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();
 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
129static int __init lis302dl_init(void)
130{
131	return spi_register_driver(&lis302dl_spi_driver);
132}
133
134static void __exit lis302dl_exit(void)
135{
136	spi_unregister_driver(&lis302dl_spi_driver);
137}
138
139module_init(lis302dl_init);
140module_exit(lis302dl_exit);
141
142MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
143MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
144MODULE_LICENSE("GPL");
145MODULE_ALIAS("spi:" DRV_NAME);

  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		.pm	= &lis3lv02d_spi_pm,
142		.of_match_table = of_match_ptr(lis302dl_spi_dt_ids),
143	},
144	.probe	= lis302dl_spi_probe,
145	.remove	= lis302dl_spi_remove,
146};
147
148module_spi_driver(lis302dl_spi_driver);
 
 
 
 
 
 
 
 
 
 
 
149
150MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
151MODULE_DESCRIPTION("lis3lv02d SPI glue layer");
152MODULE_LICENSE("GPL");
153MODULE_ALIAS("spi:" DRV_NAME);