip_port *mos7840_port; 1845 1846 if (mos7840_port_paranoia_check(port, __func__)) 1847 return; 1848 1849 serial = port->serial; 1850 1851 if (mos7840_serial_paranoia_check(serial, __func__)) 1852 return; 1853 1854 mos7840_port = mos7840_get_port_private(port); 1855 1856 if (mos7840_port == NULL) 1857 return; 1858 1859 if (!mos7840_port->open) { 1860 dev_dbg(&port->dev, "%s - port not opened\n", __func__); 1861 return; 1862 } 1863 1864 /* change the port settings to the new ones specified */ 1865 1866 mos7840_change_port_settings(tty, mos7840_port, old_termios); 1867 1868 if (!mos7840_port->read_urb) { 1869 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n"); 1870 return; 1871 } 1872 1873 if (!mos7840_port->read_urb_busy) { 1874 mos7840_port->read_urb_busy = true; 1875 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1876 if (status) { 1877 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", 1878 status); 1879 mos7840_port->read_urb_busy = false; 1880 } 1881 } 1882 } 1883 1884 /***************************************************************************** 1885 * mos7840_get_lsr_info - get line status register info 1886 * 1887 * Purpose: Let user call ioctl() to get info when the UART physically 1888 * is emptied. On bus types like RS485, the transmitter must 1889 * release the bus after transmitting. This must be done when 1890 * the transmit shift register is empty, not be done when the 1891 * transmit holding register is empty. This functionality 1892 * allows an RS485 driver to be written in user space. 1893 *****************************************************************************/ 1894 1895 static int mos7840_get_lsr_info(struct tty_struct *tty, 1896 unsigned int __user *value) 1897 { 1898 int count; 1899 unsigned int result = 0; 1900 1901 count = mos7840_chars_in_buffer(tty); 1902 if (count == 0) 1903 result = TIOCSER_TEMT; 1904 1905 if (copy_to_user(value, &result, sizeof(int))) 1906 return -EFAULT; 1907 return 0; 1908 } 1909 1910 /***************************************************************************** 1911 * mos7840_get_serial_info 1912 * function to get information about serial port 1913 *****************************************************************************/ 1914 1915 static int mos7840_get_serial_info(struct tty_struct *tty, 1916 struct serial_struct *ss) 1917 { 1918 struct usb_serial_port *port = tty->driver_data; 1919 struct moschip_port *mos7840_port = mos7840_get_port_private(port); 1920 1921 ss->type = PORT_16550A; 1922 ss->line = mos7840_port->port->minor; 1923 ss->port = mos7840_port->port->port_number; 1924 ss->irq = 0; 1925 ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 1926 ss->baud_base = 9600; 1927 ss->close_delay = 5 * HZ; 1928 ss->closing_wait = 30 * HZ; 1929 return 0; 1930 } 1931 1932 /***************************************************************************** 1933 * SerialIoctl 1934 * this function handles any ioctl calls to the driver 1935 *****************************************************************************/ 1936 1937 static int mos7840_ioctl(struct tty_struct *tty, 1938 unsigned int cmd, unsigned long arg) 1939 { 1940 struct usb_serial_port *port = tty->driver_data; 1941 void __user *argp = (void __user *)arg; 1942 struct moschip_port *mos7840_port; 1943 1944 if (mos7840_port_paranoia_check(port, __func__)) 1945 return -1; 1946 1947 mos7840_port = mos7840_get_port_private(port); 1948 1949 if (mos7840_port == NULL) 1950 return -1; 1951 1952 switch (cmd) { 1953 /* return number of bytes available */ 1954 1955 case TIOCSERGETLSR: 1956 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); 1957 return mos7840_get_lsr_info(tty, argp); 1958 1959 default: 1960 break; 1961 } 1962 return -ENOIOCTLCMD; 1963 } 1964 1965 static int mos7810_check(struct usb_serial *serial) 1966 { 1967 int i, pass_count = 0; 1968 u8 *buf; 1969 __u16 data = 0, mcr_data = 0; 1970 __u16 test_pattern = 0x55AA; 1971 int res; 1972 1973 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 1974 if (!buf) 1975 return 0; /* failed to identify 7810 */ 1976 1977 /* Store MCR setting */ 1978 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 1979 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER, 