Re: [RFC] Apple Motion Sensor driver

Michael Hanselmann
2006-07-03T22:45:47Z

Hello

On Mon, Jul 03, 2006 at 12:26:49AM +0200, Michael Hanselmann wrote:
> Below you find the latest revision of my AMS driver.

Here's another patch with lots of fixes. In random order:

- I2C crash: Moved client remove call, unable to test myself
- Z axis for mouse
- Removed config option for mouse
- Renamed "xyz" attribute to "current" after discussion with Johannes
Berg (johill). I don't like caching here, thus one attribute with
all values. Users might want to use it in scripts.
- Removed hdpark stuff for now
- Changed dependencies of SENSORS_AMS, moved to its own directory
- Set bustype correctly
- Cleaned up ams_sensors function

Is this better now?

Todo:
- Rewrite I2C attach code (I don't have the I2C hardware myself, thus I
can't do it right now)
- Maybe rewrite mouse emulation without kthread, but with workqueue (Any
comments on this?)

Thanks,
Michael

---
diff -Nrup --exclude-from linux-exclude-from linux-2.6.17-git21.orig/drivers/hwmon/ams/ams-core.c linux-2.6.17-git21/drivers/hwmon/ams/ams-core.c
--- linux-2.6.17-git21.orig/drivers/hwmon/ams/ams-core.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-git21/drivers/hwmon/ams/ams-core.c 2006-07-04 00:41:53.000000000 +0200
@@ -0,0 +1,242 @@
+/*
+ * Apple Motion Sensor driver
+ *
+ * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
+ * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <asm/pmac_pfunc.h>
+
+#include "ams.h"
+
+/* There is only one motion sensor per machine */
+struct ams ams;
+
+static unsigned int verbose;
+module_param(verbose, bool, 0644);
+MODULE_PARM_DESC(verbose, "Show free falls and shocks in kernel output");
+
+/* Call with lock held! */
+void ams_sensors(s8 *x, s8 *y, s8 *z)
+{
+ u32 orient = ams.vflag? ams.orient1 : ams.orient2;
+
+ if (orient & 0x80)
+ /* X and Y swapped */
+ ams.get_xyz(y, x, z);
+ else
+ ams.get_xyz(x, y, z);
+
+ if (orient & 0x04)
+ *z = ~(*z);
+ if (orient & 0x02)
+ *y = ~(*y);
+ if (orient & 0x01)
+ *x = ~(*x);
+}
+
+static ssize_t ams_show_current(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ s8 x, y, z;
+
+ mutex_lock(&ams.lock);
+ ams_sensors(&x, &y, &z);
+ mutex_unlock(&ams.lock);
+
+ return snprintf(buf, PAGE_SIZE, "%d %d %d\n", x, y, z);
+}
+
+static DEVICE_ATTR(current, S_IRUGO, ams_show_current, NULL);
+
+static void ams_handle_irq(void *data)
+{
+ enum ams_irq irq = *((enum ams_irq *)data);
+ unsigned long flags;
+
+ spin_lock_irqsave(&ams.irq_lock, flags);
+
+ ams.worker_irqs |= irq;
+ schedule_work(&ams.worker);
+
+ spin_unlock_irqrestore(&ams.irq_lock, flags);
+}
+
+static enum ams_irq ams_freefall_irq_data = AMS_IRQ_FREEFALL;
+static struct pmf_irq_client ams_freefall_client = {
+ .owner = THIS_MODULE,
+ .handler = ams_handle_irq,
+ .data = &ams_freefall_irq_data,
+};
+
+static enum ams_irq ams_shock_irq_data = AMS_IRQ_SHOCK;
+static struct pmf_irq_client ams_shock_client = {
+ .owner = THIS_MODULE,
+ .handler = ams_handle_irq,
+ .data = &ams_shock_irq_data,
+};
+
+/* Once hard disk parking is implemented in the kernel, this function can
+ * trigger it.
