/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2019-2020 Vladimir Kondratyev <wulf@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/amlcode.h>
#include <dev/acpica/acpivar.h>
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#define ACPI_IICBUS_LOCAL_BUFSIZE 32 /* Fits max SMBUS block size */
/*
* Make a copy of ACPI_RESOURCE_I2C_SERIALBUS type and replace "pointer to ACPI
* object name string" field with pointer to ACPI object itself.
* This saves us extra strdup()/free() pair on acpi_iicbus_get_i2cres call.
*/
typedef ACPI_RESOURCE_I2C_SERIALBUS ACPI_IICBUS_RESOURCE_I2C_SERIALBUS;
#define ResourceSource_Handle ResourceSource.StringPtr
/* Hooks for the ACPI CA debugging infrastructure. */
#define _COMPONENT ACPI_BUS
ACPI_MODULE_NAME("IIC")
struct gsb_buffer {
UINT8 status;
UINT8 len;
UINT8 data[];
} __packed;
struct acpi_iicbus_softc {
struct iicbus_softc super_sc;
ACPI_CONNECTION_INFO space_handler_info;
bool space_handler_installed;
};
struct acpi_iicbus_ivars {
struct iicbus_ivar super_ivar;
ACPI_HANDLE handle;
};
static int install_space_handler = 0;
TUNABLE_INT("hw.iicbus.enable_acpi_space_handler", &install_space_handler);
static inline bool
acpi_resource_is_i2c_serialbus(ACPI_RESOURCE *res)
{
return (res->Type == ACPI_RESOURCE_TYPE_SERIAL_BUS &&
res->Data.CommonSerialBus.Type == ACPI_RESOURCE_SERIAL_TYPE_I2C);
}
/*
* IICBUS Address space handler
*/
static int
acpi_iicbus_sendb(device_t dev, u_char slave, char byte)
{
struct iic_msg msgs[] = {
{ slave, IIC_M_WR, 1, &byte },
};
return (iicbus_transfer(dev, msgs, nitems(msgs)));
}
static int
acpi_iicbus_recvb(device_t dev, u_char slave, char *byte)
{
char buf;
struct iic_msg msgs[] = {
{ slave, IIC_M_RD, 1, &buf },
};
int error;
error = iicbus_transfer(dev, msgs, nitems(msgs));
if (error == 0)
*byte = buf;
return (error);
}
static int
acpi_iicbus_write(device_t dev, u_char slave, char cmd, void *buf,
uint16_t buflen)
{
struct iic_msg msgs[] = {
{ slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },
{ slave, IIC_M_WR | IIC_M_NOSTART, buflen, buf },
};
return (iicbus_transfer(dev, msgs, nitems(msgs)));
}
static int
acpi_iicbus_read(device_t dev, u_char slave, char cmd, void *buf,
uint16_t buflen)
{
uint8_t local_buffer[ACPI_IICBUS_LOCAL_BUFSIZE];
struct iic_msg msgs[] = {
{ slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },
{ slave, IIC_M_RD, buflen, NULL },
};
int error;
if (buflen <= sizeof(local_buffer))
msgs[1].buf = local_buffer;
else
msgs[1].buf = malloc(buflen, M_DEVBUF, M_WAITOK);
error = iicbus_transfer(dev, msgs, nitems(msgs));
if (error == 0)
memcpy(buf, msgs[1].buf, buflen);
if (msgs[1].buf != local_buffer)
free(msgs[1].buf, M_DEVBUF);
return (error);
}
static int
acpi_iicbus_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
{
uint8_t bytes[2] = { cmd, count };
struct iic_msg msgs[] = {
{ slave, IIC_M_WR | IIC_M_NOSTOP, nitems(bytes), bytes },
{ slave, IIC_M_WR | IIC_M_NOSTART, count, buf },
};
if (count == 0)
return (errno2iic(EINVAL));
return (iicbus_transfer(dev, msgs, nitems(msgs)));
}
static int
acpi_iicbus_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)
{
uint8_t local_buffer[ACPI_IICBUS_LOCAL_BUFSIZE];
u_char len;
struct iic_msg msgs[] = {
{ slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },
{ slave, IIC_M_RD | IIC_M_NOSTOP, 1, &len },
};
struct iic_msg block_msg[] = {
{ slave, IIC_M_RD | IIC_M_NOSTART, 0, NULL },
};
device_t parent = device_get_parent(dev);
int error;
/* Have to do this because the command is split in two transfers. */
error = iicbus_request_bus(parent, dev, IIC_WAIT);
if (error == 0)
error = iicbus_transfer(dev, msgs, nitems(msgs));
if (error == 0) {
/*
* If the slave offers an empty reply,
* read one byte to generate the stop or abort.
