spcp8x5.c 27.1 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210
/*
 * spcp8x5 USB to serial adaptor driver
 *
 * Copyright (C) 2006 Linxb (xubin.lin@worldplus.com.cn)
 * Copyright (C) 2006 S1 Corp.
 *
 * Original driver for 2.6.10 pl2303 driver by
 *   Greg Kroah-Hartman (greg@kroah.com)
 * Changes for 2.6.20 by Harald Klein <hari@vt100.at>
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>


/* Version Information */
#define DRIVER_VERSION 	"v0.04"
#define DRIVER_DESC 	"SPCP8x5 USB to serial adaptor driver"

static int debug;

#define SPCP8x5_007_VID		0x04FC
#define SPCP8x5_007_PID		0x0201
#define SPCP8x5_008_VID		0x04fc
#define SPCP8x5_008_PID		0x0235
#define SPCP8x5_PHILIPS_VID	0x0471
#define SPCP8x5_PHILIPS_PID	0x081e
#define SPCP8x5_INTERMATIC_VID	0x04FC
#define SPCP8x5_INTERMATIC_PID	0x0204
#define SPCP8x5_835_VID		0x04fc
#define SPCP8x5_835_PID		0x0231

static struct usb_device_id id_table [] = {
	{ USB_DEVICE(SPCP8x5_PHILIPS_VID , SPCP8x5_PHILIPS_PID)},
	{ USB_DEVICE(SPCP8x5_INTERMATIC_VID, SPCP8x5_INTERMATIC_PID)},
	{ USB_DEVICE(SPCP8x5_835_VID, SPCP8x5_835_PID)},
	{ USB_DEVICE(SPCP8x5_008_VID, SPCP8x5_008_PID)},
	{ USB_DEVICE(SPCP8x5_007_VID, SPCP8x5_007_PID)},
	{ }					/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);

struct spcp8x5_usb_ctrl_arg {
	u8 	type;
	u8	cmd;
	u8	cmd_type;
	u16	value;
	u16	index;
	u16	length;
};

/* wait 30s before close */
#define SPCP8x5_CLOSING_WAIT	(30*HZ)

#define SPCP8x5_BUF_SIZE	1024


/* spcp8x5 spec register define */
#define MCR_CONTROL_LINE_RTS		0x02
#define MCR_CONTROL_LINE_DTR		0x01
#define MCR_DTR				0x01
#define MCR_RTS				0x02

#define MSR_STATUS_LINE_DCD		0x80
#define MSR_STATUS_LINE_RI		0x40
#define MSR_STATUS_LINE_DSR		0x20
#define MSR_STATUS_LINE_CTS		0x10

/* verdor command here , we should define myself */
#define SET_DEFAULT			0x40
#define SET_DEFAULT_TYPE		0x20

#define SET_UART_FORMAT			0x40
#define SET_UART_FORMAT_TYPE		0x21
#define SET_UART_FORMAT_SIZE_5		0x00
#define SET_UART_FORMAT_SIZE_6		0x01
#define SET_UART_FORMAT_SIZE_7		0x02
#define SET_UART_FORMAT_SIZE_8		0x03
#define SET_UART_FORMAT_STOP_1		0x00
#define SET_UART_FORMAT_STOP_2		0x04
#define SET_UART_FORMAT_PAR_NONE	0x00
#define SET_UART_FORMAT_PAR_ODD		0x10
#define SET_UART_FORMAT_PAR_EVEN	0x30
#define SET_UART_FORMAT_PAR_MASK	0xD0
#define SET_UART_FORMAT_PAR_SPACE	0x90

#define GET_UART_STATUS_TYPE		0xc0
#define GET_UART_STATUS			0x22
#define GET_UART_STATUS_MSR		0x06

#define SET_UART_STATUS			0x40
#define SET_UART_STATUS_TYPE		0x23
#define SET_UART_STATUS_MCR		0x0004
#define SET_UART_STATUS_MCR_DTR		0x01
#define SET_UART_STATUS_MCR_RTS		0x02
#define SET_UART_STATUS_MCR_LOOP	0x10

#define SET_WORKING_MODE		0x40
#define SET_WORKING_MODE_TYPE		0x24
#define SET_WORKING_MODE_U2C		0x00
#define SET_WORKING_MODE_RS485		0x01
#define SET_WORKING_MODE_PDMA		0x02
#define SET_WORKING_MODE_SPP		0x03

