/*
 * Copyright (C) 2018, SI-IN, Yun Shi (yun.shi@si-in.com).
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 */


#ifndef _SIA81XX_REGMAP_H
#define _SIA81XX_REGMAP_H

#include <linux/regmap.h>

struct sia81xx_reg_vals {
	const char *vals;
	const unsigned int num;
};

struct sia81xx_reg_default_val {
	unsigned int chip_type;
	const unsigned int offset;
	struct sia81xx_reg_vals reg_defaults[AUDIO_SCENE_NUM];
};

struct sia81xx_opt_if {
	int (*check_chip_id)(struct regmap *regmap);
	void (*set_xfilter)(struct regmap *regmap, unsigned int val);
	void (*chip_on)(struct regmap *regmap, unsigned int scene);
	void (*chip_off)(struct regmap *regmap);
	bool (*get_chip_en)(struct regmap *regmap);
	void (*set_pvdd_limit)(struct regmap *regmap, unsigned int vol);
	void (*check_trimming)(struct regmap *regmap);
};

typedef struct __SIA_CHIP_ID_RANGE {
	uint32_t begin;
	uint32_t end;
} SIA_CHIP_ID_RANGE;

typedef struct __SIA_REGS {
	uint8_t addr;
	uint8_t val;
} SIA_REGS;

/******************************************************************************
* Name: CRC-4/ITU x4+x+1
* Poly: 0x03
* Init: 0x00
* Refin: True
* Refout: True
* Xorout: 0x00
* Note:
*****************************************************************************/
static inline uint8_t crc4_itu(uint8_t *data, uint32_t length)
{
	uint8_t i;
	uint8_t crc = 0; // Initial value

	while (length--) {
		crc ^= *data++; // crc ^= *data; data++;
		for (i = 0; i < 8; ++i)	{
			if (crc & 1)
				crc = (crc >> 1) ^ 0x0C;// 0x0C = (reverse 0x03)>>(8-4)
			else
				crc = (crc >> 1);
		}
	}

	return crc;
}

/******************************************************************************
 * Name:    CRC-8/MAXIM         x8+x5+x4+1
 * Poly:    0x31
 * Init:    0x00
 * Refin:   True
 * Refout:  True
 * Xorout:  0x00
 * Alias:   DOW-CRC,CRC-8/IBUTTON
 *****************************************************************************/
static inline uint8_t crc8_maxim(uint8_t *data, uint32_t length)
{
    uint8_t i;
    uint8_t crc = 0;         // Initial value

    while (length--) {
        crc ^= *data++;        // crc ^= *data; data++;
        for (i = 0; i < 8; i++) {
            if (crc & 1)
                crc = (crc >> 1) ^ 0x8C;        // 0x8C = reverse 0x31
            else
                crc >>= 1;
        }
    }

    return crc;
}

int sia81xx_regmap_read(struct regmap *regmap, 
	unsigned int start_reg, unsigned int reg_num, char *buf);
int sia81xx_regmap_write(struct regmap *regmap, 
	unsigned int start_reg, unsigned int reg_num, const char *buf);
void sia81xx_regmap_defaults(struct regmap *regmap, 
	unsigned int chip_type, unsigned int scene, unsigned int channel_num);
struct regmap *sia81xx_regmap_init(struct i2c_client *client, 
	unsigned int chip_type);
void sia81xx_regmap_remove(struct regmap *regmap);


/* option interface function */
int sia81xx_regmap_check_chip_id(struct regmap *regmap, 
	unsigned int chip_type);
void sia81xx_regmap_set_xfilter(struct regmap *regmap, 
	unsigned int chip_type, unsigned int val);
void sia81xx_regmap_set_chip_on(struct regmap *regmap, 
	unsigned int chip_type, unsigned int scene);
void sia81xx_regmap_set_chip_off(struct regmap *regmap, 
	unsigned int chip_type);
bool sia81xx_regmap_get_chip_en(struct regmap *regmap, 
	unsigned int chip_type);
void sia81xx_regmap_set_pvdd_limit(struct regmap *regmap, 
	unsigned int chip_type, unsigned int vol);
void sia81xx_regmap_check_trimming(struct regmap *regmap, 
	unsigned int chip_type);

#endif /* _SIA81XX_REGMAP_H */