984ed3e493
They share common device driver code with different bus attachments This commit starts a bunch of changes which have following properties: Reviewed by: imp (previous version) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D22016
103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
/*-
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* Copyright (c) 2016 The FreeBSD Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/errno.h>
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#include <sys/bus.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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/*
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* Driver that attaches I2C devices.
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*/
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static struct {
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uint32_t pci_id;
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const char *name;
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uint8_t addr;
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} slaves[] = {
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{ 0x9c628086, "isl", 0x88 },
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{ 0x9c618086, "cyapa", 0xce },
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};
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static void
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chromebook_i2c_identify(driver_t *driver, device_t bus)
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{
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device_t controller;
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device_t child;
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int i;
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/*
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* A stopgap approach to preserve the status quo.
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* A more intelligent approach is required to correctly
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* identify a machine model and hardware available on it.
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* For instance, DMI could be used.
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* See http://lxr.free-electrons.com/source/drivers/platform/chrome/chromeos_laptop.c
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*/
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controller = device_get_parent(bus);
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if (strcmp(device_get_name(controller), "ig4iic") != 0)
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return;
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for (i = 0; i < nitems(slaves); i++) {
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if (device_find_child(bus, slaves[i].name, -1) != NULL)
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continue;
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if (slaves[i].pci_id != pci_get_devid(controller))
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continue;
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child = BUS_ADD_CHILD(bus, 0, slaves[i].name, -1);
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if (child != NULL)
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iicbus_set_addr(child, slaves[i].addr);
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}
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}
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static device_method_t chromebook_i2c_methods[] = {
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DEVMETHOD(device_identify, chromebook_i2c_identify),
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{ 0, 0 }
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};
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static driver_t chromebook_i2c_driver = {
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"chromebook_i2c",
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chromebook_i2c_methods,
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0 /* no softc */
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};
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static devclass_t chromebook_i2c_devclass;
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DRIVER_MODULE(chromebook_i2c, iicbus, chromebook_i2c_driver,
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chromebook_i2c_devclass, 0, 0);
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MODULE_VERSION(chromebook_i2c, 1);
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