1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
52 static int pcf_noack(struct pcf_softc *pcf, int timeout);
62 	int counter = TIMEOUT;  in pcf_wait_byte()
65 	while (counter--) {  in pcf_wait_byte()
71 	printf("pcf: timeout!\n");  in pcf_wait_byte()
91 	if (sc->pcf_started) {  in pcf_stop_locked()
95 		sc->pcf_started = 0;  in pcf_stop_locked()
100 pcf_noack(struct pcf_softc *sc, int timeout)  in pcf_noack()  argument
103 	int k = timeout/10;  in pcf_noack()
110 		DELAY(10);				/* XXX wait 10 us */  in pcf_noack()
111 	} while (k--);  in pcf_noack()
117 pcf_repeated_start(device_t dev, u_char slave, int timeout)  in pcf_repeated_start()  argument
131 	 * according to transfer direction */  in pcf_repeated_start()
139 	if (pcf_noack(sc, timeout)) {  in pcf_repeated_start()
157 pcf_start(device_t dev, u_char slave, int timeout)  in pcf_start()  argument
175 	 * according to transfer direction */  in pcf_start()
181 	sc->pcf_started = 1;  in pcf_start()
188 	if (pcf_noack(sc, timeout)) {  in pcf_start()
242 		iicbus_intr(sc->iicbus, INTR_ERROR, &error);  in pcf_intr()
250 		switch(sc->pcf_slave_mode) {  in pcf_intr()
257 				sc->pcf_slave_mode = SLAVE_RECEIVER;  in pcf_intr()
259 				iicbus_intr(sc->iicbus, INTR_NOACK, NULL);  in pcf_intr()
264 			iicbus_intr(sc->iicbus, INTR_TRANSMIT, &data);  in pcf_intr()
274 					iicbus_intr(sc->iicbus, INTR_GENERAL, &addr);  in pcf_intr()
276 					iicbus_intr(sc->iicbus, INTR_START, &addr);  in pcf_intr()
279 					sc->pcf_slave_mode = SLAVE_TRANSMITTER;  in pcf_intr()
282 					iicbus_intr(sc->iicbus, INTR_TRANSMIT, &data);  in pcf_intr()
297 				iicbus_intr(sc->iicbus, INTR_STOP, NULL);  in pcf_intr()
304 				iicbus_intr(sc->iicbus, INTR_RECEIVE, &data);  in pcf_intr()
310 				sc->pcf_slave_mode);  in pcf_intr()
322 	sc->pcf_slave_mode = SLAVE_RECEIVER;  in pcf_intr()
335 		*oldaddr = sc->pcf_addr;  in pcf_rst_card()
339 		sc->pcf_addr = PCF_DEFAULT_ADDR;  in pcf_rst_card()
341 		sc->pcf_addr = addr;  in pcf_rst_card()
346 	pcf_set_S0(sc, sc->pcf_addr >> 1);  in pcf_rst_card()
371 	sc->pcf_slave_mode = SLAVE_RECEIVER;  in pcf_rst_card()
378 pcf_write(device_t dev, const char *buf, int len, int *sent, int timeout /* us */)  in pcf_write()  argument
398 		if (pcf_noack(sc, timeout)) {  in pcf_write()
403 		len --;  in pcf_write()
420 	 int delay /* us */)  in pcf_read()
451 			/* ok, last data byte already in S0, no I2C activity  in pcf_read()
462 		len --;  in pcf_read()