主机:Gentoo Linux 11.2
内核版本：Linux 3.0.6
原创作品，转载请标明出处http://blog.csdn.net/yming0221/article/details/7194988
以前在Ubuntu下USB转串口驱动已经编译进内核，而编译的Gentoo内核没有编译进去，这里将内核中PL2303驱动 copy出来单独编译出pl2303.ko然后将其复制进/var/lib/(内核版本)/drivers/usb/serial/目录下
然后使用命令
depmod
modprobe pl2303
然后将usb转串口接口插入usb，使用命令查看dmesg | tail查看如下
查看内核中驱动，看到usbserial.ko驱动，下面单独编译pl2303.ko
从内核中拷贝的pl2303.h
/* * Prolific PL2303 USB to serial adaptor driver header file
*
*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.
*
*/
#define BENQ_VENDOR_ID0x04a5
#define BENQ_PRODUCT_ID_S810x4027
#define PL2303_VENDOR_ID0x067b
#define PL2303_PRODUCT_ID0x2303
#define PL2303_PRODUCT_ID_RSAQ20x04bb
#define PL2303_PRODUCT_ID_DCU110x1234
#define PL2303_PRODUCT_ID_PHAROS0xaaa0
#define PL2303_PRODUCT_ID_RSAQ30xaaa2
#define PL2303_PRODUCT_ID_ALDIGA0x0611
#define PL2303_PRODUCT_ID_MMX0x0612
#define PL2303_PRODUCT_ID_GPRS0x0609
#define PL2303_PRODUCT_ID_HCR3310x331a
#define PL2303_PRODUCT_ID_MOTOROLA0x0307
#define ATEN_VENDOR_ID0x0557
#define ATEN_VENDOR_ID20x0547
#define ATEN_PRODUCT_ID0x2008
#define IODATA_VENDOR_ID0x04bb
#define IODATA_PRODUCT_ID0x0a03
#define IODATA_PRODUCT_ID_RSAQ50x0a0e
#define ELCOM_VENDOR_ID0x056e
#define ELCOM_PRODUCT_ID0x5003
#define ELCOM_PRODUCT_ID_UCSGT0x5004
#define ITEGNO_VENDOR_ID0x0eba
#define ITEGNO_PRODUCT_ID0x1080
#define ITEGNO_PRODUCT_ID_20800x2080
#define MA620_VENDOR_ID0x0df7
#define MA620_PRODUCT_ID0x0620
#define RATOC_VENDOR_ID0x0584
#define RATOC_PRODUCT_ID0xb000
#define TRIPP_VENDOR_ID0x2478
#define TRIPP_PRODUCT_ID0x2008
#define RADIOSHACK_VENDOR_ID0x1453
#define RADIOSHACK_PRODUCT_ID0x4026
#define DCU10_VENDOR_ID0x0731
#define DCU10_PRODUCT_ID0x0528
#define SITECOM_VENDOR_ID0x6189
#define SITECOM_PRODUCT_ID0x2068
/* Alcatel OT535/735 USB cable */
#define ALCATEL_VENDOR_ID0x11f7
#define ALCATEL_PRODUCT_ID0x02df
/* Samsung I330 phone cradle */
#define SAMSUNG_VENDOR_ID0x04e8
#define SAMSUNG_PRODUCT_ID0x8001
#define SIEMENS_VENDOR_ID0x11f5
#define SIEMENS_PRODUCT_ID_SX10x0001
#define SIEMENS_PRODUCT_ID_X650x0003
#define SIEMENS_PRODUCT_ID_X750x0004
#define SIEMENS_PRODUCT_ID_EF810x0005
#define SYNTECH_VENDOR_ID0x0745
#define SYNTECH_PRODUCT_ID0x0001
/* Nokia CA-42 Cable */
#define NOKIA_CA42_VENDOR_ID0x078b
#define NOKIA_CA42_PRODUCT_ID0x1234
/* CA-42 CLONE Cable www.ca-42.com chipset: Prolific Technology Inc */
#define CA_42_CA42_VENDOR_ID0x10b5
#define CA_42_CA42_PRODUCT_ID0xac70
#define SAGEM_VENDOR_ID0x079b
#define SAGEM_PRODUCT_ID0x0027
/* Leadtek GPS 9531 (ID 0413:2101) */
#define LEADTEK_VENDOR_ID0x0413
#define LEADTEK_9531_PRODUCT_ID0x2101
/* USB GSM cable from Speed Dragon Multimedia, Ltd */
#define SPEEDDRAGON_VENDOR_ID0x0e55
#define SPEEDDRAGON_PRODUCT_ID0x110b
/* DATAPILOT Universal-2 Phone Cable */
#define DATAPILOT_U2_VENDOR_ID0x0731
#define DATAPILOT_U2_PRODUCT_ID0x2003
/* Belkin "F5U257" Serial Adapter */
#define BELKIN_VENDOR_ID0x050d
#define BELKIN_PRODUCT_ID0x0257
/* Alcor Micro Corp. USB 2.0 TO RS-232 */
#define ALCOR_VENDOR_ID0x058F
#define ALCOR_PRODUCT_ID0x9720
/* Willcom WS002IN Data Driver (by NetIndex Inc.) */
#define WS002IN_VENDOR_ID0x11f6
#define WS002IN_PRODUCT_ID0x2001
/* Corega CG-USBRS232R Serial Adapter */
#define COREGA_VENDOR_ID0x07aa
#define COREGA_PRODUCT_ID0x002a
/* Y.C. Cable U.S.A., Inc - USB to RS-232 */
#define YCCABLE_VENDOR_ID0x05ad
#define YCCABLE_PRODUCT_ID0x0fba
/* "Superial" USB - Serial */
#define SUPERIAL_VENDOR_ID0x5372
#define SUPERIAL_PRODUCT_ID0x2303
/* Hewlett-Packard LD220-HP POS Pole Display */
#define HP_VENDOR_ID0x03f0
