/*
* linux/drivers/input/keyboard/pxa27x_keyboard.c
*
* Driver for the pxa27x matrix keyboard controller.
*
* Created: Feb 22, 2007
* Author: Rodolfo Giometti <giometti@linux.it>
*
* Based on a previous implementations by Kevin O'Connor
* <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
* on some suggestions by Nicolas Pitre <nico@cam.org>.
*
* 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.
*/
#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 <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/irqs.h>
#include <asm/arch/pxa27x_keyboard.h>
#define DRIVER_NAME "pxa27x-keyboard"
#define KPASMKP(col) (col/2 == 0 ? KPASMKP0 : \
col/2 == 1 ? KPASMKP1 : \
col/2 == 2 ? KPASMKP2 : KPASMKP3)
#define KPASMKPx_MKC(row, col) (1 << (row + 16 * (col % 2)))
static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input_dev = platform_get_drvdata(pdev);
unsigned long kpc = KPC;
int p, row, col, rel;
if (kpc & KPC_DI) {
unsigned long kpdk = KPDK;
if (!(kpdk & KPDK_DKP)) {
/* better luck next time */
} else if (kpc & KPC_REE0) {
unsigned long kprec = KPREC;
KPREC = 0x7f;
if (kprec & KPREC_OF0)
rel = (kprec & 0xff) + 0x7f;
else if (kprec & KPREC_UF0)
rel = (kprec & 0xff) - 0x7f - 0xff;
else
rel = (kprec & 0xff) - 0x7f;
if (rel) {
input_report_rel(input_dev, REL_WHEEL, rel);
input_sync(input_dev);
}
}
}
if (kpc & KPC_MI) {
/* report the status of every button */
for (row = 0; row < pdata->nr_rows; row++) {
for (col = 0; col < pdata->nr_cols; col++) {
p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
1 : 0;
pr_debug("keycode %x - pressed %x\n",
pdata->keycodes[row][col], p);
input_report_key(input_dev,
pdata->keycodes[row][col], p);
}
}
input_sync(input_dev);
}
return IRQ_HANDLED;
}
static int pxakbd_open(struct input_dev *dev)
{
/* Set keypad control register */
KPC |= (KPC_ASACT |
KPC_MS_ALL |
(2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
KPC &= ~KPC_AS; /* disable automatic scan */
KPC &= ~KPC_IMKP; /* do not ignore multiple keypresses */
/* Set rotary count to mid-point value */
KPREC = 0x7F;
/* Enable unit clock */
pxa_set_cken(CKEN_KEYPAD, 1);
return 0;
}
static void pxakbd_close(struct input_dev *dev)
{
/* Disable clock unit */
pxa_set_cken(CKEN_KEYPAD, 0);
}
#ifdef CONFIG_PM
static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
{
struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
/* Save controller status */
pdata->reg_kpc = KPC;
pdata->reg_kprec = KPREC;
return 0;
}
static int pxakbd_resume(struct platform_device *pdev)
{
struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input_dev = platform_get_drvdata(pdev);
mutex_lock(&input_dev->mutex);
if (input_dev->users) {
/* Restore controller status */
KPC = pdata->reg_kpc;
KPREC = pdata->reg_kprec;
/* Enable unit clock */
pxa_set_cken(CKEN_KEYPAD, 1);
}
mutex_unlock(&input_dev->mutex);
return 0;
}
#else
#define pxakbd_suspend NULL
#define pxakbd_resume NULL
#endif
static int __devinit pxakbd_probe(struct platform_device *pdev)
{
struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input_dev;
int i, row, col, error;
/* Create and register the input driver. */
input_dev = input_allocate_device();
if (!input_dev) {
printk(KERN_ERR "Cannot request keypad device\n");
return -ENOMEM;
}
input_dev->name = DRIVER_NAME;
input_dev->id.bustype = BUS_HOST;
input_dev->open = pxakbd_open;
input_dev->close = pxakbd_close;
input_dev->dev.parent = &pdev->dev;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_REL);
input_dev->relbit[LONG(REL_WHEEL)] = BIT(REL_WHEEL);
for (row = 0; row < pdata->nr_rows; row++) {
for (col = 0; col < pdata->nr_cols; col++) {
int code = pdata->keycodes[row][col];
if (code > 0)
set_bit(code, input_dev->keybit);
}
}
error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED,
DRIVER_NAME, pdev);
if (error) {
printk(KERN_ERR "Cannot request keypad IRQ\n");
pxa_set_cken(CKEN_KEYPAD, 0);
goto err_free_dev;
}
platform_set_drvdata(pdev, input_dev);
/* Register the input device */
error = input_register_device(input_dev);
if (error)
goto err_free_irq;
/* Setup GPIOs. */
for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
pxa_gpio_mode(pdata->gpio_modes[i]);
/*
* Store rows/cols info into keyboard registers.
*/
KPC |= (pdata->nr_rows - 1) << 26;
KPC |= (pdata->nr_cols - 1) << 23;
for (col = 0; col < pdata->nr_cols; col++)
KPC |= KPC_MS0 << col;
return 0;
err_free_irq:
platform_set_drvdata(pdev, NULL);
free_irq(IRQ_KEYPAD, pdev);
err_free_dev:
input_free_device(input_dev);
return error;
}
static int __devexit pxakbd_remove(struct platform_device *pdev)
{
struct input_dev *input_dev = platform_get_drvdata(pdev);
input_unregister_device(input_dev);
free_irq(IRQ_KEYPAD, pdev);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver pxakbd_driver = {
.probe = pxakbd_probe,
.remove = __devexit_p(pxakbd_remove),
.suspend = pxakbd_suspend,
.resume = pxakbd_resume,
.driver = {
.name = DRIVER_NAME,
},
};
static int __init pxakbd_init(void)
{
return platform_driver_register(&pxakbd_driver);
}
static void __exit pxakbd_exit(void)
{
platform_driver_unregister(&pxakbd_driver);
}
module_init(pxakbd_init);
module_exit(pxakbd_exit);
MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
MODULE_LICENSE("GPL");
