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Date: Thu, 27 Nov 2008 19:05:17 +0000
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: linux-acpi@vger.kernel.org
Cc: bri@abrij.org, linux-kernel@vger.kernel.org, greg@kroah.com
Subject: [PATCH] misc: Add oqo-wmi driver for model 2 OQO backlight and rfkill control
Message-ID: <20081127190517.GA25429@srcf.ucam.org>
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misc: Add oqo-wmi driver for model 2 OQO backlight and rfkill control
    
oqo-wmi provides a WMI-based interface to backlight and rfkill control on
model 2 OQO devices. It was originally written by Brian Julin
(<bri@abrij.org>) - I've ported it to the rfkill layer and tidied it up a
little.
    
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 3949a1c..b7af402 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -237,6 +237,19 @@ config ICS932S401
 	  This driver can also be built as a module. If so, the module
 	  will be called ics932s401.
 
+config OQO_WMI
+       tristate "OQO WMI extras"
+       depends on ACPI_WMI
+       depends on INPUT
+       depends on RFKILL
+       depends on BACKLIGHT_CLASS_DEVICE
+       help
+         Say Y here if you want to support rfkill and backlight control on
+         series 2 OQO handheld devices.
+
+         To compile this driver as a module, choose M here: the module will
+         be called oqo-wmi.
+
 config MSI_LAPTOP
         tristate "MSI Laptop Extras"
         depends on X86
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 39043f8..1109062 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_ATMEL_TCLIB)	+= atmel_tclib.o
 obj-$(CONFIG_HP_WMI)		+= hp-wmi.o
 obj-$(CONFIG_ICS932S401)	+= ics932s401.o
 obj-$(CONFIG_TC1100_WMI)	+= tc1100-wmi.o
+obj-$(CONFIG_OQO_WMI)		+= oqo-wmi.o
 obj-$(CONFIG_LKDTM)		+= lkdtm.o
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
diff --git a/drivers/misc/oqo-wmi.c b/drivers/misc/oqo-wmi.c
new file mode 100644
index 0000000..940e605
--- /dev/null
+++ b/drivers/misc/oqo-wmi.c
@@ -0,0 +1,941 @@
+/*
+ *  OQO WMI UPMC Extras
+ *
+ *  Copyright (C) 2008 Brian S. Julin <bri@abrij.org>
+ *
+ *  Based on acer-wmi:
+ *    Copyright (C) 2007-2008	Carlos Corbacho <cathectic@gmail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * NOTE: You need to turn SMI on in BIOS (if dmidecode works, you already have)
+ * NOTE: acpi-wmi support mandatory
+ * NOTE: backlight and inputdev support a must, ifdefs will come later
+ */
+
+/*
+ *
+ *  0.3: added WLAN enable switch, restore settings on unload,
+ *       resume/suspend handling
+ *  0.2: Still not production-ready, but added ambient light sensor,
+ *       backlight, and it prints the unit serial number to dmesg (do
+ *       not know where to make that available to userspace yet.)
+ *  0.1: This is a first cut.  Plan to reboot after playing with this.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/dmi.h>
+#include <linux/backlight.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+#include <linux/i8042.h>
+#include <linux/input-polldev.h>
+#include <linux/rfkill.h>
+
+#include <acpi/acpi_drivers.h>
+
+MODULE_AUTHOR("Brian Julin");
+MODULE_DESCRIPTION("OQO UPMC WMI Extras Driver");
+MODULE_LICENSE("GPL");
+
+#define OQO_LOGPREFIX "oqo-wmi: "
+#define OQO_ERR KERN_ERR OQO_LOGPREFIX
+#define OQO_NOTICE KERN_NOTICE OQO_LOGPREFIX
+#define OQO_INFO KERN_INFO OQO_LOGPREFIX
+
+#define OQO_KINE_MAXTRY 3
+
+/* Store defined devices globally since we only have one instance. */
+static struct platform_device *oqo_platform_device;
+static struct backlight_device *oqo_backlight_device;
+static struct rfkill *oqo_rfkill;
+static struct input_dev *oqo_kine;
+static struct input_polled_dev *oqo_kine_polled;
+
+/* Likewise store current and original settings globally. */
+struct oqo_settings {
+	int lid_wakes;		/* not sure if ACPI handles/needs help here */
+	int kine_itvl;
+	int bl_bright;
+};
+
+static struct oqo_settings orig, curr;
+
+/* Some of this code is left like in acer-wmi so we can add the older
+   Model 01 and any future models more easily, but we should not expect
+   it to be as complicated as Acer given each model is a leap rather than
+   a subtle variant on the last, so we aren't using "quirks" perse.  Not
+   sure if there is any real difference for our purposes between the o2
+   and e2.
