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cp210x_gpio
Commit 9f164683 authored by Oleg Dzhimiev's avatar Oleg Dzhimiev
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Makefile 0 → 100644
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obj-m = cp210x.o
KVERSION = $(shell uname -r)
all:
make -C /lib/modules/$(KVERSION)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(KVERSION)/build M=$(PWD) clean
README.md 0 → 100644
View file @ 9f164683
# CP210x GPIO control
A patch to the CP210x USB to UART Bridges driver that adds GPIO pins control by implementing ioctl function and a python script to program devices.
## Supported OS
* Kubuntu Linux 13.04 (kernel 3.8.0-32)
## Tested devices
* CP2103
* CP2104
## Install
1. Build:
./build_driver
2. Reload driver (from the built directory):
sudo rmmod 210x
sudo insmod 210x.ko
## Program GPIO_MAS
1. Examples:
* Set all 1's:
./cp210x_gpio.py -d /dev/ttyUSB0 -m 0xff 0xff
* Set GPIO[3]=1, others - 0:
./cp210x_gpio.py -d /dev/ttyUSB1 -m 0xff 0x08
## Changes in the driver
* Changes in the driver cp210x.c are based on the patch found [here](https://lkml.org/lkml/2012/5/1/2)
* GPIO_VALUE=arg[23:16], GPIO_MASK=arg[7:0]
## Unresolved questions
* Silabs drivers in 2.6.x and 3.x.x for GPIOs differ:
* 2.6.x: GPIO_VALUE=arg[23:16], GPIO_MASK=arg[7:0] - this matches the patch
* 3.x.x: GPIO_VALUE=arg[15: 8], GPIO_MASK=arg[7:0]
## Links
* [Silabs CP210x USB to UART Bridge VCP Drivers](http://www.silabs.com/products/mcu/pages/usbtouartbridgevcpdrivers.aspx) - supported kernels 2.6.x, 3.x.x (but 3.x.x are not up-to-date - cannot be built in 3.8.0)
* [cp210x: Add ioctl for GPIO support](https://lkml.org/lkml/2012/5/1/2) - patch
\ No newline at end of file
build_driver.sh 0 → 100755
View file @ 9f164683
#!/bin/bash
CP210X_NAME="cp210x.c"
CP210X_ADDRESS="https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/plain/drivers/usb/serial/cp210x.c?id=refs/tags/v"
PATCH_NAME="cp210x.patch"
LINUX_KERNEL_VERSION=$(uname -r | cut -f1 -d"-")
LKV_P1=$(echo $LINUX_KERNEL_VERSION | cut -f1 -d".")
LKV_P2=$(echo $LINUX_KERNEL_VERSION | cut -f2 -d".")
LKV_P3=$(echo $LINUX_KERNEL_VERSION | cut -f3 -d".")
if [ $LKV_P3 = 0 ]; then
CP210X_VERSION=$(echo "$LKV_P1.$LKV_P2")
else
CP210X_VERSION=$(echo "$LKV_P1.$LKV_P2.$LKV_P3")
fi
#uncomment if patch doesn't work
#CP210X_VERSION="3.8.0"
#get the file to patch
if [ ! -f $CP210X_NAME ]; then
wget -O $CP210X_NAME "${CP210X_ADDRESS}${CP210X_VERSION}"
fi
#patch
patch -r - -Np1 < $PATCH_NAME
#run make
make clean
make
cp210x.c 0 → 100644
View file @ 9f164683
/*
* 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>
#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 int cp210x_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg);
static void cp210x_get_termios(struct tty_struct *, struct usb_serial_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 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(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
{ 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, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
{ 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, 0x815F) }, /* Timewave HamLinkUSB */
{ 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, 0x85F8) }, /* Virtenio Preon32 */
{ 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, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
{ USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
{ USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
{ USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
{ USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
{ USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
{ USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
{ 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(0x1E29, 0x0102) }, /* Festo CPX-USB */
{ USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
{ USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
{ USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
{ USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
{ USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
{ } /* Terminating Entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
struct cp210x_serial_private {
__u8 bInterfaceNumber;
};
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,
.ioctl = cp210x_ioctl,
