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/*
* 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/clk.h>
#include <linux/io.h>
#include <asm/sh_keysc.h>
#define KYCR1_OFFS 0x00
#define KYCR2_OFFS 0x04
#define KYINDR_OFFS 0x08
#define KYOUTDR_OFFS 0x0c
#define KYCR2_IRQ_LEVEL 0x10
#define KYCR2_IRQ_DISABLED 0x00
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 },
};
struct sh_keysc_priv {
void __iomem *iomem_base;
struct clk *clk;
unsigned long last_keys;
struct input_dev *input;
struct sh_keysc_info pdata;
};
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;
unsigned long keys, keys1, keys0, mask;
unsigned char keyin_set, tmp;
int i, k;
dev_dbg(&pdev->dev, "isr!\n");
keys1 = ~0;
keys0 = 0;
do {
keys = 0;
keyin_set = 0;
iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);
for (i = 0; i < sh_keysc_mode[pdata->mode].keyout; i++) {
iowrite16(0xfff ^ (3 << (i * 2)),
priv->iomem_base + KYOUTDR_OFFS);
udelay(pdata->delay);
tmp = ioread16(priv->iomem_base + KYINDR_OFFS);
keys |= tmp << (sh_keysc_mode[pdata->mode].keyin * i);
tmp ^= (1 << sh_keysc_mode[pdata->mode].keyin) - 1;
keyin_set |= tmp;
}
iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8),
priv->iomem_base + KYCR2_OFFS);
keys ^= ~0;
keys &= (1 << (sh_keysc_mode[pdata->mode].keyin *
sh_keysc_mode[pdata->mode].keyout)) - 1;
keys1 &= keys;
keys0 |= keys;
dev_dbg(&pdev->dev, "keys 0x%08lx\n", keys);
} while (ioread16(priv->iomem_base + KYCR2_OFFS) & 0x01);
dev_dbg(&pdev->dev, "last_keys 0x%08lx keys0 0x%08lx keys1 0x%08lx\n",
priv->last_keys, keys0, keys1);
for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
k = pdata->keycodes[i];
if (!k)
continue;
mask = 1 << i;
if (!((priv->last_keys ^ keys0) & mask))
continue;
if ((keys1 | keys0) & mask) {
input_event(priv->input, EV_KEY, k, 1);
priv->last_keys |= mask;
}
if (!(keys1 & mask)) {
input_event(priv->input, EV_KEY, k, 0);
priv->last_keys &= ~mask;
}
}
input_sync(priv->input);
return IRQ_HANDLED;
}
#define res_size(res) ((res)->end - (res)->start + 1)
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, k;
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, res_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;
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++) {
k = pdata->keycodes[i];
if (k)
input_set_capability(input, EV_KEY, k);
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev, "failed to register input device\n");
goto err5;
}
clk_enable(priv->clk);
iowrite16((sh_keysc_mode[pdata->mode].kymd << 8) |
pdata->scan_timing, priv->iomem_base + KYCR1_OFFS);
iowrite16(0, priv->iomem_base + KYOUTDR_OFFS);
iowrite16(KYCR2_IRQ_LEVEL, priv->iomem_base + KYCR2_OFFS);
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);
iowrite16(KYCR2_IRQ_DISABLED, priv->iomem_base + KYCR2_OFFS);
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);
unsigned short value;
value = ioread16(priv->iomem_base + KYCR1_OFFS);
if (device_may_wakeup(dev))
value |= 0x80;
else
value &= ~0x80;
iowrite16(value, priv->iomem_base + KYCR1_OFFS);
return 0;
}
static struct dev_pm_ops sh_keysc_dev_pm_ops = {
.suspend = sh_keysc_suspend,
};
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");
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