+*/
+struct oqo_model {
+	const char *model;
+	u16 model_subs;
+};
+#define MODEL_SUB_OQO_O2_SMB0 3
+
+static struct oqo_model oqo_models[] = {
+	{
+	 .model = "Model 2",
+	 .model_subs = MODEL_SUB_OQO_O2_SMB0,
+	 },
+	{}
+};
+
+static struct oqo_model *model;
+
+static int force;
+module_param(force, bool, 0644);
+MODULE_PARM_DESC(force, "Force WMI detection even if DMI detection failed");
+
+/*
+ * OQO Model 2 SMBUS registers
+ * We are just using WMI to read the Cx700 smbus, to share the
+ * ACPI mutex (what may also eventually work in VMs/win32)
+ * Using i2c-viapro directly could interfere with PM.
+ */
+
+#define OQO_O2_SMB0_WWAN_DSBL_ADDR	0x19
+#define OQO_O2_SMB0_WWAN_DSBL_MASK	0x02
+#define OQO_O2_SMB0_LUMIN_LO		0x20
+#define OQO_O2_SMB0_LUMIN_HI		0x21
+#define OQO_O2_SMB0_BL_LO		0x26
+#define OQO_O2_SMB0_BL_HI		0x27
+#define OQO_O2_SMB0_ACCEL_POLL_ITVL	0x45
+#define OQO_O2_SMB0_ACCEL_XLO		0x50
+#define OQO_O2_SMB0_ACCEL_XHI		0x51
+#define OQO_O2_SMB0_ACCEL_YLO		0x52
+#define OQO_O2_SMB0_ACCEL_YHI		0x53
+#define OQO_O2_SMB0_ACCEL_ZLO		0x54
+#define OQO_O2_SMB0_ACCEL_ZHI		0x55
+/* These may be handled by ACPI not sure yet. */
+#define OQO_O2_SMB0_LID_WAKES_ADDR	0x58
+#define OQO_O2_SMB0_LID_WAKES_MASK	0x08
+
+#define OQO_O2_SMB0_SERIAL_START	0x70
+#define OQO_O2_SMB0_SERIAL_LEN		11
+
+static char oqo_sn[OQO_O2_SMB0_SERIAL_LEN + 1];
+
+/* Other addresses I have noticed used on the 02 SMBUS (from DSDT and whatnot)
+ *
+ * These are not used because the linux ACPI drivers work fine on them
+ *
+ * 0x0A -- processor sleep mode?
+ * 0x0C -- ACPI events, probably clears when read.
+ * 0x30 -- thermal zone
+ *      There is something going on at 0x31 through 0x34 which is likely
+ *      also thermal.  The values change over time.  Have not figured that
+ *      out yet.
+ * 0x41 -- AC detect
+ * 0x42 -- LID button   ACTUALLY THIS DOES NOT WORK AND NEEDS TO BE FIXED
+ * 0xa0 and 0xa1 -- battery something (presence? state?)
+ * 0xa4 to 0xcf -- battery info (0xc8-0xca contains "OQO")
+ * 0xd4 to 0xef -- other battery stats
+ */
+
+/*
+ * OQO method GUIDs
+ */
+#define OQO_O2_AMW0_GUID "ABBC0F6D-8EA1-11D1-00A0-C90629100000"
+MODULE_ALIAS("wmi:ABBC0F6D-8EA1-11D1-00A0-C90629100000");
+
+/*
+ * Interface type flags
+ */
+enum interface_type {
+	OQO_O2_AMW0,
+};
+
+/* Each low-level interface must define at least some of the following */
+struct wmi_interface {
+	/* The WMI device type */
+	u32 type;
+};
+
+static struct wmi_interface AMW0_interface = {
+	.type = OQO_O2_AMW0,
+};
+
+/* The detected/chosen interface */
+static struct wmi_interface *interface;
+
+static int dmi_matched(const struct dmi_system_id *dmi)
+{
+	model = dmi->driver_data;
+	/*
+	 * Detect which ACPI-WMI interface we're using.
