475 lines
11 KiB
C
Executable File
475 lines
11 KiB
C
Executable File
#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/sched.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/proc_fs.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/gpio.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/of.h>
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#include <linux/spinlock.h>
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#include <linux/wakelock.h>
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#include <linux/hall.h>
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#include <linux/notifier.h>
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#include <linux/sec_class.h>
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#if defined(CONFIG_HALL_NEW_NODE)
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struct device *hall_ic;
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EXPORT_SYMBOL(hall_ic);
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#endif
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struct device *sec_device_create(void *drvdata, const char *fmt);
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struct hall_drvdata {
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struct input_dev *input;
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struct hall_platform_data *pdata;
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#if defined(CONFIG_EMULATE_HALL_IC)
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int emulated_hall_ic_status;
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#endif
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struct work_struct work;
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struct delayed_work flip_cover_dwork;
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struct wake_lock flip_wake_lock;
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u8 event_val;
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};
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static bool flip_cover;
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static ssize_t hall_detect_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if (flip_cover)
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sprintf(buf, "OPEN\n");
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else
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sprintf(buf, "CLOSE\n");
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return strlen(buf);
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}
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static DEVICE_ATTR_RO(hall_detect);
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static struct attribute *hall_attrs[] = {
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&dev_attr_hall_detect.attr,
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NULL,
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};
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static struct attribute_group hall_attr_group = {
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.attrs = hall_attrs,
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};
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#ifdef CONFIG_SEC_FACTORY
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static void flip_cover_work(struct work_struct *work)
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{
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bool first, second;
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struct hall_drvdata *ddata =
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container_of(work, struct hall_drvdata,
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flip_cover_dwork.work);
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first = gpio_get_value(ddata->pdata->gpio_flip_cover);
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pr_info("[keys] %s flip_status #1 : %d (%s)\n", __func__, first,
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first ? "open" : "close");
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msleep(50);
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second = gpio_get_value(ddata->pdata->gpio_flip_cover);
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pr_info("[keys] %s flip_status #2 : %d (%s)\n", __func__, second,
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second ? "open" : "close");
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if (first == second) {
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flip_cover = first;
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input_report_switch(ddata->input, ddata->event_val, !flip_cover);
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input_sync(ddata->input);
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}
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}
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#else
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static void flip_cover_work(struct work_struct *work)
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{
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bool first;
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struct hall_drvdata *ddata =
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container_of(work, struct hall_drvdata,
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flip_cover_dwork.work);
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#if !defined(CONFIG_EMULATE_HALL_IC)
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first = gpio_get_value(ddata->pdata->gpio_flip_cover);
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pr_info("[keys] %s flip_status : %d (%s)\n", __func__, first,
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first ? "open" : "close");
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flip_cover = first;
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input_report_switch(ddata->input, ddata->event_val, !flip_cover);
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input_sync(ddata->input);
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#else
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first = !gpio_get_value(ddata->pdata->gpio_flip_cover_key1)
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& !gpio_get_value(ddata->pdata->gpio_flip_cover_key2);
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pr_info("keys:%s #1 key1=%d,key2=%d : %d\n", __func__,
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gpio_get_value(ddata->pdata->gpio_flip_cover_key1),
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gpio_get_value(ddata->pdata->gpio_flip_cover_key2),
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first);
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if (flip_cover != first) {
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if (first) {
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ddata->emulated_hall_ic_status =
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!ddata->emulated_hall_ic_status;
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pr_info("keys:%s #1 : %d , %d\n", __func__, first,
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ddata->emulated_hall_ic_status);
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input_report_switch(ddata->input, ddata->event_val,
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ddata->emulated_hall_ic_status);
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input_sync(ddata->input);
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}
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flip_cover = first;
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}
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schedule_delayed_work(&ddata->flip_cover_dwork, msecs_to_jiffies(1000));
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#endif
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}
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#endif
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static void __flip_cover_detect(struct hall_drvdata *ddata, bool flip_status)
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{
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cancel_delayed_work_sync(&ddata->flip_cover_dwork);
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#ifdef CONFIG_SEC_FACTORY
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schedule_delayed_work(&ddata->flip_cover_dwork, HZ / 20);
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#else
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if (flip_status) {
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/* 50ms */
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wake_lock_timeout(&ddata->flip_wake_lock, HZ * 5 / 100);
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/* 10ms */
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schedule_delayed_work(&ddata->flip_cover_dwork, HZ * 1 / 100);
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} else {
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wake_unlock(&ddata->flip_wake_lock);
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schedule_delayed_work(&ddata->flip_cover_dwork, 0);
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}
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#endif
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}
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static irqreturn_t flip_cover_detect(int irq, void *dev_id)
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{
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bool flip_status;
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struct hall_drvdata *ddata = dev_id;
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#if !defined(CONFIG_EMULATE_HALL_IC)
