[patch] IBM HDAPS accelerometer driver, with probing.

From: Robert Love (rml_at_novell.com)
Date: 08/27/05

  • Next message: Danial Thom: "Re: 2.6.12 Performance problems" 
    To: Andrew Morton <akpm@osdl.org>
Date:	Fri, 26 Aug 2005 18:18:45 -0400

    Andrew,

    Attached patch provides a driver for the IBM Hard Drive Active
    Protection System (hdaps) on top of 2.6.13-rc6-mm2.

    Over the previous post, it contains several fixes and improvements,
    including a dev->probe() routine and a DMI whitelist.

            Robert Love

    Driver for the IBM HDAPS

    Signed-off-by: Robert Love <rml@novell.com>

     MAINTAINERS | 7
     drivers/hwmon/Kconfig | 17 +
     drivers/hwmon/Makefile | 1
     drivers/hwmon/hdaps.c | 664 +++++++++++++++++++++++++++++++++++++++++++++++++
     4 files changed, 689 insertions(+)

    diff -urN linux-2.6.13-rc6-mm2/drivers/hwmon/hdaps.c linux/drivers/hwmon/hdaps.c
    --- linux-2.6.13-rc6-mm2/drivers/hwmon/hdaps.c 1969-12-31 19:00:00.000000000 -0500
    +++ linux/drivers/hwmon/hdaps.c 2005-08-26 18:17:33.000000000 -0400
    @@ -0,0 +1,664 @@
    +/*
    + * 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, and R51, at least. It provides a basic two-axis
    + * accelerometer and other misc. data.
    + *
    + * 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 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.
    + */
    +
    +#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 <linux/spinlock.h>
    +#include <asm/io.h>
    +
    +#define HDAPS_LOW_PORT 0x1600 /* first port used by hdaps */
    +#define HDAPS_HIGH_PORT 0x162f /* last port used by hdaps */
    +
    +#define STATE_FRESH 0x50 /* accelerometer data is fresh */
    +
    +#define REFRESH_ASYNC 0x00 /* do asynchronous refresh */
    +#define REFRESH_SYNC 0x01 /* do synchronous refresh */
    +
    +#define HDAPS_PORT_STATE 0x1611 /* device state */
    +#define HDAPS_PORT_XPOS 0x1612 /* x-axis position */
    +#define HDAPS_PORT_YPOS 0x1614 /* y-axis position */
    +#define HDAPS_PORT_TEMP 0x1616 /* device temperature, in celcius */
    +#define HDAPS_PORT_XVAR 0x1617 /* x-axis variance (what is this?) */
    +#define HDAPS_PORT_YVAR 0x1619 /* y-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 HDAPS_READ_MASK 0xff /* some reads have the low 8 bits set */
    +
    +#define KEYBD_MASK 0x20 /* set if keyboard activity */
    +#define MOUSE_MASK 0x40 /* set if mouse activity */
    +
    +#define KEYBD_ISSET(n) (!! (n & KEYBD_MASK))
    +#define MOUSE_ISSET(n) (!! (n & MOUSE_MASK))
    +
    +static spinlock_t hdaps_lock = SPIN_LOCK_UNLOCKED;
    +
    +
    +/*
    + * __get_latch - Get the value from a given port latch. Callers must hold
    + * hdaps_lock.
    + */
    +static inline unsigned short __get_latch(unsigned short port)
    +{
    + return inb(port) & HDAPS_READ_MASK;
    +}
    +
    +/*
    + * __check_latch - Check a port latch for a given value. Callers must hold
    + * hdaps_lock.
    + */
    +static inline unsigned int __check_latch(unsigned short port, unsigned char val)
    +{
    + if (__get_latch(port) == val)
    + return 1;
    + return 0;
    +}
    +
    +/*
    + * __wait_latch - Wait up to 100us for a port latch to get a certain value,
    + * returning nonzero if the value is obtained and zero otherwise. Callers
    + * must hold hdaps_lock.
    + */
    +static unsigned int __wait_latch(unsigned short port, unsigned char val)
    +{
    + unsigned int i;
    +
    + for (i = 0; i < 20; i++) {
    + if (__check_latch(port, val))
    + return 1;
    + udelay(5);
    + }
    +
    + return 0;
    +}
    +
    +/*
    + * __request_refresh - Request a refresh from the accelerometer.
    + *
    + * If sync is REFRESH_SYNC, we perform a synchronous refresh and will wait for
    + * the refresh. Returns nonzero if successful or zero on error.
    + *
    + * If sync is REFRESH_ASYNC, we merely kick off a new refresh if the device is
