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alistair23-linux/drivers/usb/serial/pl2303.c
Michał Pecio 49bda21266 USB: pl2303: fix baud-rate divisor calculations 
This commit fixes the following issues:

1. The 9th bit of buf was believed to be the LSB of divisor's
exponent, but the hardware interprets it as MSB (9th bit) of the
mantissa. The exponent is actually one bit shorter and applies
to base 4, not 2 as previously believed.

2. Loop iterations doubled the exponent instead of incrementing.

3. The exponent wasn't checked for overflow.

4. The function returned requested rate instead of actual rate.

Due to issue #2, the old code deviated from the wrong formula
described in #1 and actually yielded correct rates when divisor
was lower than 4096 by using exponents of 0, 2 or 4 base-2,
interpreted as 0, 1, 2 base-4 with the 9th mantissa bit clear.
However, at 93.75 kbaud or less the rate turned out too slow
due to #2 or too fast due to #2 and #3.

I tested this patch by sending and validating 0x00,0x01,..,0xff
to an FTDI dongle at 234, 987, 2401, 9601, 31415, 115199, 250k,
500k, 750k, 1M, 1.5M, 3M+1 baud. All rates passed.

I also used pv to check speed at some rates unsupported by FTDI:
45 (the lowest possible), 2M, 4M, 5M and 6M-1. Looked sane.

Signed-off-by: Michal Pecio <michal.pecio@gmail.com>
Fixes: 399aa9a75a ("USB: pl2303: use divisors for unsupported baud
rates")
Cc: stable <stable@vger.kernel.org> # v3.18
[johan: update summary ]
Signed-off-by: Johan Hovold <johan@kernel.org>
2015-07-30 18:11:07 +02:00

