drivers/input/keyboard/sh_keysc.c - arm/linux-arm64-legacy - Git at Google

 /*
  * SuperH KEYSC Keypad Driver
  *
  * Copyright (C) 2008 Magnus Damm
  *
  * Based on gpio_keys.c, Copyright 2005 Phil Blundell
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.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 (!pdev->dev.platform_data) {
 		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) {
 		dev_err(&pdev->dev, "failed to get irq\n");
 		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, pdev->dev.platform_data, sizeof(priv->pdata));
 	pdata = &priv->pdata;

 	priv->iomem_base = ioremap_nocache(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:
 	platform_set_drvdata(pdev, NULL);
 	kfree(priv);
  err0:
 	return error;
 }

 static int __devexit 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);

 	platform_set_drvdata(pdev, NULL);
 	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");
	/*
	* SuperH KEYSC Keypad Driver
	*
	* Copyright (C) 2008 Magnus Damm
	*
	* Based on gpio_keys.c, Copyright 2005 Phil Blundell
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.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 (!pdev->dev.platform_data) {
	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) {
	dev_err(&pdev->dev, "failed to get irq\n");
	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, pdev->dev.platform_data, sizeof(priv->pdata));
	pdata = &priv->pdata;

	priv->iomem_base = ioremap_nocache(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:
	platform_set_drvdata(pdev, NULL);
	kfree(priv);
	err0:
	return error;
	}

	static int __devexit 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);

	platform_set_drvdata(pdev, NULL);
	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");