Input: add new driver for ARM CLPS711X keypad
This patch adds a new driver for keypad for Cirrus Logic CLPS711X CPUs. Target CPU contain keyboard interface which can scan 8 column lines, so we can read row GPIOs to read status and determine asserted state. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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27
Documentation/devicetree/bindings/input/clps711x-keypad.txt
Normal file
27
Documentation/devicetree/bindings/input/clps711x-keypad.txt
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@ -0,0 +1,27 @@
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* Cirrus Logic CLPS711X matrix keypad device tree bindings
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Required Properties:
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- compatible: Shall contain "cirrus,clps711x-keypad".
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- row-gpios: List of GPIOs used as row lines.
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- poll-interval: Poll interval time in milliseconds.
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- linux,keymap: The definition can be found at
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bindings/input/matrix-keymap.txt.
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Optional Properties:
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- autorepeat: Enable autorepeat feature.
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Example:
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keypad {
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compatible = "cirrus,ep7312-keypad", "cirrus,clps711x-keypad";
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autorepeat;
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poll-interval = <120>;
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row-gpios = <&porta 0 0>,
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<&porta 1 0>;
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linux,keymap = <
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MATRIX_KEY(0, 0, KEY_UP)
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MATRIX_KEY(0, 1, KEY_DOWN)
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MATRIX_KEY(1, 0, KEY_LEFT)
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MATRIX_KEY(1, 1, KEY_RIGHT)
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>;
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};
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@ -151,6 +151,18 @@ config KEYBOARD_BFIN
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To compile this driver as a module, choose M here: the
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To compile this driver as a module, choose M here: the
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module will be called bf54x-keys.
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module will be called bf54x-keys.
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config KEYBOARD_CLPS711X
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tristate "CLPS711X Keypad support"
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depends on OF_GPIO && (ARCH_CLPS711X || COMPILE_TEST)
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select INPUT_MATRIXKMAP
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select INPUT_POLLDEV
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help
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Say Y here to enable the matrix keypad on the Cirrus Logic
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CLPS711X CPUs.
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To compile this driver as a module, choose M here: the
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module will be called clps711x-keypad.
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config KEYBOARD_LKKBD
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config KEYBOARD_LKKBD
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tristate "DECstation/VAXstation LK201/LK401 keyboard"
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tristate "DECstation/VAXstation LK201/LK401 keyboard"
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select SERIO
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select SERIO
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@ -11,6 +11,7 @@ obj-$(CONFIG_KEYBOARD_AMIGA) += amikbd.o
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obj-$(CONFIG_KEYBOARD_ATARI) += atakbd.o
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obj-$(CONFIG_KEYBOARD_ATARI) += atakbd.o
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obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o
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obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o
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obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
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obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
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obj-$(CONFIG_KEYBOARD_CLPS711X) += clps711x-keypad.o
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obj-$(CONFIG_KEYBOARD_CROS_EC) += cros_ec_keyb.o
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obj-$(CONFIG_KEYBOARD_CROS_EC) += cros_ec_keyb.o
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obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
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obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
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obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
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obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
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207
drivers/input/keyboard/clps711x-keypad.c
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207
drivers/input/keyboard/clps711x-keypad.c
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@ -0,0 +1,207 @@
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/input.h>
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#include <linux/input-polldev.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_polled_dev *dev)
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{
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const unsigned short *keycodes = dev->input->keycode;
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struct clps711x_keypad_data *priv = dev->private;
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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(dev->input, EV_MSC,
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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(dev->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(dev->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_polled_dev *poll_dev;
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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 =
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syscon_regmap_lookup_by_compatible("cirrus,clps711x-syscon1");
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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_kzalloc(dev,
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sizeof(*priv->gpio_data) * priv->row_count,
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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);
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if (!data->desc)
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return -EINVAL;
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if (IS_ERR(data->desc))
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return PTR_ERR(data->desc);
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gpiod_direction_input(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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poll_dev = input_allocate_polled_device();
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if (!poll_dev)
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return -ENOMEM;
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poll_dev->private = priv;
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poll_dev->poll = clps711x_keypad_poll;
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poll_dev->poll_interval = poll_interval;
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poll_dev->input->name = pdev->name;
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poll_dev->input->dev.parent = dev;
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poll_dev->input->id.bustype = BUS_HOST;
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poll_dev->input->id.vendor = 0x0001;
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poll_dev->input->id.product = 0x0001;
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poll_dev->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, poll_dev->input);
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if (err)
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goto out_err;
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input_set_capability(poll_dev->input, EV_MSC, MSC_SCAN);
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if (of_property_read_bool(np, "autorepeat"))
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__set_bit(EV_REP, poll_dev->input->evbit);
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platform_set_drvdata(pdev, poll_dev);
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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_register_polled_device(poll_dev);
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if (err)
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goto out_err;
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return 0;
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out_err:
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input_free_polled_device(poll_dev);
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return err;
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}
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static int clps711x_keypad_remove(struct platform_device *pdev)
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{
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struct input_polled_dev *poll_dev = platform_get_drvdata(pdev);
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input_unregister_polled_device(poll_dev);
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input_free_polled_device(poll_dev);
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return 0;
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}
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static struct of_device_id clps711x_keypad_of_match[] = {
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{ .compatible = "cirrus,clps711x-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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.owner = THIS_MODULE,
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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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.remove = clps711x_keypad_remove,
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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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