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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tsc2005.c (2108B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * TSC2005 touchscreen driver
      4 *
      5 * Copyright (C) 2006-2010 Nokia Corporation
      6 * Copyright (C) 2015 QWERTY Embedded Design
      7 * Copyright (C) 2015 EMAC Inc.
      8 *
      9 * Based on original tsc2005.c by Lauri Leukkunen <lauri.leukkunen@nokia.com>
     10 */
     11
     12#include <linux/input.h>
     13#include <linux/module.h>
     14#include <linux/of.h>
     15#include <linux/spi/spi.h>
     16#include <linux/regmap.h>
     17#include "tsc200x-core.h"
     18
     19static const struct input_id tsc2005_input_id = {
     20	.bustype = BUS_SPI,
     21	.product = 2005,
     22};
     23
     24static int tsc2005_cmd(struct device *dev, u8 cmd)
     25{
     26	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
     27	struct spi_transfer xfer = {
     28		.tx_buf         = &tx,
     29		.len            = 1,
     30		.bits_per_word  = 8,
     31	};
     32	struct spi_message msg;
     33	struct spi_device *spi = to_spi_device(dev);
     34	int error;
     35
     36	spi_message_init(&msg);
     37	spi_message_add_tail(&xfer, &msg);
     38
     39	error = spi_sync(spi, &msg);
     40	if (error) {
     41		dev_err(dev, "%s: failed, command: %x, spi error: %d\n",
     42			__func__, cmd, error);
     43		return error;
     44	}
     45
     46	return 0;
     47}
     48
     49static int tsc2005_probe(struct spi_device *spi)
     50{
     51	int error;
     52
     53	spi->mode = SPI_MODE_0;
     54	spi->bits_per_word = 8;
     55	if (!spi->max_speed_hz)
     56		spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
     57
     58	error = spi_setup(spi);
     59	if (error)
     60		return error;
     61
     62	return tsc200x_probe(&spi->dev, spi->irq, &tsc2005_input_id,
     63			     devm_regmap_init_spi(spi, &tsc200x_regmap_config),
     64			     tsc2005_cmd);
     65}
     66
     67static void tsc2005_remove(struct spi_device *spi)
     68{
     69	tsc200x_remove(&spi->dev);
     70}
     71
     72#ifdef CONFIG_OF
     73static const struct of_device_id tsc2005_of_match[] = {
     74	{ .compatible = "ti,tsc2005" },
     75	{ /* sentinel */ }
     76};
     77MODULE_DEVICE_TABLE(of, tsc2005_of_match);
     78#endif
     79
     80static struct spi_driver tsc2005_driver = {
     81	.driver	= {
     82		.name	= "tsc2005",
     83		.of_match_table = of_match_ptr(tsc2005_of_match),
     84		.pm	= &tsc200x_pm_ops,
     85	},
     86	.probe	= tsc2005_probe,
     87	.remove	= tsc2005_remove,
     88};
     89module_spi_driver(tsc2005_driver);
     90
     91MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
     92MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
     93MODULE_LICENSE("GPL");
     94MODULE_ALIAS("spi:tsc2005");