*/
if (len == 0)
block_msg[0].len = 1;
else
block_msg[0].len = len;
if (len <= sizeof(local_buffer))
block_msg[0].buf = local_buffer;
else
block_msg[0].buf = malloc(len, M_DEVBUF, M_WAITOK);
error = iicbus_transfer(dev, block_msg, nitems(block_msg));
if (len == 0)
error = errno2iic(EBADMSG);
if (error == 0) {
*count = len;
memcpy(buf, block_msg[0].buf, len);
}
if (block_msg[0].buf != local_buffer)
free(block_msg[0].buf, M_DEVBUF);
}
(void)iicbus_release_bus(parent, dev);
return (error);
}
static ACPI_STATUS
acpi_iicbus_space_handler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address,
UINT32 BitWidth, UINT64 *Value, void *HandlerContext, void *RegionContext)
{
struct gsb_buffer *gsb;
struct acpi_iicbus_softc *sc;
device_t dev;
ACPI_CONNECTION_INFO *info;
ACPI_RESOURCE_I2C_SERIALBUS *sb;
ACPI_RESOURCE *res;
ACPI_STATUS s;
int val;
gsb = (struct gsb_buffer *)Value;
if (gsb == NULL)
return (AE_BAD_PARAMETER);
info = HandlerContext;
s = AcpiBufferToResource(info->Connection, info->Length, &res);
if (ACPI_FAILURE(s))
return (s);
if (!acpi_resource_is_i2c_serialbus(res)) {
s = AE_BAD_PARAMETER;
goto err;
}
sb = &res->Data.I2cSerialBus;
/* XXX Ignore 10bit addressing for now */
if (sb->AccessMode == ACPI_I2C_10BIT_MODE) {
s = AE_BAD_PARAMETER;
goto err;
}
#define AML_FIELD_ATTRIB_MASK 0x0F
#define AML_FIELD_ATTRIO(attr, io) (((attr) << 16) | (io))
Function &= AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_MASK, ACPI_IO_MASK);
sc = __containerof(info, struct acpi_iicbus_softc, space_handler_info);
dev = sc->super_sc.dev;
switch (Function) {
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_SEND_RECEIVE, ACPI_READ):
val = acpi_iicbus_recvb(dev, sb->SlaveAddress, gsb->data);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_SEND_RECEIVE, ACPI_WRITE):
val = acpi_iicbus_sendb(dev, sb->SlaveAddress, gsb->data[0]);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BYTE, ACPI_READ):
val = acpi_iicbus_read(dev, sb->SlaveAddress, Address,
gsb->data, 1);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BYTE, ACPI_WRITE):
val = acpi_iicbus_write(dev, sb->SlaveAddress, Address,
gsb->data, 1);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_WORD, ACPI_READ):
val = acpi_iicbus_read(dev, sb->SlaveAddress, Address,
gsb->data, 2);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_WORD, ACPI_WRITE):
val = acpi_iicbus_write(dev, sb->SlaveAddress, Address,
gsb->data, 2);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BLOCK, ACPI_READ):
val = acpi_iicbus_bread(dev, sb->SlaveAddress, Address,
&gsb->len, gsb->data);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BLOCK, ACPI_WRITE):
val = acpi_iicbus_bwrite(dev, sb->SlaveAddress, Address,
gsb->len, gsb->data);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BYTES, ACPI_READ):
val = acpi_iicbus_read(dev, sb->SlaveAddress, Address,
gsb->data, info->AccessLength);
break;
case AML_FIELD_ATTRIO(AML_FIELD_ATTRIB_BYTES, ACPI_WRITE):
val = acpi_iicbus_write(dev, sb->SlaveAddress, Address,
gsb->data, info->AccessLength);
break;
default:
device_printf(dev, "protocol(0x%04x) is not supported.\n",
Function);
s = AE_BAD_PARAMETER;
