drivers/amlogic/input/keyboard/gpio_keypad_old.c

/*
 * drivers/amlogic/input/keyboard/gpio_keypad.c
 *
 * Copyright (C) 2017 Amlogic, Inc. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/of_irq.h>

#include <asm/irq.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <uapi/linux/input.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/of.h>
#include <linux/amlogic/aml_gpio_consumer.h>
#include <linux/amlogic/gpio-amlogic.h>
#include <linux/amlogic/sd.h>
#include <linux/amlogic/iomap.h>
#include <linux/amlogic/cpu_version.h>
#include <linux/amlogic/pm.h>
#include <linux/of_address.h>
#include "../../../gpio/gpiolib.h"

#define OFFSET  24

#define MOD_NAME       "gpio_key"

#undef pr_fmt
#define pr_fmt(fmt) "gpio_key: " fmt

struct gpio_key {
	int code;	  /* input key code */
	const char *name;
	int pin;    /*pin number*/
	int status; /*0 up ,  1 down*/
};

struct gpio_platform_data {
	struct gpio_key *key;
	int key_num;
	int repeat_delay;
	int repeat_period;
	int irq_keyup;
	int irq_keydown;
};

struct kp {
	struct input_dev *input;
	struct timer_list timer;
	int config_major;
	char config_name[20];
	struct class *config_class;
	struct device *config_dev;
	struct gpio_key *keys;
	int key_num;
	struct work_struct work_update;
};

static struct kp *gp_kp;

int amlogic_gpio_name_map_num(struct platform_device *pdev, const char *value)
{
	return of_property_read_string(pdev->dev.of_node, "key_pin",  &value);
}


static void kp_work(struct kp *kp)
{
	struct gpio_key *key;
	int i;
	int io_status;

	key = kp->keys;
	for (i = 0; i < kp->key_num; i++) {
		io_status = gpiod_get_value(gpio_to_desc(key->pin));
		if (io_status != key->status) {
			if (io_status) {
				dev_info(&kp->input->dev,
					 "key %d up\n", key->code);
				input_report_key(kp->input,  key->code, 0);
				input_sync(kp->input);
			} else {
				dev_info(&kp->input->dev,
					 "key %d down\n", key->code);
				input_report_key(kp->input, key->code, 1);
				input_sync(kp->input);
			}
			key->status = io_status;
		}
		key++;
	}
}

static void update_work_func(struct work_struct *work)
{
	struct kp *kp_data = container_of(work, struct kp, work_update);

	kp_work(kp_data);
}

/*
 * What we do here is just for loss wakeup key when suspend.
 * In suspend routine ,  the intr is disable.
 * we need do more things to adapt the gpio change.
 */
int det_pwr_key(void)
{
	/*return aml_read_reg32(P_AO_IRQ_STAT) & (1<<8);*/
	return 0;
}
/*Enable gpio interrupt for AO domain interrupt*/
void set_pwr_key(void)
{
	/* aml_write_reg32(P_AO_IRQ_GPIO_REG,
	 * aml_read_reg32(P_AO_IRQ_GPIO_REG)|(1<<18)|(1<<16)|(0x3<<0));
	 * aml_write_reg32(P_AO_IRQ_MASK_FIQ_SEL,
	 * aml_read_reg32(P_AO_IRQ_MASK_FIQ_SEL)|(1<<8));
	 * aml_set_reg32_mask(P_AO_IRQ_STAT_CLR, 1<<8);
	 */
}

void clr_pwr_key(void)
{
	/*aml_set_reg32_mask(P_AO_IRQ_STAT_CLR, 1<<8);*/
}


#ifdef USE_IRQ

static irqreturn_t kp_isr(int irq,  void *data)
{
	struct kp *kp_data = (struct kp *)data;

	queue_work(system_freezable_wq, &(kp_data->work_update));

	/* if (!deep_suspend_flag)
	 *	clr_pwr_key();
	 */
	return IRQ_HANDLED;
}

#else
void kp_timer_sr(unsigned long data)
{
	struct kp *kp_data = (struct kp *)data;

	queue_work(system_freezable_wq, &(kp_data->work_update));
	mod_timer(&kp_data->timer, jiffies+msecs_to_jiffies(25));
}
#endif
static int gpio_key_config_open(struct inode *inode,  struct file *file)
{
	file->private_data = gp_kp;
	return 0;
}

static int gpio_key_config_release(struct inode *inode,  struct file *file)
{
	file->private_data = NULL;
	return 0;
}

static const struct file_operations keypad_fops = {
	.owner      = THIS_MODULE,
	.open       = gpio_key_config_open,
	.release    = gpio_key_config_release,
};

static int register_keypad_dev(struct kp  *kp)
{
	int ret = 0;
	char name[] = "gpio_keyboard";

	strncpy(kp->config_name, name, sizeof(name));
	ret = register_chrdev(0, kp->config_name, &keypad_fops);
	if (ret <= 0) {
		dev_info(&kp->input->dev, "register char device error\n");
		return  ret;
	}
	kp->config_major = ret;
	dev_info(&kp->input->dev, "gpio keypad major:%d\n", ret);
	kp->config_class = class_create(THIS_MODULE, kp->config_name);
	kp->config_dev = device_create(kp->config_class, NULL,
		MKDEV(kp->config_major, 0), NULL, kp->config_name);
	return ret;
}

