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linux/drivers/usb/serial/cp210x.c
Preston Fick a5360a53a7 usb: cp210x: Update to support CP2105 and multiple interface devices 
This patch updates the cp210x driver to support CP210x multiple
interface devices devices from Silicon Labs. The existing driver
always sends control requests to interface 0, which is hardcoded in
the usb_control_msg function calls. This only allows for single
interface devices to be used, and causes a bug when using ports on an
interface other than 0 in the multiple interface devices.

Here are the changes included in this patch:
- Updated the device list to contain the Silicon Labs factory default
  VID/PID for multiple interface CP210x devices
- Created a cp210x_port_private struct created for each port on
  startup, this struct holds the interface number
- Added a cp210x_release function to clean up the cp210x_port_private
  memory created on startup
- Modified usb_get_config and usb_set_config to get a pointer to the
  cp210x_port_private struct, and use the interface number there in the
  usb_control_message wIndex param

Signed-off-by: Preston Fick <preston.fick@silabs.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-03-02 16:19:16 -08:00

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/*
* Silicon Laboratories CP210x USB to RS232 serial adaptor driver
*
* Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
*
* 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.
*
* Support to set flow control line levels using TIOCMGET and TIOCMSET
* thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
* control thanks to Munir Nassar nassarmu@real-time.com
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/usb.h>
#include <linux/uaccess.h>
#include <linux/usb/serial.h>
/*
* Version Information
*/
#define DRIVER_VERSION "v0.09"
#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
/*
* Function Prototypes
*/
static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
static void cp210x_close(struct usb_serial_port *);
static void cp210x_get_termios(struct tty_struct *,
struct usb_serial_port *port);
static void cp210x_get_termios_port(struct usb_serial_port *port,
unsigned int *cflagp, unsigned int *baudp);
static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
struct ktermios *);
static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
struct ktermios*);
static int cp210x_tiocmget(struct tty_struct *);
static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
static int cp210x_tiocmset_port(struct usb_serial_port *port,
unsigned int, unsigned int);
static void cp210x_break_ctl(struct tty_struct *, int);
static int cp210x_startup(struct usb_serial *);
static void cp210x_release(struct usb_serial *);
static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
static bool debug;
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
{ USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
{ USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
{ USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
{ USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
{ USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
{ USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
{ USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
{ USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
{ USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
{ USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
{ USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
{ USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
{ USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
{ USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
{ USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
{ USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
{ USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
{ USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
{ USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
{ USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
{ USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
{ USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
{ USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
{ USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
{ USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
{ USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
{ USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
{ USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
{ USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
{ USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
{ USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
{ USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
{ USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
{ USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
{ USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
{ USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
{ USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
{ USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
{ USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
{ USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
{ USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
{ USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
{ USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
{ USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
{ USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
{ USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
{ USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
{ USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
{ USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
{ USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
{ USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
{ USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
{ USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
{ USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
{ USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
{ USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
{ USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
{ USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
{ USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
{ USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
{ USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
{ USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
{ USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
{ USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
{ USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
{ USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
{ USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
{ USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */
{ USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
{ USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
{ USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
{ USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
{ USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
{ USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
{ USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
{ USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
{ USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
{ USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
{ USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
{ USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
{ USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
{ USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
{ USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
{ USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
{ USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
{ USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
{ USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
{ USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
{ USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
{ USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
{ USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
{ } /* Terminating Entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
struct cp210x_port_private {
__u8 bInterfaceNumber;
};
static struct usb_driver cp210x_driver = {
.name = "cp210x",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
};
static struct usb_serial_driver cp210x_device = {
.driver = {
.owner = THIS_MODULE,
.name = "cp210x",
},
.id_table = id_table,
.num_ports = 1,
.bulk_in_size = 256,
.bulk_out_size = 256,
.open = cp210x_open,
.close = cp210x_close,
.break_ctl = cp210x_break_ctl,
.set_termios = cp210x_set_termios,
.tiocmget = cp210x_tiocmget,
.tiocmset = cp210x_tiocmset,
.attach = cp210x_startup,
.release = cp210x_release,
.dtr_rts = cp210x_dtr_rts
};
static struct usb_serial_driver * const serial_drivers[] = {
&cp210x_device, NULL
};
/* Config request types */
#define REQTYPE_HOST_TO_DEVICE 0x41
#define REQTYPE_DEVICE_TO_HOST 0xc1
/* Config request codes */
#define CP210X_IFC_ENABLE 0x00
#define CP210X_SET_BAUDDIV 0x01
#define CP210X_GET_BAUDDIV 0x02
#define CP210X_SET_LINE_CTL 0x03
#define CP210X_GET_LINE_CTL 0x04
#define CP210X_SET_BREAK 0x05
#define CP210X_IMM_CHAR 0x06
#define CP210X_SET_MHS 0x07
#define CP210X_GET_MDMSTS 0x08
#define CP210X_SET_XON 0x09
#define CP210X_SET_XOFF 0x0A
#define CP210X_SET_EVENTMASK 0x0B
#define CP210X_GET_EVENTMASK 0x0C
#define CP210X_SET_CHAR 0x0D
#define CP210X_GET_CHARS 0x0E
#define CP210X_GET_PROPS 0x0F
#define CP210X_GET_COMM_STATUS 0x10
#define CP210X_RESET 0x11
#define CP210X_PURGE 0x12
#define CP210X_SET_FLOW 0x13
#define CP210X_GET_FLOW 0x14
#define CP210X_EMBED_EVENTS 0x15
#define CP210X_GET_EVENTSTATE 0x16
#define CP210X_SET_CHARS 0x19
#define CP210X_GET_BAUDRATE 0x1D
#define CP210X_SET_BAUDRATE 0x1E
/* CP210X_IFC_ENABLE */
#define UART_ENABLE 0x0001
#define UART_DISABLE 0x0000
/* CP210X_(SET|GET)_BAUDDIV */
#define BAUD_RATE_GEN_FREQ 0x384000
/* CP210X_(SET|GET)_LINE_CTL */
#define BITS_DATA_MASK 0X0f00
#define BITS_DATA_5 0X0500
#define BITS_DATA_6 0X0600
#define BITS_DATA_7 0X0700
#define BITS_DATA_8 0X0800
#define BITS_DATA_9 0X0900
#define BITS_PARITY_MASK 0x00f0
#define BITS_PARITY_NONE 0x0000
#define BITS_PARITY_ODD 0x0010
#define BITS_PARITY_EVEN 0x0020
#define BITS_PARITY_MARK 0x0030
#define BITS_PARITY_SPACE 0x0040
#define BITS_STOP_MASK 0x000f
#define BITS_STOP_1 0x0000
#define BITS_STOP_1_5 0x0001
#define BITS_STOP_2 0x0002
/* CP210X_SET_BREAK */
#define BREAK_ON 0x0001
#define BREAK_OFF 0x0000
/* CP210X_(SET_MHS|GET_MDMSTS) */
#define CONTROL_DTR 0x0001
#define CONTROL_RTS 0x0002
#define CONTROL_CTS 0x0010
#define CONTROL_DSR 0x0020
#define CONTROL_RING 0x0040
#define CONTROL_DCD 0x0080
#define CONTROL_WRITE_DTR 0x0100
#define CONTROL_WRITE_RTS 0x0200
/*
* cp210x_get_config
* Reads from the CP210x configuration registers
* 'size' is specified in bytes.
