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635 lines
16 KiB
C
635 lines
16 KiB
C
/*
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* drivers/hwmon/hdaps.c - driver for IBM's Hard Drive Active Protection System
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*
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* Copyright (C) 2005 Robert Love <rml@novell.com>
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* Copyright (C) 2005 Jesper Juhl <jesper.juhl@gmail.com>
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*
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* The HardDisk Active Protection System (hdaps) is present in IBM ThinkPads
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* starting with the R40, T41, and X40. It provides a basic two-axis
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* accelerometer and other data, such as the device's temperature.
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*
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* This driver is based on the document by Mark A. Smith available at
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* http://www.almaden.ibm.com/cs/people/marksmith/tpaps.html and a lot of trial
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* and error.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License v2 as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input-polldev.h>
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/dmi.h>
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#include <linux/jiffies.h>
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#include <asm/io.h>
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#define HDAPS_LOW_PORT 0x1600 /* first port used by hdaps */
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#define HDAPS_NR_PORTS 0x30 /* number of ports: 0x1600 - 0x162f */
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#define HDAPS_PORT_STATE 0x1611 /* device state */
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#define HDAPS_PORT_YPOS 0x1612 /* y-axis position */
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#define HDAPS_PORT_XPOS 0x1614 /* x-axis position */
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#define HDAPS_PORT_TEMP1 0x1616 /* device temperature, in Celsius */
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#define HDAPS_PORT_YVAR 0x1617 /* y-axis variance (what is this?) */
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#define HDAPS_PORT_XVAR 0x1619 /* x-axis variance (what is this?) */
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#define HDAPS_PORT_TEMP2 0x161b /* device temperature (again?) */
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#define HDAPS_PORT_UNKNOWN 0x161c /* what is this? */
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#define HDAPS_PORT_KMACT 0x161d /* keyboard or mouse activity */
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#define STATE_FRESH 0x50 /* accelerometer data is fresh */
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#define KEYBD_MASK 0x20 /* set if keyboard activity */
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#define MOUSE_MASK 0x40 /* set if mouse activity */
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#define KEYBD_ISSET(n) (!! (n & KEYBD_MASK)) /* keyboard used? */
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#define MOUSE_ISSET(n) (!! (n & MOUSE_MASK)) /* mouse used? */
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#define INIT_TIMEOUT_MSECS 4000 /* wait up to 4s for device init ... */
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#define INIT_WAIT_MSECS 200 /* ... in 200ms increments */
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#define HDAPS_POLL_INTERVAL 50 /* poll for input every 1/20s (50 ms)*/
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#define HDAPS_INPUT_FUZZ 4 /* input event threshold */
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#define HDAPS_INPUT_FLAT 4
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static struct platform_device *pdev;
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static struct input_polled_dev *hdaps_idev;
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static unsigned int hdaps_invert;
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static u8 km_activity;
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static int rest_x;
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static int rest_y;
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static DEFINE_MUTEX(hdaps_mtx);
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/*
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* __get_latch - Get the value from a given port. Callers must hold hdaps_mtx.
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*/
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static inline u8 __get_latch(u16 port)
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{
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return inb(port) & 0xff;
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}
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/*
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* __check_latch - Check a port latch for a given value. Returns zero if the
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* port contains the given value. Callers must hold hdaps_mtx.
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*/
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static inline int __check_latch(u16 port, u8 val)
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{
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if (__get_latch(port) == val)
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return 0;
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return -EINVAL;
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}
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/*
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* __wait_latch - Wait up to 100us for a port latch to get a certain value,
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* returning zero if the value is obtained. Callers must hold hdaps_mtx.
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*/
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static int __wait_latch(u16 port, u8 val)
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{
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unsigned int i;
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for (i = 0; i < 20; i++) {
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if (!__check_latch(port, val))
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return 0;
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udelay(5);
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}
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return -EIO;
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}
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/*
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* __device_refresh - request a refresh from the accelerometer. Does not wait
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* for refresh to complete. Callers must hold hdaps_mtx.
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*/
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static void __device_refresh(void)
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{
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udelay(200);
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if (inb(0x1604) != STATE_FRESH) {
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outb(0x11, 0x1610);
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outb(0x01, 0x161f);
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}
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}
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/*
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* __device_refresh_sync - request a synchronous refresh from the
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* accelerometer. We wait for the refresh to complete. Returns zero if
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* successful and nonzero on error. Callers must hold hdaps_mtx.
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*/
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static int __device_refresh_sync(void)
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{
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__device_refresh();
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return __wait_latch(0x1604, STATE_FRESH);
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}
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/*
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* __device_complete - indicate to the accelerometer that we are done reading
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* data, and then initiate an async refresh. Callers must hold hdaps_mtx.
