1 files changed, 379 insertions, 0 deletions

diff --git a/drivers/input/keyboard/ep93xx_keypad.c b/drivers/input/keyboard/ep93xx_keypad.c
new file mode 100644
index 000000000..f831f0150
--- /dev/null
+++ b/drivers/input/keyboard/ep93xx_keypad.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the Cirrus EP93xx matrix keypad controller.
+ *
+ * Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
+ *
+ * Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
+ *
+ * NOTE:
+ *
+ * The 3-key reset is triggered by pressing the 3 keys in
+ * Row 0, Columns 2, 4, and 7 at the same time.  This action can
+ * be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
+ *
+ * Normal operation for the matrix does not autorepeat the key press.
+ * This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
+ * flag.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/slab.h>
+#include <linux/soc/cirrus/ep93xx.h>
+#include <linux/platform_data/keypad-ep93xx.h>
+
+/*
+ * Keypad Interface Register offsets
+ */
+#define KEY_INIT		0x00	/* Key Scan Initialization register */
+#define KEY_DIAG		0x04	/* Key Scan Diagnostic register */
+#define KEY_REG			0x08	/* Key Value Capture register */
+
+/* Key Scan Initialization Register bit defines */
+#define KEY_INIT_DBNC_MASK	(0x00ff0000)
+#define KEY_INIT_DBNC_SHIFT	(16)
+#define KEY_INIT_DIS3KY		(1<<15)
+#define KEY_INIT_DIAG		(1<<14)
+#define KEY_INIT_BACK		(1<<13)
+#define KEY_INIT_T2		(1<<12)
+#define KEY_INIT_PRSCL_MASK	(0x000003ff)
+#define KEY_INIT_PRSCL_SHIFT	(0)
+
+/* Key Scan Diagnostic Register bit defines */
+#define KEY_DIAG_MASK		(0x0000003f)
+#define KEY_DIAG_SHIFT		(0)
+
+/* Key Value Capture Register bit defines */
+#define KEY_REG_K		(1<<15)
+#define KEY_REG_INT		(1<<14)
+#define KEY_REG_2KEYS		(1<<13)
+#define KEY_REG_1KEY		(1<<12)
+#define KEY_REG_KEY2_MASK	(0x00000fc0)
+#define KEY_REG_KEY2_SHIFT	(6)
+#define KEY_REG_KEY1_MASK	(0x0000003f)
+#define KEY_REG_KEY1_SHIFT	(0)
+
+#define EP93XX_MATRIX_SIZE	(EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)
+
+struct ep93xx_keypad {
+	struct ep93xx_keypad_platform_data *pdata;
+	struct input_dev *input_dev;
+	struct clk *clk;
+
+	void __iomem *mmio_base;
+
+	unsigned short keycodes[EP93XX_MATRIX_SIZE];
+
+	int key1;
+	int key2;
+
+	int irq;
+
+	bool enabled;
+};
+
+static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
+{
+	struct ep93xx_keypad *keypad = dev_id;
+	struct input_dev *input_dev = keypad->input_dev;
+	unsigned int status;
+	int keycode, key1, key2;
+
+	status = __raw_readl(keypad->mmio_base + KEY_REG);
+
+	keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
+	key1 = keypad->keycodes[keycode];
+
+	keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
+	key2 = keypad->keycodes[keycode];
+
+	if (status & KEY_REG_2KEYS) {
+		if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
+			input_report_key(input_dev, keypad->key1, 0);
+
+		if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
+			input_report_key(input_dev, keypad->key2, 0);
+
+		input_report_key(input_dev, key1, 1);
+		input_report_key(input_dev, key2, 1);
+
+		keypad->key1 = key1;
+		keypad->key2 = key2;
+
+	} else if (status & KEY_REG_1KEY) {
+		if (keypad->key1 && key1 != keypad->key1)
+			input_report_key(input_dev, keypad->key1, 0);
+
+		if (keypad->key2 && key1 != keypad->key2)
+			input_report_key(input_dev, keypad->key2, 0);
+
+		input_report_key(input_dev, key1, 1);
+
+		keypad->key1 = key1;
+		keypad->key2 = 0;
+
+	} else {
+		input_report_key(input_dev, keypad->key1, 0);
+		input_report_key(input_dev, keypad->key2, 0);
+
+		keypad->key1 = keypad->key2 = 0;
+	}
+	input_sync(input_dev);
+
+	return IRQ_HANDLED;
+}
+
+static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
+{
+	struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
+	unsigned int val = 0;
+
+	clk_set_rate(keypad->clk, pdata->clk_rate);
+
+	if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
+		val |= KEY_INIT_DIS3KY;
+	if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
+		val |= KEY_INIT_DIAG;
+	if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
+		val |= KEY_INIT_BACK;
+	if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
+		val |= KEY_INIT_T2;
+
+	val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
+
+	val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
+
+	__raw_writel(val, keypad->mmio_base + KEY_INIT);
+}
+
+static int ep93xx_keypad_open(struct input_dev *pdev)
+{
+	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
+
+	if (!keypad->enabled) {
+		ep93xx_keypad_config(keypad);
+		clk_enable(keypad->clk);
+		keypad->enabled = true;
+	}
+
+	return 0;
