]> CyberLeo.Net >> Repos - FreeBSD/FreeBSD.git/blob - sys/dev/iicbus/acpi_iicbus.c
Don't transmit mbufs that aren't yet ready on TOE sockets.
[FreeBSD/FreeBSD.git] / sys / dev / iicbus / acpi_iicbus.c
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2019-2020 Vladimir Kondratyev <wulf@FreeBSD.org>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/bus.h>
33 #include <sys/endian.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37 #include <sys/rman.h>
38
39 #include <machine/resource.h>
40
41 #include <contrib/dev/acpica/include/acpi.h>
42 #include <contrib/dev/acpica/include/accommon.h>
43 #include <contrib/dev/acpica/include/amlcode.h>
44 #include <dev/acpica/acpivar.h>
45
46 #include <dev/iicbus/iiconf.h>
47 #include <dev/iicbus/iicbus.h>
48
49 #define ACPI_IICBUS_LOCAL_BUFSIZE       32      /* Fits max SMBUS block size */
50
51 /*
52  * Make a copy of ACPI_RESOURCE_I2C_SERIALBUS type and replace "pointer to ACPI
53  * object name string" field with pointer to ACPI object itself.
54  * This saves us extra strdup()/free() pair on acpi_iicbus_get_i2cres call.
55  */
56 typedef ACPI_RESOURCE_I2C_SERIALBUS     ACPI_IICBUS_RESOURCE_I2C_SERIALBUS;
57 #define ResourceSource_Handle   ResourceSource.StringPtr
58
59 /* Hooks for the ACPI CA debugging infrastructure. */
60 #define _COMPONENT      ACPI_BUS
61 ACPI_MODULE_NAME("IIC")
62
63 struct gsb_buffer {
64         UINT8 status;
65         UINT8 len;
66         UINT8 data[];
67 } __packed;
68
69 struct acpi_iicbus_softc {
70         struct iicbus_softc     super_sc;
71         ACPI_CONNECTION_INFO    space_handler_info;
72         bool                    space_handler_installed;
73 };
74
75 struct acpi_iicbus_ivars {
76         struct iicbus_ivar      super_ivar;
77         ACPI_HANDLE             handle;
78 };
79
80 static int install_space_handler = 0;
81 TUNABLE_INT("hw.iicbus.enable_acpi_space_handler", &install_space_handler);
82
83 static inline bool
84 acpi_resource_is_i2c_serialbus(ACPI_RESOURCE *res)
85 {
86
87         return (res->Type == ACPI_RESOURCE_TYPE_SERIAL_BUS &&
88             res->Data.CommonSerialBus.Type == ACPI_RESOURCE_SERIAL_TYPE_I2C);
89 }
90
91 /*
92  * IICBUS Address space handler
93  */
94 static int
95 acpi_iicbus_sendb(device_t dev, u_char slave, char byte)
96 {
97         struct iic_msg msgs[] = {
98             { slave, IIC_M_WR, 1, &byte },
99         };
100
101         return (iicbus_transfer(dev, msgs, nitems(msgs)));
102 }
103
104 static int
105 acpi_iicbus_recvb(device_t dev, u_char slave, char *byte)
106 {
107         char buf;
108         struct iic_msg msgs[] = {
109             { slave, IIC_M_RD, 1, &buf },
110         };
111         int error;
112
113         error = iicbus_transfer(dev, msgs, nitems(msgs));
114         if (error == 0)
115                 *byte = buf;
116
117         return (error);
118 }
119
120 static int
121 acpi_iicbus_write(device_t dev, u_char slave, char cmd, void *buf,
122     uint16_t buflen)
123 {
124         struct iic_msg msgs[] = {
125             { slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },
126             { slave, IIC_M_WR | IIC_M_NOSTART, buflen, buf },
127         };
128
129         return (iicbus_transfer(dev, msgs, nitems(msgs)));
130 }
131
132 static int
133 acpi_iicbus_read(device_t dev, u_char slave, char cmd, void *buf,
134     uint16_t buflen)
135 {
136         uint8_t local_buffer[ACPI_IICBUS_LOCAL_BUFSIZE];
137         struct iic_msg msgs[] = {
138             { slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },
139             { slave, IIC_M_RD, buflen, NULL },
140         };
141         int error;
142
143         if (buflen <= sizeof(local_buffer))
144                 msgs[1].buf = local_buffer;
145         else
146                 msgs[1].buf = malloc(buflen, M_DEVBUF, M_WAITOK);
147         error = iicbus_transfer(dev, msgs, nitems(msgs));
148         if (error == 0)
149                 memcpy(buf, msgs[1].buf, buflen);
150         if (msgs[1].buf != local_buffer)
151                 free(msgs[1].buf, M_DEVBUF);
152
153         return (error);
154 }
155
156 static int
157 acpi_iicbus_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
158 {
159         uint8_t bytes[2] = { cmd, count };
160         struct iic_msg msgs[] = {