+	 */
+	if (wmi_has_guid(OQO_O2_AMW0_GUID))
+		interface = &AMW0_interface;
+
+	return 0;
+}
+
+static struct dmi_system_id oqo_dmis[] = {
+	{
+	 .callback = dmi_matched,
+	 .ident = "OQO 02",
+	 .matches = {
+		     DMI_MATCH(DMI_SYS_VENDOR, "OQO Inc."),
+		     DMI_MATCH(DMI_PRODUCT_NAME, "OQO Model 2"),
+		     },
+	 .driver_data = oqo_models + 0,
+	 },
+	{}
+};
+
+/*
+ * AMW0 (V1) interface on OQO Model 2
+ *
+ * wmba: has four functions selected by int arg 1.  arg2 is 3 byte buffer.
+ *       1: performs GETB method on the SMBUS using bytes 0, 1 of Arg2
+ *          returns a buffer object containing a single byte
+ *       2: performs SETB on SMBUS using bytes 0, 1, 2 of Arg2
+ *          returns 0 as int.
+ *       3: dumps 256 values into a given SMBUS register (not used here)
+ *          returns 0 as int.
+ *       4: puts byte 0 of arg2 into some sort of busy flag.  Some ACPI
+ *          funcs check this (==0) to decide if SMBUS operations are safe.
+ *          returns 0 as int.
+ * wmbb: simply returns the busy flag set by wmba #4
+ */
+static acpi_status oqo_smbus_getb(u8 addr, u8 *result)
+{
+	struct acpi_buffer input, res;
+	acpi_status status;
+	union acpi_object *obj;
+	u32 arg2;
+
+	input.length = 4;
+	input.pointer = &arg2;
+	res.length = ACPI_ALLOCATE_BUFFER;
+	res.pointer = NULL;
+
+	arg2 = addr;
+	arg2 <<= 8;
+	arg2 |= 0x12;		/* HOSTCMD */
+
+	status = wmi_evaluate_method(OQO_O2_AMW0_GUID, 1, 1, &input, &res);
+
+	if (status != AE_OK)
+		return status;
+
+	obj = (union acpi_object *)res.pointer;
+	if (!obj)
+		return AE_NULL_OBJECT;
+
+	if (obj->type != ACPI_TYPE_BUFFER
+	    || obj->buffer.length != 1 || obj->buffer.pointer == NULL) {
+		kfree(obj);
+		return AE_TYPE;
+	}
+	*result = ((u8 *) (obj->buffer.pointer))[0];
+	kfree(obj);
+	return status;
+}
+
+static acpi_status oqo_smbus_setb(u8 addr, u8 val)
+{
+	struct acpi_buffer input, res;
+	acpi_status status;
+	union acpi_object *obj;
+	u32 arg2;
+
+	input.length = 4;
+	input.pointer = &arg2;
+	res.length = ACPI_ALLOCATE_BUFFER;
+	res.pointer = NULL;
+
+	arg2 = val;
+	arg2 <<= 8;
+	arg2 |= addr;
+	arg2 <<= 8;
+	arg2 |= 0x12;		/* HOSTCMD */
+
+	status = wmi_evaluate_method(OQO_O2_AMW0_GUID, 1, 2, &input, &res);
+
+	if (status != AE_OK)
+		return status;
+
+	obj = (union acpi_object *)res.pointer;
+	if (!obj)
+		return AE_NULL_OBJECT;
+
+	if (obj->type != ACPI_TYPE_INTEGER) {
+		kfree(obj);
+		return AE_TYPE;
+	}
+	kfree(obj);
+	return status;
+}
+
+/*
+ * We assume we are the only one using this ...ahem... "lock" on
+ * the SMBUS because it would be pathetically noneffective otherwise.
