1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Prolific PL2303 USB to serial adaptor driver
   4 *
   5 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
   6 * Copyright (C) 2003 IBM Corp.
   7 *
   8 * Original driver for 2.2.x by anonymous
   9 *
  10 * See Documentation/usb/usb-serial.rst for more information on using this
  11 * driver
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/errno.h>
  16#include <linux/slab.h>
  17#include <linux/tty.h>
  18#include <linux/tty_driver.h>
  19#include <linux/tty_flip.h>
  20#include <linux/serial.h>
  21#include <linux/module.h>
  22#include <linux/moduleparam.h>
  23#include <linux/spinlock.h>
  24#include <linux/uaccess.h>
  25#include <linux/usb.h>
  26#include <linux/usb/serial.h>
  27#include <asm/unaligned.h>
  28#include "pl2303.h"
  29
  30
  31#define PL2303_QUIRK_UART_STATE_IDX0		BIT(0)
  32#define PL2303_QUIRK_LEGACY			BIT(1)
  33#define PL2303_QUIRK_ENDPOINT_HACK		BIT(2)
  34
  35static const struct usb_device_id id_table[] = {
  36	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
  37		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  38	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  39	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
  40	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  41	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) },
  42	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  43	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
  44	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
  45	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
  46	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
  47	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
  48	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
  49	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
  50	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
  51	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
  52	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
  53	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
  54	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
  55	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
  56	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  57	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
  58	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
  59		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  60	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
  61		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  62	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B),
  63		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  64	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
  65	{ USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  66	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  67	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  68	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  69	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  70	{ USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  71	{ USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  72	{ USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  73	{ USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  74	{ USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  75	{ USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  76	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  77	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
  78		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  79	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
  80		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  81	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
  82		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  83	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
  84		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  85	{ USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  86	{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  87	{ USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  88	{ USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  89	{ USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  90	{ USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  91	{ USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  92	{ USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  93	{ USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  94	{ USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
  95		.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  96	{ USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  97	{ USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  98	{ USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
  99	{ USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
 100	{ USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
 101	{ USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) },
 102	{ USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) },
 103	{ USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) },
 104	{ USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
 105	{ USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
 106	{ USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
 107	{ USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
 108	{ USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
 109	{ USB_DEVICE(HP_VENDOR_ID, HP_LM930_PRODUCT_ID) },
 110	{ USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
 111	{ USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
 112	{ USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
 113	{ USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
 114	{ USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
 115	{ USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