1980 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 1981 if (res == VENDOR_READ_LENGTH) 1982 mcr_data = *buf; 1983 1984 for (i = 0; i < 16; i++) { 1985 /* Send the 1-bit test pattern out to MCS7810 test pin */ 1986 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1987 MCS_WRREQ, MCS_WR_RTYPE, 1988 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)), 1989 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT); 1990 1991 /* Read the test pattern back */ 1992 res = usb_control_msg(serial->dev, 1993 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ, 1994 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf, 1995 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 1996 if (res == VENDOR_READ_LENGTH) 1997 data = *buf; 1998 1999 /* If this is a MCS7810 device, both test patterns must match */ 2000 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001) 2001 break; 2002 2003 pass_count++; 2004 } 2005 2006 /* Restore MCR setting */ 2007 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ, 2008 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL, 2009 0, MOS_WDR_TIMEOUT); 2010 2011 kfree(buf); 2012 2013 if (pass_count == 16) 2014 return 1; 2015 2016 return 0; 2017 } 2018 2019 static int mos7840_probe(struct usb_serial *serial, 2020 const struct usb_device_id *id) 2021 { 2022 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); 2023 u8 *buf; 2024 int device_type; 2025 2026 if (product == MOSCHIP_DEVICE_ID_7810 || 2027 product == MOSCHIP_DEVICE_ID_7820 || 2028 product == MOSCHIP_DEVICE_ID_7843) { 2029 device_type = product; 2030 goto out; 2031 } 2032 2033 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL); 2034 if (!buf) 2035 return -ENOMEM; 2036 2037 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2038 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf, 2039 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT); 2040 2041 /* For a MCS7840 device GPIO0 must be set to 1 */ 2042 if (buf[0] & 0x01) 2043 device_type = MOSCHIP_DEVICE_ID_7840; 2044 else if (mos7810_check(serial)) 2045 device_type = MOSCHIP_DEVICE_ID_7810; 2046 else 2047 device_type = MOSCHIP_DEVICE_ID_7820; 2048 2049 kfree(buf); 2050 out: 2051 usb_set_serial_data(serial, (void *)(unsigned long)device_type); 2052 2053 return 0; 2054 } 2055 2056 static int mos7840_calc_num_ports(struct usb_serial *serial, 2057 struct usb_serial_endpoints *epds) 2058 { 2059 int device_type = (unsigned long)usb_get_serial_data(serial); 2060 int num_ports; 2061 2062 if (device_type == MOSCHIP_DEVICE_ID_7843) 2063 num_ports = 3; 2064 else 2065 num_ports = (device_type >> 4) & 0x000F; 2066 2067 /* 2068 * num_ports is currently never zero as device_type is one of 2069 * MOSCHIP_DEVICE_ID_78{1,2,4}0. 2070 */ 2071 if (num_ports == 0) 2072 return -ENODEV; 2073 2074 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) { 2075 dev_err(&serial->interface->dev, "missing endpoints\n"); 2076 return -ENODEV; 2077 } 2078 2079 return num_ports; 2080 } 2081 2082 static int mos7840_port_probe(struct usb_serial_port *port) 2083 { 2084 struct usb_serial *serial = port->serial; 2085 int device_type = (unsigned long)usb_get_serial_data(serial); 2086 struct moschip_port *mos7840_port; 2087 int status; 2088 int pnum; 2089 __u16 Data; 2090 2091 /* we set up the pointers to the endpoints in the mos7840_open * 2092 * function, as the structures aren't created yet. */ 2093 2094 pnum = port->port_number; 2095 2096 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum); 2097 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL); 2098 if (!mos7840_port) 2099 return -ENOMEM; 2100 2101 /* Initialize all port interrupt end point to port 0 int 2102 * endpoint. Our device has only one interrupt end point 2103 * common to all port */ 2104 2105 mos7840_port->port = port; 2106 mos7840_set_port_private(port, mos7840_port); 2107 spin_lock_init(&mos7840_port->pool_lock); 2108 2109 /* minor is not initialised until later by 2110 * usb-serial.c:get_free_serial() and cannot therefore be used 2111 * to index device instances */ 2112 mos7840_port->port_num = pnum + 1; 2113 dev_dbg(&port->dev, "port->minor = %d\n", port->minor); 2114 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num); 