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*/
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static inline void __device_complete(void)
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{
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inb(0x161f);
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inb(0x1604);
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__device_refresh();
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}
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/*
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* hdaps_readb_one - reads a byte from a single I/O port, placing the value in
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* the given pointer. Returns zero on success or a negative error on failure.
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* Can sleep.
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*/
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static int hdaps_readb_one(unsigned int port, u8 *val)
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{
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int ret;
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mutex_lock(&hdaps_mtx);
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/* do a sync refresh -- we need to be sure that we read fresh data */
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ret = __device_refresh_sync();
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if (ret)
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goto out;
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*val = inb(port);
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__device_complete();
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out:
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mutex_unlock(&hdaps_mtx);
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return ret;
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}
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/* __hdaps_read_pair - internal lockless helper for hdaps_read_pair(). */
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static int __hdaps_read_pair(unsigned int port1, unsigned int port2,
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int *x, int *y)
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{
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/* do a sync refresh -- we need to be sure that we read fresh data */
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if (__device_refresh_sync())
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return -EIO;
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*y = inw(port2);
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*x = inw(port1);
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km_activity = inb(HDAPS_PORT_KMACT);
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__device_complete();
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/* if hdaps_invert is set, negate the two values */
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if (hdaps_invert) {
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*x = -*x;
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*y = -*y;
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}
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return 0;
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}
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/*
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* hdaps_read_pair - reads the values from a pair of ports, placing the values
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* in the given pointers. Returns zero on success. Can sleep.
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*/
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static int hdaps_read_pair(unsigned int port1, unsigned int port2,
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int *val1, int *val2)
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{
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int ret;
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mutex_lock(&hdaps_mtx);
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ret = __hdaps_read_pair(port1, port2, val1, val2);
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mutex_unlock(&hdaps_mtx);
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return ret;
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}
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/*
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* hdaps_device_init - initialize the accelerometer. Returns zero on success
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* and negative error code on failure. Can sleep.
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*/
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static int hdaps_device_init(void)
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{
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int total, ret = -ENXIO;
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mutex_lock(&hdaps_mtx);
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outb(0x13, 0x1610);
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outb(0x01, 0x161f);
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if (__wait_latch(0x161f, 0x00))
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goto out;
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/*
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* Most ThinkPads return 0x01.
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*
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* Others--namely the R50p, T41p, and T42p--return 0x03. These laptops
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* have "inverted" axises.
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*
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* The 0x02 value occurs when the chip has been previously initialized.
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*/
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if (__check_latch(0x1611, 0x03) &&
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__check_latch(0x1611, 0x02) &&
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__check_latch(0x1611, 0x01))
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goto out;
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printk(KERN_DEBUG "hdaps: initial latch check good (0x%02x).\n",
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__get_latch(0x1611));
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outb(0x17, 0x1610);
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outb(0x81, 0x1611);
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outb(0x01, 0x161f);
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if (__wait_latch(0x161f, 0x00))
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goto out;
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if (__wait_latch(0x1611, 0x00))
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goto out;
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if (__wait_latch(0x1612, 0x60))
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goto out;
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if (__wait_latch(0x1613, 0x00))
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goto out;
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outb(0x14, 0x1610);
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outb(0x01, 0x1611);
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outb(0x01, 0x161f);
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if (__wait_latch(0x161f, 0x00))
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goto out;
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outb(0x10, 0x1610);
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outb(0xc8, 0x1611);
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outb(0x00, 0x1612);
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outb(0x02, 0x1613);
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outb(0x01, 0x161f);
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if (__wait_latch(0x161f, 0x00))
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goto out;
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if (__device_refresh_sync())
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goto out;
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if (__wait_latch(0x1611, 0x00))
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goto out;
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/* we have done our dance, now let's wait for the applause */
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for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
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int x, y;
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/* a read of the device helps push it into action */
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__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
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if (!__wait_latch(0x1611, 0x02)) {
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ret = 0;
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break;
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}
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msleep(INIT_WAIT_MSECS);
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}
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out:
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mutex_unlock(&hdaps_mtx);
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return ret;
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}
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/* Device model stuff */
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static int hdaps_probe(struct platform_device *dev)
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{
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int ret;
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ret = hdaps_device_init();
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if (ret)
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return ret;
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printk(KERN_INFO "hdaps: device successfully initialized.\n");
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return 0;
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}
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static int hdaps_resume(struct platform_device *dev)
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{
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return hdaps_device_init();
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}
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static struct platform_driver hdaps_driver = {
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.probe = hdaps_probe,
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.resume = hdaps_resume,
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.driver = {
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.name = "hdaps",
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.owner = THIS_MODULE,
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},
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};
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/*
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* hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_mtx.
