1/*
2 * Apple Motion Sensor driver
3 *
4 * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
5 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
6 *
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.
11 *
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.
16 *
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.
20 */
21
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>
28
29#include "ams.h"
30
31/* There is only one motion sensor per machine */
32struct ams ams_info;
33
34static bool verbose;
35module_param(verbose, bool, 0644);
36MODULE_PARM_DESC(verbose, "Show free falls and shocks in kernel output");
37
38/* Call with ams_info.lock held! */
39void ams_sensors(s8 *x, s8 *y, s8 *z)
40{
41	u32 orient = ams_info.vflag? ams_info.orient1 : ams_info.orient2;
42
43	if (orient & 0x80)
44		/* X and Y swapped */
45		ams_info.get_xyz(y, x, z);
46	else
47		ams_info.get_xyz(x, y, z);
48
49	if (orient & 0x04)
50		*z = ~(*z);
51	if (orient & 0x02)
52		*y = ~(*y);
53	if (orient & 0x01)
54		*x = ~(*x);
55}
56
57static ssize_t ams_show_current(struct device *dev,
58	struct device_attribute *attr, char *buf)
59{
60	s8 x, y, z;
61
62	mutex_lock(&ams_info.lock);
63	ams_sensors(&x, &y, &z);
64	mutex_unlock(&ams_info.lock);
65
66	return snprintf(buf, PAGE_SIZE, "%d %d %d\n", x, y, z);
67}
68
69static DEVICE_ATTR(current, S_IRUGO, ams_show_current, NULL);
70
71static void ams_handle_irq(void *data)
72{
73	enum ams_irq irq = *((enum ams_irq *)data);
74
75	spin_lock(&ams_info.irq_lock);
76
77	ams_info.worker_irqs |= irq;
78	schedule_work(&ams_info.worker);
79
80	spin_unlock(&ams_info.irq_lock);
81}
82
83static enum ams_irq ams_freefall_irq_data = AMS_IRQ_FREEFALL;
84static struct pmf_irq_client ams_freefall_client = {
85	.owner = THIS_MODULE,
86	.handler = ams_handle_irq,
87	.data = &ams_freefall_irq_data,
88};
89
90static enum ams_irq ams_shock_irq_data = AMS_IRQ_SHOCK;
91static struct pmf_irq_client ams_shock_client = {
92	.owner = THIS_MODULE,
93	.handler = ams_handle_irq,
94	.data = &ams_shock_irq_data,
95};
96
97/* Once hard disk parking is implemented in the kernel, this function can
98 * trigger it.
99 */
100static void ams_worker(struct work_struct *work)
101{
102	unsigned long flags;
103	u8 irqs_to_clear;
104
105	mutex_lock(&ams_info.lock);
106
107	spin_lock_irqsave(&ams_info.irq_lock, flags);
108	irqs_to_clear = ams_info.worker_irqs;
109
110	if (ams_info.worker_irqs & AMS_IRQ_FREEFALL) {
111		if (verbose)
112			printk(KERN_INFO "ams: freefall detected!\n");
113
114		ams_info.worker_irqs &= ~AMS_IRQ_FREEFALL;
115	}
116
117	if (ams_info.worker_irqs & AMS_IRQ_SHOCK) {
118		if (verbose)
119			printk(KERN_INFO "ams: shock detected!\n");
120
121		ams_info.worker_irqs &= ~AMS_IRQ_SHOCK;
122	}
123
124	spin_unlock_irqrestore(&ams_info.irq_lock, flags);
125
126	ams_info.clear_irq(irqs_to_clear);
127
128	mutex_unlock(&ams_info.lock);
129}
130
131/* Call with ams_info.lock held! */
132int ams_sensor_attach(void)
133{
134	int result;
135	const u32 *prop;
136
137	/* Get orientation */
138	prop = of_get_property(ams_info.of_node, "orientation", NULL);
139	if (!prop)
140		return -ENODEV;
141	ams_info.orient1 = *prop;
142	ams_info.orient2 = *(prop + 1);
143
144	/* Register freefall interrupt handler */
145	result = pmf_register_irq_client(ams_info.of_node,
146			"accel-int-1",
147			&ams_freefall_client);
148	if (result < 0)
149		return -ENODEV;
150
151	/* Reset saved irqs */
152	ams_info.worker_irqs = 0;
153
154	/* Register shock interrupt handler */
155	result = pmf_register_irq_client(ams_info.of_node,
156			"accel-int-2",
157			&ams_shock_client);
158	if (result < 0)
159		goto release_freefall;
160
161	/* Create device */
162	ams_info.of_dev = of_platform_device_create(ams_info.of_node, "ams", NULL);
163	if (!ams_info.of_dev) {
164		result = -ENODEV;
165		goto release_shock;
166	}
167
168	/* Create attributes */
169	result = device_create_file(&ams_info.of_dev->dev, &dev_attr_current);
170	if (result)
171		goto release_of;
172
173	ams_info.vflag = !!(ams_info.get_vendor() & 0x10);
174
175	/* Init input device */
176	result = ams_input_init();
177	if (result)
178		goto release_device_file;
179
180	return result;
181release_device_file:
182	device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
183release_of:
184	of_device_unregister(ams_info.of_dev);
185release_shock:
186	pmf_unregister_irq_client(&ams_shock_client);
187release_freefall:
188	pmf_unregister_irq_client(&ams_freefall_client);
189	return result;
190}
191
192int __init ams_init(void)
193{
194	struct device_node *np;
195
196	spin_lock_init(&ams_info.irq_lock);
197	mutex_init(&ams_info.lock);
198	INIT_WORK(&ams_info.worker, ams_worker);
199
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);
205#endif
206
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);
212#endif
213	return -ENODEV;
214}
215
216void ams_sensor_detach(void)
217{
218	/* Remove input device */
219	ams_input_exit();
220
221	/* Remove attributes */
222	device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
223
224	/* Flush interrupt worker
225	 *
226	 * We do this after ams_info.exit(), because an interrupt might
227	 * have arrived before disabling them.
228	 */
229	flush_work(&ams_info.worker);
230
231	/* Remove device */
232	of_device_unregister(ams_info.of_dev);
233
234	/* Remove handler */
235	pmf_unregister_irq_client(&ams_shock_client);
236	pmf_unregister_irq_client(&ams_freefall_client);
237}
238
239static void __exit ams_exit(void)
240{
241	/* Shut down implementation */
242	ams_info.exit();
243}
244
245MODULE_AUTHOR("Stelian Pop, Michael Hanselmann");
246MODULE_DESCRIPTION("Apple Motion Sensor driver");
247MODULE_LICENSE("GPL");
248
249module_init(ams_init);
250module_exit(ams_exit);
251