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harmonize backingstroe name with other drivers; don't force connection type

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drivers to define nop-like functions for features they don't support
This commit is contained in:
marschap
2007-11-04 13:25:54 +00:00
parent c76af798c3
commit e6c4b71ff0
8 changed files with 48 additions and 77 deletions
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server/drivers/hd44780.c
+21 -14
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@@ -376,31 +376,38 @@ HD44780_init(Driver *drvthis)
p->hd44780_functions->set_contrast = NULL;
p->hd44780_functions->set_brightness = NULL;
p->hd44780_functions->readkeypad = NULL;
p->hd44780_functions->scankeypad = HD44780_scankeypad;
p->hd44780_functions->scankeypad = NULL;
p->hd44780_functions->output = NULL;
p->hd44780_functions->close = NULL;
// Do connection type specific display init
// Do local (=connection type specific) display init
if (init_fn(drvthis) != 0)
return -1;
// consistency check: local keypad functions missing => no keypad
if ((p->hd44780_functions->readkeypad == NULL) &&
(p->hd44780_functions->scankeypad == HD44780_scankeypad)) {
p->hd44780_functions->scankeypad = NULL;
p->have_keypad = 0;
}
// consistency check: no local output function => no output
if (p->hd44780_functions->output == NULL)
p->have_output = 0;
// fail if local senddata function was not defined
// consistency check: fail if local senddata function was not defined
if (p->hd44780_functions->senddata == NULL) {
report(RPT_ERR, "%s: incomplete functions for connection type");
return -1;
}
// set scankeypad function if local readkeypad function is defined
if ((p->hd44780_functions->readkeypad != NULL) &&
(p->hd44780_functions->scankeypad == NULL)) {
p->hd44780_functions->scankeypad = HD44780_scankeypad;
}
// consistency check: no local keypad function => no keypad
if (p->hd44780_functions->scankeypad == NULL)
p->have_keypad = 0;
// consistency check: no local backlight function => no backlight
if (p->hd44780_functions->backlight == NULL)
p->have_backlight = 0;
// consistency check: no local output function => no output
if (p->hd44780_functions->output == NULL)
p->have_output = 0;
// Display startup parameters on the LCD
HD44780_clear(drvthis);