#define HP_LD220_PRODUCT_ID0x3524
/* Cressi Edy (diving computer) PC interface */
#define CRESSI_VENDOR_ID0x04b8
#define CRESSI_EDY_PRODUCT_ID0x0521
/* Zeagle dive computer interface */
#define ZEAGLE_VENDOR_ID0x04b8
#define ZEAGLE_N2ITION3_PRODUCT_ID0x0522
/* Sony, USB data cable for CMD-Jxx mobile phones */
#define SONY_VENDOR_ID0x054c
#define SONY_QN3USB_PRODUCT_ID0x0437
/* Sanwa KB-USB2 multimeter cable (ID: 11ad:0001) */
#define SANWA_VENDOR_ID0x11ad
#define SANWA_PRODUCT_ID0x0001
/* ADLINK ND-6530 RS232,RS485 and RS422 adapter */
#define ADLINK_VENDOR_ID0x0b63
#define ADLINK_ND6530_PRODUCT_ID0x6530
/* WinChipHead USB->RS 232 adapter */
#define WINCHIPHEAD_VENDOR_ID0x4348
#define WINCHIPHEAD_USBSER_PRODUCT_ID0x5523
pl2303.c代码
/* * Prolific PL2303 USB to serial adaptor driver * * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2003 IBM Corp. * * Original driver for 2.2.x by anonymous * *This program is free software; you can redistribute it and/or *modify it under the terms of the GNU General Public License version *2 as published by the Free Software Foundation. * * See Documentation/usb/usb-serial.txt for more information on using this * driver * */#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/serial.h>#include <linux/module.h>#include <linux/moduleparam.h>#include <linux/spinlock.h>#include <linux/uaccess.h>#include <linux/usb.h>#include <linux/usb/serial.h>#include "pl2303.h"/* * Version Information */#define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"static int debug;#define PL2303_CLOSING_WAIT(30*HZ)static const struct usb_device_id id_table[] = {{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },{ USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },{ USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },{ USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },{ USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },{ USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },{ USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },{ USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },{ USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },{ USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },{ USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },{ USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },{ USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },{ USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },{ USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },{ USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },{ USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },{ USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },{ USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },{ USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },{ USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },{ USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },{ USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },{ USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },{ USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },{ USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },{ USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },{ USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },{ USB_DEVICE(WINCHIPHEAD_VENDOR_ID, WINCHIPHEAD_USBSER_PRODUCT_ID) },{ }/* Terminating entry */};MODULE_DEVICE_TABLE(usb, id_table);static struct usb_driver pl2303_driver = {.name ="pl2303",.probe =usb_serial_probe,.disconnect =usb_serial_disconnect,.id_table =id_table,.suspend = usb_serial_suspend,.resume = usb_serial_resume,.no_dynamic_id = 1,.supports_autosuspend =1,};#define SET_LINE_REQUEST_TYPE0x21#define SET_LINE_REQUEST0x20#define SET_CONTROL_REQUEST_TYPE0x21#define SET_CONTROL_REQUEST0x22#define CONTROL_DTR0x01#define CONTROL_RTS0x02#define BREAK_REQUEST_TYPE0x21#define BREAK_REQUEST0x23#define BREAK_ON0xffff#define BREAK_OFF0x0000#define GET_LINE_REQUEST_TYPE0xa1#define GET_LINE_REQUEST0x21#define VENDOR_WRITE_REQUEST_TYPE0x40#define VENDOR_WRITE_REQUEST0x01#define VENDOR_READ_REQUEST_TYPE0xc0#define VENDOR_READ_REQUEST0x01#define UART_STATE0x08#define UART_STATE_TRANSIENT_MASK0x74#define UART_DCD0x01#define UART_DSR0x02#define UART_BREAK_ERROR0x04#define UART_RING0x08#define UART_FRAME_ERROR0x10#define UART_PARITY_ERROR0x20#define UART_OVERRUN_ERROR0x40#define UART_CTS0x80enum pl2303_type {type_0,/* don't know the difference between type 0 and */type_1,/* type 1, until someone from prolific tells us... */HX,/* HX version of the pl2303 chip */};struct pl2303_private {spinlock_t lock;wait_queue_head_t delta_msr_wait;u8 line_control;u8 line_status;enum pl2303_type type;};static int pl2303_vendor_read(__u16 value, __u16 index,struct usb_serial *serial, unsigned char *buf){int res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,value, index, buf, 1, 100);dbg("0x%x:0x%x:0x%x:0x%x %d - %x", VENDOR_READ_REQUEST_TYPE,VENDOR_READ_REQUEST, value, index, res, buf[0]);return res;}static int pl2303_vendor_write(__u16 value, __u16 index,struct usb_serial *serial){int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,value, index, NULL, 0, 100);dbg("0x%x:0x%x:0x%x:0x%x %d", VENDOR_WRITE_REQUEST_TYPE,VENDOR_WRITE_REQUEST, value, index, res);return res;}static int pl2303_startup(struct usb_serial *serial){struct pl2303_private *priv;enum pl2303_type type = type_0;unsigned char *buf;int i;buf = kmalloc(10, GFP_KERNEL);if (buf == NULL)return -ENOMEM;if (serial->dev->descriptor.bDeviceClass == 0x02)type = type_0;else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)type = HX;else if (serial->dev->descriptor.bDeviceClass == 0x00)type = type_1;else if (serial->dev->descriptor.bDeviceClass == 0xFF)type = type_1;dbg("device type: %d", type);for (i = 0; i < serial->num_ports; ++i) {priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);if (!priv)goto cleanup;spin_lock_init(&priv->lock);init_waitqueue_head(&priv->delta_msr_wait);priv->type = type;usb_set_serial_port_data(serial->port[i], priv);}pl2303_vendor_read(0x8484, 0, serial, buf);pl2303_vendor_write(0x0404, 0, serial);pl2303_vendor_read(0x8484, 0, serial, buf);pl2303_vendor_read(0x8383, 0, serial, buf);pl2303_vendor_read(0x8484, 0, serial, buf);pl2303_vendor_write(0x0404, 1, serial);pl2303_vendor_read(0x8484, 0, serial, buf);pl2303_vendor_read(0x8383, 0, serial, buf);pl2303_vendor_write(0, 1, serial);pl2303_vendor_write(1, 0, serial);if (type == HX)pl2303_vendor_write(2, 0x44, serial);elsepl2303_vendor_write(2, 0x24, serial);kfree(buf);return 0;cleanup:kfree(buf);for (--i; i >= 0; --i) {priv = usb_get_serial_port_data(serial->port[i]);kfree(priv);usb_set_serial_port_data(serial->port[i], NULL);}return -ENOMEM;}static int set_control_lines(struct usb_device *dev, u8 value){int retval;retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, value, 0, NULL, 0, 100);dbg("%s - value = %d, retval = %d", __func__, value, retval);return retval;}static void pl2303_set_termios(struct tty_struct *tty,struct usb_serial_port *port, struct ktermios *old_termios){struct usb_serial *serial = port->serial;struct pl2303_private *priv = usb_get_serial_port_data(port);unsigned long flags;unsigned int cflag;unsigned char *buf;int baud;int i;u8 control;const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 614400, 921600, 1228800, 2457600, 3000000, 6000000 };int baud_floor, baud_ceil;int k;dbg("%s - port %d", __func__, port->number);/* The PL2303 is reported to lose bytes if you change serial settings even to the same values as before. Thus we actually need to filter in this specific case */if (!tty_termios_hw_change(tty->termios, old_termios))return;cflag = tty->termios->c_cflag;buf = kzalloc(7, GFP_KERNEL);if (!buf) {dev_err(&port->dev, "%s - out of memory.\n", __func__);/* Report back no change occurred */*tty->termios = *old_termios;return;}i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 0, 0, buf, 7, 100);dbg("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);if (cflag & CSIZE) {switch (cflag & CSIZE) {case CS5:buf[6] = 5;break;case CS6:buf[6] = 6;break;case CS7:buf[6] = 7;break;default:case CS8:buf[6] = 8;break;}dbg("%s - data bits = %d", __func__, buf[6]);}/* For reference buf[0]:buf[3] baud rate value *//* NOTE: Only the values defined in baud_sup are supported ! * => if unsupported values are set, the PL2303 seems to use * 9600 baud (at least my PL2303X always does) */baud = tty_get_baud_rate(tty);dbg("%s - baud requested = %d", __func__, baud);if (baud) {/* Set baudrate to nearest supported value */for (k=0; k<ARRAY_SIZE(baud_sup); k++) {if (baud_sup[k] / baud) {baud_ceil = baud_sup[k];if (k==0) {baud = baud_ceil;} else {baud_floor = baud_sup[k-1];if ((baud_ceil % baud) > (baud % baud_floor))baud = baud_floor;elsebaud = baud_ceil;}break;}}if (baud > 1228800) {/* type_0, type_1 only support up to 1228800 baud */if (priv->type != HX)baud = 1228800;else if (baud > 6000000)baud = 6000000;}dbg("%s - baud set = %d", __func__, baud);if (baud <= 115200) {buf[0] = baud & 0xff;buf[1] = (baud >> 8) & 0xff;buf[2] = (baud >> 16) & 0xff;buf[3] = (baud >> 24) & 0xff;} else {/* apparently the formula for higher speeds is: * baudrate = 12M * 32 / (2^buf[1]) / buf[0] */unsigned tmp = 12*1000*1000*32 / baud;buf[3] = 0x80;buf[2] = 0;buf[1] = (tmp >= 256);while (tmp >= 256) {tmp >>= 2;buf[1] <<= 1;}if (tmp > 256) {tmp %= 256;}buf[0] = tmp;}}/* For reference buf[4]=0 is 1 stop bits *//* For reference buf[4]=1 is 1.5 stop bits *//* For reference buf[4]=2 is 2 stop bits */if (cflag & CSTOPB) {/* NOTE: Comply with "real" UARTs / RS232: * use 1.5 instead of 2 stop bits with 5 data bits */if ((cflag & CSIZE) == CS5) {buf[4] = 1;dbg("%s - stop bits = 1.5", __func__);} else {buf[4] = 2;dbg("%s - stop bits = 2", __func__);}} else {buf[4] = 0;dbg("%s - stop bits = 1", __func__);}if (cflag & PARENB) {/* For reference buf[5]=0 is none parity *//* For reference buf[5]=1 is odd parity *//* For reference buf[5]=2 is even parity *//* For reference buf[5]=3 is mark parity *//* For reference buf[5]=4 is space parity */if (cflag & PARODD) {if (cflag & CMSPAR) {buf[5] = 3;dbg("%s - parity = mark", __func__);} else {buf[5] = 1;dbg("%s - parity = odd", __func__);}} else {if (cflag & CMSPAR) {buf[5] = 4;dbg("%s - parity = space", __func__);} else {buf[5] = 2;dbg("%s - parity = even", __func__);}}} else {buf[5] = 0;dbg("%s - parity = none", __func__);}i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 0, 0, buf, 7, 100);dbg("0x21:0x20:0:0 %d", i);/* change control lines if we are switching to or from B0 */spin_lock_irqsave(&priv->lock, flags);control = priv->line_control;if ((cflag & CBAUD) == B0)priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);elsepriv->line_control |= (CONTROL_DTR | CONTROL_RTS);if (control != priv->line_control) {control = priv->line_control;spin_unlock_irqrestore(&priv->lock, flags);set_control_lines(serial->dev, control);} else {spin_unlock_irqrestore(&priv->lock, flags);}buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 0, 0, buf, 7, 100);dbg("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);if (cflag & CRTSCTS) {if (priv->type == HX)pl2303_vendor_write(0x0, 0x61, serial);elsepl2303_vendor_write(0x0, 0x41, serial);} else {pl2303_vendor_write(0x0, 0x0, serial);}/* Save resulting baud rate */if (baud)tty_encode_baud_rate(tty, baud, baud);kfree(buf);}static void pl2303_dtr_rts(struct usb_serial_port *port, int on){struct pl2303_private *priv = usb_get_serial_port_data(port);unsigned long flags;u8 control;spin_lock_irqsave(&priv->lock, flags);/* Change DTR and RTS */if (on)priv->line_control |= (CONTROL_DTR | CONTROL_RTS);elsepriv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);control = priv->line_control;spin_unlock_irqrestore(&priv->lock, flags);set_control_lines(port->serial->dev, control);}static void pl2303_close(struct usb_serial_port *port){dbg("%s - port %d", __func__, port->number);usb_serial_generic_close(port);usb_kill_urb(port->interrupt_in_urb);}static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port){struct ktermios tmp_termios;struct usb_serial *serial = port->serial;struct pl2303_private *priv = usb_get_serial_port_data(port);int result;dbg("%s - port %d", __func__, port->number);if (priv->type != HX) {usb_clear_halt(serial->dev, port->write_urb->pipe);usb_clear_halt(serial->dev, port->read_urb->pipe);} else {/* reset upstream data pipes */pl2303_vendor_write(8, 0, serial);pl2303_vendor_write(9, 0, serial);}/* Setup termios */if (tty)pl2303_set_termios(tty, port, &tmp_termios);dbg("%s - submitting read urb", __func__);result = usb_serial_generic_submit_read_urb(port, GFP_KERNEL);if (result) {pl2303_close(port);return -EPROTO;}dbg("%s - submitting interrupt urb", __func__);result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);if (result) {dev_err(&port->dev, "%s - failed submitting interrupt urb,"" error %d\n", __func__, result);pl2303_close(port);return -EPROTO;}port->port.drain_delay = 256;return 0;}static int pl2303_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear){struct usb_serial_port *port = tty->driver_data;struct pl2303_private *priv = usb_get_serial_port_data(port);unsigned long flags;u8 control;if (!usb_get_intfdata(port->serial->interface))return -ENODEV;spin_lock_irqsave(&priv->lock, flags);if (set & TIOCM_RTS)priv->line_control |= CONTROL_RTS;if (set & TIOCM_DTR)priv->line_control |= CONTROL_DTR;if (clear & TIOCM_RTS)priv->line_control &= ~CONTROL_RTS;if (clear & TIOCM_DTR)priv->line_control &= ~CONTROL_DTR;control = priv->line_control;spin_unlock_irqrestore(&priv->lock, flags);return set_control_lines(port->serial->dev, control);}static int pl2303_tiocmget(struct tty_struct *tty){struct usb_serial_port *port = tty->driver_data;struct pl2303_private *priv = usb_get_serial_port_data(port);unsigned long flags;unsigned int mcr;unsigned int status;unsigned int result;dbg("%s (%d)", __func__, port->number);if (!usb_get_intfdata(port->serial->interface))return -ENODEV;spin_lock_irqsave(&priv->lock, flags);mcr = priv->line_control;status = priv->line_status;spin_unlock_irqrestore(&priv->lock, flags);result = ((mcr & CONTROL_DTR)? TIOCM_DTR : 0) | ((mcr & CONTROL_RTS)? TIOCM_RTS : 0) | ((status & UART_CTS)? TIOCM_CTS : 0) | ((status & UART_DSR)? TIOCM_DSR : 0) | ((status & UART_RING)? TIOCM_RI : 0) | ((status & UART_DCD)? TIOCM_CD : 0);dbg("%s - result = %x", __func__, result);return result;}static int pl2303_carrier_raised(struct usb_serial_port *port){struct pl2303_private *priv = usb_get_serial_port_data(port);if (priv->line_status & UART_DCD)return 1;return 0;}static int wait_modem_info(struct usb_serial_port *port, unsigned int arg){struct pl2303_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) {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 & UART_RING)) || ((arg & TIOCM_DSR) && (changed & UART_DSR)) || ((arg & TIOCM_CD) && (changed & UART_DCD)) || ((arg & TIOCM_CTS) && (changed & UART_CTS))) {return 0;}prevstatus = status;}/* NOTREACHED */return 0;}static int pl2303_ioctl(struct tty_struct *tty,unsigned int cmd, unsigned long arg){struct serial_struct ser;struct usb_serial_port *port = tty->driver_data;dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);switch (cmd) {case TIOCGSERIAL:memset(&ser, 0, sizeof ser);ser.type = PORT_16654;ser.line = port->serial->minor;ser.port = port->number;ser.baud_base = 460800;if (copy_to_user((void __user *)arg, &ser, sizeof ser))return -EFAULT;return 0;case TIOCMIWAIT:dbg("%s (%d) TIOCMIWAIT", __func__, port->number);return wait_modem_info(port, arg);default:dbg("%s not supported = 0x%04x", __func__, cmd);break;}return -ENOIOCTLCMD;}static void pl2303_break_ctl(struct tty_struct *tty, int break_state){struct usb_serial_port *port = tty->driver_data;struct usb_serial *serial = port->serial;u16 state;int result;dbg("%s - port %d", __func__, port->number);if (break_state == 0)state = BREAK_OFF;elsestate = BREAK_ON;dbg("%s - turning break %s", __func__,state == BREAK_OFF ? "off" : "on");result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 0, NULL, 0, 100);if (result)dbg("%s - error sending break = %d", __func__, result);}static void pl2303_release(struct usb_serial *serial){int i;struct pl2303_private *priv;dbg("%s", __func__);for (i = 0; i < serial->num_ports; ++i) {priv = usb_get_serial_port_data(serial->port[i]);kfree(priv);}}static void pl2303_update_line_status(struct usb_serial_port *port, unsigned char *data, unsigned int actual_length){struct pl2303_private *priv = usb_get_serial_port_data(port);struct tty_struct *tty;unsigned long flags;u8 status_idx = UART_STATE;u8 length = UART_STATE + 1;u8 prev_line_status;u16 idv, idp;idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);if (idv == SIEMENS_VENDOR_ID) {if (idp == SIEMENS_PRODUCT_ID_X65 || idp == SIEMENS_PRODUCT_ID_SX1 || idp == SIEMENS_PRODUCT_ID_X75) {length = 1;status_idx = 0;}}if (actual_length < length)return;/* Save off the uart status for others to look at */spin_lock_irqsave(&priv->lock, flags);prev_line_status = priv->line_status;priv->line_status = data[status_idx];spin_unlock_irqrestore(&priv->lock, flags);if (priv->line_status & UART_BREAK_ERROR)usb_serial_handle_break(port);wake_up_interruptible(&priv->delta_msr_wait);tty = tty_port_tty_get(&port->port);if (!tty)return;if ((priv->line_status ^ prev_line_status) & UART_DCD)usb_serial_handle_dcd_change(port, tty,priv->line_status & UART_DCD);tty_kref_put(tty);}static void pl2303_read_int_callback(struct urb *urb){struct usb_serial_port *port = urb->context;unsigned char *data = urb->transfer_buffer;unsigned int actual_length = urb->actual_length;int status = urb->status;int retval;dbg("%s (%d)", __func__, port->number);switch (status) {case 0:/* success */break;case -ECONNRESET:case -ENOENT:case -ESHUTDOWN:/* this urb is terminated, clean up */dbg("%s - urb shutting down with status: %d", __func__, status);return;default:dbg("%s - nonzero urb status received: %d", __func__, status);goto exit;}usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length, urb->transfer_buffer);pl2303_update_line_status(port, data, actual_length);exit:retval = usb_submit_urb(urb, GFP_ATOMIC);if (retval)dev_err(&urb->dev->dev,"%s - usb_submit_urb failed with result %d\n",__func__, retval);}static void pl2303_process_read_urb(struct urb *urb){struct usb_serial_port *port = urb->context;struct pl2303_private *priv = usb_get_serial_port_data(port);struct tty_struct *tty;unsigned char *data = urb->transfer_buffer;char tty_flag = TTY_NORMAL;unsigned long flags;u8 line_status;int i;/* update line status */spin_lock_irqsave(&priv->lock, flags);line_status = priv->line_status;priv->line_status &= ~UART_STATE_TRANSIENT_MASK;spin_unlock_irqrestore(&priv->lock, flags);wake_up_interruptible(&priv->delta_msr_wait);if (!urb->actual_length)return;tty = tty_port_tty_get(&port->port);if (!tty)return;/* break takes precedence over parity, *//* which takes precedence over framing errors */if (line_status & UART_BREAK_ERROR)tty_flag = TTY_BREAK;else if (line_status & UART_PARITY_ERROR)tty_flag = TTY_PARITY;else if (line_status & UART_FRAME_ERROR)tty_flag = TTY_FRAME;dbg("%s - tty_flag = %d", __func__, tty_flag);/* overrun is special, not associated with a char */if (line_status & UART_OVERRUN_ERROR)tty_insert_flip_char(tty, 0, TTY_OVERRUN);if (port->port.console && port->sysrq) {for (i = 0; i < urb->actual_length; ++i)if (!usb_serial_handle_sysrq_char(port, data[i]))tty_insert_flip_char(tty, data[i], tty_flag);} else {tty_insert_flip_string_fixed_flag(tty, data, tty_flag,urb->actual_length);}tty_flip_buffer_push(tty);tty_kref_put(tty);}/* All of the device info needed for the PL2303 SIO serial converter */static struct usb_serial_driver pl2303_device = {.driver = {.owner =THIS_MODULE,.name ="pl2303",},.id_table =id_table,.usb_driver = &pl2303_driver,.num_ports =1,.bulk_in_size =256,.bulk_out_size =256,.open =pl2303_open,.close =pl2303_close,.dtr_rts = pl2303_dtr_rts,.carrier_raised =pl2303_carrier_raised,.ioctl =pl2303_ioctl,.break_ctl =pl2303_break_ctl,.set_termios =pl2303_set_termios,.tiocmget =pl2303_tiocmget,.tiocmset =pl2303_tiocmset,.process_read_urb =pl2303_process_read_urb,.read_int_callback =pl2303_read_int_callback,.attach =pl2303_startup,.release =pl2303_release,};static int __init pl2303_init(void){int retval;retval = usb_serial_register(&pl2303_device);if (retval)goto failed_usb_serial_register;retval = usb_register(&pl2303_driver);if (retval)goto failed_usb_register;printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");return 0;failed_usb_register:usb_serial_deregister(&pl2303_device);failed_usb_serial_register:return retval;}static void __exit pl2303_exit(void){usb_deregister(&pl2303_driver);usb_serial_deregister(&pl2303_device);}module_init(pl2303_init);module_exit(pl2303_exit);MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE("GPL");module_param(debug, bool, S_IRUGO | S_IWUSR);MODULE_PARM_DESC(debug, "Debug enabled or not");
Makefile文件：
#KVER = /usr/src/linuxKVER = /lib/modules/`uname -r`/buildCURDIR = $(shell pwd)# Kernel modulesobj-m := pl2303.obuild: kernel_moduleskernel_modules:$(MAKE) -C $(KVER) M=$(CURDIR) modulesclean:$(MAKE) -C $(KVER) M=$(CURDIR) clean