1 files changed, 336 insertions, 0 deletions
diff --git a/drivers/input/keyboard/sh_keysc.c b/drivers/input/keyboard/sh_keysc.c
new file mode 100644
index 000000000..c155adebf
--- /dev/null
+++ b/drivers/input/keyboard/sh_keysc.c
@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SuperH KEYSC Keypad Driver
+ *
+ * Copyright (C) 2008 Magnus Damm
+ *
+ * Based on gpio_keys.c, Copyright 2005 Phil Blundell
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/input/sh_keysc.h>
+#include <linux/bitmap.h>
+#include <linux/pm_runtime.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+static const struct {
+	unsigned char kymd, keyout, keyin;
+} sh_keysc_mode[] = {
+	[SH_KEYSC_MODE_1] = { 0, 6, 5 },
+	[SH_KEYSC_MODE_2] = { 1, 5, 6 },
+	[SH_KEYSC_MODE_3] = { 2, 4, 7 },
+	[SH_KEYSC_MODE_4] = { 3, 6, 6 },
+	[SH_KEYSC_MODE_5] = { 4, 6, 7 },
+	[SH_KEYSC_MODE_6] = { 5, 8, 8 },
+};
+
+struct sh_keysc_priv {
+	void __iomem *iomem_base;
+	DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS);
+	struct input_dev *input;
+	struct sh_keysc_info pdata;
+};
+
+#define KYCR1 0
+#define KYCR2 1
+#define KYINDR 2
+#define KYOUTDR 3
+
+#define KYCR2_IRQ_LEVEL    0x10
+#define KYCR2_IRQ_DISABLED 0x00
+
+static unsigned long sh_keysc_read(struct sh_keysc_priv *p, int reg_nr)
+{
+	return ioread16(p->iomem_base + (reg_nr << 2));
+}
+
+static void sh_keysc_write(struct sh_keysc_priv *p, int reg_nr,
+			   unsigned long value)
+{
+	iowrite16(value, p->iomem_base + (reg_nr << 2));
+}
+
+static void sh_keysc_level_mode(struct sh_keysc_priv *p,
+				unsigned long keys_set)
+{
+	struct sh_keysc_info *pdata = &p->pdata;
+
+	sh_keysc_write(p, KYOUTDR, 0);
+	sh_keysc_write(p, KYCR2, KYCR2_IRQ_LEVEL | (keys_set << 8));
+
+	if (pdata->kycr2_delay)
+		udelay(pdata->kycr2_delay);
+}
+
+static void sh_keysc_map_dbg(struct device *dev, unsigned long *map,
+			     const char *str)
+{
+	int k;
+
+	for (k = 0; k < BITS_TO_LONGS(SH_KEYSC_MAXKEYS); k++)
+		dev_dbg(dev, "%s[%d] 0x%lx\n", str, k, map[k]);
+}
+
+static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
+{
+	struct platform_device *pdev = dev_id;
+	struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
+	struct sh_keysc_info *pdata = &priv->pdata;
+	int keyout_nr = sh_keysc_mode[pdata->mode].keyout;
+	int keyin_nr = sh_keysc_mode[pdata->mode].keyin;
+	DECLARE_BITMAP(keys, SH_KEYSC_MAXKEYS);
+	DECLARE_BITMAP(keys0, SH_KEYSC_MAXKEYS);
+	DECLARE_BITMAP(keys1, SH_KEYSC_MAXKEYS);
+	unsigned char keyin_set, tmp;
+	int i, k, n;
+
+	dev_dbg(&pdev->dev, "isr!\n");
+
+	bitmap_fill(keys1, SH_KEYSC_MAXKEYS);
+	bitmap_zero(keys0, SH_KEYSC_MAXKEYS);
+
+	do {
+		bitmap_zero(keys, SH_KEYSC_MAXKEYS);
+		keyin_set = 0;
+
+		sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
+
+		for (i = 0; i < keyout_nr; i++) {
+			n = keyin_nr * i;
+
+			/* drive one KEYOUT pin low, read KEYIN pins */
+			sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2)));
+			udelay(pdata->delay);
+			tmp = sh_keysc_read(priv, KYINDR);
+
+			/* set bit if key press has been detected */
+			for (k = 0; k < keyin_nr; k++) {
+				if (tmp & (1 << k))
+					__set_bit(n + k, keys);
+			}
+
+			/* keep track of which KEYIN bits that have been set */
+			keyin_set |= tmp ^ ((1 << keyin_nr) - 1);
+		}
+
+		sh_keysc_level_mode(priv, keyin_set);
+
+		bitmap_complement(keys, keys, SH_KEYSC_MAXKEYS);
+		bitmap_and(keys1, keys1, keys, SH_KEYSC_MAXKEYS);
+		bitmap_or(keys0, keys0, keys, SH_KEYSC_MAXKEYS);
+
+		sh_keysc_map_dbg(&pdev->dev, keys, "keys");
+
+	} while (sh_keysc_read(priv, KYCR2) & 0x01);
+
+	sh_keysc_map_dbg(&pdev->dev, priv->last_keys, "last_keys");
+	sh_keysc_map_dbg(&pdev->dev, keys0, "keys0");
+	sh_keysc_map_dbg(&pdev->dev, keys1, "keys1");
+
+	for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
+		k = pdata->keycodes[i];
+		if (!k)
+			continue;
+
+		if (test_bit(i, keys0) == test_bit(i, priv->last_keys))
+			continue;
+
+		if (test_bit(i, keys1) || test_bit(i, keys0)) {
+			input_event(priv->input, EV_KEY, k, 1);
+			__set_bit(i, priv->last_keys);
+		}
+
+		if (!test_bit(i, keys1)) {