966 lines
25 KiB
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/*
* 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/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 <asm/unaligned.h>
#include "pl2303.h"
#define PL2303_QUIRK_UART_STATE_IDX0 BIT(0)
#define PL2303_QUIRK_LEGACY BIT(1)
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(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
{ 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(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
{ 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(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
{ USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
{ USB_DEVICE(HP_VENDOR_ID, HP_LCM960_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(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
#define SET_LINE_REQUEST_TYPE 0x21
#define SET_LINE_REQUEST 0x20
#define SET_CONTROL_REQUEST_TYPE 0x21
#define SET_CONTROL_REQUEST 0x22
#define CONTROL_DTR 0x01
#define CONTROL_RTS 0x02
#define BREAK_REQUEST_TYPE 0x21
#define BREAK_REQUEST 0x23
#define BREAK_ON 0xffff
#define BREAK_OFF 0x0000
#define GET_LINE_REQUEST_TYPE 0xa1
#define GET_LINE_REQUEST 0x21
#define VENDOR_WRITE_REQUEST_TYPE 0x40
#define VENDOR_WRITE_REQUEST 0x01
#define VENDOR_READ_REQUEST_TYPE 0xc0
#define VENDOR_READ_REQUEST 0x01
#define UART_STATE_INDEX 8
#define UART_STATE_MSR_MASK 0x8b
#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
static void pl2303_set_break(struct usb_serial_port *port, bool enable);
enum pl2303_type {
TYPE_01, /* Type 0 and 1 (difference unknown) */
TYPE_HX, /* HX version of the pl2303 chip */
TYPE_COUNT
};
struct pl2303_type_data {
speed_t max_baud_rate;
unsigned long quirks;
};
struct pl2303_serial_private {
const struct pl2303_type_data *type;
unsigned long quirks;
};
struct pl2303_private {
spinlock_t lock;
u8 line_control;
u8 line_status;
u8 line_settings[7];
};
static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
[TYPE_01] = {
.max_baud_rate = 1228800,
.quirks = PL2303_QUIRK_LEGACY,
},
[TYPE_HX] = {
.max_baud_rate = 12000000,
},
};
static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
unsigned char buf[1])
{
struct device *dev = &serial->interface->dev;
int res;
res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
value, 0, buf, 1, 100);
if (res != 1) {
dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
value, res);
if (res >= 0)
res = -EIO;
return res;
}
dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
return 0;
}
static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
{
struct device *dev = &serial->interface->dev;
int res;
dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
value, index, NULL, 0, 100);
if (res) {
dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
value, res);
return res;
}
return 0;
}
static int pl2303_probe(struct usb_serial *serial,
const struct usb_device_id *id)
{
usb_set_serial_data(serial, (void *)id->driver_info);
return 0;
}
static int pl2303_startup(struct usb_serial *serial)
{
struct pl2303_serial_private *spriv;
enum pl2303_type type = TYPE_01;
unsigned char *buf;
spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
if (!spriv)
return -ENOMEM;
buf = kmalloc(1, GFP_KERNEL);
if (!buf) {
kfree(spriv);
return -ENOMEM;
}
if (serial->dev->descriptor.bDeviceClass == 0x02)
type = TYPE_01; /* type 0 */
else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
type = TYPE_HX;
else if (serial->dev->descriptor.bDeviceClass == 0x00)
type = TYPE_01; /* type 1 */
else if (serial->dev->descriptor.bDeviceClass == 0xFF)
type = TYPE_01; /* type 1 */
dev_dbg(&serial->interface->dev, "device type: %d\n", type);
spriv->type = &pl2303_type_data[type];
spriv->quirks = (unsigned long)usb_get_serial_data(serial);
spriv->quirks |= spriv->type->quirks;
usb_set_serial_data(serial, spriv);
pl2303_vendor_read(serial, 0x8484, buf);
pl2303_vendor_write(serial, 0x0404, 0);
pl2303_vendor_read(serial, 0x8484, buf);
pl2303_vendor_read(serial, 0x8383, buf);
pl2303_vendor_read(serial, 0x8484, buf);
pl2303_vendor_write(serial, 0x0404, 1);
pl2303_vendor_read(serial, 0x8484, buf);
pl2303_vendor_read(serial, 0x8383, buf);
pl2303_vendor_write(serial, 0, 1);
pl2303_vendor_write(serial, 1, 0);
if (spriv->quirks & PL2303_QUIRK_LEGACY)
pl2303_vendor_write(serial, 2, 0x24);
else
pl2303_vendor_write(serial, 2, 0x44);
kfree(buf);
return 0;
}
static void pl2303_release(struct usb_serial *serial)
{
struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
kfree(spriv);
}
static int pl2303_port_probe(struct usb_serial_port *port)
{
struct pl2303_private *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->lock);
usb_set_serial_port_data(port, priv);
port->port.drain_delay = 256;
return 0;
}
static int pl2303_port_remove(struct usb_serial_port *port)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
kfree(priv);
return 0;
}
static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
{
struct usb_device *dev = port->serial->dev;
int retval;
dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
value, 0, NULL, 0, 100);
if (retval)
dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
return retval;
}
/*
* Returns the nearest supported baud rate that can be set directly without
* using divisors.
*/
static speed_t pl2303_get_supported_baud_rate(speed_t baud)
{