 116	{ USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
 117	{ USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) },
 118	{ USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 119	{ USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
 120	{ USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) },
 121	{ }					/* Terminating entry */
 122};
 123
 124MODULE_DEVICE_TABLE(usb, id_table);
 125
 126#define SET_LINE_REQUEST_TYPE		0x21
 127#define SET_LINE_REQUEST		0x20
 128
 129#define SET_CONTROL_REQUEST_TYPE	0x21
 130#define SET_CONTROL_REQUEST		0x22
 131#define CONTROL_DTR			0x01
 132#define CONTROL_RTS			0x02
 133
 134#define BREAK_REQUEST_TYPE		0x21
 135#define BREAK_REQUEST			0x23
 136#define BREAK_ON			0xffff
 137#define BREAK_OFF			0x0000
 138
 139#define GET_LINE_REQUEST_TYPE		0xa1
 140#define GET_LINE_REQUEST		0x21
 141
 142#define VENDOR_WRITE_REQUEST_TYPE	0x40
 143#define VENDOR_WRITE_REQUEST		0x01
 144#define VENDOR_WRITE_NREQUEST		0x80
 145
 146#define VENDOR_READ_REQUEST_TYPE	0xc0
 147#define VENDOR_READ_REQUEST		0x01
 148#define VENDOR_READ_NREQUEST		0x81
 149
 150#define UART_STATE_INDEX		8
 151#define UART_STATE_MSR_MASK		0x8b
 152#define UART_STATE_TRANSIENT_MASK	0x74
 153#define UART_DCD			0x01
 154#define UART_DSR			0x02
 155#define UART_BREAK_ERROR		0x04
 156#define UART_RING			0x08
 157#define UART_FRAME_ERROR		0x10
 158#define UART_PARITY_ERROR		0x20
 159#define UART_OVERRUN_ERROR		0x40
 160#define UART_CTS			0x80
 161
 162#define PL2303_FLOWCTRL_MASK		0xf0
 163
 164#define PL2303_READ_TYPE_HX_STATUS	0x8080
 165
 166#define PL2303_HXN_RESET_REG		0x07
 167#define PL2303_HXN_RESET_UPSTREAM_PIPE	0x02
 168#define PL2303_HXN_RESET_DOWNSTREAM_PIPE	0x01
 169
 170#define PL2303_HXN_FLOWCTRL_REG		0x0a
 171#define PL2303_HXN_FLOWCTRL_MASK	0x1c
 172#define PL2303_HXN_FLOWCTRL_NONE	0x1c
 173#define PL2303_HXN_FLOWCTRL_RTS_CTS	0x18
 174#define PL2303_HXN_FLOWCTRL_XON_XOFF	0x0c
 175
 176static int pl2303_set_break(struct usb_serial_port *port, bool enable);
 177
 178enum pl2303_type {
 179	TYPE_H,
 180	TYPE_HX,
 181	TYPE_TA,
 182	TYPE_TB,
 183	TYPE_HXD,
 184	TYPE_HXN,
 185	TYPE_COUNT
 186};
 187
 188struct pl2303_type_data {
 189	const char *name;
 190	speed_t max_baud_rate;
 191	unsigned long quirks;
 192	unsigned int no_autoxonxoff:1;
 193	unsigned int no_divisors:1;
 194	unsigned int alt_divisors:1;
 195};
 196
 197struct pl2303_serial_private {
 198	const struct pl2303_type_data *type;
 199	unsigned long quirks;
 200};
 201
 202struct pl2303_private {
 203	spinlock_t lock;
 204	u8 line_control;
 205	u8 line_status;
 206
 207	u8 line_settings[7];
 208};
 209
 210static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 211	[TYPE_H] = {
 212		.name			= "H",
 213		.max_baud_rate		= 1228800,
 214		.quirks			= PL2303_QUIRK_LEGACY,
 215		.no_autoxonxoff		= true,
 216	},
 217	[TYPE_HX] = {
 218		.name			= "HX",
 219		.max_baud_rate		= 6000000,
 220	},
 221	[TYPE_TA] = {
 222		.name			= "TA",
 223		.max_baud_rate		= 6000000,
 224		.alt_divisors		= true,
 225	},
 226	[TYPE_TB] = {
 227		.name			= "TB",
 228		.max_baud_rate		= 12000000,
 229		.alt_divisors		= true,
 230	},
 231	[TYPE_HXD] = {
 232		.name			= "HXD",
 233		.max_baud_rate		= 12000000,
 234	},
 235	[TYPE_HXN] = {
 236		.name			= "G",
 237		.max_baud_rate		= 12000000,
 238		.no_divisors		= true,
 239	},
 240};
 241
 242static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 243							unsigned char buf[1])
 244{
 245	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 246	struct device *dev = &serial->interface->dev;
 247	u8 request;
 248	int res;
 249
 250	if (spriv->type == &pl2303_type_data[TYPE_HXN])
 251		request = VENDOR_READ_NREQUEST;
 252	else
 253		request = VENDOR_READ_REQUEST;
 254
 255	res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 256			request, VENDOR_READ_REQUEST_TYPE,
 257			value, 0, buf, 1, 100);
 258	if (res != 1) {
 259		dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 260								value, res);
 261		if (res >= 0)
 262			res = -EIO;
 263
 264		return res;
 265	}
 266
 267	dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 268
 269	return 0;
 270}
 271
 272static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 273{
 274	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 275	struct device *dev = &serial->interface->dev;
 276	u8 request;
 277	int res;
 278
 279	dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 280
 281	if (spriv->type == &pl2303_type_data[TYPE_HXN])
 282		request = VENDOR_WRITE_NREQUEST;
 283	else
 284		request = VENDOR_WRITE_REQUEST;
 285
 286	res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 287			request, VENDOR_WRITE_REQUEST_TYPE,
 288			value, index, NULL, 0, 100);
 289	if (res) {
 290		dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 291								value, res);
 292		return res;
 293	}
 294
 295	return 0;
 296}
 297
 298static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
 299{
 300	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 301	int ret = 0;
 302	u8 *buf;
 303
 304	buf = kmalloc(1, GFP_KERNEL);
 305	if (!buf)
 306		return -ENOMEM;
 307
 308	if (spriv->type == &pl2303_type_data[TYPE_HXN])
 309		ret = pl2303_vendor_read(serial, reg, buf);
 310	else
 311		ret = pl2303_vendor_read(serial, reg | 0x80, buf);
 312
 313	if (ret)
 314		goto out_free;
 315
 316	*buf &= ~mask;
 317	*buf |= val & mask;
 318
 319	ret = pl2303_vendor_write(serial, reg, *buf);
 320out_free:
 321	kfree(buf);
 322
 323	return ret;
 324}
 325
 326static int pl2303_probe(struct usb_serial *serial,
 327					const struct usb_device_id *id)
 328{
 329	usb_set_serial_data(serial, (void *)id->driver_info);
 330
 331	return 0;
 332}
 333
 334/*
 335 * Use interrupt endpoint from first interface if available.
 336 *
 337 * This is needed due to the looney way its endpoints are set up.
