// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 Awinic Inc.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/firmware.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/gameport.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
/*(LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)) */
#include <linux/device.h>
#include <linux/pm_wakeup.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/hrtimer.h>
#include <linux/aw87519_audio.h>

/*******************************************************************************
 * aw87519 marco
 ******************************************************************************/
#define AW87519_LEFT_I2C_NAME    "AW87519_LEFT_PA"
#define AW87519_LEFT_DRIVER_VERSION  "v1.0.1"

static unsigned char aw87519_spk_cfg_default[] = {
	0x01, 0xF0,
	0x02, 0x09,
	0x03, 0xE8,
	0x04, 0x11,
	0x05, 0x10,
	0x06, 0x43,
	0x07, 0x4E,
	0x08, 0x03,
	0x09, 0x08,
	0x0A, 0x4A,
	0x60, 0x16,
	0x61, 0x20,
	0x62, 0x01,
	0x63, 0x0B,
	0x64, 0xC5,
	0x65, 0xA4,
	0x66, 0x78,
	0x67, 0xC4,
	0x68, 0XD0
};

static unsigned char aw87519_rcv_cfg_default[] = {
	0x01, 0xF8,
	0x02, 0x09,
	0x03, 0xC8,
	0x04, 0x11,
	0x05, 0x05,
	0x06, 0x53,
	0x07, 0x4E,
	0x08, 0x0B,
	0x09, 0x08,
	0x0A, 0x4B,
	0x60, 0x16,
	0x61, 0x20,
	0x62, 0x01,
	0x63, 0x0B,
	0x64, 0xC5,
	0x65, 0xA4,
	0x66, 0x78,
	0x67, 0xC4,
	0x68, 0XD0
};

struct aw87519_container {
	int len;
	unsigned char data[];
};

struct aw87519 {
	struct i2c_client *i2c_client;
	int reset_gpio;
	unsigned char hwen_flag;
	unsigned char spk_cfg_update_flag;
	unsigned char rcv_cfg_update_flag;
	unsigned char spk_cfg_data[sizeof(aw87519_spk_cfg_default) /
								sizeof(char)];
	unsigned char rcv_cfg_data[sizeof(aw87519_rcv_cfg_default) /
								sizeof(char)];
	struct hrtimer cfg_timer;
	struct mutex cfg_lock;
	struct work_struct cfg_work;
	struct delayed_work ram_work;
};

/*******************************************************************************
 * aw87519 variable
 ******************************************************************************/
static struct aw87519 *aw87519;
static struct aw87519_container *aw87519_spk_cnt;
static struct aw87519_container *aw87519_rcv_cnt;

static char *aw87519_spk_name = "aw87519_left_spk.bin";
static char *aw87519_rcv_name = "aw87519_left_rcv.bin";

/*******************************************************************************
 * i2c write and read
 ******************************************************************************/
static int aw87519_i2c_write(struct aw87519 *aw87519,
			     unsigned char reg_addr, unsigned char reg_data)
{
	int ret = -1;
	unsigned char cnt = 0;

	while (cnt < AW_I2C_RETRIES) {
		ret = i2c_smbus_write_byte_data(aw87519->i2c_client,
						reg_addr,
						reg_data);
		if (ret < 0)
			pr_err("%s: i2c_write cnt=%d error=%d\n",
			__func__, cnt, ret);
		else
			break;

		cnt++;
		msleep(AW_I2C_RETRY_DELAY);
	}

	return ret;
}

static int aw87519_i2c_read(struct aw87519 *aw87519,
			    unsigned char reg_addr, unsigned char *reg_data)
{
	int ret = -1;
	unsigned char cnt = 0;

	while (cnt < AW_I2C_RETRIES) {
		ret = i2c_smbus_read_byte_data(aw87519->i2c_client, reg_addr);
		if (ret < 0) {
			pr_err("%s: i2c_read cnt=%d error=%d\n",
				__func__, cnt, ret);
		} else {
			*reg_data = ret;
			break;
		}
		cnt++;
		msleep(AW_I2C_RETRY_DELAY);
	}

	return ret;
}

/*******************************************************************************
 * aw87519 hardware control
 ******************************************************************************/
static unsigned int aw87519_hw_on(struct aw87519 *aw87519)
{
	pr_info("%s left enter\n", __func__);

