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/err.h>
14#include <linux/input.h>
15#include <linux/interrupt.h>
16#include <linux/workqueue.h>
17#include <linux/spi/spi.h>
18#include <linux/pm.h>
19#include <linux/of.h>
20#include <linux/of_platform.h>
21#include <linux/of_device.h>
22
23#include "lis3lv02d.h"
24
25#define DRV_NAME 	"lis3lv02d_spi"
26#define LIS3_SPI_READ	0x80
27
28static int lis3_spi_read(struct lis3lv02d *lis3, int reg, u8 *v)
29{
30	struct spi_device *spi = lis3->bus_priv;
31	int ret = spi_w8r8(spi, reg | LIS3_SPI_READ);
32	if (ret < 0)
33		return -EINVAL;
34
35	*v = (u8) ret;
36	return 0;
37}
38
39static int lis3_spi_write(struct lis3lv02d *lis3, int reg, u8 val)
40{
41	u8 tmp[2] = { reg, val };
42	struct spi_device *spi = lis3->bus_priv;
43	return spi_write(spi, tmp, sizeof(tmp));
44}
45
46static int lis3_spi_init(struct lis3lv02d *lis3)
47{
48	u8 reg;
49	int ret;
50
51	/* power up the device */
52	ret = lis3->read(lis3, CTRL_REG1, &reg);
53	if (ret < 0)
54		return ret;
55
56	reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
57	return lis3->write(lis3, CTRL_REG1, reg);
58}
59
60static union axis_conversion lis3lv02d_axis_normal =
61	{ .as_array = { 1, 2, 3 } };
62
63#ifdef CONFIG_OF
64static const struct of_device_id lis302dl_spi_dt_ids[] = {
65	{ .compatible = "st,lis302dl-spi" },
66	{}
67};
68MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
69#endif
70
71static int lis302dl_spi_probe(struct spi_device *spi)
72{
73	int ret;
74
75	spi->bits_per_word = 8;
76	spi->mode = SPI_MODE_0;
77	ret = spi_setup(spi);
78	if (ret < 0)
79		return ret;
80
81	lis3_dev.bus_priv	= spi;
82	lis3_dev.init		= lis3_spi_init;
83	lis3_dev.read		= lis3_spi_read;
84	lis3_dev.write		= lis3_spi_write;
85	lis3_dev.irq		= spi->irq;
86	lis3_dev.ac		= lis3lv02d_axis_normal;
87	lis3_dev.pdata		= spi->dev.platform_data;
88
89#ifdef CONFIG_OF
90	if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
91		lis3_dev.of_node = spi->dev.of_node;
92		ret = lis3lv02d_init_dt(&lis3_dev);
93		if (ret)
94			return ret;
95	}
96#endif
97	spi_set_drvdata(spi, &lis3_dev);
98
99	return lis3lv02d_init_device(&lis3_dev);
100}
101
102static int lis302dl_spi_remove(struct spi_device *spi)
103{
104	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
105	lis3lv02d_joystick_disable(lis3);
106	lis3lv02d_poweroff(lis3);
107
108	return lis3lv02d_remove_fs(&lis3_dev);
109}
110
111#ifdef CONFIG_PM_SLEEP
112static int lis3lv02d_spi_suspend(struct device *dev)
113{
114	struct spi_device *spi = to_spi_device(dev);
115	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
116
117	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
118		lis3lv02d_poweroff(&lis3_dev);
119
120	return 0;
121}
122
123static int lis3lv02d_spi_resume(struct device *dev)
124{
125	struct spi_device *spi = to_spi_device(dev);
126	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
127
128	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
129		lis3lv02d_poweron(lis3);
130
131	return 0;
132}
133#endif
134
135static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
136			 lis3lv02d_spi_resume);
137
138static struct spi_driver lis302dl_spi_driver = {
139	.driver	 = {
140		.name   = DRV_NAME,
141		.owner  = THIS_MODULE,
142		.pm	= &lis3lv02d_spi_pm,
143		.of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
144	},
145	.probe	= lis302dl_spi_probe,
146	.remove	= lis302dl_spi_remove,
147};
148
149module_spi_driver(lis302dl_spi_driver);
150
151MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
152MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
153MODULE_LICENSE("GPL");
154MODULE_ALIAS("spi:" DRV_NAME);
155