 338 */
 339static int pl2303_endpoint_hack(struct usb_serial *serial,
 340					struct usb_serial_endpoints *epds)
 341{
 342	struct usb_interface *interface = serial->interface;
 343	struct usb_device *dev = serial->dev;
 344	struct device *ddev = &interface->dev;
 345	struct usb_host_interface *iface_desc;
 346	struct usb_endpoint_descriptor *endpoint;
 347	unsigned int i;
 348
 349	if (interface == dev->actconfig->interface[0])
 350		return 0;
 351
 352	/* check out the endpoints of the other interface */
 353	iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 354
 355	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 356		endpoint = &iface_desc->endpoint[i].desc;
 357
 358		if (!usb_endpoint_is_int_in(endpoint))
 359			continue;
 360
 361		dev_dbg(ddev, "found interrupt in on separate interface\n");
 362		if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
 363			epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
 364	}
 365
 366	return 0;
 367}
 368
 369static int pl2303_calc_num_ports(struct usb_serial *serial,
 370					struct usb_serial_endpoints *epds)
 371{
 372	unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
 373	struct device *dev = &serial->interface->dev;
 374	int ret;
 375
 376	if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
 377		ret = pl2303_endpoint_hack(serial, epds);
 378		if (ret)
 379			return ret;
 380	}
 381
 382	if (epds->num_interrupt_in < 1) {
 383		dev_err(dev, "required interrupt-in endpoint missing\n");
 384		return -ENODEV;
 385	}
 386
 387	return 1;
 388}
 389
 390static bool pl2303_supports_hx_status(struct usb_serial *serial)
 391{
 392	int ret;
 393	u8 buf;
 394
 395	ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
 396			VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
 397			0, &buf, 1, 100, GFP_KERNEL);
 398
 399	return ret == 0;
 400}
 401
 402static int pl2303_detect_type(struct usb_serial *serial)
 403{
 404	struct usb_device_descriptor *desc = &serial->dev->descriptor;
 405	u16 bcdDevice, bcdUSB;
 406
 407	/*
 408	 * Legacy PL2303H, variants 0 and 1 (difference unknown).
 409	 */
 410	if (desc->bDeviceClass == 0x02)
 411		return TYPE_H;		/* variant 0 */
 412
 413	if (desc->bMaxPacketSize0 != 0x40) {
 414		if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
 415			return TYPE_H;	/* variant 1 */
 416
 417		return TYPE_H;		/* variant 0 */
 418	}
 419
 420	bcdDevice = le16_to_cpu(desc->bcdDevice);
 421	bcdUSB = le16_to_cpu(desc->bcdUSB);
 422
 423	switch (bcdUSB) {
 424	case 0x101:
 425		/* USB 1.0.1? Let's assume they meant 1.1... */
 426		fallthrough;
 427	case 0x110:
 428		switch (bcdDevice) {
 429		case 0x300:
 430			return TYPE_HX;
 431		case 0x400:
 432			return TYPE_HXD;
 433		default:
 434			return TYPE_HX;
 435		}
 436		break;
 437	case 0x200:
 438		switch (bcdDevice) {
 439		case 0x100:	/* GC */
 440		case 0x105:
 441			return TYPE_HXN;
 442		case 0x300:	/* GT / TA */
 443			if (pl2303_supports_hx_status(serial))
 444				return TYPE_TA;
 445			fallthrough;
 446		case 0x305:
 447		case 0x400:	/* GL */
 448		case 0x405:
 449			return TYPE_HXN;
 450		case 0x500:	/* GE / TB */
 451			if (pl2303_supports_hx_status(serial))
 452				return TYPE_TB;
 453			fallthrough;
 454		case 0x505:
 455		case 0x600:	/* GS */
 456		case 0x605:
 457		case 0x700:	/* GR */
 458		case 0x705:
 459			return TYPE_HXN;
 460		}
 461		break;
 462	}
 463
 464	dev_err(&serial->interface->dev,
 465			"unknown device type, please report to linux-usb@vger.kernel.org\n");
 466	return -ENODEV;
 467}
 468
 469static int pl2303_startup(struct usb_serial *serial)
 470{
 471	struct pl2303_serial_private *spriv;
 472	enum pl2303_type type;
 473	unsigned char *buf;
 474	int ret;
 475
 476	ret = pl2303_detect_type(serial);
 477	if (ret < 0)
 478		return ret;
 479
 480	type = ret;
 481	dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
 482
 483	spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 484	if (!spriv)
 485		return -ENOMEM;
 486
 487	spriv->type = &pl2303_type_data[type];
 488	spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 489	spriv->quirks |= spriv->type->quirks;
 490
 491	usb_set_serial_data(serial, spriv);
 492
 493	if (type != TYPE_HXN) {
 494		buf = kmalloc(1, GFP_KERNEL);
 495		if (!buf) {
 496			kfree(spriv);
 497			return -ENOMEM;
 498		}
 499
 500		pl2303_vendor_read(serial, 0x8484, buf);
 501		pl2303_vendor_write(serial, 0x0404, 0);
 502		pl2303_vendor_read(serial, 0x8484, buf);
 503		pl2303_vendor_read(serial, 0x8383, buf);
 504		pl2303_vendor_read(serial, 0x8484, buf);
 505		pl2303_vendor_write(serial, 0x0404, 1);
 506		pl2303_vendor_read(serial, 0x8484, buf);
 507		pl2303_vendor_read(serial, 0x8383, buf);
 508		pl2303_vendor_write(serial, 0, 1);
 509		pl2303_vendor_write(serial, 1, 0);
 510		if (spriv->quirks & PL2303_QUIRK_LEGACY)
 511			pl2303_vendor_write(serial, 2, 0x24);
 512		else
 513			pl2303_vendor_write(serial, 2, 0x44);
 514