	if (aw87519 && gpio_is_valid(aw87519->reset_gpio)) {
		gpio_set_value_cansleep(aw87519->reset_gpio, 0);
		usleep_range(2000, 2500);
		gpio_set_value_cansleep(aw87519->reset_gpio, 1);
		usleep_range(2000, 2500);
		aw87519->hwen_flag = 1;
		aw87519_i2c_write(aw87519, 0x64, 0x2C);
	} else {
		dev_err(&aw87519->i2c_client->dev, "%s:  failed\n", __func__);
	}

	return 0;
}

static unsigned int aw87519_hw_off(struct aw87519 *aw87519)
{
	pr_info("%s enter\n", __func__);

	if (aw87519 && gpio_is_valid(aw87519->reset_gpio)) {
		gpio_set_value_cansleep(aw87519->reset_gpio, 0);
		usleep_range(2000, 2500);
		aw87519->hwen_flag = 0;
	} else {
		dev_err(&aw87519->i2c_client->dev, "%s:  failed\n", __func__);
	}
	return 0;
}


/*******************************************************************************
 * aw87519 control interface
 ******************************************************************************/
unsigned char aw87519_left_audio_receiver(void)
{
	unsigned int i;
	unsigned int length;

	if (aw87519 == NULL)
		return 2;

	if (!aw87519->hwen_flag)
		aw87519_hw_on(aw87519);

	aw87519_i2c_write(aw87519, 0x69, 0x80);
	aw87519_i2c_write(aw87519, 0x69, 0xB7);

	length = sizeof(aw87519_spk_cfg_default) / sizeof(char);
	if (aw87519->rcv_cfg_update_flag == 0) {	/*update array data */
		for (i = 0; i < length; i = i + 2) {
			aw87519_i2c_write(aw87519, aw87519_rcv_cfg_default[i],
					  aw87519_rcv_cfg_default[i + 1]);
		}
	}
	if (aw87519->rcv_cfg_update_flag == 1) {	/*update bin data */
		for (i = 0; i < length; i = i + 2) {
			aw87519_i2c_write(aw87519, aw87519->rcv_cfg_data[i],
					  aw87519->rcv_cfg_data[i + 1]);
		}
	}

	return 0;
}

unsigned char aw87519_amp_lch_on(void)
{
	unsigned int i;
	unsigned int length;

	if (aw87519 == NULL)
		return 2;

	if (!aw87519->hwen_flag)
		aw87519_hw_on(aw87519);

	aw87519_i2c_write(aw87519, 0x69, 0x80);
	aw87519_i2c_write(aw87519, 0x69, 0xB7);

	length = sizeof(aw87519_spk_cfg_default) / sizeof(char);
	if (aw87519->spk_cfg_update_flag == 0) {	/*send array data */
		for (i = 0; i < length; i = i + 2) {
			aw87519_i2c_write(aw87519, aw87519_spk_cfg_default[i],
					  aw87519_spk_cfg_default[i + 1]);
		}
	}
	if (aw87519->spk_cfg_update_flag == 1) {	/*send bin data */
		for (i = 0; i < length; i = i + 2) {
			aw87519_i2c_write(aw87519, aw87519->spk_cfg_data[i],
					  aw87519->spk_cfg_data[i + 1]);
		}
	}

	return 0;
}

unsigned char aw87519_amp_lch_off(void)
{
	pr_info("%s enter\n", __func__);

	if (aw87519 == NULL)
		return 2;

	if (aw87519->hwen_flag)
		aw87519_i2c_write(aw87519, 0x01, 0x00); /*CHIP Disable*/

	aw87519_hw_off(aw87519);

	return 0;
}

/*******************************************************************************
 * aw87519 firmware cfg update
 ******************************************************************************/
static void
aw87519_receiver_cfg_loaded(const struct firmware *cont, void *context)
{
	int i = 0;

	pr_info("%s enter\n", __func__);

	if (!cont) {
		pr_err("%s: failed to read %s\n", __func__, aw87519_rcv_name);
		release_firmware(cont);
		return;
	}

	pr_info("%s: loaded %s - size: %zu\n",
		__func__, aw87519_rcv_name, cont ? cont->size : 0);

	for (i = 0; i < cont->size; i++)
		pr_info("%s: addr:0x%04x, data:0x%02x\n",
			__func__, i, *(cont->data + i));