+ *
+ * Nonzero silly_lock will keep certain ACPI routines away from the
+ * SMBUS (if they aren't already on it when you call it.)  Zero
+ *  silly_lock will let them back on
+ *
+ * This is probably useful before sleeping the system, and one
+ * waits until any ACPI funcs would have long finished before
+ * proceeding.  It seems harmless enough and will work to wrap
+ * more accesses with it.
+ */
+static acpi_status oqo_lock_smbus(int silly_lock)
+{
+	struct acpi_buffer input, res;
+	acpi_status status;
+	union acpi_object *obj;
+	u32 arg2;
+
+	input.length = 4;
+	input.pointer = &arg2;
+	res.length = ACPI_ALLOCATE_BUFFER;
+	res.pointer = NULL;
+
+	arg2 = !!silly_lock;
+
+	status = wmi_evaluate_method(OQO_O2_AMW0_GUID, 1, 4, &input, &res);
+
+	if (status != AE_OK)
+		return status;
+
+	obj = (union acpi_object *)res.pointer;
+	if (!obj)
+		return AE_NULL_OBJECT;
+
+	if (obj->type != ACPI_TYPE_INTEGER) {
+		kfree(obj);
+		return AE_TYPE;
+	}
+	kfree(obj);
+	return status;
+}
+
+static int smread_s16(u8 hi_addr, u8 lo_addr)
+{
+	s16 ret = -1;
+	acpi_status status;
+	u8 r;
+
+	/* Keep some ACPI routines off the SMBUS */
+	status = oqo_lock_smbus(1);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	status = oqo_smbus_getb(hi_addr, &r);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	ret = r;
+	ret <<= 8;
+
+	status = oqo_smbus_getb(lo_addr, &r);
+	if (ACPI_FAILURE(status)) {
+		ret = -1;
+		goto skip;
+	}
+
+	ret |= r;
+	ret &= 0x7fff;
+skip:
+	/* Let ACPI routines back on the SMBUS */
+	status = oqo_lock_smbus(0);
+	if (ACPI_FAILURE(status))
+		return -1;
+	return (int)ret;
+}
+
+static int smwrite_s16(u8 hi_addr, u8 lo_addr, s16 val)
+{
+	acpi_status status;
+	u8 r;
+	int ret = -1;
+
+	status = oqo_lock_smbus(1);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	r = (val >> 8) & 0x7f;
+	status = oqo_smbus_setb(hi_addr, r);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	r = val & 0xff;
+	status = oqo_smbus_setb(lo_addr, r);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	ret = 0;
+skip:
+	status = oqo_lock_smbus(0);
+	if (ACPI_FAILURE(status))
+		return -1;
+	return ret;
+}
+
+static int smread_u8(u8 addr)
+{
+	int ret = -1;
+	acpi_status status;
+	u8 r;
+
+	status = oqo_lock_smbus(1);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	status = oqo_smbus_getb(addr, &r);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	ret = r;
+skip:
+	status = oqo_lock_smbus(0);
+	if (ACPI_FAILURE(status))
+		return -1;
+	return (int)ret;
+}
+
+static int smwrite_u8(u8 addr, u8 val)
+{
+	acpi_status status;
+	int ret = -1;
+
+	status = oqo_lock_smbus(1);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	status = oqo_smbus_setb(addr, val);
+	if (ACPI_FAILURE(status))
+		goto skip;
+
+	ret = 0;
+skip:
+	status = oqo_lock_smbus(0);
+	if (ACPI_FAILURE(status))
+		return -1;
+	return ret;
+}
+
+/*
+ * Accelerometer inputdev
+ */
+
+/*
+ * Get a reading of the accelerometer from the firwmware and push
+ * it to an inputdev.
+ *
+ * Also the ambient light detector hitch-hikes on the inputdev, since
+ * it could be useful in some of the same applications for accelerometers.
+ *
+ * Available information and a bit of poking have not found a
+ * way to freeze a snapshot of the accelerometer data, so we have
+ * to do consistency checks to reduce the odds that we mix low
+ * and high bytes from different updates.
+ *
+ * Unfortunately SMBUS access is very slow (11ms) and the firmware API
+ * does not provide 2-byte transfers, so mixed readings happen and
+ * have to be corrected a lot.  (Do not know why; it should be a
+ * multi-kHz.. bus and the reads take only a hundred-ish cycles/byte.
+ * It is not the ACPI function -- it is slow on i2c-viapro as well.)
