blob: 82ebca5a699c7954d9f0a02aa19b47fb73bc2f4c [file] [log] [blame]
Daniel Mackbb233fd2009-03-31 15:24:33 -07001/*
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
Daniel Mackdc791f82009-09-21 17:04:45 -070069 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 lis3_dev.pdata = spi->dev.platform_data;
Daniel Mackbb233fd2009-03-31 15:24:33 -070076 spi_set_drvdata(spi, &lis3_dev);
77
Daniel Mackdc791f82009-09-21 17:04:45 -070078 return lis3lv02d_init_device(&lis3_dev);
Daniel Mackbb233fd2009-03-31 15:24:33 -070079}
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
Daniel Mack2cd96452009-09-21 17:04:44 -070089#ifdef CONFIG_PM
90static int lis3lv02d_spi_suspend(struct spi_device *spi, pm_message_t mesg)
91{
92 struct lis3lv02d *lis3 = spi_get_drvdata(spi);
93
94 if (!lis3->pdata->wakeup_flags)
95 lis3lv02d_poweroff(&lis3_dev);
96
97 return 0;
98}
99
100static int lis3lv02d_spi_resume(struct spi_device *spi)
101{
102 struct lis3lv02d *lis3 = spi_get_drvdata(spi);
103
104 if (!lis3->pdata->wakeup_flags)
105 lis3lv02d_poweron(lis3);
106
107 return 0;
108}
109
110#else
111#define lis3lv02d_spi_suspend NULL
112#define lis3lv02d_spi_resume NULL
113#endif
114
Daniel Mackbb233fd2009-03-31 15:24:33 -0700115static struct spi_driver lis302dl_spi_driver = {
116 .driver = {
117 .name = DRV_NAME,
118 .owner = THIS_MODULE,
119 },
120 .probe = lis302dl_spi_probe,
121 .remove = __devexit_p(lis302dl_spi_remove),
Daniel Mack2cd96452009-09-21 17:04:44 -0700122 .suspend = lis3lv02d_spi_suspend,
123 .resume = lis3lv02d_spi_resume,
Daniel Mackbb233fd2009-03-31 15:24:33 -0700124};
125
126static int __init lis302dl_init(void)
127{
128 return spi_register_driver(&lis302dl_spi_driver);
129}
130
131static void __exit lis302dl_exit(void)
132{
133 spi_unregister_driver(&lis302dl_spi_driver);
134}
135
136module_init(lis302dl_init);
137module_exit(lis302dl_exit);
138
139MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
140MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
141MODULE_LICENSE("GPL");
142