Move hdaps driver to platform/x86

The hdaps driver isn't a hardware monitoring driver, so it shouldn't
live under driver/hwmon. drivers/platform/x86 seems much more
appropriate, as the driver is only useful on x86 laptops.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Frank Seidel <frank@f-seidel.de>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

3 files changed, 658 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index b49f9b143a7f..d2d15108ce4b 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -368,6 +368,26 @@ config THINKPAD_ACPI_HOTKEY_POLL
           If you are not sure, say Y here.  The driver enables polling only if
           it is strictly necessary to do so.
 
+config SENSORS_HDAPS
+        tristate "Thinkpad Hard Drive Active Protection System (hdaps)"
+        depends on INPUT && X86
+        select INPUT_POLLDEV
+        default n
+        help
+          This driver provides support for the IBM Hard Drive Active Protection
+          System (hdaps), which provides an accelerometer and other misc. data.
+          ThinkPads starting with the R50, T41, and X40 are supported.  The
+          accelerometer data is readable via sysfs.
+
+          This driver also provides an absolute input class device, allowing
+          the laptop to act as a pinball machine-esque joystick.
+
+          If your ThinkPad is not recognized by the driver, please update to latest
+          BIOS. This is especially the case for some R52 ThinkPads.
+
+          Say Y here if you have an applicable laptop and want to experience
+          the awesome power of hdaps.
+
 config INTEL_MENLOW
         tristate "Thermal Management driver for Intel menlow platform"
         depends on ACPI_THERMAL
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index b26df2eac235..c97ac2a9dab7 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_TC1100_WMI)	+= tc1100-wmi.o
 obj-$(CONFIG_SONY_LAPTOP)       += sony-laptop.o
 obj-$(CONFIG_IDEAPAD_LAPTOP)    += ideapad-laptop.o
 obj-$(CONFIG_THINKPAD_ACPI)     += thinkpad_acpi.o
+obj-$(CONFIG_SENSORS_HDAPS)     += hdaps.o
 obj-$(CONFIG_FUJITSU_LAPTOP)    += fujitsu-laptop.o
 obj-$(CONFIG_PANASONIC_LAPTOP)  += panasonic-laptop.o
 obj-$(CONFIG_INTEL_MENLOW)      += intel_menlow.o
diff --git a/drivers/platform/x86/hdaps.c b/drivers/platform/x86/hdaps.c
new file mode 100644
index 000000000000..067bf36d32f3
--- /dev/null
+++ b/drivers/platform/x86/hdaps.c
@@ -0,0 +1,637 @@
+/*
+ * hdaps.c - driver for IBM's Hard Drive Active Protection System
+ *
+ * Copyright (C) 2005 Robert Love <rml@novell.com>
+ * Copyright (C) 2005 Jesper Juhl <jesper.juhl@gmail.com>
+ *
+ * The HardDisk Active Protection System (hdaps) is present in IBM ThinkPads
+ * starting with the R40, T41, and X40.  It provides a basic two-axis
+ * accelerometer and other data, such as the device's temperature.
+ *
+ * This driver is based on the document by Mark A. Smith available at
+ * http://www.almaden.ibm.com/cs/people/marksmith/tpaps.html and a lot of trial
+ * and error.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License v2 as published by the
+ * Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/input-polldev.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/dmi.h>
+#include <linux/jiffies.h>
+#include <linux/io.h>
+
+#define HDAPS_LOW_PORT          0x1600  /* first port used by hdaps */
+#define HDAPS_NR_PORTS          0x30    /* number of ports: 0x1600 - 0x162f */
+
+#define HDAPS_PORT_STATE        0x1611  /* device state */
+#define HDAPS_PORT_YPOS         0x1612  /* y-axis position */
+#define HDAPS_PORT_XPOS         0x1614  /* x-axis position */
+#define HDAPS_PORT_TEMP1        0x1616  /* device temperature, in Celsius */
+#define HDAPS_PORT_YVAR         0x1617  /* y-axis variance (what is this?) */
+#define HDAPS_PORT_XVAR         0x1619  /* x-axis variance (what is this?) */
+#define HDAPS_PORT_TEMP2        0x161b  /* device temperature (again?) */
+#define HDAPS_PORT_UNKNOWN      0x161c  /* what is this? */
+#define HDAPS_PORT_KMACT        0x161d  /* keyboard or mouse activity */
+
+#define STATE_FRESH             0x50    /* accelerometer data is fresh */
+
+#define KEYBD_MASK              0x20    /* set if keyboard activity */
