lis3lv02d_spi.c

  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);