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Input: add matrix keypad driver for Cirrus EP93xx

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This is a keyboard driver for the Cirrus Logic EP93xx keypad matrix
peripheral. This driver is based on the pxa27x_keypad driver.

[dtor@mail.ru: Plug in input_dev->keycode so keymap can be changed
		from userspace.]
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
H Hartley Sweeten 2009-04-18 23:43:57 -07:00 committed by Dmitry Torokhov
parent 864fe73c31
commit e06003af56
4 changed files with 523 additions and 0 deletions
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42
arch/arm/mach-ep93xx/include/mach/ep93xx_keypad.h Normal file
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@ -0,0 +1,42 @@
/*
* arch/arm/mach-ep93xx/include/mach/ep93xx_keypad.h
*/
#ifndef __ASM_ARCH_EP93XX_KEYPAD_H
#define __ASM_ARCH_EP93XX_KEYPAD_H
#define MAX_MATRIX_KEY_ROWS (8)
#define MAX_MATRIX_KEY_COLS (8)
/* flags for the ep93xx_keypad driver */
#define EP93XX_KEYPAD_DISABLE_3_KEY (1<<0) /* disable 3-key reset */
#define EP93XX_KEYPAD_DIAG_MODE (1<<1) /* diagnostic mode */
#define EP93XX_KEYPAD_BACK_DRIVE (1<<2) /* back driving mode */
#define EP93XX_KEYPAD_TEST_MODE (1<<3) /* scan only column 0 */
#define EP93XX_KEYPAD_KDIV (1<<4) /* 1/4 clock or 1/16 clock */
#define EP93XX_KEYPAD_AUTOREPEAT (1<<5) /* enable key autorepeat */
/**
* struct ep93xx_keypad_platform_data - platform specific device structure
* @matrix_key_rows: number of rows in the keypad matrix
* @matrix_key_cols: number of columns in the keypad matrix
* @matrix_key_map: array of keycodes defining the keypad matrix
* @matrix_key_map_size: ARRAY_SIZE(matrix_key_map)
* @debounce: debounce start count; terminal count is 0xff
* @prescale: row/column counter pre-scaler load value
* @flags: see above
*/
struct ep93xx_keypad_platform_data {
unsigned int matrix_key_rows;
unsigned int matrix_key_cols;
unsigned int *matrix_key_map;
int matrix_key_map_size;
unsigned int debounce;
unsigned int prescale;
unsigned int flags;
};
/* macro for creating the matrix_key_map table */
#define KEY(row, col, val) (((row) << 28) | ((col) << 24) | (val))
#endif /* __ASM_ARCH_EP93XX_KEYPAD_H */

10
drivers/input/keyboard/Kconfig
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@ -332,4 +332,14 @@ config KEYBOARD_SH_KEYSC
To compile this driver as a module, choose M here: the
module will be called sh_keysc.
+
config KEYBOARD_EP93XX
tristate "EP93xx Matrix Keypad support"
depends on ARCH_EP93XX
help
Say Y here to enable the matrix keypad on the Cirrus EP93XX.
To compile this driver as a module, choose M here: the
module will be called ep93xx_keypad.
endif

1
drivers/input/keyboard/Makefile
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@ -28,3 +28,4 @@ obj-$(CONFIG_KEYBOARD_HP7XX) += jornada720_kbd.o
obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o
obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o
obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o