+ */
+static void ams_worker(void *data)
+{
+ mutex_lock(&ams.lock);
+
+ if (ams.has_device) {
+ if (ams.worker_irqs & AMS_IRQ_FREEFALL) {
+ if (verbose)
+ printk(KERN_INFO "ams: freefall detected!\n");
+
+ ams.worker_irqs &= ~AMS_IRQ_FREEFALL;
+ ams.clear_irq(AMS_IRQ_FREEFALL);
+ }
+
+ if (ams.worker_irqs & AMS_IRQ_SHOCK) {
+ if (verbose)
+ printk(KERN_INFO "ams: shock detected!\n");
+
+ ams.worker_irqs &= ~AMS_IRQ_SHOCK;
+ ams.clear_irq(AMS_IRQ_SHOCK);
+ }
+ }
+
+ mutex_unlock(&ams.lock);
+}
+
+/* Call with lock held! */
+int ams_sensor_attach(void)
+{
+ int result;
+ u32 *prop;
+
+ /* Get orientation */
+ prop = (u32*)get_property(ams.of_node, "orientation", NULL);
+ if (!prop)
+ return -ENODEV;
+ ams.orient1 = *prop;
+ ams.orient2 = *(prop + 1);
+
+ /* Register freefall interrupt handler */
+ result = pmf_register_irq_client(ams.of_node,
+ "accel-int-1",
+ &ams_freefall_client);
+ if (result < 0)
+ return -ENODEV;
+
+ /* Reset saved irqs */
+ ams.worker_irqs = 0;
+
+ /* Register shock interrupt handler */
+ result = pmf_register_irq_client(ams.of_node,
+ "accel-int-2",
+ &ams_shock_client);
+ if (result < 0) {
+ pmf_unregister_irq_client(&ams_freefall_client);
+ return -ENODEV;
+ }
+
+ /* Create device */
+ ams.of_dev = of_platform_device_create(ams.of_node, "ams", NULL);
+ if (!ams.of_dev) {
+ pmf_unregister_irq_client(&ams_shock_client);
+ pmf_unregister_irq_client(&ams_freefall_client);
+ return -ENODEV;
+ }
+
+ /* Create attributes */
+ device_create_file(&ams.of_dev->dev, &dev_attr_current);
+
+ ams.vflag = !!(ams.get_vendor() & 0x10);
+
+ /* Init mouse device */
+ ams_mouse_init();
+
+ return 0;
+}
+
+int __init ams_init(void)
+{
+ struct device_node *np;
+
+ spin_lock_init(&ams.irq_lock);
+ mutex_init(&ams.lock);
+ INIT_WORK(&ams.worker, ams_worker, NULL);
+
+#ifdef CONFIG_SENSORS_AMS_I2C
+ np = of_find_node_by_name(NULL, "accelerometer");
+ if (np && device_is_compatible(np, "AAPL,accelerometer_1"))
+ /* Found I2C motion sensor */
+ return ams_i2c_init(np);
+#endif
+
+#ifdef CONFIG_SENSORS_AMS_PMU
+ np = of_find_node_by_name(NULL, "sms");
+ if (np && device_is_compatible(np, "sms"))
+ /* Found PMU motion sensor */
+ return ams_pmu_init(np);
+#endif
+
+ printk(KERN_ERR "ams: No motion sensor found.\n");
+
+ return -ENODEV;
+}
+
+void ams_exit(void)
+{
+ mutex_lock(&ams.lock);
+
+ if (ams.has_device) {
+ /* Remove mouse device */
+ ams_mouse_exit();
+
+ /* Shut down implementation */
+ ams.exit();
+
+ /* Cancel interrupt worker
+ *
+ * We do this after ams.exit(), because an interrupt might
+ * have arrived before disabling them.
+ */
+ cancel_delayed_work(&ams.worker);
+ flush_scheduled_work();
+
+ /* Remove attributes */
+ device_remove_file(&ams.of_dev->dev, &dev_attr_current);
+
+ /* Remove device */
+ of_device_unregister(ams.of_dev);
+
+ /* Remove handler */
+ pmf_unregister_irq_client(&ams_shock_client);
+ pmf_unregister_irq_client(&ams_freefall_client);
+ }
+
+ mutex_unlock(&ams.lock);
+}
+
+MODULE_AUTHOR("Stelian Pop, Michael Hanselmann");
+MODULE_DESCRIPTION("Apple Motion Sensor driver");
+MODULE_LICENSE("GPL");
+
+module_init(ams_init);
+module_exit(ams_exit);
diff -Nrup --exclude-from linux-exclude-from linux-2.6.17-git21.orig/drivers/hwmon/ams/ams.h linux-2.6.17-git21/drivers/hwmon/ams/ams.h
--- linux-2.6.17-git21.orig/drivers/hwmon/ams/ams.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-git21/drivers/hwmon/ams/ams.h 2006-07-04 00:41:33.000000000 +0200
@@ -0,0 +1,72 @@
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <asm/of_device.h>
+
+enum ams_irq {
+ AMS_IRQ_FREEFALL = 0x01,
+ AMS_IRQ_SHOCK = 0x02,
+ AMS_IRQ_GLOBAL = 0x04,
+ AMS_IRQ_ALL =
+ AMS_IRQ_FREEFALL |
+ AMS_IRQ_SHOCK |
+ AMS_IRQ_GLOBAL,
+};
+
+struct ams {
+ /* Locks */
+ spinlock_t irq_lock;
+ struct mutex lock;
+
+ /* General properties */
+ struct device_node *of_node;
+ struct of_device *of_dev;
+ char has_device;
+ char vflag;
+ u32 orient1;
+ u32 orient2;
+
+ /* Interrupt worker */
+ struct work_struct worker;
+ u8 worker_irqs;
+
+ /* Implementation
+ *
+ * Only call these functions with the main lock held.
