[patch] updated hdaps driver.

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To: Mr Morton <akpm@osdl.org>
Date:	Thu, 08 Sep 2005 12:25:55 -0400

Andrew,

Attached patch updates the hdaps driver in 2.6.13-mm2. It is a drop-in
replacement for the current patch.

Changes: bug fixes and an absolute input device.

Thanks,

        Robert Love

driver for hdaps

 MAINTAINERS | 7
 drivers/hwmon/Kconfig | 17 +
 drivers/hwmon/Makefile | 1
 drivers/hwmon/hdaps.c | 696 +++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 721 insertions(+)

diff -urN linux-2.6.13/drivers/hwmon/hdaps.c linux/drivers/hwmon/hdaps.c
--- linux-2.6.13/drivers/hwmon/hdaps.c 1969-12-31 19:00:00.000000000 -0500
+++ linux/drivers/hwmon/hdaps.c 2005-09-08 12:21:21.000000000 -0400
@@ -0,0 +1,696 @@
+/*
+ * drivers/hwmon/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 the IBM ThinkPad
+ * T41, T42, T43, R50, R50p, R51, and X40, at least. 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/device.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/dmi.h>
+#include <asm/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 celcius */
+#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_PERIOD (HZ/20) /* poll for input every 1/20s */
+#define HDAPS_INPUT_FUZZ 4 /* input event threshold */
+
+static struct timer_list hdaps_timer;
+static unsigned int hdaps_mousedev;
+static unsigned int hdaps_invert;
+static u8 km_activity;
+static int rest_x;
+static int rest_y;
+
+static DECLARE_MUTEX(hdaps_sem);
+
+/*
+ * __get_latch - Get the value from a given port. Callers must hold hdaps_sem.
+ */
+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_sem.
+ */
+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_sem.
+ */
+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_sem.
+ */
+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_sem.
+ */
+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_sem.
+ */
+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;
+
+ down(&hdaps_sem);
+
+ /* 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:
+ up(&hdaps_sem);
+ 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();
+
+ /* if hdaps_invert is set, negate the two values */
+ if (hdaps_invert) {
+ *x = -*x;
+ *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;
+
+ down(&hdaps_sem);
+ ret = __hdaps_read_pair(port1, port2, val1, val2);
+ up(&hdaps_sem);
+
+ return ret;
+}
+
+/* initialize the accelerometer */
+static int hdaps_device_init(void)
+{
+ int total, ret = -ENXIO;
+
+ down(&hdaps_sem);
+
+ 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:
+ up(&hdaps_sem);
+ return ret;
+}
+
+
+/* Device model stuff */
+
+static int hdaps_probe(struct 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 device *dev, u32 level)
+{
+ if (level == RESUME_ENABLE)
+ return hdaps_device_init();
+ return 0;
+}
+
+/* dummy release function -- everything is static, nothing to free */
+static void hdaps_dummy_release(struct device *dev) { }
+
+static struct device_driver hdaps_driver = {
+ .name = "hdaps",
+ .bus = &platform_bus_type,
+ .probe = hdaps_probe,
+ .resume = hdaps_resume
+};
+
+static struct platform_device pdev = {
+ .name = "hdaps",
+ .id = -1,
+ .dev = {
+ .release = hdaps_dummy_release,
+ },
+};
+
+
+/* Input class stuff */
+
+static struct input_dev hdaps_idev = {
+ .name = "hdaps",
+ .dev = &pdev.dev,
+ .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
+ .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
+ .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
+ .relbit = { BIT(REL_X) | BIT(REL_Y) },
+ .absmin = { [ABS_X] = -256, [ABS_Y] = -256 },
+ .absmax = { [ABS_X] = 256, [ABS_Y] = 256 },
+ .absfuzz = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ },
+ .absflat = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ },
+};
+
+/*
+ * hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_sem.
+ */
+static void hdaps_calibrate(void)
+{
+ __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
+}
+
+static void hdaps_mousedev_poll(unsigned long unused)
+{
+ int x, y;
+
+ /* Cannot sleep. Try nonblockingly. If we fail, try again later. */
+ if (down_trylock(&hdaps_sem)) {
+ mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD);
+ return;
+ }
+
+ if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
+ goto out;
+
+ x -= rest_x;
+ y -= rest_y;
+
+ if (abs(x) > HDAPS_INPUT_FUZZ)
+ input_report_rel(&hdaps_idev, REL_X, x);
+ if (abs(y) > HDAPS_INPUT_FUZZ)
+ input_report_rel(&hdaps_idev, REL_Y, y);
+
+ input_report_abs(&hdaps_idev, ABS_X, x);
+ input_report_abs(&hdaps_idev, ABS_Y, y);
+
+ input_sync(&hdaps_idev);
+
+ mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
+
+out:
+ up(&hdaps_sem);
+}
+
+/*
+ * hdaps_mousedev_enable - enable the input class device. Can sleep.
+ */
+static void hdaps_mousedev_enable(void)
+{
+ down(&hdaps_sem);
+
+ /* initial calibrate */
+ hdaps_calibrate();
+
+ /* initialize the input class */
+ input_register_device(&hdaps_idev);
+