#define SET_FLOWCTL_CHAR		0x40
#define SET_FLOWCTL_CHAR_TYPE		0x25

#define GET_VERSION			0xc0
#define GET_VERSION_TYPE		0x26

#define SET_REGISTER			0x40
#define SET_REGISTER_TYPE		0x27

#define	GET_REGISTER			0xc0
#define GET_REGISTER_TYPE		0x28

#define SET_RAM				0x40
#define SET_RAM_TYPE			0x31

#define GET_RAM				0xc0
#define GET_RAM_TYPE			0x32

/* how come ??? */
#define UART_STATE			0x08
#define UART_STATE_TRANSIENT_MASK	0x74
#define UART_DCD			0x01
#define UART_DSR			0x02
#define UART_BREAK_ERROR		0x04
#define UART_RING			0x08
#define UART_FRAME_ERROR		0x10
#define UART_PARITY_ERROR		0x20
#define UART_OVERRUN_ERROR		0x40
#define UART_CTS			0x80

enum spcp8x5_type {
	SPCP825_007_TYPE,
	SPCP825_008_TYPE,
	SPCP825_PHILIP_TYPE,
	SPCP825_INTERMATIC_TYPE,
	SPCP835_TYPE,
};

/* 1st in 1st out buffer 4 driver */
struct ringbuf {
	unsigned int	buf_size;
	char		*buf_buf;
	char		*buf_get;
	char		*buf_put;
};

/* alloc the ring buf and alloc the buffer itself */
static inline struct ringbuf *alloc_ringbuf(unsigned int size)
{
	struct ringbuf *pb;

	if (size == 0)
		return NULL;

	pb = kmalloc(sizeof(*pb), GFP_KERNEL);
	if (pb == NULL)
		return NULL;

	pb->buf_buf = kmalloc(size, GFP_KERNEL);
	if (pb->buf_buf == NULL) {
		kfree(pb);
		return NULL;
	}

	pb->buf_size = size;
	pb->buf_get = pb->buf_put = pb->buf_buf;

	return pb;
}

/* free the ring buf and the buffer itself */
static inline void free_ringbuf(struct ringbuf *pb)
{
	if (pb != NULL) {
		kfree(pb->buf_buf);
		kfree(pb);
	}
}

/* clear pipo , juest repoint the pointer here */
static inline void clear_ringbuf(struct ringbuf *pb)
{
	if (pb != NULL)
		pb->buf_get = pb->buf_put;
}

/* get the number of data in the pipo */
static inline unsigned int ringbuf_avail_data(struct ringbuf *pb)
{
	if (pb == NULL)
		return 0;
Alan Cox's avatar
Alan Cox committed
211
	return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
212 213 214 215 216 217 218
}

/* get the number of space in the pipo */
static inline unsigned int ringbuf_avail_space(struct ringbuf *pb)
{
	if (pb == NULL)
		return 0;
Alan Cox's avatar
Alan Cox committed
219
	return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
}

/* put count data into pipo */
static unsigned int put_ringbuf(struct ringbuf *pb, const char *buf,
				unsigned int count)
{
	unsigned int len;

	if (pb == NULL)
		return 0;

	len  = ringbuf_avail_space(pb);
	if (count > len)
		count = len;

	if (count == 0)
		return 0;

	len = pb->buf_buf + pb->buf_size - pb->buf_put;
	if (count > len) {
		memcpy(pb->buf_put, buf, len);
		memcpy(pb->buf_buf, buf+len, count - len);
		pb->buf_put = pb->buf_buf + count - len;
	} else {
		memcpy(pb->buf_put, buf, count);
		if (count < len)
			pb->buf_put += count;
		else /* count == len */
			pb->buf_put = pb->buf_buf;
	}
	return count;
}