+#define MOUSE_MASK              0x40    /* set if mouse activity */
+#define KEYBD_ISSET(n)          (!! (n & KEYBD_MASK))   /* keyboard used? */
+#define MOUSE_ISSET(n)          (!! (n & MOUSE_MASK))   /* mouse used? */
+
+#define INIT_TIMEOUT_MSECS      4000    /* wait up to 4s for device init ... */
+#define INIT_WAIT_MSECS         200     /* ... in 200ms increments */
+
+#define HDAPS_POLL_INTERVAL     50      /* poll for input every 1/20s (50 ms)*/
+#define HDAPS_INPUT_FUZZ        4       /* input event threshold */
+#define HDAPS_INPUT_FLAT        4
+
+#define HDAPS_X_AXIS            (1 << 0)
+#define HDAPS_Y_AXIS            (1 << 1)
+#define HDAPS_BOTH_AXES         (HDAPS_X_AXIS | HDAPS_Y_AXIS)
+
+static struct platform_device *pdev;
+static struct input_polled_dev *hdaps_idev;
+static unsigned int hdaps_invert;
+static u8 km_activity;
+static int rest_x;
+static int rest_y;
+
+static DEFINE_MUTEX(hdaps_mtx);
+
+/*
+ * __get_latch - Get the value from a given port.  Callers must hold hdaps_mtx.
+ */
+static inline u8 __get_latch(u16 port)
+{
+        return inb(port) & 0xff;
+}
+
+/*
+ * __check_latch - Check a port latch for a given value.  Returns zero if the
+ * port contains the given value.  Callers must hold hdaps_mtx.
+ */
+static inline int __check_latch(u16 port, u8 val)
+{
+        if (__get_latch(port) == val)
+                return 0;
+        return -EINVAL;
+}
+
+/*
+ * __wait_latch - Wait up to 100us for a port latch to get a certain value,
+ * returning zero if the value is obtained.  Callers must hold hdaps_mtx.
+ */
+static int __wait_latch(u16 port, u8 val)
+{
+        unsigned int i;
+
+        for (i = 0; i < 20; i++) {
+                if (!__check_latch(port, val))
+                        return 0;
+                udelay(5);
+        }
+
+        return -EIO;
+}
+
+/*
+ * __device_refresh - request a refresh from the accelerometer.  Does not wait
+ * for refresh to complete.  Callers must hold hdaps_mtx.
+ */
+static void __device_refresh(void)
+{
+        udelay(200);
+        if (inb(0x1604) != STATE_FRESH) {
+                outb(0x11, 0x1610);
+                outb(0x01, 0x161f);
+        }
+}
+
+/*
+ * __device_refresh_sync - request a synchronous refresh from the
+ * accelerometer.  We wait for the refresh to complete.  Returns zero if
+ * successful and nonzero on error.  Callers must hold hdaps_mtx.
+ */
+static int __device_refresh_sync(void)
+{
+        __device_refresh();
+        return __wait_latch(0x1604, STATE_FRESH);
+}
+
+/*
+ * __device_complete - indicate to the accelerometer that we are done reading
+ * data, and then initiate an async refresh.  Callers must hold hdaps_mtx.
+ */
+static inline void __device_complete(void)
+{
+        inb(0x161f);
+        inb(0x1604);
+        __device_refresh();
+}
+
+/*
+ * hdaps_readb_one - reads a byte from a single I/O port, placing the value in
+ * the given pointer.  Returns zero on success or a negative error on failure.
+ * Can sleep.
+ */
+static int hdaps_readb_one(unsigned int port, u8 *val)
+{
+        int ret;
+
+        mutex_lock(&hdaps_mtx);
+
+        /* do a sync refresh -- we need to be sure that we read fresh data */
+        ret = __device_refresh_sync();
+        if (ret)
+                goto out;
+
+        *val = inb(port);
+        __device_complete();
+
+out:
+        mutex_unlock(&hdaps_mtx);
+        return ret;
+}
+
+/* __hdaps_read_pair - internal lockless helper for hdaps_read_pair(). */
+static int __hdaps_read_pair(unsigned int port1, unsigned int port2,
+                             int *x, int *y)
+{
+        /* do a sync refresh -- we need to be sure that we read fresh data */
+        if (__device_refresh_sync())
+                return -EIO;
+
+        *y = inw(port2);
+        *x = inw(port1);
+        km_activity = inb(HDAPS_PORT_KMACT);
+        __device_complete();
+
+        /* hdaps_invert is a bitvector to negate the axes */
+        if (hdaps_invert & HDAPS_X_AXIS)
+                *x = -*x;
+        if (hdaps_invert & HDAPS_Y_AXIS)
+                *y = -*y;
+
+        return 0;
+}
+
+/*
+ * hdaps_read_pair - reads the values from a pair of ports, placing the values
+ * in the given pointers.  Returns zero on success.  Can sleep.