	/* aw87519 ram update */
	aw87519_rcv_cnt = kzalloc(cont->size + sizeof(int), GFP_KERNEL);
	if (!aw87519_rcv_cnt) {
		release_firmware(cont);
		pr_err("%s: Error allocating memory\n", __func__);
		return;
	}
	aw87519_rcv_cnt->len = cont->size;
	for (i = 0; i < aw87519_rcv_cnt->len; i++)
		aw87519->rcv_cfg_data[i] = *(cont->data + i);

	release_firmware(cont);

	kfree(aw87519_rcv_cnt);

	pr_info("%s: fw update complete\n", __func__);
}

static int aw87519_rcv_update(struct aw87519 *aw87519)
{
	pr_info("%s enter\n", __func__);
	return request_firmware_nowait(THIS_MODULE,
				       FW_ACTION_HOTPLUG,
				       aw87519_rcv_name,
				       &aw87519->i2c_client->dev,
				       GFP_KERNEL,
				       aw87519,
				       aw87519_receiver_cfg_loaded);
}

static void
aw87519_speaker_cfg_loaded(const struct firmware *cont, void *context)
{
	int i = 0;

	pr_info("%s enter\n", __func__);

	if (!cont) {
		pr_err("%s: failed to read %s\n", __func__, aw87519_spk_name);
		release_firmware(cont);
		return;
	}

	pr_info("%s: loaded %s - size: %zu\n",
		__func__, aw87519_spk_name, cont ? cont->size : 0);

	for (i = 0; i < cont->size; i++)
		pr_info("%s: addr:0x%04x, data:0x%02x\n",
			__func__, i, *(cont->data + i));

	/* aw87519 ram update */
	aw87519_spk_cnt = kzalloc(cont->size + sizeof(int), GFP_KERNEL);
	if (!aw87519_spk_cnt) {
		release_firmware(cont);
		pr_err("%s: Error allocating memory\n", __func__);
		return;
	}
	aw87519_spk_cnt->len = cont->size;
	for (i = 0; i < aw87519_spk_cnt->len; i++)
		aw87519->spk_cfg_data[i] = *(cont->data + i);

	release_firmware(cont);

	kfree(aw87519_spk_cnt);

	pr_info("%s: fw update complete\n", __func__);

	aw87519_rcv_update(aw87519);
}


#ifdef AWINIC_CFG_UPDATE_DELAY
static int aw87519_cfg_update(struct aw87519 *aw87519)
{
	pr_info("%s enter\n", __func__);

	return request_firmware_nowait(THIS_MODULE,
				       FW_ACTION_HOTPLUG,
				       aw87519_spk_name,
				       &aw87519->i2c_client->dev,
				       GFP_KERNEL,
				       aw87519,
				       aw87519_speaker_cfg_loaded);
}

static void aw87519_cfg_work_routine(struct work_struct *work)
{
	pr_info("%s enter\n", __func__);
	aw87519_cfg_update(aw87519);
}
#endif


static int aw87519_cfg_init(struct aw87519 *aw87519)
{
	int ret = -1;
#ifdef AWINIC_CFG_UPDATE_DELAY
	int cfg_timer_val = 5000;

	INIT_DELAYED_WORK(&aw87519->ram_work, aw87519_cfg_work_routine);
	schedule_delayed_work(&aw87519->ram_work,
			      msecs_to_jiffies(cfg_timer_val));
	ret = 0;
#endif
	return ret;
}

/*******************************************************************************
 * aw87519 attribute
 ******************************************************************************/
static ssize_t aw87519_get_reg(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	ssize_t len = 0;
	unsigned int i = 0;
	unsigned char reg_val = 0;

	for (i = 0; i < AW87519_REG_MAX; i++) {
		aw87519_i2c_read(aw87519, i, &reg_val);
		len += snprintf(buf + len, PAGE_SIZE - len,
				"reg:0x%02x=0x%02x\n", i, reg_val);
	}
	return len;
}

static ssize_t aw87519_set_reg(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
	unsigned int databuf[2] = { 0, 0 };

	if (sscanf(buf, "%x %x", &databuf[0], &databuf[1]) == 2)
		aw87519_i2c_write(aw87519, databuf[0], databuf[1]);

	return len;
}


static ssize_t aw87519_get_hwen(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	ssize_t len = 0;

	len += snprintf(buf + len, PAGE_SIZE - len, "hwen: %d\n",
			aw87519->hwen_flag);

	return len;
}

static ssize_t aw87519_set_hwen(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
	int databuf;
	int ret = 0;

	ret = kstrtoint(buf, 10, &databuf);
	if (ret != 0) {
		pr_err("Incorrect argument\n");
		return len;
	}

	if (databuf == 0)
		aw87519_hw_off(aw87519);
	else
		aw87519_hw_on(aw87519);

