1/*-
2 * Copyright (c) 1998 Nicolas Souchu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 1998 Nicolas Souchu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
|
28__FBSDID("$FreeBSD: head/sys/dev/iicbus/iiconf.c 289095 2015-10-09 23:20:08Z ian $");
| 28__FBSDID("$FreeBSD: head/sys/dev/iicbus/iiconf.c 289097 2015-10-09 23:58:19Z ian $");
|
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/lock.h>
33#include <sys/malloc.h>
34#include <sys/module.h>
35#include <sys/mutex.h>
36#include <sys/bus.h>
37
38#include <dev/iicbus/iiconf.h>
39#include <dev/iicbus/iicbus.h>
40#include "iicbus_if.h"
41
42/*
43 * Translate IIC_Exxxxx status values to vaguely-equivelent errno values.
44 */
45int
46iic2errno(int iic_status)
47{
48 switch (iic_status) {
49 case IIC_NOERR: return (0);
50 case IIC_EBUSERR: return (EALREADY);
51 case IIC_ENOACK: return (EIO);
52 case IIC_ETIMEOUT: return (ETIMEDOUT);
53 case IIC_EBUSBSY: return (EWOULDBLOCK);
54 case IIC_ESTATUS: return (EPROTO);
55 case IIC_EUNDERFLOW: return (EIO);
56 case IIC_EOVERFLOW: return (EOVERFLOW);
57 case IIC_ENOTSUPP: return (EOPNOTSUPP);
58 case IIC_ENOADDR: return (EADDRNOTAVAIL);
59 case IIC_ERESOURCE: return (ENOMEM);
60 default: return (EIO);
61 }
62}
63
64/*
65 * iicbus_intr()
66 */
67void
68iicbus_intr(device_t bus, int event, char *buf)
69{
70 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
71
72 /* call owner's intr routine */
73 if (sc->owner)
74 IICBUS_INTR(sc->owner, event, buf);
75
76 return;
77}
78
79static int
80iicbus_poll(struct iicbus_softc *sc, int how)
81{
82 int error;
83
84 IICBUS_ASSERT_LOCKED(sc);
85 switch (how) {
86 case IIC_WAIT | IIC_INTR:
87 error = mtx_sleep(sc, &sc->lock, IICPRI|PCATCH, "iicreq", 0);
88 break;
89
90 case IIC_WAIT | IIC_NOINTR:
91 error = mtx_sleep(sc, &sc->lock, IICPRI, "iicreq", 0);
92 break;
93
94 default:
95 return (EWOULDBLOCK);
96 }
97
98 return (error);
99}
100
101/*
102 * iicbus_request_bus()
103 *
104 * Allocate the device to perform transfers.
105 *
106 * how : IIC_WAIT or IIC_DONTWAIT
107 */
108int
109iicbus_request_bus(device_t bus, device_t dev, int how)
110{
111 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
112 int error = 0;
113
114 IICBUS_LOCK(sc);
115
116 while ((error == 0) && (sc->owner != NULL))
117 error = iicbus_poll(sc, how);
118
119 if (error == 0) {
120 sc->owner = dev;
121 /*
122 * Drop the lock around the call to the bus driver.
123 * This call should be allowed to sleep in the IIC_WAIT case.
124 * Drivers might also need to grab locks that would cause LOR
125 * if our lock is held.
126 */
127 IICBUS_UNLOCK(sc);
128 /* Ask the underlying layers if the request is ok */
129 error = IICBUS_CALLBACK(device_get_parent(bus),
130 IIC_REQUEST_BUS, (caddr_t)&how);
131 IICBUS_LOCK(sc);
132
133 if (error != 0) {
134 sc->owner = NULL;
135 wakeup_one(sc);
136 }
137 }
138
139
140 IICBUS_UNLOCK(sc);
141
142 return (error);
143}
144
145/*
146 * iicbus_release_bus()
147 *
148 * Release the device allocated with iicbus_request_dev()
149 */
150int
151iicbus_release_bus(device_t bus, device_t dev)
152{
153 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
154 int error;
155
156 IICBUS_LOCK(sc);
157
158 if (sc->owner != dev) {
159 IICBUS_UNLOCK(sc);
160 return (EACCES);
161 }
162
163 /*
164 * Drop the lock around the call to the bus driver.