+ */
+static int hdaps_read_pair(unsigned int port1, unsigned int port2,
+                           int *val1, int *val2)
+{
+        int ret;
+
+        mutex_lock(&hdaps_mtx);
+        ret = __hdaps_read_pair(port1, port2, val1, val2);
+        mutex_unlock(&hdaps_mtx);
+
+        return ret;
+}
+
+/*
+ * hdaps_device_init - initialize the accelerometer.  Returns zero on success
+ * and negative error code on failure.  Can sleep.
+ */
+static int hdaps_device_init(void)
+{
+        int total, ret = -ENXIO;
+
+        mutex_lock(&hdaps_mtx);
+
+        outb(0x13, 0x1610);
+        outb(0x01, 0x161f);
+        if (__wait_latch(0x161f, 0x00))
+                goto out;
+
+        /*
+         * Most ThinkPads return 0x01.
+         *
+         * Others--namely the R50p, T41p, and T42p--return 0x03.  These laptops
+         * have "inverted" axises.
+         *
+         * The 0x02 value occurs when the chip has been previously initialized.
+         */
+        if (__check_latch(0x1611, 0x03) &&
+                     __check_latch(0x1611, 0x02) &&
+                     __check_latch(0x1611, 0x01))
+                goto out;
+
+        printk(KERN_DEBUG "hdaps: initial latch check good (0x%02x).\n",
+               __get_latch(0x1611));
+
+        outb(0x17, 0x1610);
+        outb(0x81, 0x1611);
+        outb(0x01, 0x161f);
+        if (__wait_latch(0x161f, 0x00))
+                goto out;
+        if (__wait_latch(0x1611, 0x00))
+                goto out;
+        if (__wait_latch(0x1612, 0x60))
+                goto out;
+        if (__wait_latch(0x1613, 0x00))
+                goto out;
+        outb(0x14, 0x1610);
+        outb(0x01, 0x1611);
+        outb(0x01, 0x161f);
+        if (__wait_latch(0x161f, 0x00))
+                goto out;
+        outb(0x10, 0x1610);
+        outb(0xc8, 0x1611);
+        outb(0x00, 0x1612);
+        outb(0x02, 0x1613);
+        outb(0x01, 0x161f);
+        if (__wait_latch(0x161f, 0x00))
+                goto out;
+        if (__device_refresh_sync())
+                goto out;
+        if (__wait_latch(0x1611, 0x00))
+                goto out;
+
+        /* we have done our dance, now let's wait for the applause */
+        for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
+                int x, y;
+
+                /* a read of the device helps push it into action */
+                __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
+                if (!__wait_latch(0x1611, 0x02)) {
+                        ret = 0;
+                        break;
+                }
+
+                msleep(INIT_WAIT_MSECS);
+        }
+
+out:
+        mutex_unlock(&hdaps_mtx);
+        return ret;
+}
+
+
+/* Device model stuff */
+
+static int hdaps_probe(struct platform_device *dev)
+{
+        int ret;
+
+        ret = hdaps_device_init();
+        if (ret)
+                return ret;
+
+        printk(KERN_INFO "hdaps: device successfully initialized.\n");
+        return 0;
+}
+
+static int hdaps_resume(struct platform_device *dev)
+{
+        return hdaps_device_init();
+}
+
+static struct platform_driver hdaps_driver = {
+        .probe = hdaps_probe,
+        .resume = hdaps_resume,
+        .driver = {
+                .name = "hdaps",
+                .owner = THIS_MODULE,
+        },
+};
+
+/*
+ * hdaps_calibrate - Set our "resting" values.  Callers must hold hdaps_mtx.
