1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
37 #include <dev/iicbus/iiconf.h>
38 #include <dev/iicbus/iicbus.h>
44  * system errno value later.  This lets controller- and bus-layer code get
54  * Translate IIC_Exxxxx status values to vaguely-equivelent errno values.
75 		 * IIC_ERRNO marker bit.  If lots of high-order bits are set,  in iic2errno()
76 		 * then it's one of the negative pseudo-errors such as ERESTART  in iic2errno()
77 		 * and we return it as-is.  Otherwise it's a plain "small  in iic2errno()
99 	if (sc->owner)  in iicbus_intr()
100 		IICBUS_INTR(sc->owner, event, buf);  in iicbus_intr()
113 		error = mtx_sleep(sc, &sc->lock, IICPRI|PCATCH, "iicreq", 0);  in iicbus_poll()
117 		error = mtx_sleep(sc, &sc->lock, IICPRI, "iicreq", 0);  in iicbus_poll()
135 iicbus_request_bus(device_t bus, device_t dev, int how)  in iicbus_request_bus()  argument
144 		if (sc->owner == NULL)  in iicbus_request_bus()
146 		if ((how & IIC_RECURSIVE) && sc->owner == dev)  in iicbus_request_bus()
153 		++sc->owncount;  in iicbus_request_bus()
154 		if (sc->owner == NULL) {  in iicbus_request_bus()
155 			sc->owner = dev;  in iicbus_request_bus()
163 			if (device_get_state(dev) < DS_ATTACHING)  in iicbus_request_bus()
164 				sc->busydev = bus;  in iicbus_request_bus()
166 				sc->busydev = dev;  in iicbus_request_bus()
167 			device_busy(sc->busydev);  in iicbus_request_bus()
176 			reqdata.dev = dev;  in iicbus_request_bus()
184 				sc->owner = NULL;  in iicbus_request_bus()
185 				sc->owncount = 0;  in iicbus_request_bus()
187 				device_unbusy(sc->busydev);  in iicbus_request_bus()
203 iicbus_release_bus(device_t bus, device_t dev)  in iicbus_release_bus()  argument
210 	if (sc->owner != dev) {  in iicbus_release_bus()
215 	if (--sc->owncount == 0) {  in iicbus_release_bus()
216 		/* Drop the lock while informing the low-level driver. */  in iicbus_release_bus()
218 		reqdata.dev = dev;  in iicbus_release_bus()
224 		sc->owner = NULL;  in iicbus_release_bus()
226 		device_unbusy(sc->busydev);  in iicbus_release_bus()
242 	return (sc->started);  in iicbus_started()
248  * Send start condition to the slave addressed by 'slave'
251 iicbus_start(device_t bus, u_char slave, int timeout)  in iicbus_start()  argument
256 	if (sc->started)  in iicbus_start()
259 	if (!(error = IICBUS_START(device_get_parent(bus), slave, timeout)))  in iicbus_start()
260 		sc->started = slave;  in iicbus_start()
262 		sc->started = 0;  in iicbus_start()
270  * Send start condition to the slave addressed by 'slave'
273 iicbus_repeated_start(device_t bus, u_char slave, int timeout)  in iicbus_repeated_start()  argument
278 	if (!sc->started)  in iicbus_repeated_start()
281 	if (!(error = IICBUS_REPEATED_START(device_get_parent(bus), slave, timeout)))  in iicbus_repeated_start()
282 		sc->started = slave;  in iicbus_repeated_start()
284 		sc->started = 0;  in iicbus_repeated_start()
300 	if (!sc->started)  in iicbus_stop()
306 	sc->started = 0;  in iicbus_stop()
314  * Write a block of data to the slave previously started by
322 	/* a slave must have been started for writing */  in iicbus_write()
323 	if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) != 0))  in iicbus_write()
332  * Read a block of data from the slave previously started by
340 	/* a slave must have been started for reading */  in iicbus_read()
341 	if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) == 0))  in iicbus_read()
350  * Write a byte to the slave previously started by iicbus_start() call
359 	/* a slave must have been started for writing */  in iicbus_write_byte()
360 	if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) != 0))  in iicbus_write_byte()
369  * Read a byte from the slave previously started by iicbus_start() call
377 	/* a slave must have been started for reading */  in iicbus_read_byte()
378 	if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) == 0))  in iicbus_read_byte()
387  * Write a block of data to slave ; start/stop protocol managed
390 iicbus_block_write(device_t bus, u_char slave, char *buf, int len, int *sent)  in iicbus_block_write()  argument
392 	u_char addr = slave & ~LSB;  in iicbus_block_write()
408  * Read a block of data from slave ; start/stop protocol managed
411 iicbus_block_read(device_t bus, u_char slave, char *buf, int len, int *read)  in iicbus_block_read()  argument
413 	u_char addr = slave | LSB;  in iicbus_block_read()
446 iicbus_transfer_excl(device_t dev, struct iic_msg *msgs, uint32_t nmsgs,  in iicbus_transfer_excl()  argument
452 	bus = device_get_parent(dev);  in iicbus_transfer_excl()
453 	error = iicbus_request_bus(bus, dev, how);  in iicbus_transfer_excl()
456 	iicbus_release_bus(bus, dev);  in iicbus_transfer_excl()
466 iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)  in iicbus_transfer_gen()  argument
472 	if ((error = device_get_children(dev, &children, &nkid)) != 0)  in iicbus_transfer_gen()
483 		addr = msgs[i].slave;  in iicbus_transfer_gen()
528 	 * Two transfers back to back with a repeat-start between them; first we  in iicdev_readfrom()
529 	 * write the address-within-device, then we read from the device.  in iicdev_readfrom()
533 	msgs[0].slave = slaveaddr;  in iicdev_readfrom()
538 	msgs[1].slave = slaveaddr;  in iicdev_readfrom()
581 	msg.slave = iicbus_get_addr(slavedev);  in iicdev_writeto()