165 * This call should be allowed to sleep in the IIC_WAIT case.
166 * Drivers might also need to grab locks that would cause LOR
167 * if our lock is held.
168 */
169 IICBUS_UNLOCK(sc);
170 /* Ask the underlying layers if the release is ok */
171 error = IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS, NULL);
172
173 if (error == 0) {
174 IICBUS_LOCK(sc);
175 sc->owner = NULL;
176
177 /* wakeup a waiting thread */
178 wakeup_one(sc);
179 IICBUS_UNLOCK(sc);
180 }
181
182 return (error);
183}
184
185/*
186 * iicbus_started()
187 *
188 * Test if the iicbus is started by the controller
189 */
190int
191iicbus_started(device_t bus)
192{
193 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
194
195 return (sc->started);
196}
197
198/*
199 * iicbus_start()
200 *
201 * Send start condition to the slave addressed by 'slave'
202 */
203int
204iicbus_start(device_t bus, u_char slave, int timeout)
205{
206 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
207 int error = 0;
208
209 if (sc->started)
| 29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/lock.h>
33#include <sys/malloc.h>
34#include <sys/module.h>
35#include <sys/mutex.h>
36#include <sys/bus.h>
37
38#include <dev/iicbus/iiconf.h>
39#include <dev/iicbus/iicbus.h>
40#include "iicbus_if.h"
41
42/*
43 * Translate IIC_Exxxxx status values to vaguely-equivelent errno values.
44 */
45int
46iic2errno(int iic_status)
47{
48 switch (iic_status) {
49 case IIC_NOERR: return (0);
50 case IIC_EBUSERR: return (EALREADY);
51 case IIC_ENOACK: return (EIO);
52 case IIC_ETIMEOUT: return (ETIMEDOUT);
53 case IIC_EBUSBSY: return (EWOULDBLOCK);
54 case IIC_ESTATUS: return (EPROTO);
55 case IIC_EUNDERFLOW: return (EIO);
56 case IIC_EOVERFLOW: return (EOVERFLOW);
57 case IIC_ENOTSUPP: return (EOPNOTSUPP);
58 case IIC_ENOADDR: return (EADDRNOTAVAIL);
59 case IIC_ERESOURCE: return (ENOMEM);
60 default: return (EIO);
61 }
62}
63
64/*
65 * iicbus_intr()
66 */
67void
68iicbus_intr(device_t bus, int event, char *buf)
69{
70 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
71
72 /* call owner's intr routine */
73 if (sc->owner)
74 IICBUS_INTR(sc->owner, event, buf);
75
76 return;
77}
78
79static int
80iicbus_poll(struct iicbus_softc *sc, int how)
81{
82 int error;
83
84 IICBUS_ASSERT_LOCKED(sc);
85 switch (how) {
86 case IIC_WAIT | IIC_INTR:
87 error = mtx_sleep(sc, &sc->lock, IICPRI|PCATCH, "iicreq", 0);
88 break;
89
90 case IIC_WAIT | IIC_NOINTR:
91 error = mtx_sleep(sc, &sc->lock, IICPRI, "iicreq", 0);
92 break;
93
94 default:
95 return (EWOULDBLOCK);
96 }
97
98 return (error);
99}
100
101/*
102 * iicbus_request_bus()
103 *
104 * Allocate the device to perform transfers.
105 *
106 * how : IIC_WAIT or IIC_DONTWAIT
107 */
108int
109iicbus_request_bus(device_t bus, device_t dev, int how)
110{
111 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
112 int error = 0;
113
114 IICBUS_LOCK(sc);
115
116 while ((error == 0) && (sc->owner != NULL))
117 error = iicbus_poll(sc, how);
118
119 if (error == 0) {
120 sc->owner = dev;
121 /*
122 * Drop the lock around the call to the bus driver.