+ */
+static void hdaps_calibrate(void)
+{
+        __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
+}
+
+static void hdaps_mousedev_poll(struct input_polled_dev *dev)
+{
+        struct input_dev *input_dev = dev->input;
+        int x, y;
+
+        mutex_lock(&hdaps_mtx);
+
+        if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
+                goto out;
+
+        input_report_abs(input_dev, ABS_X, x - rest_x);
+        input_report_abs(input_dev, ABS_Y, y - rest_y);
+        input_sync(input_dev);
+
+out:
+        mutex_unlock(&hdaps_mtx);
+}
+
+
+/* Sysfs Files */
+
+static ssize_t hdaps_position_show(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        int ret, x, y;
+
+        ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
+        if (ret)
+                return ret;
+
+        return sprintf(buf, "(%d,%d)\n", x, y);
+}
+
+static ssize_t hdaps_variance_show(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        int ret, x, y;
+
+        ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y);
+        if (ret)
+                return ret;
+
+        return sprintf(buf, "(%d,%d)\n", x, y);
+}
+
+static ssize_t hdaps_temp1_show(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        u8 temp;
+        int ret;
+
+        ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp);
+        if (ret < 0)
+                return ret;
+
+        return sprintf(buf, "%u\n", temp);
+}
+
+static ssize_t hdaps_temp2_show(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        u8 temp;
+        int ret;
+
+        ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp);
+        if (ret < 0)
+                return ret;
+
+        return sprintf(buf, "%u\n", temp);
+}
+
+static ssize_t hdaps_keyboard_activity_show(struct device *dev,
+                                            struct device_attribute *attr,
+                                            char *buf)
+{
+        return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity));
+}
+
+static ssize_t hdaps_mouse_activity_show(struct device *dev,
+                                         struct device_attribute *attr,
+                                         char *buf)
+{
+        return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity));
+}
+
+static ssize_t hdaps_calibrate_show(struct device *dev,
+                                    struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "(%d,%d)\n", rest_x, rest_y);
+}
+
+static ssize_t hdaps_calibrate_store(struct device *dev,
+                                     struct device_attribute *attr,
+                                     const char *buf, size_t count)
+{
+        mutex_lock(&hdaps_mtx);
+        hdaps_calibrate();
+        mutex_unlock(&hdaps_mtx);
+
+        return count;
+}
+
+static ssize_t hdaps_invert_show(struct device *dev,
+                                 struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%u\n", hdaps_invert);
+}
+
+static ssize_t hdaps_invert_store(struct device *dev,
+                                  struct device_attribute *attr,
+                                  const char *buf, size_t count)
+{
+        int invert;
+
+        if (sscanf(buf, "%d", &invert) != 1 ||
+            invert < 0 || invert > HDAPS_BOTH_AXES)
+                return -EINVAL;
+
+        hdaps_invert = invert;
+        hdaps_calibrate();
+
+        return count;
+}
+
+static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
+static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
+static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
+static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL);
+static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL);
+static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
+static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);
+static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store);
+
+static struct attribute *hdaps_attributes[] = {
+        &dev_attr_position.attr,
+        &dev_attr_variance.attr,
+        &dev_attr_temp1.attr,
+        &dev_attr_temp2.attr,
+        &dev_attr_keyboard_activity.attr,
+        &dev_attr_mouse_activity.attr,
+        &dev_attr_calibrate.attr,
+        &dev_attr_invert.attr,
+        NULL,
+};
+
+static struct attribute_group hdaps_attribute_group = {
+        .attrs = hdaps_attributes,
+};
+
+
+/* Module stuff */
+
+/* hdaps_dmi_match - found a match.  return one, short-circuiting the hunt. */
+static int __init hdaps_dmi_match(const struct dmi_system_id *id)
+{
+        printk(KERN_INFO "hdaps: %s detected.\n", id->ident);
+        return 1;
+}
+
+/* hdaps_dmi_match_invert - found an inverted match. */
+static int __init hdaps_dmi_match_invert(const struct dmi_system_id *id)
+{
+        hdaps_invert = (unsigned long)id->driver_data;
+        printk(KERN_INFO "hdaps: inverting axis (%u) readings.\n",
+               hdaps_invert);
+        return hdaps_dmi_match(id);
+}
+
+#define HDAPS_DMI_MATCH_INVERT(vendor, model, axes) {   \
+        .ident = vendor " " model,                      \
+        .callback = hdaps_dmi_match_invert,             \
+        .driver_data = (void *)axes,                    \
+        .matches = {                                    \
+                DMI_MATCH(DMI_BOARD_VENDOR, vendor),    \
+                DMI_MATCH(DMI_PRODUCT_VERSION, model)   \
+        }                                               \
+}
+
+#define HDAPS_DMI_MATCH_NORMAL(vendor, model)           \
+        HDAPS_DMI_MATCH_INVERT(vendor, model, 0)
+
+/* Note that HDAPS_DMI_MATCH_NORMAL("ThinkPad T42") would match
+   "ThinkPad T42p", so the order of the entries matters.