161             { slave, IIC_M_WR | IIC_M_NOSTOP, nitems(bytes), bytes },
162             { slave, IIC_M_WR | IIC_M_NOSTART, count, buf },
163         };
164
165         if (count == 0)
166                 return (errno2iic(EINVAL));
167
168         return (iicbus_transfer(dev, msgs, nitems(msgs)));
169 }
170
171 static int
172 acpi_iicbus_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)
173 {
174         uint8_t local_buffer[ACPI_IICBUS_LOCAL_BUFSIZE];
175         u_char len;
176         struct iic_msg msgs[] = {
177             { slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },
178             { slave, IIC_M_RD | IIC_M_NOSTOP, 1, &len },
179         };
180         struct iic_msg block_msg[] = {
181             { slave, IIC_M_RD | IIC_M_NOSTART, 0, NULL },
182         };
183         device_t parent = device_get_parent(dev);
184         int error;
185
186         /* Have to do this because the command is split in two transfers. */
187         error = iicbus_request_bus(parent, dev, IIC_WAIT);
188         if (error == 0)
189                 error = iicbus_transfer(dev, msgs, nitems(msgs));
190         if (error == 0) {
191                 /*
192                  * If the slave offers an empty reply,
193                  * read one byte to generate the stop or abort.
194                  */
195                 if (len == 0)
196                         block_msg[0].len = 1;
197                 else
198                         block_msg[0].len = len;
199                 if (len <= sizeof(local_buffer))
200                         block_msg[0].buf = local_buffer;
201                 else
202                         block_msg[0].buf = malloc(len, M_DEVBUF, M_WAITOK);
203                 error = iicbus_transfer(dev, block_msg, nitems(block_msg));
204                 if (len == 0)
205                         error = errno2iic(EBADMSG);
206                 if (error == 0) {
207                         *count = len;
208                         memcpy(buf, block_msg[0].buf, len);
209                 }
210                 if (block_msg[0].buf != local_buffer)
211                         free(block_msg[0].buf, M_DEVBUF);
212         }
213         (void)iicbus_release_bus(parent, dev);
214         return (error);
215 }
216
217 static ACPI_STATUS
218 acpi_iicbus_space_handler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address,
219     UINT32 BitWidth, UINT64 *Value, void *HandlerContext, void *RegionContext)
220 {
221         struct gsb_buffer *gsb;
222         struct acpi_iicbus_softc *sc;
223         device_t dev;
224         ACPI_CONNECTION_INFO *info;
225         ACPI_RESOURCE_I2C_SERIALBUS *sb;
226         ACPI_RESOURCE *res;
227         ACPI_STATUS s;
228         int val;
229
230         gsb = (struct gsb_buffer *)Value;
231         if (gsb == NULL)
232                 return (AE_BAD_PARAMETER);
233
234         info = HandlerContext;
235         s = AcpiBufferToResource(info->Connection, info->Length, &res);
236         if (ACPI_FAILURE(s))
237                 return (s);
238
239         if (!acpi_resource_is_i2c_serialbus(res)) {
240                 s = AE_BAD_PARAMETER;
241                 goto err;
242         }
243
244         sb = &res->Data.I2cSerialBus;
245
246         /* XXX Ignore 10bit addressing for now */
247         if (sb->AccessMode == ACPI_I2C_10BIT_MODE) {
248                 s = AE_BAD_PARAMETER;
249                 goto err;
250         }
251
252 #define AML_FIELD_ATTRIB_MASK           0x0F
253 #define AML_FIELD_ATTRIO(attr, io)      (((attr) << 16) | (io))
254
255         Function &= AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_MASK, ACPI_IO_MASK);
256         sc = __containerof(info, struct acpi_iicbus_softc, space_handler_info);
257         dev = sc->super_sc.dev;
258
259         switch (Function) {
260         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_SEND_RECEIVE, ACPI_READ):
261                 val = acpi_iicbus_recvb(dev, sb->SlaveAddress, gsb->data);
262                 break;
263
264         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_SEND_RECEIVE, ACPI_WRITE):
265                 val = acpi_iicbus_sendb(dev, sb->SlaveAddress, gsb->data[0]);
266                 break;
267
