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/*
* 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/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 <linux/slab.h>
#include <linux/platform_data/keypad-w90p910.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 W90P910_NUM_ROWS 8
#define W90P910_NUM_COLS 8
#define W90P910_ROW_SHIFT 3
struct w90p910_keypad {
const struct w90p910_keypad_platform_data *pdata;
struct clk *clk;
struct input_dev *input_dev;
void __iomem *mmio_base;
int irq;
unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
};
static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
unsigned int status)
{
struct input_dev *input_dev = keypad->input_dev;
unsigned int row = KGET_RAW(status);
unsigned int col = KGET_COLUMN(status);
unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
unsigned int key = keypad->keymap[code];
input_event(input_dev, EV_MSC, MSC_SCAN, code);
input_report_key(input_dev, key, 1);
input_sync(input_dev);
input_event(input_dev, EV_MSC, MSC_SCAN, code);
input_report_key(input_dev, key, 0);
input_sync(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);
const 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 w90p910_keypad_probe(struct platform_device *pdev)
{
const struct w90p910_keypad_platform_data *pdata =
dev_get_platdata(&pdev->dev);
const struct matrix_keymap_data *keymap_data;
struct w90p910_keypad *keypad;
struct input_dev *input_dev;
struct resource *res;
int irq;
int error;
if (!pdata) {
dev_err(&pdev->dev, "no platform data defined\n");
return -EINVAL;
}
keymap_data = pdata->keymap_data;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get keypad irq\n");
return -ENXIO;
}
keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
input_dev = input_allocate_device();
if (!keypad || !input_dev) {
dev_err(&pdev->dev, "failed to allocate driver data\n");
error = -ENOMEM;
goto failed_free;
}
keypad->pdata = pdata;
keypad->input_dev = input_dev;
keypad->irq = irq;
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_res;
}
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;
}
/* 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;
error = matrix_keypad_build_keymap(keymap_data, NULL,
W90P910_NUM_ROWS, W90P910_NUM_COLS,
keypad->keymap, input_dev);
if (error) {
dev_err(&pdev->dev, "failed to build keymap\n");
goto failed_put_clk;
}
error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
0, pdev->name, keypad);
if (error) {
dev_err(&pdev->dev, "failed to request IRQ\n");
goto failed_put_clk;
}
__set_bit(EV_REP, input_dev->evbit);
input_set_capability(input_dev, EV_MSC, MSC_SCAN);
input_set_drvdata(input_dev, keypad);
/* 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;
}
platform_set_drvdata(pdev, keypad);
return 0;
failed_free_irq:
free_irq(irq, keypad);
failed_put_clk:
clk_put(keypad->clk);
failed_free_io:
iounmap(keypad->mmio_base);
failed_free_res:
release_mem_region(res->start, resource_size(res));
failed_free:
input_free_device(input_dev);
kfree(keypad);
return error;
}
static int w90p910_keypad_remove(struct platform_device *pdev)
{
struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
struct resource *res;
free_irq(keypad->irq, keypad);
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));
kfree(keypad);
return 0;
}
static struct platform_driver w90p910_keypad_driver = {
.probe = w90p910_keypad_probe,
.remove = w90p910_keypad_remove,
.driver = {
.name = "nuc900-kpi",
.owner = THIS_MODULE,
},
};
module_platform_driver(w90p910_keypad_driver);
MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("w90p910 keypad driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nuc900-keypad");
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