static int gpio_key_probe(struct platform_device *pdev)
{
	const char *str;
	struct kp *kp;
	struct input_dev *input_dev;
	int i,  ret,  key_size;
	struct gpio_key *key;
	struct gpio_platform_data *pdata = NULL;
	struct gpio_desc *desc;
	int *key_param = NULL;
	int state = -EINVAL;
#ifdef USE_IRQ
	int irq_keyup;
	int irq_keydown;
#endif

	int gpio_highz = 0;

	if (!pdev->dev.of_node) {
		dev_info(&pdev->dev, "gpio_key: pdev->dev.of_node == NULL!\n");
		state = -EINVAL;
		goto get_key_node_fail;
	}
	ret = of_property_read_u32(pdev->dev.of_node, "key_num", &key_size);
	if (ret) {
		dev_info(&pdev->dev, "gpio_key: failed to get key_num!\n");
		state = -EINVAL;
		goto get_key_node_fail;
	}

	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
		state = -EINVAL;
		goto get_key_node_fail;
	}

	ret = of_property_read_bool(pdev->dev.of_node,  "gpio_high_z");
	if (ret) {
		gpio_highz = 1;
		dev_info(&pdev->dev, "gpio request set to High-Z status\n");
	}

	pdata->key = kcalloc(key_size, sizeof(*(pdata->key)), GFP_KERNEL);
	if (!(pdata->key)) {
		dev_err(&pdev->dev,  "platform key is required!\n");
		goto get_key_mem_fail;
	}

	pdata->key_num = key_size;
	for (i = 0; i < key_size; i++) {
		ret = of_property_read_string_index(pdev->dev.of_node,
			 "key_name", i, &(pdata->key[i].name));
		if (ret < 0) {
			dev_info(&pdev->dev,
				 "gpio_key: find key_name=%d finished\n", i);
			break;
		}
	}
	key_param = kzalloc((sizeof(*key_param))*(pdata->key_num), GFP_KERNEL);
	if (!key_param)
		goto get_param_mem_fail;
	ret = of_property_read_u32_array(pdev->dev.of_node,
		 "key_code", key_param,  pdata->key_num);
	if (ret) {
		dev_info(&pdev->dev, "gpio_key: failed to get key_code!\n");
		goto get_key_param_failed;
	}

	for (i = 0; i < pdata->key_num; i++) {
		pdata->key[i].code = *(key_param+i);
		pdata->key[i].status = -1;
	}

#ifdef USE_IRQ
		pdata->irq_keyup = irq_of_parse_and_map(pdev->dev.of_node, 0);
		pdata->irq_keydown = irq_of_parse_and_map(pdev->dev.of_node, 1);
		pdata->irq_keyup = irq_keyup;
		pdata->irq_keydown = irq_keydown;
		pr_info("irq_keyup:%d,irq_keydown:%d\n",
				pdata->irq_keyup, pdata->irq_keydown);
#endif

	for (i = 0; i < key_size; i++) {
		ret = of_property_read_string_index(pdev->dev.of_node,
			"key_pin", i, &str);
		dev_info(&pdev->dev, "gpio_key: %d name(%s) pin(%s)\n",
			 i, (pdata->key[i].name), str);
		if (ret < 0) {
			dev_info(&pdev->dev,
				 "gpio_key: find key_name=%d finished\n", i);
			break;
		}
		ret = amlogic_gpio_name_map_num(pdev, str);
		dev_info(&pdev->dev, "amlogic_gpio_name_map_num pin %d!%s::\n",
			 ret, str);
		if (ret < 0) {
			dev_info(&pdev->dev, "gpio_key bad pin !\n");
			goto get_key_param_failed;
		}
		desc = of_get_named_gpiod_flags(pdev->dev.of_node,
			"key_pin",  i,  NULL);
		pdata->key[i].pin = desc_to_gpio(desc);
		dev_info(&pdev->dev, "gpio_key: %d %s(%d)\n", i,
			 (pdata->key[i].name),  pdata->key[i].pin);
		/*pdata->key[i].pin = ret;*/
		gpio_request(pdata->key[i].pin,  MOD_NAME);
		if (!gpio_highz) {
			gpio_direction_input(pdata->key[i].pin);
			gpiod_set_pull(desc, GPIOD_PULL_UP);
		}
#ifdef USE_IRQ
		gpio_for_irq(pdata->key[i].pin,
		AML_GPIO_IRQ(irq_keyup,  FILTER_NUM7, IRQF_TRIGGER_RISING));
		gpio_for_irq(pdata->key[i].pin,
		AML_GPIO_IRQ(irq_keydown,  FILTER_NUM7, IRQF_TRIGGER_FALLING));
#endif
	}