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flip_status = gpio_get_value(ddata->pdata->gpio_flip_cover);
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#else
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flip_status = gpio_get_value(ddata->pdata->gpio_flip_cover_key1)
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& gpio_get_value(ddata->pdata->gpio_flip_cover_key2);
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#endif
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pr_info("keys:%s flip_status : %d\n",
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__func__, flip_status);
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__flip_cover_detect(ddata, flip_status);
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return IRQ_HANDLED;
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}
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static int hall_open(struct input_dev *input)
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{
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struct hall_drvdata *ddata = input_get_drvdata(input);
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/* update the current status */
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schedule_delayed_work(&ddata->flip_cover_dwork, HZ / 2);
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/* Report current state of buttons that are connected to GPIOs */
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input_sync(input);
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return 0;
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}
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static void hall_close(struct input_dev *input)
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{
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}
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static void init_hall_ic_irq(struct input_dev *input)
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{
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struct hall_drvdata *ddata = input_get_drvdata(input);
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int ret = 0;
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int irq = ddata->pdata->irq_flip_cover;
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#if !defined(EMUALTE_HALL_IC)
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flip_cover = gpio_get_value(ddata->pdata->gpio_flip_cover);
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#else
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flip_cover = 0;
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#endif
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INIT_DELAYED_WORK(&ddata->flip_cover_dwork, flip_cover_work);
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ret = request_threaded_irq(irq, NULL, flip_cover_detect,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"flip_cover", ddata);
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if (ret < 0) {
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pr_err("keys: failed to request flip cover irq %d gpio %d\n",
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irq, ddata->pdata->gpio_flip_cover);
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} else {
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pr_info("%s : success\n", __func__);
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}
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}
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#if defined(CONFIG_OF)
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static struct hall_platform_data *of_hall_data_parsing_dt(struct device *dev)
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{
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struct device_node *np_hall;
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struct hall_platform_data *pdata;
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int gpio;
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enum of_gpio_flags flags;
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int ret = 0;
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np_hall = dev->of_node;
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if (np_hall == NULL) {
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pr_err("%s : error to get dt node\n", __func__);
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ret = -EINVAL;
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goto err_out;
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}
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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ret = -ENOMEM;
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goto err_out;
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}
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gpio = of_get_named_gpio_flags(np_hall, "hall,gpio_flip_cover", 0,
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&flags);
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if (gpio < 0) {
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pr_err("%s: fail to get flip_cover\n", __func__);
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ret = -EINVAL;
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goto err_out;
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}
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pdata->gpio_flip_cover = gpio;
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pr_info("%s: hall gpio=%d\n", __func__, gpio);
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gpio = gpio_to_irq(gpio);
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if (gpio < 0) {
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pr_err("%s: fail to return irq corresponding gpio\n", __func__);
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ret = -EINVAL;
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goto err_out;
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}
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pdata->irq_flip_cover = gpio;
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pr_info("%s : gpio_flip_cover=%d , irq_flip_cover=%d\n", __func__,
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pdata->gpio_flip_cover, pdata->irq_flip_cover);
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#if defined(CONFIG_EMULATE_HALL_IC)
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gpio = of_get_named_gpio_flags(np_hall, "hall,gpio_flip_cover_key1", 0,
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&flags);
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pdata->gpio_flip_cover_key1 = gpio;
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gpio = of_get_named_gpio_flags(np_hall, "hall,gpio_flip_cover_key2", 0,
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&flags);
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pdata->gpio_flip_cover_key2 = gpio;
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pr_info("%s : cover_key1=%d , cover_key2=%d\n", __func__,
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pdata->gpio_flip_cover_key1,
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pdata->gpio_flip_cover_key2);
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#endif
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return pdata;
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err_out:
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return ERR_PTR(ret);
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}
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#endif
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static int hall_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct hall_drvdata *ddata;
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struct hall_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input;
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int error;
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int wakeup = 0;
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ddata = devm_kzalloc(&pdev->dev, sizeof(struct hall_drvdata),
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GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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#ifdef CONFIG_OF
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if (!pdata) {
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pdata = of_hall_data_parsing_dt(dev);
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if (IS_ERR(pdata)) {
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pr_err("%s : fail to get the dt (HALL)\n", __func__);
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error = -ENODEV;
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goto fail1;
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}
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}
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#endif
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input = input_allocate_device();
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if (!input) {
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dev_err(dev, "failed to allocate state\n");
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error = -ENOMEM;
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goto fail1;
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}
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ddata->input = input;
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wake_lock_init(&ddata->flip_wake_lock, WAKE_LOCK_SUSPEND,
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"flip wake lock");
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ddata->pdata = pdata;
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platform_set_drvdata(pdev, ddata);
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input_set_drvdata(input, ddata);
