drivers/input/keyboard/spear-keyboard.c - kernel/windcharger - Git at Google

 /*
  * SPEAr Keyboard Driver
  * Based on omap-keypad driver
  *
  * Copyright (C) 2010 ST Microelectronics
  * Rajeev Kumar<rajeev-dlh.kumar@st.com>
  *
  * This file is licensed under the terms of the GNU General Public
  * License version 2. This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  */

 #include <linux/clk.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/input.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_wakeup.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <plat/keyboard.h>

 /* Keyboard Registers */
 #define MODE_REG	0x00	/* 16 bit reg */
 #define STATUS_REG	0x0C	/* 2 bit reg */
 #define DATA_REG	0x10	/* 8 bit reg */
 #define INTR_MASK	0x54

 /* Register Values */
 /*
  * pclk freq mask = (APB FEQ -1)= 82 MHZ.Programme bit 15-9 in mode
  * control register as 1010010(82MHZ)
  */
 #define PCLK_FREQ_MSK	0xA400	/* 82 MHz */
 #define START_SCAN	0x0100
 #define SCAN_RATE_10	0x0000
 #define SCAN_RATE_20	0x0004
 #define SCAN_RATE_40	0x0008
 #define SCAN_RATE_80	0x000C
 #define MODE_KEYBOARD	0x0002
 #define DATA_AVAIL	0x2

 #define KEY_MASK	0xFF000000
 #define KEY_VALUE	0x00FFFFFF
 #define ROW_MASK	0xF0
 #define COLUMN_MASK	0x0F
 #define ROW_SHIFT	4

 struct spear_kbd {
 	struct input_dev *input;
 	struct resource *res;
 	void __iomem *io_base;
 	struct clk *clk;
 	unsigned int irq;
 	unsigned short last_key;
 	unsigned short keycodes[256];
 };

 static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
 {
 	struct spear_kbd *kbd = dev_id;
 	struct input_dev *input = kbd->input;
 	unsigned int key;
 	u8 sts, val;

 	sts = readb(kbd->io_base + STATUS_REG);
 	if (!(sts & DATA_AVAIL))
 		return IRQ_NONE;

 	if (kbd->last_key != KEY_RESERVED) {
 		input_report_key(input, kbd->last_key, 0);
 		kbd->last_key = KEY_RESERVED;
 	}

 	/* following reads active (row, col) pair */
 	val = readb(kbd->io_base + DATA_REG);
 	key = kbd->keycodes[val];

 	input_event(input, EV_MSC, MSC_SCAN, val);
 	input_report_key(input, key, 1);
 	input_sync(input);

 	kbd->last_key = key;

 	/* clear interrupt */
 	writeb(0, kbd->io_base + STATUS_REG);

 	return IRQ_HANDLED;
 }

 static int spear_kbd_open(struct input_dev *dev)
 {
 	struct spear_kbd *kbd = input_get_drvdata(dev);
 	int error;
 	u16 val;

 	kbd->last_key = KEY_RESERVED;

 	error = clk_enable(kbd->clk);
 	if (error)
 		return error;

 	/* program keyboard */
 	val = SCAN_RATE_80 | MODE_KEYBOARD | PCLK_FREQ_MSK;
 	writew(val, kbd->io_base + MODE_REG);
 	writeb(1, kbd->io_base + STATUS_REG);

 	/* start key scan */
 	val = readw(kbd->io_base + MODE_REG);
 	val |= START_SCAN;
 	writew(val, kbd->io_base + MODE_REG);

 	return 0;
 }

 static void spear_kbd_close(struct input_dev *dev)
 {
 	struct spear_kbd *kbd = input_get_drvdata(dev);
 	u16 val;

 	/* stop key scan */
 	val = readw(kbd->io_base + MODE_REG);
 	val &= ~START_SCAN;
 	writew(val, kbd->io_base + MODE_REG);

 	clk_disable(kbd->clk);

 	kbd->last_key = KEY_RESERVED;
 }

 static int __devinit spear_kbd_probe(struct platform_device *pdev)
 {
 	const struct kbd_platform_data *pdata = pdev->dev.platform_data;
 	const struct matrix_keymap_data *keymap;
 	struct spear_kbd *kbd;
 	struct input_dev *input_dev;
 	struct resource *res;
 	int irq;
 	int error;

 	if (!pdata) {
 		dev_err(&pdev->dev, "Invalid platform data\n");
 		return -EINVAL;
 	}

 	keymap = pdata->keymap;
 	if (!keymap) {
 		dev_err(&pdev->dev, "no keymap defined\n");
 		return -EINVAL;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "no keyboard resource defined\n");
 		return -EBUSY;
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "not able to get irq for the device\n");
 		return irq;
 	}

