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
26 * $FreeBSD: src/sys/dev/iicbus/iiconf.c,v 1.19 2008/08/23 07:38:00 imp Exp $
27 * $DragonFly: src/sys/bus/iicbus/iiconf.c,v 1.5 2005/06/02 20:40:36 dillon Exp $
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/malloc.h>
33 #include <sys/module.h>
35 #include <sys/thread2.h>
37 #include <bus/iicbus/iiconf.h>
38 #include <bus/iicbus/iicbus.h>
39 #include "iicbus_if.h"
45 iicbus_intr(device_t bus, int event, char *buf)
47 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
49 /* call owner's intr routine */
51 IICBUS_INTR(sc->owner, event, buf);
57 iicbus_poll(struct iicbus_softc *sc, int how)
62 case IIC_WAIT | IIC_INTR:
63 error = tsleep(sc, PCATCH, "iicreq", 0);
66 case IIC_WAIT | IIC_NOINTR:
67 error = tsleep(sc, 0, "iicreq", 0);
79 * iicbus_request_bus()
81 * Allocate the device to perform transfers.
83 * how : IIC_WAIT or IIC_DONTWAIT
86 iicbus_request_bus(device_t bus, device_t dev, int how)
88 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
91 /* first, ask the underlying layers if the request is ok */
93 error = IICBUS_CALLBACK(device_get_parent(bus),
94 IIC_REQUEST_BUS, (caddr_t)&how);
96 error = iicbus_poll(sc, how);
97 } while (error == EWOULDBLOCK);
101 if (sc->owner && sc->owner != dev) {
103 error = iicbus_poll(sc, how);
110 /* free any allocated resource */
112 IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS,
120 * iicbus_release_bus()
122 * Release the device allocated with iicbus_request_dev()
125 iicbus_release_bus(device_t bus, device_t dev)
127 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
130 /* first, ask the underlying layers if the release is ok */
131 error = IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS, NULL);
137 if (sc->owner != dev) {
144 /* wakeup waiting processes */
153 * Test if the iicbus is started by the controller
156 iicbus_started(device_t bus)
158 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
160 return (sc->started);
166 * Send start condition to the slave addressed by 'slave'
169 iicbus_start(device_t bus, u_char slave, int timeout)
171 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
175 return (EINVAL); /* bus already started */
177 if (!(error = IICBUS_START(device_get_parent(bus), slave, timeout)))
186 * iicbus_repeated_start()
188 * Send start condition to the slave addressed by 'slave'
191 iicbus_repeated_start(device_t bus, u_char slave, int timeout)
193 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
197 return (EINVAL); /* bus should have been already started */
199 if (!(error = IICBUS_REPEATED_START(device_get_parent(bus), slave, timeout)))
210 * Send stop condition to the bus
213 iicbus_stop(device_t bus)
215 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
219 return (EINVAL); /* bus not started */
221 error = IICBUS_STOP(device_get_parent(bus));
223 /* refuse any further access */
232 * Write a block of data to the slave previously started by
233 * iicbus_start() call
236 iicbus_write(device_t bus, const char *buf, int len, int *sent, int timeout)
238 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
240 /* a slave must have been started with the appropriate address */
241 if (!sc->started || (sc->started & LSB))
244 return (IICBUS_WRITE(device_get_parent(bus), buf, len, sent, timeout));
250 * Read a block of data from the slave previously started by
254 iicbus_read(device_t bus, char *buf, int len, int *read, int last, int delay)
256 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
258 /* a slave must have been started with the appropriate address */
259 if (!sc->started || !(sc->started & LSB))
262 return (IICBUS_READ(device_get_parent(bus), buf, len, read, last, delay));
266 * iicbus_write_byte()
268 * Write a byte to the slave previously started by iicbus_start() call
271 iicbus_write_byte(device_t bus, char byte, int timeout)
276 return (iicbus_write(bus, &data, 1, &sent, timeout));
282 * Read a byte from the slave previously started by iicbus_start() call
285 iicbus_read_byte(device_t bus, char *byte, int timeout)
289 return (iicbus_read(bus, byte, 1, &read, IIC_LAST_READ, timeout));
293 * iicbus_block_write()
295 * Write a block of data to slave ; start/stop protocol managed
298 iicbus_block_write(device_t bus, u_char slave, char *buf, int len, int *sent)
300 u_char addr = slave & ~LSB;
303 if ((error = iicbus_start(bus, addr, 0)))
306 error = iicbus_write(bus, buf, len, sent, 0);
314 * iicbus_block_read()
316 * Read a block of data from slave ; start/stop protocol managed
319 iicbus_block_read(device_t bus, u_char slave, char *buf, int len, int *read)
321 u_char addr = slave | LSB;
324 if ((error = iicbus_start(bus, addr, 0)))
327 error = iicbus_read(bus, buf, len, read, IIC_LAST_READ, 0);
337 * Do an aribtrary number of transfers on the iicbus. We pass these
338 * raw requests to the bridge driver. If the bridge driver supports
339 * them directly, then it manages all the details. If not, it can use
340 * the helper function iicbus_transfer_gen() which will do the
341 * transfers at a low level.
343 * Pointers passed in as part of iic_msg must be kernel pointers.
344 * Callers that have user addresses to manage must do so on their own.
347 iicbus_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs)
349 return (IICBUS_TRANSFER(device_get_parent(bus), msgs, nmsgs));
353 * Generic version of iicbus_transfer that calls the appropriate
354 * routines to accomplish this. See note above about acceptable
358 iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
360 int i, error, lenread, lenwrote, nkid;
361 device_t *children, bus;
363 if ((error = device_get_children(dev, &children, &nkid)) != 0)
366 kfree(children, M_TEMP);
370 kfree(children, M_TEMP);
371 for (i = 0, error = 0; i < nmsgs && error == 0; i++) {
372 if (msgs[i].flags & IIC_M_RD)
373 error = iicbus_block_read(bus, msgs[i].slave,
374 msgs[i].buf, msgs[i].len, &lenread);
376 error = iicbus_block_write(bus, msgs[i].slave,
377 msgs[i].buf, msgs[i].len, &lenwrote);