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/*
* 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);
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 */
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;
if (dest == NULL) {
temp_buf = kcalloc(size, sizeof(s16), GFP_KERNEL);
if (!temp_buf) {
ts_err("malloc failed");
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);
}
}
/* 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");
}
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;
}
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