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TX inhibit GPIO support #10

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dd2d740
Config changes for TXINH
ab0tj Nov 12, 2015
0d7003b
Init for TXINH
ab0tj Nov 12, 2015
401db2d
Add TXINH check to hdlc_data_detect_any
ab0tj Nov 12, 2015
b81262f
TXINH testing fixes
ab0tj Nov 12, 2015
42a2398
Disable obnoxious white background on arm targets
ab0tj Nov 12, 2015
c15c3ee
Tested TXINH, fixed it
ab0tj Nov 13, 2015
9b36294
TXINH logic was reversed
ab0tj Nov 13, 2015
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Init for TXINH
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@ab0tj
ab0tj committed Nov 12, 2015
commit 0d7003bb98f753516a2ca0f56eca4b39cd84f572
190 changes: 103 additions & 87 deletions ptt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -155,6 +155,102 @@ static HANDLE ptt_fd[MAX_CHANS][NUM_OCTYPES];

static char otnames[NUM_OCTYPES][8];

void export_gpio(int gpio, int invert, int direction)
{
HANDLE fd;
char stemp[80];
struct stat finfo;
int err;

fd = open("/sys/class/gpio/export", O_WRONLY);
if (fd < 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Permissions do not allow ordinary users to access GPIO.\n");
dw_printf ("Log in as root and type this command:\n");
dw_printf (" chmod go+w /sys/class/gpio/export /sys/class/gpio/unexport\n");
exit (1);
}
sprintf (stemp, "%d", gpio);
if (write (fd, stemp, strlen(stemp)) != strlen(stemp)) {
int e = errno;
/* Ignore EBUSY error which seems to mean */
/* the device node already exists. */
if (e != EBUSY) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing \"%s\" to /sys/class/gpio/export, errno=%d\n", stemp, e);
dw_printf ("%s\n", strerror(e));
exit (1);
}
}
close (fd);

/*
* We will have the same permission problem if not root.
* We only care about "direction" and "value".
*/
sprintf (stemp, "sudo chmod go+rw /sys/class/gpio/gpio%d/direction", gpio);
err = system (stemp);
sprintf (stemp, "sudo chmod go+rw /sys/class/gpio/gpio%d/value", gpio);
err = system (stemp);

sprintf (stemp, "/sys/class/gpio/gpio%d/value", gpio);

if (stat(stemp, &finfo) < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Failed to get status for %s \n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}

if (geteuid() != 0) {
if ( ! (finfo.st_mode & S_IWOTH)) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Permissions do not allow ordinary users to access GPIO.\n");
dw_printf ("Log in as root and type these commands:\n");
dw_printf (" chmod go+rw /sys/class/gpio/gpio%d/direction", gpio);
dw_printf (" chmod go+rw /sys/class/gpio/gpio%d/value", gpio);
exit (1);
}
}

/*
* Set direction and initial value.
*/

sprintf (stemp, "/sys/class/gpio/gpio%d/direction", gpio);
fd = open(stemp, O_WRONLY);
if (fd < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error opening %s\n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}

char gpio_val[8];
if (direction) {
if (invert) {
strcpy (gpio_val, "high");
}
else {
strcpy (gpio_val, "low");
}
}
else {
strcpy (gpio_val, "in");
}

if (write (fd, gpio_val, strlen(gpio_val)) != strlen(gpio_val)) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing direction to %s\n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}
close (fd);
}

void ptt_init (struct audio_s *audio_config_p)
{
int ch;
Expand Down Expand Up @@ -326,6 +422,7 @@ void ptt_init (struct audio_s *audio_config_p)
using_gpio = 1;
}
}
if (audio_config_p->achan[ch].txinh.enabled) using_gpio = 1;
}
}

Expand All @@ -343,7 +440,7 @@ void ptt_init (struct audio_s *audio_config_p)
if (stat("/sys/class/gpio/export", &finfo) < 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("This system is not configured with the GPIO user interface.\n");
dw_printf ("Use a different method for PTT control.\n");
dw_printf ("Use a different method for PTT, DCD, or TXINH control.\n");
exit (1);
}

Expand All @@ -367,7 +464,7 @@ void ptt_init (struct audio_s *audio_config_p)
/* Unexpected because we could do it before. */
text_color_set(DW_COLOR_ERROR);
dw_printf ("This system is not configured with the GPIO user interface.\n");
dw_printf ("Use a different method for PTT control.\n");
dw_printf ("Use a different method for PTT, DCD, or TXINH control.\n");
exit (1);
}

Expand All @@ -392,93 +489,12 @@ void ptt_init (struct audio_s *audio_config_p)
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_GPIO) {
char stemp[80];
struct stat finfo;
int err;

fd = open("/sys/class/gpio/export", O_WRONLY);
if (fd < 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Permissions do not allow ordinary users to access GPIO.\n");
dw_printf ("Log in as root and type this command:\n");
dw_printf (" chmod go+w /sys/class/gpio/export /sys/class/gpio/unexport\n");
exit (1);
}
sprintf (stemp, "%d", audio_config_p->achan[ch].octrl[ot].ptt_gpio);
if (write (fd, stemp, strlen(stemp)) != strlen(stemp)) {
int e = errno;
/* Ignore EBUSY error which seems to mean */
/* the device node already exists. */
if (e != EBUSY) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing \"%s\" to /sys/class/gpio/export, errno=%d\n", stemp, e);
dw_printf ("%s\n", strerror(e));
exit (1);
}
}
close (fd);

/*
* We will have the same permission problem if not root.
* We only care about "direction" and "value".
*/
sprintf (stemp, "sudo chmod go+rw /sys/class/gpio/gpio%d/direction", audio_config_p->achan[ch].octrl[ot].ptt_gpio);
err = system (stemp);
sprintf (stemp, "sudo chmod go+rw /sys/class/gpio/gpio%d/value", audio_config_p->achan[ch].octrl[ot].ptt_gpio);
err = system (stemp);

sprintf (stemp, "/sys/class/gpio/gpio%d/value", audio_config_p->achan[ch].octrl[ot].ptt_gpio);

if (stat(stemp, &finfo) < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Failed to get status for %s \n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}

if (geteuid() != 0) {
if ( ! (finfo.st_mode & S_IWOTH)) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Permissions do not allow ordinary users to access GPIO.\n");
dw_printf ("Log in as root and type these commands:\n");
dw_printf (" chmod go+rw /sys/class/gpio/gpio%d/direction", audio_config_p->achan[ch].octrl[ot].ptt_gpio);
dw_printf (" chmod go+rw /sys/class/gpio/gpio%d/value", audio_config_p->achan[ch].octrl[ot].ptt_gpio);
exit (1);
}
}

/*
* Set output direction with initial state off.
*/

sprintf (stemp, "/sys/class/gpio/gpio%d/direction", audio_config_p->achan[ch].octrl[ot].ptt_gpio);
fd = open(stemp, O_WRONLY);
if (fd < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error opening %s\n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}

char hilo[8];
if (audio_config_p->achan[ch].octrl[ot].ptt_invert) {
strcpy (hilo, "high");
}
else {
strcpy (hilo, "low");
}
if (write (fd, hilo, strlen(hilo)) != strlen(hilo)) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing initial state to %s\n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}
close (fd);
export_gpio(audio_config_p->achan[ch].octrl[ot].ptt_gpio, audio_config_p->achan[ch].octrl[ot].ptt_invert, 1);
}
}
if (audio_config_p->achan[ch].txinh.enabled) {
export_gpio(audio_config_p->achan[ch].txinh.gpio, audio_config_p->achan[ch].txinh.invert, 0);
}
}
}
#endif
Expand Down