 515		kfree(buf);
 516	}
 517
 518	return 0;
 519}
 520
 521static void pl2303_release(struct usb_serial *serial)
 522{
 523	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 524
 525	kfree(spriv);
 526}
 527
 528static int pl2303_port_probe(struct usb_serial_port *port)
 529{
 530	struct pl2303_private *priv;
 531
 532	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 533	if (!priv)
 534		return -ENOMEM;
 535
 536	spin_lock_init(&priv->lock);
 537
 538	usb_set_serial_port_data(port, priv);
 539
 540	port->port.drain_delay = 256;
 541
 542	return 0;
 543}
 544
 545static void pl2303_port_remove(struct usb_serial_port *port)
 546{
 547	struct pl2303_private *priv = usb_get_serial_port_data(port);
 548
 549	kfree(priv);
 550}
 551
 552static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 553{
 554	struct usb_device *dev = port->serial->dev;
 555	int retval;
 556
 557	dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 558
 559	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 560				 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 561				 value, 0, NULL, 0, 100);
 562	if (retval)
 563		dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 564
 565	return retval;
 566}
 567
 568/*
 569 * Returns the nearest supported baud rate that can be set directly without
 570 * using divisors.
 571 */
 572static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 573{
 574	static const speed_t baud_sup[] = {
 575		75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 576		14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 577		614400, 921600, 1228800, 2457600, 3000000, 6000000
 578	};
 579
 580	unsigned i;
 581
 582	for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 583		if (baud_sup[i] > baud)
 584			break;
 585	}
 586
 587	if (i == ARRAY_SIZE(baud_sup))
 588		baud = baud_sup[i - 1];
 589	else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 590		baud = baud_sup[i - 1];
 591	else
 592		baud = baud_sup[i];
 593
 594	return baud;
 595}
 596
 597/*
 598 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 599 *       use 9600 baud.
 600 */
 601static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 602								speed_t baud)
 603{
 604	put_unaligned_le32(baud, buf);
 605
 606	return baud;
 607}
 608
 609static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 610								speed_t baud)
 611{
 612	unsigned int baseline, mantissa, exponent;
 613
 614	/*
 615	 * Apparently the formula is:
 616	 *   baudrate = 12M * 32 / (mantissa * 4^exponent)
 617	 * where
 618	 *   mantissa = buf[8:0]
 619	 *   exponent = buf[11:9]
 620	 */
 621	baseline = 12000000 * 32;
 622	mantissa = baseline / baud;
 623	if (mantissa == 0)
 624		mantissa = 1;	/* Avoid dividing by zero if baud > 32*12M. */
 625	exponent = 0;
 626	while (mantissa >= 512) {
 627		if (exponent < 7) {
 628			mantissa >>= 2;	/* divide by 4 */
 629			exponent++;
 630		} else {
 631			/* Exponent is maxed. Trim mantissa and leave. */
 632			mantissa = 511;
 633			break;
 634		}
 635	}
 636
 637	buf[3] = 0x80;
 638	buf[2] = 0;
 639	buf[1] = exponent << 1 | mantissa >> 8;
 640	buf[0] = mantissa & 0xff;
 641
 642	/* Calculate and return the exact baud rate. */
 643	baud = (baseline / mantissa) >> (exponent << 1);
 644
 645	return baud;
 646}
 647
 648static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
 649								speed_t baud)
 650{
 651	unsigned int baseline, mantissa, exponent;
 652
 653	/*
 654	 * Apparently, for the TA version the formula is:
 655	 *   baudrate = 12M * 32 / (mantissa * 2^exponent)
 656	 * where
 657	 *   mantissa = buf[10:0]
 658	 *   exponent = buf[15:13 16]
 659	 */
 660	baseline = 12000000 * 32;
 661	mantissa = baseline / baud;
 662	if (mantissa == 0)
 663		mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 664	exponent = 0;
 665	while (mantissa >= 2048) {
 666		if (exponent < 15) {
 667			mantissa >>= 1; /* divide by 2 */
 668			exponent++;
 669		} else {
 670			/* Exponent is maxed. Trim mantissa and leave. */
 671			mantissa = 2047;
 672			break;
 673		}
 674	}
 675
 676	buf[3] = 0x80;
 677	buf[2] = exponent & 0x01;
 678	buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
 679	buf[0] = mantissa & 0xff;
 680
 681	/* Calculate and return the exact baud rate. */
 682	baud = (baseline / mantissa) >> exponent;
 683
 684	return baud;
 685}
 686
 687static void pl2303_encode_baud_rate(struct tty_struct *tty,
 688					struct usb_serial_port *port,
 689					u8 buf[4])
 690{
 691	struct usb_serial *serial = port->serial;
 692	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 693	speed_t	baud_sup;
 694	speed_t baud;
 695
 696	baud = tty_get_baud_rate(tty);
 697	dev_dbg(&port->dev, "baud requested = %u\n", baud);
 698	if (!baud)
 699		return;
 700
 701	if (spriv->type->max_baud_rate)
 702		baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 703	/*
 704	 * Use direct method for supported baud rates, otherwise use divisors.