/* get count data from pipo */
static unsigned int get_ringbuf(struct ringbuf *pb, char *buf,
				unsigned int count)
{
	unsigned int len;

	if (pb == NULL || buf == NULL)
		return 0;

	len = ringbuf_avail_data(pb);
	if (count > len)
		count = len;

	if (count == 0)
		return 0;

	len = pb->buf_buf + pb->buf_size - pb->buf_get;
	if (count > len) {
		memcpy(buf, pb->buf_get, len);
		memcpy(buf+len, pb->buf_buf, count - len);
		pb->buf_get = pb->buf_buf + count - len;
	} else {
		memcpy(buf, pb->buf_get, count);
		if (count < len)
			pb->buf_get += count;
		else /* count == len */
			pb->buf_get = pb->buf_buf;
	}

	return count;
}

static struct usb_driver spcp8x5_driver = {
	.name =			"spcp8x5",
	.probe =		usb_serial_probe,
	.disconnect =		usb_serial_disconnect,
	.id_table =		id_table,
	.no_dynamic_id =	1,
};


struct spcp8x5_private {
	spinlock_t 	lock;
	struct ringbuf	*buf;
	int 		write_urb_in_use;
	enum spcp8x5_type	type;
	wait_queue_head_t	delta_msr_wait;
	u8 			line_control;
	u8 			line_status;
	u8 			termios_initialized;
};

/* desc : when device plug in,this function would be called.
 * thanks to usb_serial subsystem,then do almost every things for us. And what
 * we should do just alloc the buffer */
static int spcp8x5_startup(struct usb_serial *serial)
{
	struct spcp8x5_private *priv;
	int i;
	enum spcp8x5_type type = SPCP825_007_TYPE;
Al Viro's avatar
Al Viro committed
313
	u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
314

Al Viro's avatar
Al Viro committed
315
	if (product == 0x0201)
316
		type = SPCP825_007_TYPE;
Al Viro's avatar
Al Viro committed
317
	else if (product == 0x0231)
318
		type = SPCP835_TYPE;
Al Viro's avatar
Al Viro committed
319
	else if (product == 0x0235)
320
		type = SPCP825_008_TYPE;
Al Viro's avatar
Al Viro committed
321
	else if (product == 0x0204)
322
		type = SPCP825_INTERMATIC_TYPE;
Al Viro's avatar
Al Viro committed
323 324
	else if (product == 0x0471 &&
		 serial->dev->descriptor.idVendor == cpu_to_le16(0x081e))
325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
		type = SPCP825_PHILIP_TYPE;
	dev_dbg(&serial->dev->dev, "device type = %d\n", (int)type);

	for (i = 0; i < serial->num_ports; ++i) {
		priv = kzalloc(sizeof(struct spcp8x5_private), GFP_KERNEL);
		if (!priv)
			goto cleanup;

		spin_lock_init(&priv->lock);
		priv->buf = alloc_ringbuf(SPCP8x5_BUF_SIZE);
		if (priv->buf == NULL)
			goto cleanup2;

		init_waitqueue_head(&priv->delta_msr_wait);
		priv->type = type;
		usb_set_serial_port_data(serial->port[i] , priv);

	}

	return 0;

cleanup2:
	kfree(priv);
cleanup:
	for (--i; i >= 0; --i) {
		priv = usb_get_serial_port_data(serial->port[i]);
		free_ringbuf(priv->buf);
		kfree(priv);
		usb_set_serial_port_data(serial->port[i] , NULL);
	}
	return -ENOMEM;
}

/* call when the device plug out. free all the memory alloced by probe */
359
static void spcp8x5_release(struct usb_serial *serial)
360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447
{
	int i;
	struct spcp8x5_private *priv;

	for (i = 0; i < serial->num_ports; i++) {
		priv = usb_get_serial_port_data(serial->port[i]);
		if (priv) {
			free_ringbuf(priv->buf);
			kfree(priv);
		}
	}
}

/* set the modem control line of the device.
 * NOTE spcp825-007 not supported this */
static int spcp8x5_set_ctrlLine(struct usb_device *dev, u8 value,
				enum spcp8x5_type type)
{
	int retval;
	u8 mcr = 0 ;

	if (type == SPCP825_007_TYPE)
		return -EPERM;

	mcr = (unsigned short)value;
	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 SET_UART_STATUS_TYPE, SET_UART_STATUS,
				 mcr, 0x04, NULL, 0, 100);
	if (retval != 0)
		dev_dbg(&dev->dev, "usb_control_msg return %#x\n", retval);
	return retval;
}

/* get the modem status register of the device
 * NOTE spcp825-007 not supported this */
static int spcp8x5_get_msr(struct usb_device *dev, u8 *status,
			   enum spcp8x5_type type)
{
	u8 *status_buffer;
	int ret;

	/* I return Permited not support here but seem inval device
	 * is more fix */
	if (type == SPCP825_007_TYPE)
		return -EPERM;
	if (status == NULL)
		return -EINVAL;

	status_buffer = kmalloc(1, GFP_KERNEL);
	if (!status_buffer)
		return -ENOMEM;
	status_buffer[0] = status[0];