	kp = kzalloc(sizeof(struct kp),  GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!kp || !input_dev) {
		kfree(kp);
		input_free_device(input_dev);
		state = -ENOMEM;
		goto get_key_param_failed;
	}
	gp_kp = kp;
	platform_set_drvdata(pdev,  pdata);
	kp->input = input_dev;
	INIT_WORK(&(kp->work_update),  update_work_func);
#ifdef USE_IRQ
	if (request_irq(irq_keyup, kp_isr, IRQF_DISABLED,
			 "irq_keyup",  kp)) {
		dev_info(&pdev->dev,  "Failed to request gpio key up irq.\n");
		kfree(kp);
		input_free_device(input_dev);
		state = -EINVAL;
		goto get_key_param_failed;
	}

	if (request_irq(irq_keydown, kp_isr, IRQF_DISABLED,
		 "irq_keydown",  kp)) {
		dev_info(&pdev->dev,  "Failed to request gpio key down irq.\n");
		kfree(kp);
		input_free_device(input_dev);
		state = -EINVAL;
		goto get_key_param_failed;
	}
#else
	dev_info(&pdev->dev, "start setup_timer");
	setup_timer(&kp->timer,  kp_timer_sr,  (unsigned long) kp);
	mod_timer(&kp->timer,  jiffies+msecs_to_jiffies(100));
#endif
	/* setup input device */
	set_bit(EV_KEY,  input_dev->evbit);
	set_bit(EV_REP,  input_dev->evbit);
	kp->keys = pdata->key;
	kp->key_num = pdata->key_num;
	key = pdata->key;

	for (i = 0; i < kp->key_num; i++) {
		set_bit(pdata->key[i].code,  input_dev->keybit);
		dev_info(&pdev->dev, "%s key(%d) registed.\n",
			 key->name, pdata->key[i].code);
	}
	input_dev->name = "gpio_keypad";
	input_dev->phys = "gpio_keypad/input0";
	input_dev->dev.parent = &pdev->dev;

	input_dev->id.bustype = BUS_ISA;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;

	input_dev->rep[REP_DELAY] = 0xffffffff;
	input_dev->rep[REP_PERIOD] = 0xffffffff;

	input_dev->keycodesize = sizeof(unsigned short);
	input_dev->keycodemax = 0x1ff;
	ret = input_register_device(kp->input);
	if (ret < 0) {
		dev_err(&pdev->dev,  "Unable to register keypad input device.\n");
		kfree(kp);
		input_free_device(input_dev);
		state = -EINVAL;
		goto get_key_param_failed;
	}
/*set_pwr_key();*/
	dev_info(&pdev->dev, "gpio keypad register input device completed.\n");
	register_keypad_dev(gp_kp);
	kfree(key_param);
	return 0;

get_key_param_failed:
	kfree(key_param);
get_param_mem_fail:
	kfree(pdata->key);
get_key_mem_fail:
	kfree(pdata);
get_key_node_fail:
	return state;
}

static int gpio_key_remove(struct platform_device *pdev)
{
	struct gpio_platform_data *pdata = platform_get_drvdata(pdev);
	struct kp *kp = gp_kp;

	input_unregister_device(kp->input);
	input_free_device(kp->input);
	unregister_chrdev(kp->config_major,  kp->config_name);
	if (kp->config_class) {
		if (kp->config_dev)
			device_destroy(kp->config_class,
			    MKDEV(kp->config_major, 0));
		class_destroy(kp->config_class);
	}
	kfree(kp);
#ifdef CONFIG_OF
	kfree(pdata->key);
	kfree(pdata);
#endif
	gp_kp = NULL;
	return 0;
}

static int gpio_key_suspend(struct platform_device *dev,  pm_message_t state)
{
	return 0;
}

static int gpio_key_resume(struct platform_device *dev)
{
	int i;
	struct gpio_platform_data *pdata;

	pdata = (struct gpio_platform_data *)platform_get_drvdata(dev);

	if (get_resume_method() == POWER_KEY_WAKEUP) {
		for (i = 0; i < pdata->key_num; i++) {
			if (pdata->key[i].code == KEY_POWER) {
				pr_info("gpio keypad wakeup\n");

				input_report_key(gp_kp->input,  KEY_POWER,  1);
				input_sync(gp_kp->input);
				input_report_key(gp_kp->input,  KEY_POWER,  0);
				input_sync(gp_kp->input);

				break;
			}
		}
	}
	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id key_dt_match[] = {
	{	.compatible = "amlogic, gpio_keypad", },
	{},
};
#else
#define key_dt_match NULL
#endif

static struct platform_driver gpio_driver = {
	.probe = gpio_key_probe,
	.remove = gpio_key_remove,
	.suspend = gpio_key_suspend,
	.resume = gpio_key_resume,
	.driver = {
		.name = "gpio-key",
		.of_match_table = key_dt_match,
	},
};

static int __init gpio_key_init(void)
{
	return platform_driver_register(&gpio_driver);
}

static void __exit gpio_key_exit(void)
{
	platform_driver_unregister(&gpio_driver);
}

module_init(gpio_key_init);
module_exit(gpio_key_exit);

MODULE_AUTHOR("Frank Chen");
MODULE_DESCRIPTION("GPIO Keypad Driver");
MODULE_LICENSE("GPL");