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#include <linux/pm.h>
20
21#include "lis3lv02d.h"
22
23#define DRV_NAME 	"lis3lv02d_spi"
24#define LIS3_SPI_READ	0x80
25
26static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
27{
28	struct spi_device *spi = lis3->bus_priv;
29	int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
30	if (ret < 0)
31		return -EINVAL;
32
33	*v = (u8) ret;
34	return 0;
35}
36
37static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
38{
39	u8 tmp[2] = { reg, val };
40	struct spi_device *spi = lis3->bus_priv;
41	return spi_write(spi, tmp, sizeof(tmp));
42}
43
44static int lis3_spi_init(struct lis3lv02d *lis3)
45{
46	u8 reg;
47	int ret;
48
49	/* power up the device */
50	ret = lis3->read(lis3, CTRL_REG1, &reg);
51	if (ret < 0)
52		return ret;
53
54	reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
55	return lis3->write(lis3, CTRL_REG1, reg);
56}
57
58static union axis_conversion lis3lv02d_axis_normal =
59	{ .as_array = { 1, 2, 3 } };
60
61static int __devinit lis302dl_spi_probe(struct spi_device *spi)
62{
63	int ret;
64
65	spi->bits_per_word = 8;
66	spi->mode = SPI_MODE_0;
67	ret = spi_setup(spi);
68	if (ret < 0)
69		return ret;
70
71	lis3_dev.bus_priv	= spi;
72	lis3_dev.init		= lis3_spi_init;
73	lis3_dev.read		= lis3_spi_read;
74	lis3_dev.write		= lis3_spi_write;
75	lis3_dev.irq		= spi->irq;
76	lis3_dev.ac		= lis3lv02d_axis_normal;
77	lis3_dev.pdata		= spi->dev.platform_data;
78	spi_set_drvdata(spi, &lis3_dev);
79
80	return lis3lv02d_init_device(&lis3_dev);
81}
82
83static int __devexit lis302dl_spi_remove(struct spi_device *spi)
84{
85	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
86	lis3lv02d_joystick_disable(lis3);
87	lis3lv02d_poweroff(lis3);
88
89	return lis3lv02d_remove_fs(&lis3_dev);
90}
91
92#ifdef CONFIG_PM_SLEEP
93static int lis3lv02d_spi_suspend(struct device *dev)
94{
95	struct spi_device *spi = to_spi_device(dev);
96	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
97
98	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
99		lis3lv02d_poweroff(&lis3_dev);
100
101	return 0;
102}
103
104static int lis3lv02d_spi_resume(struct device *dev)
105{
106	struct spi_device *spi = to_spi_device(dev);
107	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
108
109	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
110		lis3lv02d_poweron(lis3);
111
112	return 0;
113}
114#endif
115
116static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
117			 lis3lv02d_spi_resume);
118
119static struct spi_driver lis302dl_spi_driver = {
120	.driver	 = {
121		.name   = DRV_NAME,
122		.owner  = THIS_MODULE,
123		.pm	= &lis3lv02d_spi_pm,
124	},
125	.probe	= lis302dl_spi_probe,
126	.remove	= __devexit_p(lis302dl_spi_remove),
127};
128
129module_spi_driver(lis302dl_spi_driver);
130
131MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
132MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
133MODULE_LICENSE("GPL");
134MODULE_ALIAS("spi:" DRV_NAME);
135