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/*
* axp20x power button driver.
*
* Copyright (C) 2013 Carlo Caione <carlo@caione.org>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/acpi.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/axp20x.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define AXP20X_PEK_STARTUP_MASK (0xc0)
#define AXP20X_PEK_SHUTDOWN_MASK (0x03)
struct axp20x_info {
const struct axp20x_time *startup_time;
unsigned int startup_mask;
const struct axp20x_time *shutdown_time;
unsigned int shutdown_mask;
};
struct axp20x_pek {
struct axp20x_dev *axp20x;
struct input_dev *input;
struct axp20x_info *info;
int irq_dbr;
int irq_dbf;
};
struct axp20x_time {
unsigned int time;
unsigned int idx;
};
static const struct axp20x_time startup_time[] = {
{ .time = 128, .idx = 0 },
{ .time = 1000, .idx = 2 },
{ .time = 3000, .idx = 1 },
{ .time = 2000, .idx = 3 },
};
static const struct axp20x_time axp221_startup_time[] = {
{ .time = 128, .idx = 0 },
{ .time = 1000, .idx = 1 },
{ .time = 2000, .idx = 2 },
{ .time = 3000, .idx = 3 },
};
static const struct axp20x_time shutdown_time[] = {
{ .time = 4000, .idx = 0 },
{ .time = 6000, .idx = 1 },
{ .time = 8000, .idx = 2 },
{ .time = 10000, .idx = 3 },
};
static const struct axp20x_info axp20x_info = {
.startup_time = startup_time,
.startup_mask = AXP20X_PEK_STARTUP_MASK,
.shutdown_time = shutdown_time,
.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
};
static const struct axp20x_info axp221_info = {
.startup_time = axp221_startup_time,
.startup_mask = AXP20X_PEK_STARTUP_MASK,
.shutdown_time = shutdown_time,
.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
};
static ssize_t axp20x_show_attr(struct device *dev,
const struct axp20x_time *time,
unsigned int mask, char *buf)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
unsigned int val;
int ret, i;
ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
if (ret != 0)
return ret;
val &= mask;
val >>= ffs(mask) - 1;
for (i = 0; i < 4; i++)
if (val == time[i].idx)
val = time[i].time;
return sprintf(buf, "%u\n", val);
}
static ssize_t axp20x_show_attr_startup(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
return axp20x_show_attr(dev, axp20x_pek->info->startup_time,
axp20x_pek->info->startup_mask, buf);
}
static ssize_t axp20x_show_attr_shutdown(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time,
axp20x_pek->info->shutdown_mask, buf);
}
static ssize_t axp20x_store_attr(struct device *dev,
const struct axp20x_time *time,
unsigned int mask, const char *buf,
size_t count)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
char val_str[20];
size_t len;
int ret, i;
unsigned int val, idx = 0;
unsigned int best_err = UINT_MAX;
val_str[sizeof(val_str) - 1] = '\0';
strncpy(val_str, buf, sizeof(val_str) - 1);
len = strlen(val_str);
if (len && val_str[len - 1] == '\n')
val_str[len - 1] = '\0';
ret = kstrtouint(val_str, 10, &val);
if (ret)
return ret;
for (i = 3; i >= 0; i--) {
unsigned int err;
err = abs(time[i].time - val);
if (err < best_err) {
best_err = err;
idx = time[i].idx;
}
if (!err)
break;
}
idx <<= ffs(mask) - 1;
ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
mask, idx);
if (ret != 0)
return -EINVAL;
return count;
}
static ssize_t axp20x_store_attr_startup(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
axp20x_pek->info->startup_mask, buf, count);
}
static ssize_t axp20x_store_attr_shutdown(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
axp20x_pek->info->shutdown_mask, buf, count);
}
static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
axp20x_store_attr_startup);
static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
axp20x_store_attr_shutdown);
static struct attribute *axp20x_attrs[] = {
&dev_attr_startup.attr,
&dev_attr_shutdown.attr,
NULL,
};
ATTRIBUTE_GROUPS(axp20x);
static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
{
struct axp20x_pek *axp20x_pek = pwr;
struct input_dev *idev = axp20x_pek->input;
if (!idev)
return IRQ_HANDLED;
/*
* The power-button is connected to ground so a falling edge (dbf)
* means it is pressed.
*/
if (irq == axp20x_pek->irq_dbf)
input_report_key(idev, KEY_POWER, true);
else if (irq == axp20x_pek->irq_dbr)
input_report_key(idev, KEY_POWER, false);
input_sync(idev);
return IRQ_HANDLED;
}
static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
struct platform_device *pdev)
{
struct
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