/*
** =============================================================================
** Copyright (c) 2017  Texas Instruments Inc.
**
** 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; version 2.
**
** 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.
**
** File:
**     tas25xx-calib.c
**
** Description:
**     misc driver for interfacing for  Texas Instruments TAS2560 algorithm
**
** =============================================================================
*/

#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/device.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/semaphore.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <sound/smart_amp.h>

/* Holds the Packet data required for processing */
struct tas_dsp_pkt {
	u8 slave_id;
	u8 book;
	u8 page;
	u8 offset;
	u8 data[TAS_PAYLOAD_SIZE * 4];
};

static int smartamp_params_ctrl(uint8_t *input, u8 dir, u8 count)
{
	u32 length = count / 4;
	u32 paramid = 0;
	u32 index;
	int ret = 0;
	int special_index = 0;
	struct tas_dsp_pkt *ppacket;

	ppacket = (struct tas_dsp_pkt*)kmalloc (sizeof(struct tas_dsp_pkt), GFP_KERNEL);
	if (!ppacket) {
		pr_err ("[TI-SmartPA:%s] pperror kmalloc failed!", __func__);
		return -ENOMEM;
	}

	memset(ppacket, 0, sizeof(struct tas_dsp_pkt));
	ret = copy_from_user (ppacket, input, sizeof(struct tas_dsp_pkt));
	if (ret){
		pr_err("[TI-SmartPA:%s] Error copying from user\n", __func__);
		kfree (ppacket);
		return -EFAULT;
	}

	index = (ppacket->page - 1) * 30 + (ppacket->offset - 8) / 4;
	special_index = TAS_SA_IS_SPL_IDX(index);
	pr_info("[TI-SmartPA:%s] index = %d", __func__, index);
	if (special_index == 0) {
		if (index > MAX_DSP_PARAM_INDEX) {
			pr_err("[TI-SmartPA:%s] invalid index !\n", __func__);
			kfree(ppacket);
			return -1;
		}
	}
	pr_info("[TI-SmartPA:%s] Valid Index. special = %s\n", __func__, special_index ? "Yes" : "No");

	/* speakers are differentiated by slave ids */
	if (ppacket->slave_id == SLAVE1 )
	{
		paramid = (paramid | (index ) | (length << 16) | (1 << 24));
		pr_info("[TI-SmartPA:%s] Rcvd Slave id for slave 1, %x\n", __func__, ppacket->slave_id);
	}else if (ppacket->slave_id == SLAVE2 )
	{
		paramid = (paramid | (index ) | (length << 16) | (2 << 24));
		pr_info("[TI-SmartPA:%s] Rcvd Slave id for slave 2, %x\n", __func__, ppacket->slave_id);
	}else{
		pr_err("[TI-SmartPA:%s] Wrong slaveid = %x\n", __func__, ppacket->slave_id);
	}

	ret = afe_smartamp_algo_ctrl(ppacket->data, paramid,
			dir, length * 4);
	if (ret)
		pr_err("[TI-SmartPA:%s] %s Slave 0x%x params failed from afe, ret=%x\n", __func__, 
				dir == TAS_GET_PARAM ? "get" : "set", ppacket->slave_id, ret);
	else
		pr_info("[TI-SmartPA:%s] Algo control returned %d\n", __func__, ret);

	if (dir == TAS_GET_PARAM) {
		ret = copy_to_user(input, ppacket, sizeof(struct tas_dsp_pkt));
		if (ret) {
			pr_err("[TI-SmartPA:%s] Error copying to user after DSP", __func__);
			ret = -EFAULT;
		}
	}

	kfree(ppacket);
	return ret;
}

static int tas_calib_open(struct inode *inode, struct file *fd)
{
	return 0;
}

static ssize_t tas_calib_write(struct file *file,
		const char __user *buffer, size_t count, loff_t *offp)
{
	int rc = 0;
	rc = smartamp_params_ctrl((uint8_t *)buffer, TAS_SET_PARAM, count);
	return rc;
}

static ssize_t tas_calib_read(struct file *file, char __user *buffer,
		size_t count, loff_t *ptr)
{
	int rc;
	rc = smartamp_params_ctrl((uint8_t *)buffer, TAS_GET_PARAM, count);
	if (rc < 0)
		count = rc;
	return count;
}

static long tas_calib_ioctl(struct file *filp, uint cmd, ulong arg)
{
	return 0;
}

static int tas_calib_release(struct inode *inode, struct file *fd)
{
	return 0;
}

const struct file_operations tas_calib_fops = {
	.owner			= THIS_MODULE,
	.open			= tas_calib_open,
	.write			= tas_calib_write,
	.read			= tas_calib_read,
	.release		= tas_calib_release,
	.unlocked_ioctl	= tas_calib_ioctl,
};

static struct miscdevice tas_calib_misc = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "tas_calib",
	.fops = &tas_calib_fops,
};

int tas_calib_init(void)
{
	int rc;
	pr_err("[TI-SmartPA:%s]",__func__);
	rc = misc_register(&tas_calib_misc);
	if (rc)
		pr_err("[TI-SmartPA:%s] register calib misc failed\n", __func__);
	return rc;
}

void tas_calib_exit(void)
{
	misc_deregister(&tas_calib_misc);
}

MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("TAS25XX Misc driver");
MODULE_LICENSE("GPL v2");