+ /* start up our timer */
+ init_timer(&hdaps_timer);
+ hdaps_timer.function = hdaps_mousedev_poll;
+ hdaps_timer.expires = jiffies + HDAPS_POLL_PERIOD;
+ add_timer(&hdaps_timer);
+
+ hdaps_mousedev = 1;
+
+ up(&hdaps_sem);
+
+ printk(KERN_INFO "hdaps: input device enabled.\n");
+}
+
+/*
+ * hdaps_mousedev_disable - disable the input class device. Caller must hold
+ * hdaps_sem.
+ */
+static void hdaps_mousedev_disable(void)
+{
+ down(&hdaps_sem);
+ if (hdaps_mousedev) {
+ hdaps_mousedev = 0;
+ del_timer_sync(&hdaps_timer);
+ input_unregister_device(&hdaps_idev);
+ }
+ up(&hdaps_sem);
+}
+
+
+/* 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)
+{
+ down(&hdaps_sem);
+ hdaps_calibrate();
+ up(&hdaps_sem);
+
+ 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 != 1 && invert != 0))
+ return -EINVAL;
+
+ hdaps_invert = invert;
+ hdaps_calibrate();
+
+ return count;
+}
+
+static ssize_t hdaps_mousedev_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", hdaps_mousedev);
+}
+
+static ssize_t hdaps_mousedev_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int enable;
+
+ if (sscanf(buf, "%d", &enable) != 1)
+ return -EINVAL;
+
+ if (enable == 1)
+ hdaps_mousedev_enable();
+ else if (enable == 0)
+ hdaps_mousedev_disable();
+ else
+ return -EINVAL;
+
+ 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 DEVICE_ATTR(mousedev, 0644, hdaps_mousedev_show, hdaps_mousedev_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_mousedev.attr,
+ &dev_attr_invert.attr,
+ NULL,
+};
+
+static struct attribute_group hdaps_attribute_group = {
+ .attrs = hdaps_attributes,
+};
+
+
+/* Module stuff */
+
+/*
+ * XXX: We should be able to return nonzero and halt the detection process.
+ * But there is a bug in dmi_check_system() where a nonzero return from the
+ * first match will result in a return of failure from dmi_check_system().
+ * I fixed this; the patch is in 2.6-mm. Once in Linus's tree we can make
+ * hdaps_dmi_match_invert() return hdaps_dmi_match(), which in turn returns 1.
+ */
+static int hdaps_dmi_match(struct dmi_system_id *id)
+{
+ printk(KERN_INFO "hdaps: %s detected.\n", id->ident);
+ return 0;
+}
+
+static int hdaps_dmi_match_invert(struct dmi_system_id *id)
+{
+ hdaps_invert = 1;
+ printk(KERN_INFO "hdaps: inverting axis readings.\n");
+ return 0;
+}
+
+#define HDAPS_DMI_MATCH_NORMAL(model) { \
+ .ident = "IBM " model, \
+ .callback = hdaps_dmi_match, \
+ .matches = { \
+ DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \
+ DMI_MATCH(DMI_PRODUCT_VERSION, model) \
+ } \
+}
+
+#define HDAPS_DMI_MATCH_INVERT(model) { \
+ .ident = "IBM " model, \
+ .callback = hdaps_dmi_match_invert, \
+ .matches = { \
+ DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), \
+ DMI_MATCH(DMI_PRODUCT_VERSION, model) \
+ } \
+}
+
+static int __init hdaps_init(void)
+{
+ int ret;
+
+ /* Note that DMI_MATCH(...,"ThinkPad T42") will match "ThinkPad T42p" */
+ struct dmi_system_id hdaps_whitelist[] = {
+ HDAPS_DMI_MATCH_INVERT("ThinkPad R50p"),
+ HDAPS_DMI_MATCH_NORMAL("ThinkPad R50"),
+ HDAPS_DMI_MATCH_NORMAL("ThinkPad R51"),
+ HDAPS_DMI_MATCH_INVERT("ThinkPad T41p"),
+ HDAPS_DMI_MATCH_NORMAL("ThinkPad T41"),
+ HDAPS_DMI_MATCH_INVERT("ThinkPad T42p"),
+ HDAPS_DMI_MATCH_NORMAL("ThinkPad T42"),
+ HDAPS_DMI_MATCH_NORMAL("ThinkPad T43"),
+ HDAPS_DMI_MATCH_NORMAL("ThinkPad X40"),
+ { .ident = NULL }
+ };
+
+ if (!dmi_check_system(hdaps_whitelist)) {
+ printk(KERN_WARNING "hdaps: supported laptop not found!\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ if (!request_region(HDAPS_LOW_PORT, HDAPS_NR_PORTS, "hdaps")) {
+ ret = -ENXIO;
+ goto out;
+ }
+
+ ret = driver_register(&hdaps_driver);
+ if (ret)
+ goto out_region;
+
+ ret = platform_device_register(&pdev);
+ if (ret)
+ goto out_driver;
+
+ ret = sysfs_create_group(&pdev.dev.kobj, &hdaps_attribute_group);
+ if (ret)
+ goto out_device;
+
+ if (hdaps_mousedev)
+ hdaps_mousedev_enable();
+
+ printk(KERN_INFO "hdaps: driver successfully loaded.\n");
+ return 0;
+
+out_device:
+ platform_device_unregister(&pdev);
+out_driver:
+ 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)
+{
+ hdaps_mousedev_disable();
+ sysfs_remove_group(&pdev.dev.kobj, &hdaps_attribute_group);
+ platform_device_unregister(&pdev);
+ 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(mousedev, hdaps_mousedev, bool, 0);
+MODULE_PARM_DESC(mousedev, "enable the input class device");
+
+module_param_named(invert, hdaps_invert, bool, 0);
+MODULE_PARM_DESC(invert, "invert data along each axis");
+
+MODULE_AUTHOR("Robert Love");
+MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver");
+MODULE_LICENSE("GPL v2");
diff -urN linux-2.6.13/drivers/hwmon/Kconfig linux/drivers/hwmon/Kconfig
--- linux-2.6.13/drivers/hwmon/Kconfig 2005-08-28 19:41:01.000000000 -0400
+++ linux/drivers/hwmon/Kconfig 2005-09-08 12:23:02.000000000 -0400
@@ -407,6 +407,23 @@
           This driver can also be built as a module. If so, the module
           will be called w83627ehf.
 