static const speed_t 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
};
unsigned i;
for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
if (baud_sup[i] > baud)
break;
}
if (i == ARRAY_SIZE(baud_sup))
baud = baud_sup[i - 1];
else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
baud = baud_sup[i - 1];
else
baud = baud_sup[i];
return baud;
}
/*
* NOTE: If unsupported baud rates are set directly, the PL2303 seems to
* use 9600 baud.
*/
static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
speed_t baud)
{
put_unaligned_le32(baud, buf);
return baud;
}
static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
speed_t baud)
{
unsigned int baseline, mantissa, exponent;
/*
* Apparently the formula is:
* baudrate = 12M * 32 / (mantissa * 4^exponent)
* where
* mantissa = buf[8:0]
* exponent = buf[11:9]
*/
baseline = 12000000 * 32;
mantissa = baseline / baud;
if (mantissa == 0)
mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
exponent = 0;
while (mantissa >= 512) {
if (exponent < 7) {
mantissa >>= 2; /* divide by 4 */
exponent++;
} else {
/* Exponent is maxed. Trim mantissa and leave. */
mantissa = 511;
break;
}
}
buf[3] = 0x80;
buf[2] = 0;
buf[1] = exponent << 1 | mantissa >> 8;
buf[0] = mantissa & 0xff;
/* Calculate and return the exact baud rate. */
baud = (baseline / mantissa) >> (exponent << 1);
return baud;
}
static void pl2303_encode_baud_rate(struct tty_struct *tty,
struct usb_serial_port *port,
u8 buf[4])
{
struct usb_serial *serial = port->serial;
struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
speed_t baud_sup;
speed_t baud;
baud = tty_get_baud_rate(tty);
dev_dbg(&port->dev, "baud requested = %u\n", baud);
if (!baud)
return;
if (spriv->type->max_baud_rate)
baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
/*
* Use direct method for supported baud rates, otherwise use divisors.
*/
baud_sup = pl2303_get_supported_baud_rate(baud);
if (baud == baud_sup)
baud = pl2303_encode_baud_rate_direct(buf, baud);
else
baud = pl2303_encode_baud_rate_divisor(buf, baud);
/* Save resulting baud rate */
tty_encode_baud_rate(tty, baud, baud);
dev_dbg(&port->dev, "baud set = %u\n", baud);
}
static int pl2303_get_line_request(struct usb_serial_port *port,
unsigned char buf[7])
{
struct usb_device *udev = port->serial->dev;
int ret;
ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
if (ret != 7) {
dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
if (ret > 0)
ret = -EIO;
return ret;
}
dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
return 0;
}
static int pl2303_set_line_request(struct usb_serial_port *port,
unsigned char buf[7])
{
struct usb_device *udev = port->serial->dev;
int ret;
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
if (ret != 7) {
dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
if (ret > 0)
ret = -EIO;
return ret;
}
dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
return 0;
}
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_serial_private *spriv = usb_get_serial_data(serial);
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned char *buf;
int ret;
u8 control;
if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
return;
buf = kzalloc(7, GFP_KERNEL);
if (!buf) {
/* Report back no change occurred */
if (old_termios)
tty->termios = *old_termios;
return;
}
pl2303_get_line_request(port, buf);
switch (C_CSIZE(tty)) {
case CS5:
buf[6] = 5;
break;
case CS6:
buf[6] = 6;
break;
case CS7:
buf[6] = 7;
break;
default:
case CS8:
buf[6] = 8;
}
dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
/* For reference buf[0]:buf[3] baud rate value */
pl2303_encode_baud_rate(tty, port, &buf[0]);
/* 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 (C_CSTOPB(tty)) {
/*
* NOTE: Comply with "real" UARTs / RS232:
* use 1.5 instead of 2 stop bits with 5 data bits
*/
if (C_CSIZE(tty) == CS5) {
buf[4] = 1;
dev_dbg(&port->dev, "stop bits = 1.5\n");
} else {
buf[4] = 2;
dev_dbg(&port->dev, "stop bits = 2\n");
}
} else {
buf[4] = 0;
dev_dbg(&port->dev, "stop bits = 1\n");
}
if (C_PARENB(tty)) {
/* 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 (C_PARODD(tty)) {
if (C_CMSPAR(tty)) {
buf[5] = 3;
dev_dbg(&port->dev, "parity = mark\n");
} else {
buf[5] = 1;
dev_dbg(&port->dev, "parity = odd\n");
}
} else {
if (C_CMSPAR(tty)) {
buf[5] = 4;
dev_dbg(&port->dev, "parity = space\n");
} else {
buf[5] = 2;
dev_dbg(&port->dev, "parity = even\n");
}
}
} else {
buf[5] = 0;
dev_dbg(&port->dev, "parity = none\n");
}
/*
* Some PL2303 are known 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.
*
* Note that the tty_termios_hw_change check above is not sufficient
* as a previously requested baud rate may differ from the one
* actually used (and stored in old_termios).
*
* NOTE: No additional locking needed for line_settings as it is
* only used in set_termios, which is serialised against itself.
*/
if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
ret = pl2303_set_line_request(port, buf);
if (!ret)
memcpy(priv->line_settings, buf, 7);
}
/* change control lines if we are switching to or from B0 */
spin_lock_irqsave(&priv->lock, flags);
control = priv->line_control;
if (C_BAUD(tty) == B0)
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
if (control != priv->line_control) {
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
pl2303_set_control_lines(port, control);
} else {
