drivers/input/keyboard/sh_keysc.c - kernel/windcharger - 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/clk.h>
 #include <linux/io.h>
 #include <asm/sh_keysc.h>

 #define KYCR1_OFFS   0x00
 #define KYCR2_OFFS   0x04
 #define KYINDR_OFFS  0x08
 #define KYOUTDR_OFFS 0x0c

 #define KYCR2_IRQ_LEVEL    0x10
 #define KYCR2_IRQ_DISABLED 0x00

 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 },
 };

 struct sh_keysc_priv {
 	void __iomem *iomem_base;
 	struct clk *clk;
 	unsigned long last_keys;
 	struct input_dev *input;
 	struct sh_keysc_info pdata;
 };

 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;
 	unsigned long keys, keys1, keys0, mask;
 	unsigned char keyin_set, tmp;
 	int i, k;

 	dev_dbg(&pdev->dev, "isr!\n");

 	keys1 = ~0;
 	keys0 = 0;

 	do {
 		keys = 0;
 		keyin_set = 0;

 		iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);

 		for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) {
 			iowrite16(0xfff ^ (3 << (i * 2)),
 				  priv->iomem_base + KYOUTDR_OFFS);
 			udelay(pdata->delay);
 			tmp = ioread16(priv->iomem_base + KYINDR_OFFS);
 			keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i);
 			tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1;
 			keyin_set |= tmp;
 		}

 		iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
 		iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8),
 			  priv->iomem_base + KYCR2_OFFS);

 		keys ^= ~0;
 		keys &= (1 << (sh_keysc_mode[pdata->mode].keyin *
 			       sh_keysc_mode[pdata->mode].keyout)) - 1;
 		keys1 &= keys;
 		keys0 |= keys;

 		dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys);

 	} while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01);

 	dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n",
 		priv->last_keys, keys0, keys1);

 	for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
 		k = pdata->keycodes[i];
 		if (!k)
 			continue;

 		mask = 1 << i;

 		if (!((priv->last_keys ^ keys0) & mask))
 			continue;

 		if ((keys1 | keys0) & mask) {
 			input_event(priv->input, EV_KEY, k, 1);
 			priv->last_keys |= mask;
 		}

 		if (!(keys1 & mask)) {
 			input_event(priv->input, EV_KEY, k, 0);
 			priv->last_keys &= ~mask;
 		}

 	}
 	input_sync(priv->input);

 	return IRQ_HANDLED;
 }

 #define res_size(res) ((res)->end - (res)->start + 1)

 static int __devinit sh_keysc_probe(struct platform_device *pdev)
 {
 	struct sh_keysc_priv *priv;
 	struct sh_keysc_info *pdata;
 	struct resource *res;
 	struct input_dev *input;
 	char clk_name[8];
 	int i, k;
 	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, res_size(res));
 	if (priv->iomem_base == NULL) {
 		dev_err(&pdev->dev, "failed to remap I/O memory\n");
 		error = -ENXIO;
 		goto err1;
 	}

 	snprintf(clk_name, sizeof(clk_name), "keysc%d", pdev->id);
 	priv->clk = clk_get(&pdev->dev, clk_name);
 	if (IS_ERR(priv->clk)) {
 		dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 		error = PTR_ERR(priv->clk);
 		goto err2;
 	}

 	priv->input = input_allocate_device();
 	if (!priv->input) {
 		dev_err(&pdev->dev, "failed to allocate input device\n");
 		error = -ENOMEM;
 		goto err3;
 	}

 	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;

 	error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev);
 	if (error) {
 		dev_err(&pdev->dev, "failed to request IRQ\n");
 		goto err4;
 	}

 	for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
 		k = pdata->keycodes[i];
 		if (k)
 			input_set_capability(input, EV_KEY, k);
 	}

 	error = input_register_device(input);
 	if (error) {
 		dev_err(&pdev->dev, "failed to register input device\n");
 		goto err5;
 	}

 	clk_enable(priv->clk);

 	iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) |
 		  pdata->scan_timing, priv->iomem_base + KYCR1_OFFS);
 	iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
 	iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS);

 	device_init_wakeup(&pdev->dev, 1);
 	return 0;
  err5:
 	free_irq(irq, pdev);
  err4:
 	input_free_device(input);
  err3:
 	clk_put(priv->clk);
  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);

 	iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);

 	input_unregister_device(priv->input);
 	free_irq(platform_get_irq(pdev, 0), pdev);
 	iounmap(priv->iomem_base);

 	clk_disable(priv->clk);
 	clk_put(priv->clk);

 	platform_set_drvdata(pdev, NULL);
 	kfree(priv);
 	return 0;
 }

 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 = ioread16(priv->iomem_base + KYCR1_OFFS);

 	if (device_may_wakeup(dev)) {
 		value |= 0x80;
 		enable_irq_wake(irq);
 	}
 	else
 		value &= ~0x80;

 	iowrite16(value, priv->iomem_base + KYCR1_OFFS);
 	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);

 	return 0;
 }

 static struct dev_pm_ops sh_keysc_dev_pm_ops = {
 	.suspend = sh_keysc_suspend,
 	.resume = sh_keysc_resume,
 };

 struct platform_driver sh_keysc_device_driver = {
 	.probe		= sh_keysc_probe,
 	.remove		= __devexit_p(sh_keysc_remove),
 	.driver		= {
 		.name	= "sh_keysc",
 		.pm	= &sh_keysc_dev_pm_ops,
 	}
 };

 static int __init sh_keysc_init(void)
 {
 	return platform_driver_register(&sh_keysc_device_driver);
 }

 static void __exit sh_keysc_exit(void)
 {
 	platform_driver_unregister(&sh_keysc_device_driver);
 }

 module_init(sh_keysc_init);
 module_exit(sh_keysc_exit);