+}
+
+static void ep93xx_keypad_close(struct input_dev *pdev)
+{
+	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
+
+	if (keypad->enabled) {
+		clk_disable(keypad->clk);
+		keypad->enabled = false;
+	}
+}
+
+
+#ifdef CONFIG_PM_SLEEP
+static int ep93xx_keypad_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
+	struct input_dev *input_dev = keypad->input_dev;
+
+	mutex_lock(&input_dev->mutex);
+
+	if (keypad->enabled) {
+		clk_disable(keypad->clk);
+		keypad->enabled = false;
+	}
+
+	mutex_unlock(&input_dev->mutex);
+
+	if (device_may_wakeup(&pdev->dev))
+		enable_irq_wake(keypad->irq);
+
+	return 0;
+}
+
+static int ep93xx_keypad_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
+	struct input_dev *input_dev = keypad->input_dev;
+
+	if (device_may_wakeup(&pdev->dev))
+		disable_irq_wake(keypad->irq);
+
+	mutex_lock(&input_dev->mutex);
+
+	if (input_dev->users) {
+		if (!keypad->enabled) {
+			ep93xx_keypad_config(keypad);
+			clk_enable(keypad->clk);
+			keypad->enabled = true;
+		}
+	}
+
+	mutex_unlock(&input_dev->mutex);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
+			 ep93xx_keypad_suspend, ep93xx_keypad_resume);
+
+static int ep93xx_keypad_probe(struct platform_device *pdev)
+{
+	struct ep93xx_keypad *keypad;
+	const struct matrix_keymap_data *keymap_data;
+	struct input_dev *input_dev;
+	struct resource *res;
+	int err;
+
+	keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
+	if (!keypad)
+		return -ENOMEM;
+
+	keypad->pdata = dev_get_platdata(&pdev->dev);
+	if (!keypad->pdata) {
+		err = -EINVAL;
+		goto failed_free;
+	}
+
+	keymap_data = keypad->pdata->keymap_data;
+	if (!keymap_data) {
+		err = -EINVAL;
+		goto failed_free;
+	}
+
+	keypad->irq = platform_get_irq(pdev, 0);
+	if (keypad->irq < 0) {
+		err = keypad->irq;
+		goto failed_free;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		err = -ENXIO;
+		goto failed_free;
+	}
+
+	res = request_mem_region(res->start, resource_size(res), pdev->name);
+	if (!res) {
+		err = -EBUSY;
+		goto failed_free;
+	}
+
+	keypad->mmio_base = ioremap(res->start, resource_size(res));
+	if (keypad->mmio_base == NULL) {
+		err = -ENXIO;
+		goto failed_free_mem;
+	}
+
+	err = ep93xx_keypad_acquire_gpio(pdev);
+	if (err)
+		goto failed_free_io;
+
+	keypad->clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(keypad->clk)) {
+		err = PTR_ERR(keypad->clk);
+		goto failed_free_gpio;
+	}
+
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		err = -ENOMEM;
+		goto failed_put_clk;
+	}
+
+	keypad->input_dev = input_dev;
+
+	input_dev->name = pdev->name;
+	input_dev->id.bustype = BUS_HOST;
+	input_dev->open = ep93xx_keypad_open;
+	input_dev->close = ep93xx_keypad_close;
+	input_dev->dev.parent = &pdev->dev;
+
+	err = matrix_keypad_build_keymap(keymap_data, NULL,
+					 EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
+					 keypad->keycodes, input_dev);
+	if (err)
+		goto failed_free_dev;
+
+	if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
+		__set_bit(EV_REP, input_dev->evbit);
+	input_set_drvdata(input_dev, keypad);
+
+	err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
+			  0, pdev->name, keypad);
+	if (err)
+		goto failed_free_dev;
+
+	err = input_register_device(input_dev);
+	if (err)
+		goto failed_free_irq;
+
+	platform_set_drvdata(pdev, keypad);
+	device_init_wakeup(&pdev->dev, 1);
+
+	return 0;
+
+failed_free_irq:
+	free_irq(keypad->irq, keypad);
+failed_free_dev:
+	input_free_device(input_dev);
+failed_put_clk:
+	clk_put(keypad->clk);
+failed_free_gpio:
+	ep93xx_keypad_release_gpio(pdev);
+failed_free_io:
+	iounmap(keypad->mmio_base);
+failed_free_mem:
+	release_mem_region(res->start, resource_size(res));
+failed_free:
+	kfree(keypad);
+	return err;
+}
+
+static int ep93xx_keypad_remove(struct platform_device *pdev)
+{
+	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
+	struct resource *res;
+
+	free_irq(keypad->irq, keypad);
+
+	if (keypad->enabled)
+		clk_disable(keypad->clk);
+	clk_put(keypad->clk);
+
+	input_unregister_device(keypad->input_dev);
+
+	ep93xx_keypad_release_gpio(pdev);
+
+	iounmap(keypad->mmio_base);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(res->start, resource_size(res));
+
+	kfree(keypad);
+
+	return 0;
+}
+
+static struct platform_driver ep93xx_keypad_driver = {
+	.driver		= {
+		.name	= "ep93xx-keypad",
+		.pm	= &ep93xx_keypad_pm_ops,
+	},
+	.probe		= ep93xx_keypad_probe,
+	.remove		= ep93xx_keypad_remove,
+};
+module_platform_driver(ep93xx_keypad_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
+MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
+MODULE_ALIAS("platform:ep93xx-keypad");