linux/drivers/input/keyboard/sh_keysc.c

366 lines
8.4 KiB
C

/*
* SuperH KEYSC Keypad Driver
*
* Copyright (C) 2008 Magnus Damm
*
* Based on gpio_keys.c, Copyright 2005 Phil Blundell
*
* 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/irq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/input/sh_keysc.h>
#include <linux/bitmap.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/slab.h>
static const struct {
unsigned char kymd, keyout, keyin;
} sh_keysc_mode[] = {
[SH_KEYSC_MODE_1] = { 0, 6, 5 },
[SH_KEYSC_MODE_2] = { 1, 5, 6 },
[SH_KEYSC_MODE_3] = { 2, 4, 7 },
[SH_KEYSC_MODE_4] = { 3, 6, 6 },
[SH_KEYSC_MODE_5] = { 4, 6, 7 },
[SH_KEYSC_MODE_6] = { 5, 7, 7 },
};
struct sh_keysc_priv {
void __iomem *iomem_base;
struct clk *clk;
DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS);
struct input_dev *input;
struct sh_keysc_info pdata;
};
#define KYCR1 0
#define KYCR2 1
#define KYINDR 2
#define KYOUTDR 3
#define KYCR2_IRQ_LEVEL 0x10
#define KYCR2_IRQ_DISABLED 0x00
static unsigned long sh_keysc_read(struct sh_keysc_priv *p, int reg_nr)
{
return ioread16(p->iomem_base + (reg_nr << 2));
}
static void sh_keysc_write(struct sh_keysc_priv *p, int reg_nr,
unsigned long value)
{
iowrite16(value, p->iomem_base + (reg_nr << 2));
}
static void sh_keysc_level_mode(struct sh_keysc_priv *p,
unsigned long keys_set)
{
struct sh_keysc_info *pdata = &p->pdata;
sh_keysc_write(p, KYOUTDR, 0);
sh_keysc_write(p, KYCR2, KYCR2_IRQ_LEVEL | (keys_set << 8));
if (pdata->kycr2_delay)
udelay(pdata->kycr2_delay);
}
static void sh_keysc_map_dbg(struct device *dev, unsigned long *map,
const char *str)
{
int k;
for (k = 0; k < BITS_TO_LONGS(SH_KEYSC_MAXKEYS); k++)
dev_dbg(dev, "%s[%d] 0x%lx\n", str, k, map[k]);
}
static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
struct sh_keysc_info *pdata = &priv->pdata;
int keyout_nr = sh_keysc_mode[pdata->mode].keyout;
int keyin_nr = sh_keysc_mode[pdata->mode].keyin;
DECLARE_BITMAP(keys, SH_KEYSC_MAXKEYS);
DECLARE_BITMAP(keys0, SH_KEYSC_MAXKEYS);
DECLARE_BITMAP(keys1, SH_KEYSC_MAXKEYS);
unsigned char keyin_set, tmp;
int i, k, n;
dev_dbg(&pdev->dev, "isr!\n");
bitmap_fill(keys1, SH_KEYSC_MAXKEYS);
bitmap_zero(keys0, SH_KEYSC_MAXKEYS);
do {
bitmap_zero(keys, SH_KEYSC_MAXKEYS);
keyin_set = 0;
sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
for (i = 0; i < keyout_nr; i++) {
n = keyin_nr * i;
/* drive one KEYOUT pin low, read KEYIN pins */
sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2)));
udelay(pdata->delay);
tmp = sh_keysc_read(priv, KYINDR);
/* set bit if key press has been detected */
for (k = 0; k < keyin_nr; k++) {
if (tmp & (1 << k))
__set_bit(n + k, keys);
}
/* keep track of which KEYIN bits that have been set */
keyin_set |= tmp ^ ((1 << keyin_nr) - 1);
}
sh_keysc_level_mode(priv, keyin_set);
bitmap_complement(keys, keys, SH_KEYSC_MAXKEYS);
bitmap_and(keys1, keys1, keys, SH_KEYSC_MAXKEYS);
bitmap_or(keys0, keys0, keys, SH_KEYSC_MAXKEYS);
sh_keysc_map_dbg(&pdev->dev, keys, "keys");
} while (sh_keysc_read(priv, KYCR2) & 0x01);
sh_keysc_map_dbg(&pdev->dev, priv->last_keys, "last_keys");
sh_keysc_map_dbg(&pdev->dev, keys0, "keys0");
sh_keysc_map_dbg(&pdev->dev, keys1, "keys1");
for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
k = pdata->keycodes[i];
if (!k)
continue;
if (test_bit(i, keys0) == test_bit(i, priv->last_keys))
continue;
if (test_bit(i, keys1) || test_bit(i, keys0)) {
input_event(priv->input, EV_KEY, k, 1);
__set_bit(i, priv->last_keys);
}
if (!test_bit(i, keys1)) {
input_event(priv->input, EV_KEY, k, 0);
__clear_bit(i, priv->last_keys);
}
}
input_sync(priv->input);
return IRQ_HANDLED;
}
static int __devinit sh_keysc_probe(struct platform_device *pdev)
{
struct sh_keysc_priv *priv;
struct sh_keysc_info *pdata;
struct resource *res;