* 'data' is a pointer to a pre-allocated array of integers large
* enough to hold 'size' bytes (with 4 bytes to each integer)
*/
static int cp210x_get_config(struct usb_serial_port *port, u8 request,
unsigned int *data, int size)
{
struct usb_serial *serial = port->serial;
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
__le32 *buf;
int result, i, length;
/* Number of integers required to contain the array */
length = (((size - 1) | 3) + 1)/4;
buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
if (!buf) {
dev_err(&port->dev, "%s - out of memory.\n", __func__);
return -ENOMEM;
}
/* Issue the request, attempting to read 'size' bytes */
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
request, REQTYPE_DEVICE_TO_HOST, 0x0000,
port_priv->bInterfaceNumber, buf, size, 300);
/* Convert data into an array of integers */
for (i = 0; i < length; i++)
data[i] = le32_to_cpu(buf[i]);
kfree(buf);
if (result != size) {
dbg("%s - Unable to send config request, "
"request=0x%x size=%d result=%d",
__func__, request, size, result);
if (result > 0)
result = -EPROTO;
return result;
}
return 0;
}
/*
* cp210x_set_config
* Writes to the CP210x configuration registers
* Values less than 16 bits wide are sent directly
* 'size' is specified in bytes.
*/
static int cp210x_set_config(struct usb_serial_port *port, u8 request,
unsigned int *data, int size)
{
struct usb_serial *serial = port->serial;
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
__le32 *buf;
int result, i, length;
/* Number of integers required to contain the array */
length = (((size - 1) | 3) + 1)/4;
buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
if (!buf) {
dev_err(&port->dev, "%s - out of memory.\n",
__func__);
return -ENOMEM;
}
/* Array of integers into bytes */
for (i = 0; i < length; i++)
buf[i] = cpu_to_le32(data[i]);
if (size > 2) {
result = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
request, REQTYPE_HOST_TO_DEVICE, 0x0000,
port_priv->bInterfaceNumber, buf, size, 300);
} else {
result = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
request, REQTYPE_HOST_TO_DEVICE, data[0],
port_priv->bInterfaceNumber, NULL, 0, 300);
}
kfree(buf);
if ((size > 2 && result != size) || result < 0) {
dbg("%s - Unable to send request, "
"request=0x%x size=%d result=%d",
__func__, request, size, result);
if (result > 0)
result = -EPROTO;
return result;
}
return 0;
}
/*
* cp210x_set_config_single
* Convenience function for calling cp210x_set_config on single data values
* without requiring an integer pointer
*/
static inline int cp210x_set_config_single(struct usb_serial_port *port,
u8 request, unsigned int data)
{
return cp210x_set_config(port, request, &data, 2);
}
/*
* cp210x_quantise_baudrate
* Quantises the baud rate as per AN205 Table 1
*/
static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
if (baud <= 300)
baud = 300;
else if (baud <= 600) baud = 600;
else if (baud <= 1200) baud = 1200;
else if (baud <= 1800) baud = 1800;
else if (baud <= 2400) baud = 2400;
else if (baud <= 4000) baud = 4000;
else if (baud <= 4803) baud = 4800;
else if (baud <= 7207) baud = 7200;
else if (baud <= 9612) baud = 9600;
else if (baud <= 14428) baud = 14400;
else if (baud <= 16062) baud = 16000;
else if (baud <= 19250) baud = 19200;
else if (baud <= 28912) baud = 28800;
else if (baud <= 38601) baud = 38400;
else if (baud <= 51558) baud = 51200;
else if (baud <= 56280) baud = 56000;
else if (baud <= 58053) baud = 57600;
else if (baud <= 64111) baud = 64000;
else if (baud <= 77608) baud = 76800;
else if (baud <= 117028) baud = 115200;
else if (baud <= 129347) baud = 128000;
else if (baud <= 156868) baud = 153600;
else if (baud <= 237832) baud = 230400;
else if (baud <= 254234) baud = 250000;
else if (baud <= 273066) baud = 256000;
else if (baud <= 491520) baud = 460800;
else if (baud <= 567138) baud = 500000;
else if (baud <= 670254) baud = 576000;
else if (baud < 1000000)
baud = 921600;
else if (baud > 2000000)
baud = 2000000;
return baud;
}
static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
{
int result;
dbg("%s - port %d", __func__, port->number);
result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
UART_ENABLE);
if (result) {
dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
return result;
