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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* lis3lv02d_spi - SPI glue layer for lis3lv02d
*
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/spi/spi.h>
#include <linux/pm.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_device.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 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
return lis3->write(lis3, CTRL_REG1, reg);
}
static union axis_conversion lis3lv02d_axis_normal =
{ .as_array = { 1, 2, 3 } };
#ifdef CONFIG_OF
static const struct of_device_id lis302dl_spi_dt_ids[] = {
{ .compatible = "st,lis302dl-spi" },
{}
};
MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
#endif
static int 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;
#ifdef CONFIG_OF
if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
lis3_dev.of_node = spi->dev.of_node;
ret = lis3lv02d_init_dt(&lis3_dev);
if (ret)
return ret;
}
#endif
spi_set_drvdata(spi, &lis3_dev);
return lis3lv02d_init_device(&lis3_dev);
}
static void lis302dl_spi_remove(struct spi_device *spi)
{
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
lis3lv02d_joystick_disable(lis3);
lis3lv02d_poweroff(lis3);
lis3lv02d_remove_fs(&lis3_dev);
}
#ifdef CONFIG_PM_SLEEP
static int lis3lv02d_spi_suspend(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
if (!lis3->pdata || !lis3->pdata->wakeup_flags)
lis3lv02d_poweroff(&lis3_dev);
return 0;
}
static int lis3lv02d_spi_resume(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct lis3lv02d *lis3 = spi_get_drvdata(spi);
if (!lis3->pdata || !lis3->pdata->wakeup_flags)
lis3lv02d_poweron(lis3);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
lis3lv02d_spi_resume);
static struct spi_driver lis302dl_spi_driver = {
.driver = {
.name = DRV_NAME,
.pm = &lis3lv02d_spi_pm,
.of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
},
.probe = lis302dl_spi_probe,
.remove = lis302dl_spi_remove,
};
module_spi_driver(lis302dl_spi_driver);
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:" DRV_NAME);
|
