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 1.5 2005/06/02 20:40:36 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>
36 #include <sys/thread2.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
);
60 * Allocate a new bus connected to the given parent device
63 iicbus_alloc_bus(device_t parent
)
67 /* add the bus to the parent */
68 child
= device_add_child(parent
, "iicbus", -1);
74 iicbus_poll(struct iicbus_softc
*sc
, int how
)
79 case (IIC_WAIT
| IIC_INTR
):
80 error
= tsleep(sc
, PCATCH
, "iicreq", 0);
83 case (IIC_WAIT
| IIC_NOINTR
):
84 error
= tsleep(sc
, 0, "iicreq", 0);
96 * iicbus_request_bus()
98 * Allocate the device to perform transfers.
100 * how : IIC_WAIT or IIC_DONTWAIT
103 iicbus_request_bus(device_t bus
, device_t dev
, int how
)
105 struct iicbus_softc
*sc
= (struct iicbus_softc
*)device_get_softc(bus
);
108 /* first, ask the underlying layers if the request is ok */
110 error
= IICBUS_CALLBACK(device_get_parent(bus
),
111 IIC_REQUEST_BUS
, (caddr_t
)&how
);
113 error
= iicbus_poll(sc
, how
);
114 } while (error
== EWOULDBLOCK
);
118 if (sc
->owner
&& sc
->owner
!= dev
) {
120 error
= iicbus_poll(sc
, how
);
127 /* free any allocated resource */
129 IICBUS_CALLBACK(device_get_parent(bus
), IIC_RELEASE_BUS
,
137 * iicbus_release_bus()
139 * Release the device allocated with iicbus_request_dev()
142 iicbus_release_bus(device_t bus
, device_t dev
)
144 struct iicbus_softc
*sc
= (struct iicbus_softc
*)device_get_softc(bus
);
147 /* first, ask the underlying layers if the release is ok */
148 error
= IICBUS_CALLBACK(device_get_parent(bus
), IIC_RELEASE_BUS
, NULL
);
154 if (sc
->owner
!= dev
) {
161 /* wakeup waiting processes */
170 * Test if the iicbus is started by the controller
173 iicbus_started(device_t bus
)
175 struct iicbus_softc
*sc
= (struct iicbus_softc
*)device_get_softc(bus
);
177 return (sc
->started
);
183 * Send start condition to the slave addressed by 'slave'
186 iicbus_start(device_t bus
, u_char slave
, int timeout
)
188 struct iicbus_softc
*sc
= (struct iicbus_softc
*)device_get_softc(bus
);
192 return (EINVAL
); /* bus already started */
194 if (!(error
= IICBUS_START(device_get_parent(bus
), slave
, timeout
)))
203 * iicbus_repeated_start()
205 * Send start condition to the slave addressed by 'slave'
208 iicbus_repeated_start(device_t bus
, u_char slave
, int timeout
)
210 struct iicbus_softc
*sc
= (struct iicbus_softc
*)device_get_softc(bus
);
214 return (EINVAL
); /* bus should have been already started */
216 if (!(error
= IICBUS_REPEATED_START(device_get_parent(bus
), slave
, timeout
)))
227 * Send stop condition to the bus
230 iicbus_stop(device_t bus
)
232 struct iicbus_softc
*sc
= (struct iicbus_softc
*)device_get_softc(bus
);
236 return (EINVAL
); /* bus not started */
238 error
= IICBUS_STOP(device_get_parent(bus
));
240 /* refuse any further access */
249 * Write a block of data to the slave previously started by
250 * iicbus_start() call
253 iicbus_write(device_t bus
, char *buf
, int len
, int *sent
, int timeout
)
255 struct iicbus_softc
*sc
= (struct iicbus_softc
*)device_get_softc(bus
);
257 /* a slave must have been started with the appropriate address */
258 if (!sc
->started
|| (sc
->started
& LSB
))
261 return (IICBUS_WRITE(device_get_parent(bus
), buf
, len
, sent
, timeout
));
267 * Read a block of data from the slave previously started by
271 iicbus_read(device_t bus
, char *buf
, int len
, int *read
, int last
, int delay
)
273 struct iicbus_softc
*sc
= (struct iicbus_softc
*)device_get_softc(bus
);
275 /* a slave must have been started with the appropriate address */
276 if (!sc
->started
|| !(sc
->started
& LSB
))
279 return (IICBUS_READ(device_get_parent(bus
), buf
, len
, read
, last
, delay
));
283 * iicbus_write_byte()
285 * Write a byte to the slave previously started by iicbus_start() call
288 iicbus_write_byte(device_t bus
, char byte
, int timeout
)
293 return (iicbus_write(bus
, &data
, 1, &sent
, timeout
));
299 * Read a byte from the slave previously started by iicbus_start() call
302 iicbus_read_byte(device_t bus
, char *byte
, int timeout
)
306 return (iicbus_read(bus
, byte
, 1, &read
, IIC_LAST_READ
, timeout
));
310 * iicbus_block_write()
312 * Write a block of data to slave ; start/stop protocol managed
315 iicbus_block_write(device_t bus
, u_char slave
, char *buf
, int len
, int *sent
)
317 u_char addr
= slave
& ~LSB
;
320 if ((error
= iicbus_start(bus
, addr
, 0)))
323 error
= iicbus_write(bus
, buf
, len
, sent
, 0);
331 * iicbus_block_read()
333 * Read a block of data from slave ; start/stop protocol managed
336 iicbus_block_read(device_t bus
, u_char slave
, char *buf
, int len
, int *read
)
338 u_char addr
= slave
| LSB
;
341 if ((error
= iicbus_start(bus
, addr
, 0)))
344 error
= iicbus_read(bus
, buf
, len
, read
, IIC_LAST_READ
, 0);
354 * Get the I2C 7 bits address of the device
357 iicbus_get_addr(device_t dev
)
360 device_t parent
= device_get_parent(dev
);
362 BUS_READ_IVAR(parent
, dev
, IICBUS_IVAR_ADDR
, &addr
);
364 return ((u_char
)addr
);