}
/* Configure the termios structure */
cp210x_get_termios(tty, port);
/* The baud rate must be initialised on cp2104 */
if (tty)
cp210x_change_speed(tty, port, NULL);
return usb_serial_generic_open(tty, port);
}
static void cp210x_close(struct usb_serial_port *port)
{
dbg("%s - port %d", __func__, port->number);
usb_serial_generic_close(port);
mutex_lock(&port->serial->disc_mutex);
if (!port->serial->disconnected)
cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
mutex_unlock(&port->serial->disc_mutex);
}
/*
* cp210x_get_termios
* Reads the baud rate, data bits, parity, stop bits and flow control mode
* from the device, corrects any unsupported values, and configures the
* termios structure to reflect the state of the device
*/
static void cp210x_get_termios(struct tty_struct *tty,
struct usb_serial_port *port)
{
unsigned int baud;
if (tty) {
cp210x_get_termios_port(tty->driver_data,
&tty->termios->c_cflag, &baud);
tty_encode_baud_rate(tty, baud, baud);
}
else {
unsigned int cflag;
cflag = 0;
cp210x_get_termios_port(port, &cflag, &baud);
}
}
/*
* cp210x_get_termios_port
* This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
*/
static void cp210x_get_termios_port(struct usb_serial_port *port,
unsigned int *cflagp, unsigned int *baudp)
{
unsigned int cflag, modem_ctl[4];
unsigned int baud;
unsigned int bits;
dbg("%s - port %d", __func__, port->number);
cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
dbg("%s - baud rate = %d", __func__, baud);
*baudp = baud;
cflag = *cflagp;
cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
cflag &= ~CSIZE;
switch (bits & BITS_DATA_MASK) {
case BITS_DATA_5:
dbg("%s - data bits = 5", __func__);
cflag |= CS5;
break;
case BITS_DATA_6:
dbg("%s - data bits = 6", __func__);
cflag |= CS6;
break;
case BITS_DATA_7:
dbg("%s - data bits = 7", __func__);
cflag |= CS7;
break;
case BITS_DATA_8:
dbg("%s - data bits = 8", __func__);
cflag |= CS8;
break;
case BITS_DATA_9:
dbg("%s - data bits = 9 (not supported, using 8 data bits)",
__func__);
cflag |= CS8;
bits &= ~BITS_DATA_MASK;
bits |= BITS_DATA_8;
cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
break;
default:
dbg("%s - Unknown number of data bits, using 8", __func__);
cflag |= CS8;
bits &= ~BITS_DATA_MASK;
bits |= BITS_DATA_8;
cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
break;
}
switch (bits & BITS_PARITY_MASK) {
case BITS_PARITY_NONE:
dbg("%s - parity = NONE", __func__);
cflag &= ~PARENB;
break;
case BITS_PARITY_ODD:
dbg("%s - parity = ODD", __func__);
cflag |= (PARENB|PARODD);
break;
case BITS_PARITY_EVEN:
dbg("%s - parity = EVEN", __func__);
cflag &= ~PARODD;
cflag |= PARENB;
break;
case BITS_PARITY_MARK:
dbg("%s - parity = MARK", __func__);
cflag |= (PARENB|PARODD|CMSPAR);
break;
case BITS_PARITY_SPACE:
dbg("%s - parity = SPACE", __func__);
cflag &= ~PARODD;
cflag |= (PARENB|CMSPAR);
break;
default:
dbg("%s - Unknown parity mode, disabling parity", __func__);
cflag &= ~PARENB;
bits &= ~BITS_PARITY_MASK;
cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
break;
}
cflag &= ~CSTOPB;
switch (bits & BITS_STOP_MASK) {
case BITS_STOP_1:
dbg("%s - stop bits = 1", __func__);
break;
case BITS_STOP_1_5:
dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
__func__);
bits &= ~BITS_STOP_MASK;
cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
break;
case BITS_STOP_2:
dbg("%s - stop bits = 2", __func__);
cflag |= CSTOPB;
break;
default:
dbg("%s - Unknown number of stop bits, using 1 stop bit",
__func__);
bits &= ~BITS_STOP_MASK;
cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
break;
}
cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
if (modem_ctl[0] & 0x0008) {
dbg("%s - flow control = CRTSCTS", __func__);
cflag |= CRTSCTS;
} else {
dbg("%s - flow control = NONE", __func__);
cflag &= ~CRTSCTS;
}
*cflagp = cflag;
}
/*
* CP2101 supports the following baud rates:
*
* 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
* 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
*
* CP2102 and CP2103 support the following additional rates:
*
* 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
* 576000
*
* The device will map a requested rate to a supported one, but the result
* of requests for rates greater than 1053257 is undefined (see AN205).
