Orange Pi5 kernel

/*
 * 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 input_dev *idev;
<------>int error;
 
<------>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 = input_register_device(idev);
<------>if (error) {
<------><------>dev_err(&pdev->dev, "Can't register input device: %d\n",
<------><------><------>error);
<------><------>return error;
<------>}
 
<------>return 0;
}
 
#ifdef CONFIG_ACPI
static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
<------><------><------><------><------>     struct platform_device *pdev)
{
<------>unsigned long long hrv = 0;
<------>acpi_status status;
 
<------>if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
<------>    axp20x_pek->axp20x->variant == AXP288_ID) {
<------><------>status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent),
<------><------><------><------><------>       "_HRV", NULL, &hrv);
<------><------>if (ACPI_FAILURE(status))
<------><------><------>dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n");
 
<------><------>/*
<------><------> * On Cherry Trail platforms (hrv == 3), do not register the
<------><------> * input device if there is an "INTCFD9" or "ACPI0011" gpio
<------><------> * button ACPI device, as that handles the power button too,
<------><------> * and otherwise we end up reporting all presses twice.
<------><------> */
<------><------>if (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) ||
<------><------><------><------> acpi_dev_present("ACPI0011", NULL, -1)))
<------><------><------>return false;
 
<------>}
 
<------>return true;
}
#else
static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
<------><------><------><------><------>     struct platform_device *pdev)
{
<------>return true;
}
#endif
 
static int axp20x_pek_probe(struct platform_device *pdev)
{
<------>struct axp20x_pek *axp20x_pek;
<------>const struct platform_device_id *match = platform_get_device_id(pdev);
<------>int error;
 
<------>if (!match) {
<------><------>dev_err(&pdev->dev, "Failed to get platform_device_id\n");
<------><------>return -EINVAL;
<------>}
 
<------>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);
 
<------>axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
<------>if (axp20x_pek->irq_dbr < 0)
<------><------>return axp20x_pek->irq_dbr;
<------>axp20x_pek->irq_dbr = regmap_irq_get_virq(
<------><------><------>axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbr);
 
<------>axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
<------>if (axp20x_pek->irq_dbf < 0)
<------><------>return axp20x_pek->irq_dbf;
<------>axp20x_pek->irq_dbf = regmap_irq_get_virq(
<------><------><------>axp20x_pek->axp20x->regmap_irqc, axp20x_pek->irq_dbf);
 
<------>if (axp20x_pek_should_register_input(axp20x_pek, pdev)) {
<------><------>error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
<------><------>if (error)
<------><------><------>return error;
<------>}
 
<------>axp20x_pek->info = (struct axp20x_info *)match->driver_data;
 
<------>error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
<------><------><------><------><------>     axp20x_pek_irq, 0,
<------><------><------><------><------>     "axp20x-pek-dbr", axp20x_pek);
<------>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", axp20x_pek);
<------>if (error < 0) {
<------><------>dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
<------><------><------>axp20x_pek->irq_dbf, error);
<------><------>return error;
<------>}
 
<------>device_init_wakeup(&pdev->dev, true);
 
<------>platform_set_drvdata(pdev, axp20x_pek);
 
<------>return 0;
}
 
static int __maybe_unused axp20x_pek_suspend(struct device *dev)
{
<------>struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 
<------>/*
<------> * As nested threaded IRQs are not automatically disabled during
<------> * suspend, we must explicitly disable non-wakeup IRQs.
<------> */
<------>if (device_may_wakeup(dev)) {
<------><------>enable_irq_wake(axp20x_pek->irq_dbf);
<------><------>enable_irq_wake(axp20x_pek->irq_dbr);
<------>} else {
<------><------>disable_irq(axp20x_pek->irq_dbf);
<------><------>disable_irq(axp20x_pek->irq_dbr);
<------>}
 
<------>return 0;
}
 
static int __maybe_unused axp20x_pek_resume(struct device *dev)
{
<------>struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 
<------>if (device_may_wakeup(dev)) {
<------><------>disable_irq_wake(axp20x_pek->irq_dbf);
<------><------>disable_irq_wake(axp20x_pek->irq_dbr);
<------>} else {
<------><------>enable_irq(axp20x_pek->irq_dbf);
<------><------>enable_irq(axp20x_pek->irq_dbr);
<------>}
 
<------>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 = {
<------>SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
#ifdef CONFIG_PM_SLEEP
<------>.resume_noirq = axp20x_pek_resume_noirq,
#endif
};
 
static const struct platform_device_id axp_pek_id_match[] = {
<------>{
<------><------>.name = "axp20x-pek",
<------><------>.driver_data = (kernel_ulong_t)&axp20x_info,
<------>},
<------>{
<------><------>.name = "axp221-pek",
<------><------>.driver_data = (kernel_ulong_t)&axp221_info,
<------>},
<------>{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, axp_pek_id_match);
 
static struct platform_driver axp20x_pek_driver = {
<------>.probe		= axp20x_pek_probe,
<------>.id_table	= axp_pek_id_match,
<------>.driver		= {
<------><------>.name		= "axp20x-pek",
<------><------>.pm		= &axp20x_pek_pm_ops,
<------><------>.dev_groups	= axp20x_groups,
<------>},
};
module_platform_driver(axp20x_pek_driver);
 
MODULE_DESCRIPTION("axp20x Power Button");
MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
MODULE_LICENSE("GPL");