drivers/input/keyboard/tnetv107x-keypad.c - maze/linux - Git at Google

 /*
  * Texas Instruments TNETV107X Keypad Driver
  *
  * Copyright (C) 2010 Texas Instruments
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/input.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/clk.h>
 #include <linux/input/matrix_keypad.h>

 #define BITS(x)			(BIT(x) - 1)

 #define KEYPAD_ROWS		9
 #define KEYPAD_COLS		9

 #define DEBOUNCE_MIN		0x400ul
 #define DEBOUNCE_MAX		0x3ffffffful

 struct keypad_regs {
 	u32	rev;
 	u32	mode;
 	u32	mask;
 	u32	pol;
 	u32	dclock;
 	u32	rclock;
 	u32	stable_cnt;
 	u32	in_en;
 	u32	out;
 	u32	out_en;
 	u32	in;
 	u32	lock;
 	u32	pres[3];
 };

 #define keypad_read(kp, reg)		__raw_readl(&(kp)->regs->reg)
 #define keypad_write(kp, reg, val)	__raw_writel(val, &(kp)->regs->reg)

 struct keypad_data {
 	struct input_dev		*input_dev;
 	struct resource			*res;
 	struct keypad_regs __iomem	*regs;
 	struct clk			*clk;
 	struct device			*dev;
 	spinlock_t			lock;
 	u32				irq_press;
 	u32				irq_release;
 	int				rows, cols, row_shift;
 	int				debounce_ms, active_low;
 	u32				prev_keys[3];
 	unsigned short			keycodes[];
 };

 static irqreturn_t keypad_irq(int irq, void *data)
 {
 	struct keypad_data *kp = data;
 	int i, bit, val, row, col, code;
 	unsigned long flags;
 	u32 curr_keys[3];
 	u32 change;

 	spin_lock_irqsave(&kp->lock, flags);

 	memset(curr_keys, 0, sizeof(curr_keys));
 	if (irq == kp->irq_press)
 		for (i = 0; i < 3; i++)
 			curr_keys[i] = keypad_read(kp, pres[i]);

 	for (i = 0; i < 3; i++) {
 		change = curr_keys[i] ^ kp->prev_keys[i];

 		while (change) {
 			bit     = fls(change) - 1;
 			change ^= BIT(bit);
 			val     = curr_keys[i] & BIT(bit);
 			bit    += i * 32;
 			row     = bit / KEYPAD_COLS;
 			col     = bit % KEYPAD_COLS;

 			code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
 			input_event(kp->input_dev, EV_MSC, MSC_SCAN, code);
 			input_report_key(kp->input_dev, kp->keycodes[code],
 					 val);
 		}
 	}
 	input_sync(kp->input_dev);
 	memcpy(kp->prev_keys, curr_keys, sizeof(curr_keys));

 	if (irq == kp->irq_press)
 		keypad_write(kp, lock, 0); /* Allow hardware updates */

 	spin_unlock_irqrestore(&kp->lock, flags);

 	return IRQ_HANDLED;
 }

 static int keypad_start(struct input_dev *dev)
 {
 	struct keypad_data *kp = input_get_drvdata(dev);
 	unsigned long mask, debounce, clk_rate_khz;
 	unsigned long flags;

 	clk_enable(kp->clk);
 	clk_rate_khz = clk_get_rate(kp->clk) / 1000;

 	spin_lock_irqsave(&kp->lock, flags);

 	/* Initialize device registers */
 	keypad_write(kp, mode, 0);

 	mask  = BITS(kp->rows) << KEYPAD_COLS;
 	mask |= BITS(kp->cols);
 	keypad_write(kp, mask, ~mask);

 	keypad_write(kp, pol, kp->active_low ? 0 : 0x3ffff);
 	keypad_write(kp, stable_cnt, 3);

 	debounce = kp->debounce_ms * clk_rate_khz;
 	debounce = clamp(debounce, DEBOUNCE_MIN, DEBOUNCE_MAX);
 	keypad_write(kp, dclock, debounce);
 	keypad_write(kp, rclock, 4 * debounce);

 	keypad_write(kp, in_en, 1);

 	spin_unlock_irqrestore(&kp->lock, flags);

 	return 0;
 }

 static void keypad_stop(struct input_dev *dev)
 {
 	struct keypad_data *kp = input_get_drvdata(dev);

