wacom.c File Reference

#include <glib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <string.h>
#include "log.h"
#include "system.h"
#include "wacom.h"

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Data Structures
struct	command
Defines
#define	NUM_COMMANDS   8
#define	DEV_WACOM   "/dev/ttymxc1"
Functions
static gboolean	send_command (char *name)
static gint	port_open (char *name)
static void	set_defaults (void)
void	wacom_scan_high ()
	Set Wacom tablet scanning to high accuracy, increasing power usage.
void	wacom_scan_normal ()
	Normal Wacom tablet scanning, descreasing accuracy and preserving power.
void	wacom_suspend ()
	Suspend Wacom tablet, wakes up when pen detected.
void	wacom_resume ()
	Enable Wacom tablet, return to normal scanning.
void	wacom_tilt_correction_enable (gboolean tilt_enable)
	Enable/Disable Hardware Tilt Correction algorithm.
void	wacom_enable ()
	Enable Wacom tablet.
void	wacom_disable ()
	Disable Wacom tablet. No scanning at all.
void	wacom_reset ()
	Reset Wacom tablet by toggling hardware reset line.
gboolean	wacom_is_enabled ()
	Query if Wacom tablet is enabled.
Variables
static command	commands []
static gboolean	g_wacom_enabled = FALSE

---

Define Documentation

#define DEV_WACOM   "/dev/ttymxc1"

Definition at line 61 of file wacom.c.

Referenced by send_command().

#define NUM_COMMANDS   8

Definition at line 60 of file wacom.c.

Referenced by send_command().

---

Function Documentation

static gint port_open

(

char *

name

)

[static]

Definition at line 254 of file wacom.c.

References ERRORPRINTF, fd, and LOGPRINTF.

{
    LOGPRINTF("entry");
    
    g_return_val_if_fail(name != NULL, FALSE);
    
    gint fd;
    struct termios t;
    
    if ((fd = open(name, O_RDWR | O_NOCTTY)) < 0)
    {
        ERRORPRINTF("Can't open device %s\n", name);
        return FALSE;
    }

    tcgetattr(fd, &t);

    t.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
    t.c_oflag &= ~OPOST;
    t.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
    t.c_cflag &= ~(CSIZE|PARENB);
    t.c_cflag |= CS8|CLOCAL;
    t.c_cflag &= ~(CSTOPB);     // 1 stop bit 
    t.c_cflag &= ~(CSIZE);      // 8 data bits 
    t.c_cflag |= CS8;
    t.c_cflag &= ~(PARENB);     // no parity 
    t.c_iflag |= IXOFF;         // flow control XOff 
    t.c_cc[VMIN] = 0;           // vmin value 
    t.c_cc[VTIME] = 10;         // vtime value 

    cfsetispeed(&t, B19200);
    cfsetospeed(&t, B19200);
    tcflush(fd, TCIFLUSH);
    tcsetattr(fd, TCSANOW, &t);
    
    return fd;
}

static gboolean send_command

(

char *

name

)

[static]

Definition at line 217 of file wacom.c.

References DEV_WACOM, ERRORPRINTF, fd, LOGPRINTF, NUM_COMMANDS, and port_open().

Referenced by wacom_scan_high(), wacom_scan_normal(), and wacom_tilt_correction_enable().

{
    LOGPRINTF("entry");

    g_return_val_if_fail(name != NULL, FALSE);

    gboolean retval = FALSE;
    gint fd = 0;
    gint num = 0;

    fd = port_open(DEV_WACOM);
    if (fd > 0)
    {
        gint i;
        for (i=0; i<NUM_COMMANDS; i++)
        {
            if (strcmp(name, commands[i].uname)==0)
            {
                LOGPRINTF("sending command %s, %s", commands[i].uname, commands[i].help);

                num = write(fd,commands[i].cmd, strlen(commands[i].cmd));
                LOGPRINTF("- bytes sent %d (%s)", num, commands[i].cmd);
                if (num < 0)
                {
                    ERRORPRINTF("- error sending: %d (%s)", errno, strerror(errno));
                }
                    
                retval = TRUE;
            }
        }
        close(fd);
    }
    
    return retval;
}

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static void set_defaults

(

void

)

[static]

Definition at line 210 of file wacom.c.

References wacom_scan_high(), and wacom_tilt_correction_enable().

Referenced by wacom_enable(), and wacom_reset().

{
    wacom_scan_high();
    wacom_tilt_correction_enable(FALSE);
}

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void wacom_disable

(

void

)

Disable Wacom tablet. No scanning at all.

---------------------------------------------------------------------------

Name : wacom_disable

Parameters:

--

Returns:

--

--------------------------------------------------------------------------

Definition at line 181 of file wacom.c.

References g_wacom_enabled, LOGPRINTF, and sys_set_power().

Referenced by cb_sys_set_stylus(), event_gconf_value_changed(), set_startup_defaults(), and start_demo_mode().

{
    LOGPRINTF("entry");
    
    sys_set_power("wacom", 0);
    g_wacom_enabled = FALSE;
}

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void wacom_enable

(

void

)

Enable Wacom tablet.

---------------------------------------------------------------------------

Name : wacom_enable

Parameters:

--

Returns:

--

--------------------------------------------------------------------------

Definition at line 171 of file wacom.c.

References g_wacom_enabled, LOGPRINTF, set_defaults(), and sys_set_power().

Referenced by cb_sys_set_stylus(), event_gconf_value_changed(), set_startup_defaults(), and stop_demo_mode().

{
    LOGPRINTF("entry");
    
    g_wacom_enabled = TRUE;
    sys_set_power("wacom", 1);
    set_defaults();
}

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gboolean wacom_is_enabled

(

void

)

Query if Wacom tablet is enabled.