.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
};
/* IOCTLs */
#define IOCTL_GPIOGET 0x8000
#define IOCTL_GPIOSET 0x8001
/* Config request types */
#define REQTYPE_HOST_TO_INTERFACE 0x41
#define REQTYPE_INTERFACE_TO_HOST 0xc1
#define REQTYPE_HOST_TO_DEVICE 0x40
#define REQTYPE_DEVICE_TO_HOST 0xc0
/* 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
#define CP210X_VENDOR_SPECIFIC 0xFF
/* CP210X_IFC_ENABLE */
#define UART_ENABLE 0x0001
#define UART_DISABLE 0x0000
/* CP210X_VENDOR_SPECIFIC */
#define CP210X_WRITE_LATCH 0x37E1
#define CP210X_READ_LATCH 0x00C2
/* 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_serial_private *spriv = usb_get_serial_data(serial);
__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_INTERFACE_TO_HOST, 0x0000,
spriv->bInterfaceNumber, buf, size,
USB_CTRL_GET_TIMEOUT);
/* 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) {
dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
__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_serial_private *spriv = usb_get_serial_data(serial);
__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_INTERFACE, 0x0000,
spriv->bInterfaceNumber, buf, size,
USB_CTRL_SET_TIMEOUT);
} else {
result = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
request, REQTYPE_HOST_TO_INTERFACE, data[0],
spriv->bInterfaceNumber, NULL, 0,
USB_CTRL_SET_TIMEOUT);
}
kfree(buf);
if ((size > 2 && result != size) || result < 0) {
dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
__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;
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)
{
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);
}
static int cp210x_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
int result = 0;
struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
unsigned int latch_setting = 0;
switch (cmd) {
case IOCTL_GPIOGET:
result = usb_control_msg(
serial->dev,
usb_rcvctrlpipe(serial->dev, 0),
CP210X_VENDOR_SPECIFIC,
REQTYPE_DEVICE_TO_HOST,
CP210X_READ_LATCH,
spriv->bInterfaceNumber,
&latch_setting, 1,
USB_CTRL_GET_TIMEOUT);
if (result != 1)
return -EPROTO;
*(unsigned long *)arg = (unsigned long)latch_setting;
return 0;
break;
case IOCTL_GPIOSET:
latch_setting = *(unsigned int *)arg & 0x000000FF;
//why [23:16] bits are taken for value is unknown
latch_setting |= (*(unsigned int *)arg & 0x00FF0000) >> 8;
result = usb_control_msg(
serial->dev,
usb_sndctrlpipe(serial->dev, 0),
CP210X_VENDOR_SPECIFIC,
REQTYPE_HOST_TO_DEVICE,
CP210X_WRITE_LATCH,
latch_setting,
NULL, 0,
USB_CTRL_SET_TIMEOUT);
if (result != 0)
return -EPROTO;
return 0;
break;
default:
break;
}
return -ENOIOCTLCMD;
}
/*
* 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)
{
struct device *dev = &port->dev;
unsigned int cflag, modem_ctl[4];
unsigned int baud;
unsigned int bits;
cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
dev_dbg(dev, "%s - baud rate = %d\n", __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:
dev_dbg(dev, "%s - data bits = 5\n", __func__);
cflag |= CS5;
break;
case BITS_DATA_6:
dev_dbg(dev, "%s - data bits = 6\n", __func__);
cflag |= CS6;
break;
case BITS_DATA_7:
dev_dbg(dev, "%s - data bits = 7\n", __func__);
cflag |= CS7;
break;
case BITS_DATA_8:
dev_dbg(dev, "%s - data bits = 8\n", __func__);
cflag |= CS8;
break;
case BITS_DATA_9:
dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
cflag |= CS8;
bits &= ~BITS_DATA_MASK;
bits |= BITS_DATA_8;
cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
break;
default:
dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __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:
dev_dbg(dev, "%s - parity = NONE\n", __func__);
cflag &= ~PARENB;
break;
case BITS_PARITY_ODD:
dev_dbg(dev, "%s - parity = ODD\n", __func__);
cflag |= (PARENB|PARODD);
break;
case BITS_PARITY_EVEN:
dev_dbg(dev, "%s - parity = EVEN\n", __func__);
cflag &= ~PARODD;
cflag |= PARENB;
break;
case BITS_PARITY_MARK:
dev_dbg(dev, "%s - parity = MARK\n", __func__);
cflag |= (PARENB|PARODD|CMSPAR);
break;
case BITS_PARITY_SPACE:
dev_dbg(dev, "%s - parity = SPACE\n", __func__);
cflag &= ~PARODD;
cflag |= (PARENB|CMSPAR);
break;
default:
dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __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:
dev_dbg(dev, "%s - stop bits = 1\n", __func__);
break;
case BITS_STOP_1_5:
dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