 	synchronize_irq(kp->irq_press);
 	synchronize_irq(kp->irq_release);
 	clk_disable(kp->clk);
 }

 static int __devinit keypad_probe(struct platform_device *pdev)
 {
 	const struct matrix_keypad_platform_data *pdata;
 	const struct matrix_keymap_data *keymap_data;
 	struct device *dev = &pdev->dev;
 	struct keypad_data *kp;
 	int error = 0, sz, row_shift;
 	u32 rev = 0;

 	pdata = pdev->dev.platform_data;
 	if (!pdata) {
 		dev_err(dev, "cannot find device data\n");
 		return -EINVAL;
 	}

 	keymap_data = pdata->keymap_data;
 	if (!keymap_data) {
 		dev_err(dev, "cannot find keymap data\n");
 		return -EINVAL;
 	}

 	row_shift = get_count_order(pdata->num_col_gpios);
 	sz  = offsetof(struct keypad_data, keycodes);
 	sz += (pdata->num_row_gpios << row_shift) * sizeof(kp->keycodes[0]);
 	kp = kzalloc(sz, GFP_KERNEL);
 	if (!kp) {
 		dev_err(dev, "cannot allocate device info\n");
 		return -ENOMEM;
 	}

 	kp->dev  = dev;
 	kp->rows = pdata->num_row_gpios;
 	kp->cols = pdata->num_col_gpios;
 	kp->row_shift = row_shift;
 	platform_set_drvdata(pdev, kp);
 	spin_lock_init(&kp->lock);

 	kp->irq_press   = platform_get_irq_byname(pdev, "press");
 	kp->irq_release = platform_get_irq_byname(pdev, "release");
 	if (kp->irq_press < 0 || kp->irq_release < 0) {
 		dev_err(dev, "cannot determine device interrupts\n");
 		error = -ENODEV;
 		goto error_res;
 	}

 	kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!kp->res) {
 		dev_err(dev, "cannot determine register area\n");
 		error = -ENODEV;
 		goto error_res;
 	}

 	if (!request_mem_region(kp->res->start, resource_size(kp->res),
 				pdev->name)) {
 		dev_err(dev, "cannot claim register memory\n");
 		kp->res = NULL;
 		error = -EINVAL;
 		goto error_res;
 	}

 	kp->regs = ioremap(kp->res->start, resource_size(kp->res));
 	if (!kp->regs) {
 		dev_err(dev, "cannot map register memory\n");
 		error = -ENOMEM;
 		goto error_map;
 	}

 	kp->clk = clk_get(dev, NULL);
 	if (!kp->clk) {
 		dev_err(dev, "cannot claim device clock\n");
 		error = -EINVAL;
 		goto error_clk;
 	}

 	error = request_threaded_irq(kp->irq_press, NULL, keypad_irq, 0,
 				     dev_name(dev), kp);
 	if (error < 0) {
 		dev_err(kp->dev, "Could not allocate keypad press key irq\n");
 		goto error_irq_press;
 	}

 	error = request_threaded_irq(kp->irq_release, NULL, keypad_irq, 0,
 				     dev_name(dev), kp);
 	if (error < 0) {
 		dev_err(kp->dev, "Could not allocate keypad release key irq\n");
 		goto error_irq_release;
 	}

 	kp->input_dev = input_allocate_device();
 	if (!kp->input_dev) {
 		dev_err(dev, "cannot allocate input device\n");
 		error = -ENOMEM;
 		goto error_input;
 	}
 	input_set_drvdata(kp->input_dev, kp);

 	kp->input_dev->name	  = pdev->name;
 	kp->input_dev->dev.parent = &pdev->dev;
 	kp->input_dev->open	  = keypad_start;
 	kp->input_dev->close	  = keypad_stop;
 	kp->input_dev->evbit[0]	  = BIT_MASK(EV_KEY);
 	if (!pdata->no_autorepeat)
 		kp->input_dev->evbit[0] |= BIT_MASK(EV_REP);

 	clk_enable(kp->clk);
 	rev = keypad_read(kp, rev);
 	kp->input_dev->id.bustype = BUS_HOST;
 	kp->input_dev->id.product = ((rev >>  8) & 0x07);
 	kp->input_dev->id.version = ((rev >> 16) & 0xfff);
 	clk_disable(kp->clk);

