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Commit 70614084 authored by Cyril Chemparathy's avatar Cyril Chemparathy Committed by Kevin Hilman
Browse files

input: add driver for tnetv107x on-chip keypad controller 



This patch adds support for tnetv107x's on-chip keypad controller.

Signed-off-by: default avatarCyril Chemparathy <cyril@ti.com>
Acked-by: default avatarDmitry Torokhov <dtor@mail.ru>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent d4ef0d42

drivers/input/keyboard/Kconfig

+9 −0
Original line number Original line Diff line number Diff line
@@ -424,6 +424,15 @@ config KEYBOARD_OMAP 
	  To compile this driver as a module, choose M here: the

	  To compile this driver as a module, choose M here: the

	  module will be called omap-keypad.

	  module will be called omap-keypad.





config KEYBOARD_TNETV107X

	tristate "TI TNETV107X keypad support"

	depends on ARCH_DAVINCI_TNETV107X

	help

	  Say Y here if you want to use the TNETV107X keypad.



	  To compile this driver as a module, choose M here: the

	  module will be called tnetv107x-keypad.



config KEYBOARD_TWL4030

config KEYBOARD_TWL4030

	tristate "TI TWL4030/TWL5030/TPS659x0 keypad support"

	tristate "TI TWL4030/TWL5030/TPS659x0 keypad support"

	depends on TWL4030_CORE

	depends on TWL4030_CORE

drivers/input/keyboard/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -38,6 +38,7 @@ obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o 
obj-$(CONFIG_KEYBOARD_STMPE)		+= stmpe-keypad.o

obj-$(CONFIG_KEYBOARD_STMPE)		+= stmpe-keypad.o

obj-$(CONFIG_KEYBOARD_STOWAWAY)		+= stowaway.o

obj-$(CONFIG_KEYBOARD_STOWAWAY)		+= stowaway.o

obj-$(CONFIG_KEYBOARD_SUNKBD)		+= sunkbd.o

obj-$(CONFIG_KEYBOARD_SUNKBD)		+= sunkbd.o

obj-$(CONFIG_KEYBOARD_TNETV107X)	+= tnetv107x-keypad.o

obj-$(CONFIG_KEYBOARD_TWL4030)		+= twl4030_keypad.o

obj-$(CONFIG_KEYBOARD_TWL4030)		+= twl4030_keypad.o

obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o

obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o

obj-$(CONFIG_KEYBOARD_W90P910)		+= w90p910_keypad.o
 
obj-$(CONFIG_KEYBOARD_W90P910)		+= w90p910_keypad.o

drivers/input/keyboard/tnetv107x-keypad.c

0 → 100644
+340 −0
Original line number Original line Diff line number Diff line 
/*

 * 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");