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linux_dsm_epyc7002/drivers/usb/serial/spcp8x5.c
Johan Hovold 5ed8d41023 USB: serial: spcp8x5: fix modem-status handling 
Make sure to detect short control transfers and return zero on success
when retrieving the modem status.

This fixes the TIOCMGET implementation which since e1ed212d85 ("USB:
spcp8x5: add proper modem-status support") has returned TIOCM_LE on
successful retrieval, and avoids leaking bits from the stack on short
transfers.

This also fixes the carrier-detect implementation which since the above
mentioned commit unconditionally has returned true.

Fixes: e1ed212d85 ("USB: spcp8x5: add proper modem-status support")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
2017-01-16 16:38:56 +01:00

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/*
* spcp8x5 USB to serial adaptor driver
*
* Copyright (C) 2010-2013 Johan Hovold (jhovold@gmail.com)
* 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/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>
#define DRIVER_DESC "SPCP8x5 USB to serial adaptor driver"
#define SPCP825_QUIRK_NO_UART_STATUS 0x01
#define SPCP825_QUIRK_NO_WORK_MODE 0x02
#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 const 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),
.driver_info = SPCP825_QUIRK_NO_UART_STATUS |
SPCP825_QUIRK_NO_WORK_MODE },
{ } /* 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;
};
/* 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 0x75
#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
struct spcp8x5_private {
unsigned quirks;
spinlock_t lock;
u8 line_control;
};
static int spcp8x5_probe(struct usb_serial *serial,
const struct usb_device_id *id)
{
usb_set_serial_data(serial, (void *)id);
return 0;
}
static int spcp8x5_attach(struct usb_serial *serial)
{
unsigned char num_ports = serial->num_ports;
if (serial->num_bulk_in < num_ports ||
serial->num_bulk_out < num_ports) {
dev_err(&serial->interface->dev, "missing endpoints\n");
return -ENODEV;
}
return 0;
}
static int spcp8x5_port_probe(struct usb_serial_port *port)
{
const struct usb_device_id *id = usb_get_serial_data(port->serial);
struct spcp8x5_private *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->lock);
priv->quirks = id->driver_info;
usb_set_serial_port_data(port, priv);
port->port.drain_delay = 256;
return 0;
}
static int spcp8x5_port_remove(struct usb_serial_port *port)
{
struct spcp8x5_private *priv;
priv = usb_get_serial_port_data(port);
kfree(priv);
return 0;
}
static int spcp8x5_set_ctrl_line(struct usb_serial_port *port, u8 mcr)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
struct usb_device *dev = port->serial->dev;
int retval;
if (priv->quirks & SPCP825_QUIRK_NO_UART_STATUS)
return -EPERM;
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_err(&port->dev, "failed to set control lines: %d\n",
retval);
}
return retval;
}
static int spcp8x5_get_msr(struct usb_serial_port *port, u8 *status)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
struct usb_device *dev = port->serial->dev;
u8 *buf;
int ret;
if (priv->quirks & SPCP825_QUIRK_NO_UART_STATUS)
return -EPERM;
buf = kzalloc(1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
GET_UART_STATUS, GET_UART_STATUS_TYPE,
0, GET_UART_STATUS_MSR, buf, 1, 100);
if (ret < 1) {
dev_err(&port->dev, "failed to get modem status: %d\n", ret);
if (ret >= 0)
ret = -EIO;
goto out;
}
dev_dbg(&port->dev, "0xc0:0x22:0:6 %d - 0x02%x\n", ret, *buf);
*status = *buf;
ret = 0;
out:
kfree(buf);
return ret;
}
static void spcp8x5_set_work_mode(struct usb_serial_port *port, u16 value,
u16 index)
{
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
struct usb_device *dev = port->serial->dev;
int ret;
if (priv->quirks & SPCP825_QUIRK_NO_WORK_MODE)
return;
ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
SET_WORKING_MODE_TYPE, SET_WORKING_MODE,
value, index, NULL, 0, 100);
dev_dbg(&port->dev, "value = %#x , index = %#x\n", value, index);
if (ret < 0)
dev_err(&port->dev, "failed to set work mode: %d\n", ret);
}
static int spcp8x5_carrier_raised(struct usb_serial_port *port)
{
u8 msr;
int ret;
ret = spcp8x5_get_msr(port, &msr);
if (ret || msr & 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_ctrl_line(port, control);
}
static void spcp8x5_init_termios(struct tty_struct *tty)
{
tty->termios = tty_std_termios;
tty->termios.c_cflag = B115200 | CS8 | CREAD | HUPCL | CLOCAL;
tty->termios.c_ispeed = 115200;
tty->termios.c_ospeed = 115200;
}
static void spcp8x5_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct usb_serial *serial = port->serial;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int cflag = tty->termios.c_cflag;
unsigned short uartdata;
unsigned char buf[2] = {0, 0};
int baud;
int i;
u8 control;
/* check that they really want us to change something */
if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
return;
/* set DTR/RTS active */
spin_lock_irqsave(&priv->lock, flags);
control = priv->line_control;
if (old_termios && (old_termios->c_cflag & CBAUD) == B0) {
priv->line_control |= MCR_DTR;
if (!(old_termios->c_cflag & CRTSCTS))
priv->line_control |= MCR_RTS;
}
if (control != priv->line_control) {
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
spcp8x5_set_ctrl_line(port, control);
} else {
spin_unlock_irqrestore(&priv->lock, flags);
}
/* Set Baud Rate */
baud = tty_get_baud_rate(tty);
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:
dev_err(&port->dev, "unsupported baudrate, using 9600\n");
}
/* Set Data Length : 00:5bit, 01:6bit, 10:7bit, 11:8bit */
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)
dev_err(&port->dev, "Set UART format %#x failed (error = %d)\n",
uartdata, i);
dev_dbg(&port->dev, "0x21:0x40:0:0 %d\n", i);
if (cflag & CRTSCTS) {
/* enable hardware flow control */
spcp8x5_set_work_mode(port, 0x000a, SET_WORKING_MODE_U2C);
}
}
static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
int ret;
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_ctrl_line(port, priv->line_control);
if (tty)
spcp8x5_set_termios(tty, port, NULL);
return usb_serial_generic_open(tty, port);
}
static int spcp8x5_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
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_ctrl_line(port, control);
}
static int spcp8x5_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int mcr;
u8 status;
unsigned int result;
result = spcp8x5_get_msr(port, &status);
if (result)
return result;
spin_lock_irqsave(&priv->lock, flags);
mcr = priv->line_control;
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;
}
static struct usb_serial_driver spcp8x5_device = {
.driver = {
.owner = THIS_MODULE,
.name = "SPCP8x5",
},
.id_table = id_table,
.num_ports = 1,
.open = spcp8x5_open,
.dtr_rts = spcp8x5_dtr_rts,
.carrier_raised = spcp8x5_carrier_raised,
.set_termios = spcp8x5_set_termios,
.init_termios = spcp8x5_init_termios,
.tiocmget = spcp8x5_tiocmget,
.tiocmset = spcp8x5_tiocmset,
.probe = spcp8x5_probe,
.attach = spcp8x5_attach,
.port_probe = spcp8x5_port_probe,
.port_remove = spcp8x5_port_remove,
};
static struct usb_serial_driver * const serial_drivers[] = {
&spcp8x5_device, NULL
};
module_usb_serial_driver(serial_drivers, id_table);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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