---------------------------------------------------------------------------

Name : wacom_is_enabled

Parameters:

--

Returns:

TRUE when Wacom tablet is enabled, FALSE otherwise

--------------------------------------------------------------------------

Definition at line 200 of file wacom.c.

References g_wacom_enabled.

Referenced by cb_sys_get_stylus(), and do_idle().

{
    return g_wacom_enabled;
}

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void wacom_reset

(

)

Reset Wacom tablet by toggling hardware reset line.

---------------------------------------------------------------------------

Name : wacom_reset

Parameters:

--

Returns:

--

--------------------------------------------------------------------------

Definition at line 190 of file wacom.c.

References g_wacom_enabled, LOGPRINTF, set_defaults(), and sys_set_power().

Referenced by do_idle().

{
    LOGPRINTF("entry");
    
    g_wacom_enabled = TRUE;
    sys_set_power("wacom_reset", 1);
    set_defaults();
}

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void wacom_resume

(

void

)

Enable Wacom tablet, return to normal scanning.

---------------------------------------------------------------------------

Name : wacom_resume

Parameters:

--

Returns:

--

--------------------------------------------------------------------------

Definition at line 139 of file wacom.c.

References g_wacom_enabled, LOGPRINTF, and WARNPRINTF.

Referenced by cb_sys_set_stylus(), do_idle(), wacom_scan_high(), and wacom_scan_normal().

{
    LOGPRINTF("entry");
    if (g_wacom_enabled)
    {
        // since the wacom switches to writing mode (133pps) automatically, don't do anything
    }
    else
    {
        WARNPRINTF("wacom is disabled, mode not changed");
    }
}

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void wacom_scan_high

(

void

)

Set Wacom tablet scanning to high accuracy, increasing power usage.

File Name : wacom.h

Description: Wacom tables functions Copyright (C) 2008 iRex Technologies B.V. All rights reserved.---------------------------------------------------------------------------

Name : wacom_scan_high

Parameters:

--

Returns:

--

--------------------------------------------------------------------------

Definition at line 95 of file wacom.c.

References g_wacom_enabled, LOGPRINTF, send_command(), wacom_resume(), and WARNPRINTF.

Referenced by cb_sys_set_stylus(), and set_defaults().

{
    LOGPRINTF("entry");
    if (g_wacom_enabled)
    {
        wacom_resume();
        send_command("sample-133");
    }
    else
    {
        WARNPRINTF("wacom is disabled, mode not changed");
    }
}

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void wacom_scan_normal

(

void

)

Normal Wacom tablet scanning, descreasing accuracy and preserving power.

---------------------------------------------------------------------------

Name : wacom_scan_normal

Parameters:

--

Returns:

--

--------------------------------------------------------------------------

Definition at line 110 of file wacom.c.

References g_wacom_enabled, LOGPRINTF, send_command(), wacom_resume(), and WARNPRINTF.

Referenced by cb_sys_set_stylus().

{
    LOGPRINTF("entry");
    if (g_wacom_enabled)
    {
        wacom_resume();
        send_command("sample-80");
    }
    else
    {
        WARNPRINTF("wacom is disabled, mode not changed");
    }
}

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void wacom_suspend

(

void

)

Suspend Wacom tablet, wakes up when pen detected.

---------------------------------------------------------------------------

Name : wacom_suspend

Parameters:

--

Returns:

--

--------------------------------------------------------------------------

Definition at line 125 of file wacom.c.

References g_wacom_enabled, LOGPRINTF, and WARNPRINTF.

Referenced by cb_sys_set_stylus(), and do_idle().

{
    LOGPRINTF("entry");
    if (g_wacom_enabled)
    {
        // since the wacom switches to normal mode (8pps) automatically, don't do anything
    }
    else
    {
        WARNPRINTF("wacom is disabled, mode not changed");
    }
}

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void wacom_tilt_correction_enable

(

gboolean

tilt_enable

)

Enable/Disable Hardware Tilt Correction algorithm.

---------------------------------------------------------------------------

Name : wacom_tilt_correction_enable

Parameters:

tilt_enable

TRUE to enable correction, FALSE to disable it

Returns:

--

--------------------------------------------------------------------------

Definition at line 153 of file wacom.c.

References g_wacom_enabled, LOGPRINTF, send_command(), and WARNPRINTF.

Referenced by set_defaults().

{
    LOGPRINTF("entry");
    if (g_wacom_enabled && tilt_enable)
    {
        send_command("tiltcor-on");
    }
    else if (g_wacom_enabled && !tilt_enable)
    {
        send_command("tiltcor-off");
    }
    else
    {
        WARNPRINTF("wacom is disabled, tilt correction not changed");
    }
}

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---

Variable Documentation

command commands[] [static]

Initial value:

 {
    {"stop",        "0", "Stop sampling"},
    {"sample-133",  "1", "Start sampling at 133 pts/sec"},
    {"sample-80",   "2", "Start sampling at 80 pts/sec"},
    {"sample-40",   "3", "Start sampling at 40 pts/sec"},
    {"survey-on",   "+", "Enable survey scan"},
    {"survey-off",  "-", "Disable survey scan"},
    {"tiltcor-on",  "t", "Enable tilt correction"},
    {"tiltcor-off", "u", "Disable tilt correction"},
}

Definition at line 68 of file wacom.c.

gboolean g_wacom_enabled = FALSE [static]

Definition at line 79 of file wacom.c.

Referenced by wacom_disable(), wacom_enable(), wacom_is_enabled(), wacom_reset(), wacom_resume(), wacom_scan_high(), wacom_scan_normal(), wacom_suspend(), and wacom_tilt_correction_enable().