cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

clps711x-keypad.c (4558B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Cirrus Logic CLPS711X Keypad driver
      4 *
      5 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
      6 */
      7
      8#include <linux/input.h>
      9#include <linux/module.h>
     10#include <linux/of_gpio.h>
     11#include <linux/platform_device.h>
     12#include <linux/regmap.h>
     13#include <linux/sched.h>
     14#include <linux/input/matrix_keypad.h>
     15#include <linux/mfd/syscon.h>
     16#include <linux/mfd/syscon/clps711x.h>
     17
     18#define CLPS711X_KEYPAD_COL_COUNT	8
     19
     20struct clps711x_gpio_data {
     21	struct gpio_desc *desc;
     22	DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT);
     23};
     24
     25struct clps711x_keypad_data {
     26	struct regmap			*syscon;
     27	int				row_count;
     28	unsigned int			row_shift;
     29	struct clps711x_gpio_data	*gpio_data;
     30};
     31
     32static void clps711x_keypad_poll(struct input_dev *input)
     33{
     34	const unsigned short *keycodes = input->keycode;
     35	struct clps711x_keypad_data *priv = input_get_drvdata(input);
     36	bool sync = false;
     37	int col, row;
     38
     39	for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) {
     40		/* Assert column */
     41		regmap_update_bits(priv->syscon, SYSCON_OFFSET,
     42				   SYSCON1_KBDSCAN_MASK,
     43				   SYSCON1_KBDSCAN(8 + col));
     44
     45		/* Scan rows */
     46		for (row = 0; row < priv->row_count; row++) {
     47			struct clps711x_gpio_data *data = &priv->gpio_data[row];
     48			bool state, state1;
     49
     50			/* Read twice for protection against fluctuations */
     51			do {
     52				state = gpiod_get_value_cansleep(data->desc);
     53				cond_resched();
     54				state1 = gpiod_get_value_cansleep(data->desc);
     55			} while (state != state1);
     56
     57			if (test_bit(col, data->last_state) != state) {
     58				int code = MATRIX_SCAN_CODE(row, col,
     59							    priv->row_shift);
     60
     61				if (state) {
     62					set_bit(col, data->last_state);
     63					input_event(input,
     64						    EV_MSC, MSC_SCAN, code);
     65				} else {
     66					clear_bit(col, data->last_state);
     67				}
     68
     69				if (keycodes[code])
     70					input_report_key(input,
     71							 keycodes[code], state);
     72				sync = true;
     73			}
     74		}
     75
     76		/* Set all columns to low */
     77		regmap_update_bits(priv->syscon, SYSCON_OFFSET,
     78				   SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
     79	}
     80
     81	if (sync)
     82		input_sync(input);
     83}
     84
     85static int clps711x_keypad_probe(struct platform_device *pdev)
     86{
     87	struct clps711x_keypad_data *priv;
     88	struct device *dev = &pdev->dev;
     89	struct device_node *np = dev->of_node;
     90	struct input_dev *input;
     91	u32 poll_interval;
     92	int i, err;
     93
     94	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
     95	if (!priv)
     96		return -ENOMEM;
     97
     98	priv->syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
     99	if (IS_ERR(priv->syscon))
    100		return PTR_ERR(priv->syscon);
    101
    102	priv->row_count = of_gpio_named_count(np, "row-gpios");
    103	if (priv->row_count < 1)
    104		return -EINVAL;
    105
    106	priv->gpio_data = devm_kcalloc(dev,
    107				priv->row_count, sizeof(*priv->gpio_data),
    108				GFP_KERNEL);
    109	if (!priv->gpio_data)
    110		return -ENOMEM;
    111
    112	priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT);
    113
    114	for (i = 0; i < priv->row_count; i++) {
    115		struct clps711x_gpio_data *data = &priv->gpio_data[i];
    116
    117		data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN);
    118		if (IS_ERR(data->desc))
    119			return PTR_ERR(data->desc);
    120	}
    121
    122	err = of_property_read_u32(np, "poll-interval", &poll_interval);
    123	if (err)
    124		return err;
    125
    126	input = devm_input_allocate_device(dev);
    127	if (!input)
    128		return -ENOMEM;
    129
    130	input_set_drvdata(input, priv);
    131
    132	input->name		= pdev->name;
    133	input->dev.parent	= dev;
    134	input->id.bustype	= BUS_HOST;
    135	input->id.vendor	= 0x0001;
    136	input->id.product	= 0x0001;
    137	input->id.version	= 0x0100;
    138
    139	err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
    140					 CLPS711X_KEYPAD_COL_COUNT,
    141					 NULL, input);
    142	if (err)
    143		return err;
    144
    145	input_set_capability(input, EV_MSC, MSC_SCAN);
    146	if (of_property_read_bool(np, "autorepeat"))
    147		__set_bit(EV_REP, input->evbit);
    148
    149	/* Set all columns to low */
    150	regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
    151			   SYSCON1_KBDSCAN(1));
    152
    153
    154	err = input_setup_polling(input, clps711x_keypad_poll);
    155	if (err)
    156		return err;
    157
    158	input_set_poll_interval(input, poll_interval);
    159
    160	err = input_register_device(input);
    161	if (err)
    162		return err;
    163
    164	return 0;
    165}
    166
    167static const struct of_device_id clps711x_keypad_of_match[] = {
    168	{ .compatible = "cirrus,ep7209-keypad", },
    169	{ }
    170};
    171MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);
    172
    173static struct platform_driver clps711x_keypad_driver = {
    174	.driver	= {
    175		.name		= "clps711x-keypad",
    176		.of_match_table	= clps711x_keypad_of_match,
    177	},
    178	.probe	= clps711x_keypad_probe,
    179};
    180module_platform_driver(clps711x_keypad_driver);
    181
    182MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
    183MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
    184MODULE_LICENSE("GPL");