    + * not up-to-date. Always returns true. On the next read from the device, the
    + * data should be up-to-date but a synchronous wait should be performed to be
    + * sure.
    + *
    + * Callers must hold hdaps_lock.
    + */
    +static int __request_refresh(int sync)
    +{
    + unsigned char state;
    +
    + state = inb(0x1604);
    + if (state == STATE_FRESH)
    + return 1;
    + else {
    + outb(0x11, 0x1610);
    + outb(0x01, 0x161f);
    + if (sync == REFRESH_ASYNC)
    + return 1;
    + }
    +
    + return __wait_latch(0x1604, STATE_FRESH);
    +}
    +
    +/*
    + * __tell_accelerometer_done - Indicate to the accelerometer that we are done
    + * reading data. Callers must hold hdaps_lock.
    + */
    +static inline void __tell_accelerometer_done(void)
    +{
    + inb(0x161f);
    + inb(0x1604);
    +}
    +
    +/* internal lockless helper for accelerometer_readb_one */
    +static int __accelerometer_readb_one(unsigned int port, u8 *val)
    +{
    + int ret = 0;
    +
    + /* do a sync refresh - we need to be sure we read fresh data */
    + if (unlikely(!__request_refresh(REFRESH_SYNC))) {
    + ret = -EIO;
    + goto out;
    + }
    +
    + *val = inb(port);
    +
    + __tell_accelerometer_done();
    +
    + if (unlikely(!__request_refresh(REFRESH_ASYNC)))
    + ret = -EIO;
    +
    +out:
    + return ret;
    +}
    +
    +/*
    + * accelerometer_readb_one - reads a byte from a single given I/O port,
    + * placing the value in the given pointer. Returns zero on success or a
    + * negative error on failure.
    + */
    +static int accelerometer_readb_one(unsigned int port, u8 *val)
    +{
    + int ret = 0;
    +
    + spin_lock(&hdaps_lock);
    + ret = __accelerometer_readb_one(port, val);
    + spin_unlock(&hdaps_lock);
    + return ret;
    +}
    +
    +/*
    + * accelerometer_read_pair - reads the values from a given pair of I/O ports,
    + * placing the values in the given pointers. Returns zero on success or a
    + * negative error on failure.
    + */
    +static int accelerometer_read_pair(unsigned int port1, unsigned int port2,
    + int *val1, int *val2)
    +{
    + int ret = 0;
    +
    + spin_lock(&hdaps_lock);
    +
    + /* do a sync refresh - we need to be sure we read fresh data */
    + if (unlikely(!__request_refresh(REFRESH_SYNC))) {
    + ret = -EIO;
    + goto out;
    + }
    +
    + *val1 = inw(port1);
    + *val2 = inw(port2);
    +
    + __tell_accelerometer_done();
    +
    + if (unlikely(!__request_refresh(REFRESH_ASYNC)))
    + ret = -EIO;
    +
    +out:
    + spin_unlock(&hdaps_lock);
    + return ret;
    +}
    +
    +#define INIT_TIMEOUT_MSECS 4000 /* wait up to 4s for device init ... */
    +#define INIT_WAIT_MSECS 200 /* ... in 200ms increments */
    +
    +/* initialize the accelerometer */
    +static int accelerometer_init(void)
    +{
    + unsigned int total_msecs = INIT_TIMEOUT_MSECS;
    + unsigned int msecs_per_wait = INIT_WAIT_MSECS;
    + int ret = -EIO;
    +
    + spin_lock(&hdaps_lock);
    +
    + outb(0x13, 0x1610);
    + outb(0x01, 0x161f);
    + if (unlikely(!__wait_latch(0x161f, 0x00)))
    + goto out;
    +
    + /*
    + * The 0x3 value appears to only work on some thinkpads, such as the
    + * T42p. Others return 0x1.
    + *
    + * The 0x2 value occurs when the chip has been previously initialized.
    + */
    + if (unlikely(!__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 (unlikely(!__wait_latch(0x161f, 0x00)))
    + goto out;
    + if (unlikely(!__wait_latch(0x1611, 0x00)))
    + goto out;
    + if (unlikely(!__wait_latch(0x1612, 0x60)))
    + goto out;
    + if (unlikely(!__wait_latch(0x1613, 0x00)))
    + goto out;
    + outb(0x14, 0x1610);
    + outb(0x01, 0x1611);
    + outb(0x01, 0x161f);
    + if (unlikely(!__wait_latch(0x161f, 0x00)))
    + goto out;
    + outb(0x10, 0x1610);
    + outb(0xc8, 0x1611);
    + outb(0x00, 0x1612);
    + outb(0x02, 0x1613);
    + outb(0x01, 0x161f);
    + if (unlikely(!__wait_latch(0x161f, 0x00)))
