summaryrefslogtreecommitdiff
path: root/drivers/hwmon/ams/ams-core.c
blob: dbe6a32c064e840bd3236f36d47ce6bcfb802700 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
/*
 * 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 <asm/of_platform.h>

#include "ams.h"

/* There is only one motion sensor per machine */
struct ams ams_info;

static unsigned int verbose;
module_param(verbose, bool, 0644);
MODULE_PARM_DESC(verbose, "Show free falls and shocks in kernel output");

/* Call with ams_info.lock held! */
void ams_sensors(s8 *x, s8 *y, s8 *z)
{
	u32 orient = ams_info.vflag? ams_info.orient1 : ams_info.orient2;

	if (orient & 0x80)
		/* X and Y swapped */
		ams_info.get_xyz(y, x, z);
	else
		ams_info.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_info.lock);
	ams_sensors(&x, &y, &z);
	mutex_unlock(&ams_info.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);

	spin_lock(&ams_info.irq_lock);

	ams_info.worker_irqs |= irq;
	schedule_work(&ams_info.worker);

	spin_unlock(&ams_info.irq_lock);
}

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(struct work_struct *work)
{
	mutex_lock(&ams_info.lock);

	if (ams_info.has_device) {
		unsigned long flags;

		spin_lock_irqsave(&ams_info.irq_lock, flags);

		if (ams_info.worker_irqs & AMS_IRQ_FREEFALL) {
			if (verbose)
				printk(KERN_INFO "ams: freefall detected!\n");

			ams_info.worker_irqs &= ~AMS_IRQ_FREEFALL;

			/* we must call this with interrupts enabled */
			spin_unlock_irqrestore(&ams_info.irq_lock, flags);
			ams_info.clear_irq(AMS_IRQ_FREEFALL);
			spin_lock_irqsave(&ams_info.irq_lock, flags);
		}

		if (ams_info.worker_irqs & AMS_IRQ_SHOCK) {
			if (verbose)
				printk(KERN_INFO "ams: shock detected!\n");

			ams_info.worker_irqs &= ~AMS_IRQ_SHOCK;

			/* we must call this with interrupts enabled */
			spin_unlock_irqrestore(&ams_info.irq_lock, flags);
			ams_info.clear_irq(AMS_IRQ_SHOCK);
			spin_lock_irqsave(&ams_info.irq_lock, flags);
		}

		spin_unlock_irqrestore(&ams_info.irq_lock, flags);
	}

	mutex_unlock(&ams_info.lock);
}

/* Call with ams_info.lock held! */
int ams_sensor_attach(void)
{
	int result;
	const u32 *prop;

	/* Get orientation */
	prop = of_get_property(ams_info.of_node, "orientation", NULL);
	if (!prop)
		return -ENODEV;
	ams_info.orient1 = *prop;
	ams_info.orient2 = *(prop + 1);

	/* Register freefall interrupt handler */
	result = pmf_register_irq_client(ams_info.of_node,
			"accel-int-1",
			&ams_freefall_client);
	if (result < 0)
		return -ENODEV;

	/* Reset saved irqs */
	ams_info.worker_irqs = 0;

	/* Register shock interrupt handler */
	result = pmf_register_irq_client(ams_info.of_node,
			"accel-int-2",
			&ams_shock_client);
	if (result < 0)
		goto release_freefall;

	/* Create device */
	ams_info.of_dev = of_platform_device_create(ams_info.of_node, "ams", NULL);
	if (!ams_info.of_dev) {
		result = -ENODEV;
		goto release_shock;
	}

	/* Create attributes */
	result = device_create_file(&ams_info.of_dev->dev, &dev_attr_current);
	if (result)
		goto release_of;

	ams_info.vflag = !!(ams_info.get_vendor() & 0x10);

	/* Init input device */
	result = ams_input_init();
	if (result)
		goto release_device_file;

	return result;
release_device_file:
	device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);
release_of:
	of_device_unregister(ams_info.of_dev);
release_shock:
	pmf_unregister_irq_client(&ams_shock_client);
release_freefall:
	pmf_unregister_irq_client(&ams_freefall_client);
	return result;
}

int __init ams_init(void)
{
	struct device_node *np;

	spin_lock_init(&ams_info.irq_lock);
	mutex_init(&ams_info.lock);
	INIT_WORK(&ams_info.worker, ams_worker);

#ifdef CONFIG_SENSORS_AMS_I2C
	np = of_find_node_by_name(NULL, "accelerometer");
	if (np && of_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 && of_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_info.lock);

	if (ams_info.has_device) {
		/* Remove input device */
		ams_input_exit();

		/* Shut down implementation */
		ams_info.exit();

		/* Flush interrupt worker
		 *
		 * We do this after ams_info.exit(), because an interrupt might
		 * have arrived before disabling them.
		 */
		flush_scheduled_work();

		/* Remove attributes */
		device_remove_file(&ams_info.of_dev->dev, &dev_attr_current);

		/* Remove device */
		of_device_unregister(ams_info.of_dev);

		/* Remove handler */
		pmf_unregister_irq_client(&ams_shock_client);
		pmf_unregister_irq_client(&ams_freefall_client);
	}

	mutex_unlock(&ams_info.lock);
}

MODULE_AUTHOR("Stelian Pop, Michael Hanselmann");
MODULE_DESCRIPTION("Apple Motion Sensor driver");
MODULE_LICENSE("GPL");

module_init(ams_init);
module_exit(ams_exit);