	return len;
}

static ssize_t aw87519_get_update(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	ssize_t len = 0;

	return len;
}

static ssize_t aw87519_set_update(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
	int databuf;
	int ret;

	ret = kstrtoint(buf, 10, &databuf);
	if (ret != 0) {
		pr_err("Incorrect argument\n");
		return len;
	}

	if (databuf == 0) {
	} else {
		aw87519->spk_cfg_update_flag = 1;
		aw87519->rcv_cfg_update_flag = 1;
		ret = request_firmware_nowait(THIS_MODULE,
					      FW_ACTION_HOTPLUG,
					      aw87519_spk_name,
					      &aw87519->i2c_client->dev,
					      GFP_KERNEL,
					      aw87519,
					      aw87519_speaker_cfg_loaded);
		if (ret) {
			pr_err("%s: request firmware failed with read %s",
				__func__, aw87519_spk_name);
		}
	}

	return len;
}

static ssize_t aw87519_get_mode(struct device *cd,
				struct device_attribute *attr, char *buf)
{
	ssize_t len = 0;

	len += snprintf(buf + len, PAGE_SIZE - len, "0: off mode\n");
	len += snprintf(buf + len, PAGE_SIZE - len, "1: spk mode\n");
	len += snprintf(buf + len, PAGE_SIZE - len, "2: rcv mode\n");

	return len;
}

static ssize_t aw87519_set_mode(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t len)
{
	int databuf;
	int ret = 0;

	ret = kstrtoint(buf, 10, &databuf);
	if (ret != 0) {
		pr_err("Incorrect argument\n");
		return len;
	}

	if (databuf == 0)
		aw87519_amp_lch_off();
	else if (databuf == 1)
		aw87519_amp_lch_on();
	else if (databuf == 2)
		aw87519_left_audio_receiver();
	else
		aw87519_amp_lch_off();

	return len;
}

static DEVICE_ATTR(reg, AW87519_VAL, aw87519_get_reg, aw87519_set_reg);
static DEVICE_ATTR(hwen, AW87519_VAL, aw87519_get_hwen, aw87519_set_hwen);
static DEVICE_ATTR(update, AW87519_VAL, aw87519_get_update, aw87519_set_update);
static DEVICE_ATTR(mode, AW87519_VAL, aw87519_get_mode, aw87519_set_mode);

static struct attribute *aw87519_attributes[] = {
	&dev_attr_reg.attr,
	&dev_attr_hwen.attr,
	&dev_attr_update.attr,
	&dev_attr_mode.attr,
	NULL
};

static struct attribute_group aw87519_attribute_group = {
	.attrs = aw87519_attributes
};

/*****************************************************
 * device tree
 *****************************************************/
static int aw87519_parse_dt(struct device *dev, struct device_node *np)
{
	pr_info("%s enter\n", __func__);

	aw87519->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
	if (aw87519->reset_gpio >= 0) {
		dev_info(dev, "%s: reset gpio provided ok\n", __func__);
	} else {
		dev_err(dev, "%s: reset gpio provided failed.\n", __func__);
		return -1;
	}
	return 0;
}

static int aw87519_hw_reset(struct aw87519 *aw87519)
{
	pr_info("%s enter\n", __func__);

	if (aw87519 && gpio_is_valid(aw87519->reset_gpio)) {
		gpio_set_value_cansleep(aw87519->reset_gpio, 0);
		usleep_range(2000, 2500);
		gpio_set_value_cansleep(aw87519->reset_gpio, 1);
		usleep_range(2000, 2500);
		aw87519->hwen_flag = 1;
	} else {
		aw87519->hwen_flag = 0;
		dev_err(&aw87519->i2c_client->dev, "%s:  failed\n", __func__);
	}
	return 0;
}

/*****************************************************
 * check chip id
 *****************************************************/
static int aw87519_read_chipid(struct aw87519 *aw87519)
{
	unsigned int cnt = 0;
	int ret = -1;
	unsigned char reg_val = 0;

	while (cnt < AW_READ_CHIPID_RETRIES) {
		aw87519_i2c_write(aw87519, 0x64, 0x2C);
		ret = aw87519_i2c_read(aw87519, REG_CHIPID, &reg_val);
		if (reg_val != AW87519_CHIPID)
			pr_info("%s: aw87519 chipid=0x%x error\n",
				__func__, reg_val);
		else {
			pr_info("%s This Chip is  AW87519 chipid=0x%x\n",
				__func__, reg_val);
			return 0;
		}
		cnt++;
		msleep(AW_READ_CHIPID_RETRY_DELAY);
	}

	return -EINVAL;
}

/*******************************************************************************
 * aw87519 i2c driver
 ******************************************************************************/
static int
aw87519_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct device_node *np = client->dev.of_node;
	int ret = -1;

	pr_info("%s left Enter\n", __func__);