    + goto out;
    + if (unlikely(!__request_refresh(REFRESH_SYNC)))
    + goto out;
    + if (unlikely(!__wait_latch(0x1611, 0x00)))
    + goto out;
    +
    + /* we have done our dance, now let's wait for the applause */
    + ret = -ENXIO;
    + while (total_msecs > 0) {
    + u8 ignored;
    +
    + /* a read of the device helps push it into action */
    + __accelerometer_readb_one(HDAPS_PORT_TEMP2, &ignored);
    + if (__wait_latch(0x1611, 0x02)) {
    + ret = 0;
    + break;
    + }
    + spin_unlock(&hdaps_lock);
    +
    + msleep(msecs_per_wait);
    + total_msecs -= msecs_per_wait;
    +
    + spin_lock(&hdaps_lock);
    + }
    +
    +out:
    + spin_unlock(&hdaps_lock);
    + return ret;
    +}
    +
    +
    +/* device class stuff */
    +
    +
    +static int hdaps_probe(struct device *dev)
    +{
    + int ret;
    +
    + ret = accelerometer_init();
    + if (unlikely(ret))
    + goto out;
    +
    + printk(KERN_INFO "hdaps: device initialized.\n");
    + return 0;
    +
    +out:
    + printk(KERN_WARNING "hdaps: device probe failed (ret=%d)!\n", ret);
    + return ret;
    +}
    +
    +static int hdaps_resume(struct device *dev, u32 level)
    +{
    + if (level == RESUME_ENABLE)
    + return accelerometer_init();
    + return 0;
    +}
    +
    +static struct device_driver hdaps_driver = {
    + .name = "hdaps",
    + .bus = &platform_bus_type,
    + .owner = THIS_MODULE,
    + .probe = hdaps_probe,
    + .resume = hdaps_resume
    +};
    +
    +
    +/* Input device stuff */
    +
    +static struct platform_device *pdev;
    +static struct input_dev hdaps_idev;
    +static struct timer_list hdaps_poll_timer;
    +static unsigned int hdaps_mousedev_threshold = 4;
    +static unsigned long hdaps_poll_ms = 25;
    +static int hdaps_mousedev_enabled;
    +static u16 rest_x;
    +static u16 rest_y;
    +
    +static void hdaps_calibrate(void)
    +{
    + int x, y, ret;
    +
    + ret = accelerometer_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
    + if (unlikely(ret))
    + return;
    +
    + rest_x = x;
    + rest_y = y;
    +}
    +
    +static void hdaps_mousedev_poll(unsigned long unused)
    +{
    + int movex, movey, x, y, ret;
    +
    + ret = accelerometer_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
    + if (unlikely(ret))
    + return;
    +
    + movex = rest_x - x;
    + movey = rest_y - y;
    + if (abs(movex) > hdaps_mousedev_threshold)
    + input_report_rel(&hdaps_idev, REL_Y, movex);
    + if (abs(movey) > hdaps_mousedev_threshold)
    + input_report_rel(&hdaps_idev, REL_X, movey);
    + input_sync(&hdaps_idev);
    +
    + mod_timer(&hdaps_poll_timer, jiffies + msecs_to_jiffies(hdaps_poll_ms));
    +}
    +
    +/*
    + * hdaps_mousedev_enable - enable the input class device. Caller must hold
    + * hdaps_lock.
    + */
    +static void hdaps_mousedev_enable(void)
    +{
    + /* calibrate the device before enabling */
    + hdaps_calibrate();
    +
    + init_input_dev(&hdaps_idev);
    + hdaps_idev.dev = &pdev->dev;
    + hdaps_idev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
    + hdaps_idev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
    + hdaps_idev.keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT);
    + input_register_device(&hdaps_idev);
    +
    + hdaps_mousedev_enabled = 1;
    +
    + init_timer(&hdaps_poll_timer);
    + hdaps_poll_timer.function = hdaps_mousedev_poll;
    + hdaps_poll_timer.expires = jiffies + msecs_to_jiffies(hdaps_poll_ms);
    + add_timer(&hdaps_poll_timer);
    +
    + printk(KERN_INFO "hdaps: input device enabled.\n");
    +}
    +
    +/*
    + * hdaps_mousedev_disable - disable the input class device. Caller must hold
    + * hdaps_lock.
    + */
    +static void hdaps_mousedev_disable(void)
    +{
    + if (!hdaps_mousedev_enabled)
    + return;
    +
    + hdaps_mousedev_enabled = 0;
    +
    + del_timer_sync(&hdaps_poll_timer);
    + input_unregister_device(&hdaps_idev);
    +}
    +