+ */
+ void (*exit)(void);
+
+ void (*get_xyz)(s8 *x, s8 *y, s8 *z);
+ u8 (*get_vendor)(void);
+
+ void (*clear_irq)(enum ams_irq reg);
+
+#ifdef CONFIG_SENSORS_AMS_I2C
+ /* I2C properties */
+ int i2c_bus;
+ int i2c_address;
+ struct i2c_client i2c_client;
+#endif
+
+ /* Mouse emulation */
+ struct task_struct *kthread;
+ struct input_dev *idev;
+ __u16 bustype;
+
+ /* calibrated null values */
+ int xcalib, ycalib, zcalib;
+};
+
+extern struct ams ams;
+
+extern void ams_sensors(s8 *x, s8 *y, s8 *z);
+extern int ams_sensor_attach(void);
+
+extern int ams_pmu_init(struct device_node *np);
+extern int ams_i2c_init(struct device_node *np);
+
+extern void ams_mouse_init(void);
+extern void ams_mouse_exit(void);
diff -Nrup --exclude-from linux-exclude-from linux-2.6.17-git21.orig/drivers/hwmon/ams/ams-i2c.c linux-2.6.17-git21/drivers/hwmon/ams/ams-i2c.c
--- linux-2.6.17-git21.orig/drivers/hwmon/ams/ams-i2c.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-git21/drivers/hwmon/ams/ams-i2c.c 2006-07-04 00:05:17.000000000 +0200
@@ -0,0 +1,289 @@
+/*
+ * Apple Motion Sensor driver (I2C variant)
+ *
+ * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
+ * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
+ *
+ * Clean room implementation based on the reverse engineered Mac OS X driver by
+ * Johannes Berg <johannes@sipsolutions.net>, documentation available at
+ * http://johannes.sipsolutions.net/PowerBook/Apple_Motion_Sensor_Specification
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include "ams.h"
+
+/* AMS registers */
+#define AMS_COMMAND 0x00 /* command register */
+#define AMS_STATUS 0x01 /* status register */
+#define AMS_CTRL1 0x02 /* read control 1 (number of values) */
+#define AMS_CTRL2 0x03 /* read control 2 (offset?) */
+#define AMS_CTRL3 0x04 /* read control 3 (size of each value?) */
+#define AMS_DATA1 0x05 /* read data 1 */
+#define AMS_DATA2 0x06 /* read data 2 */
+#define AMS_DATA3 0x07 /* read data 3 */
+#define AMS_DATA4 0x08 /* read data 4 */
+#define AMS_DATAX 0x20 /* data X */
+#define AMS_DATAY 0x21 /* data Y */
+#define AMS_DATAZ 0x22 /* data Z */
+#define AMS_FREEFALL 0x24 /* freefall int control */
+#define AMS_SHOCK 0x25 /* shock int control */
+#define AMS_SENSLOW 0x26 /* sensitivity low limit */
+#define AMS_SENSHIGH 0x27 /* sensitivity high limit */
+#define AMS_CTRLX 0x28 /* control X */
+#define AMS_CTRLY 0x29 /* control Y */
+#define AMS_CTRLZ 0x2A /* control Z */
+#define AMS_UNKNOWN1 0x2B /* unknown 1 */
+#define AMS_UNKNOWN2 0x2C /* unknown 2 */
+#define AMS_UNKNOWN3 0x2D /* unknown 3 */
+#define AMS_VENDOR 0x2E /* vendor */
+
+/* AMS commands - use with the AMS_COMMAND register */
+enum ams_i2c_cmd {
+ AMS_CMD_NOOP = 0,
+ AMS_CMD_VERSION,
+ AMS_CMD_READMEM,
+ AMS_CMD_WRITEMEM,
+ AMS_CMD_ERASEMEM,
+ AMS_CMD_READEE,
+ AMS_CMD_WRITEEE,
+ AMS_CMD_RESET,
+ AMS_CMD_START,
+};
+
+static int ams_i2c_attach(struct i2c_adapter *adapter);