123 * This call should be allowed to sleep in the IIC_WAIT case.
124 * Drivers might also need to grab locks that would cause LOR
125 * if our lock is held.
126 */
127 IICBUS_UNLOCK(sc);
128 /* Ask the underlying layers if the request is ok */
129 error = IICBUS_CALLBACK(device_get_parent(bus),
130 IIC_REQUEST_BUS, (caddr_t)&how);
131 IICBUS_LOCK(sc);
132
133 if (error != 0) {
134 sc->owner = NULL;
135 wakeup_one(sc);
136 }
137 }
138
139
140 IICBUS_UNLOCK(sc);
141
142 return (error);
143}
144
145/*
146 * iicbus_release_bus()
147 *
148 * Release the device allocated with iicbus_request_dev()
149 */
150int
151iicbus_release_bus(device_t bus, device_t dev)
152{
153 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
154 int error;
155
156 IICBUS_LOCK(sc);
157
158 if (sc->owner != dev) {
159 IICBUS_UNLOCK(sc);
160 return (EACCES);
161 }
162
163 /*
164 * Drop the lock around the call to the bus driver.
165 * This call should be allowed to sleep in the IIC_WAIT case.
166 * Drivers might also need to grab locks that would cause LOR
167 * if our lock is held.
168 */
169 IICBUS_UNLOCK(sc);
170 /* Ask the underlying layers if the release is ok */
171 error = IICBUS_CALLBACK(device_get_parent(bus), IIC_RELEASE_BUS, NULL);
172
173 if (error == 0) {
174 IICBUS_LOCK(sc);
175 sc->owner = NULL;
176
177 /* wakeup a waiting thread */
178 wakeup_one(sc);
179 IICBUS_UNLOCK(sc);
180 }
181
182 return (error);
183}
184
185/*
186 * iicbus_started()
187 *
188 * Test if the iicbus is started by the controller
189 */
190int
191iicbus_started(device_t bus)
192{
193 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
194
195 return (sc->started);
196}
197
198/*
199 * iicbus_start()
200 *
201 * Send start condition to the slave addressed by 'slave'
202 */
203int
204iicbus_start(device_t bus, u_char slave, int timeout)
205{
206 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
207 int error = 0;
208
209 if (sc->started)
|
210 return (EINVAL); /* bus already started */
| 210 return (IIC_ESTATUS); /* protocol error, bus already started */
|
211
212 if (!(error = IICBUS_START(device_get_parent(bus), slave, timeout)))
213 sc->started = slave;
214 else
215 sc->started = 0;
216
217 return (error);
218}
219
220/*
221 * iicbus_repeated_start()
222 *
223 * Send start condition to the slave addressed by 'slave'
224 */
225int
226iicbus_repeated_start(device_t bus, u_char slave, int timeout)
227{
228 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
229 int error = 0;
230
231 if (!sc->started)
| 211
212 if (!(error = IICBUS_START(device_get_parent(bus), slave, timeout)))
213 sc->started = slave;
214 else
215 sc->started = 0;
216
217 return (error);
218}
219
220/*
221 * iicbus_repeated_start()
222 *
223 * Send start condition to the slave addressed by 'slave'
224 */
225int
226iicbus_repeated_start(device_t bus, u_char slave, int timeout)
227{
228 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
229 int error = 0;
230
231 if (!sc->started)
|
232 return (EINVAL); /* bus should have been already started */
| 232 return (IIC_ESTATUS); /* protocol error, bus not started */
|
233
234 if (!(error = IICBUS_REPEATED_START(device_get_parent(bus), slave, timeout)))
235 sc->started = slave;
236 else
237 sc->started = 0;
238
239 return (error);
240}
241
242/*
243 * iicbus_stop()
244 *
245 * Send stop condition to the bus
246 */
247int
248iicbus_stop(device_t bus)
249{
250 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
251 int error = 0;
252
253 if (!sc->started)
| 233
234 if (!(error = IICBUS_REPEATED_START(device_get_parent(bus), slave, timeout)))
235 sc->started = slave;
236 else
237 sc->started = 0;
238
239 return (error);
240}
241
242/*
243 * iicbus_stop()
244 *
245 * Send stop condition to the bus