2115 2116 if (mos7840_port->port_num == 1) { 2117 mos7840_port->SpRegOffset = 0x0; 2118 mos7840_port->ControlRegOffset = 0x1; 2119 mos7840_port->DcrRegOffset = 0x4; 2120 } else { 2121 u8 phy_num = mos7840_port->port_num; 2122 2123 /* Port 2 in the 2-port case uses registers of port 3 */ 2124 if (serial->num_ports == 2) 2125 phy_num = 3; 2126 2127 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2); 2128 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2); 2129 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2); 2130 } 2131 mos7840_dump_serial_port(port, mos7840_port); 2132 mos7840_set_port_private(port, mos7840_port); 2133 2134 /* enable rx_disable bit in control register */ 2135 status = mos7840_get_reg_sync(port, 2136 mos7840_port->ControlRegOffset, &Data); 2137 if (status < 0) { 2138 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status); 2139 goto out; 2140 } else 2141 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status); 2142 Data |= 0x08; /* setting driver done bit */ 2143 Data |= 0x04; /* sp1_bit to have cts change reflect in 2144 modem status reg */ 2145 2146 /* Data |= 0x20; //rx_disable bit */ 2147 status = mos7840_set_reg_sync(port, 2148 mos7840_port->ControlRegOffset, Data); 2149 if (status < 0) { 2150 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status); 2151 goto out; 2152 } else 2153 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status); 2154 2155 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 2156 and 0x24 in DCR3 */ 2157 Data = 0x01; 2158 status = mos7840_set_reg_sync(port, 2159 (__u16) (mos7840_port->DcrRegOffset + 0), Data); 2160 if (status < 0) { 2161 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status); 2162 goto out; 2163 } else 2164 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status); 2165 2166 Data = 0x05; 2167 status = mos7840_set_reg_sync(port, 2168 (__u16) (mos7840_port->DcrRegOffset + 1), Data); 2169 if (status < 0) { 2170 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status); 2171 goto out; 2172 } else 2173 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status); 2174 2175 Data = 0x24; 2176 status = mos7840_set_reg_sync(port, 2177 (__u16) (mos7840_port->DcrRegOffset + 2), Data); 2178 if (status < 0) { 2179 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status); 2180 goto out; 2181 } else 2182 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status); 2183 2184 /* write values in clkstart0x0 and clkmulti 0x20 */ 2185 Data = 0x0; 2186 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data); 2187 if (status < 0) { 2188 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status); 2189 goto out; 2190 } else 2191 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status); 2192 2193 Data = 0x20; 2194 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data); 2195 if (status < 0) { 2196 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status); 2197 goto error; 2198 } else 2199 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status); 2200 2201 /* write value 0x0 to scratchpad register */ 2202 Data = 0x00; 2203 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data); 2204 if (status < 0) { 2205 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status); 2206 goto out; 2207 } else 2208 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status); 2209 2210 /* Zero Length flag register */ 2211 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) { 2212 Data = 0xff; 2213 status = mos7840_set_reg_sync(port, 2214 (__u16) (ZLP_REG1 + 2215 ((__u16)mos7840_port->port_num)), Data); 2216 dev_dbg(&port->dev, "ZLIP offset %x\n", 2217 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num))); 2218 if (status < 0) { 2219 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status); 2220 goto out; 2221 } else 2222 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status); 2223 } else { 2224 Data = 0xff; 2225 status = mos7840_set_reg_sync(port, 2226 (__u16) (ZLP_REG1 + 2227 ((__u16)mos7840_port->port_num) - 0x1), Data); 2228 dev_dbg(&port->dev, "ZLIP offset %x\n", 2229 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1)); 2230 if (status < 0) { 2231 