 705	 * Newer chip types do not support divisor encoding.
 706	 */
 707	if (spriv->type->no_divisors)
 708		baud_sup = baud;
 709	else
 710		baud_sup = pl2303_get_supported_baud_rate(baud);
 711
 712	if (baud == baud_sup)
 713		baud = pl2303_encode_baud_rate_direct(buf, baud);
 714	else if (spriv->type->alt_divisors)
 715		baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
 716	else
 717		baud = pl2303_encode_baud_rate_divisor(buf, baud);
 718
 719	/* Save resulting baud rate */
 720	tty_encode_baud_rate(tty, baud, baud);
 721	dev_dbg(&port->dev, "baud set = %u\n", baud);
 722}
 723
 724static int pl2303_get_line_request(struct usb_serial_port *port,
 725							unsigned char buf[7])
 726{
 727	struct usb_device *udev = port->serial->dev;
 728	int ret;
 729
 730	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 731				GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 732				0, 0, buf, 7, 100);
 733	if (ret != 7) {
 734		dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 735
 736		if (ret >= 0)
 737			ret = -EIO;
 738
 739		return ret;
 740	}
 741
 742	dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 743
 744	return 0;
 745}
 746
 747static int pl2303_set_line_request(struct usb_serial_port *port,
 748							unsigned char buf[7])
 749{
 750	struct usb_device *udev = port->serial->dev;
 751	int ret;
 752
 753	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 754				SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 755				0, 0, buf, 7, 100);
 756	if (ret < 0) {
 757		dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 758		return ret;
 759	}
 760
 761	dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 762
 763	return 0;
 764}
 765
 766static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
 767{
 768	bool ixon_change;
 769
 770	ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
 771			a->c_cc[VSTART] != b->c_cc[VSTART] ||
 772			a->c_cc[VSTOP] != b->c_cc[VSTOP];
 773
 774	return tty_termios_hw_change(a, b) || ixon_change;
 775}
 776
 777static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
 778{
 779	if (!I_IXON(tty) || I_IXANY(tty))
 780		return false;
 781
 782	if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
 783		return false;
 784
 785	if (type->no_autoxonxoff)
 786		return false;
 787
 788	return true;
 789}
 790
 791static void pl2303_set_termios(struct tty_struct *tty,
 792			       struct usb_serial_port *port,
 793			       const struct ktermios *old_termios)
 794{
 795	struct usb_serial *serial = port->serial;
 796	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 797	struct pl2303_private *priv = usb_get_serial_port_data(port);
 798	unsigned long flags;
 799	unsigned char *buf;
 800	int ret;
 801	u8 control;
 802
 803	if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
 804		return;
 805
 806	buf = kzalloc(7, GFP_KERNEL);
 807	if (!buf) {
 808		/* Report back no change occurred */
 809		if (old_termios)
 810			tty->termios = *old_termios;
 811		return;
 812	}
 813
 814	pl2303_get_line_request(port, buf);
 815
 816	buf[6] = tty_get_char_size(tty->termios.c_cflag);
 817	dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 818
 819	/* For reference buf[0]:buf[3] baud rate value */
 820	pl2303_encode_baud_rate(tty, port, &buf[0]);
 821
 822	/* For reference buf[4]=0 is 1 stop bits */
 823	/* For reference buf[4]=1 is 1.5 stop bits */
 824	/* For reference buf[4]=2 is 2 stop bits */
 825	if (C_CSTOPB(tty)) {
 826		/*
 827		 * NOTE: Comply with "real" UARTs / RS232:
 828		 *       use 1.5 instead of 2 stop bits with 5 data bits
 829		 */
 830		if (C_CSIZE(tty) == CS5) {
 831			buf[4] = 1;
 832			dev_dbg(&port->dev, "stop bits = 1.5\n");
 833		} else {
 834			buf[4] = 2;
 835			dev_dbg(&port->dev, "stop bits = 2\n");
 836		}
 837	} else {
 838		buf[4] = 0;
 839		dev_dbg(&port->dev, "stop bits = 1\n");
 840	}
 841
 842	if (C_PARENB(tty)) {
 843		/* For reference buf[5]=0 is none parity */
 844		/* For reference buf[5]=1 is odd parity */
 845		/* For reference buf[5]=2 is even parity */
 846		/* For reference buf[5]=3 is mark parity */
 847		/* For reference buf[5]=4 is space parity */
 848		if (C_PARODD(tty)) {
 849			if (C_CMSPAR(tty)) {
 850				buf[5] = 3;
 851				dev_dbg(&port->dev, "parity = mark\n");
 852			} else {
 853				buf[5] = 1;
 854				dev_dbg(&port->dev, "parity = odd\n");
 855			}
 856		} else {
 857			if (C_CMSPAR(tty)) {
 858				buf[5] = 4;
 859				dev_dbg(&port->dev, "parity = space\n");
 860			} else {
 861				buf[5] = 2;
 862				dev_dbg(&port->dev, "parity = even\n");
 863			}
 864		}
 865	} else {
 866		buf[5] = 0;
 867		dev_dbg(&port->dev, "parity = none\n");
 868	}
 869
 870	/*
 871	 * Some PL2303 are known to lose bytes if you change serial settings
 872	 * even to the same values as before. Thus we actually need to filter
 873	 * in this specific case.