+   If your ThinkPad is not recognized, please update to latest
+   BIOS. This is especially the case for some R52 ThinkPads. */
+static struct dmi_system_id __initdata hdaps_whitelist[] = {
+        HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad R50p", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R50"),
+        HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R51"),
+        HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad R52"),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61i", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T41p", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T41"),
+        HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T42p", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T42"),
+        HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T43"),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T400", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T60", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61p", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad X40"),
+        HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad X41", HDAPS_Y_AXIS),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X60", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61s", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad Z60m"),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61m", HDAPS_BOTH_AXES),
+        HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61p", HDAPS_BOTH_AXES),
+        { .ident = NULL }
+};
+
+static int __init hdaps_init(void)
+{
+        struct input_dev *idev;
+        int ret;
+
+        if (!dmi_check_system(hdaps_whitelist)) {
+                printk(KERN_WARNING "hdaps: supported laptop not found!\n");
+                ret = -ENODEV;
+                goto out;
+        }
+
+        if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) {
+                ret = -ENXIO;
+                goto out;
+        }
+
+        ret = platform_driver_register(&hdaps_driver);
+        if (ret)
+                goto out_region;
+
+        pdev = platform_device_register_simple("hdaps", -1, NULL, 0);
+        if (IS_ERR(pdev)) {
+                ret = PTR_ERR(pdev);
+                goto out_driver;
+        }
+
+        ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group);
+        if (ret)
+                goto out_device;
+
+        hdaps_idev = input_allocate_polled_device();
+        if (!hdaps_idev) {
+                ret = -ENOMEM;
+                goto out_group;
+        }
+
+        hdaps_idev->poll = hdaps_mousedev_poll;
+        hdaps_idev->poll_interval = HDAPS_POLL_INTERVAL;
+
+        /* initial calibrate for the input device */
+        hdaps_calibrate();
+
+        /* initialize the input class */
+        idev = hdaps_idev->input;
+        idev->name = "hdaps";
+        idev->phys = "isa1600/input0";
+        idev->id.bustype = BUS_ISA;
+        idev->dev.parent = &pdev->dev;
+        idev->evbit[0] = BIT_MASK(EV_ABS);
+        input_set_abs_params(idev, ABS_X,
+                        -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
+        input_set_abs_params(idev, ABS_Y,
+                        -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
+
+        ret = input_register_polled_device(hdaps_idev);
+        if (ret)
+                goto out_idev;
+
+        printk(KERN_INFO "hdaps: driver successfully loaded.\n");
+        return 0;
+
+out_idev:
+        input_free_polled_device(hdaps_idev);
+out_group:
+        sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
+out_device:
+        platform_device_unregister(pdev);
+out_driver:
+        platform_driver_unregister(&hdaps_driver);
+out_region:
+        release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
+out:
+        printk(KERN_WARNING "hdaps: driver init failed (ret=%d)!\n", ret);
+        return ret;
+}
+
+static void __exit hdaps_exit(void)
+{
+        input_unregister_polled_device(hdaps_idev);
+        input_free_polled_device(hdaps_idev);
+        sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
+        platform_device_unregister(pdev);
+        platform_driver_unregister(&hdaps_driver);
+        release_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS);
+
+        printk(KERN_INFO "hdaps: driver unloaded.\n");
+}
+
+module_init(hdaps_init);
+module_exit(hdaps_exit);
+
+module_param_named(invert, hdaps_invert, int, 0);
+MODULE_PARM_DESC(invert, "invert data along each axis. 1 invert x-axis, "
+                 "2 invert y-axis, 3 invert both axes.");
+
+MODULE_AUTHOR("Robert Love");
+MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver");
+MODULE_LICENSE("GPL v2");