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chromebook_platform.c
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Editing: chromebook_platform.c
/*- * Copyright (c) 2016 The FreeBSD Project. * All rights reserved. * * 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 COPYRIGHT HOLDERS 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 * COPYRIGHT HOLDERS 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/systm.h> #include <sys/kernel.h> #include <sys/module.h> #include <sys/errno.h> #include <sys/bus.h> #include <dev/pci/pcivar.h> #include <dev/pci/pcireg.h> #include <dev/iicbus/iicbus.h> #include <dev/iicbus/iiconf.h> /* * Driver that attaches I2C devices. */ static struct { uint32_t pci_id; const char *name; uint8_t addr; } slaves[] = { { 0x9c628086, "isl", 0x88 }, { 0x9c618086, "cyapa", 0xce }, }; static void chromebook_i2c_identify(driver_t *driver, device_t bus) { device_t controller; device_t child; int i; /* * A stopgap approach to preserve the status quo. * A more intelligent approach is required to correctly * identify a machine model and hardware available on it. * For instance, DMI could be used. * See http://lxr.free-electrons.com/source/drivers/platform/chrome/chromeos_laptop.c */ controller = device_get_parent(bus); if (strcmp(device_get_name(controller), "ig4iic") != 0) return; for (i = 0; i < nitems(slaves); i++) { if (device_find_child(bus, slaves[i].name, -1) != NULL) continue; if (slaves[i].pci_id != pci_get_devid(controller)) continue; child = BUS_ADD_CHILD(bus, 0, slaves[i].name, -1); if (child != NULL) iicbus_set_addr(child, slaves[i].addr); } } static device_method_t chromebook_i2c_methods[] = { DEVMETHOD(device_identify, chromebook_i2c_identify), { 0, 0 } }; static driver_t chromebook_i2c_driver = { "chromebook_i2c", chromebook_i2c_methods, 0 /* no softc */ }; static devclass_t chromebook_i2c_devclass; DRIVER_MODULE(chromebook_i2c, iicbus, chromebook_i2c_driver, chromebook_i2c_devclass, 0, 0); MODULE_VERSION(chromebook_i2c, 1);
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