chromebook_platform.c

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    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") != 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 DRIVER_MODULE(chromebook_i2c, iicbus, chromebook_i2c_driver, 0, 0);
   98 MODULE_VERSION(chromebook_i2c, 1);
   99

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FreeBSD/Linux Kernel Cross Reference sys/dev/chromebook_platform/chromebook_platform.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/chromebook_platform/chromebook_platform.c