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status); 2232 goto out; 2233 } else 2234 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status); 2235 2236 } 2237 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL); 2238 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL); 2239 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), 2240 GFP_KERNEL); 2241 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || 2242 !mos7840_port->dr) { 2243 status = -ENOMEM; 2244 goto error; 2245 } 2246 2247 mos7840_port->has_led = false; 2248 2249 /* Initialize LED timers */ 2250 if (device_type == MOSCHIP_DEVICE_ID_7810) { 2251 mos7840_port->has_led = true; 2252 2253 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL); 2254 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr), 2255 GFP_KERNEL); 2256 if (!mos7840_port->led_urb || !mos7840_port->led_dr) { 2257 status = -ENOMEM; 2258 goto error; 2259 } 2260 2261 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0); 2262 mos7840_port->led_timer1.expires = 2263 jiffies + msecs_to_jiffies(LED_ON_MS); 2264 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off, 2265 0); 2266 mos7840_port->led_timer2.expires = 2267 jiffies + msecs_to_jiffies(LED_OFF_MS); 2268 2269 /* Turn off LED */ 2270 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300); 2271 } 2272 out: 2273 if (pnum == serial->num_ports - 1) { 2274 /* Zero Length flag enable */ 2275 Data = 0x0f; 2276 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data); 2277 if (status < 0) { 2278 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status); 2279 goto error; 2280 } else 2281 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status); 2282 2283 /* setting configuration feature to one */ 2284 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2285 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 2286 MOS_WDR_TIMEOUT); 2287 } 2288 return 0; 2289 error: 2290 kfree(mos7840_port->led_dr); 2291 usb_free_urb(mos7840_port->led_urb); 2292 kfree(mos7840_port->dr); 2293 kfree(mos7840_port->ctrl_buf); 2294 usb_free_urb(mos7840_port->control_urb); 2295 kfree(mos7840_port); 2296 2297 return status; 2298 } 2299 2300 static int mos7840_port_remove(struct usb_serial_port *port) 2301 { 2302 struct moschip_port *mos7840_port; 2303 2304 mos7840_port = mos7840_get_port_private(port); 2305 2306 if (mos7840_port->has_led) { 2307 /* Turn off LED */ 2308 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300); 2309 2310 del_timer_sync(&mos7840_port->led_timer1); 2311 del_timer_sync(&mos7840_port->led_timer2); 2312 2313 usb_kill_urb(mos7840_port->led_urb); 2314 usb_free_urb(mos7840_port->led_urb); 2315 kfree(mos7840_port->led_dr); 2316 } 2317 usb_kill_urb(mos7840_port->control_urb); 2318 usb_free_urb(mos7840_port->control_urb); 2319 kfree(mos7840_port->ctrl_buf); 2320 kfree(mos7840_port->dr); 2321 kfree(mos7840_port); 2322 2323 return 0; 2324 } 2325 2326 static struct usb_serial_driver moschip7840_4port_device = { 2327 .driver = { 2328 .owner = THIS_MODULE, 2329 .name = "mos7840", 2330 }, 2331 .description = DRIVER_DESC, 2332 .id_table = id_table, 2333 .num_interrupt_in = 1, 2334 .open = mos7840_open, 2335 .close = mos7840_close, 2336 .write = mos7840_write, 2337 .write_room = mos7840_write_room, 2338 .chars_in_buffer = mos7840_chars_in_buffer, 2339 .throttle = mos7840_throttle, 2340 .unthrottle = mos7840_unthrottle, 2341 .calc_num_ports = mos7840_calc_num_ports, 2342 .probe = mos7840_probe, 2343 .ioctl = mos7840_ioctl, 2344 .get_serial = mos7840_get_serial_info, 2345 .set_termios = mos7840_set_termios, 2346 .break_ctl = mos7840_break, 2347 .tiocmget = mos7840_tiocmget, 2348 .tiocmset = mos7840_tiocmset, 2349 .tiocmiwait = usb_serial_generic_tiocmiwait, 2350 .get_icount = usb_serial_generic_get_icount, 2351 .port_probe = mos7840_port_probe, 2352 .port_remove = mos7840_port_remove, 2353 .read_bulk_callback = mos7840_bulk_in_callback, 2354 .read_int_callback = mos7840_interrupt_callback, 2355 }; 2356 2357 static struct usb_serial_driver * const serial_drivers[] = { 2358 &moschip7840_4port_device, NULL 2359 }; 2360 2361 module_usb_serial_driver(serial_drivers, id_table); 2362 2363 MODULE_DESCRIPTION(DRIVER_DESC); 2364 MODULE_LICENSE("GPL"); 2365