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/*
* Driver for the Cirrus EP93xx matrix keypad controller.
*
* Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
*
* Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* NOTE:
*
* The 3-key reset is triggered by pressing the 3 keys in
* Row 0, Columns 2, 4, and 7 at the same time. This action can
* be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
*
* Normal operation for the matrix does not autorepeat the key press.
* This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
* flag.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/input/matrix_keypad.h>
#include <linux/slab.h>
#include <mach/hardware.h>
#include <linux/platform_data/keypad-ep93xx.h>
/*
* Keypad Interface Register offsets
*/
#define KEY_INIT 0x00 /* Key Scan Initialization register */
#define KEY_DIAG 0x04 /* Key Scan Diagnostic register */
#define KEY_REG 0x08 /* Key Value Capture register */
/* Key Scan Initialization Register bit defines */
#define KEY_INIT_DBNC_MASK (0x00ff0000)
#define KEY_INIT_DBNC_SHIFT (16)
#define KEY_INIT_DIS3KY (1<<15)
#define KEY_INIT_DIAG (1<<14)
#define KEY_INIT_BACK (1<<13)
#define KEY_INIT_T2 (1<<12)
#define KEY_INIT_PRSCL_MASK (0x000003ff)
#define KEY_INIT_PRSCL_SHIFT (0)
/* Key Scan Diagnostic Register bit defines */
#define KEY_DIAG_MASK (0x0000003f)
#define KEY_DIAG_SHIFT (0)
/* Key Value Capture Register bit defines */
#define KEY_REG_K (1<<15)
#define KEY_REG_INT (1<<14)
#define KEY_REG_2KEYS (1<<13)
#define KEY_REG_1KEY (1<<12)
#define KEY_REG_KEY2_MASK (0x00000fc0)
#define KEY_REG_KEY2_SHIFT (6)
#define KEY_REG_KEY1_MASK (0x0000003f)
#define KEY_REG_KEY1_SHIFT (0)
#define EP93XX_MATRIX_SIZE (EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)
struct ep93xx_keypad {
struct ep93xx_keypad_platform_data *pdata;
struct input_dev *input_dev;
struct clk *clk;
void __iomem *mmio_base;
unsigned short keycodes[EP93XX_MATRIX_SIZE];
int key1;
int key2;
int irq;
bool enabled;
};
static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
{
struct ep93xx_keypad *keypad = dev_id;
struct input_dev *input_dev = keypad->input_dev;
unsigned int status;
int keycode, key1, key2;
status = __raw_readl(keypad->mmio_base + KEY_REG);
keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
key1 = keypad->keycodes[keycode];
keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
key2 = keypad->keycodes[keycode];
if (status & KEY_REG_2KEYS) {
if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
input_report_key(input_dev, keypad->key1, 0);
if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
input_report_key(input_dev, keypad->key2, 0);
input_report_key(input_dev, key1, 1);
input_report_key(input_dev, key2, 1);
keypad->key1 = key1;
keypad->key2 = key2;
} else if (status & KEY_REG_1KEY) {
if (keypad->key1 && key1 != keypad->key1)
input_report_key(input_dev, keypad->key1, 0);
if (keypad->key2 && key1 != keypad->key2)
input_report_key(input_dev, keypad->key2, 0);
input_report_key(input_dev, key1, 1);
keypad->key1 = key1;
keypad->key2 = 0;
} else {
input_report_key(input_dev, keypad->key1, 0);
input_report_key(input_dev, keypad->key2, 0);
keypad->key1 = keypad->key2 = 0;
}
input_sync(input_dev);
return IRQ_HANDLED;
}
static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
{
struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
unsigned int val = 0;
if (pdata->flags & EP93XX_KEYPAD_KDIV)
clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV4);
else
clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV16);
if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
val |= KEY_INIT_DIS3KY;
if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
val |= KEY_INIT_DIAG;
if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
val |= KEY_INIT_BACK;
if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
val |= KEY_INIT_T2;
val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
__raw_writel(val, keypad->mmio_base + KEY_INIT);
}
static int ep93xx_keypad_open(struct input_dev *pdev)
{
struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
if (!keypad->enabled) {
ep93xx_keypad_config(keypad);
clk_enable(keypad->clk);
keypad->enabled = true;
}
return 0;
}
static void ep93xx_keypad_close(struct input_dev *pdev)
{
struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
if (keypad->enabled) {
clk_disable(keypad->clk);
keypad->enabled = false;
}
}
#ifdef CONFIG_PM_SLEEP
static int ep93xx_keypad_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
struct input_dev *input_dev = keypad->input_dev;
mutex_lock(&input_dev->mutex);
if (keypad->enabled) {
clk_disable(keypad->clk);
keypad->enabled = false;
}
mutex_unlock(&input_dev->mutex);
if (device_may_wakeup(&pdev->dev))
enable_irq_wake(keypad->irq);
return 0;
}
static int ep93xx_keypad_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
struct input_dev *input_dev = keypad->input_dev;
if (device_may_wakeup(&pdev->dev))
disable_irq_wake(keypad->irq);
mutex_lock(&input_dev->mutex);
if (input_dev->users) {
if (!keypad->enabled) {
ep93xx_keypad_config(keypad);
clk_enable(keypad->clk);
keypad->enabled = true;
}
}
mutex_unlock(&input_dev->mutex);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
ep93xx_keypad_suspend, ep93xx_keypad_resume);
static int __devinit ep93xx_keypad_probe(struct platform_device *pdev)
{
struct ep93xx_keypad *keypad;
const struct matrix_keymap_data *keymap_data;
struct input_dev *input_dev;
struct resource *res;
int err;
keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
if (!keypad)
return -ENOMEM;
keypad->pdata = pdev->dev.platform_data;
if (!keypad->pdata) {
err = -EINVAL;
goto failed_free;
}
keymap_data = keypad->pdata->keymap_data;
if (!keymap_data) {
err = -EINVAL;
goto failed_free;
}
keypad->irq = platform_get_irq(pdev, 0);
if (!keypad->irq) {
err = -ENXIO;
goto failed_free;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
err = -ENXIO;
goto failed_free;
}
res = request_mem_region(res->start, resource_size(res), pdev->name);
if (!res) {
err = -EBUSY;
goto failed_free;
}
keypad->mmio_base = ioremap(res->start, resource_size(res));
if (keypad->mmio_base == NULL) {
err = -ENXIO;
goto failed_free_mem;
}
err = ep93xx_keypad_acquire_gpio(pdev);
if (err)
goto failed_free_io;
keypad->clk = clk_get(&pdev->dev, NULL);
if (
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