 874	 *
 875	 * Note that the tty_termios_hw_change check above is not sufficient
 876	 * as a previously requested baud rate may differ from the one
 877	 * actually used (and stored in old_termios).
 878	 *
 879	 * NOTE: No additional locking needed for line_settings as it is
 880	 *       only used in set_termios, which is serialised against itself.
 881	 */
 882	if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 883		ret = pl2303_set_line_request(port, buf);
 884		if (!ret)
 885			memcpy(priv->line_settings, buf, 7);
 886	}
 887
 888	/* change control lines if we are switching to or from B0 */
 889	spin_lock_irqsave(&priv->lock, flags);
 890	control = priv->line_control;
 891	if (C_BAUD(tty) == B0)
 892		priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 893	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 894		priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 895	if (control != priv->line_control) {
 896		control = priv->line_control;
 897		spin_unlock_irqrestore(&priv->lock, flags);
 898		pl2303_set_control_lines(port, control);
 899	} else {
 900		spin_unlock_irqrestore(&priv->lock, flags);
 901	}
 902
 903	if (C_CRTSCTS(tty)) {
 904		if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 905			pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
 906		} else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 907			pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 908					PL2303_HXN_FLOWCTRL_MASK,
 909					PL2303_HXN_FLOWCTRL_RTS_CTS);
 910		} else {
 911			pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
 912		}
 913	} else if (pl2303_enable_xonxoff(tty, spriv->type)) {
 914		if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 915			pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 916					PL2303_HXN_FLOWCTRL_MASK,
 917					PL2303_HXN_FLOWCTRL_XON_XOFF);
 918		} else {
 919			pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
 920		}
 921	} else {
 922		if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 923			pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 924					PL2303_HXN_FLOWCTRL_MASK,
 925					PL2303_HXN_FLOWCTRL_NONE);
 926		} else {
 927			pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
 928		}
 929	}
 930
 931	kfree(buf);
 932}
 933
 934static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 935{
 936	struct pl2303_private *priv = usb_get_serial_port_data(port);
 937	unsigned long flags;
 938	u8 control;
 939
 940	spin_lock_irqsave(&priv->lock, flags);
 941	if (on)
 942		priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 943	else
 944		priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 945	control = priv->line_control;
 946	spin_unlock_irqrestore(&priv->lock, flags);
 947
 948	pl2303_set_control_lines(port, control);
 949}
 950
 951static void pl2303_close(struct usb_serial_port *port)
 952{
 953	usb_serial_generic_close(port);
 954	usb_kill_urb(port->interrupt_in_urb);
 955	pl2303_set_break(port, false);
 956}
 957
 958static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 959{
 960	struct usb_serial *serial = port->serial;
 961	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 962	int result;
 963
 964	if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 965		usb_clear_halt(serial->dev, port->write_urb->pipe);
 966		usb_clear_halt(serial->dev, port->read_urb->pipe);
 967	} else {
 968		/* reset upstream data pipes */
 969		if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 970			pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
 971					PL2303_HXN_RESET_UPSTREAM_PIPE |
 972					PL2303_HXN_RESET_DOWNSTREAM_PIPE);
 973		} else {
 974			pl2303_vendor_write(serial, 8, 0);
 975			pl2303_vendor_write(serial, 9, 0);
 976		}
 977	}
 978
 979	/* Setup termios */
 980	if (tty)
 981		pl2303_set_termios(tty, port, NULL);
 982
 983	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 984	if (result) {
 985		dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
 986			result);
 987		return result;
 988	}
 989
 990	result = usb_serial_generic_open(tty, port);
 991	if (result) {
 992		usb_kill_urb(port->interrupt_in_urb);