246 */
247int
248iicbus_stop(device_t bus)
249{
250 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
251 int error = 0;
252
253 if (!sc->started)
|
254 return (EINVAL); /* bus not started */
| 254 return (IIC_ESTATUS); /* protocol error, bus not started */
|
255
256 error = IICBUS_STOP(device_get_parent(bus));
257
258 /* refuse any further access */
259 sc->started = 0;
260
261 return (error);
262}
263
264/*
265 * iicbus_write()
266 *
267 * Write a block of data to the slave previously started by
268 * iicbus_start() call
269 */
270int
271iicbus_write(device_t bus, const char *buf, int len, int *sent, int timeout)
272{
273 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
274
275 /* a slave must have been started for writing */
276 if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) != 0))
| 255
256 error = IICBUS_STOP(device_get_parent(bus));
257
258 /* refuse any further access */
259 sc->started = 0;
260
261 return (error);
262}
263
264/*
265 * iicbus_write()
266 *
267 * Write a block of data to the slave previously started by
268 * iicbus_start() call
269 */
270int
271iicbus_write(device_t bus, const char *buf, int len, int *sent, int timeout)
272{
273 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
274
275 /* a slave must have been started for writing */
276 if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) != 0))
|
277 return (EINVAL);
| 277 return (IIC_ESTATUS);
|
278
279 return (IICBUS_WRITE(device_get_parent(bus), buf, len, sent, timeout));
280}
281
282/*
283 * iicbus_read()
284 *
285 * Read a block of data from the slave previously started by
286 * iicbus_read() call
287 */
288int
289iicbus_read(device_t bus, char *buf, int len, int *read, int last, int delay)
290{
291 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
292
293 /* a slave must have been started for reading */
294 if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) == 0))
| 278
279 return (IICBUS_WRITE(device_get_parent(bus), buf, len, sent, timeout));
280}
281
282/*
283 * iicbus_read()
284 *
285 * Read a block of data from the slave previously started by
286 * iicbus_read() call
287 */
288int
289iicbus_read(device_t bus, char *buf, int len, int *read, int last, int delay)
290{
291 struct iicbus_softc *sc = (struct iicbus_softc *)device_get_softc(bus);
292
293 /* a slave must have been started for reading */
294 if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) == 0))
|
295 return (EINVAL);
| 295 return (IIC_ESTATUS);
|
296
297 return (IICBUS_READ(device_get_parent(bus), buf, len, read, last, delay));
298}
299
300/*
301 * iicbus_write_byte()
302 *
303 * Write a byte to the slave previously started by iicbus_start() call
304 */
305int
306iicbus_write_byte(device_t bus, char byte, int timeout)
307{
| 296
297 return (IICBUS_READ(device_get_parent(bus), buf, len, read, last, delay));
298}
299
300/*
301 * iicbus_write_byte()
302 *
303 * Write a byte to the slave previously started by iicbus_start() call
304 */
305int
306iicbus_write_byte(device_t bus, char byte, int timeout)
307{
|
| 308 struct iicbus_softc *sc = device_get_softc(bus);
|
308 char data = byte;
309 int sent;
310
| 309 char data = byte;
310 int sent;
311
|
| 312 /* a slave must have been started for writing */
313 if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) != 0))
314 return (IIC_ESTATUS);
315
|
311 return (iicbus_write(bus, &data, 1, &sent, timeout));
312}
313
314/*
315 * iicbus_read_byte()
316 *
317 * Read a byte from the slave previously started by iicbus_start() call
318 */
319int
320iicbus_read_byte(device_t bus, char *byte, int timeout)
321{
| 316 return (iicbus_write(bus, &data, 1, &sent, timeout));
317}
318
319/*
320 * iicbus_read_byte()
321 *