470
drivers/input/keyboard/ep93xx_keypad.c Normal file
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@ -0,0 +1,470 @@
/*
* 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/input.h>
#include <linux/clk.h>
#include <mach/hardware.h>
#include <mach/gpio.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 keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
#define keypad_writel(v, off) __raw_writel((v), keypad->mmio_base + (off))
#define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
struct ep93xx_keypad {
struct ep93xx_keypad_platform_data *pdata;
struct clk *clk;
struct input_dev *input_dev;
void __iomem *mmio_base;
int irq;
int enabled;
int key1;
int key2;
unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
};
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;
int i;
for (i = 0; i < pdata->matrix_key_map_size; i++) {
unsigned int key = pdata->matrix_key_map[i];
int row = (key >> 28) & 0xf;
int col = (key >> 24) & 0xf;
int code = key & 0xffffff;
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 = keypad_readl(KEY_REG);
int keycode, key1, key2;
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;
clk_set_rate(keypad->clk, pdata->flags & EP93XX_KEYPAD_KDIV);
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);
keypad_writel(val, 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 = 1;
}
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 = 0;
}
}
#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 = 0;
}
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 = 1;
}
}
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 ep93xx_keypad_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input_dev;
struct resource *res;
int irq, err, i, gpio;
if (!pdata ||
!pdata->matrix_key_rows ||
pdata->matrix_key_rows > MAX_MATRIX_KEY_ROWS ||
!pdata->matrix_key_cols ||
pdata->matrix_key_cols > MAX_MATRIX_KEY_COLS) {
dev_err(&pdev->dev, "invalid or missing platform data\n");
return -EINVAL;
}
keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
if (!keypad) {
dev_err(&pdev->dev, "failed to allocate driver data\n");
return -ENOMEM;
}
keypad->pdata = pdata;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get keypad irq\n");
err = -ENXIO;
goto failed_free;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get I/O memory\n");
err = -ENXIO;
goto failed_free;
}
res = request_mem_region(res->start, resource_size(res), pdev->name);
if (!res) {
dev_err(&pdev->dev, "failed to request I/O memory\n");
err = -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");
err = -ENXIO;
goto failed_free_mem;
}
/* Request the needed GPIO's */
gpio = EP93XX_GPIO_LINE_ROW0;
for (i = 0; i < keypad->pdata->matrix_key_rows; i++, gpio++) {
err = gpio_request(gpio, pdev->name);
if (err) {
dev_err(&pdev->dev, "failed to request gpio-%d\n",
gpio);
goto failed_free_rows;
}
}
gpio = EP93XX_GPIO_LINE_COL0;
for (i = 0; i < keypad->pdata->matrix_key_cols; i++, gpio++) {
err = gpio_request(gpio, pdev->name);
if (err) {
dev_err(&pdev->dev, "failed to request gpio-%d\n",
gpio);
goto failed_free_cols;
}
}
keypad->clk = clk_get(&pdev->dev, "key_clk");
if (IS_ERR(keypad->clk)) {
dev_err(&pdev->dev, "failed to get keypad clock\n");
err = 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");
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(irq, ep93xx_keypad_irq_handler, IRQF_DISABLED,
pdev->name, keypad);
if (err) {
dev_err(&pdev->dev, "failed to request IRQ\n");
goto failed_free_dev;
}
keypad->irq = irq;
/* Register the input device */
err = input_register_device(input_dev);
if (err) {
dev_err(&pdev->dev, "failed to register input device\n");
goto failed_free_irq;
}
device_init_wakeup(&pdev->dev, 1);
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:
i = keypad->pdata->matrix_key_cols - 1;
gpio = EP93XX_GPIO_LINE_COL0 + i;
failed_free_cols:
for ( ; i >= 0; i--, gpio--)
gpio_free(gpio);
i = keypad->pdata->matrix_key_rows - 1;
gpio = EP93XX_GPIO_LINE_ROW0 + i;
failed_free_rows:
for ( ; i >= 0; i--, gpio--)
gpio_free(gpio);
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;
int i, gpio;
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);
i = keypad->pdata->matrix_key_cols - 1;
gpio = EP93XX_GPIO_LINE_COL0 + i;
for ( ; i >= 0; i--, gpio--)
gpio_free(gpio);
i = keypad->pdata->matrix_key_rows - 1;
gpio = EP93XX_GPIO_LINE_ROW0 + i;
for ( ; i >= 0; i--, gpio--)
gpio_free(gpio);
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");