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input->name = "hall";
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input->phys = "hall";
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input->dev.parent = &pdev->dev;
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input->evbit[0] |= BIT_MASK(EV_SW);
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ddata->event_val = SW_FLIP;
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input_set_capability(input, EV_SW, ddata->event_val);
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input->open = hall_open;
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input->close = hall_close;
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/* Enable auto repeat feature of Linux input subsystem */
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__set_bit(EV_REP, input->evbit);
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init_hall_ic_irq(input);
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#if defined(CONFIG_HALL_NEW_NODE)
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hall_ic = sec_device_create(ddata, "hall_ic");
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error = sysfs_create_group(&hall_ic->kobj, &hall_attr_group);
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#else
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error = sysfs_create_group(&sec_key->kobj, &hall_attr_group);
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#endif
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if (error) {
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dev_err(dev, "Unable to export keys/switches, error: %d\n",
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error);
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goto fail2;
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}
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error = input_register_device(input);
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if (error) {
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dev_err(dev, "Unable to register input device, error: %d\n",
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error);
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goto fail3;
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}
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device_init_wakeup(&pdev->dev, wakeup);
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return 0;
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fail3:
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sysfs_remove_group(&pdev->dev.kobj, &hall_attr_group);
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fail2:
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platform_set_drvdata(pdev, NULL);
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wake_lock_destroy(&ddata->flip_wake_lock);
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input_free_device(input);
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fail1:
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kfree(ddata);
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return error;
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}
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static int hall_remove(struct platform_device *pdev)
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{
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struct hall_drvdata *ddata = platform_get_drvdata(pdev);
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struct input_dev *input = ddata->input;
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pr_info("%s start\n", __func__);
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sysfs_remove_group(&pdev->dev.kobj, &hall_attr_group);
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device_init_wakeup(&pdev->dev, 0);
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input_unregister_device(input);
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wake_lock_destroy(&ddata->flip_wake_lock);
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kfree(ddata);
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return 0;
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}
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#if defined(CONFIG_OF)
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static const struct of_device_id hall_dt_ids[] = {
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{ .compatible = "hall" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, hall_dt_ids);
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#endif /* CONFIG_OF */
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#ifdef CONFIG_PM_SLEEP
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static int hall_suspend(struct device *dev)
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{
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struct hall_drvdata *ddata = dev_get_drvdata(dev);
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struct input_dev *input = ddata->input;
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bool status;
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pr_info("%s start\n", __func__);
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status = gpio_get_value(ddata->pdata->gpio_flip_cover);
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pr_info("[keys] %s flip_status : %d (%s)\n", __func__, status,
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status ? "open" : "close");
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/*
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* need to be change
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* Without below one line, it is not able to get the irq
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* during freezing
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*/
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enable_irq_wake(ddata->pdata->irq_flip_cover);
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if (device_may_wakeup(dev)) {
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enable_irq_wake(ddata->pdata->irq_flip_cover);
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} else {
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mutex_lock(&input->mutex);
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if (input->users)
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hall_close(input);
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mutex_unlock(&input->mutex);
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}
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return 0;
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}
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static int hall_resume(struct device *dev)
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{
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struct hall_drvdata *ddata = dev_get_drvdata(dev);
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struct input_dev *input = ddata->input;
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bool status;
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pr_info("%s start\n", __func__);
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status = gpio_get_value(ddata->pdata->gpio_flip_cover);
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pr_info("[keys] %s flip_status : %d (%s)\n", __func__, status,
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status ? "open" : "close");
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input_sync(input);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(hall_pm_ops, hall_suspend, hall_resume);
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static struct platform_driver hall_device_driver = {
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.probe = hall_probe,
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.remove = hall_remove,
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.driver = {
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.name = "hall",
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.owner = THIS_MODULE,
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.pm = &hall_pm_ops,
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#if defined(CONFIG_OF)
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.of_match_table = hall_dt_ids,
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#endif /* CONFIG_OF */
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}
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};
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static int __init hall_init(void)
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{
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pr_info("%s start\n", __func__);
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return platform_driver_register(&hall_device_driver);
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}
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static void __exit hall_exit(void)
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{
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pr_info("%s start\n", __func__);
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platform_driver_unregister(&hall_device_driver);
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}
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late_initcall(hall_init);
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module_exit(hall_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Insun Choi <insun77.choi@samsung.com>");
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MODULE_DESCRIPTION("Hall IC driver for GPIOs");
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MODULE_ALIAS("platform:gpio-keys");
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