+static int ams_i2c_detach(struct i2c_adapter *adapter);
+
+static struct i2c_driver ams_i2c_driver = {
+ .driver = {
+ .name = "ams",
+ .owner = THIS_MODULE,
+ },
+ .attach_adapter = ams_i2c_attach,
+ .detach_adapter = ams_i2c_detach,
+};
+
+static s32 ams_i2c_read(u8 reg)
+{
+ return i2c_smbus_read_byte_data(&ams.i2c_client, reg);
+}
+
+static int ams_i2c_write(u8 reg, u8 value)
+{
+ return i2c_smbus_write_byte_data(&ams.i2c_client, reg, value);
+}
+
+static int ams_i2c_cmd(enum ams_i2c_cmd cmd)
+{
+ s32 result;
+ int i;
+
+ ams_i2c_write(AMS_COMMAND, cmd);
+ for (i = 0; i < 10; i++) {
+ mdelay(5);
+ result = ams_i2c_read(AMS_COMMAND);
+ if (result == 0 || result & 0x80)
+ return 0;
+ }
+ return -1;
+}
+
+static void ams_i2c_set_irq(enum ams_irq reg, char enable)
+{
+ if (reg & AMS_IRQ_FREEFALL) {
+ u8 val = ams_i2c_read(AMS_CTRLX);
+ if (enable) val |= 0x80;
+ else val &= ~0x80;
+ ams_i2c_write(AMS_CTRLX, val);
+ }
+
+ if (reg & AMS_IRQ_SHOCK) {
+ u8 val = ams_i2c_read(AMS_CTRLY);
+ if (enable) val |= 0x80;
+ else val &= ~0x80;
+ ams_i2c_write(AMS_CTRLY, val);
+ }
+
+ if (reg & AMS_IRQ_GLOBAL) {
+ u8 val = ams_i2c_read(AMS_CTRLZ);
+ if (enable) val |= 0x80;
+ else val &= ~0x80;
+ ams_i2c_write(AMS_CTRLZ, val);
+ }
+}
+
+static void ams_i2c_clear_irq(enum ams_irq reg)
+{
+ if (reg & AMS_IRQ_FREEFALL)
+ ams_i2c_write(AMS_FREEFALL, 0);
+
+ if (reg & AMS_IRQ_SHOCK)
+ ams_i2c_write(AMS_SHOCK, 0);
+}
+
+static u8 ams_i2c_get_vendor(void)
+{
+ return ams_i2c_read(AMS_VENDOR);
+}
+
+static void ams_i2c_get_xyz(s8 *x, s8 *y, s8 *z)
+{
+ *x = ams_i2c_read(AMS_DATAX);
+ *y = ams_i2c_read(AMS_DATAY);
+ *z = ams_i2c_read(AMS_DATAZ);
+}
+
+static int ams_i2c_attach(struct i2c_adapter *adapter)
+{
+ unsigned long bus;
+ int vmaj, vmin;
+ int result;
+
+ /* There can be only one */
+ if (unlikely(ams.has_device))
+ return -ENODEV;
+
+ if (strncmp(adapter->name, "uni-n", 5))
+ return -ENODEV;
+
+ bus = simple_strtoul(adapter->name + 6, NULL, 10);
+ if (bus != ams.i2c_bus)
+ return -ENODEV;
+
+ ams.i2c_client.addr = ams.i2c_address;
+ ams.i2c_client.adapter = adapter;
+ ams.i2c_client.driver = &ams_i2c_driver;
+ strcpy(ams.i2c_client.name, "Apple Motion Sensor");
+
+ if (ams_i2c_cmd(AMS_CMD_RESET)) {
+ printk(KERN_INFO "ams: Failed to reset the device\n");
+ return -ENODEV;
+ }
+
+ if (ams_i2c_cmd(AMS_CMD_START)) {
+ printk(KERN_INFO "ams: Failed to start the device\n");
+ return -ENODEV;
+ }
+
+ /* get version/vendor information */
+ ams_i2c_write(AMS_CTRL1, 0x02);
+ ams_i2c_write(AMS_CTRL2, 0x85);
+ ams_i2c_write(AMS_CTRL3, 0x01);
+
+ ams_i2c_cmd(AMS_CMD_READMEM);
+
+ vmaj = ams_i2c_read(AMS_DATA1);
+ vmin = ams_i2c_read(AMS_DATA2);
+ if (vmaj != 1 || vmin != 52) {
+ printk(KERN_INFO "ams: Incorrect device version (%d.%d)\n",
+ vmaj, vmin);
+ return -ENODEV;
+ }
+
+ ams_i2c_cmd(AMS_CMD_VERSION);
+
+ vmaj = ams_i2c_read(AMS_DATA1);
+ vmin = ams_i2c_read(AMS_DATA2);
+ if (vmaj != 0 || vmin != 1) {