goto err;
}
gsb->status = val;
err:
ACPI_FREE(res);
return (s);
}
static int
acpi_iicbus_install_address_space_handler(struct acpi_iicbus_softc *sc)
{
ACPI_HANDLE handle;
ACPI_STATUS s;
handle = acpi_get_handle(device_get_parent(sc->super_sc.dev));
s = AcpiInstallAddressSpaceHandler(handle, ACPI_ADR_SPACE_GSBUS,
&acpi_iicbus_space_handler, NULL, &sc->space_handler_info);
if (ACPI_FAILURE(s)) {
device_printf(sc->super_sc.dev,
"Failed to install GSBUS Address Space Handler in ACPI\n");
return (ENXIO);
}
return (0);
}
static int
acpi_iicbus_remove_address_space_handler(struct acpi_iicbus_softc *sc)
{
ACPI_HANDLE handle;
ACPI_STATUS s;
handle = acpi_get_handle(device_get_parent(sc->super_sc.dev));
s = AcpiRemoveAddressSpaceHandler(handle, ACPI_ADR_SPACE_GSBUS,
&acpi_iicbus_space_handler);
if (ACPI_FAILURE(s)) {
device_printf(sc->super_sc.dev,
"Failed to remove GSBUS Address Space Handler from ACPI\n");
return (ENXIO);
}
return (0);
}
static ACPI_STATUS
acpi_iicbus_get_i2cres_cb(ACPI_RESOURCE *res, void *context)
{
ACPI_IICBUS_RESOURCE_I2C_SERIALBUS *sb = context;
ACPI_STATUS status;
ACPI_HANDLE handle;
if (acpi_resource_is_i2c_serialbus(res)) {
status = AcpiGetHandle(ACPI_ROOT_OBJECT,
res->Data.I2cSerialBus.ResourceSource.StringPtr, &handle);
if (ACPI_FAILURE(status))
return (status);
memcpy(sb, &res->Data.I2cSerialBus,
sizeof(ACPI_IICBUS_RESOURCE_I2C_SERIALBUS));
/*
* replace "pointer to ACPI object name string" field
* with pointer to ACPI object itself.
*/
sb->ResourceSource_Handle = handle;
return (AE_CTRL_TERMINATE);
} else if (res->Type == ACPI_RESOURCE_TYPE_END_TAG)
return (AE_NOT_FOUND);
return (AE_OK);
}
static ACPI_STATUS
acpi_iicbus_get_i2cres(ACPI_HANDLE handle, ACPI_RESOURCE_I2C_SERIALBUS *sb)
{
return (AcpiWalkResources(handle, "_CRS",
acpi_iicbus_get_i2cres_cb, sb));
}
static ACPI_STATUS
acpi_iicbus_parse_resources_cb(ACPI_RESOURCE *res, void *context)
{
device_t dev = context;
struct iicbus_ivar *super_devi = device_get_ivars(dev);
struct resource_list *rl = &super_devi->rl;
int irq, gpio_pin;
switch(res->Type) {
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
if (res->Data.ExtendedIrq.InterruptCount > 0) {
irq = res->Data.ExtendedIrq.Interrupts[0];
if (bootverbose)
printf(" IRQ: %d\n", irq);
resource_list_add_next(rl, SYS_RES_IRQ, irq, irq, 1);
return (AE_CTRL_TERMINATE);
}
break;
case ACPI_RESOURCE_TYPE_GPIO:
if (res->Data.Gpio.ConnectionType ==
ACPI_RESOURCE_GPIO_TYPE_INT) {
/* Not supported by FreeBSD yet */
gpio_pin = res->Data.Gpio.PinTable[0];
if (bootverbose)
printf(" GPIO IRQ pin: %d\n", gpio_pin);
return (AE_CTRL_TERMINATE);
}
break;
default:
break;
}
return (AE_OK);
}
static ACPI_STATUS
acpi_iicbus_parse_resources(ACPI_HANDLE handle, device_t dev)
{
return (AcpiWalkResources(handle, "_CRS",
acpi_iicbus_parse_resources_cb, dev));
}
static void
acpi_iicbus_dump_res(device_t dev, ACPI_IICBUS_RESOURCE_I2C_SERIALBUS *sb)
{
device_printf(dev, "found ACPI child\n");
printf(" SlaveAddress: 0x%04hx\n", sb->SlaveAddress);
printf(" ConnectionSpeed: %uHz\n", sb->ConnectionSpeed);
printf(" SlaveMode: %s\n",
sb->SlaveMode == ACPI_CONTROLLER_INITIATED ?