spin_unlock_irqrestore(&priv->lock, flags);
}
if (C_CRTSCTS(tty)) {
if (spriv->quirks & PL2303_QUIRK_LEGACY)
pl2303_vendor_write(serial, 0x0, 0x41);
else
pl2303_vendor_write(serial, 0x0, 0x61);
} else {
pl2303_vendor_write(serial, 0x0, 0x0);
}
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);
if (on)
priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
else
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
pl2303_set_control_lines(port, control);
}
static void pl2303_close(struct usb_serial_port *port)
{
usb_serial_generic_close(port);
usb_kill_urb(port->interrupt_in_urb);
pl2303_set_break(port, false);
}
static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
int result;
if (spriv->quirks & PL2303_QUIRK_LEGACY) {
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(serial, 8, 0);
pl2303_vendor_write(serial, 9, 0);
}
/* Setup termios */
if (tty)
pl2303_set_termios(tty, port, NULL);
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
result);
return result;
}
result = usb_serial_generic_open(tty, port);
if (result) {
usb_kill_urb(port->interrupt_in_urb);
return result;
}
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;
int ret;
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);
ret = pl2303_set_control_lines(port, control);
if (ret)
return usb_translate_errors(ret);
return 0;
}
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;
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);
dev_dbg(&port->dev, "%s - result = %x\n", __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 pl2303_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct serial_struct ser;
struct usb_serial_port *port = tty->driver_data;
switch (cmd) {
case TIOCGSERIAL:
memset(&ser, 0, sizeof ser);
ser.type = PORT_16654;
ser.line = port->minor;
ser.port = port->port_number;
ser.baud_base = 460800;
if (copy_to_user((void __user *)arg, &ser, sizeof ser))
return -EFAULT;
return 0;
default:
break;
}
return -ENOIOCTLCMD;
}
static void pl2303_set_break(struct usb_serial_port *port, bool enable)
{
struct usb_serial *serial = port->serial;
u16 state;
int result;
if (enable)
state = BREAK_ON;
else
state = BREAK_OFF;
dev_dbg(&port->dev, "%s - turning break %s\n", __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)
dev_err(&port->dev, "error sending break = %d\n", result);
}
static void pl2303_break_ctl(struct tty_struct *tty, int state)
{
struct usb_serial_port *port = tty->driver_data;
pl2303_set_break(port, state);
}
static void pl2303_update_line_status(struct usb_serial_port *port,
unsigned char *data,
unsigned int actual_length)
{
struct usb_serial *serial = port->serial;
struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
struct pl2303_private *priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
unsigned long flags;
unsigned int status_idx = UART_STATE_INDEX;
u8 status;
u8 delta;
if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
status_idx = 0;
if (actual_length < status_idx + 1)
return;
status = data[status_idx];
/* Save off the uart status for others to look at */
spin_lock_irqsave(&priv->lock, flags);
delta = priv->line_status ^ status;
priv->line_status = status;
spin_unlock_irqrestore(&priv->lock, flags);
if (status & UART_BREAK_ERROR)
usb_serial_handle_break(port);
if (delta & UART_STATE_MSR_MASK) {
if (delta & UART_CTS)
port->icount.cts++;
if (delta & UART_DSR)
port->icount.dsr++;
if (delta & UART_RING)
port->icount.rng++;
if (delta & UART_DCD) {
port->icount.dcd++;
tty = tty_port_tty_get(&port->port);
if (tty) {
usb_serial_handle_dcd_change(port, tty,
status & UART_DCD);
tty_kref_put(tty);
}
}
wake_up_interruptible(&port->port.delta_msr_wait);
}
}
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;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
__func__, status);
return;
default:
dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
__func__, status);
goto exit;
}
usb_serial_debug_data(&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(&port->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);
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);
if (!urb->actual_length)
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;
if (tty_flag != TTY_NORMAL)
dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
tty_flag);
/* overrun is special, not associated with a char */
if (line_status & UART_OVERRUN_ERROR)
tty_insert_flip_char(&port->port, 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(&port->port, data[i],
tty_flag);
} else {
tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
urb->actual_length);
}
tty_flip_buffer_push(&port->port);
}
static struct usb_serial_driver pl2303_device = {
.driver = {
.owner = THIS_MODULE,
.name = "pl2303",
},
.id_table = id_table,
.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,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.process_read_urb = pl2303_process_read_urb,
.read_int_callback = pl2303_read_int_callback,
.probe = pl2303_probe,
.attach = pl2303_startup,
.release = pl2303_release,
.port_probe = pl2303_port_probe,
.port_remove = pl2303_port_remove,
};
static struct usb_serial_driver * const serial_drivers[] = {
&pl2303_device, NULL
};
module_usb_serial_driver(serial_drivers, id_table);
MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
MODULE_LICENSE("GPL");
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