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linux-next/drivers/input/keyboard/w90p910_keypad.c
Wan ZongShun 4a15235e79 Input: add keypad driver for w90p910
Add keypad driver for the 4x4 keypad on an evaluation board based
on w90p910.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Reviewed-by: Trilok Soni <soni.trilok@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-08-09 21:24:09 -07:00

306 lines
7.3 KiB
C

/*
* Copyright (c) 2008-2009 Nuvoton technology corporation.
*
* Wan ZongShun <mcuos.com@gmail.com>
*
* 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 of the License.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <mach/w90p910_keypad.h>
/* Keypad Interface Control Registers */
#define KPI_CONF 0x00
#define KPI_3KCONF 0x04
#define KPI_LPCONF 0x08
#define KPI_STATUS 0x0C
#define IS1KEY (0x01 << 16)
#define INTTR (0x01 << 21)
#define KEY0R (0x0f << 3)
#define KEY0C 0x07
#define DEBOUNCE_BIT 0x08
#define KSIZE0 (0x01 << 16)
#define KSIZE1 (0x01 << 17)
#define KPSEL (0x01 << 19)
#define ENKP (0x01 << 18)
#define KGET_RAW(n) (((n) & KEY0R) >> 3)
#define KGET_COLUMN(n) ((n) & KEY0C)
#define MAX_MATRIX_KEY_NUM (8 * 8)
struct w90p910_keypad {
struct w90p910_keypad_platform_data *pdata;
struct clk *clk;
struct input_dev *input_dev;
void __iomem *mmio_base;
int irq;
unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
};
static void w90p910_keypad_build_keycode(struct w90p910_keypad *keypad)
{
struct w90p910_keypad_platform_data *pdata = keypad->pdata;
struct input_dev *input_dev = keypad->input_dev;
unsigned int *key;
int i;
key = &pdata->matrix_key_map[0];
for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
int row = KEY_ROW(*key);
int col = KEY_COL(*key);
int code = KEY_VAL(*key);
keypad->matrix_keycodes[(row << 3) + col] = code;
__set_bit(code, input_dev->keybit);
}
}
static inline unsigned int lookup_matrix_keycode(
struct w90p910_keypad *keypad, int row, int col)
{
return keypad->matrix_keycodes[(row << 3) + col];
}
static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
unsigned int status)
{
unsigned int row, col, val;
row = KGET_RAW(status);
col = KGET_COLUMN(status);
val = lookup_matrix_keycode(keypad, row, col);
input_report_key(keypad->input_dev, val, 1);
input_sync(keypad->input_dev);
input_report_key(keypad->input_dev, val, 0);
input_sync(keypad->input_dev);
}
static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
{
struct w90p910_keypad *keypad = dev_id;
unsigned int kstatus, val;
kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
val = INTTR | IS1KEY;
if (kstatus & val)
w90p910_keypad_scan_matrix(keypad, kstatus);
return IRQ_HANDLED;
}
static int w90p910_keypad_open(struct input_dev *dev)
{
struct w90p910_keypad *keypad = input_get_drvdata(dev);
struct w90p910_keypad_platform_data *pdata = keypad->pdata;
unsigned int val, config;
/* Enable unit clock */
clk_enable(keypad->clk);
val = __raw_readl(keypad->mmio_base + KPI_CONF);
val |= (KPSEL | ENKP);
val &= ~(KSIZE0 | KSIZE1);
config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
val |= config;
__raw_writel(val, keypad->mmio_base + KPI_CONF);
return 0;
}
static void w90p910_keypad_close(struct input_dev *dev)
{
struct w90p910_keypad *keypad = input_get_drvdata(dev);
/* Disable clock unit */
clk_disable(keypad->clk);
}
static int __devinit w90p910_keypad_probe(struct platform_device *pdev)
{
struct w90p910_keypad *keypad;
struct input_dev *input_dev;
struct resource *res;
int irq, error;
keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
if (keypad == NULL) {