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "%s: check_functionality failed\n",
			__func__);
		ret = -ENODEV;
		goto exit_check_functionality_failed;
	}

	aw87519 = devm_kzalloc(&client->dev, sizeof(struct aw87519),
							GFP_KERNEL);
	if (aw87519 == NULL) {
		ret = -ENOMEM;
		goto exit_devm_kzalloc_failed;
	}

	aw87519->i2c_client = client;
	i2c_set_clientdata(client, aw87519);

	/* aw87519 rst */
	if (np) {
		ret = aw87519_parse_dt(&client->dev, np);
		if (ret) {
			dev_err(&client->dev,
				"%s: failed to parse device tree node\n",
				__func__);
			goto exit_gpio_get_failed;
		}
	} else {
		aw87519->reset_gpio = -1;
	}

	if (gpio_is_valid(aw87519->reset_gpio)) {
		ret = devm_gpio_request_one(&client->dev, aw87519->reset_gpio,
					    GPIOF_OUT_INIT_LOW, "aw87519_rst");
		if (ret) {
			dev_err(&client->dev, "%s: rst request failed\n",
				__func__);
			goto exit_gpio_request_failed;
		}
	}

	/* hardware reset */
	aw87519_hw_reset(aw87519);

	/* aw87519 chip id */
	ret = aw87519_read_chipid(aw87519);
	if (ret < 0) {
		dev_err(&client->dev, "%s: aw87519_read_chipid failed ret=%d\n",
			__func__, ret);
		goto exit_i2c_check_id_failed;
	}

	ret = sysfs_create_group(&client->dev.kobj, &aw87519_attribute_group);
	if (ret < 0)
		dev_info(&client->dev, "%s error creating sysfs attr files\n",
			__func__);

	/* aw87519 cfg update */
	aw87519->spk_cfg_update_flag = 0;
	aw87519->rcv_cfg_update_flag = 0;
	aw87519_cfg_init(aw87519);

	/* aw87519 hardware off */
	aw87519_hw_off(aw87519);

	return 0;

exit_i2c_check_id_failed:
	devm_gpio_free(&client->dev, aw87519->reset_gpio);
exit_gpio_request_failed:
exit_gpio_get_failed:
	devm_kfree(&client->dev, aw87519);
	aw87519 = NULL;
exit_devm_kzalloc_failed:
exit_check_functionality_failed:
	return ret;
}

static int aw87519_i2c_remove(struct i2c_client *client)
{
	struct aw87519 *aw87519 = i2c_get_clientdata(client);

	if (gpio_is_valid(aw87519->reset_gpio))
		devm_gpio_free(&client->dev, aw87519->reset_gpio);

	return 0;
}

static const struct i2c_device_id aw87519_i2c_id[] = {
	{AW87519_LEFT_I2C_NAME, 0},
	{}
};

static const struct of_device_id extpa_of_match[] = {
	{.compatible = "awinic,aw87519_left"},
	{},
};

static struct i2c_driver aw87519_i2c_driver = {
	.driver = {
		   .owner = THIS_MODULE,
		   .name = AW87519_LEFT_I2C_NAME,
		   .of_match_table = extpa_of_match,
		   },
	.probe = aw87519_i2c_probe,
	.remove = aw87519_i2c_remove,
	.id_table = aw87519_i2c_id,
};

static int __init aw87519_pa_init(void)
{
	int ret;

	pr_info("%s enter\n", __func__);
	pr_info("%s: left version:%s\n", __func__, AW87519_LEFT_DRIVER_VERSION);

	ret = i2c_add_driver(&aw87519_i2c_driver);
	if (ret) {
		pr_info("[%s] Unable to register driver (%d)\n", __func__, ret);
		return ret;
	}
	return 0;
}

static void __exit aw87519_pa_exit(void)
{
	pr_info("%s enter\n", __func__);
	i2c_del_driver(&aw87519_i2c_driver);
}

module_init(aw87519_pa_init);
module_exit(aw87519_pa_exit);

MODULE_AUTHOR("<zhangzeta@awinic.com.cn>");
MODULE_DESCRIPTION("AWINIC AW87519 PA driver");
MODULE_LICENSE("GPL v2");