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![Alexander Shiyan](/assets/img/avatar_default.png)
Since version 5.13, the standard syscon bindings have been added to all clps711x DT nodes, so we can now use the more general syscon_regmap_lookup_by_phandle function to get the syscon pointer. Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com> Link: https://lore.kernel.org/r/20220420062725.25614-1-eagle.alexander923@gmail.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
184 lines
4.5 KiB
C
184 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cirrus Logic CLPS711X Keypad driver
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*
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* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
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*/
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/sched.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/mfd/syscon.h>
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#include <linux/mfd/syscon/clps711x.h>
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#define CLPS711X_KEYPAD_COL_COUNT 8
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struct clps711x_gpio_data {
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struct gpio_desc *desc;
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DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT);
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};
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struct clps711x_keypad_data {
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struct regmap *syscon;
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int row_count;
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unsigned int row_shift;
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struct clps711x_gpio_data *gpio_data;
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};
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static void clps711x_keypad_poll(struct input_dev *input)
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{
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const unsigned short *keycodes = input->keycode;
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struct clps711x_keypad_data *priv = input_get_drvdata(input);
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bool sync = false;
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int col, row;
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for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) {
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/* Assert column */
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regmap_update_bits(priv->syscon, SYSCON_OFFSET,
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SYSCON1_KBDSCAN_MASK,
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SYSCON1_KBDSCAN(8 + col));
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/* Scan rows */
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for (row = 0; row < priv->row_count; row++) {
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struct clps711x_gpio_data *data = &priv->gpio_data[row];
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bool state, state1;
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/* Read twice for protection against fluctuations */
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do {
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state = gpiod_get_value_cansleep(data->desc);
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cond_resched();
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state1 = gpiod_get_value_cansleep(data->desc);
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} while (state != state1);
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if (test_bit(col, data->last_state) != state) {
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int code = MATRIX_SCAN_CODE(row, col,
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priv->row_shift);
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if (state) {
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set_bit(col, data->last_state);
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input_event(input,
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EV_MSC, MSC_SCAN, code);
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} else {
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clear_bit(col, data->last_state);
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}
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if (keycodes[code])
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input_report_key(input,
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keycodes[code], state);
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sync = true;
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}
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}
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/* Set all columns to low */
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regmap_update_bits(priv->syscon, SYSCON_OFFSET,
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SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
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}
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if (sync)
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input_sync(input);
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}
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static int clps711x_keypad_probe(struct platform_device *pdev)
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{
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struct clps711x_keypad_data *priv;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct input_dev *input;
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u32 poll_interval;
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int i, err;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
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if (IS_ERR(priv->syscon))
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return PTR_ERR(priv->syscon);
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priv->row_count = of_gpio_named_count(np, "row-gpios");
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if (priv->row_count < 1)
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return -EINVAL;
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priv->gpio_data = devm_kcalloc(dev,
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priv->row_count, sizeof(*priv->gpio_data),
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GFP_KERNEL);
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if (!priv->gpio_data)
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return -ENOMEM;
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priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT);
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for (i = 0; i < priv->row_count; i++) {
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struct clps711x_gpio_data *data = &priv->gpio_data[i];
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data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN);
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if (IS_ERR(data->desc))
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return PTR_ERR(data->desc);
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}
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err = of_property_read_u32(np, "poll-interval", &poll_interval);
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if (err)
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return err;
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input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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input_set_drvdata(input, priv);
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input->name = pdev->name;
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input->dev.parent = dev;
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input->id.bustype = BUS_HOST;
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
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CLPS711X_KEYPAD_COL_COUNT,
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NULL, input);
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if (err)
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return err;
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input_set_capability(input, EV_MSC, MSC_SCAN);
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if (of_property_read_bool(np, "autorepeat"))
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__set_bit(EV_REP, input->evbit);
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/* Set all columns to low */
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regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
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SYSCON1_KBDSCAN(1));
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err = input_setup_polling(input, clps711x_keypad_poll);
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if (err)
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return err;
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input_set_poll_interval(input, poll_interval);
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err = input_register_device(input);
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if (err)
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return err;
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return 0;
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}
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static const struct of_device_id clps711x_keypad_of_match[] = {
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{ .compatible = "cirrus,ep7209-keypad", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);
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static struct platform_driver clps711x_keypad_driver = {
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.driver = {
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.name = "clps711x-keypad",
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.of_match_table = clps711x_keypad_of_match,
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},
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.probe = clps711x_keypad_probe,
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};
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module_platform_driver(clps711x_keypad_driver);
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MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
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MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
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MODULE_LICENSE("GPL");
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