 	kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!kbd || !input_dev) {
 		dev_err(&pdev->dev, "out of memory\n");
 		error = -ENOMEM;
 		goto err_free_mem;
 	}

 	kbd->input = input_dev;
 	kbd->irq = irq;
 	kbd->res = request_mem_region(res->start, resource_size(res),
 				      pdev->name);
 	if (!kbd->res) {
 		dev_err(&pdev->dev, "keyboard region already claimed\n");
 		error = -EBUSY;
 		goto err_free_mem;
 	}

 	kbd->io_base = ioremap(res->start, resource_size(res));
 	if (!kbd->io_base) {
 		dev_err(&pdev->dev, "ioremap failed for kbd_region\n");
 		error = -ENOMEM;
 		goto err_release_mem_region;
 	}

 	kbd->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(kbd->clk)) {
 		error = PTR_ERR(kbd->clk);
 		goto err_iounmap;
 	}

 	input_dev->name = "Spear Keyboard";
 	input_dev->phys = "keyboard/input0";
 	input_dev->dev.parent = &pdev->dev;
 	input_dev->id.bustype = BUS_HOST;
 	input_dev->id.vendor = 0x0001;
 	input_dev->id.product = 0x0001;
 	input_dev->id.version = 0x0100;
 	input_dev->open = spear_kbd_open;
 	input_dev->close = spear_kbd_close;

 	__set_bit(EV_KEY, input_dev->evbit);
 	if (pdata->rep)
 		__set_bit(EV_REP, input_dev->evbit);
 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);

 	input_dev->keycode = kbd->keycodes;
 	input_dev->keycodesize = sizeof(kbd->keycodes[0]);
 	input_dev->keycodemax = ARRAY_SIZE(kbd->keycodes);

 	matrix_keypad_build_keymap(keymap, ROW_SHIFT,
 			input_dev->keycode, input_dev->keybit);

 	input_set_drvdata(input_dev, kbd);

 	error = request_irq(irq, spear_kbd_interrupt, 0, "keyboard", kbd);
 	if (error) {
 		dev_err(&pdev->dev, "request_irq fail\n");
 		goto err_put_clk;
 	}

 	error = input_register_device(input_dev);
 	if (error) {
 		dev_err(&pdev->dev, "Unable to register keyboard device\n");
 		goto err_free_irq;
 	}

 	device_init_wakeup(&pdev->dev, 1);
 	platform_set_drvdata(pdev, kbd);

 	return 0;

 err_free_irq:
 	free_irq(kbd->irq, kbd);
 err_put_clk:
 	clk_put(kbd->clk);
 err_iounmap:
 	iounmap(kbd->io_base);
 err_release_mem_region:
 	release_mem_region(res->start, resource_size(res));
 err_free_mem:
 	input_free_device(input_dev);
 	kfree(kbd);

 	return error;
 }

 static int __devexit spear_kbd_remove(struct platform_device *pdev)
 {
 	struct spear_kbd *kbd = platform_get_drvdata(pdev);

 	free_irq(kbd->irq, kbd);
 	input_unregister_device(kbd->input);
 	clk_put(kbd->clk);
 	iounmap(kbd->io_base);
 	release_mem_region(kbd->res->start, resource_size(kbd->res));
 	kfree(kbd);

 	device_init_wakeup(&pdev->dev, 1);
 	platform_set_drvdata(pdev, NULL);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int spear_kbd_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct spear_kbd *kbd = platform_get_drvdata(pdev);
 	struct input_dev *input_dev = kbd->input;

 	mutex_lock(&input_dev->mutex);

 	if (input_dev->users)
 		clk_enable(kbd->clk);

 	if (device_may_wakeup(&pdev->dev))
 		enable_irq_wake(kbd->irq);

 	mutex_unlock(&input_dev->mutex);

 	return 0;
 }

 static int spear_kbd_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct spear_kbd *kbd = platform_get_drvdata(pdev);
 	struct input_dev *input_dev = kbd->input;

 	mutex_lock(&input_dev->mutex);

 	if (device_may_wakeup(&pdev->dev))
 		disable_irq_wake(kbd->irq);

 	if (input_dev->users)
 		clk_enable(kbd->clk);

 	mutex_unlock(&input_dev->mutex);

 	return 0;
 }

 static const struct dev_pm_ops spear_kbd_pm_ops = {
 	.suspend	= spear_kbd_suspend,
 	.resume		= spear_kbd_resume,
 };
 #endif

 static struct platform_driver spear_kbd_driver = {
 	.probe		= spear_kbd_probe,
 	.remove		= __devexit_p(spear_kbd_remove),
 	.driver		= {
 		.name	= "keyboard",
 		.owner	= THIS_MODULE,
 #ifdef CONFIG_PM
 		.pm	= &spear_kbd_pm_ops,
 #endif
 	},
 };
 module_platform_driver(spear_kbd_driver);