268         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BYTE, ACPI_READ):
269                 val = acpi_iicbus_read(dev, sb->SlaveAddress, Address,
270                     gsb->data, 1);
271                 break;
272
273         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BYTE, ACPI_WRITE):
274                 val = acpi_iicbus_write(dev, sb->SlaveAddress, Address,
275                     gsb->data, 1);
276                 break;
277
278         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_WORD, ACPI_READ):
279                 val = acpi_iicbus_read(dev, sb->SlaveAddress, Address,
280                     gsb->data, 2);
281                 break;
282
283         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_WORD, ACPI_WRITE):
284                 val = acpi_iicbus_write(dev, sb->SlaveAddress, Address,
285                     gsb->data, 2);
286                 break;
287
288         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BLOCK, ACPI_READ):
289                 val = acpi_iicbus_bread(dev, sb->SlaveAddress, Address,
290                     &gsb->len, gsb->data);
291                 break;
292
293         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BLOCK, ACPI_WRITE):
294                 val = acpi_iicbus_bwrite(dev, sb->SlaveAddress, Address,
295                     gsb->len, gsb->data);
296                 break;
297
298         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BYTES, ACPI_READ):
299                 val = acpi_iicbus_read(dev, sb->SlaveAddress, Address,
300                     gsb->data, info->AccessLength);
301                 break;
302
303         case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BYTES, ACPI_WRITE):
304                 val = acpi_iicbus_write(dev, sb->SlaveAddress, Address,
305                     gsb->data, info->AccessLength);
306                 break;
307
308         default:
309                 device_printf(dev, "protocol(0x%04x) is not supported.\n",
310                     Function);
311                 s = AE_BAD_PARAMETER;
312                 goto err;
313         }
314
315         gsb->status = val;
316
317 err:
318         ACPI_FREE(res);
319
320         return (s);
321 }
322
323 static int
324 acpi_iicbus_install_address_space_handler(struct acpi_iicbus_softc *sc)
325 {
326         ACPI_HANDLE handle;
327         ACPI_STATUS s;
328
329         handle = acpi_get_handle(device_get_parent(sc->super_sc.dev));
330         s = AcpiInstallAddressSpaceHandler(handle, ACPI_ADR_SPACE_GSBUS,
331             &acpi_iicbus_space_handler, NULL, &sc->space_handler_info);
332         if (ACPI_FAILURE(s)) {
333                 device_printf(sc->super_sc.dev,
334                     "Failed to install GSBUS Address Space Handler in ACPI\n");
335                 return (ENXIO);
336         }
337
338         return (0);
339 }
340
341 static int
342 acpi_iicbus_remove_address_space_handler(struct acpi_iicbus_softc *sc)
343 {
344         ACPI_HANDLE handle;
345         ACPI_STATUS s;
346
347         handle = acpi_get_handle(device_get_parent(sc->super_sc.dev));
348         s = AcpiRemoveAddressSpaceHandler(handle, ACPI_ADR_SPACE_GSBUS,
349             &acpi_iicbus_space_handler);
350         if (ACPI_FAILURE(s)) {
351                 device_printf(sc->super_sc.dev,
352                     "Failed to remove GSBUS Address Space Handler from ACPI\n");
353                 return (ENXIO);
354         }
355
356         return (0);
357 }
358
359 static ACPI_STATUS
360 acpi_iicbus_get_i2cres_cb(ACPI_RESOURCE *res, void *context)
361 {
362         ACPI_IICBUS_RESOURCE_I2C_SERIALBUS *sb = context;
363         ACPI_STATUS status;
364         ACPI_HANDLE handle;
365
366         if (acpi_resource_is_i2c_serialbus(res)) {
367                 status = AcpiGetHandle(ACPI_ROOT_OBJECT,
368                     res->Data.I2cSerialBus.ResourceSource.StringPtr, &handle);
369                 if (ACPI_FAILURE(status))
370                         return (status);
371                 memcpy(sb, &res->Data.I2cSerialBus,
372                     sizeof(ACPI_IICBUS_RESOURCE_I2C_SERIALBUS));
373                 /*
374                  * replace "pointer to ACPI object name string" field
375                  * with pointer to ACPI object itself.