+ *
+ * Since there is such a big time lag between readings, the axis
+ * are decoupled and reported separately on different timelines as
+ * different events rather than as a set.
+ */
+static acpi_status oqo_read_kine(int *good, s16 *x, s16 *y, s16 *z,
+				 u16 *lumin)
+{
+	u8 hiregs[4] = { OQO_O2_SMB0_ACCEL_XHI,
+		OQO_O2_SMB0_ACCEL_YHI,
+		OQO_O2_SMB0_ACCEL_ZHI,
+		OQO_O2_SMB0_LUMIN_HI
+	};
+	u8 loregs[4] = { OQO_O2_SMB0_ACCEL_XLO,
+		OQO_O2_SMB0_ACCEL_YLO,
+		OQO_O2_SMB0_ACCEL_ZLO,
+		OQO_O2_SMB0_LUMIN_LO
+	};
+
+	short ax[4] = { ABS_X, ABS_Y, ABS_Z, ABS_MISC };
+	u8 realgood = 0;
+	u16 res[4];
+	acpi_status status;
+	int i;
+
+	*good = 0;
+
+	/* Routine: Starting with the lo byte, read lo/hi bytes
+	   alternately until two lo byte readings, match.  Then
+	   take that reading and combine it with the hi reading
+	   sandwiched between.  Errors can still happen when
+	   jittering at wrap boundaries, but should be rare.
+
+	   Don't use this for missile guidance.
+
+	   Userspace post-processing error detection encouraged.
+	 */
+	for (i = 0; i < 4; i++) {
+		int maxtry;
+		u32 log;
+		u8 r, lo, hi;
+
+		lo = loregs[i];
+		hi = hiregs[i];
+		log = 0;
+
+#define LOGRES(reg)  do { \
+			status = oqo_smbus_getb(reg, &r);		\
+			log <<= 8; log |= r; log &= 0xffffff;		\
+			if (ACPI_FAILURE(status))			\
+				goto leave;				\
+		} while (0)
+
+		maxtry = OQO_KINE_MAXTRY + 1;
+		while (maxtry) {
+			LOGRES(lo);
+			if (maxtry <= OQO_KINE_MAXTRY &&
+			    (log >> 16) == (log & 0xff)) {
+				*(res + i) = log & 0xffff;
+				break;
+			}
+			LOGRES(hi);
+			maxtry--;
+		}
+
+		if (maxtry == OQO_KINE_MAXTRY)
+			realgood |= 1 << i;
+
+		if (maxtry) {
+			*good |= 1 << i;
+			/* JIC CYA: this bit may be reserved */
+			res[3] &= 0x7fff;
+			input_report_abs(oqo_kine, ax[i], (s16) res[i]);
+		}
+		/* else we had trouble getting the reading to lock
+		   and we skip reporting this axis.
+		 */
+	}
+
+	*x = (u16) res[0];
+	*y = (u16) res[1];
+	*z = (u16) res[2];
+	*lumin = (u16) res[3];
+	return status;
+leave:
+	return status;
+}
+
+/*
+ * Generic Device (interface-independent)
+ */
+
+static void oqo_kine_poll(struct input_polled_dev *dev)
+{
+	s16 x, y, z;
+	u16 lumin;
+	int good;
+	/*      struct timeval tv1, tv2; */
+
+	if (dev != oqo_kine_polled)
+		return;
+	if (orig.kine_itvl < 0)
+		return;
+
+	x = y = z = 0;
+	oqo_read_kine(&good, &x, &y, &z, &lumin);
+}
+
+static int __devinit oqo_kine_init(void)
+{
+	int err;
+
+	oqo_kine = input_allocate_device();
+	if (!oqo_kine)
+		return -ENOMEM;
+
+	oqo_kine->name = "OQO embedded accelerometer";
+	oqo_kine->phys = "platform:oqo-wmi:kine";
+	oqo_kine->id.bustype = 0;
+	oqo_kine->id.vendor = 0;
+	oqo_kine->id.product = 2;
+	oqo_kine->id.version = 0;
+	oqo_kine->evbit[0] = BIT_MASK(EV_ABS);
