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-rw-r--r--drivers/hwmon/lis3lv02d_spi.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/hwmon/lis3lv02d_spi.c b/drivers/hwmon/lis3lv02d_spi.c
new file mode 100644
index 000000000000..07ae74b0e191
--- /dev/null
+++ b/drivers/hwmon/lis3lv02d_spi.c
@@ -0,0 +1,114 @@
1/*
2 * lis3lv02d_spi - SPI glue layer for lis3lv02d
3 *
4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * publishhed by the Free Software Foundation.
9 */
10
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/err.h>
15#include <linux/input.h>
16#include <linux/interrupt.h>
17#include <linux/workqueue.h>
18#include <linux/spi/spi.h>
19
20#include "lis3lv02d.h"
21
22#define DRV_NAME "lis3lv02d_spi"
23#define LIS3_SPI_READ 0x80
24
25static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
26{
27 struct spi_device *spi = lis3->bus_priv;
28 int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
29 if (ret < 0)
30 return -EINVAL;
31
32 *v = (u8) ret;
33 return 0;
34}
35
36static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
37{
38 u8 tmp[2] = { reg, val };
39 struct spi_device *spi = lis3->bus_priv;
40 return spi_write(spi, tmp, sizeof(tmp));
41}
42
43static int lis3_spi_init(struct lis3lv02d *lis3)
44{
45 u8 reg;
46 int ret;
47
48 /* power up the device */
49 ret = lis3->read(lis3, CTRL_REG1, &reg);
50 if (ret < 0)
51 return ret;
52
53 reg |= CTRL1_PD0;
54 return lis3->write(lis3, CTRL_REG1, reg);
55}
56
57static struct axis_conversion lis3lv02d_axis_normal = { 1, 2, 3 };
58
59static int __devinit lis302dl_spi_probe(struct spi_device *spi)
60{
61 int ret;
62
63 spi->bits_per_word = 8;
64 spi->mode = SPI_MODE_0;
65 ret = spi_setup(spi);
66 if (ret < 0)
67 return ret;
68
69 lis3_dev.bus_priv = spi;
70 lis3_dev.init = lis3_spi_init;
71 lis3_dev.read = lis3_spi_read;
72 lis3_dev.write = lis3_spi_write;
73 lis3_dev.irq = spi->irq;
74 lis3_dev.ac = lis3lv02d_axis_normal;
75 spi_set_drvdata(spi, &lis3_dev);
76
77 ret = lis3lv02d_init_device(&lis3_dev);
78 return ret;
79}
80
81static int __devexit lis302dl_spi_remove(struct spi_device *spi)
82{
83 struct lis3lv02d *lis3 = spi_get_drvdata(spi);
84 lis3lv02d_joystick_disable();
85 lis3lv02d_poweroff(lis3);
86 return 0;
87}
88
89static struct spi_driver lis302dl_spi_driver = {
90 .driver = {
91 .name = DRV_NAME,
92 .owner = THIS_MODULE,
93 },
94 .probe = lis302dl_spi_probe,
95 .remove = __devexit_p(lis302dl_spi_remove),
96};
97
98static int __init lis302dl_init(void)
99{
100 return spi_register_driver(&lis302dl_spi_driver);
101}
102
103static void __exit lis302dl_exit(void)
104{
105 spi_unregister_driver(&lis302dl_spi_driver);
106}
107
108module_init(lis302dl_init);
109module_exit(lis302dl_exit);
110
111MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
112MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
113MODULE_LICENSE("GPL");
114