    +
    +/* Sysfs Files */
    +
    +static ssize_t hdaps_position_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + int ret, x, y;
    +
    + ret = accelerometer_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
    + if (unlikely(ret))
    + return ret;
    +
    + return sprintf(buf, "(%d,%d)\n", x, y);
    +}
    +static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
    +
    +static ssize_t hdaps_variance_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + int ret, x, y;
    +
    + ret = accelerometer_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y);
    + if (unlikely(ret))
    + return ret;
    +
    + return sprintf(buf, "(%d,%d)\n", x, y);
    +}
    +static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
    +
    +static ssize_t hdaps_temp_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + u8 temp;
    + int ret;
    +
    + ret = accelerometer_readb_one(HDAPS_PORT_TEMP, &temp);
    + if (unlikely(ret < 0))
    + return ret;
    +
    + return sprintf(buf, "%u\n", temp);
    +}
    +static DEVICE_ATTR(temp, 0444, hdaps_temp_show, NULL);
    +
    +static ssize_t hdaps_mousedev_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return sprintf(buf, "%d\n", hdaps_mousedev_enabled);
    +}
    +
    +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;
    +
    + spin_lock(&hdaps_lock);
    + if (enable == 1)
    + hdaps_mousedev_enable();
    + else if (enable == 0)
    + hdaps_mousedev_disable();
    + spin_unlock(&hdaps_lock);
    +
    + return count;
    +}
    +
    +static DEVICE_ATTR(mousedev, 0644, hdaps_mousedev_show, hdaps_mousedev_store);
    +
    +static ssize_t hdaps_calibrate_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + hdaps_calibrate();
    + return count;
    +}
    +static DEVICE_ATTR(calibrate, 0200, NULL, hdaps_calibrate_store);
    +
    +static ssize_t hdaps_threshold_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return sprintf(buf, "%u\n", hdaps_mousedev_threshold);
    +}
    +
    +static ssize_t hdaps_threshold_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + unsigned int threshold;
    +
    + if (sscanf(buf, "%u", &threshold) != 1 || threshold == 0)
    + return -EINVAL;
    + hdaps_mousedev_threshold = threshold;
    +
    + return count;
    +}
    +
    +static DEVICE_ATTR(mousedev_threshold, 0644, hdaps_threshold_show,
    + hdaps_threshold_store);
    +
    +static ssize_t hdaps_poll_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return sprintf(buf, "%lu\n", hdaps_poll_ms);
    +}
    +
    +static ssize_t hdaps_poll_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + unsigned int poll;
    +
    + if (sscanf(buf, "%u", &poll) != 1 || poll == 0)
    + return -EINVAL;
    + hdaps_poll_ms = poll;
    +
    + return count;
    +}
    +
    +static DEVICE_ATTR(mousedev_poll_ms, 0644, hdaps_poll_show, hdaps_poll_store);
    +
    +
    +/* Module stuff */
    +
    +static unsigned int mousedev;
    +module_param(mousedev, bool, 0);
    +MODULE_PARM_DESC(mousedev, "enable the input class device");
    +
    +static int hdaps_dmi_match(struct dmi_system_id *id)
    +{
    + printk(KERN_INFO "hdaps: %s detected.\n", id->ident);
    + return 0;
    +}
    +
    +static int __init hdaps_init(void)
    +{
    + int ret;
    +
    + /*
    + * Currently, DMI_MATCH(...,"pirate") will match "pirate*" so we only
    + * check for e.g. "ThinkPad T42" and not also "ThinkPad T42p".
    + */
    + struct dmi_system_id hdaps_whitelist[] = {
    + {
    + .ident = "IBM ThinkPad T41",
    + .callback = hdaps_dmi_match,
    + .matches = {
    + DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
    + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T41"),
    + }
    + },
    + {
    + .ident = "IBM ThinkPad T42",
    + .callback = hdaps_dmi_match,
    + .matches = {
    + DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
    + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T42"),
    + }
    + },
    + {