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			      GET_UART_STATUS, GET_UART_STATUS_TYPE,
			      0, GET_UART_STATUS_MSR, status_buffer, 1, 100);
	if (ret < 0)
		dev_dbg(&dev->dev, "Get MSR = 0x%p failed (error = %d)",
			status_buffer, ret);

	dev_dbg(&dev->dev, "0xc0:0x22:0:6  %d - 0x%p ", ret, status_buffer);
	status[0] = status_buffer[0];
	kfree(status_buffer);

	return ret;
}

/* select the work mode.
 * NOTE this function not supported by spcp825-007 */
static void spcp8x5_set_workMode(struct usb_device *dev, u16 value,
				 u16 index, enum spcp8x5_type type)
{
	int ret;

	/* I return Permited not support here but seem inval device
	 * is more fix */
	if (type == SPCP825_007_TYPE)
		return;

	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			      SET_WORKING_MODE_TYPE, SET_WORKING_MODE,
			      value, index, NULL, 0, 100);
	dev_dbg(&dev->dev, "value = %#x , index = %#x\n", value, index);
	if (ret < 0)
		dev_dbg(&dev->dev,
			"RTSCTS usb_control_msg(enable flowctrl) = %d\n", ret);
}

448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473
static int spcp8x5_carrier_raised(struct usb_serial_port *port)
{
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	if (priv->line_status & MSR_STATUS_LINE_DCD)
		return 1;
	return 0;
}

static void spcp8x5_dtr_rts(struct usb_serial_port *port, int on)
{
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	u8 control;

	spin_lock_irqsave(&priv->lock, flags);
	if (on)
		priv->line_control = MCR_CONTROL_LINE_DTR
						| MCR_CONTROL_LINE_RTS;
	else
		priv->line_control &= ~ (MCR_CONTROL_LINE_DTR
						| MCR_CONTROL_LINE_RTS);
	control = priv->line_control;
	spin_unlock_irqrestore(&priv->lock, flags);
	spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type);
}

474 475
/* close the serial port. We should wait for data sending to device 1st and
 * then kill all urb. */
476
static void spcp8x5_close(struct usb_serial_port *port)
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501
{
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int result;

	dbg("%s - port %d", __func__, port->number);

	spin_lock_irqsave(&priv->lock, flags);
	/* clear out any remaining data in the buffer */
	clear_ringbuf(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);

	/* kill urb */
	if (port->write_urb != NULL) {
		result = usb_unlink_urb(port->write_urb);
		if (result)
			dev_dbg(&port->dev,
				"usb_unlink_urb(write_urb) = %d\n", result);
	}
	result = usb_unlink_urb(port->read_urb);
	if (result)
		dev_dbg(&port->dev, "usb_unlink_urb(read_urb) = %d\n", result);
}

/* set the serial param for transfer. we should check if we really need to
Alan Cox's avatar
Alan Cox committed
502 503 504
 * transfer. if we set flow control we should do this too. */
static void spcp8x5_set_termios(struct tty_struct *tty,
		struct usb_serial_port *port, struct ktermios *old_termios)
505 506 507 508
{
	struct usb_serial *serial = port->serial;
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
Alan Cox's avatar
Alan Cox committed
509
	unsigned int cflag = tty->termios->c_cflag;
510 511 512 513 514 515 516 517 518 519
	unsigned int old_cflag = old_termios->c_cflag;
	unsigned short uartdata;
	unsigned char buf[2] = {0, 0};
	int baud;
	int i;
	u8 control;

	/* for the 1st time call this function */
	spin_lock_irqsave(&priv->lock, flags);
	if (!priv->termios_initialized) {
Alan Cox's avatar
Alan Cox committed
520 521 522 523
		*(tty->termios) = tty_std_termios;
		tty->termios->c_cflag = B115200 | CS8 | CREAD | HUPCL | CLOCAL;
		tty->termios->c_ispeed = 115200;
		tty->termios->c_ospeed = 115200;
524 525 526 527 528
		priv->termios_initialized = 1;
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	/* check that they really want us to change something */
Alan Cox's avatar
Alan Cox committed
529
	if (!tty_termios_hw_change(tty->termios, old_termios))
530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548
		return;