*
* CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
* respectively, with an error less than 1%. The actual rates are determined
* by
*
* div = round(freq / (2 x prescale x request))
* actual = freq / (2 x prescale x div)
*
* For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
* or 1 otherwise.
* For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
* otherwise.
*/
static void cp210x_change_speed(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
u32 baud;
baud = tty->termios->c_ospeed;
/* This maps the requested rate to a rate valid on cp2102 or cp2103,
* or to an arbitrary rate in [1M,2M].
*
* NOTE: B0 is not implemented.
*/
baud = cp210x_quantise_baudrate(baud);
dbg("%s - setting baud rate to %u", __func__, baud);
if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
sizeof(baud))) {
dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
if (old_termios)
baud = old_termios->c_ospeed;
else
baud = 9600;
}
tty_encode_baud_rate(tty, baud, baud);
}
static void cp210x_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
unsigned int cflag, old_cflag;
unsigned int bits;
unsigned int modem_ctl[4];
dbg("%s - port %d", __func__, port->number);
if (!tty)
return;
cflag = tty->termios->c_cflag;
old_cflag = old_termios->c_cflag;
if (tty->termios->c_ospeed != old_termios->c_ospeed)
cp210x_change_speed(tty, port, old_termios);
/* If the number of data bits is to be updated */
if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
bits &= ~BITS_DATA_MASK;
switch (cflag & CSIZE) {
case CS5:
bits |= BITS_DATA_5;
dbg("%s - data bits = 5", __func__);
break;
case CS6:
bits |= BITS_DATA_6;
dbg("%s - data bits = 6", __func__);
break;
case CS7:
bits |= BITS_DATA_7;
dbg("%s - data bits = 7", __func__);
break;
case CS8:
bits |= BITS_DATA_8;
dbg("%s - data bits = 8", __func__);
break;
/*case CS9:
bits |= BITS_DATA_9;
dbg("%s - data bits = 9", __func__);
break;*/
default:
dbg("cp210x driver does not "
"support the number of bits requested,"
" using 8 bit mode");
bits |= BITS_DATA_8;
break;
}
if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
dbg("Number of data bits requested "
"not supported by device");
}
if ((cflag & (PARENB|PARODD|CMSPAR)) !=
(old_cflag & (PARENB|PARODD|CMSPAR))) {
cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
bits &= ~BITS_PARITY_MASK;
if (cflag & PARENB) {
if (cflag & CMSPAR) {
if (cflag & PARODD) {
bits |= BITS_PARITY_MARK;
dbg("%s - parity = MARK", __func__);
} else {
bits |= BITS_PARITY_SPACE;
dbg("%s - parity = SPACE", __func__);
}
} else {
if (cflag & PARODD) {
bits |= BITS_PARITY_ODD;
dbg("%s - parity = ODD", __func__);
} else {
bits |= BITS_PARITY_EVEN;
dbg("%s - parity = EVEN", __func__);
}
}
}
if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
dbg("Parity mode not supported by device");
}
if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
bits &= ~BITS_STOP_MASK;
if (cflag & CSTOPB) {
bits |= BITS_STOP_2;
dbg("%s - stop bits = 2", __func__);
} else {
bits |= BITS_STOP_1;
dbg("%s - stop bits = 1", __func__);
}
if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
dbg("Number of stop bits requested "
"not supported by device");
}
if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