 MODULE_AUTHOR("Rajeev Kumar");
 MODULE_DESCRIPTION("SPEAr Keyboard Driver");
 MODULE_LICENSE("GPL");
	/*
	* SPEAr Keyboard Driver
	* Based on omap-keypad driver
	*
	* Copyright (C) 2010 ST Microelectronics
	* Rajeev Kumar<rajeev-dlh.kumar@st.com>
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*/

	#include <linux/clk.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/input.h>
	#include <linux/io.h>
	#include <linux/irq.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/pm_wakeup.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <plat/keyboard.h>

	/* Keyboard Registers */
	#define MODE_REG 0x00 /* 16 bit reg */
	#define STATUS_REG 0x0C /* 2 bit reg */
	#define DATA_REG 0x10 /* 8 bit reg */
	#define INTR_MASK 0x54

	/* Register Values */
	/*
	* pclk freq mask = (APB FEQ -1)= 82 MHZ.Programme bit 15-9 in mode
	* control register as 1010010(82MHZ)
	*/
	#define PCLK_FREQ_MSK 0xA400 /* 82 MHz */
	#define START_SCAN 0x0100
	#define SCAN_RATE_10 0x0000
	#define SCAN_RATE_20 0x0004
	#define SCAN_RATE_40 0x0008
	#define SCAN_RATE_80 0x000C
	#define MODE_KEYBOARD 0x0002
	#define DATA_AVAIL 0x2

	#define KEY_MASK 0xFF000000
	#define KEY_VALUE 0x00FFFFFF
	#define ROW_MASK 0xF0
	#define COLUMN_MASK 0x0F
	#define ROW_SHIFT 4

	struct spear_kbd {
	struct input_dev *input;
	struct resource *res;
	void __iomem *io_base;
	struct clk *clk;
	unsigned int irq;
	unsigned short last_key;
	unsigned short keycodes[256];
	};

	static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id)
	{
	struct spear_kbd *kbd = dev_id;
	struct input_dev *input = kbd->input;
	unsigned int key;
	u8 sts, val;

	sts = readb(kbd->io_base + STATUS_REG);
	if (!(sts & DATA_AVAIL))
	return IRQ_NONE;

	if (kbd->last_key != KEY_RESERVED) {
	input_report_key(input, kbd->last_key, 0);
	kbd->last_key = KEY_RESERVED;
	}

	/* following reads active (row, col) pair */
	val = readb(kbd->io_base + DATA_REG);
	key = kbd->keycodes[val];

	input_event(input, EV_MSC, MSC_SCAN, val);
	input_report_key(input, key, 1);
	input_sync(input);

	kbd->last_key = key;

	/* clear interrupt */
	writeb(0, kbd->io_base + STATUS_REG);

	return IRQ_HANDLED;
	}

	static int spear_kbd_open(struct input_dev *dev)
	{
	struct spear_kbd *kbd = input_get_drvdata(dev);
	int error;
	u16 val;

	kbd->last_key = KEY_RESERVED;

	error = clk_enable(kbd->clk);
	if (error)
	return error;

	/* program keyboard */
	val = SCAN_RATE_80 \| MODE_KEYBOARD \| PCLK_FREQ_MSK;
	writew(val, kbd->io_base + MODE_REG);
	writeb(1, kbd->io_base + STATUS_REG);

	/* start key scan */
	val = readw(kbd->io_base + MODE_REG);
	val \|= START_SCAN;
	writew(val, kbd->io_base + MODE_REG);

	return 0;
	}

	static void spear_kbd_close(struct input_dev *dev)
	{
	struct spear_kbd *kbd = input_get_drvdata(dev);
	u16 val;

	/* stop key scan */
	val = readw(kbd->io_base + MODE_REG);
	val &= ~START_SCAN;
	writew(val, kbd->io_base + MODE_REG);

	clk_disable(kbd->clk);

	kbd->last_key = KEY_RESERVED;
	}

	static int __devinit spear_kbd_probe(struct platform_device *pdev)
	{
	const struct kbd_platform_data *pdata = pdev->dev.platform_data;
	const struct matrix_keymap_data *keymap;
	struct spear_kbd *kbd;
	struct input_dev *input_dev;
	struct resource *res;
	int irq;
	int error;

	if (!pdata) {
	dev_err(&pdev->dev, "Invalid platform data\n");
	return -EINVAL;
	}

	keymap = pdata->keymap;
	if (!keymap) {
	dev_err(&pdev->dev, "no keymap defined\n");
	return -EINVAL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(&pdev->dev, "no keyboard resource defined\n");
	return -EBUSY;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	dev_err(&pdev->dev, "not able to get irq for the device\n");
	return irq;
	}

	kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!kbd \|\| !input_dev) {
	dev_err(&pdev->dev, "out of memory\n");
	error = -ENOMEM;
	goto err_free_mem;
	}

	kbd->input = input_dev;
	kbd->irq = irq;
	kbd->res = request_mem_region(res->start, resource_size(res),
	pdev->name);
	if (!kbd->res) {
	dev_err(&pdev->dev, "keyboard region already claimed\n");
	error = -EBUSY;
	goto err_free_mem;
	}

	kbd->io_base = ioremap(res->start, resource_size(res));
	if (!kbd->io_base) {
	dev_err(&pdev->dev, "ioremap failed for kbd_region\n");
	error = -ENOMEM;
	goto err_release_mem_region;
	}

	kbd->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(kbd->clk)) {
	error = PTR_ERR(kbd->clk);
	goto err_iounmap;
	}

	input_dev->name = "Spear Keyboard";
	input_dev->phys = "keyboard/input0";
	input_dev->dev.parent = &pdev->dev;
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->open = spear_kbd_open;
	input_dev->close = spear_kbd_close;

	__set_bit(EV_KEY, input_dev->evbit);
	if (pdata->rep)
	__set_bit(EV_REP, input_dev->evbit);
	input_set_capability(input_dev, EV_MSC, MSC_SCAN);

	input_dev->keycode = kbd->keycodes;
	input_dev->keycodesize = sizeof(kbd->keycodes[0]);
	input_dev->keycodemax = ARRAY_SIZE(kbd->keycodes);

	matrix_keypad_build_keymap(keymap, ROW_SHIFT,
	input_dev->keycode, input_dev->keybit);

	input_set_drvdata(input_dev, kbd);

	error = request_irq(irq, spear_kbd_interrupt, 0, "keyboard", kbd);
	if (error) {
	dev_err(&pdev->dev, "request_irq fail\n");
	goto err_put_clk;
	}

	error = input_register_device(input_dev);
	if (error) {
	dev_err(&pdev->dev, "Unable to register keyboard device\n");
	goto err_free_irq;
	}

	device_init_wakeup(&pdev->dev, 1);
	platform_set_drvdata(pdev, kbd);

	return 0;

	err_free_irq:
	free_irq(kbd->irq, kbd);
	err_put_clk:
	clk_put(kbd->clk);
	err_iounmap:
	iounmap(kbd->io_base);
	err_release_mem_region:
	release_mem_region(res->start, resource_size(res));
	err_free_mem:
	input_free_device(input_dev);
	kfree(kbd);

	return error;
	}

	static int __devexit spear_kbd_remove(struct platform_device *pdev)
	{
	struct spear_kbd *kbd = platform_get_drvdata(pdev);

	free_irq(kbd->irq, kbd);
	input_unregister_device(kbd->input);
	clk_put(kbd->clk);
	iounmap(kbd->io_base);
	release_mem_region(kbd->res->start, resource_size(kbd->res));
	kfree(kbd);

	device_init_wakeup(&pdev->dev, 1);
	platform_set_drvdata(pdev, NULL);

	return 0;
	}

	#ifdef CONFIG_PM
	static int spear_kbd_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct spear_kbd *kbd = platform_get_drvdata(pdev);
	struct input_dev *input_dev = kbd->input;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users)
	clk_enable(kbd->clk);

	if (device_may_wakeup(&pdev->dev))
	enable_irq_wake(kbd->irq);

	mutex_unlock(&input_dev->mutex);

	return 0;
	}

	static int spear_kbd_resume(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct spear_kbd *kbd = platform_get_drvdata(pdev);
	struct input_dev *input_dev = kbd->input;

	mutex_lock(&input_dev->mutex);

	if (device_may_wakeup(&pdev->dev))
	disable_irq_wake(kbd->irq);

	if (input_dev->users)
	clk_enable(kbd->clk);

	mutex_unlock(&input_dev->mutex);

	return 0;
	}

	static const struct dev_pm_ops spear_kbd_pm_ops = {
	.suspend = spear_kbd_suspend,
	.resume = spear_kbd_resume,
	};
	#endif

	static struct platform_driver spear_kbd_driver = {
	.probe = spear_kbd_probe,
	.remove = __devexit_p(spear_kbd_remove),
	.driver = {
	.name = "keyboard",
	.owner = THIS_MODULE,
	#ifdef CONFIG_PM
	.pm = &spear_kbd_pm_ops,
	#endif
	},
	};
	module_platform_driver(spear_kbd_driver);

	MODULE_AUTHOR("Rajeev Kumar");
	MODULE_DESCRIPTION("SPEAr Keyboard Driver");
	MODULE_LICENSE("GPL");