"ControllerInitiated" : "DeviceInitiated");
printf(" AddressingMode: %uBit\n", sb->AccessMode == 0 ? 7 : 10);
printf(" ConnectionSharing: %s\n", sb->ConnectionSharing == 0 ?
"Exclusive" : "Shared");
}
static device_t
acpi_iicbus_add_child(device_t dev, u_int order, const char *name, int unit)
{
return (iicbus_add_child_common(
dev, order, name, unit, sizeof(struct acpi_iicbus_ivars)));
}
static ACPI_STATUS
acpi_iicbus_enumerate_child(ACPI_HANDLE handle, UINT32 level,
void *context, void **result)
{
device_t iicbus, child, acpi_child, acpi0;
struct iicbus_softc *super_sc;
ACPI_IICBUS_RESOURCE_I2C_SERIALBUS sb;
ACPI_STATUS status;
UINT32 sta;
iicbus = context;
super_sc = device_get_softc(iicbus);
/*
* If no _STA method or if it failed, then assume that
* the device is present.
*/
if (!ACPI_FAILURE(acpi_GetInteger(handle, "_STA", &sta)) &&
!ACPI_DEVICE_PRESENT(sta))
return (AE_OK);
if (!acpi_has_hid(handle))
return (AE_OK);
/*
* Read "I2C Serial Bus Connection Resource Descriptor"
* described in p.19.6.57 of ACPI specification.
*/
bzero(&sb, sizeof(ACPI_IICBUS_RESOURCE_I2C_SERIALBUS));
if (ACPI_FAILURE(acpi_iicbus_get_i2cres(handle, &sb)) ||
sb.SlaveAddress == 0)
return (AE_OK);
if (sb.ResourceSource_Handle !=
acpi_get_handle(device_get_parent(iicbus)))
return (AE_OK);
if (bootverbose)
acpi_iicbus_dump_res(iicbus, &sb);
/* Find out speed of the slowest slave */
if (super_sc->bus_freq == 0 || super_sc->bus_freq > sb.ConnectionSpeed)
super_sc->bus_freq = sb.ConnectionSpeed;
/* Delete existing child of acpi bus */
acpi_child = acpi_get_device(handle);
if (acpi_child != NULL) {
acpi0 = devclass_get_device(devclass_find("acpi"), 0);
if (device_get_parent(acpi_child) != acpi0)
return (AE_OK);
if (device_is_attached(acpi_child))
return (AE_OK);
if (device_delete_child(acpi0, acpi_child) != 0)
return (AE_OK);
}
child = BUS_ADD_CHILD(iicbus, 0, NULL, -1);
if (child == NULL) {
device_printf(iicbus, "add child failed\n");
return (AE_OK);
}
iicbus_set_addr(child, sb.SlaveAddress);
acpi_set_handle(child, handle);
(void)acpi_iicbus_parse_resources(handle, child);
/*
* Update ACPI-CA to use the IIC enumerated device_t for this handle.