	/* set DTR/RTS active */
	spin_lock_irqsave(&priv->lock, flags);
	control = priv->line_control;
	if ((old_cflag & CBAUD) == B0) {
		priv->line_control |= MCR_DTR;
		if (!(old_cflag & CRTSCTS))
			priv->line_control |= MCR_RTS;
	}
	if (control != priv->line_control) {
		control = priv->line_control;
		spin_unlock_irqrestore(&priv->lock, flags);
		spcp8x5_set_ctrlLine(serial->dev, control , priv->type);
	} else {
		spin_unlock_irqrestore(&priv->lock, flags);
	}

	/* Set Baud Rate */
Alan Cox's avatar
Alan Cox committed
549
	baud = tty_get_baud_rate(tty);;
550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571
	switch (baud) {
	case 300:	buf[0] = 0x00;	break;
	case 600:	buf[0] = 0x01;	break;
	case 1200:	buf[0] = 0x02;	break;
	case 2400:	buf[0] = 0x03;	break;
	case 4800:	buf[0] = 0x04;	break;
	case 9600:	buf[0] = 0x05;	break;
	case 19200:	buf[0] = 0x07;	break;
	case 38400:	buf[0] = 0x09;	break;
	case 57600:	buf[0] = 0x0a;	break;
	case 115200:	buf[0] = 0x0b;	break;
	case 230400:	buf[0] = 0x0c;	break;
	case 460800:	buf[0] = 0x0d;	break;
	case 921600:	buf[0] = 0x0e;	break;
/*	case 1200000:	buf[0] = 0x0f;	break; */
/*	case 2400000:	buf[0] = 0x10;	break; */
	case 3000000:	buf[0] = 0x11;	break;
/*	case 6000000:	buf[0] = 0x12;	break; */
	case 0:
	case 1000000:
			buf[0] = 0x0b;	break;
	default:
572 573
		dev_err(&port->dev, "spcp825 driver does not support the "
			"baudrate requested, using default of 9600.\n");
574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611
	}

	/* Set Data Length : 00:5bit, 01:6bit, 10:7bit, 11:8bit */
	if (cflag & CSIZE) {
		switch (cflag & CSIZE) {
		case CS5:
			buf[1] |= SET_UART_FORMAT_SIZE_5;
			break;
		case CS6:
			buf[1] |= SET_UART_FORMAT_SIZE_6;
			break;
		case CS7:
			buf[1] |= SET_UART_FORMAT_SIZE_7;
			break;
		default:
		case CS8:
			buf[1] |= SET_UART_FORMAT_SIZE_8;
			break;
		}
	}

	/* Set Stop bit2 : 0:1bit 1:2bit */
	buf[1] |= (cflag & CSTOPB) ? SET_UART_FORMAT_STOP_2 :
				     SET_UART_FORMAT_STOP_1;

	/* Set Parity bit3-4 01:Odd 11:Even */
	if (cflag & PARENB) {
		buf[1] |= (cflag & PARODD) ?
		SET_UART_FORMAT_PAR_ODD : SET_UART_FORMAT_PAR_EVEN ;
	} else
		buf[1] |= SET_UART_FORMAT_PAR_NONE;

	uartdata = buf[0] | buf[1]<<8;

	i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			    SET_UART_FORMAT_TYPE, SET_UART_FORMAT,
			    uartdata, 0, NULL, 0, 100);
	if (i < 0)
612 613
		dev_err(&port->dev, "Set UART format %#x failed (error = %d)\n",
			uartdata, i);
614 615 616 617 618 619 620 621 622 623 624 625
	dbg("0x21:0x40:0:0  %d\n", i);

	if (cflag & CRTSCTS) {
		/* enable hardware flow control */
		spcp8x5_set_workMode(serial->dev, 0x000a,
				     SET_WORKING_MODE_U2C, priv->type);
	}
	return;
}

/* open the serial port. do some usb system call. set termios and get the line
 * status of the device. then submit the read urb */
626
static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port)
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649
{
	struct ktermios tmp_termios;
	struct usb_serial *serial = port->serial;
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	int ret;
	unsigned long flags;
	u8 status = 0x30;
	/* status 0x30 means DSR and CTS = 1 other CDC RI and delta = 0 */

	dbg("%s -  port %d", __func__, port->number);

	usb_clear_halt(serial->dev, port->write_urb->pipe);
	usb_clear_halt(serial->dev, port->read_urb->pipe);

	ret = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			      0x09, 0x00,
			      0x01, 0x00, NULL, 0x00, 100);
	if (ret)
		return ret;

	spcp8x5_set_ctrlLine(serial->dev, priv->line_control , priv->type);

