1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * lis3lv02d_spi - SPI glue layer for lis3lv02d
4 *
5 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/err.h>
11#include <linux/input.h>
12#include <linux/interrupt.h>
13#include <linux/workqueue.h>
14#include <linux/spi/spi.h>
15#include <linux/pm.h>
16#include <linux/of.h>
17#include <linux/of_platform.h>
18#include <linux/of_device.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 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
54	return lis3->write(lis3, CTRL_REG1, reg);
55}
56
57static union axis_conversion lis3lv02d_axis_normal =
58	{ .as_array = { 1, 2, 3 } };
59
60#ifdef CONFIG_OF
61static const struct of_device_id lis302dl_spi_dt_ids[] = {
62	{ .compatible = "st,lis302dl-spi" },
63	{}
64};
65MODULE_DEVICE_TABLE(of, lis302dl_spi_dt_ids);
66#endif
67
68static int lis302dl_spi_probe(struct spi_device *spi)
69{
70	int ret;
71
72	spi->bits_per_word = 8;
73	spi->mode = SPI_MODE_0;
74	ret = spi_setup(spi);
75	if (ret < 0)
76		return ret;
77
78	lis3_dev.bus_priv	= spi;
79	lis3_dev.init		= lis3_spi_init;
80	lis3_dev.read		= lis3_spi_read;
81	lis3_dev.write		= lis3_spi_write;
82	lis3_dev.irq		= spi->irq;
83	lis3_dev.ac		= lis3lv02d_axis_normal;
84	lis3_dev.pdata		= spi->dev.platform_data;
85
86#ifdef CONFIG_OF
87	if (of_match_device(lis302dl_spi_dt_ids, &spi->dev)) {
88		lis3_dev.of_node = spi->dev.of_node;
89		ret = lis3lv02d_init_dt(&lis3_dev);
90		if (ret)
91			return ret;
92	}
93#endif
94	spi_set_drvdata(spi, &lis3_dev);
95
96	return lis3lv02d_init_device(&lis3_dev);
97}
98
99static void lis302dl_spi_remove(struct spi_device *spi)
100{
101	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
102	lis3lv02d_joystick_disable(lis3);
103	lis3lv02d_poweroff(lis3);
104
105	lis3lv02d_remove_fs(&lis3_dev);
106}
107
108#ifdef CONFIG_PM_SLEEP
109static int lis3lv02d_spi_suspend(struct device *dev)
110{
111	struct spi_device *spi = to_spi_device(dev);
112	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
113
114	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
115		lis3lv02d_poweroff(&lis3_dev);
116
117	return 0;
118}
119
120static int lis3lv02d_spi_resume(struct device *dev)
121{
122	struct spi_device *spi = to_spi_device(dev);
123	struct lis3lv02d *lis3 = spi_get_drvdata(spi);
124
125	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
126		lis3lv02d_poweron(lis3);
127
128	return 0;
129}
130#endif
131
132static SIMPLE_DEV_PM_OPS(lis3lv02d_spi_pm, lis3lv02d_spi_suspend,
133			 lis3lv02d_spi_resume);
134
135static struct spi_driver lis302dl_spi_driver = {
136	.driver	 = {
137		.name   = DRV_NAME,
138		.pm	= &lis3lv02d_spi_pm,
139		.of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
140	},
141	.probe	= lis302dl_spi_probe,
142	.remove	= lis302dl_spi_remove,
143};
144
145module_spi_driver(lis302dl_spi_driver);
146
147MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
148MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
149MODULE_LICENSE("GPL");
150MODULE_ALIAS("spi:" DRV_NAME);
151