+	set_bit(ABS_X, oqo_kine->absbit);
+	set_bit(ABS_Y, oqo_kine->absbit);
+	set_bit(ABS_Z, oqo_kine->absbit);
+	set_bit(ABS_MISC, oqo_kine->absbit);
+	oqo_kine->absmin[ABS_X] =
+	    oqo_kine->absmin[ABS_Y] =
+	    oqo_kine->absmin[ABS_Z] = oqo_kine->absmin[ABS_MISC] = -32768;
+	oqo_kine->absmax[ABS_X] =
+	    oqo_kine->absmax[ABS_Y] =
+	    oqo_kine->absmax[ABS_Z] = oqo_kine->absmax[ABS_MISC] = 32767;
+
+	memcpy(oqo_kine->dev.bus_id, "kine", 4);
+
+	oqo_kine_polled = input_allocate_polled_device();
+	if (!oqo_kine_polled) {
+		err = -ENOMEM;
+		goto bail0;
+	}
+
+	oqo_kine_polled->poll = oqo_kine_poll;
+	oqo_kine_polled->poll_interval = 250;
+	oqo_kine_polled->input = oqo_kine;
+
+	orig.kine_itvl = -1;	/* prevent callback from running */
+	err = input_register_polled_device(oqo_kine_polled);
+	if (err) {
+		printk(OQO_ERR "Failed to register OQO kine input\n");
+		goto bail1;
+	}
+
+	/* This will allow the callback to run now if successful. */
+	orig.kine_itvl = smread_u8(OQO_O2_SMB0_ACCEL_POLL_ITVL);
+	smwrite_u8(OQO_O2_SMB0_ACCEL_POLL_ITVL, 250);
+	curr.kine_itvl = smread_u8(OQO_O2_SMB0_ACCEL_POLL_ITVL);
+	if (orig.kine_itvl < 0 || curr.kine_itvl != 250) {
+		printk(OQO_ERR "Test communication with kine sensor failed\n");
+		err = -ENODEV;
+		goto bail2;
+	}
+
+	printk(OQO_INFO "Created OQO kine input.\n");
+	printk(OQO_INFO "Firmware interval %ims, driver interval %ims\n",
+	       curr.kine_itvl, oqo_kine_polled->poll_interval);
+	return 0;
+bail2:
+	input_unregister_polled_device(oqo_kine_polled);
+bail1:
+	input_free_polled_device(oqo_kine_polled);	/* frees oqo_kine */
+	return err;
+bail0:
+	input_free_device(oqo_kine);
+	return err;
+}
+
+static void __devexit oqo_kine_fini(void)
+{
+	smwrite_u8(OQO_O2_SMB0_ACCEL_POLL_ITVL, orig.kine_itvl);
+	input_unregister_polled_device(oqo_kine_polled);
+	input_free_polled_device(oqo_kine_polled);
+}
+
+/*
+ * Backlight device
+ */
+static int read_brightness(struct backlight_device *bd)
+{
+	return (int)smread_s16(OQO_O2_SMB0_BL_HI, OQO_O2_SMB0_BL_LO);
+}
+
+static int update_bl_status(struct backlight_device *bd)
+{
+	return smwrite_s16(OQO_O2_SMB0_BL_HI,
+			   OQO_O2_SMB0_BL_LO, (s16) bd->props.brightness);
+}
+
+static struct backlight_ops oqo_bl_ops = {
+	.get_brightness = read_brightness,
+	.update_status = update_bl_status,
+};
+
+static int __devinit oqo_backlight_init(struct device *dev)
+{
+	struct backlight_device *bd;
+
+	/*
+	 * It would be nice if someone would figure out how backlights
+	 * like these, which are not driven through the video hardware,
+	 * are supposed to find their associated fb and bind to it (and
+	 * rebind when fb drivers change.
+	 *
+	 * Most extras backlights just shove a junk name in like we do here,
+	 * and don't end up integrated with fbcon sysfs as a result.