struct input_dev *input;
char clk_name[8];
int i;
int irq, error;
if (!pdev->dev.platform_data) {
dev_err(&pdev->dev, "no platform data defined\n");
error = -EINVAL;
goto err0;
}
error = -ENXIO;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "failed to get I/O memory\n");
goto err0;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get irq\n");
goto err0;
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv == NULL) {
dev_err(&pdev->dev, "failed to allocate driver data\n");
error = -ENOMEM;
goto err0;
}
platform_set_drvdata(pdev, priv);
memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata));
pdata = &priv->pdata;
priv->iomem_base = ioremap_nocache(res->start, resource_size(res));
if (priv->iomem_base == NULL) {
dev_err(&pdev->dev, "failed to remap I/O memory\n");
error = -ENXIO;
goto err1;
}
snprintf(clk_name, sizeof(clk_name), "keysc%d", pdev->id);
priv->clk = clk_get(&pdev->dev, clk_name);
if (IS_ERR(priv->clk)) {
dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
error = PTR_ERR(priv->clk);
goto err2;
}
priv->input = input_allocate_device();
if (!priv->input) {
dev_err(&pdev->dev, "failed to allocate input device\n");
error = -ENOMEM;
goto err3;
}
input = priv->input;
input->evbit[0] = BIT_MASK(EV_KEY);
input->name = pdev->name;
input->phys = "sh-keysc-keys/input0";
input->dev.parent = &pdev->dev;
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
input->keycode = pdata->keycodes;
input->keycodesize = sizeof(pdata->keycodes[0]);
input->keycodemax = ARRAY_SIZE(pdata->keycodes);
error = request_irq(irq, sh_keysc_isr, 0, pdev->name, pdev);
if (error) {
dev_err(&pdev->dev, "failed to request IRQ\n");
goto err4;
}
for (i = 0; i < SH_KEYSC_MAXKEYS; i++)
__set_bit(pdata->keycodes[i], input->keybit);
__clear_bit(KEY_RESERVED, input->keybit);
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev, "failed to register input device\n");
goto err5;
}
clk_enable(priv->clk);
sh_keysc_write(priv, KYCR1, (sh_keysc_mode[pdata->mode].kymd << 8) |
pdata->scan_timing);
sh_keysc_level_mode(priv, 0);
device_init_wakeup(&pdev->dev, 1);
return 0;
err5:
free_irq(irq, pdev);
err4:
input_free_device(input);
err3:
clk_put(priv->clk);
err2:
iounmap(priv->iomem_base);
err1:
platform_set_drvdata(pdev, NULL);
kfree(priv);
err0:
return error;
}
static int __devexit sh_keysc_remove(struct platform_device *pdev)
{
struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
input_unregister_device(priv->input);
free_irq(platform_get_irq(pdev, 0), pdev);
iounmap(priv->iomem_base);
clk_disable(priv->clk);
clk_put(priv->clk);
platform_set_drvdata(pdev, NULL);
kfree(priv);
return 0;
}
static int sh_keysc_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
int irq = platform_get_irq(pdev, 0);
unsigned short value;
value = sh_keysc_read(priv, KYCR1);
if (device_may_wakeup(dev)) {
value |= 0x80;
enable_irq_wake(irq);
} else {
value &= ~0x80;
}
sh_keysc_write(priv, KYCR1, value);
return 0;
}
static int sh_keysc_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
int irq = platform_get_irq(pdev, 0);
if (device_may_wakeup(dev))
disable_irq_wake(irq);
return 0;
}
static const struct dev_pm_ops sh_keysc_dev_pm_ops = {
.suspend = sh_keysc_suspend,
.resume = sh_keysc_resume,
};
struct platform_driver sh_keysc_device_driver = {
.probe = sh_keysc_probe,
.remove = __devexit_p(sh_keysc_remove),
.driver = {
.name = "sh_keysc",
.pm = &sh_keysc_dev_pm_ops,
}
};
static int __init sh_keysc_init(void)
{
return platform_driver_register(&sh_keysc_device_driver);
}
static void __exit sh_keysc_exit(void)
{
platform_driver_unregister(&sh_keysc_device_driver);
}
module_init(sh_keysc_init);
module_exit(sh_keysc_exit);
MODULE_AUTHOR("Magnus Damm");
MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
MODULE_LICENSE("GPL");