 	kp->input_dev->keycode     = kp->keycodes;
 	kp->input_dev->keycodesize = sizeof(kp->keycodes[0]);
 	kp->input_dev->keycodemax  = kp->rows << kp->row_shift;

 	matrix_keypad_build_keymap(keymap_data, kp->row_shift, kp->keycodes,
 				   kp->input_dev->keybit);

 	input_set_capability(kp->input_dev, EV_MSC, MSC_SCAN);

 	error = input_register_device(kp->input_dev);
 	if (error < 0) {
 		dev_err(dev, "Could not register input device\n");
 		goto error_reg;
 	}

 	return 0;


 error_reg:
 	input_free_device(kp->input_dev);
 error_input:
 	free_irq(kp->irq_release, kp);
 error_irq_release:
 	free_irq(kp->irq_press, kp);
 error_irq_press:
 	clk_put(kp->clk);
 error_clk:
 	iounmap(kp->regs);
 error_map:
 	release_mem_region(kp->res->start, resource_size(kp->res));
 error_res:
 	platform_set_drvdata(pdev, NULL);
 	kfree(kp);
 	return error;
 }

 static int __devexit keypad_remove(struct platform_device *pdev)
 {
 	struct keypad_data *kp = platform_get_drvdata(pdev);

 	free_irq(kp->irq_press, kp);
 	free_irq(kp->irq_release, kp);
 	input_unregister_device(kp->input_dev);
 	clk_put(kp->clk);
 	iounmap(kp->regs);
 	release_mem_region(kp->res->start, resource_size(kp->res));
 	platform_set_drvdata(pdev, NULL);
 	kfree(kp);

 	return 0;
 }

 static struct platform_driver keypad_driver = {
 	.probe		= keypad_probe,
 	.remove		= __devexit_p(keypad_remove),
 	.driver.name	= "tnetv107x-keypad",
 	.driver.owner	= THIS_MODULE,
 };

 static int __init keypad_init(void)
 {
 	return platform_driver_register(&keypad_driver);
 }

 static void __exit keypad_exit(void)
 {
 	platform_driver_unregister(&keypad_driver);
 }

 module_init(keypad_init);
 module_exit(keypad_exit);

 MODULE_AUTHOR("Cyril Chemparathy");
 MODULE_DESCRIPTION("TNETV107X Keypad Driver");
 MODULE_ALIAS("platform: tnetv107x-keypad");
 MODULE_LICENSE("GPL");
	/*
	* Texas Instruments TNETV107X Keypad Driver
	*
	* Copyright (C) 2010 Texas Instruments
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/input.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/clk.h>
	#include <linux/input/matrix_keypad.h>

	#define BITS(x) (BIT(x) - 1)

	#define KEYPAD_ROWS 9
	#define KEYPAD_COLS 9

	#define DEBOUNCE_MIN 0x400ul
	#define DEBOUNCE_MAX 0x3ffffffful

	struct keypad_regs {
	u32 rev;
	u32 mode;
	u32 mask;
	u32 pol;
	u32 dclock;
	u32 rclock;
	u32 stable_cnt;
	u32 in_en;
	u32 out;
	u32 out_en;
	u32 in;
	u32 lock;
	u32 pres[3];
	};

	#define keypad_read(kp, reg) __raw_readl(&(kp)->regs->reg)
	#define keypad_write(kp, reg, val) __raw_writel(val, &(kp)->regs->reg)

	struct keypad_data {
	struct input_dev *input_dev;
	struct resource *res;
	struct keypad_regs __iomem *regs;
	struct clk *clk;
	struct device *dev;
	spinlock_t lock;
	u32 irq_press;
	u32 irq_release;
	int rows, cols, row_shift;
	int debounce_ms, active_low;
	u32 prev_keys[3];
	unsigned short keycodes[];
	};

	static irqreturn_t keypad_irq(int irq, void *data)
	{
	struct keypad_data *kp = data;
	int i, bit, val, row, col, code;
	unsigned long flags;
	u32 curr_keys[3];
	u32 change;

	spin_lock_irqsave(&kp->lock, flags);

