goodix_ts_utils.c

/*
 * Goodix Touchscreen Driver
 * Copyright (C) 2020 - 2021 Goodix, 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be a reference
 * to you, when you are integrating the GOODiX's CTP IC into your system,
 * 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 "goodix_ts_core.h"

bool debug_log_flag = false;

/*****************************************************************************
 * goodix_append_checksum
 * @summary
 *    Calculate data checksum with the specified mode.
 *
 * @param data
 *   data need to be calculate
 * @param len
 *   data length
 * @param mode
 *   calculate for u8 or u16 checksum
 * @return
 *   return the data checksum value.
 *
 *****************************************************************************/
u32 goodix_append_checksum(u8 *data, int len, int mode)
{
	u32 checksum = 0;
	int i;

	checksum = 0;
	if (mode == CHECKSUM_MODE_U8_LE) {
		for (i = 0; i < len; i++)
			checksum += data[i];
	} else {
		for (i = 0; i < len; i += 2)
			checksum += (data[i] + (data[i + 1] << 8));
	}

	if (mode == CHECKSUM_MODE_U8_LE) {
		data[len] = checksum & 0xff;
		data[len + 1] = (checksum >> 8) & 0xff;
		return 0xFFFF & checksum;
	}
	data[len] = checksum & 0xff;
	data[len + 1] = (checksum >> 8) & 0xff;
	data[len + 2] = (checksum >> 16) & 0xff;
	data[len + 3] = (checksum >> 24) & 0xff;
	return checksum;
}

/* checksum_cmp: check data valid or not
 * @data: data need to be check
 * @size: data length need to be check(include the checksum bytes)
 * @mode: compare with U8 or U16 mode
 */
int checksum_cmp(const u8 *data, int size, int mode)
{
	u32 cal_checksum = 0;
	u32 r_checksum = 0;
	u32 i;
	bool is_valid = !is_risk_data(data, size); /* [GOOG] */

	if (mode == CHECKSUM_MODE_U8_LE) {
		if (size < 2)
			return 1;
		for (i = 0; i < size - 2; i++)
			cal_checksum += data[i];
		cal_checksum &= 0xFFFF;
		r_checksum = data[size - 2] + (data[size - 1] << 8);
		return cal_checksum == r_checksum && is_valid ? 0 : 1;
	}

	if (size < 4)
		return 1;
	for (i = 0; i < size - 4; i += 2)
		cal_checksum += data[i] + (data[i + 1] << 8);
	r_checksum = data[size - 4] + (data[size - 3] << 8) +
		     (data[size - 2] << 16) + (data[size - 1] << 24);
	return cal_checksum == r_checksum && is_valid ? 0 : 1;
}

/* return 1 if all data is zero or ff
 * else return 0
 */
int is_risk_data(const u8 *data, int size)
{
	int i;
	int zero_count = 0;
	int ff_count = 0;

	for (i = 0; i < size; i++) {
		if (data[i] == 0)
			zero_count++;
		else if (data[i] == 0xFF)
			ff_count++;
	}
	if (zero_count == size || ff_count == size) {
		ts_info("warning data is all %s\n",
			zero_count == size ? "0x00" : "0xFF");
		return 1;
	}

	return 0;
}

/* get config id form config file */
#define CONFIG_ID_OFFSET 30
u32 goodix_get_file_config_id(u8 *ic_config)
{
	if (!ic_config)
		return 0;
	return le32_to_cpup((__le32 *)&ic_config[CONFIG_ID_OFFSET]);
}

/*
 * matrix transpose:
 * [GOOG]
 * Add 'dest' as optional target(pa/2221748).
 */
void goodix_rotate_abcd2cbad(int tx, int rx, s16 *src, s16 *dest)
{
	s16 *temp_buf = dest;
	int size = tx * rx;
	int x;
	s16 *curr;
	int index_org = 0;

	/*
	 * [GOOG]
	 * If no 'dest' assign, 'src' will be overwrote.
	 */
	if (dest == NULL) {
		temp_buf = kcalloc(size, sizeof(s16), GFP_KERNEL);
		if (!temp_buf) {
			ts_err("%s: malloc failed!\n", __func__);
			return;
		}
	}

	curr = temp_buf;
	for (x = 0; x < rx; x++) {
		for (index_org = x; index_org < size; index_org += rx) {
			*curr = src[index_org];
			curr++;
		}
	}

	if (dest == NULL) {
		memcpy(src, temp_buf, size * sizeof(s16));
		kfree(temp_buf);
	}
	/*~[GOOG] */
}

/* get ic type */
int goodix_get_ic_type(
	struct device_node *node, struct goodix_bus_interface *bus_inf)
{
	const struct property *prop;
	char ic_name[128] = { 0 };
	int i;

	prop = of_find_property(node, "compatible", NULL);
	if (!prop || !prop->value || prop->length > sizeof(ic_name)) {
		ts_err("invalid compatible property");
		return -EINVAL;
	}

	memcpy(ic_name, prop->value, prop->length);

	/* replace string end flag with ';' */
	for (i = 0; i < prop->length - 1; i++)
		if (ic_name[i] == 0)
			ic_name[i] = ';';

	ts_info("ic_name %s", ic_name);

	if (strstr(ic_name, "brl-a")) {
		ts_info("ic type is brl-a");
		bus_inf->ic_type = IC_TYPE_BERLIN_A;
		return 0;
	}

	if (strstr(ic_name, "brl-b")) {
		ts_info("ic type is brl-b");
		bus_inf->ic_type = IC_TYPE_BERLIN_B;
		if (strstr(ic_name, "ga687x")) {
			bus_inf->sub_ic_type = IC_TYPE_SUB_B2;
			ts_info("sub ic type is brl-b2");
		} else if (strstr(ic_name, "gt7986")) {
			bus_inf->sub_ic_type = IC_TYPE_SUB_GT7986;
			ts_info("sub ic type is GT7986");
		}
		return 0;
	}
	if (strstr(ic_name, "brl-d")) {
		ts_info("ic type is brl-d");
		bus_inf->ic_type = IC_TYPE_BERLIN_D;
		return 0;
	}
	if (strstr(ic_name, "nottingham")) {
		ts_info("ic type is nottingham");
		bus_inf->ic_type = IC_TYPE_NOTTINGHAM;
		return 0;
	}

	ts_err("unsupported ic type %s", ic_name);
	return -EINVAL;
}