+ printk(KERN_INFO "ams: Incorrect firmware version (%d.%d)\n",
+ vmaj, vmin);
+ return -ENODEV;
+ }
+
+ /* Disable interrupts */
+ ams_i2c_set_irq(AMS_IRQ_ALL, 0);
+
+ result = ams_sensor_attach();
+ if (result < 0)
+ return result;
+
+ /* Set default values */
+ ams_i2c_write(AMS_SENSLOW, 0x15);
+ ams_i2c_write(AMS_SENSHIGH, 0x60);
+ ams_i2c_write(AMS_CTRLX, 0x08);
+ ams_i2c_write(AMS_CTRLY, 0x0F);
+ ams_i2c_write(AMS_CTRLZ, 0x4F);
+ ams_i2c_write(AMS_UNKNOWN1, 0x14);
+
+ /* Clear interrupts */
+ ams_i2c_clear_irq(AMS_IRQ_ALL);
+
+ ams.has_device = 1;
+
+ /* Enable interrupts */
+ ams_i2c_set_irq(AMS_IRQ_ALL, 1);
+
+ printk(KERN_INFO "ams: Found I2C based motion sensor\n");
+
+ return 0;
+}
+
+static int ams_i2c_detach(struct i2c_adapter *adapter)
+{
+ /* Disable interrupts */
+ ams_i2c_set_irq(AMS_IRQ_ALL, 0);
+
+ /* Clear interrupts */
+ ams_i2c_clear_irq(AMS_IRQ_ALL);
+
+ i2c_detach_client(&ams.i2c_client);
+
+ ams.has_device = 0;
+
+ printk(KERN_INFO "ams: Unloading\n");
+
+ return 0;
+}
+
+static void ams_i2c_exit(void)
+{
+ i2c_del_driver(&ams_i2c_driver);
+}
+
+int __init ams_i2c_init(struct device_node *np)
+{
+ char *tmp_bus;
+ int result;
+ u32 *prop;
+
+ mutex_lock(&ams.lock);
+
+ /* Set implementation stuff */
+ ams.of_node = np;
+ ams.exit = ams_i2c_exit;
+ ams.get_vendor = ams_i2c_get_vendor;
+ ams.get_xyz = ams_i2c_get_xyz;
+ ams.clear_irq = ams_i2c_clear_irq;
+ ams.bustype = BUS_I2C;
+
+ /* look for bus either by path or using "reg" */
+ prop = (u32*)get_property(ams.of_node, "reg", NULL);
+ if (!prop) {
+ result = -ENODEV;
+
+ goto exit;
+ }
+
+ tmp_bus = strstr(ams.of_node->full_name, "/i2c-bus@");
+ if (tmp_bus)
+ ams.i2c_bus = *(tmp_bus + 9) - '0';
+ else
+ ams.i2c_bus = ((*prop) >> 8) & 0x0f;
+ ams.i2c_address = ((*prop) & 0xff) >> 1;
+
+ result = i2c_add_driver(&ams_i2c_driver);
+
+exit:
+ mutex_unlock(&ams.lock);
+
+ return result;
+}
diff -Nrup --exclude-from linux-exclude-from linux-2.6.17-git21.orig/drivers/hwmon/ams/ams-mouse.c linux-2.6.17-git21/drivers/hwmon/ams/ams-mouse.c
--- linux-2.6.17-git21.orig/drivers/hwmon/ams/ams-mouse.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-git21/drivers/hwmon/ams/ams-mouse.c 2006-07-03 21:48:07.000000000 +0200
@@ -0,0 +1,145 @@
+/*
+ * Apple Motion Sensor driver (mouse emulation)
+ *
+ * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
+ * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include "ams.h"
+
+static unsigned int mouse;
+module_param(mouse, bool, 0644);
+MODULE_PARM_DESC(mouse, "Enable the input class device on module load");
+
+static int ams_mouse_kthread(void *data)
+{
+ s8 x, y, z;
+
+ while (!kthread_should_stop()) {
+ mutex_lock(&ams.lock);
+
+ ams_sensors(&x, &y, &z);
+
+ input_report_abs(ams.idev, ABS_X, x - ams.xcalib);
+ input_report_abs(ams.idev, ABS_Y, y - ams.ycalib);
+ input_report_abs(ams.idev, ABS_Z, z - ams.zcalib);
+
+ input_sync(ams.idev);
+
+ mutex_unlock(&ams.lock);