 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/clk.h>
	#include <linux/io.h>
	#include <asm/sh_keysc.h>

	#define KYCR1_OFFS 0x00
	#define KYCR2_OFFS 0x04
	#define KYINDR_OFFS 0x08
	#define KYOUTDR_OFFS 0x0c

	#define KYCR2_IRQ_LEVEL 0x10
	#define KYCR2_IRQ_DISABLED 0x00

	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 },
	};

	struct sh_keysc_priv {
	void __iomem *iomem_base;
	struct clk *clk;
	unsigned long last_keys;
	struct input_dev *input;
	struct sh_keysc_info pdata;
	};

	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;
	unsigned long keys, keys1, keys0, mask;
	unsigned char keyin_set, tmp;
	int i, k;

	dev_dbg(&pdev->dev, "isr!\n");

	keys1 = ~0;
	keys0 = 0;

	do {
	keys = 0;
	keyin_set = 0;

	iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);

	for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) {
	iowrite16(0xfff ^ (3 << (i * 2)),
	priv->iomem_base + KYOUTDR_OFFS);
	udelay(pdata->delay);
	tmp = ioread16(priv->iomem_base + KYINDR_OFFS);
	keys \|= tmp << (sh_keysc_mode[pdata->mode].keyin * i);
	tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1;
	keyin_set \|= tmp;
	}

	iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
	iowrite16(KYCR2_IRQ_LEVEL \| (keyin_set << 8),
	priv->iomem_base + KYCR2_OFFS);

	keys ^= ~0;
	keys &= (1 << (sh_keysc_mode[pdata->mode].keyin *
	sh_keysc_mode[pdata->mode].keyout)) - 1;
	keys1 &= keys;
	keys0 \|= keys;

	dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys);

	} while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01);

	dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n",
	priv->last_keys, keys0, keys1);

	for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
	k = pdata->keycodes[i];
	if (!k)
	continue;

	mask = 1 << i;

	if (!((priv->last_keys ^ keys0) & mask))
	continue;

	if ((keys1 \| keys0) & mask) {
	input_event(priv->input, EV_KEY, k, 1);
	priv->last_keys \|= mask;
	}

	if (!(keys1 & mask)) {
	input_event(priv->input, EV_KEY, k, 0);
	priv->last_keys &= ~mask;
	}

	}
	input_sync(priv->input);

	return IRQ_HANDLED;
	}

	#define res_size(res) ((res)->end - (res)->start + 1)

	static int __devinit sh_keysc_probe(struct platform_device *pdev)
	{
	struct sh_keysc_priv *priv;
	struct sh_keysc_info *pdata;
	struct resource *res;
	struct input_dev *input;
	char clk_name[8];
	int i, k;
	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, res_size(res));
	if (priv->iomem_base == NULL) {
	dev_err(&pdev->dev, "failed to remap I/O memory\n");
	error = -ENXIO;
	goto err1;
	}

	snprintf(clk_name, sizeof(clk_name), "keysc%d", pdev->id);
	priv->clk = clk_get(&pdev->dev, clk_name);
	if (IS_ERR(priv->clk)) {
	dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
	error = PTR_ERR(priv->clk);
	goto err2;
	}

	priv->input = input_allocate_device();
	if (!priv->input) {
	dev_err(&pdev->dev, "failed to allocate input device\n");
	error = -ENOMEM;
	goto err3;
	}

	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;

	error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev);
	if (error) {
	dev_err(&pdev->dev, "failed to request IRQ\n");
	goto err4;
	}

	for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
	k = pdata->keycodes[i];
	if (k)
	input_set_capability(input, EV_KEY, k);
	}

	error = input_register_device(input);
	if (error) {
	dev_err(&pdev->dev, "failed to register input device\n");
	goto err5;
	}

	clk_enable(priv->clk);

	iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) \|
	pdata->scan_timing, priv->iomem_base + KYCR1_OFFS);
	iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
	iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS);

	device_init_wakeup(&pdev->dev, 1);
	return 0;
	err5:
	free_irq(irq, pdev);
	err4:
	input_free_device(input);
	err3:
	clk_put(priv->clk);
	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);

	iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);

	input_unregister_device(priv->input);
	free_irq(platform_get_irq(pdev, 0), pdev);
	iounmap(priv->iomem_base);

	clk_disable(priv->clk);
	clk_put(priv->clk);

	platform_set_drvdata(pdev, NULL);
	kfree(priv);
	return 0;
	}

	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 = ioread16(priv->iomem_base + KYCR1_OFFS);

	if (device_may_wakeup(dev)) {
	value \|= 0x80;
	enable_irq_wake(irq);
	}
	else
	value &= ~0x80;

	iowrite16(value, priv->iomem_base + KYCR1_OFFS);
	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);

	return 0;
	}

	static struct dev_pm_ops sh_keysc_dev_pm_ops = {
	.suspend = sh_keysc_suspend,
	.resume = sh_keysc_resume,
	};

	struct platform_driver sh_keysc_device_driver = {
	.probe = sh_keysc_probe,
	.remove = __devexit_p(sh_keysc_remove),
	.driver = {
	.name = "sh_keysc",
	.pm = &sh_keysc_dev_pm_ops,
	}
	};

	static int __init sh_keysc_init(void)
	{
	return platform_driver_register(&sh_keysc_device_driver);
	}

	static void __exit sh_keysc_exit(void)
	{
	platform_driver_unregister(&sh_keysc_device_driver);
	}

	module_init(sh_keysc_init);
	module_exit(sh_keysc_exit);

	MODULE_AUTHOR("Magnus Damm");
	MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
	MODULE_LICENSE("GPL");