 993		return result;
 994	}
 995
 996	return 0;
 997}
 998
 999static int pl2303_tiocmset(struct tty_struct *tty,
1000			   unsigned int set, unsigned int clear)
1001{
1002	struct usb_serial_port *port = tty->driver_data;
1003	struct pl2303_private *priv = usb_get_serial_port_data(port);
1004	unsigned long flags;
1005	u8 control;
1006	int ret;
1007
1008	spin_lock_irqsave(&priv->lock, flags);
1009	if (set & TIOCM_RTS)
1010		priv->line_control |= CONTROL_RTS;
1011	if (set & TIOCM_DTR)
1012		priv->line_control |= CONTROL_DTR;
1013	if (clear & TIOCM_RTS)
1014		priv->line_control &= ~CONTROL_RTS;
1015	if (clear & TIOCM_DTR)
1016		priv->line_control &= ~CONTROL_DTR;
1017	control = priv->line_control;
1018	spin_unlock_irqrestore(&priv->lock, flags);
1019
1020	ret = pl2303_set_control_lines(port, control);
1021	if (ret)
1022		return usb_translate_errors(ret);
1023
1024	return 0;
1025}
1026
1027static int pl2303_tiocmget(struct tty_struct *tty)
1028{
1029	struct usb_serial_port *port = tty->driver_data;
1030	struct pl2303_private *priv = usb_get_serial_port_data(port);
1031	unsigned long flags;
1032	unsigned int mcr;
1033	unsigned int status;
1034	unsigned int result;
1035
1036	spin_lock_irqsave(&priv->lock, flags);
1037	mcr = priv->line_control;
1038	status = priv->line_status;
1039	spin_unlock_irqrestore(&priv->lock, flags);
1040
1041	result = ((mcr & CONTROL_DTR)		? TIOCM_DTR : 0)
1042		  | ((mcr & CONTROL_RTS)	? TIOCM_RTS : 0)
1043		  | ((status & UART_CTS)	? TIOCM_CTS : 0)
1044		  | ((status & UART_DSR)	? TIOCM_DSR : 0)
1045		  | ((status & UART_RING)	? TIOCM_RI  : 0)
1046		  | ((status & UART_DCD)	? TIOCM_CD  : 0);
1047
1048	dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1049
1050	return result;
1051}
1052
1053static int pl2303_carrier_raised(struct usb_serial_port *port)
1054{
1055	struct pl2303_private *priv = usb_get_serial_port_data(port);
1056
1057	if (priv->line_status & UART_DCD)
1058		return 1;
1059
1060	return 0;
1061}
1062
1063static int pl2303_set_break(struct usb_serial_port *port, bool enable)
1064{
1065	struct usb_serial *serial = port->serial;
1066	u16 state;
1067	int result;
1068
1069	if (enable)
1070		state = BREAK_ON;
1071	else
1072		state = BREAK_OFF;
1073
1074	dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1075			state == BREAK_OFF ? "off" : "on");
1076
1077	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1078				 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1079				 0, NULL, 0, 100);
1080	if (result) {
1081		dev_err(&port->dev, "error sending break = %d\n", result);
1082		return result;
1083	}
1084
1085	return 0;
1086}
1087
1088static int pl2303_break_ctl(struct tty_struct *tty, int state)
1089{
1090	struct usb_serial_port *port = tty->driver_data;
1091
1092	return pl2303_set_break(port, state);
1093}
1094
1095static void pl2303_update_line_status(struct usb_serial_port *port,
1096				      unsigned char *data,
1097				      unsigned int actual_length)
1098{
1099	struct usb_serial *serial = port->serial;
1100	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1101	struct pl2303_private *priv = usb_get_serial_port_data(port);
1102	struct tty_struct *tty;
1103	unsigned long flags;
1104	unsigned int status_idx = UART_STATE_INDEX;
1105	u8 status;
1106	u8 delta;
1107
1108	if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1109		status_idx = 0;
1110
1111	if (actual_length < status_idx + 1)
1112		return;
1113
1114	status = data[status_idx];
1115
1116	/* Save off the uart status for others to look at */
1117	spin_lock_irqsave(&priv->lock, flags);
1118	delta = priv->line_status ^ status;
1119	priv->line_status = status;
1120	spin_unlock_irqrestore(&priv->lock, flags);
1121
1122	if (status & UART_BREAK_ERROR)
1123		usb_serial_handle_break(port);
1124
1125	if (delta & UART_STATE_MSR_MASK) {
1126		if (delta & UART_CTS)
1127			port->icount.cts++;
1128		if (delta & UART_DSR)
1129			port->icount.dsr++;
1130		if (delta & UART_RING)
1131			port->icount.rng++;
1132		if (delta & UART_DCD) {
1133			port->icount.dcd++;
1134			tty = tty_port_tty_get(&port->port);
1135			if (tty) {