	memset(curr_keys, 0, sizeof(curr_keys));
	if (irq == kp->irq_press)
	for (i = 0; i < 3; i++)
	curr_keys[i] = keypad_read(kp, pres[i]);

	for (i = 0; i < 3; i++) {
	change = curr_keys[i] ^ kp->prev_keys[i];

	while (change) {
	bit = fls(change) - 1;
	change ^= BIT(bit);
	val = curr_keys[i] & BIT(bit);
	bit += i * 32;
	row = bit / KEYPAD_COLS;
	col = bit % KEYPAD_COLS;

	code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
	input_event(kp->input_dev, EV_MSC, MSC_SCAN, code);
	input_report_key(kp->input_dev, kp->keycodes[code],
	val);
	}
	}
	input_sync(kp->input_dev);
	memcpy(kp->prev_keys, curr_keys, sizeof(curr_keys));

	if (irq == kp->irq_press)
	keypad_write(kp, lock, 0); /* Allow hardware updates */

	spin_unlock_irqrestore(&kp->lock, flags);

	return IRQ_HANDLED;
	}

	static int keypad_start(struct input_dev *dev)
	{
	struct keypad_data *kp = input_get_drvdata(dev);
	unsigned long mask, debounce, clk_rate_khz;
	unsigned long flags;

	clk_enable(kp->clk);
	clk_rate_khz = clk_get_rate(kp->clk) / 1000;

	spin_lock_irqsave(&kp->lock, flags);

	/* Initialize device registers */
	keypad_write(kp, mode, 0);

	mask = BITS(kp->rows) << KEYPAD_COLS;
	mask \|= BITS(kp->cols);
	keypad_write(kp, mask, ~mask);

	keypad_write(kp, pol, kp->active_low ? 0 : 0x3ffff);
	keypad_write(kp, stable_cnt, 3);

	debounce = kp->debounce_ms * clk_rate_khz;
	debounce = clamp(debounce, DEBOUNCE_MIN, DEBOUNCE_MAX);
	keypad_write(kp, dclock, debounce);
	keypad_write(kp, rclock, 4 * debounce);

	keypad_write(kp, in_en, 1);

	spin_unlock_irqrestore(&kp->lock, flags);

	return 0;
	}

	static void keypad_stop(struct input_dev *dev)
	{
	struct keypad_data *kp = input_get_drvdata(dev);

	synchronize_irq(kp->irq_press);
	synchronize_irq(kp->irq_release);
	clk_disable(kp->clk);
	}

	static int __devinit keypad_probe(struct platform_device *pdev)
	{
	const struct matrix_keypad_platform_data *pdata;
	const struct matrix_keymap_data *keymap_data;
	struct device *dev = &pdev->dev;
	struct keypad_data *kp;
	int error = 0, sz, row_shift;
	u32 rev = 0;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
	dev_err(dev, "cannot find device data\n");
	return -EINVAL;
	}

	keymap_data = pdata->keymap_data;
	if (!keymap_data) {
	dev_err(dev, "cannot find keymap data\n");
	return -EINVAL;
	}

	row_shift = get_count_order(pdata->num_col_gpios);
	sz = offsetof(struct keypad_data, keycodes);
	sz += (pdata->num_row_gpios << row_shift) * sizeof(kp->keycodes[0]);
	kp = kzalloc(sz, GFP_KERNEL);
	if (!kp) {
	dev_err(dev, "cannot allocate device info\n");
	return -ENOMEM;
	}

	kp->dev = dev;
	kp->rows = pdata->num_row_gpios;
	kp->cols = pdata->num_col_gpios;
	kp->row_shift = row_shift;
	platform_set_drvdata(pdev, kp);
	spin_lock_init(&kp->lock);

	kp->irq_press = platform_get_irq_byname(pdev, "press");
	kp->irq_release = platform_get_irq_byname(pdev, "release");
	if (kp->irq_press < 0 \|\| kp->irq_release < 0) {
	dev_err(dev, "cannot determine device interrupts\n");
	error = -ENODEV;
	goto error_res;
	}

	kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!kp->res) {
	dev_err(dev, "cannot determine register area\n");
	error = -ENODEV;
	goto error_res;
	}

	if (!request_mem_region(kp->res->start, resource_size(kp->res),
	pdev->name)) {
	dev_err(dev, "cannot claim register memory\n");
	kp->res = NULL;
	error = -EINVAL;
	goto error_res;
	}