+
+ msleep(25);
+ }
+
+ return 0;
+}
+
+/* Call with lock held! */
+static void ams_mouse_enable(void)
+{
+ s8 x, y, z;
+
+ if (ams.idev)
+ return;
+
+ ams_sensors(&x, &y, &z);
+ ams.xcalib = x;
+ ams.ycalib = y;
+ ams.zcalib = z;
+
+ ams.idev = input_allocate_device();
+ if (!ams.idev)
+ return;
+
+ ams.idev->name = "Apple Motion Sensor";
+ ams.idev->id.bustype = ams.bustype;
+ ams.idev->id.vendor = 0;
+ ams.idev->cdev.dev = &ams.of_dev->dev;
+
+ input_set_abs_params(ams.idev, ABS_X, -50, 50, 3, 0);
+ input_set_abs_params(ams.idev, ABS_Y, -50, 50, 3, 0);
+ input_set_abs_params(ams.idev, ABS_Z, -50, 50, 3, 0);
+
+ set_bit(EV_ABS, ams.idev->evbit);
+ set_bit(EV_KEY, ams.idev->evbit);
+
+ if (input_register_device(ams.idev)) {
+ input_free_device(ams.idev);
+ ams.idev = NULL;
+ return;
+ }
+
+ ams.kthread = kthread_run(ams_mouse_kthread, NULL, "kams");
+ if (IS_ERR(ams.kthread)) {
+ input_unregister_device(ams.idev);
+ ams.idev = NULL;
+ return;
+ }
+}
+
+/* Call with lock held! */
+static void ams_mouse_disable(void)
+{
+ if (ams.idev) {
+ kthread_stop(ams.kthread);
+ input_unregister_device(ams.idev);
+ ams.idev = NULL;
+ }
+}
+
+static ssize_t ams_mouse_show_mouse(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", mouse);
+}
+
+static ssize_t ams_mouse_store_mouse(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ if (sscanf(buf, "%d\n", &mouse) != 1)
+ return -EINVAL;
+
+ mouse = !!mouse;
+
+ mutex_lock(&ams.lock);
+
+ if (mouse)
+ ams_mouse_enable();
+ else
+ ams_mouse_disable();
+
+ mutex_unlock(&ams.lock);
+
+ return count;
+}
+
+static DEVICE_ATTR(mouse, S_IRUGO | S_IWUSR,
+ ams_mouse_show_mouse, ams_mouse_store_mouse);
+
+/* Call with lock held! */
+void ams_mouse_init()
+{
+ device_create_file(&ams.of_dev->dev, &dev_attr_mouse);
+
+ if (mouse)
+ ams_mouse_enable();
+}
+
+/* Call with lock held! */
+void ams_mouse_exit()
+{
+ ams_mouse_disable();
+ device_remove_file(&ams.of_dev->dev, &dev_attr_mouse);
+}
diff -Nrup --exclude-from linux-exclude-from linux-2.6.17-git21.orig/drivers/hwmon/ams/ams-pmu.c linux-2.6.17-git21/drivers/hwmon/ams/ams-pmu.c
--- linux-2.6.17-git21.orig/drivers/hwmon/ams/ams-pmu.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-git21/drivers/hwmon/ams/ams-pmu.c 2006-07-03 21:45:16.000000000 +0200
@@ -0,0 +1,202 @@
+/*
+ * Apple Motion Sensor driver (PMU variant)
+ *
+ * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+
+#include "ams.h"
+
+/* Attitude */
+#define AMS_X 0x00
+#define AMS_Y 0x01
+#define AMS_Z 0x02
+
+/* Not exactly known, maybe chip vendor */
+#define AMS_VENDOR 0x03
+
+/* Freefall registers */
+#define AMS_FF_CLEAR 0x04
+#define AMS_FF_ENABLE 0x05
+#define AMS_FF_LOW_LIMIT 0x06
+#define AMS_FF_DEBOUNCE 0x07
+
+/* Shock registers */
+#define AMS_SHOCK_CLEAR 0x08
+#define AMS_SHOCK_ENABLE 0x09
+#define AMS_SHOCK_HIGH_LIMIT 0x0a
+#define AMS_SHOCK_DEBOUNCE 0x0b
+
+/* Global interrupt and power control register */