bits &= ~BITS_STOP_MASK;
cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
break;
case BITS_STOP_2:
dev_dbg(dev, "%s - stop bits = 2\n", __func__);
cflag |= CSTOPB;
break;
default:
dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __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) {
dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
cflag |= CRTSCTS;
} else {
dev_dbg(dev, "%s - flow control = NONE\n", __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);
dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __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)
{
struct device *dev = &port->dev;
unsigned int cflag, old_cflag;
unsigned int bits;
unsigned int modem_ctl[4];
dev_dbg(dev, "%s - port %d\n", __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;
dev_dbg(dev, "%s - data bits = 5\n", __func__);
break;
case CS6:
bits |= BITS_DATA_6;
dev_dbg(dev, "%s - data bits = 6\n", __func__);
break;
case CS7:
bits |= BITS_DATA_7;
dev_dbg(dev, "%s - data bits = 7\n", __func__);
break;
case CS8:
bits |= BITS_DATA_8;
dev_dbg(dev, "%s - data bits = 8\n", __func__);
break;
/*case CS9:
bits |= BITS_DATA_9;
dev_dbg(dev, "%s - data bits = 9\n", __func__);
break;*/
default:
dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
bits |= BITS_DATA_8;
break;
}
if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
dev_dbg(dev, "Number of data bits requested not supported by device\n");
}
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;
dev_dbg(dev, "%s - parity = MARK\n", __func__);
} else {
bits |= BITS_PARITY_SPACE;
dev_dbg(dev, "%s - parity = SPACE\n", __func__);
}
} else {
if (cflag & PARODD) {
bits |= BITS_PARITY_ODD;
dev_dbg(dev, "%s - parity = ODD\n", __func__);
} else {
bits |= BITS_PARITY_EVEN;
dev_dbg(dev, "%s - parity = EVEN\n", __func__);
}
}
}
if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
dev_dbg(dev, "Parity mode not supported by device\n");
}
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;
dev_dbg(dev, "%s - stop bits = 2\n", __func__);
} else {
bits |= BITS_STOP_1;
dev_dbg(dev, "%s - stop bits = 1\n", __func__);
}
if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
dev_dbg(dev, "Number of stop bits requested not supported by device\n");
}
if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
__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;
dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
} else {
modem_ctl[0] &= ~0x7B;
modem_ctl[0] |= 0x01;
modem_ctl[1] |= 0x40;
dev_dbg(dev, "%s - flow control = NONE\n", __func__);
}
dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
__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;
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;
}
dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __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;
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);
dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __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;
if (break_state == 0)
state = BREAK_OFF;
else
state = BREAK_ON;
dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
state == BREAK_OFF ? "off" : "on");
cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
}
static int cp210x_startup(struct usb_serial *serial)
{
struct usb_host_interface *cur_altsetting;
struct cp210x_serial_private *spriv;
/* cp210x buffers behave strangely unless device is reset */
usb_reset_device(serial->dev);
spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
if (!spriv)
return -ENOMEM;
cur_altsetting = serial->interface->cur_altsetting;
spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
usb_set_serial_data(serial, spriv);
return 0;
}
static void cp210x_release(struct usb_serial *serial)
{
struct cp210x_serial_private *spriv;
spriv = usb_get_serial_data(serial);
kfree(spriv);
}
module_usb_serial_driver(serial_drivers, id_table);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
cp210x.patch 0 → 100644
View file @ 9f164683
--- a/cp210x.c 2013-10-30 18:43:43.000000000 -0600
+++ b/cp210x.c 2013-10-30 19:23:02.410147064 -0600
@@ -31,6 +31,8 @@
*/
static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
static void cp210x_close(struct usb_serial_port *);
+static int cp210x_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg);
static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