	/* Setup termios */
Alan Cox's avatar
Alan Cox committed
650 651
	if (tty)
		spcp8x5_set_termios(tty, port, &tmp_termios);
652 653 654 655 656 657 658 659 660 661 662 663

	spcp8x5_get_msr(serial->dev, &status, priv->type);

	/* may be we should update uart status here but now we did not do */
	spin_lock_irqsave(&priv->lock, flags);
	priv->line_status = status & 0xf0 ;
	spin_unlock_irqrestore(&priv->lock, flags);

	dbg("%s - submitting read urb", __func__);
	port->read_urb->dev = serial->dev;
	ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
	if (ret) {
664
		spcp8x5_close(port);
665 666
		return -EPROTO;
	}
667
	port->port.drain_delay = 256;
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
	return 0;
}

/* bulk read call back function. check the status of the urb. if transfer
 * failed return. then update the status and the tty send data to tty subsys.
 * submit urb again.
 */
static void spcp8x5_read_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	unsigned char *data = urb->transfer_buffer;
	unsigned long flags;
	int i;
683 684
	int result = urb->status;
	u8 status;
685 686
	char tty_flag;

687 688
	dev_dbg(&port->dev, "start, result = %d, urb->actual_length = %d\n,",
		result, urb->actual_length);
689 690

	/* check the urb status */
691
	if (result) {
Alan Cox's avatar
Alan Cox committed
692
		if (!port->port.count)
693
			return;
694
		if (result == -EPROTO) {
695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
			/* spcp8x5 mysteriously fails with -EPROTO */
			/* reschedule the read */
			urb->dev = port->serial->dev;
			result = usb_submit_urb(urb , GFP_ATOMIC);
			if (result)
				dev_dbg(&port->dev,
					"failed submitting read urb %d\n",
					result);
			return;
		}
		dev_dbg(&port->dev, "unable to handle the error, exiting.\n");
		return;
	}

	/* get tty_flag from status */
	tty_flag = TTY_NORMAL;

	spin_lock_irqsave(&priv->lock, flags);
	status = priv->line_status;
	priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
	spin_unlock_irqrestore(&priv->lock, flags);
	/* wake up the wait for termios */
	wake_up_interruptible(&priv->delta_msr_wait);

	/* break takes precedence over parity, which takes precedence over
	 * framing errors */
	if (status & UART_BREAK_ERROR)
		tty_flag = TTY_BREAK;
	else if (status & UART_PARITY_ERROR)
		tty_flag = TTY_PARITY;
	else if (status & UART_FRAME_ERROR)
		tty_flag = TTY_FRAME;
	dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);

Alan Cox's avatar
Alan Cox committed
729
	tty = tty_port_tty_get(&port->port);
730 731 732 733 734 735 736 737 738
	if (tty && urb->actual_length) {
		tty_buffer_request_room(tty, urb->actual_length + 1);
		/* overrun is special, not associated with a char */
		if (status & UART_OVERRUN_ERROR)
			tty_insert_flip_char(tty, 0, TTY_OVERRUN);
		for (i = 0; i < urb->actual_length; ++i)
			tty_insert_flip_char(tty, data[i], tty_flag);
		tty_flip_buffer_push(tty);
	}
Alan Cox's avatar
Alan Cox committed
739
	tty_kref_put(tty);
740 741

	/* Schedule the next read _if_ we are still open */
Alan Cox's avatar
Alan Cox committed
742
	if (port->port.count) {
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
		urb->dev = port->serial->dev;
		result = usb_submit_urb(urb , GFP_ATOMIC);
		if (result)
			dev_dbg(&port->dev, "failed submitting read urb %d\n",
				result);
	}

	return;
}

/* get data from ring buffer and then write to usb bus */
static void spcp8x5_send(struct usb_serial_port *port)
{
	int count, result;
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);

	if (priv->write_urb_in_use) {
		dev_dbg(&port->dev, "write urb still used\n");
		spin_unlock_irqrestore(&priv->lock, flags);
		return;
	}

