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@xxxxxxx>
---
drivers/input/keyboard/Kconfig | 12 ++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/clps711x-keypad.c | 209 +++++++++++++++++++++++++++++++
3 files changed, 222 insertions(+)
create mode 100644 drivers/input/keyboard/clps711x-keypad.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index a673c9f..45274e3 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -151,6 +151,18 @@ config KEYBOARD_BFIN
To compile this driver as a module, choose M here: the
module will be called bf54x-keys.
+config KEYBOARD_CLPS711X
+ tristate "CLPS711X Keypad support"
+ depends on OF_GPIO && (ARCH_CLPS711X || COMPILE_TEST)
+ select INPUT_MATRIXKMAP
+ select INPUT_POLLDEV
+ help
+ Say Y here to enable the matrix keypad on the Cirrus Logic
+ CLPS711X CPUs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called clps711x-keypad.
+
config KEYBOARD_LKKBD
tristate "DECstation/VAXstation LK201/LK401 keyboard"
select SERIO
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index a699b61..f8589fe 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_KEYBOARD_AMIGA) += amikbd.o
obj-$(CONFIG_KEYBOARD_ATARI) += atakbd.o
obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o
obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
+obj-$(CONFIG_KEYBOARD_CLPS711X) += clps711x-keypad.o
obj-$(CONFIG_KEYBOARD_CROS_EC) += cros_ec_keyb.o
obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
diff --git a/drivers/input/keyboard/clps711x-keypad.c b/drivers/input/keyboard/clps711x-keypad.c
new file mode 100644
index 0000000..1e2c93f
--- /dev/null
+++ b/drivers/input/keyboard/clps711x-keypad.c
@@ -0,0 +1,209 @@
+/*
+ * Cirrus Logic CLPS711X Keypad driver
+ *
+ * Copyright (C) 2014 Alexander Shiyan <shc_work@xxxxxxx>
+ *
+ * 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/delay.h>
+#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/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 {
+ int gpio;
+ bool active_low;
+ 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;
+ 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;
+
+ /* Protection against fluctuations */
+ do {
+ state = gpio_get_value_cansleep(data->gpio);
+ udelay(1);
+ state1 = gpio_get_value_cansleep(data->gpio);
+ } while (state != state1);
+
+ state ^= data->active_low;
+
+ 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);
+ else
+ clear_bit(col, data->last_state);
+
+ input_event(dev->input, EV_MSC, MSC_SCAN, code);
+ if (keycodes[code])
+ input_report_key(dev->input,
+ keycodes[code], state);
+ }
+ }
+
+ /* Set all columns to low */
+ regmap_update_bits(priv->syscon, SYSCON_OFFSET,
+ SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
+ }
+
+ 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_phandle(np, "syscon");
+ 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];
+ enum of_gpio_flags flg;
+
+ data->gpio = of_get_named_gpio_flags(np, "row-gpios", i, &flg);
+ if (data->gpio < 0)
+ return data->gpio;
+
+ err = devm_gpio_request_one(dev, data->gpio, GPIOF_IN, NULL);
+ if (err)
+ return err;
+
+ data->active_low = flg & OF_GPIO_ACTIVE_LOW;
+ }
+
+ 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 = &pdev->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;
+
+ /* Report initial state */
+ clps711x_keypad_poll(poll_dev);
+
+ 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@xxxxxxx>");
+MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
+MODULE_LICENSE("GPL");
--
1.8.3.2
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