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Attempt to autodetect non-connected pins

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This commit is contained in:
Mike Robinson 2014-10-04 18:03:00 +01:00
parent 44df93dfd1
commit 531ad20ddd
1 changed files with 64 additions and 27 deletions
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91
input/parport_joypad.c
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@ -68,6 +68,8 @@ static void poll_pad(struct parport_joypad *pad)
* back again so the same pullup scheme may be used for
* all pins.
*
* Pin 1 is set high so it can be used for pullups.
*
* RetroArch does not perform debouncing, and so long as
* the button settling time is less than the frame time
* no bouncing will be observed. This replicates the latching
@ -85,15 +87,13 @@ static void poll_pad(struct parport_joypad *pad)
for (i = 0; i < 8; i++)
{
pad->buttons[i] = !(data & UINT8_C(1 << i));
pad->buttons[i] = !(data & UINT8_C(1 << i)) && pad->button_enable[i];
}
for (i = 3; i < 8; i++)
{
pad->buttons[i + 5] = !(status & UINT8_C(1 << i));
pad->buttons[i + 5] = !(status & UINT8_C(1 << i)) && pad->button_enable[i];
}
pad->buttons[12] = pad->buttons[12] ? false : true;
pad->buttons[12] = pad->buttons[12] ? false : true && pad->button_enable[12];
}
static bool parport_joypad_init_pad(const char *path, struct parport_joypad *pad)
@ -102,6 +102,7 @@ static bool parport_joypad_init_pad(const char *path, struct parport_joypad *pad
char data;
struct ppdev_frob_struct frob;
bool set_control = false;
int i;
int mode = IEEE1284_MODE_BYTE;
@ -162,13 +163,17 @@ static bool parport_joypad_init_pad(const char *path, struct parport_joypad *pad
goto error;
}
/* Failure to enable strobe breaks Linux Multisystem style controllers.
/* Failure to enable strobe can break Linux Multisystem style controllers.
* Controllers using an alternative power source will still work.
* Failure to disable interrupts slightly increases CPU usage. */
if (!set_control)
RARCH_WARN("[Joypad]: Failed to clear nStrobe and nIRQ bits on %s\n", path);
strlcpy(pad->ident, path, sizeof(g_settings.input.device_names[0]));
for (i = 0; i < NUM_BUTTONS; i++)
pad->button_enable[i] = true;
return true;
error:
close(pad->fd);
@ -193,9 +198,28 @@ static void parport_joypad_poll(void)
}
}
static void destroy_pad(struct parport_joypad *pad)
{
char data;
data = pad->saved_data;
if (ioctl(pad->fd, PPWDATA, &data) < 0)
RARCH_ERR("[Joypad]: Failed to restore original data register on %s\n", pad->ident);
data = pad->saved_control;
if (ioctl(pad->fd, PPWDATA, &data) < 0)
RARCH_ERR("[Joypad]: Failed to restore original control register on %s\n", pad->ident);
if (ioctl(pad->fd, PPRELEASE) < 0)
RARCH_ERR("[Joypad]: Failed to release parallel port %s\n", pad->ident);
close(pad->fd);
pad->fd = -1;
}
static bool parport_joypad_init(void)
{
unsigned i;
unsigned i, j;
bool found_button;
for (i = 0; i < MAX_PLAYERS; i++)
{
@ -207,13 +231,38 @@ static bool parport_joypad_init(void)
snprintf(path, sizeof(path), "/dev/parport%u", i);
if (parport_joypad_init_pad(path, pad))
{
input_config_autoconfigure_joypad(i, pad->ident, 0, 0, "parport");
poll_pad(pad);
}
else
input_config_autoconfigure_joypad(i, NULL, 0, 0, NULL);
}
{
/* If a pin is low on initialization it can either mean
* a button is pressed or that nothing is connected.
* Polling non-connected pins can render the menu unusable
* so assume the user is not holding any button on startup
* and disable any low pins.
*/
for (j = 0; j < NUM_BUTTONS; j++)
pad->button_enable[j] = true;
poll_pad(pad);
found_button = false;
for (j = 0; j < NUM_BUTTONS; j++)
{
if (!pad->buttons[j])
found_button = true;
else
pad->button_enable[j] = false;
}
if (found_button)
input_config_autoconfigure_joypad(i, pad->ident, 0, 0, "parport");
else
{
destroy_pad(pad); /* assume nothing was connected */
input_config_autoconfigure_joypad(i, NULL, 0, 0, NULL);
}
}
else
input_config_autoconfigure_joypad(i, NULL, 0, 0, NULL);
}
return true;
}
@ -221,7 +270,6 @@ static bool parport_joypad_init(void)
static void parport_joypad_destroy(void)
{
unsigned i;
char data;
struct parport_joypad *pad;
for (i = 0; i < MAX_PLAYERS; i++)
@ -229,18 +277,7 @@ static void parport_joypad_destroy(void)
pad = &g_pads[i];
if (pad->fd >= 0)
{
data = pad->saved_data;
if (ioctl(pad->fd, PPWDATA, &data) < 0)
RARCH_ERR("[Joypad]: Failed to restore original data register on %s\n", pad->ident);
data = pad->saved_control;
if (ioctl(pad->fd, PPWDATA, &data) < 0)
RARCH_ERR("[Joypad]: Failed to restore original control register on %s\n", pad->ident);
if (ioctl(pad->fd, PPRELEASE) < 0)
RARCH_ERR("[Joypad]: Failed to release parallel port %s\n", pad->ident);
close(pad->fd);
destroy_pad(pad);
}
}
memset(g_pads, 0, sizeof(g_pads));