+config SENSORS_HDAPS
+ tristate "IBM Hard Drive Active Protection System (hdaps)"
+ depends on HWMON && INPUT && X86
+ default n
+ help
+ This driver provides support for the IBM Hard Drive Active Protection
+ System (hdaps), which provides an accelerometer and other misc. data.
+ Supported laptops include the IBM ThinkPad T41, T42, T43, and R51.
+ The accelerometer data is readable via sysfs.
+
+ This driver also provides an input class device, allowing the
+ laptop to act as a pinball machine-esque mouse. This is off by
+ default but enabled via sysfs or the module parameter "mousedev".
+
+ Say Y here if you have an applicable laptop and want to experience
+ the awesome power of hdaps.
+
 config HWMON_DEBUG_CHIP
         bool "Hardware Monitoring Chip debugging messages"
         depends on HWMON
diff -urN linux-2.6.13/drivers/hwmon/Makefile linux/drivers/hwmon/Makefile
--- linux-2.6.13/drivers/hwmon/Makefile 2005-08-28 19:41:01.000000000 -0400
+++ linux/drivers/hwmon/Makefile 2005-09-08 12:21:07.000000000 -0400
@@ -18,6 +18,7 @@
 obj-$(CONFIG_SENSORS_FSCPOS) += fscpos.o
 obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
 obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
+obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
 obj-$(CONFIG_SENSORS_IT87) += it87.o
 obj-$(CONFIG_SENSORS_LM63) += lm63.o
 obj-$(CONFIG_SENSORS_LM75) += lm75.o
diff -urN linux-2.6.13/MAINTAINERS linux/MAINTAINERS
--- linux-2.6.13/MAINTAINERS 2005-08-28 19:41:01.000000000 -0400
+++ linux/MAINTAINERS 2005-09-08 12:22:28.000000000 -0400
@@ -933,6 +933,13 @@
 W: http://www.kernel.org/pub/linux/utils/net/hdlc/
 S: Maintained
 
+Hard Drive Active Protection System (HDAPS)
+P: Robert Love
+M: rlove@rlove.org
+M: linux-kernel@vger.kernel.org
+W: http://www.kernel.org/pub/linux/kernel/people/rml/hdaps/
+S: Maintained
+
 HARMONY SOUND DRIVER
 P: Kyle McMartin
 M: kyle@parisc-linux.org

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