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
|
/*
* lis3lv02d_spi - SPI glue layer for lis3lv02d
*
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* publishhed by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/spi/spi.h>
#include "lis3lv02d.h"
#define DRV_NAME "lis3lv02d_spi"
#define LIS3_SPI_READ 0x80
static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
{
struct spi_device *spi = lis3->bus_priv;
int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
if (ret < 0)
return -EINVAL;
*v = (u8) ret;
return 0;
}
static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
{
u8 tmp[2] = { reg, val };
struct spi_device *spi = lis3->bus_priv;
return spi_write(spi, tmp, sizeof(tmp));
}
static int lis3_spi_init(struct lis3lv02d *lis3)
{
u8 reg;
int ret;
/* power up the device */
ret = lis3->read(lis3, CTRL_REG1, ®);
if (ret < 0)
return ret;
reg |= CTRL1_PD0;
return lis3->write(lis3, CTRL_REG1, reg);
}
static struct axis_conversion lis3lv02d_axis_normal = { 1, 2, 3 };
static int __devinit lis302dl_spi_probe(struct spi_device *spi)
{
int ret;
spi->bits_per_word = 8;
spi->mode = SPI_MODE_0;
ret = spi_setup(spi);
if (ret < 0)
return ret;
lis3_dev.bus_priv = spi;
lis3_dev.init = lis3_spi_init;
lis3_dev.read = lis3_spi_read;
lis3_dev.write = lis3_spi_write;
lis3_dev.irq = spi->irq;
lis3_dev.ac = lis3lv02d_axis_normal;
lis3_dev.pdata = spi->dev.platform_data;
spi_set_drvdata(spi, &lis3_dev);
return lis3lv02d_init_device(&lis3_dev);
}
static int __devexit lis302dl_spi_remove(struct spi_device *spi)
{
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
lis3lv02d_joystick_disable();
lis3lv02d_poweroff(lis3);
return lis3lv02d_remove_fs(&lis3_dev);
}
#ifdef CONFIG_PM
static int lis3lv02d_spi_suspend(struct spi_device *spi, pm_message_t mesg)
{
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
if (!lis3->pdata->wakeup_flags)
lis3lv02d_poweroff(&lis3_dev);
return 0;
}
static int lis3lv02d_spi_resume(struct spi_device *spi)
{
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
if (!lis3->pdata->wakeup_flags)
lis3lv02d_poweron(lis3);
return 0;
}
#else
#define lis3lv02d_spi_suspend NULL
#define lis3lv02d_spi_resume NULL
#endif
static struct spi_driver lis302dl_spi_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = lis302dl_spi_probe,
.remove = __devexit_p(lis302dl_spi_remove),
.suspend = lis3lv02d_spi_suspend,
.resume = lis3lv02d_spi_resume,
};
static int __init lis302dl_init(void)
{
return spi_register_driver(&lis302dl_spi_driver);
}
static void __exit lis302dl_exit(void)
{
spi_unregister_driver(&lis302dl_spi_driver);
}
module_init(lis302dl_init);
module_exit(lis302dl_exit);
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:" DRV_NAME);
|
