Beispiel #1
0
/* Test if the peripheral is IEEE 1284 compliant.
 * return values are:
 *   0 - handshake failed; peripheral is not compliant (or none present)
 *   1 - handshake OK; IEEE1284 peripheral present but no data available
 *   2 - handshake OK; IEEE1284 peripheral and data available
 */
int parport_ieee1284_nibble_mode_ok(struct parport *port, unsigned char mode) 
{
	/* make sure it's a valid state, set nStrobe & nAutoFeed high */
	parport_write_control(port, (parport_read_control(port) \
		& ~1 ) & ~2);
	udelay(1);
	parport_write_data(port, mode);
	udelay(1);
	/* nSelectIn high, nAutoFd low */
	parport_write_control(port, (parport_read_control(port) & ~8) | 2);
	if (parport_wait_peripheral(port, 0x78, 0x38)) {
		parport_write_control(port, 
				      (parport_read_control(port) & ~2) | 8);
		return 0; 
	}
	/* nStrobe low */
	parport_write_control(port, parport_read_control(port) | 1);
	udelay(1);				     /* Strobe wait */
	/* nStrobe high, nAutoFeed low, last step before transferring 
	 *  reverse data */
	parport_write_control(port, (parport_read_control(port) \
		& ~1) & ~2);
	udelay(1);
	/* Data available? */
	return (parport_wait_peripheral(port, 0x20, 0))?1:2;
}
static void bit_lp_setscl(void *data, int state)
{
	/*be cautious about state of the control register -
		touch only the one bit needed*/
	if (state) {
		parport_write_control((struct parport *) data,
		      parport_read_control((struct parport *) data)|I2C_SCL);
	} else {
		parport_write_control((struct parport *) data,
		      parport_read_control((struct parport *) data)&I2C_CMASK);
	}
}
static unsigned int in(int offset)
{
	switch (offset) {
	case LIRC_LP_BASE:
		return parport_read_data(pport);
	case LIRC_LP_STATUS:
		return parport_read_status(pport);
	case LIRC_LP_CONTROL:
		return parport_read_control(pport);
	}
	return 0; /* make compiler happy */
}
Beispiel #4
0
static unsigned char port_read_control(struct parport *p)
{
	return parport_read_control(p);
}