1 /*- 2 * Copyright (c) 2016 The FreeBSD Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 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 13 * the documentation and/or other materials provided with the 14 * distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 20 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 #include <sys/errno.h> 38 #include <sys/bus.h> 39 40 #include <dev/pci/pcivar.h> 41 #include <dev/pci/pcireg.h> 42 #include <dev/iicbus/iicbus.h> 43 #include <dev/iicbus/iiconf.h> 44 45 /* 46 * Driver that attaches I2C devices. 47 */ 48 static struct { 49 uint32_t pci_id; 50 const char *name; 51 uint8_t addr; 52 } slaves[] = { 53 { 0x9c628086, "isl", 0x88 }, 54 { 0x9c618086, "cyapa", 0xce }, 55 }; 56 57 static void 58 chromebook_i2c_identify(driver_t *driver, device_t bus) 59 { 60 device_t controller; 61 device_t child; 62 int i; 63 64 /* 65 * A stopgap approach to preserve the status quo. 66 * A more intelligent approach is required to correctly 67 * identify a machine model and hardware available on it. 68 * For instance, DMI could be used. 69 * See http://lxr.free-electrons.com/source/drivers/platform/chrome/chromeos_laptop.c 70 */ 71 controller = device_get_parent(bus); 72 if (strcmp(device_get_name(controller), "ig4iic_pci") != 0) 73 return; 74 75 for (i = 0; i < nitems(slaves); i++) { 76 if (device_find_child(bus, slaves[i].name, -1) != NULL) 77 continue; 78 if (slaves[i].pci_id != pci_get_devid(controller)) 79 continue; 80 child = BUS_ADD_CHILD(bus, 0, slaves[i].name, -1); 81 if (child != NULL) 82 iicbus_set_addr(child, slaves[i].addr); 83 } 84 } 85 86 static device_method_t chromebook_i2c_methods[] = { 87 DEVMETHOD(device_identify, chromebook_i2c_identify), 88 { 0, 0 } 89 }; 90 91 static driver_t chromebook_i2c_driver = { 92 "chromebook_i2c", 93 chromebook_i2c_methods, 94 0 /* no softc */ 95 }; 96 97 static devclass_t chromebook_i2c_devclass; 98 99 DRIVER_MODULE(chromebook_i2c, iicbus, chromebook_i2c_driver, 100 chromebook_i2c_devclass, 0, 0); 101 MODULE_VERSION(chromebook_i2c, 1); 102 103