static void cp210x_get_termios_port(struct usb_serial_port *port,
unsigned int *cflagp, unsigned int *baudp);
@@ -174,6 +176,7 @@
.bulk_out_size = 256,
.open = cp210x_open,
.close = cp210x_close,
+ .ioctl = cp210x_ioctl,
.break_ctl = cp210x_break_ctl,
.set_termios = cp210x_set_termios,
.tiocmget = cp210x_tiocmget,
@@ -187,6 +190,10 @@
&cp210x_device, NULL
};
+/* IOCTLs */
+#define IOCTL_GPIOGET 0x8000
+#define IOCTL_GPIOSET 0x8001
+
/* Config request types */
#define REQTYPE_HOST_TO_INTERFACE 0x41
#define REQTYPE_INTERFACE_TO_HOST 0xc1
@@ -220,11 +227,16 @@
#define CP210X_SET_CHARS 0x19
#define CP210X_GET_BAUDRATE 0x1D
#define CP210X_SET_BAUDRATE 0x1E
+#define CP210X_VENDOR_SPECIFIC 0xFF
/* CP210X_IFC_ENABLE */
#define UART_ENABLE 0x0001
#define UART_DISABLE 0x0000
+/* CP210X_VENDOR_SPECIFIC */
+#define CP210X_WRITE_LATCH 0x37E1
+#define CP210X_READ_LATCH 0x00C2
+
/* CP210X_(SET|GET)_BAUDDIV */
#define BAUD_RATE_GEN_FREQ 0x384000
@@ -449,6 +461,54 @@
mutex_unlock(&port->serial->disc_mutex);
}
+static int cp210x_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct usb_serial *serial = port->serial;
+ int result = 0;
+ struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
+ unsigned int latch_setting = 0;
+
+ switch (cmd) {
+ case IOCTL_GPIOGET:
+ result = usb_control_msg(
+ serial->dev,
+ usb_rcvctrlpipe(serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_DEVICE_TO_HOST,
+ CP210X_READ_LATCH,
+ spriv->bInterfaceNumber,
+ &latch_setting, 1,
+ USB_CTRL_GET_TIMEOUT);
+ if (result != 1)
+ return -EPROTO;
+ *(unsigned long *)arg = (unsigned long)latch_setting;
+ return 0;
+ break;
+ case IOCTL_GPIOSET:
+ latch_setting = *(unsigned int *)arg & 0x000000FF;
+ //why [23:16] bits are taken for value is unknown
+ latch_setting |= (*(unsigned int *)arg & 0x00FF0000) >> 8;
+
+ result = usb_control_msg(
+ serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_HOST_TO_DEVICE,
+ CP210X_WRITE_LATCH,
+ latch_setting,
+ NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ if (result != 0)
+ return -EPROTO;
+ return 0;
+ break;
+ default:
+ break;
+ }
+ return -ENOIOCTLCMD;
+}
+
/*
* cp210x_get_termios
* Reads the baud rate, data bits, parity, stop bits and flow control mode
cp210x_gpio.py 0 → 100755
View file @ 9f164683
#!/usr/bin/python
#-----------------------------------------------------------------------------
# FILE NAME : cp210x_gpio.py
# DESCRIPTION: control GPIO pins for CP210X USB to UART Bridges
# Copyright (C) 2013 Elphel, Inc
#-----------------------------------------------------------------------------
# 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 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# The four essential freedoms with GNU GPL software are:
# * to run the program for any purpose
# * to study how the program works and change it to make it do what you wish
# * to redistribute copies so you can help your neighbor
# * to distribute copies of your modified versions to others
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#-----------------------------------------------------------------------------
__author__ = "Oleg Dzhimiev"
__copyright__ = "Copyright 2013, Elphel, Inc."
__license__ = "GPL"
__version__ = "3.0+"
__maintainer__ = "Oleg Dzhimiev"
__email__ = "oleg@elphel.com"
__status__ = "Released"
import array, fcntl
import argparse # http://docs.python.org/2/howto/argparse.html
IOCTL_GPIOGET = 0x8000
IOCTL_GPIOSET = 0x8001
parser = argparse.ArgumentParser()
parser.add_argument('-d', '--device', default="/dev/ttyUSB0", help='USB device. Default: /dev/ttyUSB0')
parser.add_argument("gpio_value", help="hex value for GPIO. Example (GPIO[3:0]): 0xf - all 1's, 0x0 - all 0's")
parser.add_argument('-m', '--mask', default="0xff",help='hex value for masking out GPIO bits: 1 - enable rewrite, 0 - disable. Example (GPIO[3:0]): -m 0xf')
args = parser.parse_args()
device=args.device
mask = int(args.mask,0)
gpio = (int(args.gpio_value,0)<<16)|mask
print ('Target GPIO value:'),gpio
try:
fd = open(device, 'r+')
except:
raise Exception(str(device)+' is not present')
buf = array.array('l', [0])
fcntl.ioctl(fd, IOCTL_GPIOGET, buf, 1)
print ('Old GPIO value:'),hex(buf[0])
buf[0] = gpio
fcntl.ioctl(fd, IOCTL_GPIOSET, buf, 1)
fcntl.ioctl(fd, IOCTL_GPIOGET, buf, 1)
print ('New GPIO value:'),hex(buf[0])
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