Date: Mon, 10 Oct 2016 14:35:22 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Warner Losh <imp@bsdimp.com>, Matthias Apitz <guru@unixarea.de>, Michael Gmelin <grembo@FreeBSD.org>, FreeBSD Current <freebsd-current@FreeBSD.org> Subject: Re: [request for testing] isl, cyapa on chromebooks Message-ID: <23c6b4f0-77e9-fe90-0eed-9d0125e7624b@FreeBSD.org> In-Reply-To: <CANCZdfrSgKv7Gs6hjd8MOH1cb9UyFcMuJQUkUkMvKxtuUYawRA@mail.gmail.com> References: <53bca4d2-975f-f4a0-d12a-5d73fba01a0c@FreeBSD.org> <20161006044732.GA2393@c720-r292778-amd64.oa.oclc.org> <734c7ac0-9018-051e-1df4-a3b719057e19@FreeBSD.org> <773efe54-8ebb-e0e7-7824-10cfaa96d850@FreeBSD.org> <1EE0A2F3-86B9-4806-875E-3845A209A743@freebsd.org> <d4501bd4-7b53-0fb7-ab89-f721368f3f04@FreeBSD.org> <20161008180742.GA1912@c720-r292778-amd64> <846bf31f-a757-2be0-a293-8c4ce3d42a2f@FreeBSD.org> <CANCZdfrYhczHJHR3Kq8GSFx5c_6hcrK=1HU12PXcVB-WAo-8QA@mail.gmail.com> <20161009015324.007a7b42@bsd64.grem.de> <20161009065423.GA2012@c720-r292778-amd64> <CANCZdfrSgKv7Gs6hjd8MOH1cb9UyFcMuJQUkUkMvKxtuUYawRA@mail.gmail.com>
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On 09/10/2016 23:22, Warner Losh wrote: > There seems to be enough information present in the smbios data to > know what devices are at what addresses. Perhaps we should use it as > much as possible in well controlled situations to move this knowledge > into the OS. So, I was thinking about maybe doing something like this to preserve the status quo, to avoid requiring manual hints and to lay a foundation for the proper Chromebook I2C slave discovery: static struct { uint32_t ctlrid, const char *name; uint_t addr; } slaves[] = { { 0x9c628086, "isl", 0x88 }, { 0x9c628086, "cyapa", 0xce }, } static void chromebook_i2c_identify(driver_t *driver, device_t bus) { device_t controller; device_t child; int i; /* * A stop gap approach to preserve the status quo. * A more intelligent approach is required to correctly * identify a machine model and hadrdware 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, slave->name, -1) != NULL) continue; if (slave->ctlrid != pci_get_devid(controller)) continue; child = BUS_ADD_CHILD(bus, 0, slave->name, -1); if (child != NULL) iicbus_set_addr(child, slave->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_DEPEND(chromebook_i2c, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); MODULE_VERSION(chromebook_i2c, 1); The idea is that this is a driver that listens for new iicbus-es and adds isl and cyapa devices to a bus if some criteria are met. -- Andriy Gapon
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