1136				usb_serial_handle_dcd_change(port, tty,
1137							status & UART_DCD);
1138				tty_kref_put(tty);
1139			}
1140		}
1141
1142		wake_up_interruptible(&port->port.delta_msr_wait);
1143	}
1144}
1145
1146static void pl2303_read_int_callback(struct urb *urb)
1147{
1148	struct usb_serial_port *port =  urb->context;
1149	unsigned char *data = urb->transfer_buffer;
1150	unsigned int actual_length = urb->actual_length;
1151	int status = urb->status;
1152	int retval;
1153
1154	switch (status) {
1155	case 0:
1156		/* success */
1157		break;
1158	case -ECONNRESET:
1159	case -ENOENT:
1160	case -ESHUTDOWN:
1161		/* this urb is terminated, clean up */
1162		dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1163			__func__, status);
1164		return;
1165	default:
1166		dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1167			__func__, status);
1168		goto exit;
1169	}
1170
1171	usb_serial_debug_data(&port->dev, __func__,
1172			      urb->actual_length, urb->transfer_buffer);
1173
1174	pl2303_update_line_status(port, data, actual_length);
1175
1176exit:
1177	retval = usb_submit_urb(urb, GFP_ATOMIC);
1178	if (retval) {
1179		dev_err(&port->dev,
1180			"%s - usb_submit_urb failed with result %d\n",
1181			__func__, retval);
1182	}
1183}
1184
1185static void pl2303_process_read_urb(struct urb *urb)
1186{
1187	struct usb_serial_port *port = urb->context;
1188	struct pl2303_private *priv = usb_get_serial_port_data(port);
1189	unsigned char *data = urb->transfer_buffer;
1190	char tty_flag = TTY_NORMAL;
1191	unsigned long flags;
1192	u8 line_status;
1193	int i;
1194
1195	/* update line status */
1196	spin_lock_irqsave(&priv->lock, flags);
1197	line_status = priv->line_status;
1198	priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1199	spin_unlock_irqrestore(&priv->lock, flags);
1200
1201	if (!urb->actual_length)
1202		return;
1203
1204	/*
1205	 * Break takes precedence over parity, which takes precedence over
1206	 * framing errors.
1207	 */
1208	if (line_status & UART_BREAK_ERROR)
1209		tty_flag = TTY_BREAK;
1210	else if (line_status & UART_PARITY_ERROR)
1211		tty_flag = TTY_PARITY;
1212	else if (line_status & UART_FRAME_ERROR)
1213		tty_flag = TTY_FRAME;
1214
1215	if (tty_flag != TTY_NORMAL)
1216		dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1217								tty_flag);
1218	/* overrun is special, not associated with a char */
1219	if (line_status & UART_OVERRUN_ERROR)
1220		tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1221
1222	if (port->sysrq) {
1223		for (i = 0; i < urb->actual_length; ++i)
1224			if (!usb_serial_handle_sysrq_char(port, data[i]))
1225				tty_insert_flip_char(&port->port, data[i],
1226						tty_flag);
1227	} else {
1228		tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1229							urb->actual_length);
1230	}
1231
1232	tty_flip_buffer_push(&port->port);
1233}
1234
1235static struct usb_serial_driver pl2303_device = {
1236	.driver = {
1237		.owner =	THIS_MODULE,
1238		.name =		"pl2303",
1239	},
1240	.id_table =		id_table,
1241	.num_bulk_in =		1,
1242	.num_bulk_out =		1,
1243	.num_interrupt_in =	0,	/* see pl2303_calc_num_ports */
1244	.bulk_in_size =		256,
1245	.bulk_out_size =	256,
1246	.open =			pl2303_open,
1247	.close =		pl2303_close,
1248	.dtr_rts =		pl2303_dtr_rts,
1249	.carrier_raised =	pl2303_carrier_raised,
1250	.break_ctl =		pl2303_break_ctl,
1251	.set_termios =		pl2303_set_termios,
1252	.tiocmget =		pl2303_tiocmget,
1253	.tiocmset =		pl2303_tiocmset,
1254	.tiocmiwait =		usb_serial_generic_tiocmiwait,
1255	.process_read_urb =	pl2303_process_read_urb,
1256	.read_int_callback =	pl2303_read_int_callback,
1257	.probe =		pl2303_probe,
1258	.calc_num_ports =	pl2303_calc_num_ports,
1259	.attach =		pl2303_startup,
1260	.release =		pl2303_release,
1261	.port_probe =		pl2303_port_probe,
1262	.port_remove =		pl2303_port_remove,
1263};
1264
1265static struct usb_serial_driver * const serial_drivers[] = {
1266	&pl2303_device, NULL
1267};
1268
1269module_usb_serial_driver(serial_drivers, id_table);
1270
1271MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1272MODULE_LICENSE("GPL v2");