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* Apple Motion Sensor driver
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* Copyright (C) 2005 Stelian Pop (stelian@popies.net)
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* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/of_platform.h>
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#include <asm/pmac_pfunc.h>
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/* There is only one motion sensor per machine */
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static unsigned int verbose;
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module_param(verbose, bool, 0644);
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MODULE_PARM_DESC(verbose, "Show free falls and shocks in kernel output");
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/* Call with ams_info.lock held! */
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void ams_sensors(s8 *x, s8 *y, s8 *z)
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u32 orient = ams_info.vflag? ams_info.orient1 : ams_info.orient2;
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ams_info.get_xyz(y, x, z);
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ams_info.get_xyz(x, y, z);
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static ssize_t ams_show_current(struct device *dev,
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struct device_attribute *attr, char *buf)
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mutex_lock(&ams_info.lock);
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ams_sensors(&x, &y, &z);
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mutex_unlock(&ams_info.lock);
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return snprintf(buf, PAGE_SIZE, "%d %d %d\n", x, y, z);
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static DEVICE_ATTR(current, S_IRUGO, ams_show_current, NULL);
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static void ams_handle_irq(void *data)
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enum ams_irq irq = *((enum ams_irq *)data);
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spin_lock(&ams_info.irq_lock);
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ams_info.worker_irqs |= irq;
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schedule_work(&ams_info.worker);
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spin_unlock(&ams_info.irq_lock);
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static enum ams_irq ams_freefall_irq_data = AMS_IRQ_FREEFALL;
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static struct pmf_irq_client ams_freefall_client = {
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.handler = ams_handle_irq,
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.data = &ams_freefall_irq_data,
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static enum ams_irq ams_shock_irq_data = AMS_IRQ_SHOCK;
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static struct pmf_irq_client ams_shock_client = {
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.handler = ams_handle_irq,
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.data = &ams_shock_irq_data,
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/* Once hard disk parking is implemented in the kernel, this function can
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static void ams_worker(struct work_struct *work)
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mutex_lock(&ams_info.lock);
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spin_lock_irqsave(&ams_info.irq_lock, flags);
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irqs_to_clear = ams_info.worker_irqs;
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if (ams_info.worker_irqs & AMS_IRQ_FREEFALL) {
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printk(KERN_INFO "ams: freefall detected!\n");
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ams_info.worker_irqs &= ~AMS_IRQ_FREEFALL;
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if (ams_info.worker_irqs & AMS_IRQ_SHOCK) {
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printk(KERN_INFO "ams: shock detected!\n");
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ams_info.worker_irqs &= ~AMS_IRQ_SHOCK;
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spin_unlock_irqrestore(&ams_info.irq_lock, flags);
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ams_info.clear_irq(irqs_to_clear);
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mutex_unlock(&ams_info.lock);
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/* Call with ams_info.lock held! */
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int ams_sensor_attach(void)
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/* Get orientation */
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prop = of_get_property(ams_info.of_node, "orientation", NULL);
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ams_info.orient1 = *prop;
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ams_info.orient2 = *(prop + 1);
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/* Register freefall interrupt handler */
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result = pmf_register_irq_client(ams_info.of_node,
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&ams_freefall_client);
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/* Reset saved irqs */
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ams_info.worker_irqs = 0;
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/* Register shock interrupt handler */
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result = pmf_register_irq_client(ams_info.of_node,
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goto release_freefall;
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ams_info.of_dev = of_platform_device_create(ams_info.of_node, "ams", NULL);
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if (!ams_info.of_dev) {
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/* Create attributes */
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result = device_create_file(&ams_info.of_dev->dev, &dev_attr_current);
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ams_info.vflag = !!(ams_info.get_vendor() & 0x10);
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/* Init input device */
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result = ams_input_init();
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goto release_device_file;
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device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
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of_device_unregister(ams_info.of_dev);
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pmf_unregister_irq_client(&ams_shock_client);
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pmf_unregister_irq_client(&ams_freefall_client);
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int __init ams_init(void)
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struct device_node *np;
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spin_lock_init(&ams_info.irq_lock);
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mutex_init(&ams_info.lock);
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INIT_WORK(&ams_info.worker, ams_worker);
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#ifdef CONFIG_SENSORS_AMS_I2C
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np = of_find_node_by_name(NULL, "accelerometer");
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if (np && of_device_is_compatible(np, "AAPL,accelerometer_1"))
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/* Found I2C motion sensor */
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return ams_i2c_init(np);
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#ifdef CONFIG_SENSORS_AMS_PMU
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np = of_find_node_by_name(NULL, "sms");
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if (np && of_device_is_compatible(np, "sms"))
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/* Found PMU motion sensor */
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return ams_pmu_init(np);
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void ams_sensor_detach(void)
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/* Remove input device */
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/* Remove attributes */
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device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
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/* Flush interrupt worker
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* We do this after ams_info.exit(), because an interrupt might
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* have arrived before disabling them.
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flush_scheduled_work();
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of_device_unregister(ams_info.of_dev);
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pmf_unregister_irq_client(&ams_shock_client);
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pmf_unregister_irq_client(&ams_freefall_client);
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static void __exit ams_exit(void)
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/* Shut down implementation */
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MODULE_AUTHOR("Stelian Pop, Michael Hanselmann");
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MODULE_DESCRIPTION("Apple Motion Sensor driver");
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MODULE_LICENSE("GPL");
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module_init(ams_init);
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module_exit(ams_exit);