376                  */
377                 sb->ResourceSource_Handle = handle;
378                 return (AE_CTRL_TERMINATE);
379         } else if (res->Type == ACPI_RESOURCE_TYPE_END_TAG)
380                 return (AE_NOT_FOUND);
381
382         return (AE_OK);
383 }
384
385 static ACPI_STATUS
386 acpi_iicbus_get_i2cres(ACPI_HANDLE handle, ACPI_RESOURCE_I2C_SERIALBUS *sb)
387 {
388
389         return (AcpiWalkResources(handle, "_CRS",
390             acpi_iicbus_get_i2cres_cb, sb));
391 }
392
393 static ACPI_STATUS
394 acpi_iicbus_parse_resources_cb(ACPI_RESOURCE *res, void *context)
395 {
396         device_t dev = context;
397         struct iicbus_ivar *super_devi = device_get_ivars(dev);
398         struct resource_list *rl = &super_devi->rl;
399         int irq, gpio_pin;
400
401         switch(res->Type) {
402         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
403                 if (res->Data.ExtendedIrq.InterruptCount > 0) {
404                         irq = res->Data.ExtendedIrq.Interrupts[0];
405                         if (bootverbose)
406                                 printf("  IRQ:               %d\n", irq);
407                         resource_list_add_next(rl, SYS_RES_IRQ, irq, irq, 1);
408                         return (AE_CTRL_TERMINATE);
409                 }
410                 break;
411         case ACPI_RESOURCE_TYPE_GPIO:
412                 if (res->Data.Gpio.ConnectionType ==
413                     ACPI_RESOURCE_GPIO_TYPE_INT) {
414                         /* Not supported by FreeBSD yet */
415                         gpio_pin = res->Data.Gpio.PinTable[0];
416                         if (bootverbose)
417                                 printf("  GPIO IRQ pin:      %d\n", gpio_pin);
418                         return (AE_CTRL_TERMINATE);
419                 }
420                 break;
421         default:
422                 break;
423         }
424
425         return (AE_OK);
426 }
427
428 static ACPI_STATUS
429 acpi_iicbus_parse_resources(ACPI_HANDLE handle, device_t dev)
430 {
431
432         return (AcpiWalkResources(handle, "_CRS",
433             acpi_iicbus_parse_resources_cb, dev));
434 }
435
436 static void
437 acpi_iicbus_dump_res(device_t dev, ACPI_IICBUS_RESOURCE_I2C_SERIALBUS *sb)
438 {
439         device_printf(dev, "found ACPI child\n");
440         printf("  SlaveAddress:      0x%04hx\n", sb->SlaveAddress);
441         printf("  ConnectionSpeed:   %uHz\n", sb->ConnectionSpeed);
442         printf("  SlaveMode:         %s\n",
443             sb->SlaveMode == ACPI_CONTROLLER_INITIATED ?
444             "ControllerInitiated" : "DeviceInitiated");
445         printf("  AddressingMode:    %uBit\n", sb->AccessMode == 0 ? 7 : 10);
446         printf("  ConnectionSharing: %s\n", sb->ConnectionSharing == 0 ?