+	 */
+	bd = backlight_device_register("oqo-bl", dev, NULL, &oqo_bl_ops);
+
+	if (IS_ERR(bd)) {
+		printk(OQO_ERR "Could not register OQO backlight device\n");
+		oqo_backlight_device = NULL;
+		return PTR_ERR(bd);
+	}
+
+	oqo_backlight_device = bd;
+	bd->props.max_brightness = 0x7fff;
+	curr.bl_bright = orig.bl_bright = bd->props.brightness =
+	    read_brightness(NULL);
+
+	if (bd->props.brightness < 0)
+		goto fail;
+
+	backlight_update_status(bd);
+	printk(OQO_INFO "Found backlight set at %i\n", bd->props.brightness);
+	return 0;
+
+fail:
+	backlight_device_unregister(oqo_backlight_device);
+	oqo_backlight_device = NULL;
+	return -ENODEV;
+}
+
+static void __devexit oqo_backlight_fini(void)
+{
+	if (!oqo_backlight_device)
+		return;
+	oqo_backlight_device->props.brightness = orig.bl_bright;
+	backlight_update_status(oqo_backlight_device);
+	backlight_device_unregister(oqo_backlight_device);
+}
+
+/*
+ * RFKill device
+ */
+
+static int oqo_rfkill_get(void *data, enum rfkill_state *state)
+{
+	int res;
+
+	res = smread_u8(OQO_O2_SMB0_WWAN_DSBL_ADDR);
+	if (res < 0)
+		return res;
+
+	res &= OQO_O2_SMB0_WWAN_DSBL_MASK;
+
+	if (res)
+		*state = RFKILL_STATE_SOFT_BLOCKED;
+	else
+		*state = RFKILL_STATE_UNBLOCKED;
+
+	return 0;
+}
+
+static int oqo_rfkill_toggle(void *data, enum rfkill_state state)
+{
+	int res;
+
+	res = smread_u8(OQO_O2_SMB0_WWAN_DSBL_ADDR);
+
+	if (state == RFKILL_STATE_UNBLOCKED)
+		res &= ~OQO_O2_SMB0_WWAN_DSBL_MASK;
+	else
+		res |= OQO_O2_SMB0_WWAN_DSBL_MASK;
+
+	return smwrite_u8(OQO_O2_SMB0_WWAN_DSBL_ADDR, res);
+}
+
+static int __devinit oqo_rfkill_init(struct device *dev)
+{
+	int res;
+
+	oqo_rfkill = rfkill_allocate(dev, RFKILL_TYPE_WWAN);
+	if (!oqo_rfkill)
+		return -ENODEV;
+
+	res = smread_u8(OQO_O2_SMB0_WWAN_DSBL_ADDR);
+	res &= OQO_O2_SMB0_WWAN_DSBL_MASK;
+
+	oqo_rfkill->name = "oqo-wwan";
+	if (res)
+		oqo_rfkill->state = RFKILL_STATE_SOFT_BLOCKED;
+	else
+		oqo_rfkill->state = RFKILL_STATE_UNBLOCKED;
+
+	oqo_rfkill->get_state = oqo_rfkill_get;
+	oqo_rfkill->toggle_radio = oqo_rfkill_toggle;
+	oqo_rfkill->user_claim_unsupported = 1;
+
+	res = rfkill_register(oqo_rfkill);
+
+	if (res)
+		rfkill_free(oqo_rfkill);
+
+	return res;
+}
+
+static void __devexit oqo_rfkill_fini(void)
+{
+	if (!oqo_rfkill)
+		return;
+	rfkill_unregister(oqo_rfkill);
+}
+
+/*
+ * Platform device
+ */
+
+static int __devinit oqo_platform_probe(struct platform_device *device)
+{
+	int err;
+	int i;
+	char *troubleok = "trouble, but continuing.\n";
+
+	memset(oqo_sn, 0, OQO_O2_SMB0_SERIAL_LEN + 1);
+	for (i = 0; i < OQO_O2_SMB0_SERIAL_LEN; i++) {
+		err = oqo_smbus_getb(OQO_O2_SMB0_SERIAL_START + i, oqo_sn + i);
+		if (err) {
+			printk(OQO_ERR "Serial number check failed.\n");
+			return err;
+		}
+	}
+	printk(OQO_INFO "Found OQO with serial number %s.\n", oqo_sn);
+
+	err = oqo_backlight_init(&device->dev);
+	if (err)
+		printk(OQO_ERR "Backlight init %s", troubleok);
+
+	err = oqo_rfkill_init(&device->dev);
+	if (err)
+		printk(OQO_ERR "RFKill init %s", troubleok);
+
+	/* LID does not work at all yet, and this may be taken
+	   care of by ACPI.