*/
status = AcpiAttachData(handle, acpi_fake_objhandler, child);
if (ACPI_FAILURE(status))
printf("WARNING: Unable to attach object data to %s - %s\n",
acpi_name(handle), AcpiFormatException(status));
return (AE_OK);
}
static ACPI_STATUS
acpi_iicbus_enumerate_children(device_t dev)
{
return (AcpiWalkNamespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, acpi_iicbus_enumerate_child, NULL, dev, NULL));
}
static void
acpi_iicbus_set_power_children(device_t dev, int state, bool all_children)
{
device_t *devlist;
int i, numdevs;
if (device_get_children(dev, &devlist, &numdevs) != 0)
return;
for (i = 0; i < numdevs; i++)
if (all_children || device_is_attached(devlist[i]) != 0)
acpi_set_powerstate(devlist[i], state);
free(devlist, M_TEMP);
}
static int
acpi_iicbus_probe(device_t dev)
{
ACPI_HANDLE handle;
device_t controller;
if (acpi_disabled("iicbus"))
return (ENXIO);
controller = device_get_parent(dev);
if (controller == NULL)
return (ENXIO);
handle = acpi_get_handle(controller);
if (handle == NULL)
return (ENXIO);
device_set_desc(dev, "Philips I2C bus (ACPI-hinted)");
return (BUS_PROBE_DEFAULT);
}
static int
acpi_iicbus_attach(device_t dev)
{
struct acpi_iicbus_softc *sc = device_get_softc(dev);
int error;
if (ACPI_FAILURE(acpi_iicbus_enumerate_children(dev)))
device_printf(dev, "children enumeration failed\n");
acpi_iicbus_set_power_children(dev, ACPI_STATE_D0, true);
error = iicbus_attach_common(dev, sc->super_sc.bus_freq);
if (error == 0 && install_space_handler != 0 &&
acpi_iicbus_install_address_space_handler(sc) == 0)
sc->space_handler_installed = true;
return (error);
}
static int
acpi_iicbus_detach(device_t dev)
{
struct acpi_iicbus_softc *sc = device_get_softc(dev);
if (sc->space_handler_installed)
acpi_iicbus_remove_address_space_handler(sc);
acpi_iicbus_set_power_children(dev, ACPI_STATE_D3, false);
return (iicbus_detach(dev));
}
static int
acpi_iicbus_suspend(device_t dev)
{
int error;
error = bus_generic_suspend(dev);
if (error == 0)
acpi_iicbus_set_power_children(dev, ACPI_STATE_D3, false);
return (error);
}
static int
acpi_iicbus_resume(device_t dev)
{
acpi_iicbus_set_power_children(dev, ACPI_STATE_D0, false);
return (bus_generic_resume(dev));
}
/*
* If this device is an ACPI child but no one claimed it, attempt
* to power it off. We'll power it back up when a driver is added.
*/
static void
acpi_iicbus_probe_nomatch(device_t bus, device_t child)
{
iicbus_probe_nomatch(bus, child);
acpi_set_powerstate(child, ACPI_STATE_D3);
}
/*
* If a new driver has a chance to probe a child, first power it up.