322 * Read a byte from the slave previously started by iicbus_start() call
323 */
324int
325iicbus_read_byte(device_t bus, char *byte, int timeout)
326{
|
| 327 struct iicbus_softc *sc = device_get_softc(bus);
|
322 int read;
323
| 328 int read;
329
|
| 330 /* a slave must have been started for reading */
331 if (sc->started == 0 || (sc->strict != 0 && (sc->started & LSB) == 0))
332 return (IIC_ESTATUS);
333
|
324 return (iicbus_read(bus, byte, 1, &read, IIC_LAST_READ, timeout));
325}
326
327/*
328 * iicbus_block_write()
329 *
330 * Write a block of data to slave ; start/stop protocol managed
331 */
332int
333iicbus_block_write(device_t bus, u_char slave, char *buf, int len, int *sent)
334{
335 u_char addr = slave & ~LSB;
336 int error;
337
338 if ((error = iicbus_start(bus, addr, 0)))
339 return (error);
340
341 error = iicbus_write(bus, buf, len, sent, 0);
342
343 iicbus_stop(bus);
344
345 return (error);
346}
347
348/*
349 * iicbus_block_read()
350 *
351 * Read a block of data from slave ; start/stop protocol managed
352 */
353int
354iicbus_block_read(device_t bus, u_char slave, char *buf, int len, int *read)
355{
356 u_char addr = slave | LSB;
357 int error;
358
359 if ((error = iicbus_start(bus, addr, 0)))
360 return (error);
361
362 error = iicbus_read(bus, buf, len, read, IIC_LAST_READ, 0);
363
364 iicbus_stop(bus);
365
366 return (error);
367}
368
369/*
370 * iicbus_transfer()
371 *
372 * Do an aribtrary number of transfers on the iicbus. We pass these
373 * raw requests to the bridge driver. If the bridge driver supports
374 * them directly, then it manages all the details. If not, it can use
375 * the helper function iicbus_transfer_gen() which will do the
376 * transfers at a low level.
377 *
378 * Pointers passed in as part of iic_msg must be kernel pointers.
379 * Callers that have user addresses to manage must do so on their own.
380 */
381int
382iicbus_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs)
383{
| 334 return (iicbus_read(bus, byte, 1, &read, IIC_LAST_READ, timeout));
335}
336
337/*
338 * iicbus_block_write()
339 *
340 * Write a block of data to slave ; start/stop protocol managed
341 */
342int
343iicbus_block_write(device_t bus, u_char slave, char *buf, int len, int *sent)
344{
345 u_char addr = slave & ~LSB;
346 int error;
347
348 if ((error = iicbus_start(bus, addr, 0)))
349 return (error);
350
351 error = iicbus_write(bus, buf, len, sent, 0);
352
353 iicbus_stop(bus);
354
355 return (error);
356}
357
358/*
359 * iicbus_block_read()
360 *
361 * Read a block of data from slave ; start/stop protocol managed
362 */
363int
364iicbus_block_read(device_t bus, u_char slave, char *buf, int len, int *read)
365{
366 u_char addr = slave | LSB;
367 int error;
368
369 if ((error = iicbus_start(bus, addr, 0)))
370 return (error);
371
372 error = iicbus_read(bus, buf, len, read, IIC_LAST_READ, 0);
373
374 iicbus_stop(bus);
375
376 return (error);
377}
378
379/*
380 * iicbus_transfer()
381 *
382 * Do an aribtrary number of transfers on the iicbus. We pass these
383 * raw requests to the bridge driver. If the bridge driver supports
384 * them directly, then it manages all the details. If not, it can use
385 * the helper function iicbus_transfer_gen() which will do the
386 * transfers at a low level.
387 *
388 * Pointers passed in as part of iic_msg must be kernel pointers.
389 * Callers that have user addresses to manage must do so on their own.
390 */
391int
392iicbus_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs)
393{
|
| 394
|
384 return (IICBUS_TRANSFER(device_get_parent(bus), msgs, nmsgs));
385}
386
387/*
388 * Generic version of iicbus_transfer that calls the appropriate
389 * routines to accomplish this. See note above about acceptable
390 * buffer addresses.