dev_err(&pdev->dev, "failed to allocate driver data\n");
return -ENOMEM;
}
keypad->pdata = pdev->dev.platform_data;
if (keypad->pdata == NULL) {
dev_err(&pdev->dev, "no platform data defined\n");
error = -EINVAL;
goto failed_free;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get keypad irq\n");
error = -ENXIO;
goto failed_free;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "failed to get I/O memory\n");
error = -ENXIO;
goto failed_free;
}
res = request_mem_region(res->start, resource_size(res), pdev->name);
if (res == NULL) {
dev_err(&pdev->dev, "failed to request I/O memory\n");
error = -EBUSY;
goto failed_free;
}
keypad->mmio_base = ioremap(res->start, resource_size(res));
if (keypad->mmio_base == NULL) {
dev_err(&pdev->dev, "failed to remap I/O memory\n");
error = -ENXIO;
goto failed_free_mem;
}
keypad->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(keypad->clk)) {
dev_err(&pdev->dev, "failed to get keypad clock\n");
error = PTR_ERR(keypad->clk);
goto failed_free_io;
}
/* Create and register the input driver. */
input_dev = input_allocate_device();
if (!input_dev) {
dev_err(&pdev->dev, "failed to allocate input device\n");
error = -ENOMEM;
goto failed_put_clk;
}
/* set multi-function pin for w90p910 kpi. */
mfp_set_groupi(&pdev->dev);
input_dev->name = pdev->name;
input_dev->id.bustype = BUS_HOST;
input_dev->open = w90p910_keypad_open;
input_dev->close = w90p910_keypad_close;
input_dev->dev.parent = &pdev->dev;
input_dev->keycode = keypad->matrix_keycodes;
input_dev->keycodesize = sizeof(keypad->matrix_keycodes[0]);
input_dev->keycodemax = ARRAY_SIZE(keypad->matrix_keycodes);
keypad->input_dev = input_dev;
input_set_drvdata(input_dev, keypad);
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
w90p910_keypad_build_keycode(keypad);
platform_set_drvdata(pdev, keypad);
error = request_irq(irq, w90p910_keypad_irq_handler, IRQF_DISABLED,
pdev->name, keypad);
if (error) {
dev_err(&pdev->dev, "failed to request IRQ\n");
goto failed_free_dev;
}
keypad->irq = irq;
/* Register the input device */
error = input_register_device(input_dev);
if (error) {
dev_err(&pdev->dev, "failed to register input device\n");
goto failed_free_irq;
}
return 0;
failed_free_irq:
free_irq(irq, pdev);
platform_set_drvdata(pdev, NULL);
failed_free_dev:
input_free_device(input_dev);
failed_put_clk:
clk_put(keypad->clk);
failed_free_io:
iounmap(keypad->mmio_base);
failed_free_mem:
release_mem_region(res->start, resource_size(res));
failed_free:
kfree(keypad);
return error;
}
static int __devexit w90p910_keypad_remove(struct platform_device *pdev)
{
struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
struct resource *res;
free_irq(keypad->irq, pdev);
clk_put(keypad->clk);
input_unregister_device(keypad->input_dev);
iounmap(keypad->mmio_base);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
platform_set_drvdata(pdev, NULL);
kfree(keypad);
return 0;
}
static struct platform_driver w90p910_keypad_driver = {
.probe = w90p910_keypad_probe,
.remove = __devexit_p(w90p910_keypad_remove),
.driver = {
.name = "w90p910-keypad",
.owner = THIS_MODULE,
},
};
static int __init w90p910_keypad_init(void)
{
return platform_driver_register(&w90p910_keypad_driver);
}
static void __exit w90p910_keypad_exit(void)
{
platform_driver_unregister(&w90p910_keypad_driver);
}
module_init(w90p910_keypad_init);
module_exit(w90p910_keypad_exit);
MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("w90p910 keypad driver!");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:w90p910-keypad");