*/
static void
acpi_iicbus_driver_added(device_t dev, driver_t *driver)
{
device_t child, *devlist;
int i, numdevs;
DEVICE_IDENTIFY(driver, dev);
if (device_get_children(dev, &devlist, &numdevs) != 0)
return;
for (i = 0; i < numdevs; i++) {
child = devlist[i];
if (device_get_state(child) == DS_NOTPRESENT) {
acpi_set_powerstate(child, ACPI_STATE_D0);
if (device_probe_and_attach(child) != 0)
acpi_set_powerstate(child, ACPI_STATE_D3);
}
}
free(devlist, M_TEMP);
}
static void
acpi_iicbus_child_deleted(device_t bus, device_t child)
{
struct acpi_iicbus_ivars *devi = device_get_ivars(child);
if (acpi_get_device(devi->handle) == child)
AcpiDetachData(devi->handle, acpi_fake_objhandler);
}
static int
acpi_iicbus_read_ivar(device_t bus, device_t child, int which, uintptr_t *res)
{
struct acpi_iicbus_ivars *devi = device_get_ivars(child);
switch (which) {
case ACPI_IVAR_HANDLE:
*res = (uintptr_t)devi->handle;
break;
default:
return (iicbus_read_ivar(bus, child, which, res));
}
return (0);
}
static int
acpi_iicbus_write_ivar(device_t bus, device_t child, int which, uintptr_t val)
{
struct acpi_iicbus_ivars *devi = device_get_ivars(child);
switch (which) {
case ACPI_IVAR_HANDLE:
if (devi->handle != NULL)
return (EINVAL);
devi->handle = (ACPI_HANDLE)val;
break;
default:
return (iicbus_write_ivar(bus, child, which, val));
}
return (0);
}
/* Location hint for devctl(8). Concatenate IIC and ACPI hints. */
static int
acpi_iicbus_child_location_str(device_t bus, device_t child,
char *buf, size_t buflen)
{
struct acpi_iicbus_ivars *devi = device_get_ivars(child);
int error;
/* read IIC location hint string into the buffer. */
error = iicbus_child_location_str(bus, child, buf, buflen);
if (error != 0)
return (error);
/* Place ACPI string right after IIC one's terminating NUL. */
if (devi->handle != NULL &&
((buf[0] != '\0' && strlcat(buf, " ", buflen) >= buflen) ||
strlcat(buf, "handle=", buflen) >= buflen ||
strlcat(buf, acpi_name(devi->handle), buflen) >= buflen))
return (EOVERFLOW);
return (0);
}
/* PnP information for devctl(8). Concatenate IIC and ACPI info strings. */
static int
acpi_iicbus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
size_t buflen)
{
struct acpi_iicbus_ivars *devi = device_get_ivars(child);
size_t acpi_offset;
int error;
/* read IIC PnP string into the buffer. */
error = iicbus_child_pnpinfo_str(bus, child, buf, buflen);
if (error != 0)
return (error);
if (devi->handle == NULL)
return (0);
/* Place ACPI string right after IIC one's terminating NUL. */
acpi_offset = strlen(buf);
if (acpi_offset != 0)
acpi_offset++;
error = acpi_pnpinfo_str(devi->handle, buf + acpi_offset,
buflen - acpi_offset);
/* Coalesce both strings if they are not empty. */
if (acpi_offset > 0 && acpi_offset < buflen && buf[acpi_offset] != 0)
buf[acpi_offset - 1] = ' ';
return (error);
}
static device_method_t acpi_iicbus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, acpi_iicbus_probe),
DEVMETHOD(device_attach, acpi_iicbus_attach),
DEVMETHOD(device_detach, acpi_iicbus_detach),
DEVMETHOD(device_suspend, acpi_iicbus_suspend),
DEVMETHOD(device_resume, acpi_iicbus_resume),
/* Bus interface */
DEVMETHOD(bus_add_child, acpi_iicbus_add_child),
DEVMETHOD(bus_probe_nomatch, acpi_iicbus_probe_nomatch),
DEVMETHOD(bus_driver_added, acpi_iicbus_driver_added),
DEVMETHOD(bus_child_deleted, acpi_iicbus_child_deleted),
DEVMETHOD(bus_read_ivar, acpi_iicbus_read_ivar),
DEVMETHOD(bus_write_ivar, acpi_iicbus_write_ivar),
DEVMETHOD(bus_child_location_str,acpi_iicbus_child_location_str),
DEVMETHOD(bus_child_pnpinfo_str,acpi_iicbus_child_pnpinfo_str),
DEVMETHOD_END,
};
DEFINE_CLASS_1(iicbus, acpi_iicbus_driver, acpi_iicbus_methods,
sizeof(struct acpi_iicbus_softc), iicbus_driver);
MODULE_VERSION(acpi_iicbus, 1);
MODULE_DEPEND(acpi_iicbus, acpi, 1, 1, 1);
