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
|
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "kxsd9.h"
#define KXSD9_READ(a) (0x80 | (a))
#define KXSD9_WRITE(a) (a)
static int kxsd9_spi_readreg(struct kxsd9_transport *tr, u8 address)
{
struct spi_device *spi = tr->trdev;
return spi_w8r8(spi, KXSD9_READ(address));
}
static int kxsd9_spi_writereg(struct kxsd9_transport *tr, u8 address, u8 val)
{
struct spi_device *spi = tr->trdev;
tr->tx[0] = KXSD9_WRITE(address),
tr->tx[1] = val;
return spi_write(spi, tr->tx, 2);
}
static int kxsd9_spi_readval(struct kxsd9_transport *tr, u8 address)
{
struct spi_device *spi = tr->trdev;
struct spi_transfer xfers[] = {
{
.bits_per_word = 8,
.len = 1,
.delay_usecs = 200,
.tx_buf = tr->tx,
}, {
.bits_per_word = 8,
.len = 2,
.rx_buf = tr->rx,
},
};
int ret;
tr->tx[0] = KXSD9_READ(address);
ret = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers));
if (!ret)
ret = (((u16)(tr->rx[0])) << 8) | (tr->rx[1]);
return ret;
}
static int kxsd9_spi_probe(struct spi_device *spi)
{
struct kxsd9_transport *transport;
int ret;
transport = devm_kzalloc(&spi->dev, sizeof(*transport), GFP_KERNEL);
if (!transport)
return -ENOMEM;
transport->trdev = spi;
transport->readreg = kxsd9_spi_readreg;
transport->writereg = kxsd9_spi_writereg;
transport->readval = kxsd9_spi_readval;
spi->mode = SPI_MODE_0;
spi_setup(spi);
ret = kxsd9_common_probe(&spi->dev,
transport,
spi_get_device_id(spi)->name);
if (ret)
return ret;
return 0;
}
static int kxsd9_spi_remove(struct spi_device *spi)
{
return kxsd9_common_remove(&spi->dev);
}
static const struct spi_device_id kxsd9_spi_id[] = {
{"kxsd9", 0},
{ },
};
MODULE_DEVICE_TABLE(spi, kxsd9_spi_id);
static struct spi_driver kxsd9_spi_driver = {
.driver = {
.name = "kxsd9",
},
.probe = kxsd9_spi_probe,
.remove = kxsd9_spi_remove,
.id_table = kxsd9_spi_id,
};
module_spi_driver(kxsd9_spi_driver);
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
MODULE_DESCRIPTION("Kionix KXSD9 SPI driver");
MODULE_LICENSE("GPL v2");
|
