2 * Apple Motion Sensor driver
4 * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
5 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/of_platform.h>
27 #include <asm/pmac_pfunc.h>
31 /* There is only one motion sensor per machine */
34 static unsigned int verbose;
35 module_param(verbose, bool, 0644);
36 MODULE_PARM_DESC(verbose, "Show free falls and shocks in kernel output");
38 /* Call with ams_info.lock held! */
39 void ams_sensors(s8 *x, s8 *y, s8 *z)
41 u32 orient = ams_info.vflag? ams_info.orient1 : ams_info.orient2;
45 ams_info.get_xyz(y, x, z);
47 ams_info.get_xyz(x, y, z);
57 static ssize_t ams_show_current(struct device *dev,
58 struct device_attribute *attr, char *buf)
62 mutex_lock(&ams_info.lock);
63 ams_sensors(&x, &y, &z);
64 mutex_unlock(&ams_info.lock);
66 return snprintf(buf, PAGE_SIZE, "%d %d %d\n", x, y, z);
69 static DEVICE_ATTR(current, S_IRUGO, ams_show_current, NULL);
71 static void ams_handle_irq(void *data)
73 enum ams_irq irq = *((enum ams_irq *)data);
75 spin_lock(&ams_info.irq_lock);
77 ams_info.worker_irqs |= irq;
78 schedule_work(&ams_info.worker);
80 spin_unlock(&ams_info.irq_lock);
83 static enum ams_irq ams_freefall_irq_data = AMS_IRQ_FREEFALL;
84 static struct pmf_irq_client ams_freefall_client = {
86 .handler = ams_handle_irq,
87 .data = &ams_freefall_irq_data,
90 static enum ams_irq ams_shock_irq_data = AMS_IRQ_SHOCK;
91 static struct pmf_irq_client ams_shock_client = {
93 .handler = ams_handle_irq,
94 .data = &ams_shock_irq_data,
97 /* Once hard disk parking is implemented in the kernel, this function can
100 static void ams_worker(struct work_struct *work)
105 mutex_lock(&ams_info.lock);
107 spin_lock_irqsave(&ams_info.irq_lock, flags);
108 irqs_to_clear = ams_info.worker_irqs;
110 if (ams_info.worker_irqs & AMS_IRQ_FREEFALL) {
112 printk(KERN_INFO "ams: freefall detected!\n");
114 ams_info.worker_irqs &= ~AMS_IRQ_FREEFALL;
117 if (ams_info.worker_irqs & AMS_IRQ_SHOCK) {
119 printk(KERN_INFO "ams: shock detected!\n");
121 ams_info.worker_irqs &= ~AMS_IRQ_SHOCK;
124 spin_unlock_irqrestore(&ams_info.irq_lock, flags);
126 ams_info.clear_irq(irqs_to_clear);
128 mutex_unlock(&ams_info.lock);
131 /* Call with ams_info.lock held! */
132 int ams_sensor_attach(void)
137 /* Get orientation */
138 prop = of_get_property(ams_info.of_node, "orientation", NULL);
141 ams_info.orient1 = *prop;
142 ams_info.orient2 = *(prop + 1);
144 /* Register freefall interrupt handler */
145 result = pmf_register_irq_client(ams_info.of_node,
147 &ams_freefall_client);
151 /* Reset saved irqs */
152 ams_info.worker_irqs = 0;
154 /* Register shock interrupt handler */
155 result = pmf_register_irq_client(ams_info.of_node,
159 goto release_freefall;
162 ams_info.of_dev = of_platform_device_create(ams_info.of_node, "ams", NULL);
163 if (!ams_info.of_dev) {
168 /* Create attributes */
169 result = device_create_file(&ams_info.of_dev->dev, &dev_attr_current);
173 ams_info.vflag = !!(ams_info.get_vendor() & 0x10);
175 /* Init input device */
176 result = ams_input_init();
178 goto release_device_file;
182 device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
184 of_device_unregister(ams_info.of_dev);
186 pmf_unregister_irq_client(&ams_shock_client);
188 pmf_unregister_irq_client(&ams_freefall_client);
192 int __init ams_init(void)
194 struct device_node *np;
196 spin_lock_init(&ams_info.irq_lock);
197 mutex_init(&ams_info.lock);
198 INIT_WORK(&ams_info.worker, ams_worker);
200 #ifdef CONFIG_SENSORS_AMS_I2C
201 np = of_find_node_by_name(NULL, "accelerometer");
202 if (np && of_device_is_compatible(np, "AAPL,accelerometer_1"))
203 /* Found I2C motion sensor */
204 return ams_i2c_init(np);
207 #ifdef CONFIG_SENSORS_AMS_PMU
208 np = of_find_node_by_name(NULL, "sms");
209 if (np && of_device_is_compatible(np, "sms"))
210 /* Found PMU motion sensor */
211 return ams_pmu_init(np);
218 /* Remove input device */
221 /* Remove attributes */
222 device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
224 /* Shut down implementation */
227 /* Flush interrupt worker
229 * We do this after ams_info.exit(), because an interrupt might
230 * have arrived before disabling them.
232 flush_scheduled_work();
235 of_device_unregister(ams_info.of_dev);
238 pmf_unregister_irq_client(&ams_shock_client);
239 pmf_unregister_irq_client(&ams_freefall_client);
242 MODULE_AUTHOR("Stelian Pop, Michael Hanselmann");
243 MODULE_DESCRIPTION("Apple Motion Sensor driver");
244 MODULE_LICENSE("GPL");
246 module_init(ams_init);
247 module_exit(ams_exit);