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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_pek {
struct axp20x_dev *axp20x;
struct input_dev *input;
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 shutdown_time[] = {
{ .time = 4000, .idx = 0 },
{ .time = 6000, .idx = 1 },
{ .time = 8000, .idx = 2 },
{ .time = 10000, .idx = 3 },
};
struct axp20x_pek_ext_attr {
const struct axp20x_time *p_time;
unsigned int mask;
};
static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
.p_time = startup_time,
.mask = AXP20X_PEK_STARTUP_MASK,
};
static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
.p_time = shutdown_time,
.mask = AXP20X_PEK_SHUTDOWN_MASK,
};
static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr)
{
return container_of(attr, struct dev_ext_attribute, attr)->var;
}
static ssize_t axp20x_show_ext_attr(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
unsigned int val;
int ret, i;
ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
if (ret != 0)
return ret;
val &= axp20x_ea->mask;
val >>= ffs(axp20x_ea->mask) - 1;
for (i = 0; i < 4; i++)
if (val == axp20x_ea->p_time[i].idx)
val = axp20x_ea->p_time[i].time;
return sprintf(buf, "%u\n", val);
}
static ssize_t axp20x_store_ext_attr(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
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(axp20x_ea->p_time[i].time - val);
if (err < best_err) {
best_err = err;
idx = axp20x_ea->p_time[i].idx;
}
if (!err)
break;
}
idx <<= ffs(axp20x_ea->mask) - 1;
ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
AXP20X_PEK_KEY,
axp20x_ea->mask, idx);
if (ret != 0)
return -EINVAL;
return count;
}
static struct dev_ext_attribute axp20x_dev_attr_startup = {
.attr = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
.var = &axp20x_pek_startup_ext_attr,
};
static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
.attr = __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
.var = &axp20x_pek_shutdown_ext_attr,
};
static struct attribute *axp20x_attributes[] = {
&axp20x_dev_attr_startup.attr.attr,
&axp20x_dev_attr_shutdown.attr.attr,
NULL,
};
static const struct attribute_group axp20x_attribute_group = {
.attrs = axp20x_attributes,
};
static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
{
struct input_dev *idev = pwr;
struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);
/*
* 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 void axp20x_remove_sysfs_group(void *_data)
{
struct device *dev = _data;
sysfs_remove_group(&dev->kobj, &axp20x_attribute_group);
}
static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
struct platform_device *pdev)
{
struct axp20x_dev *axp20x = axp20x_pek->axp20x;
struct input_dev *idev;
int error;
axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
if (axp20x_pek->irq_dbr < 0) {
dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
axp20x_pek->irq_dbr);
return axp20x_pek->irq_dbr;
}
axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
axp20x_pek->irq_dbr);
axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
if (axp20x_pek->irq_dbf < 0) {
dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
axp20x_pek->irq_dbf);
return axp20x_pek->irq_dbf;
}
axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
axp20x_pek->irq_dbf);
axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
if (!axp20x_pek->input)
return -ENOMEM;
idev = axp20x_pek->input;
idev->name = "axp20x-pek";
idev->phys = "m1kbd/input2";
idev->dev.parent = &pdev->dev;
input_set_capability(idev, EV_KEY, KEY_POWER);
input_set_drvdata(idev, axp20x_pek);
error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
axp20x_pek_irq, 0,
"axp20x-pek-dbr", idev);
if (error < 0) {
dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
axp20x_pek->irq_dbr, error);
return error;
}
error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
axp20x_pek_irq, 0,
"axp20x-pek-dbf", idev);
if (error < 0) {
dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
axp20x_pek->irq_dbf, error);
return error;
}
error = input_register_device(idev);
if (error) {
dev_err(&pdev->dev, "Can't register input device: %d\n",
error);
return error;
}
if (axp20x_pek->axp20x->variant == AXP288_ID)
enable_irq_wake(axp20x_pek->irq_dbr);
return 0;
}
static int axp20x_pek_probe(struct platform_device *pdev)
{
struct axp20x_pek *axp20x_pek;
int error;
axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
GFP_KERNEL);
if (!axp20x_pek)
return -ENOMEM;
axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);
/*
* Do not register the input device if there is an "INTCFD9"
* gpio button ACPI device, that handles the power button too,
* and otherwise we end up reporting all presses twice.
*/
if (!acpi_dev_found("INTCFD9") ||
!IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY)) {
error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
if (error)
return error;
}
error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group);
if (error) {
dev_err(&pdev->dev, "Failed to create sysfs attributes: %d\n",
error);
return error;
}
error = devm_add_action(&pdev->dev,
axp20x_remove_sysfs_group, &pdev->dev);
if (error) {
axp20x_remove_sysfs_group(&pdev->dev);
dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n",
error);
return error;
}
platform_set_drvdata(pdev, axp20x_pek);
return 0;
}
static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
{
struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
if (axp20x_pek->axp20x->variant != AXP288_ID)
return 0;
/*
* Clear interrupts from button presses during suspend, to avoid
* a wakeup power-button press getting reported to userspace.
*/
regmap_write(axp20x_pek->axp20x->regmap,
AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
BIT(AXP288_IRQ_POKN % 8));
return 0;
}
static const struct dev_pm_ops axp20x_pek_pm_ops = {
#ifdef CONFIG_PM_SLEEP
.resume_noirq = axp20x_pek_resume_noirq,
#endif
};
static struct platform_driver axp20x_pek_driver = {
.probe = axp20x_pek_probe,
.driver = {
.name = "axp20x-pek",
.pm = &axp20x_pek_pm_ops,
},
};
module_platform_driver(axp20x_pek_driver);
MODULE_DESCRIPTION("axp20x Power Button");
MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:axp20x-pek");
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