1308104Savg/*- 2308104Savg * Copyright (c) 2016 The FreeBSD Project. 3308104Savg * All rights reserved. 4308104Savg * 5308104Savg * Redistribution and use in source and binary forms, with or without 6308104Savg * modification, are permitted provided that the following conditions 7308104Savg * are met: 8308104Savg * 9308104Savg * 1. Redistributions of source code must retain the above copyright 10308104Savg * notice, this list of conditions and the following disclaimer. 11308104Savg * 2. Redistributions in binary form must reproduce the above copyright 12308104Savg * notice, this list of conditions and the following disclaimer in 13308104Savg * the documentation and/or other materials provided with the 14308104Savg * distribution. 15308104Savg * 16308104Savg * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17308104Savg * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18308104Savg * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 19308104Savg * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 20308104Savg * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 21308104Savg * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 22308104Savg * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23308104Savg * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24308104Savg * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25308104Savg * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26308104Savg * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27308104Savg * SUCH DAMAGE. 28308104Savg */ 29308104Savg 30308104Savg#include <sys/cdefs.h> 31308104Savg__FBSDID("$FreeBSD: stable/11/sys/dev/chromebook_platform/chromebook_platform.c 314551 2017-03-02 10:43:42Z avg $"); 32308104Savg 33308104Savg#include <sys/param.h> 34308104Savg#include <sys/systm.h> 35308104Savg#include <sys/kernel.h> 36308104Savg#include <sys/module.h> 37308104Savg#include <sys/errno.h> 38308104Savg#include <sys/bus.h> 39308104Savg 40308104Savg#include <dev/pci/pcivar.h> 41308104Savg#include <dev/pci/pcireg.h> 42308104Savg#include <dev/iicbus/iicbus.h> 43308104Savg#include <dev/iicbus/iiconf.h> 44308104Savg 45308104Savg/* 46308104Savg * Driver that attaches I2C devices. 47308104Savg */ 48308104Savgstatic struct { 49308104Savg uint32_t pci_id; 50308104Savg const char *name; 51308104Savg uint8_t addr; 52308104Savg} slaves[] = { 53308104Savg { 0x9c628086, "isl", 0x88 }, 54308104Savg { 0x9c618086, "cyapa", 0xce }, 55308104Savg}; 56308104Savg 57308104Savgstatic void 58308104Savgchromebook_i2c_identify(driver_t *driver, device_t bus) 59308104Savg{ 60308104Savg device_t controller; 61308104Savg device_t child; 62308104Savg int i; 63308104Savg 64308104Savg /* 65308104Savg * A stopgap approach to preserve the status quo. 66308104Savg * A more intelligent approach is required to correctly 67308104Savg * identify a machine model and hardware available on it. 68308104Savg * For instance, DMI could be used. 69308104Savg * See http://lxr.free-electrons.com/source/drivers/platform/chrome/chromeos_laptop.c 70308104Savg */ 71308104Savg controller = device_get_parent(bus); 72314551Savg if (strcmp(device_get_name(controller), "ig4iic_pci") != 0) 73308104Savg return; 74308104Savg 75308104Savg for (i = 0; i < nitems(slaves); i++) { 76308104Savg if (device_find_child(bus, slaves[i].name, -1) != NULL) 77308104Savg continue; 78308104Savg if (slaves[i].pci_id != pci_get_devid(controller)) 79308104Savg continue; 80308104Savg child = BUS_ADD_CHILD(bus, 0, slaves[i].name, -1); 81308104Savg if (child != NULL) 82308104Savg iicbus_set_addr(child, slaves[i].addr); 83308104Savg } 84308104Savg} 85308104Savg 86308104Savgstatic device_method_t chromebook_i2c_methods[] = { 87308104Savg DEVMETHOD(device_identify, chromebook_i2c_identify), 88308104Savg { 0, 0 } 89308104Savg}; 90308104Savg 91308104Savgstatic driver_t chromebook_i2c_driver = { 92308104Savg "chromebook_i2c", 93308104Savg chromebook_i2c_methods, 94308104Savg 0 /* no softc */ 95308104Savg}; 96308104Savg 97308104Savgstatic devclass_t chromebook_i2c_devclass; 98308104Savg 99308104SavgDRIVER_MODULE(chromebook_i2c, iicbus, chromebook_i2c_driver, 100308104Savg chromebook_i2c_devclass, 0, 0); 101308104SavgMODULE_VERSION(chromebook_i2c, 1); 102308104Savg 103