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 1.10 1999/12/03 08:41:02 mdodd Exp $
27 * $DragonFly: src/sys/bus/iicbus/iiconf.c,v 1.4 2003/08/07 21:16:45 dillon Exp $
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34 #include <sys/module.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);
59 * Allocate a new bus connected to the given parent device
62 iicbus_alloc_bus(device_t parent)
66 /* add the bus to the parent */
67 child = device_add_child(parent, "iicbus", -1);
73 iicbus_poll(struct iicbus_softc *sc, int how)
78 case (IIC_WAIT | IIC_INTR):
79 error = tsleep(sc, PCATCH, "iicreq", 0);
82 case (IIC_WAIT | IIC_NOINTR):
83 error = tsleep(sc, 0, "iicreq", 0);
95 * iicbus_request_bus()
97 * Allocate the device to perform transfers.
99 * how : IIC_WAIT or IIC_DONTWAIT
102 iicbus_request_bus(device_t bus, device_t dev, int how)
104 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
107 /* first, ask the underlying layers if the request is ok */
109 error = IICBUS_CALLBACK(device_get_parent(bus),
110 IIC_REQUEST_BUS, (caddr_t)&how);
112 error = iicbus_poll(sc, how);
113 } while (error == EWOULDBLOCK);
117 if (sc->owner && sc->owner != dev) {
120 error = iicbus_poll(sc, how);
128 /* free any allocated resource */
130 IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS,
138 * iicbus_release_bus()
140 * Release the device allocated with iicbus_request_dev()
143 iicbus_release_bus(device_t bus, device_t dev)
145 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
148 /* first, ask the underlying layers if the release is ok */
149 error = IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS, NULL);
155 if (sc->owner != dev) {
163 /* wakeup waiting processes */
172 * Test if the iicbus is started by the controller
175 iicbus_started(device_t bus)
177 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
179 return (sc->started);
185 * Send start condition to the slave addressed by 'slave'
188 iicbus_start(device_t bus, u_char slave, int timeout)
190 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
194 return (EINVAL); /* bus already started */
196 if (!(error = IICBUS_START(device_get_parent(bus), slave, timeout)))
205 * iicbus_repeated_start()
207 * Send start condition to the slave addressed by 'slave'
210 iicbus_repeated_start(device_t bus, u_char slave, int timeout)
212 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
216 return (EINVAL); /* bus should have been already started */
218 if (!(error = IICBUS_REPEATED_START(device_get_parent(bus), slave, timeout)))
229 * Send stop condition to the bus
232 iicbus_stop(device_t bus)
234 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
238 return (EINVAL); /* bus not started */
240 error = IICBUS_STOP(device_get_parent(bus));
242 /* refuse any further access */
251 * Write a block of data to the slave previously started by
252 * iicbus_start() call
255 iicbus_write(device_t bus, char *buf, int len, int *sent, int timeout)
257 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
259 /* a slave must have been started with the appropriate address */
260 if (!sc->started || (sc->started & LSB))
263 return (IICBUS_WRITE(device_get_parent(bus), buf, len, sent, timeout));
269 * Read a block of data from the slave previously started by
273 iicbus_read(device_t bus, char *buf, int len, int *read, int last, int delay)
275 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
277 /* a slave must have been started with the appropriate address */
278 if (!sc->started || !(sc->started & LSB))
281 return (IICBUS_READ(device_get_parent(bus), buf, len, read, last, delay));
285 * iicbus_write_byte()
287 * Write a byte to the slave previously started by iicbus_start() call
290 iicbus_write_byte(device_t bus, char byte, int timeout)
295 return (iicbus_write(bus, &data, 1, &sent, timeout));
301 * Read a byte from the slave previously started by iicbus_start() call
304 iicbus_read_byte(device_t bus, char *byte, int timeout)
308 return (iicbus_read(bus, byte, 1, &read, IIC_LAST_READ, timeout));
312 * iicbus_block_write()
314 * Write a block of data to slave ; start/stop protocol managed
317 iicbus_block_write(device_t bus, u_char slave, char *buf, int len, int *sent)
319 u_char addr = slave & ~LSB;
322 if ((error = iicbus_start(bus, addr, 0)))
325 error = iicbus_write(bus, buf, len, sent, 0);
333 * iicbus_block_read()
335 * Read a block of data from slave ; start/stop protocol managed
338 iicbus_block_read(device_t bus, u_char slave, char *buf, int len, int *read)
340 u_char addr = slave | LSB;
343 if ((error = iicbus_start(bus, addr, 0)))
346 error = iicbus_read(bus, buf, len, read, IIC_LAST_READ, 0);
356 * Get the I2C 7 bits address of the device
359 iicbus_get_addr(device_t dev)
362 device_t parent = device_get_parent(dev);
364 BUS_READ_IVAR(parent, dev, IICBUS_IVAR_ADDR, &addr);
366 return ((u_char)addr);