/*
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* drivers/char/sunxi-scr/smartcard.c
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*
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* Copyright (C) 2016 Allwinner.
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* fuzhaoke <fuzhaoke@allwinnertech.com>
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*
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* Decode for ISO7816 smart card
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include "smartcard.h"
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void smartcard_ta1_decode(struct smc_atr_para *psmc_atr, uint8_t ta1)
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{
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pr_debug("%s: enter!!\n", __func__);
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switch ((ta1>>4)&0xf) {
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case 0x0:
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psmc_atr->FMAX = 4;
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psmc_atr->F = 372;
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break;
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case 0x1:
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psmc_atr->FMAX = 5;
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psmc_atr->F = 372;
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break;
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case 0x2:
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psmc_atr->FMAX = 6;
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psmc_atr->F = 558;
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break;
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case 0x3:
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psmc_atr->FMAX = 8;
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psmc_atr->F = 744;
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break;
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case 0x4:
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psmc_atr->FMAX = 12;
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psmc_atr->F = 1116;
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break;
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case 0x5:
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psmc_atr->FMAX = 16;
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psmc_atr->F = 1488;
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break;
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case 0x6:
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psmc_atr->FMAX = 20;
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psmc_atr->F = 1860;
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break;
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case 0x9:
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psmc_atr->FMAX = 5;
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psmc_atr->F = 512;
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break;
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case 0xA:
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psmc_atr->FMAX = 7;
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psmc_atr->F = 768;
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break;
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case 0xB:
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psmc_atr->FMAX = 10;
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psmc_atr->F = 1024;
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break;
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case 0xC:
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psmc_atr->FMAX = 15;
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psmc_atr->F = 1536;
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break;
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case 0xD:
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psmc_atr->FMAX = 20;
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psmc_atr->F = 2048;
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break;
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default: /* 0x7/0x8/0xE/0xF */
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psmc_atr->FMAX = 4;
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psmc_atr->F = 372;
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pr_err("Unsupport ta1 = 0x%x\n", ta1);
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break;
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}
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switch (ta1&0xf) {
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case 0x1:
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psmc_atr->D = 1;
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break;
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case 0x2:
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psmc_atr->D = 2;
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break;
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case 0x3:
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psmc_atr->D = 4;
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break;
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case 0x4:
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psmc_atr->D = 8;
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break;
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case 0x5:
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psmc_atr->D = 16;
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break;
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case 0x6:
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psmc_atr->D = 32;
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break;
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case 0x8:
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psmc_atr->D = 12;
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break;
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case 0x9:
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psmc_atr->D = 20;
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break;
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default: /* 0x0/0x7/0xA/0xB/0xC/0xD/0xE/0xF */
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psmc_atr->D = 1;
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pr_err("Unsupport ta1 = 0x%x\n", ta1);
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break;
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}
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}
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void smartcard_tb1_decode(struct smc_atr_para *psmc_atr, uint8_t tb1)
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{
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pr_debug("%s: enter!!\n", __func__);
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switch ((tb1>>5)&0x3) {
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case 0:
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psmc_atr->I = 25;
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break;
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case 1:
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psmc_atr->I = 50;
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break;
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case 2:
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psmc_atr->I = 100;
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break;
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default:
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psmc_atr->I = 50;
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}
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if (((tb1&0x1f) > 4) && ((tb1&0x1f) < 26))
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psmc_atr->P = (tb1&0x1f); /* 5~25 in Volts */
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else if (0 == (tb1&0x1f))
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psmc_atr->P = 0;
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else
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psmc_atr->P = 5;
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}
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/* ATR data format: max 33 byte(include TS)
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* [TS|T0|TA1|TB1|TC1|TD1|TA2|TB2|TC2|TD2|...|T1|T2|........|TK|TCK]
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* |-------- max 16 byte --------------|-- max 15 byte --|verify
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* |--------------------- max 33 byte -------------------------|
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* TS: Initial character
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* 0x3b:direct convention, 0x3f:inverse convention
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* T0: Format character
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* [bit7|bit6|bit5|bit4|bit3|bit2|bit1|bit0]
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* |------- Y1 --------|-------- K --------|
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* Y1: indicator for the presence of the interface character
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* TA1 is transmitted when bit[4] = 1
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* TB1 is transmitted when bit[5] = 1
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* TC1 is transmitted when bit[6] = 1
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* TD1 is transmitted when bit[7] = 1
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* K: history number
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* TAi: Interface character
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* code FI,DI
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* TBi: Interface character
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* code II,PI
