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linux/drivers/input/keyboard/ep93xx_keypad.c
H Hartley Sweeten 60214f058f Input: ep93xx_keypad - update driver to new core support 
This driver was merged before the ep93xx core support was added
for the keypad clock and acquiring/releasing the necessary gpio's.
Now that the proper support is in the ep93xx core this driver
needs to be updated to work correctly.

Summary of changes:
  1) Remove some unused members from the platform data.
  2) Remove the custom KEY macro and use the ones available in
     <linux/input/matrix_keypad.h>
  3) Remove the keypad_{readl/writel} macros and just use
     __raw_{readl/writel} directly.
  4) Update the clk_set_rate() call to work with the core support.
  5) Cleanup the probe routine and remove some unneeded messages.
  6) Use the ep93xx core functions to acquire and release the gpio's.
  7) Fix the clk_get() call to get the keypad clock.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-12-15 08:54:45 -08:00

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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/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/input/matrix_keypad.h>
#include <mach/hardware.h>
#include <mach/ep93xx_keypad.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 int matrix_keycodes[EP93XX_MATRIX_SIZE];
int key1;
int key2;
int irq;
bool enabled;
};
static void ep93xx_keypad_build_keycode(struct ep93xx_keypad *keypad)
{
struct ep93xx_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 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->matrix_keycodes[keycode];
keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
key2 = keypad->matrix_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
/*
* NOTE: I don't know if this is correct, or will work on the ep93xx.
*
* None of the existing ep93xx drivers have power management support.
* But, this is basically what the pxa27x_keypad driver does.
*/
static int ep93xx_keypad_suspend(struct platform_device *pdev,
pm_message_t state)
{
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 platform_device *pdev)
{
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;
}
#else /* !CONFIG_PM */
#define ep93xx_keypad_suspend NULL
#define ep93xx_keypad_resume NULL
#endif /* !CONFIG_PM */
static int __devinit ep93xx_keypad_probe(struct platform_device *pdev)
{
struct ep93xx_keypad *keypad;
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;
}
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 (IS_ERR(keypad->clk)) {
err = PTR_ERR(keypad->clk);
goto failed_free_gpio;
}
input_dev = input_allocate_device();
if (!input_dev) {
err = -ENOMEM;
goto failed_put_clk;
}
keypad->input_dev = input_dev;
input_dev->name = pdev->name;
input_dev->id.bustype = BUS_HOST;
input_dev->open = ep93xx_keypad_open;
input_dev->close = ep93xx_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);
input_set_drvdata(input_dev, keypad);
input_dev->evbit[0] = BIT_MASK(EV_KEY);
if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
input_dev->evbit[0] |= BIT_MASK(EV_REP);
ep93xx_keypad_build_keycode(keypad);
platform_set_drvdata(pdev, keypad);
err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
IRQF_DISABLED, pdev->name, keypad);
if (err)
goto failed_free_dev;
err = input_register_device(input_dev);
if (err)
goto failed_free_irq;
device_init_wakeup(&pdev->dev, 1);
return 0;
failed_free_irq:
free_irq(keypad->irq, pdev);
platform_set_drvdata(pdev, NULL);
failed_free_dev:
input_free_device(input_dev);
failed_put_clk:
clk_put(keypad->clk);
failed_free_gpio:
ep93xx_keypad_release_gpio(pdev);
failed_free_io:
iounmap(keypad->mmio_base);
failed_free_mem:
release_mem_region(res->start, resource_size(res));
failed_free:
kfree(keypad);
return err;
}
static int __devexit ep93xx_keypad_remove(struct platform_device *pdev)
{
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
struct resource *res;
free_irq(keypad->irq, pdev);
platform_set_drvdata(pdev, NULL);
if (keypad->enabled)
clk_disable(keypad->clk);
clk_put(keypad->clk);
input_unregister_device(keypad->input_dev);
ep93xx_keypad_release_gpio(pdev);
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 ep93xx_keypad_driver = {
.driver = {
.name = "ep93xx-keypad",
.owner = THIS_MODULE,
},
.probe = ep93xx_keypad_probe,
.remove = __devexit_p(ep93xx_keypad_remove),
.suspend = ep93xx_keypad_suspend,
.resume = ep93xx_keypad_resume,
};
static int __init ep93xx_keypad_init(void)
{
return platform_driver_register(&ep93xx_keypad_driver);
}
static void __exit ep93xx_keypad_exit(void)
{
platform_driver_unregister(&ep93xx_keypad_driver);
}
module_init(ep93xx_keypad_init);
module_exit(ep93xx_keypad_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
MODULE_ALIAS("platform:ep93xx-keypad");
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