linux/drivers/hwmon/hdaps.c

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/*
* 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 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/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 struct platform_device *pdev;
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;
}
/*
* 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;
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)
{
return hdaps_device_init();
}
static struct device_driver hdaps_driver = {
.name = "hdaps",
.bus = &platform_bus_type,
.owner = THIS_MODULE,
.probe = hdaps_probe,
.resume = hdaps_resume
};
/* Input class stuff */
static struct input_dev hdaps_idev = {
.name = "hdaps",
.evbit = { BIT(EV_ABS) },
.absbit = { BIT(ABS_X) | BIT(ABS_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;
input_report_abs(&hdaps_idev, ABS_X, x - rest_x);
input_report_abs(&hdaps_idev, ABS_Y, y - rest_y);
input_sync(&hdaps_idev);
mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
out:
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 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 hdaps_dmi_match(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 hdaps_dmi_match_invert(struct dmi_system_id *id)
{
hdaps_invert = 1;
printk(KERN_INFO "hdaps: inverting axis readings.\n");
return hdaps_dmi_match(id);
}
#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_NORMAL("ThinkPad R52"),
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"),
HDAPS_DMI_MATCH_NORMAL("ThinkPad X41 Tablet"),
HDAPS_DMI_MATCH_NORMAL("ThinkPad X41"),
{ .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;
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;
/* initial calibrate for the input device */
hdaps_calibrate();
/* initialize the input class */
hdaps_idev.dev = &pdev->dev;
input_register_device(&hdaps_idev);
/* start up our timer for the input device */
init_timer(&hdaps_timer);
hdaps_timer.function = hdaps_mousedev_poll;
hdaps_timer.expires = jiffies + HDAPS_POLL_PERIOD;
add_timer(&hdaps_timer);
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)
{
del_timer_sync(&hdaps_timer);
input_unregister_device(&hdaps_idev);
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(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");