2 * Copyright (c) 1998 Nicolas Souchu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/module.h>
35 #include <sys/mutex.h>
38 #include <dev/iicbus/iiconf.h>
39 #include <dev/iicbus/iicbus.h>
40 #include "iicbus_if.h"
46 iicbus_intr(device_t bus, int event, char *buf)
48 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
50 /* call owner's intr routine */
52 IICBUS_INTR(sc->owner, event, buf);
58 iicbus_poll(struct iicbus_softc *sc, int how)
62 IICBUS_ASSERT_LOCKED(sc);
64 case IIC_WAIT | IIC_INTR:
65 error = mtx_sleep(sc, &sc->lock, IICPRI|PCATCH, "iicreq", 0);
68 case IIC_WAIT | IIC_NOINTR:
69 error = mtx_sleep(sc, &sc->lock, IICPRI, "iicreq", 0);
81 * iicbus_request_bus()
83 * Allocate the device to perform transfers.
85 * how : IIC_WAIT or IIC_DONTWAIT
88 iicbus_request_bus(device_t bus, device_t dev, int how)
90 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
93 /* first, ask the underlying layers if the request is ok */
96 error = IICBUS_CALLBACK(device_get_parent(bus),
97 IIC_REQUEST_BUS, (caddr_t)&how);
99 error = iicbus_poll(sc, how);
100 } while (error == EWOULDBLOCK);
103 if (sc->owner && sc->owner != dev) {
105 error = iicbus_poll(sc, how);
113 /* free any allocated resource */
115 IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS,
124 * iicbus_release_bus()
126 * Release the device allocated with iicbus_request_dev()
129 iicbus_release_bus(device_t bus, device_t dev)
131 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
134 /* first, ask the underlying layers if the release is ok */
135 error = IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS, NULL);
142 if (sc->owner != dev) {
149 /* wakeup waiting processes */
159 * Test if the iicbus is started by the controller
162 iicbus_started(device_t bus)
164 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
166 return (sc->started);
172 * Send start condition to the slave addressed by 'slave'
175 iicbus_start(device_t bus, u_char slave, int timeout)
177 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
181 return (EINVAL); /* bus already started */
183 if (!(error = IICBUS_START(device_get_parent(bus), slave, timeout)))
192 * iicbus_repeated_start()
194 * Send start condition to the slave addressed by 'slave'
197 iicbus_repeated_start(device_t bus, u_char slave, int timeout)
199 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
203 return (EINVAL); /* bus should have been already started */
205 if (!(error = IICBUS_REPEATED_START(device_get_parent(bus), slave, timeout)))
216 * Send stop condition to the bus
219 iicbus_stop(device_t bus)
221 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
225 return (EINVAL); /* bus not started */
227 error = IICBUS_STOP(device_get_parent(bus));
229 /* refuse any further access */
238 * Write a block of data to the slave previously started by
239 * iicbus_start() call
242 iicbus_write(device_t bus, const char *buf, int len, int *sent, int timeout)
244 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
246 /* a slave must have been started for writing */
247 if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) != 0))
250 return (IICBUS_WRITE(device_get_parent(bus), buf, len, sent, timeout));
256 * Read a block of data from the slave previously started by
260 iicbus_read(device_t bus, char *buf, int len, int *read, int last, int delay)
262 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
264 /* a slave must have been started for reading */
265 if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) == 0))
268 return (IICBUS_READ(device_get_parent(bus), buf, len, read, last, delay));
272 * iicbus_write_byte()
274 * Write a byte to the slave previously started by iicbus_start() call
277 iicbus_write_byte(device_t bus, char byte, int timeout)
282 return (iicbus_write(bus, &data, 1, &sent, timeout));
288 * Read a byte from the slave previously started by iicbus_start() call
291 iicbus_read_byte(device_t bus, char *byte, int timeout)
295 return (iicbus_read(bus, byte, 1, &read, IIC_LAST_READ, timeout));
299 * iicbus_block_write()
301 * Write a block of data to slave ; start/stop protocol managed
304 iicbus_block_write(device_t bus, u_char slave, char *buf, int len, int *sent)
306 u_char addr = slave & ~LSB;
309 if ((error = iicbus_start(bus, addr, 0)))
312 error = iicbus_write(bus, buf, len, sent, 0);
320 * iicbus_block_read()
322 * Read a block of data from slave ; start/stop protocol managed
325 iicbus_block_read(device_t bus, u_char slave, char *buf, int len, int *read)
327 u_char addr = slave | LSB;
330 if ((error = iicbus_start(bus, addr, 0)))
333 error = iicbus_read(bus, buf, len, read, IIC_LAST_READ, 0);
343 * Do an aribtrary number of transfers on the iicbus. We pass these
344 * raw requests to the bridge driver. If the bridge driver supports
345 * them directly, then it manages all the details. If not, it can use
346 * the helper function iicbus_transfer_gen() which will do the
347 * transfers at a low level.
349 * Pointers passed in as part of iic_msg must be kernel pointers.
350 * Callers that have user addresses to manage must do so on their own.
353 iicbus_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs)
355 return (IICBUS_TRANSFER(device_get_parent(bus), msgs, nmsgs));
359 * Generic version of iicbus_transfer that calls the appropriate
360 * routines to accomplish this. See note above about acceptable
364 iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
366 int i, error, lenread, lenwrote, nkid, rpstart, addr;
367 device_t *children, bus;
370 if ((error = device_get_children(dev, &children, &nkid)) != 0)
373 free(children, M_TEMP);
378 free(children, M_TEMP);
379 nostop = iicbus_get_nostop(dev);
380 for (i = 0, error = 0; i < nmsgs && error == 0; i++) {
381 addr = msgs[i].slave;
382 if (msgs[i].flags & IIC_M_RD)
387 if (!(msgs[i].flags & IIC_M_NOSTART)) {
389 error = iicbus_repeated_start(bus, addr, 0);
391 error = iicbus_start(bus, addr, 0);
397 if (msgs[i].flags & IIC_M_RD)
398 error = iicbus_read(bus, msgs[i].buf, msgs[i].len,
399 &lenread, IIC_LAST_READ, 0);
401 error = iicbus_write(bus, msgs[i].buf, msgs[i].len,
404 if ((msgs[i].flags & IIC_M_NOSTOP) != 0 ||
405 (nostop && i + 1 < nmsgs)) {
406 rpstart = 1; /* Next message gets repeated start */