cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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lis3lv02d_spi.c (3375B)

      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);