marvell/linux/drivers/input/misc/pm80x_exton2.c

/*
 * ASRMICRO PM80x EXTON2 driver
 *
 * Copyright: (C) Copyright 2024 ASR Microelectronics (Shanghai) Co., Ltd.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/mfd/88pm80x.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/irq.h>

struct pm80x_exton2_info {
	struct input_dev *idev;
	struct device *dev;
	struct pm80x_chip *pm80x;
	struct regmap *map;
	int irq;
};

/* 88PM80x gives us an interrupt when EXTON2 is held */
static irqreturn_t pm80x_exton2_handler(int irq, void *data)
{
	struct pm80x_exton2_info *info = data;
	int ret = 0;
	unsigned int val;

	ret = regmap_read(info->map, PM800_STATUS_1, &val);
	if (ret < 0) {
		dev_err(info->idev->dev.parent,
			"failed to read status: %d\n", ret);
		return IRQ_NONE;
	}
	val &= PM800_CHG_STS1;
	if (val) {
		pm_stay_awake(info->dev);
	} else {
		pm_wakeup_event(info->dev, 8000);
	}

	pr_info("pm80x_exton2 press = %x\n", !!val); /* sys-sanity */

	input_report_key(info->idev, KEY_POWER, val);
	input_sync(info->idev);

	return IRQ_HANDLED;
}

static SIMPLE_DEV_PM_OPS(pm80x_exton2_pm_ops, pm80x_dev_suspend,
			 pm80x_dev_resume);

static int pm80x_exton2_dt_init(struct device_node *np,
			       struct pm80x_exton2_info *info)
{
	return 0;
}

static int pm80x_exton2_probe(struct platform_device *pdev)
{
	struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct device_node *node = pdev->dev.of_node;
	struct pm80x_exton2_info *info;
	int err;

	if (CHIP_PM803 == chip->type || CHIP_PM801 == chip->type)
		return -ENODEV;

	info = kzalloc(sizeof(struct pm80x_exton2_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->pm80x = chip;

	info->irq = platform_get_irq(pdev, 0);
	if (info->irq < 0) {
		dev_err(&pdev->dev, "No IRQ resource!\n");
		err = -EINVAL;
		goto out;
	}

	info->map = info->pm80x->regmap;
	if (!info->map) {
		dev_err(&pdev->dev, "no regmap!\n");
		err = -EINVAL;
		goto out;
	}

	info->idev = input_allocate_device();
	if (!info->idev) {
		dev_err(&pdev->dev, "Failed to allocate input dev\n");
		err = -ENOMEM;
		goto out;
	}

	info->dev = &pdev->dev;
	info->idev->name = "88pm80x_exton2";
	info->idev->phys = "88pm80x_exton2/input0";
	info->idev->id.bustype = BUS_I2C;
	info->idev->dev.parent = &pdev->dev;
	info->idev->evbit[0] = BIT_MASK(EV_KEY);
	__set_bit(KEY_POWER, info->idev->keybit);

	err = pm80x_exton2_dt_init(node, info);
	if (err < 0) {
		err = -ENODEV;
		goto out_reg;
	}

	irq_set_status_flags(info->irq, IRQ_NOAUTOEN);
	err = pm80x_request_irq(info->pm80x, info->irq, pm80x_exton2_handler,
					    IRQF_ONESHOT | IRQF_NO_SUSPEND,
					    "exton2", info);
	if (err < 0) {
		dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
			info->irq, err);
		goto out_reg;
	}

	err = input_register_device(info->idev);
	if (err) {
		dev_err(&pdev->dev, "Can't register input device: %d\n", err);
		goto out_irq;
	}

	if (CHIP_PM813S_A0_ID == chip->chip_id ||
			CHIP_PM813S_A1_ID == chip->chip_id)
		regmap_update_bits(info->map, PM800_RTC_MISC4, 0xf0, 0x70);
	else
		regmap_update_bits(info->map, PM800_RTC_MISC4, 0xf0, 0xf0);

	platform_set_drvdata(pdev, info);

	/* set FAULT_WU_EN */
	if (CHIP_PM803 == chip->type ||
		CHIP_PM813 == chip->type)
		regmap_update_bits(chip->regmap, PM800_RTC_MISC5, PM803_FAULT_WAKEUP_EN,
			   PM803_FAULT_WAKEUP_EN);
	else
		regmap_update_bits(chip->regmap, PM800_RTC_MISC5, PM800_FAULT_WAKEUP_EN,
			   PM800_FAULT_WAKEUP_EN);

	/* need to set fault_wakeup for asr new pmics */
	if (CHIP_PM802 == chip->type ||
		CHIP_PM813_ID == chip->chip_id)
		regmap_update_bits(chip->regmap, PM800_RTC_MISC5, PM800_FAULT_WAKEUP,
			   PM800_FAULT_WAKEUP);
	else if (CHIP_PM803 == chip->type ||
		CHIP_PM813S_A0_ID == chip->chip_id ||
		CHIP_PM813S_A1_ID == chip->chip_id)
		regmap_update_bits(chip->regmap, PM800_RTC_MISC5, PM803_FAULT_WAKEUP,
			   PM803_FAULT_WAKEUP);

	/* OnKey runs timer => need wake-constraint {Press ... Release+mSec}
	 * (especially  to avoid false-panic-emulation).
	 * device_init_wakeup() creates "88pm80x-ext2key"
	 * but pm_stay_awake(&info->idev->dev) doesn't as required
	 * Do NOT use the driver's name but the "exton2" instead.
	 */
	device_init_wakeup(info->dev, true);
	enable_irq(info->irq);
	return 0;

out_irq:
	pm80x_free_irq(info->pm80x, info->irq, info);
out_reg:
	input_free_device(info->idev);
out:
	kfree(info);
	return err;
}

static int pm80x_exton2_remove(struct platform_device *pdev)
{
	struct pm80x_exton2_info *info = platform_get_drvdata(pdev);

	disable_irq(info->irq);
	pm80x_free_irq(info->pm80x, info->irq, info);
	input_unregister_device(info->idev);
	kfree(info);
	return 0;
}

static void pm80x_exton2_shutdown(struct platform_device *pdev)
{
	struct pm80x_exton2_info *info = platform_get_drvdata(pdev);
	disable_irq(info->irq);
	pm80x_free_irq(info->pm80x, info->irq, info);
	return;
}

static const struct of_device_id pm80x_exton2_dt_match[] = {
	{ .compatible = "88pm80x-ext2key", },
	{ },
};
MODULE_DEVICE_TABLE(of, pm80x_exton2_dt_match);

static struct platform_driver pm80x_exton2_driver = {
	.driver = {
		   .name = "88pm80x-ext2key",
		   .owner = THIS_MODULE,
		   .pm = &pm80x_exton2_pm_ops,
		   .of_match_table = of_match_ptr(pm80x_exton2_dt_match),
		   },
	.probe = pm80x_exton2_probe,
	.remove = pm80x_exton2_remove,
	.shutdown = pm80x_exton2_shutdown,
};

module_platform_driver(pm80x_exton2_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ASRMICRO PM80x EXTON2 driver");
MODULE_AUTHOR("Xuhong Gao <xuhonggao@asrmicro.com>");
MODULE_ALIAS("platform:pm80x-exton2");