447             "Exclusive" : "Shared");
448 }
449
450 static device_t
451 acpi_iicbus_add_child(device_t dev, u_int order, const char *name, int unit)
452 {
453
454         return (iicbus_add_child_common(
455             dev, order, name, unit, sizeof(struct acpi_iicbus_ivars)));
456 }
457
458 static ACPI_STATUS
459 acpi_iicbus_enumerate_child(ACPI_HANDLE handle, UINT32 level,
460     void *context, void **result)
461 {
462         device_t iicbus, child, acpi_child, acpi0;
463         struct iicbus_softc *super_sc;
464         ACPI_IICBUS_RESOURCE_I2C_SERIALBUS sb;
465         ACPI_STATUS status;
466         UINT32 sta;
467
468         iicbus = context;
469         super_sc = device_get_softc(iicbus);
470
471         /*
472          * If no _STA method or if it failed, then assume that
473          * the device is present.
474          */
475         if (!ACPI_FAILURE(acpi_GetInteger(handle, "_STA", &sta)) &&
476             !ACPI_DEVICE_PRESENT(sta))
477                 return (AE_OK);
478
479         if (!acpi_has_hid(handle))
480                 return (AE_OK);
481
482         /*
483          * Read "I2C Serial Bus Connection Resource Descriptor"
484          * described in p.19.6.57 of ACPI specification.
485          */
486         bzero(&sb, sizeof(ACPI_IICBUS_RESOURCE_I2C_SERIALBUS));
487         if (ACPI_FAILURE(acpi_iicbus_get_i2cres(handle, &sb)) ||
488             sb.SlaveAddress == 0)
489                 return (AE_OK);
490         if (sb.ResourceSource_Handle !=
491             acpi_get_handle(device_get_parent(iicbus)))
492                 return (AE_OK);
493         if (bootverbose)
494                 acpi_iicbus_dump_res(iicbus, &sb);
495
496         /* Find out speed of the slowest slave */
497         if (super_sc->bus_freq == 0 || super_sc->bus_freq > sb.ConnectionSpeed)
498                 super_sc->bus_freq = sb.ConnectionSpeed;
499
500         /* Delete existing child of acpi bus */
501         acpi_child = acpi_get_device(handle);
502         if (acpi_child != NULL) {
503                 acpi0 = devclass_get_device(devclass_find("acpi"), 0);
504                 if (device_get_parent(acpi_child) != acpi0)
505                         return (AE_OK);
506
507                 if (device_is_attached(acpi_child))
508                         return (AE_OK);
509
510                 if (device_delete_child(acpi0, acpi_child) != 0)
511                         return (AE_OK);
512         }
513
514         child = BUS_ADD_CHILD(iicbus, 0, NULL, -1);
515         if (child == NULL) {
516                 device_printf(iicbus, "add child failed\n");
517                 return (AE_OK);
518         }
519
520         iicbus_set_addr(child, sb.SlaveAddress);
521         acpi_set_handle(child, handle);
522         (void)acpi_iicbus_parse_resources(handle, child);
523
524         /*
525          * Update ACPI-CA to use the IIC enumerated device_t for this handle.
526          */
527         status = AcpiAttachData(handle, acpi_fake_objhandler, child);
528         if (ACPI_FAILURE(status))
529                 printf("WARNING: Unable to attach object data to %s - %s\n",
530                     acpi_name(handle), AcpiFormatException(status));
531
532         return (AE_OK);
533 }
534
535 static ACPI_STATUS
536 acpi_iicbus_enumerate_children(device_t dev)
537 {
538
539         return (AcpiWalkNamespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
540             ACPI_UINT32_MAX, acpi_iicbus_enumerate_child, NULL, dev, NULL));
541 }
542
543 static void
544 acpi_iicbus_set_power_children(device_t dev, int state, bool all_children)
545 {
546         device_t *devlist;
547         int i, numdevs;
548
549         if (device_get_children(dev, &devlist, &numdevs) != 0)
550                 return;
551
552         for (i = 0; i < numdevs; i++)
553                 if (all_children || device_is_attached(devlist[i]) != 0)
554                         acpi_set_powerstate(devlist[i], state);
555