+			input_event(priv->input, EV_KEY, k, 0);
+			__clear_bit(i, priv->last_keys);
+		}
+
+	}
+	input_sync(priv->input);
+
+	return IRQ_HANDLED;
+}
+
+static int sh_keysc_probe(struct platform_device *pdev)
+{
+	struct sh_keysc_priv *priv;
+	struct sh_keysc_info *pdata;
+	struct resource *res;
+	struct input_dev *input;
+	int i;
+	int irq, error;
+
+	if (!dev_get_platdata(&pdev->dev)) {
+		dev_err(&pdev->dev, "no platform data defined\n");
+		error = -EINVAL;
+		goto err0;
+	}
+
+	error = -ENXIO;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "failed to get I/O memory\n");
+		goto err0;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		goto err0;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (priv == NULL) {
+		dev_err(&pdev->dev, "failed to allocate driver data\n");
+		error = -ENOMEM;
+		goto err0;
+	}
+
+	platform_set_drvdata(pdev, priv);
+	memcpy(&priv->pdata, dev_get_platdata(&pdev->dev), sizeof(priv->pdata));
+	pdata = &priv->pdata;
+
+	priv->iomem_base = ioremap(res->start, resource_size(res));
+	if (priv->iomem_base == NULL) {
+		dev_err(&pdev->dev, "failed to remap I/O memory\n");
+		error = -ENXIO;
+		goto err1;
+	}
+
+	priv->input = input_allocate_device();
+	if (!priv->input) {
+		dev_err(&pdev->dev, "failed to allocate input device\n");
+		error = -ENOMEM;
+		goto err2;
+	}
+
+	input = priv->input;
+	input->evbit[0] = BIT_MASK(EV_KEY);
+
+	input->name = pdev->name;
+	input->phys = "sh-keysc-keys/input0";
+	input->dev.parent = &pdev->dev;
+
+	input->id.bustype = BUS_HOST;
+	input->id.vendor = 0x0001;
+	input->id.product = 0x0001;
+	input->id.version = 0x0100;
+
+	input->keycode = pdata->keycodes;
+	input->keycodesize = sizeof(pdata->keycodes[0]);
+	input->keycodemax = ARRAY_SIZE(pdata->keycodes);
+
+	error = request_threaded_irq(irq, NULL, sh_keysc_isr, IRQF_ONESHOT,
+				     dev_name(&pdev->dev), pdev);
+	if (error) {
+		dev_err(&pdev->dev, "failed to request IRQ\n");
+		goto err3;
+	}
+
+	for (i = 0; i < SH_KEYSC_MAXKEYS; i++)
+		__set_bit(pdata->keycodes[i], input->keybit);
+	__clear_bit(KEY_RESERVED, input->keybit);
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		goto err4;
+	}
+
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+
+	sh_keysc_write(priv, KYCR1, (sh_keysc_mode[pdata->mode].kymd << 8) |
+		       pdata->scan_timing);
+	sh_keysc_level_mode(priv, 0);
+
+	device_init_wakeup(&pdev->dev, 1);
+
+	return 0;
+
+ err4:
+	free_irq(irq, pdev);
+ err3:
+	input_free_device(input);
+ err2:
+	iounmap(priv->iomem_base);
+ err1:
+	kfree(priv);
+ err0:
+	return error;
+}
+
+static int sh_keysc_remove(struct platform_device *pdev)
+{
+	struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
+
+	sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
+
+	input_unregister_device(priv->input);
+	free_irq(platform_get_irq(pdev, 0), pdev);
+	iounmap(priv->iomem_base);
+
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	kfree(priv);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int sh_keysc_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
+	int irq = platform_get_irq(pdev, 0);
+	unsigned short value;
+
+	value = sh_keysc_read(priv, KYCR1);
+
+	if (device_may_wakeup(dev)) {
+		sh_keysc_write(priv, KYCR1, value | 0x80);
+		enable_irq_wake(irq);
+	} else {
+		sh_keysc_write(priv, KYCR1, value & ~0x80);
+		pm_runtime_put_sync(dev);
+	}
+
+	return 0;
+}
+
+static int sh_keysc_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	int irq = platform_get_irq(pdev, 0);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(irq);
+	else
+		pm_runtime_get_sync(dev);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(sh_keysc_dev_pm_ops,
+			 sh_keysc_suspend, sh_keysc_resume);
+
+static struct platform_driver sh_keysc_device_driver = {
+	.probe		= sh_keysc_probe,
+	.remove		= sh_keysc_remove,
+	.driver		= {
+		.name	= "sh_keysc",
+		.pm	= &sh_keysc_dev_pm_ops,
+	}
+};
+module_platform_driver(sh_keysc_device_driver);
+
+MODULE_AUTHOR("Magnus Damm");
+MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
+MODULE_LICENSE("GPL");