	/* send the 1st urb for writting */
	memset(port->write_urb->transfer_buffer , 0x00 , port->bulk_out_size);
	count = get_ringbuf(priv->buf, port->write_urb->transfer_buffer,
		port->bulk_out_size);

	if (count == 0) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return;
	}

	/* update the urb status */
	priv->write_urb_in_use = 1;

	spin_unlock_irqrestore(&priv->lock, flags);

	port->write_urb->transfer_buffer_length = count;
	port->write_urb->dev = port->serial->dev;

	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
	if (result) {
		dev_dbg(&port->dev, "failed submitting write urb, error %d\n",
			result);
		priv->write_urb_in_use = 0;
		/* TODO: reschedule spcp8x5_send */
	}


	schedule_work(&port->work);
}

/* this is the call back function for write urb. NOTE we should not sleep in
 * this routine. check the urb return code and then submit the write urb again
 * to hold the write loop */
static void spcp8x5_write_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	int result;
806
	int status = urb->status;
807

808
	switch (status) {
809 810 811 812 813 814 815 816
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dev_dbg(&port->dev, "urb shutting down with status: %d\n",
817
			status);
818 819 820 821 822 823
		priv->write_urb_in_use = 0;
		return;
	default:
		/* error in the urb, so we have to resubmit it */
		dbg("%s - Overflow in write", __func__);
		dbg("%s - nonzero write bulk status received: %d",
824
			__func__, status);
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
		port->write_urb->transfer_buffer_length = 1;
		port->write_urb->dev = port->serial->dev;
		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
		if (result)
			dev_dbg(&port->dev,
				"failed resubmitting write urb %d\n", result);
		else
			return;
	}

	priv->write_urb_in_use = 0;

	/* send any buffered data */
	spcp8x5_send(port);
}

/* write data to ring buffer. and then start the write transfer */
Alan Cox's avatar
Alan Cox committed
842
static int spcp8x5_write(struct tty_struct *tty, struct usb_serial_port *port,
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900
			 const unsigned char *buf, int count)
{
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	dev_dbg(&port->dev, "%d bytes\n", count);

	if (!count)
		return count;

	spin_lock_irqsave(&priv->lock, flags);
	count = put_ringbuf(priv->buf, buf, count);
	spin_unlock_irqrestore(&priv->lock, flags);

	spcp8x5_send(port);

	return count;
}

static int spcp8x5_wait_modem_info(struct usb_serial_port *port,
				   unsigned int arg)
{
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned int prevstatus;
	unsigned int status;
	unsigned int changed;

	spin_lock_irqsave(&priv->lock, flags);
	prevstatus = priv->line_status;
	spin_unlock_irqrestore(&priv->lock, flags);

	while (1) {
		/* wake up in bulk read */
		interruptible_sleep_on(&priv->delta_msr_wait);

		/* see if a signal did it */
		if (signal_pending(current))
			return -ERESTARTSYS;

		spin_lock_irqsave(&priv->lock, flags);
		status = priv->line_status;
		spin_unlock_irqrestore(&priv->lock, flags);

		changed = prevstatus^status;

		if (((arg & TIOCM_RNG) && (changed & MSR_STATUS_LINE_RI)) ||
		    ((arg & TIOCM_DSR) && (changed & MSR_STATUS_LINE_DSR)) ||
		    ((arg & TIOCM_CD)  && (changed & MSR_STATUS_LINE_DCD)) ||
		    ((arg & TIOCM_CTS) && (changed & MSR_STATUS_LINE_CTS)))
			return 0;

		prevstatus = status;
	}
	/* NOTREACHED */
	return 0;
}

Alan Cox's avatar
Alan Cox committed
901
static int spcp8x5_ioctl(struct tty_struct *tty, struct file *file,
902 903
			 unsigned int cmd, unsigned long arg)
{
Alan Cox's avatar
Alan Cox committed
904
	struct usb_serial_port *port = tty->driver_data;
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
	dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);

	switch (cmd) {
	case TIOCMIWAIT:
		dbg("%s (%d) TIOCMIWAIT", __func__,  port->number);
		return spcp8x5_wait_modem_info(port, arg);

	default:
		dbg("%s not supported = 0x%04x", __func__, cmd);
		break;
	}

	return -ENOIOCTLCMD;
}

Alan Cox's avatar
Alan Cox committed
920
static int spcp8x5_tiocmset(struct tty_struct *tty, struct file *file,
921 922
			    unsigned int set, unsigned int clear)
{
Alan Cox's avatar
Alan Cox committed
923
	struct usb_serial_port *port = tty->driver_data;
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	u8 control;

