/*
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* drivers/input/sensors/hall/mh248.c
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*
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* Copyright (C) 2012-2016 Rockchip Co.,Ltd.
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* Author: Bin Yang <yangbin@rock-chips.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/miscdevice.h>
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#include <linux/gpio.h>
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#include <linux/uaccess.h>
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#include <linux/atomic.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/freezer.h>
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#include <linux/of_gpio.h>
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#include <linux/sensor-dev.h>
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#include <linux/fb.h>
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#include <linux/notifier.h>
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#include <linux/rk_keys.h>
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struct mh248_para {
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struct device *dev;
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struct notifier_block fb_notif;
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struct mutex ops_lock;
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int is_suspend;
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int gpio_pin;
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int irq;
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int active_value;
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};
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static int hall_fb_notifier_callback(struct notifier_block *self,
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unsigned long action, void *data)
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{
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struct mh248_para *mh248;
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struct fb_event *event = data;
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mh248 = container_of(self, struct mh248_para, fb_notif);
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mutex_lock(&mh248->ops_lock);
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if (action == FB_EARLY_EVENT_BLANK) {
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switch (*((int *)event->data)) {
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case FB_BLANK_UNBLANK:
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break;
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default:
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mh248->is_suspend = 1;
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break;
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}
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} else if (action == FB_EVENT_BLANK) {
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switch (*((int *)event->data)) {
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case FB_BLANK_UNBLANK:
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mh248->is_suspend = 0;
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break;
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default:
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break;
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}
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}
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mutex_unlock(&mh248->ops_lock);
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return NOTIFY_OK;
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}
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static irqreturn_t hall_mh248_interrupt(int irq, void *dev_id)
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{
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struct mh248_para *mh248 = (struct mh248_para *)dev_id;
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int gpio_value = 0;
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gpio_value = gpio_get_value(mh248->gpio_pin);
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if ((gpio_value != mh248->active_value) &&
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(mh248->is_suspend == 0)) {
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rk_send_power_key(1);
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rk_send_power_key(0);
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} else if ((gpio_value == mh248->active_value) &&
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(mh248->is_suspend == 1)) {
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rk_send_wakeup_key();
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}
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return IRQ_HANDLED;
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}
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static int hall_mh248_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct mh248_para *mh248;
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enum of_gpio_flags irq_flags;
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int hallactive = 0;
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int gpio_value = 0;
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int ret = 0;
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mh248 = devm_kzalloc(&pdev->dev, sizeof(*mh248), GFP_KERNEL);
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if (!mh248)
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return -ENOMEM;
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mh248->dev = &pdev->dev;
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mh248->gpio_pin = of_get_named_gpio_flags(np, "irq-gpio",
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0, &irq_flags);
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if (!gpio_is_valid(mh248->gpio_pin)) {
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dev_err(mh248->dev, "Can not read property irq-gpio\n");
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return mh248->gpio_pin;
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}
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mh248->irq = gpio_to_irq(mh248->gpio_pin);
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of_property_read_u32(np, "hall-active", &hallactive);
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mh248->active_value = hallactive;
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mh248->is_suspend = 0;
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mutex_init(&mh248->ops_lock);
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ret = devm_gpio_request_one(mh248->dev, mh248->gpio_pin,
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GPIOF_DIR_IN, "hall_mh248");
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if (ret < 0) {
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dev_err(mh248->dev, "fail to request gpio:%d\n",
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mh248->gpio_pin);
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return ret;
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}
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gpio_value = gpio_get_value(mh248->gpio_pin);
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ret = devm_request_threaded_irq(mh248->dev, mh248->irq,
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NULL, hall_mh248_interrupt,
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irq_flags | IRQF_NO_SUSPEND | IRQF_ONESHOT,
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"hall_mh248", mh248);
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if (ret < 0) {
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dev_err(mh248->dev, "request irq(%d) failed, ret=%d\n",
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mh248->irq, ret);
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return ret;
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}
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enable_irq_wake(mh248->irq);
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mh248->fb_notif.notifier_call = hall_fb_notifier_callback;
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fb_register_client(&mh248->fb_notif);
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dev_info(mh248->dev, "hall_mh248_probe success.\n");
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return 0;
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}
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static const struct of_device_id hall_mh248_match[] = {
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{ .compatible = "hall-mh248" },
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{ /* Sentinel */ }
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};
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static struct platform_driver hall_mh248_driver = {
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.probe = hall_mh248_probe,
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.driver = {
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.name = "mh248",
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.owner = THIS_MODULE,
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.of_match_table = hall_mh248_match,
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},
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};
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module_platform_driver(hall_mh248_driver);
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MODULE_ALIAS("platform:mh248");
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MODULE_AUTHOR("Bin Yang <yangbin@rock-chips.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Hall Sensor MH248 driver");
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