--- /dev/null
+/*
+ * Cirrus Logic CLPS711X Keypad driver
+ *
+ * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/input.h>
+#include <linux/input-polldev.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/sched.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/clps711x.h>
+
+#define CLPS711X_KEYPAD_COL_COUNT 8
+
+struct clps711x_gpio_data {
+ struct gpio_desc *desc;
+ DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT);
+};
+
+struct clps711x_keypad_data {
+ struct regmap *syscon;
+ int row_count;
+ unsigned int row_shift;
+ struct clps711x_gpio_data *gpio_data;
+};
+
+static void clps711x_keypad_poll(struct input_polled_dev *dev)
+{
+ const unsigned short *keycodes = dev->input->keycode;
+ struct clps711x_keypad_data *priv = dev->private;
+ bool sync = false;
+ int col, row;
+
+ for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) {
+ /* Assert column */
+ regmap_update_bits(priv->syscon, SYSCON_OFFSET,
+ SYSCON1_KBDSCAN_MASK,
+ SYSCON1_KBDSCAN(8 + col));
+
+ /* Scan rows */
+ for (row = 0; row < priv->row_count; row++) {
+ struct clps711x_gpio_data *data = &priv->gpio_data[row];
+ bool state, state1;
+
+ /* Read twice for protection against fluctuations */
+ do {
+ state = gpiod_get_value_cansleep(data->desc);
+ cond_resched();
+ state1 = gpiod_get_value_cansleep(data->desc);
+ } while (state != state1);
+
+ if (test_bit(col, data->last_state) != state) {
+ int code = MATRIX_SCAN_CODE(row, col,
+ priv->row_shift);
+
+ if (state) {
+ set_bit(col, data->last_state);
+ input_event(dev->input, EV_MSC,
+ MSC_SCAN, code);
+ } else {
+ clear_bit(col, data->last_state);
+ }
+
+ if (keycodes[code])
+ input_report_key(dev->input,
+ keycodes[code], state);
+ sync = true;
+ }
+ }
+
+ /* Set all columns to low */
+ regmap_update_bits(priv->syscon, SYSCON_OFFSET,
+ SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
+ }
+
+ if (sync)
+ input_sync(dev->input);
+}
+
+static int clps711x_keypad_probe(struct platform_device *pdev)
+{
+ struct clps711x_keypad_data *priv;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct input_polled_dev *poll_dev;
+ u32 poll_interval;
+ int i, err;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->syscon =
+ syscon_regmap_lookup_by_compatible("cirrus,clps711x-syscon1");
+ if (IS_ERR(priv->syscon))
+ return PTR_ERR(priv->syscon);
+
+ priv->row_count = of_gpio_named_count(np, "row-gpios");
+ if (priv->row_count < 1)
+ return -EINVAL;
+
+ priv->gpio_data = devm_kzalloc(dev,
+ sizeof(*priv->gpio_data) * priv->row_count,
+ GFP_KERNEL);
+ if (!priv->gpio_data)
+ return -ENOMEM;
+
+ priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT);
+
+ for (i = 0; i < priv->row_count; i++) {
+ struct clps711x_gpio_data *data = &priv->gpio_data[i];
+
+ data->desc = devm_gpiod_get_index(dev, "row", i);
+ if (!data->desc)
+ return -EINVAL;
+
+ if (IS_ERR(data->desc))
+ return PTR_ERR(data->desc);
+
+ gpiod_direction_input(data->desc);
+ }
+
+ err = of_property_read_u32(np, "poll-interval", &poll_interval);
+ if (err)
+ return err;
+
+ poll_dev = input_allocate_polled_device();
+ if (!poll_dev)
+ return -ENOMEM;
+
+ poll_dev->private = priv;
+ poll_dev->poll = clps711x_keypad_poll;
+ poll_dev->poll_interval = poll_interval;
+ poll_dev->input->name = pdev->name;
+ poll_dev->input->dev.parent = dev;
+ poll_dev->input->id.bustype = BUS_HOST;
+ poll_dev->input->id.vendor = 0x0001;
+ poll_dev->input->id.product = 0x0001;
+ poll_dev->input->id.version = 0x0100;
+
+ err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
+ CLPS711X_KEYPAD_COL_COUNT,
+ NULL, poll_dev->input);
+ if (err)
+ goto out_err;
+
+ input_set_capability(poll_dev->input, EV_MSC, MSC_SCAN);
+ if (of_property_read_bool(np, "autorepeat"))
+ __set_bit(EV_REP, poll_dev->input->evbit);
+
+ platform_set_drvdata(pdev, poll_dev);
+
+ /* Set all columns to low */
+ regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
+ SYSCON1_KBDSCAN(1));
+
+ err = input_register_polled_device(poll_dev);
+ if (err)
+ goto out_err;
+
+ return 0;
+
+out_err:
+ input_free_polled_device(poll_dev);
+ return err;
+}
+
+static int clps711x_keypad_remove(struct platform_device *pdev)
+{
+ struct input_polled_dev *poll_dev = platform_get_drvdata(pdev);
+
+ input_unregister_polled_device(poll_dev);
+ input_free_polled_device(poll_dev);
+
+ return 0;
+}
+
+static struct of_device_id clps711x_keypad_of_match[] = {
+ { .compatible = "cirrus,clps711x-keypad", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);
+
+static struct platform_driver clps711x_keypad_driver = {
+ .driver = {
+ .name = "clps711x-keypad",
+ .owner = THIS_MODULE,
+ .of_match_table = clps711x_keypad_of_match,
+ },
+ .probe = clps711x_keypad_probe,
+ .remove = clps711x_keypad_remove,
+};
+module_platform_driver(clps711x_keypad_driver);
+
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
+MODULE_LICENSE("GPL");
projects / cascardo / linux.git / commitdiff