391 */
392int
393iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
394{
395 int i, error, lenread, lenwrote, nkid, rpstart, addr;
396 device_t *children, bus;
397 bool nostop;
398
399 if ((error = device_get_children(dev, &children, &nkid)) != 0)
| 395 return (IICBUS_TRANSFER(device_get_parent(bus), msgs, nmsgs));
396}
397
398/*
399 * Generic version of iicbus_transfer that calls the appropriate
400 * routines to accomplish this. See note above about acceptable
401 * buffer addresses.
402 */
403int
404iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
405{
406 int i, error, lenread, lenwrote, nkid, rpstart, addr;
407 device_t *children, bus;
408 bool nostop;
409
410 if ((error = device_get_children(dev, &children, &nkid)) != 0)
|
400 return (error);
| 411 return (IIC_ERESOURCE);
|
401 if (nkid != 1) {
402 free(children, M_TEMP);
| 412 if (nkid != 1) {
413 free(children, M_TEMP);
|
403 return (EIO);
| 414 return (IIC_ENOTSUPP);
|
404 }
405 bus = children[0];
406 rpstart = 0;
407 free(children, M_TEMP);
408 nostop = iicbus_get_nostop(dev);
409 for (i = 0, error = 0; i < nmsgs && error == 0; i++) {
410 addr = msgs[i].slave;
411 if (msgs[i].flags & IIC_M_RD)
412 addr |= LSB;
413 else
414 addr &= ~LSB;
415
416 if (!(msgs[i].flags & IIC_M_NOSTART)) {
417 if (rpstart)
418 error = iicbus_repeated_start(bus, addr, 0);
419 else
420 error = iicbus_start(bus, addr, 0);
421 }
422 if (error != 0)
423 break;
424
425 if (msgs[i].flags & IIC_M_RD)
426 error = iicbus_read(bus, msgs[i].buf, msgs[i].len,
427 &lenread, IIC_LAST_READ, 0);
428 else
429 error = iicbus_write(bus, msgs[i].buf, msgs[i].len,
430 &lenwrote, 0);
431 if (error != 0)
432 break;
433
434 if ((msgs[i].flags & IIC_M_NOSTOP) != 0 ||
435 (nostop && i + 1 < nmsgs)) {
436 rpstart = 1; /* Next message gets repeated start */
437 } else {
438 rpstart = 0;
439 iicbus_stop(bus);
440 }
441 }
442 if (error != 0 && !nostop)
443 iicbus_stop(bus);
444 return (error);
445}
| 415 }
416 bus = children[0];
417 rpstart = 0;
418 free(children, M_TEMP);
419 nostop = iicbus_get_nostop(dev);
420 for (i = 0, error = 0; i < nmsgs && error == 0; i++) {
421 addr = msgs[i].slave;
422 if (msgs[i].flags & IIC_M_RD)
423 addr |= LSB;
424 else
425 addr &= ~LSB;
426
427 if (!(msgs[i].flags & IIC_M_NOSTART)) {
428 if (rpstart)
429 error = iicbus_repeated_start(bus, addr, 0);
430 else
431 error = iicbus_start(bus, addr, 0);
432 }
433 if (error != 0)
434 break;
435
436 if (msgs[i].flags & IIC_M_RD)
437 error = iicbus_read(bus, msgs[i].buf, msgs[i].len,
438 &lenread, IIC_LAST_READ, 0);
439 else
440 error = iicbus_write(bus, msgs[i].buf, msgs[i].len,
441 &lenwrote, 0);
442 if (error != 0)
443 break;
444
445 if ((msgs[i].flags & IIC_M_NOSTOP) != 0 ||
446 (nostop && i + 1 < nmsgs)) {
447 rpstart = 1; /* Next message gets repeated start */
448 } else {
449 rpstart = 0;
450 iicbus_stop(bus);
451 }
452 }
453 if (error != 0 && !nostop)
454 iicbus_stop(bus);
455 return (error);
456}
|