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*/
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static void hdaps_calibrate(void)
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{
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__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
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}
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static void hdaps_mousedev_poll(struct input_polled_dev *dev)
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{
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struct input_dev *input_dev = dev->input;
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int x, y;
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mutex_lock(&hdaps_mtx);
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if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
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goto out;
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input_report_abs(input_dev, ABS_X, x - rest_x);
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input_report_abs(input_dev, ABS_Y, y - rest_y);
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input_sync(input_dev);
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out:
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mutex_unlock(&hdaps_mtx);
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}
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/* Sysfs Files */
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static ssize_t hdaps_position_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret, x, y;
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ret = hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y);
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if (ret)
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return ret;
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return sprintf(buf, "(%d,%d)\n", x, y);
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}
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static ssize_t hdaps_variance_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret, x, y;
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ret = hdaps_read_pair(HDAPS_PORT_XVAR, HDAPS_PORT_YVAR, &x, &y);
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if (ret)
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return ret;
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return sprintf(buf, "(%d,%d)\n", x, y);
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}
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static ssize_t hdaps_temp1_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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u8 temp;
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int ret;
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ret = hdaps_readb_one(HDAPS_PORT_TEMP1, &temp);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%u\n", temp);
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}
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static ssize_t hdaps_temp2_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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u8 temp;
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int ret;
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ret = hdaps_readb_one(HDAPS_PORT_TEMP2, &temp);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%u\n", temp);
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}
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static ssize_t hdaps_keyboard_activity_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", KEYBD_ISSET(km_activity));
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}
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static ssize_t hdaps_mouse_activity_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", MOUSE_ISSET(km_activity));
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}
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static ssize_t hdaps_calibrate_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "(%d,%d)\n", rest_x, rest_y);
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}
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static ssize_t hdaps_calibrate_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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mutex_lock(&hdaps_mtx);
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hdaps_calibrate();
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mutex_unlock(&hdaps_mtx);
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return count;
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}
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static ssize_t hdaps_invert_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%u\n", hdaps_invert);
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}
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static ssize_t hdaps_invert_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int invert;
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if (sscanf(buf, "%d", &invert) != 1 || (invert != 1 && invert != 0))
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return -EINVAL;
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hdaps_invert = invert;
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hdaps_calibrate();
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return count;
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}
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static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
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static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
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static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
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static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL);
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static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL);
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static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
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static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);
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static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store);
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static struct attribute *hdaps_attributes[] = {
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&dev_attr_position.attr,
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&dev_attr_variance.attr,
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&dev_attr_temp1.attr,
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&dev_attr_temp2.attr,
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&dev_attr_keyboard_activity.attr,
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&dev_attr_mouse_activity.attr,
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&dev_attr_calibrate.attr,
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&dev_attr_invert.attr,
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NULL,
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};
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static struct attribute_group hdaps_attribute_group = {
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.attrs = hdaps_attributes,
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};
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/* Module stuff */
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/* hdaps_dmi_match - found a match. return one, short-circuiting the hunt. */
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static int __init hdaps_dmi_match(const struct dmi_system_id *id)
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{
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printk(KERN_INFO "hdaps: %s detected.\n", id->ident);
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return 1;
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}
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/* hdaps_dmi_match_invert - found an inverted match. */
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static int __init hdaps_dmi_match_invert(const struct dmi_system_id *id)
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{
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hdaps_invert = 1;
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printk(KERN_INFO "hdaps: inverting axis readings.\n");
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return hdaps_dmi_match(id);
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}
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#define HDAPS_DMI_MATCH_NORMAL(vendor, model) { \
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.ident = vendor " " model, \
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.callback = hdaps_dmi_match, \
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.matches = { \
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DMI_MATCH(DMI_BOARD_VENDOR, vendor), \
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DMI_MATCH(DMI_PRODUCT_VERSION, model) \
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} \
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}
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#define HDAPS_DMI_MATCH_INVERT(vendor, model) { \
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.ident = vendor " " model, \
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.callback = hdaps_dmi_match_invert, \
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.matches = { \
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DMI_MATCH(DMI_BOARD_VENDOR, vendor), \
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DMI_MATCH(DMI_PRODUCT_VERSION, model) \
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} \
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}
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|
|
|
/* 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_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_DMI_MATCH_INVERT("LENOVO", "ThinkPad R61"),
|
|
HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T41p"),
|
|
HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T41"),
|
|
HDAPS_DMI_MATCH_INVERT("IBM", "ThinkPad T42p"),
|
|
HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T42"),
|
|
HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad T43"),
|
|
HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T60"),
|
|
HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61p"),
|
|
HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad T61"),
|
|
HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad X40"),
|
|
HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad X41"),
|
|
HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X60"),
|
|
HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61s"),
|
|
HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad X61"),
|
|
HDAPS_DMI_MATCH_NORMAL("IBM", "ThinkPad Z60m"),
|
|
HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61m"),
|
|
HDAPS_DMI_MATCH_INVERT("LENOVO", "ThinkPad Z61p"),
|
|
{ .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, 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");
|