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@@ -5,10 +5,10 @@
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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 the IBM ThinkPad
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- * T41, T42, T43, R51, and X40, at least. It provides a basic two-axis
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- * accelerometer and other data, such as the device's temperature.
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+ * T41, T42, T43, R50, R50p, R51, and X40, at least. It provides a basic
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+ * two-axis accelerometer and other data, such as the device's temperature.
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*
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- * Based on the document by Mark A. Smith available at
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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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@@ -36,12 +36,7 @@
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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 /* 0x1600 - 0x162f */
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-
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-#define STATE_FRESH 0x50 /* accelerometer data is fresh */
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-
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-#define REFRESH_ASYNC 0x00 /* do asynchronous refresh */
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-#define REFRESH_SYNC 0x01 /* do synchronous refresh */
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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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@@ -53,7 +48,7 @@
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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 HDAPS_READ_MASK 0xff /* some reads have the low 8 bits set */
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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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@@ -63,12 +58,11 @@
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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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-static struct platform_device *pdev;
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-static struct input_dev hdaps_idev;
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+#define HDAPS_POLL_PERIOD (HZ/20) /* poll for input every 1/20s */
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+#define HDAPS_INPUT_FUZZ 4 /* input event threshold */
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+
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static struct timer_list hdaps_timer;
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-static unsigned int hdaps_mousedev_threshold = 4;
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-static unsigned long hdaps_poll_ms = 50;
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-static unsigned int hdaps_mousedev;
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+static struct platform_device *pdev;
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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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@@ -81,14 +75,14 @@ static DECLARE_MUTEX(hdaps_sem);
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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) & HDAPS_READ_MASK;
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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. Callers must hold
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- * hdaps_sem. Returns zero if the port contains the given value.
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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_sem.
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*/
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-static inline unsigned int __check_latch(u16 port, u8 val)
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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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@@ -99,7 +93,7 @@ static inline unsigned int __check_latch(u16 port, u8 val)
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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_sem.
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*/
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-static unsigned int __wait_latch(u16 port, u8 val)
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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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@@ -109,59 +103,42 @@ static unsigned int __wait_latch(u16 port, u8 val)
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udelay(5);
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}
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- return -EINVAL;
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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.
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- *
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- * If sync is REFRESH_SYNC, we perform a synchronous refresh and will wait.
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- * Returns zero if successful and nonzero on error.
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- *
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- * If sync is REFRESH_ASYNC, we merely kick off a new refresh if the device is
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- * not up-to-date. Always returns zero.
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- *
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- * Callers must hold hdaps_sem.
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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_sem.
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*/
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-static int __device_refresh(unsigned int sync)
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+static void __device_refresh(void)
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{
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- u8 state;
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-
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- udelay(100);
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-
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- state = inb(0x1604);
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- if (state == STATE_FRESH)
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- return 0;
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-
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- outb(0x11, 0x1610);
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- outb(0x01, 0x161f);
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- if (sync == REFRESH_ASYNC)
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- return 0;
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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_sem.
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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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+ * __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_sem.
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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(REFRESH_ASYNC);
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-}
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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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- /* do a sync refresh -- we need to be sure that we read fresh data */
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- if (__device_refresh(REFRESH_SYNC))
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- return -EIO;
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-
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- *val = inb(port);
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- __device_complete();
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-
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- return 0;
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+ __device_refresh();
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}
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/*
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@@ -174,17 +151,26 @@ static int hdaps_readb_one(unsigned int port, u8 *val)
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int ret;
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down(&hdaps_sem);
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- ret = __hdaps_readb_one(port, val);
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- up(&hdaps_sem);
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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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+
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+ *val = inb(port);
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+ __device_complete();
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+
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+out:
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+ up(&hdaps_sem);
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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(REFRESH_SYNC))
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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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@@ -217,11 +203,13 @@ static int hdaps_read_pair(unsigned int port1, unsigned int port2,
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return ret;
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}
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-/* initialize the accelerometer */
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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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- unsigned int total_msecs = INIT_TIMEOUT_MSECS;
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- int ret = -ENXIO;
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+ int total, ret = -ENXIO;
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down(&hdaps_sem);
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@@ -231,8 +219,10 @@ static int hdaps_device_init(void)
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goto out;
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/*
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- * The 0x03 value appears to only work on some thinkpads, such as the
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- * T42p. Others return 0x01.
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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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@@ -267,24 +257,23 @@ static int hdaps_device_init(void)
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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(REFRESH_SYNC))
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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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- while (total_msecs > 0) {
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- u8 ignored;
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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_readb_one(HDAPS_PORT_UNKNOWN, &ignored);
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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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- total_msecs -= INIT_WAIT_MSECS;
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}
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out:
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@@ -293,96 +282,6 @@ out:
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}
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-/* Input class stuff */
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-
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-/*
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- * hdaps_calibrate - Zero out our "resting" values. Callers must hold hdaps_sem.
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- */
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-static void hdaps_calibrate(void)
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-{
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- int x, y;
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-
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- if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
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- return;
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-
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- rest_x = x;
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- rest_y = y;
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-}
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-
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-static void hdaps_mousedev_poll(unsigned long unused)
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-{
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- int x, y;
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-
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- /* Cannot sleep. Try nonblockingly. If we fail, try again later. */
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- if (down_trylock(&hdaps_sem)) {
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- mod_timer(&hdaps_timer,jiffies+msecs_to_jiffies(hdaps_poll_ms));
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- return;
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- }
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-
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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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-
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- x -= rest_x;
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- y -= rest_y;
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- if (abs(x) > hdaps_mousedev_threshold)
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- input_report_rel(&hdaps_idev, REL_X, x);
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- if (abs(y) > hdaps_mousedev_threshold)
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- input_report_rel(&hdaps_idev, REL_Y, y);
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- input_sync(&hdaps_idev);
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-
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- mod_timer(&hdaps_timer, jiffies + msecs_to_jiffies(hdaps_poll_ms));
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-
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-out:
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- up(&hdaps_sem);
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-}
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-
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-/*
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- * hdaps_mousedev_enable - enable the input class device. Can sleep.