+	 */
+	orig.lid_wakes = smread_u8(OQO_O2_SMB0_LID_WAKES_ADDR);
+	orig.lid_wakes &= OQO_O2_SMB0_LID_WAKES_MASK;
+	orig.lid_wakes = curr.lid_wakes = !!orig.lid_wakes;
+	if (orig.lid_wakes < 0) {
+		printk(OQO_ERR "Wake on LID event %s", troubleok);
+	} else {
+		printk(OQO_INFO "Wake on LID is %s.\n",
+		       (orig.lid_wakes ? "on" : "off"));
+	}
+
+	err = oqo_kine_init();
+	return err;
+}
+
+static int oqo_platform_remove(struct platform_device *device)
+{
+	oqo_backlight_fini();
+	oqo_rfkill_fini();
+	oqo_kine_fini();
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int oqo_platform_suspend(struct platform_device *dev, pm_message_t state)
+{
+	if (!interface)
+		return -ENOMEM;
+
+	/* This sticks during boot so do not turn it entirely off */
+	if (oqo_backlight_device) {
+		curr.bl_bright = read_brightness(oqo_backlight_device);
+		smwrite_s16(OQO_O2_SMB0_BL_HI, OQO_O2_SMB0_BL_LO, 256);
+	}
+	return 0;
+}
+
+static int oqo_platform_resume(struct platform_device *device)
+{
+	if (!interface)
+		return -ENOMEM;
+
+	if (oqo_backlight_device) {
+		smwrite_s16(OQO_O2_SMB0_BL_HI,
+			    OQO_O2_SMB0_BL_LO, curr.bl_bright);
+	}
+
+	return 0;
+}
+
+#else
+#define oqo_platform_suspend NULL
+#define oqo_platform_resume  NULL
+#endif
+
+static struct platform_driver oqo_platform_driver = {
+	.driver = {
+		   .name = "oqo-wmi",
+		   .owner = THIS_MODULE,
+		   },
+	.probe = oqo_platform_probe,
+	.remove = oqo_platform_remove,
+	.suspend = oqo_platform_suspend,
+	.resume = oqo_platform_resume,
+};
+
+static int __init oqo_wmi_init(void)
+{
+	int err;
+
+	dmi_check_system(oqo_dmis);
+
+	if (!interface && force) {
+		model = oqo_models;
+		if (wmi_has_guid(OQO_O2_AMW0_GUID))
+			interface = &AMW0_interface;
+	}
+
+	if (!interface) {
+		printk(OQO_ERR "No or unsupported WMI interface. Aborting.\n");
+		printk(OQO_ERR "Hint: Get dmidecode working and try again.\n");
+		printk(OQO_ERR "(Check \"System Management BIOS\" in BIOS)\n");
+		if (!force)
+			printk(OQO_ERR "Use the force option to skip DMI"
+			       " checking\n");
+		return -ENODEV;
+	}
+
+	err = platform_driver_register(&oqo_platform_driver);
+	if (err) {
+		printk(OQO_ERR "platform_driver_register gave %d.\n", err);
+		goto bail0;
+	}
+
+	oqo_platform_device = platform_device_alloc("oqo-wmi", -1);
+	if (!oqo_platform_device) {
+		printk(OQO_ERR "Could not allocate platform device.\n");
+		err = -ENOMEM;
+		goto bail1;
+	}
+
+	err = platform_device_add(oqo_platform_device);
+	if (err) {
+		printk(OQO_ERR "platform_device_add gave %d.\n", err);
+		platform_device_put(oqo_platform_device);
+		goto bail1;
+	}
+
+	return 0;
+
+bail1:
+	platform_driver_unregister(&oqo_platform_driver);
+bail0:
+	return err;
+}
+
+static void __exit oqo_wmi_fini(void)
+{
+	platform_device_del(oqo_platform_device);
+	platform_driver_unregister(&oqo_platform_driver);
+
+	return;
+}
+
+module_init(oqo_wmi_init);
+module_exit(oqo_wmi_fini);

-- 
Matthew Garrett | mjg59@srcf.ucam.org
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