    + .ident = "IBM ThinkPad T43",
    + .callback = hdaps_dmi_match,
    + .matches = {
    + DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
    + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T43"),
    + }
    + },
    + { .matches = { DMI_MATCH(DMI_NONE, NULL) } }
    + };
    +
    + if (!dmi_check_system(hdaps_whitelist)) {
    + printk(KERN_WARNING "hdaps: supported laptop not found!\n");
    + ret = -ENODEV;
    + goto out;
    + }
    +
    + ret = driver_register(&hdaps_driver);
    + if (unlikely(ret))
    + goto out;
    +
    +#if defined(CONFIG_PNPACPI) || defined(CONFIG_PNPBIOS)
    + /*
    + * If CONFIG_PNPACPI or CONFIG_PNPBIOS is enabled, the ACPI layer is
    + * going to claim all motherboard resources. And there is no way for
    + * hdaps to repossess them--so we don't.
    + */
    + pdev = platform_device_register_simple("hdaps", -1, NULL, 0);
    +#else
    + {
    + struct resource res = { .name = "hdaps",
    + .start = HDAPS_LOW_PORT,
    + .end = HDAPS_HIGH_PORT,
    + .flags = IORESOURCE_IO,
    + .parent = &ioport_resource };
    +
    + pdev = platform_device_register_simple("hdaps", -1, &res, 1);
    + }
    +#endif
    + if (unlikely(IS_ERR(pdev))) {
    + ret = PTR_ERR(pdev);
    + goto out_driver;
    + }
    +
    + device_create_file(&pdev->dev, &dev_attr_position);
    + device_create_file(&pdev->dev, &dev_attr_variance);
    + device_create_file(&pdev->dev, &dev_attr_temp);
    + device_create_file(&pdev->dev, &dev_attr_calibrate);
    + device_create_file(&pdev->dev, &dev_attr_mousedev);
    + device_create_file(&pdev->dev, &dev_attr_mousedev_threshold);
    + device_create_file(&pdev->dev, &dev_attr_mousedev_poll_ms);
    +
    + if (mousedev)
    + hdaps_mousedev_enable();
    +
    + printk(KERN_INFO "hdaps: driver initialized.\n");
    + return 0;
    +
    +out_driver:
    + driver_unregister(&hdaps_driver);
    +out:
    + printk(KERN_WARNING "hdaps: driver init failed (ret=%d)!\n", ret);
    + return ret;
    +}
    +
    +static void __exit hdaps_exit(void)
    +{
    + hdaps_mousedev_disable();
    +
    + device_remove_file(&pdev->dev, &dev_attr_mousedev_poll_ms);
    + device_remove_file(&pdev->dev, &dev_attr_mousedev_threshold);
    + device_remove_file(&pdev->dev, &dev_attr_mousedev);
    + device_remove_file(&pdev->dev, &dev_attr_temp);
    + device_remove_file(&pdev->dev, &dev_attr_calibrate);
    + device_remove_file(&pdev->dev, &dev_attr_variance);
    + device_remove_file(&pdev->dev, &dev_attr_position);
    + platform_device_unregister(pdev);
    + driver_unregister(&hdaps_driver);
    +
    + printk(KERN_INFO "hdaps: driver unloaded successfully.\n");
    +}
    +
    +module_init(hdaps_init);
    +module_exit(hdaps_exit);
    +
    +MODULE_AUTHOR("Robert Love");
    +MODULE_DESCRIPTION("IBM Hard Drive Active Protection System (HDAPS) driver");
    +MODULE_LICENSE("GPL");
    diff -urN linux-2.6.13-rc6-mm2/drivers/hwmon/Kconfig linux/drivers/hwmon/Kconfig
    --- linux-2.6.13-rc6-mm2/drivers/hwmon/Kconfig 2005-08-26 11:06:49.000000000 -0400
    +++ linux/drivers/hwmon/Kconfig 2005-08-26 18:16:18.000000000 -0400
    @@ -411,6 +411,23 @@
               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-rc6-mm2/drivers/hwmon/Makefile linux/drivers/hwmon/Makefile
    --- linux-2.6.13-rc6-mm2/drivers/hwmon/Makefile 2005-08-26 11:06:50.000000000 -0400
    +++ linux/drivers/hwmon/Makefile 2005-08-26 18:10:27.000000000 -0400
    @@ -22,6 +22,7 @@
     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-rc6-mm2/MAINTAINERS linux/MAINTAINERS
    --- linux-2.6.13-rc6-mm2/MAINTAINERS 2005-08-26 11:06:58.000000000 -0400
    +++ linux/MAINTAINERS 2005-08-26 18:10:27.000000000 -0400
    @@ -984,6 +984,13 @@
     W: http://www.nyx.net/~arobinso
     S: Maintained
     
    +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
    +
     HFS FILESYSTEM
     P: Roman Zippel
     M: zippel@linux-m68k.org

    -
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