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- */
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-static void hdaps_mousedev_enable(void)
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-{
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- down(&hdaps_sem);
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-
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- /* calibrate the device before enabling */
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- hdaps_calibrate();
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-
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- /* initialize the input class */
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- init_input_dev(&hdaps_idev);
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- hdaps_idev.dev = &pdev->dev;
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- hdaps_idev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
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- hdaps_idev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
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- hdaps_idev.keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT);
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- input_register_device(&hdaps_idev);
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-
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- /* start up our timer */
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- init_timer(&hdaps_timer);
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- hdaps_timer.function = hdaps_mousedev_poll;
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- hdaps_timer.expires = jiffies + msecs_to_jiffies(hdaps_poll_ms);
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- add_timer(&hdaps_timer);
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-
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- hdaps_mousedev = 1;
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-
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- up(&hdaps_sem);
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-
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- printk(KERN_INFO "hdaps: input device enabled.\n");
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-}
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-
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-/*
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- * hdaps_mousedev_disable - disable the input class device. Caller must hold
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- * hdaps_sem.
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- */
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-static void hdaps_mousedev_disable(void)
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-{
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- down(&hdaps_sem);
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- if (hdaps_mousedev) {
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- hdaps_mousedev = 0;
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- del_timer_sync(&hdaps_timer);
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- input_unregister_device(&hdaps_idev);
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- }
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- up(&hdaps_sem);
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-}
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-
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-
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/* Device model stuff */
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static int hdaps_probe(struct device *dev)
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@@ -412,6 +311,49 @@ static struct device_driver hdaps_driver = {
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.resume = hdaps_resume
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};
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+/* Input class stuff */
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+
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+static struct input_dev hdaps_idev = {
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+ .name = "hdaps",
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+ .evbit = { BIT(EV_ABS) },
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+ .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
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+ .absmin = { [ABS_X] = -256, [ABS_Y] = -256 },
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+ .absmax = { [ABS_X] = 256, [ABS_Y] = 256 },
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+ .absfuzz = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ },
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+ .absflat = { [ABS_X] = HDAPS_INPUT_FUZZ, [ABS_Y] = HDAPS_INPUT_FUZZ },
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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_sem.
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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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+
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+static void hdaps_mousedev_poll(unsigned long unused)
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+{
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+ int x, y;
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+
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+ /* Cannot sleep. Try nonblockingly. If we fail, try again later. */
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+ if (down_trylock(&hdaps_sem)) {
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+ mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD);
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+ return;
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+ }
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+
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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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+
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+ input_report_abs(&hdaps_idev, ABS_X, x - rest_x);
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+ input_report_abs(&hdaps_idev, ABS_Y, y - rest_y);
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+ input_sync(&hdaps_idev);
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+
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+ mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
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+
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+out:
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+ up(&hdaps_sem);
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+}
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+
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/* Sysfs Files */
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@@ -517,69 +459,6 @@ static ssize_t hdaps_invert_store(struct device *dev,
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return count;
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}
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-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 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 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(position, 0444, hdaps_position_show, NULL);
|
|
|
static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
|
|
|
static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
|
|
@@ -588,10 +467,6 @@ 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 DEVICE_ATTR(mousedev_poll_ms, 0644, hdaps_poll_show, hdaps_poll_store);
|
|
|
-static DEVICE_ATTR(mousedev_threshold, 0644, hdaps_threshold_show,
|
|
|
- hdaps_threshold_store);
|
|
|
|
|
|
static struct attribute *hdaps_attributes[] = {
|
|
|
&dev_attr_position.attr,
|
|
@@ -601,9 +476,6 @@ static struct attribute *hdaps_attributes[] = {
|
|
|
&dev_attr_keyboard_activity.attr,
|
|
|
&dev_attr_mouse_activity.attr,
|
|
|
&dev_attr_calibrate.attr,
|
|
|
- &dev_attr_mousedev.attr,
|
|
|
- &dev_attr_mousedev_threshold.attr,
|
|
|
- &dev_attr_mousedev_poll_ms.attr,
|
|
|
&dev_attr_invert.attr,
|
|
|
NULL,
|
|
|
};
|
|
@@ -619,7 +491,7 @@ static struct attribute_group hdaps_attribute_group = {
|
|
|
* 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
|
|
|
+ * I fixed this; the patch is 2.6-git. Once in a released 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)
|
|
@@ -668,6 +540,7 @@ static int __init hdaps_init(void)
|
|
|
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"),
|
|
|
{ .ident = NULL }
|
|
|
};
|
|
|
|
|
@@ -696,8 +569,18 @@ static int __init hdaps_init(void)
|
|
|
if (ret)
|
|
|
goto out_device;
|
|
|
|
|
|
- if (hdaps_mousedev)
|
|
|
- hdaps_mousedev_enable();
|
|
|
+ /* 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;
|
|
@@ -715,8 +598,8 @@ out:
|
|
|
|
|
|
static void __exit hdaps_exit(void)
|
|
|
{
|
|
|
- hdaps_mousedev_disable();
|
|
|
-
|
|
|
+ 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);
|
|
@@ -728,9 +611,6 @@ static void __exit hdaps_exit(void)
|
|
|
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");
|
|
|
|