556         free(devlist, M_TEMP);
557 }
558
559 static int
560 acpi_iicbus_probe(device_t dev)
561 {
562         ACPI_HANDLE handle;
563         device_t controller;
564
565         if (acpi_disabled("iicbus"))
566                 return (ENXIO);
567
568         controller = device_get_parent(dev);
569         if (controller == NULL)
570                 return (ENXIO);
571
572         handle = acpi_get_handle(controller);
573         if (handle == NULL)
574                 return (ENXIO);
575
576         device_set_desc(dev, "Philips I2C bus (ACPI-hinted)");
577         return (BUS_PROBE_DEFAULT);
578 }
579
580 static int
581 acpi_iicbus_attach(device_t dev)
582 {
583         struct acpi_iicbus_softc *sc = device_get_softc(dev);
584         int error;
585
586         if (ACPI_FAILURE(acpi_iicbus_enumerate_children(dev)))
587                 device_printf(dev, "children enumeration failed\n");
588
589         acpi_iicbus_set_power_children(dev, ACPI_STATE_D0, true);
590         error = iicbus_attach_common(dev, sc->super_sc.bus_freq);
591         if (error == 0 && install_space_handler != 0 &&
592             acpi_iicbus_install_address_space_handler(sc) == 0)
593                 sc->space_handler_installed = true;
594
595         return (error);
596 }
597
598 static int
599 acpi_iicbus_detach(device_t dev)
600 {
601         struct acpi_iicbus_softc *sc = device_get_softc(dev);
602
603         if (sc->space_handler_installed)
604                 acpi_iicbus_remove_address_space_handler(sc);
605         acpi_iicbus_set_power_children(dev, ACPI_STATE_D3, false);
606
607         return (iicbus_detach(dev));
608 }
609
610 static int
611 acpi_iicbus_suspend(device_t dev)
612 {
613         int error;
614
615         error = bus_generic_suspend(dev);
616         if (error == 0)
617                 acpi_iicbus_set_power_children(dev, ACPI_STATE_D3, false);
618
619         return (error);
620 }
621
622 static int
623 acpi_iicbus_resume(device_t dev)
624 {
625
626         acpi_iicbus_set_power_children(dev, ACPI_STATE_D0, false);
627
628         return (bus_generic_resume(dev));
629 }
630
631 /*
632  * If this device is an ACPI child but no one claimed it, attempt
633  * to power it off.  We'll power it back up when a driver is added.
634  */
635 static void
636 acpi_iicbus_probe_nomatch(device_t bus, device_t child)
637 {
638
639         iicbus_probe_nomatch(bus, child);
640         acpi_set_powerstate(child, ACPI_STATE_D3);
641 }
642
643 /*
644  * If a new driver has a chance to probe a child, first power it up.
645  */
646 static void
647 acpi_iicbus_driver_added(device_t dev, driver_t *driver)
648 {
649         device_t child, *devlist;
650         int i, numdevs;
651
652         DEVICE_IDENTIFY(driver, dev);
653         if (device_get_children(dev, &devlist, &numdevs) != 0)
654                 return;
655
656         for (i = 0; i < numdevs; i++) {
657                 child = devlist[i];
658                 if (device_get_state(child) == DS_NOTPRESENT) {
659                         acpi_set_powerstate(child, ACPI_STATE_D0);
660                         if (device_probe_and_attach(child) != 0)
661                                 acpi_set_powerstate(child, ACPI_STATE_D3);
662                 }
663         }
664         free(devlist, M_TEMP);
665 }
666
667 static void
668 acpi_iicbus_child_deleted(device_t bus, device_t child)
669 {
670         struct acpi_iicbus_ivars *devi = device_get_ivars(child);
671
672         if (acpi_get_device(devi->handle) == child)
673                 AcpiDetachData(devi->handle, acpi_fake_objhandler);
674 }
675
676 static int
677 acpi_iicbus_read_ivar(device_t bus, device_t child, int which, uintptr_t *res)
678 {
679         struct acpi_iicbus_ivars *devi = device_get_ivars(child);
680
681         switch (which) {
682         case ACPI_IVAR_HANDLE:
683                 *res = (uintptr_t)devi->handle;
684                 break;
685         default:
686                 return (iicbus_read_ivar(bus, child, which, res));
687         }
688
689         return (0);
690 }
691
692 static int
693 acpi_iicbus_write_ivar(device_t bus, device_t child, int which, uintptr_t val)
694 {
695         struct acpi_iicbus_ivars *devi = device_get_ivars(child);
696
697         switch (which) {
698         case ACPI_IVAR_HANDLE:
699                 if (devi->handle != NULL)
700                         return (EINVAL);
701                 devi->handle = (ACPI_HANDLE)val;
702                 break;
703         default:
704                 return (iicbus_write_ivar(bus, child, which, val));
705         }
706
707         return (0);
708 }
709
710 /* Location hint for devctl(8). Concatenate IIC and ACPI hints. */
711 static int
712 acpi_iicbus_child_location_str(device_t bus, device_t child,
713     char *buf, size_t buflen)
714 {
715         struct acpi_iicbus_ivars *devi = device_get_ivars(child);
716         int error;
717
718         /* read IIC location hint string into the buffer. */
719         error = iicbus_child_location_str(bus, child, buf, buflen);
720         if (error != 0)
721                 return (error);
722
723         /* Place ACPI string right after IIC one's terminating NUL. */
724         if (devi->handle != NULL &&
725             ((buf[0] != '\0' && strlcat(buf, " ", buflen) >= buflen) ||
726              strlcat(buf, "handle=", buflen) >= buflen ||
727              strlcat(buf, acpi_name(devi->handle), buflen) >= buflen))
728                 return (EOVERFLOW);
729
730         return (0);
731 }
732
733 /* PnP information for devctl(8). Concatenate IIC and ACPI info strings. */
734 static int
735 acpi_iicbus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
736     size_t buflen)
737 {
738         struct acpi_iicbus_ivars *devi = device_get_ivars(child);
739         size_t acpi_offset;
740         int error;
741
742         /* read IIC PnP string into the buffer. */
743         error = iicbus_child_pnpinfo_str(bus, child, buf, buflen);
744         if (error != 0)
745                 return (error);
746
747         if (devi->handle == NULL)
748                 return (0);
749
750         /* Place ACPI string right after IIC one's terminating NUL. */
751         acpi_offset = strlen(buf);
752         if (acpi_offset != 0)
753                 acpi_offset++;
754         error = acpi_pnpinfo_str(devi->handle, buf + acpi_offset,
755             buflen - acpi_offset);
756
757         /* Coalesce both strings if they are not empty. */
758         if (acpi_offset > 0 && acpi_offset < buflen && buf[acpi_offset] != 0)
759                 buf[acpi_offset - 1] = ' ';
760
761         return (error);
762 }
763
764 static device_method_t acpi_iicbus_methods[] = {
765         /* Device interface */
766         DEVMETHOD(device_probe,         acpi_iicbus_probe),
767         DEVMETHOD(device_attach,        acpi_iicbus_attach),
768         DEVMETHOD(device_detach,        acpi_iicbus_detach),
769         DEVMETHOD(device_suspend,       acpi_iicbus_suspend),
770         DEVMETHOD(device_resume,        acpi_iicbus_resume),
771
772         /* Bus interface */
773         DEVMETHOD(bus_add_child,        acpi_iicbus_add_child),
774         DEVMETHOD(bus_probe_nomatch,    acpi_iicbus_probe_nomatch),
775         DEVMETHOD(bus_driver_added,     acpi_iicbus_driver_added),
776         DEVMETHOD(bus_child_deleted,    acpi_iicbus_child_deleted),
777         DEVMETHOD(bus_read_ivar,        acpi_iicbus_read_ivar),
778         DEVMETHOD(bus_write_ivar,       acpi_iicbus_write_ivar),
779         DEVMETHOD(bus_child_location_str,acpi_iicbus_child_location_str),
780         DEVMETHOD(bus_child_pnpinfo_str,acpi_iicbus_child_pnpinfo_str),
781
782         DEVMETHOD_END,
783 };
784
785 DEFINE_CLASS_1(iicbus, acpi_iicbus_driver, acpi_iicbus_methods,
786     sizeof(struct acpi_iicbus_softc), iicbus_driver);
787 MODULE_VERSION(acpi_iicbus, 1);
788 MODULE_DEPEND(acpi_iicbus, acpi, 1, 1, 1);