+#define AMS_CONTROL 0x0c
+
+static u8 ams_pmu_cmd;
+
+static void ams_pmu_req_complete(struct adb_request *req)
+{
+ complete((struct completion *)req->arg);
+}
+
+/* Only call this function from task context */
+static void ams_pmu_set_register(u8 reg, u8 value)
+{
+ static struct adb_request req;
+ DECLARE_COMPLETION(req_complete);
+
+ req.arg = &req_complete;
+ if (pmu_request(&req, ams_pmu_req_complete, 4, ams_pmu_cmd, 0x00, reg, value))
+ return;
+
+ wait_for_completion(&req_complete);
+}
+
+/* Only call this function from task context */
+static u8 ams_pmu_get_register(u8 reg)
+{
+ static struct adb_request req;
+ DECLARE_COMPLETION(req_complete);
+
+ req.arg = &req_complete;
+ if (pmu_request(&req, ams_pmu_req_complete, 3, ams_pmu_cmd, 0x01, reg))
+ return 0;
+
+ wait_for_completion(&req_complete);
+
+ if (req.reply_len > 0)
+ return req.reply[0];
+ else
+ return 0;
+}
+
+/* Enables or disables the specified interrupts */
+static void ams_pmu_set_irq(enum ams_irq reg, char enable)
+{
+ if (reg & AMS_IRQ_FREEFALL) {
+ u8 val = ams_pmu_get_register(AMS_FF_ENABLE);
+ if (enable) val |= 0x80;
+ else val &= ~0x80;
+ ams_pmu_set_register(AMS_FF_ENABLE, val);
+ }
+
+ if (reg & AMS_IRQ_SHOCK) {
+ u8 val = ams_pmu_get_register(AMS_SHOCK_ENABLE);
+ if (enable) val |= 0x80;
+ else val &= ~0x80;
+ ams_pmu_set_register(AMS_SHOCK_ENABLE, val);
+ }
+
+ if (reg & AMS_IRQ_GLOBAL) {
+ u8 val = ams_pmu_get_register(AMS_CONTROL);
+ if (enable) val |= 0x80;
+ else val &= ~0x80;
+ ams_pmu_set_register(AMS_CONTROL, val);
+ }
+}
+
+static void ams_pmu_clear_irq(enum ams_irq reg)
+{
+ if (reg & AMS_IRQ_FREEFALL)
+ ams_pmu_set_register(AMS_FF_CLEAR, 0x00);
+
+ if (reg & AMS_IRQ_SHOCK)
+ ams_pmu_set_register(AMS_SHOCK_CLEAR, 0x00);
+}
+
+static u8 ams_pmu_get_vendor(void)
+{
+ return ams_pmu_get_register(AMS_VENDOR);
+}
+
+static void ams_pmu_get_xyz(s8 *x, s8 *y, s8 *z)
+{
+ *x = ams_pmu_get_register(AMS_X);
+ *y = ams_pmu_get_register(AMS_Y);
+ *z = ams_pmu_get_register(AMS_Z);
+}
+
+static void ams_pmu_exit(void)
+{
+ /* Disable interrupts */
+ ams_pmu_set_irq(AMS_IRQ_ALL, 0);
+
+ /* Clear interrupts */
+ ams_pmu_clear_irq(AMS_IRQ_ALL);
+
+ ams.has_device = 0;
+
+ printk(KERN_INFO "ams: Unloading\n");
+}
+
+/* Call with lock held! */
+int __init ams_pmu_init(struct device_node *np)
+{
+ u32 *prop;
+ int result;
+
+ mutex_lock(&ams.lock);
+
+ /* Set implementation stuff */
+ ams.of_node = np;
+ ams.exit = ams_pmu_exit;
+ ams.get_vendor = ams_pmu_get_vendor;
+ ams.get_xyz = ams_pmu_get_xyz;
+ ams.clear_irq = ams_pmu_clear_irq;
+ ams.bustype = BUS_HOST;
+
+ /* Get PMU command, should be 0x4e, but we can never know */
+ prop = (u32*)get_property(ams.of_node, "reg", NULL);
+ if (!prop) {
+ result = -ENODEV;
+ goto exit;
+ }
+ ams_pmu_cmd = ((*prop) >> 8) & 0xff;
+
+ /* Disable interrupts */
+ ams_pmu_set_irq(AMS_IRQ_ALL, 0);
+
+ /* Clear interrupts */
+ ams_pmu_clear_irq(AMS_IRQ_ALL);
+