__func__, modem_ctl[0], modem_ctl[1],
modem_ctl[2], modem_ctl[3]);
if (cflag & CRTSCTS) {
modem_ctl[0] &= ~0x7B;
modem_ctl[0] |= 0x09;
modem_ctl[1] = 0x80;
dbg("%s - flow control = CRTSCTS", __func__);
} else {
modem_ctl[0] &= ~0x7B;
modem_ctl[0] |= 0x01;
modem_ctl[1] |= 0x40;
dbg("%s - flow control = NONE", __func__);
}
dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
__func__, modem_ctl[0], modem_ctl[1],
modem_ctl[2], modem_ctl[3]);
cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
}
}
static int cp210x_tiocmset (struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
return cp210x_tiocmset_port(port, set, clear);
}
static int cp210x_tiocmset_port(struct usb_serial_port *port,
unsigned int set, unsigned int clear)
{
unsigned int control = 0;
dbg("%s - port %d", __func__, port->number);
if (set & TIOCM_RTS) {
control |= CONTROL_RTS;
control |= CONTROL_WRITE_RTS;
}
if (set & TIOCM_DTR) {
control |= CONTROL_DTR;
control |= CONTROL_WRITE_DTR;
}
if (clear & TIOCM_RTS) {
control &= ~CONTROL_RTS;
control |= CONTROL_WRITE_RTS;
}
if (clear & TIOCM_DTR) {
control &= ~CONTROL_DTR;
control |= CONTROL_WRITE_DTR;
}
dbg("%s - control = 0x%.4x", __func__, control);
return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
}
static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
{
if (on)
cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
else
cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
}
static int cp210x_tiocmget (struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
unsigned int control;
int result;
dbg("%s - port %d", __func__, port->number);
cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
|((control & CONTROL_RTS) ? TIOCM_RTS : 0)
|((control & CONTROL_CTS) ? TIOCM_CTS : 0)
|((control & CONTROL_DSR) ? TIOCM_DSR : 0)
|((control & CONTROL_RING)? TIOCM_RI : 0)
|((control & CONTROL_DCD) ? TIOCM_CD : 0);
dbg("%s - control = 0x%.2x", __func__, control);
return result;
}
static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
unsigned int state;
dbg("%s - port %d", __func__, port->number);
if (break_state == 0)
state = BREAK_OFF;
else
state = BREAK_ON;
dbg("%s - turning break %s", __func__,
state == BREAK_OFF ? "off" : "on");
cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
}
static int cp210x_startup(struct usb_serial *serial)
{
struct cp210x_port_private *port_priv;
int i;
/* cp210x buffers behave strangely unless device is reset */
usb_reset_device(serial->dev);
for (i = 0; i < serial->num_ports; i++) {
port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
if (!port_priv)
return -ENOMEM;
memset(port_priv, 0x00, sizeof(*port_priv));
port_priv->bInterfaceNumber =
serial->interface->cur_altsetting->desc.bInterfaceNumber;
usb_set_serial_port_data(serial->port[i], port_priv);
}
return 0;
}
static void cp210x_release(struct usb_serial *serial)
{
struct cp210x_port_private *port_priv;
int i;
for (i = 0; i < serial->num_ports; i++) {
port_priv = usb_get_serial_port_data(serial->port[i]);
kfree(port_priv);
usb_set_serial_port_data(serial->port[i], NULL);
}
}
module_usb_serial_driver(cp210x_driver, serial_drivers);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
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