	spin_lock_irqsave(&priv->lock, flags);
	if (set & TIOCM_RTS)
		priv->line_control |= MCR_RTS;
	if (set & TIOCM_DTR)
		priv->line_control |= MCR_DTR;
	if (clear & TIOCM_RTS)
		priv->line_control &= ~MCR_RTS;
	if (clear & TIOCM_DTR)
		priv->line_control &= ~MCR_DTR;
	control = priv->line_control;
	spin_unlock_irqrestore(&priv->lock, flags);

	return spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type);
}

Alan Cox's avatar
Alan Cox committed
943
static int spcp8x5_tiocmget(struct tty_struct *tty, struct file *file)
944
{
Alan Cox's avatar
Alan Cox committed
945
	struct usb_serial_port *port = tty->driver_data;
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned int mcr;
	unsigned int status;
	unsigned int result;

	spin_lock_irqsave(&priv->lock, flags);
	mcr = priv->line_control;
	status = priv->line_status;
	spin_unlock_irqrestore(&priv->lock, flags);

	result = ((mcr & MCR_DTR)			? TIOCM_DTR : 0)
		  | ((mcr & MCR_RTS)			? TIOCM_RTS : 0)
		  | ((status & MSR_STATUS_LINE_CTS)	? TIOCM_CTS : 0)
		  | ((status & MSR_STATUS_LINE_DSR)	? TIOCM_DSR : 0)
		  | ((status & MSR_STATUS_LINE_RI)	? TIOCM_RI  : 0)
		  | ((status & MSR_STATUS_LINE_DCD)	? TIOCM_CD  : 0);

	return result;
}

/* get the avail space room in ring buffer */
Alan Cox's avatar
Alan Cox committed
968
static int spcp8x5_write_room(struct tty_struct *tty)
969
{
Alan Cox's avatar
Alan Cox committed
970
	struct usb_serial_port *port = tty->driver_data;
971 972 973 974 975 976 977 978 979 980 981 982
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	int room = 0;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	room = ringbuf_avail_space(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);

	return room;
}

/* get the number of avail data in write ring buffer */
Alan Cox's avatar
Alan Cox committed
983
static int spcp8x5_chars_in_buffer(struct tty_struct *tty)
984
{
Alan Cox's avatar
Alan Cox committed
985
	struct usb_serial_port *port = tty->driver_data;
986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006
	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
	int chars = 0;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	chars = ringbuf_avail_data(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);

	return chars;
}

/* All of the device info needed for the spcp8x5 SIO serial converter */
static struct usb_serial_driver spcp8x5_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"SPCP8x5",
	},
	.id_table		= id_table,
	.num_ports		= 1,
	.open 			= spcp8x5_open,
	.close 			= spcp8x5_close,
1007 1008
	.dtr_rts		= spcp8x5_dtr_rts,
	.carrier_raised		= spcp8x5_carrier_raised,
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	.write 			= spcp8x5_write,
	.set_termios 		= spcp8x5_set_termios,
	.ioctl 			= spcp8x5_ioctl,
	.tiocmget 		= spcp8x5_tiocmget,
	.tiocmset 		= spcp8x5_tiocmset,
	.write_room 		= spcp8x5_write_room,
	.read_bulk_callback 	= spcp8x5_read_bulk_callback,
	.write_bulk_callback	= spcp8x5_write_bulk_callback,
	.chars_in_buffer 	= spcp8x5_chars_in_buffer,
	.attach 		= spcp8x5_startup,
1019
	.release 		= spcp8x5_release,
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
};

static int __init spcp8x5_init(void)
{
	int retval;
	retval = usb_serial_register(&spcp8x5_device);
	if (retval)
		goto failed_usb_serial_register;
	retval = usb_register(&spcp8x5_driver);
	if (retval)
		goto failed_usb_register;
1031 1032
	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
	       DRIVER_DESC "\n");
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
	return 0;
failed_usb_register:
	usb_serial_deregister(&spcp8x5_device);
failed_usb_serial_register:
	return retval;
}

static void __exit spcp8x5_exit(void)
{
	usb_deregister(&spcp8x5_driver);
	usb_serial_deregister(&spcp8x5_device);
}

module_init(spcp8x5_init);
module_exit(spcp8x5_exit);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");