+ result = ams_sensor_attach();
+ if (result < 0)
+ goto exit;
+
+ /* Set default values */
+ ams_pmu_set_register(AMS_FF_LOW_LIMIT, 0x15);
+ ams_pmu_set_register(AMS_FF_ENABLE, 0x08);
+ ams_pmu_set_register(AMS_FF_DEBOUNCE, 0x14);
+
+ ams_pmu_set_register(AMS_SHOCK_HIGH_LIMIT, 0x60);
+ ams_pmu_set_register(AMS_SHOCK_ENABLE, 0x0f);
+ ams_pmu_set_register(AMS_SHOCK_DEBOUNCE, 0x14);
+
+ ams_pmu_set_register(AMS_CONTROL, 0x4f);
+
+ /* Clear interrupts */
+ ams_pmu_clear_irq(AMS_IRQ_ALL);
+
+ ams.has_device = 1;
+
+ /* Enable interrupts */
+ ams_pmu_set_irq(AMS_IRQ_ALL, 1);
+
+ printk(KERN_INFO "ams: Found PMU based motion sensor\n");
+
+ result = 0;
+
+exit:
+ mutex_unlock(&ams.lock);
+
+ return result;
+}
diff -Nrup --exclude-from linux-exclude-from linux-2.6.17-git21.orig/drivers/hwmon/ams/Makefile linux-2.6.17-git21/drivers/hwmon/ams/Makefile
--- linux-2.6.17-git21.orig/drivers/hwmon/ams/Makefile 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-git21/drivers/hwmon/ams/Makefile 2006-07-04 00:42:44.000000000 +0200
@@ -0,0 +1,8 @@
+#
+# Makefile for Apple Motion Sensor driver
+#
+
+ams-y := ams-core.o ams-mouse.o
+ams-$(CONFIG_SENSORS_AMS_PMU) += ams-pmu.o
+ams-$(CONFIG_SENSORS_AMS_I2C) += ams-i2c.o
+obj-$(CONFIG_SENSORS_AMS) += ams.o
diff -Nrup --exclude-from linux-exclude-from linux-2.6.17-git21.orig/drivers/hwmon/Kconfig linux-2.6.17-git21/drivers/hwmon/Kconfig
--- linux-2.6.17-git21.orig/drivers/hwmon/Kconfig 2006-07-04 00:29:56.000000000 +0200
+++ linux-2.6.17-git21/drivers/hwmon/Kconfig 2006-07-04 00:12:23.000000000 +0200
@@ -94,6 +94,28 @@ config SENSORS_ADM9240
This driver can also be built as a module. If so, the module
will be called adm9240.

+config SENSORS_AMS
+ tristate "Apple Motion Sensor driver"
+ depends on HWMON && PPC_PMAC && INPUT && EXPERIMENTAL
+ default y
+ help
+ Support for the motion sensor included in PowerBooks.
+
+config SENSORS_AMS_PMU
+ bool "PMU variant"
+ depends on SENSORS_AMS && ADB_PMU
+ default y
+ help
+ PMU variant of motion sensor, found in late 2005 PowerBooks.
+
+config SENSORS_AMS_I2C
+ bool "I2C variant"
+ depends on SENSORS_AMS && I2C
+ default y
+ help
+ I2C variant of motion sensor, found in early 2005 PowerBooks and
+ iBooks.
+
config SENSORS_ASB100
tristate "Asus ASB100 Bach"
depends on HWMON && I2C && EXPERIMENTAL
diff -Nrup --exclude-from linux-exclude-from linux-2.6.17-git21.orig/drivers/hwmon/Makefile linux-2.6.17-git21/drivers/hwmon/Makefile
--- linux-2.6.17-git21.orig/drivers/hwmon/Makefile 2006-07-04 00:29:56.000000000 +0200
+++ linux-2.6.17-git21/drivers/hwmon/Makefile 2006-07-03 20:15:50.000000000 +0200
@@ -18,6 +18,7 @@ obj-$(CONFIG_SENSORS_ADM1025) += adm1025
obj-$(CONFIG_SENSORS_ADM1026) += adm1026.o
obj-$(CONFIG_SENSORS_ADM1031) += adm1031.o
obj-$(CONFIG_SENSORS_ADM9240) += adm9240.o
+obj-$(CONFIG_SENSORS_AMS) += ams/
obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
obj-$(CONFIG_SENSORS_F71805F) += f71805f.o