	kp->regs = ioremap(kp->res->start, resource_size(kp->res));
	if (!kp->regs) {
	dev_err(dev, "cannot map register memory\n");
	error = -ENOMEM;
	goto error_map;
	}

	kp->clk = clk_get(dev, NULL);
	if (!kp->clk) {
	dev_err(dev, "cannot claim device clock\n");
	error = -EINVAL;
	goto error_clk;
	}

	error = request_threaded_irq(kp->irq_press, NULL, keypad_irq, 0,
	dev_name(dev), kp);
	if (error < 0) {
	dev_err(kp->dev, "Could not allocate keypad press key irq\n");
	goto error_irq_press;
	}

	error = request_threaded_irq(kp->irq_release, NULL, keypad_irq, 0,
	dev_name(dev), kp);
	if (error < 0) {
	dev_err(kp->dev, "Could not allocate keypad release key irq\n");
	goto error_irq_release;
	}

	kp->input_dev = input_allocate_device();
	if (!kp->input_dev) {
	dev_err(dev, "cannot allocate input device\n");
	error = -ENOMEM;
	goto error_input;
	}
	input_set_drvdata(kp->input_dev, kp);

	kp->input_dev->name = pdev->name;
	kp->input_dev->dev.parent = &pdev->dev;
	kp->input_dev->open = keypad_start;
	kp->input_dev->close = keypad_stop;
	kp->input_dev->evbit[0] = BIT_MASK(EV_KEY);
	if (!pdata->no_autorepeat)
	kp->input_dev->evbit[0] \|= BIT_MASK(EV_REP);

	clk_enable(kp->clk);
	rev = keypad_read(kp, rev);
	kp->input_dev->id.bustype = BUS_HOST;
	kp->input_dev->id.product = ((rev >> 8) & 0x07);
	kp->input_dev->id.version = ((rev >> 16) & 0xfff);
	clk_disable(kp->clk);

	kp->input_dev->keycode = kp->keycodes;
	kp->input_dev->keycodesize = sizeof(kp->keycodes[0]);
	kp->input_dev->keycodemax = kp->rows << kp->row_shift;

	matrix_keypad_build_keymap(keymap_data, kp->row_shift, kp->keycodes,
	kp->input_dev->keybit);

	input_set_capability(kp->input_dev, EV_MSC, MSC_SCAN);

	error = input_register_device(kp->input_dev);
	if (error < 0) {
	dev_err(dev, "Could not register input device\n");
	goto error_reg;
	}

	return 0;


	error_reg:
	input_free_device(kp->input_dev);
	error_input:
	free_irq(kp->irq_release, kp);
	error_irq_release:
	free_irq(kp->irq_press, kp);
	error_irq_press:
	clk_put(kp->clk);
	error_clk:
	iounmap(kp->regs);
	error_map:
	release_mem_region(kp->res->start, resource_size(kp->res));
	error_res:
	platform_set_drvdata(pdev, NULL);
	kfree(kp);
	return error;
	}

	static int __devexit keypad_remove(struct platform_device *pdev)
	{
	struct keypad_data *kp = platform_get_drvdata(pdev);

	free_irq(kp->irq_press, kp);
	free_irq(kp->irq_release, kp);
	input_unregister_device(kp->input_dev);
	clk_put(kp->clk);
	iounmap(kp->regs);
	release_mem_region(kp->res->start, resource_size(kp->res));
	platform_set_drvdata(pdev, NULL);
	kfree(kp);

	return 0;
	}

	static struct platform_driver keypad_driver = {
	.probe = keypad_probe,
	.remove = __devexit_p(keypad_remove),
	.driver.name = "tnetv107x-keypad",
	.driver.owner = THIS_MODULE,
	};

	static int __init keypad_init(void)
	{
	return platform_driver_register(&keypad_driver);
	}

	static void __exit keypad_exit(void)
	{
	platform_driver_unregister(&keypad_driver);
	}

	module_init(keypad_init);
	module_exit(keypad_exit);

	MODULE_AUTHOR("Cyril Chemparathy");
	MODULE_DESCRIPTION("TNETV107X Keypad Driver");
	MODULE_ALIAS("platform: tnetv107x-keypad");
	MODULE_LICENSE("GPL");