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/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/errno.h> 35 #include <sys/bus.h> 36 37 #include <dev/pci/pcivar.h> 38 #include <dev/pci/pcireg.h> 39 #include <dev/iicbus/iicbus.h> 40 #include <dev/iicbus/iiconf.h> 41 42 /* 43 * Driver that attaches I2C devices. 44 */ 45 static struct { 46 uint32_t pci_id; 47 const char *name; 48 uint8_t addr; 49 } slaves[] = { 50 { 0x9c628086, "isl", 0x88 }, 51 { 0x9c618086, "cyapa", 0xce }, 52 }; 53 54 static void 55 chromebook_i2c_identify(driver_t *driver, device_t bus) 56 { 57 device_t controller; 58 device_t child; 59 int i; 60 61 /* 62 * A stopgap approach to preserve the status quo. 63 * A more intelligent approach is required to correctly 64 * identify a machine model and hardware available on it. 65 * For instance, DMI could be used. 66 * See http://lxr.free-electrons.com/source/drivers/platform/chrome/chromeos_laptop.c 67 */ 68 controller = device_get_parent(bus); 69 if (strcmp(device_get_name(controller), "ig4iic") != 0) 70 return; 71 72 for (i = 0; i < nitems(slaves); i++) { 73 if (device_find_child(bus, slaves[i].name, -1) != NULL) 74 continue; 75 if (slaves[i].pci_id != pci_get_devid(controller)) 76 continue; 77 child = BUS_ADD_CHILD(bus, 0, slaves[i].name, -1); 78 if (child != NULL) 79 iicbus_set_addr(child, slaves[i].addr); 80 } 81 } 82 83 static device_method_t chromebook_i2c_methods[] = { 84 DEVMETHOD(device_identify, chromebook_i2c_identify), 85 { 0, 0 } 86 }; 87 88 static driver_t chromebook_i2c_driver = { 89 "chromebook_i2c", 90 chromebook_i2c_methods, 91 0 /* no softc */ 92 }; 93 94 DRIVER_MODULE(chromebook_i2c, iicbus, chromebook_i2c_driver, 0, 0); 95 MODULE_VERSION(chromebook_i2c, 1); 96 97