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* TCi: Interface character
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* code N
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* TDi: Interface character
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* code Yi+1, T
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* [bit7|bit6|bit5|bit4|bit3|bit2|bit1|bit0]
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* |------ Yi + 1 -----|-------- T --------|
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* Yi + 1: indicator for the presence of the interface character
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* TAi+1 is transmitted when bit[4] = 1
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* TBi+1 is transmitted when bit[5] = 1
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* TCi+1 is transmitted when bit[6] = 1
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* TDi+1 is transmitted when bit[7] = 1
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* T: Protocol type for subsequent transmission
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* T=0: character transmit
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* T=1: block transmit
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* T=other: reserved
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* T1~TK: history byte, information of the card like manufacture name
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* TCK: verify character, make sure the data is correctly
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*/
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void smartcard_atr_decode(struct smc_atr_para *psmc_atr, struct smc_pps_para *psmc_pps,
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uint8_t *pdata, uint8_t with_ts)
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{
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uint8_t index = 0;
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uint8_t temp;
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uint8_t i;
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pr_debug("%s: Enter...\n", __func__);
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psmc_pps->ppss = 0xff;
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psmc_pps->pps0 = 0;
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if (with_ts) {
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psmc_atr->TS = pdata[0]; /* TS */
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index++;
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}
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temp = pdata[index]; /* T0 */
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index++;
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psmc_atr->TK_NUM = temp & 0xf;
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/* TA1 */
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if (temp & 0x10) {
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smartcard_ta1_decode(psmc_atr, pdata[index]);
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psmc_pps->pps0 |= 0x1<<4;
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psmc_pps->pps1 = pdata[index];
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index++;
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}
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/* TB1 */
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if (temp & 0x20) {
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smartcard_tb1_decode(psmc_atr, pdata[index]);
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index++;
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}
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/* TC1 */
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if (temp & 0x40) {
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psmc_atr->N = pdata[index] & 0xff;
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index++;
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}
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/* TD1 */
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if (temp & 0x80) {
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pr_debug("%s: TD1 parse 0x%x !!\n", __func__, pdata[index]);
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temp = pdata[index];
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psmc_atr->T = temp & 0xf;
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psmc_pps->pps0 |= temp & 0xf;
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/* Adjust Guard Time */
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if (psmc_atr->N == 0xff) {
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if (psmc_atr->T == 1)
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psmc_atr->N = 1;
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else
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psmc_atr->N = 2;
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}
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index++;
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} else {
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if (psmc_atr->N == 0xff)
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psmc_atr->N = 2;
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goto rx_tk;
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}
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/* TA2 */
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if (temp & 0x10) {
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pr_debug("TA2 Exist!!\n");
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index++;
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}
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/* TB2 */
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if (temp & 0x20) {
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pr_debug("TB2 Exist!!\n");
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index++;
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}
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/* TC2 */
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if (temp & 0x40) {
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pr_debug("TC2 Exist!!\n");
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index++;
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}
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/* TD2 */
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if (temp & 0x80) {
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pr_debug("TD2 Exist!!\n");
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temp = pdata[index];
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index++;
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} else {
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goto rx_tk;
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}
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/* TA3 */
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if (temp & 0x10) {
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pr_debug("TA3 Exist!!\n");
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index++;
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}
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/* TB3 */
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if (temp & 0x20) {
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pr_debug("TB3 Exist!!\n");
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index++;
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}
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/* TC3 */
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if (temp & 0x40) {
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pr_debug("TC3 Exist!!\n");
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index++;
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}
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/* TD3 */
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if (temp & 0x80) {
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pr_debug("TD3 Exist!!\n");
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temp = pdata[index];
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index++;
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} else {
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goto rx_tk;
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}
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/* TA4 */
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if (temp & 0x10) {
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pr_debug("TA4 Exist!!\n");
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index++;
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}
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/* TB4 */
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if (temp & 0x20) {
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pr_debug("TB4 Exist!!\n");
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index++;
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}
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/* TC4 */
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if (temp & 0x40) {
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pr_debug("TC4 Exist!!\n");
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index++;
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}
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/* TD4 */
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if (temp & 0x80) {
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pr_debug("TD4 Exist!!\n");
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temp = pdata[index];
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index++;
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}
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rx_tk:
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for (i = 0; i < (psmc_atr->TK_NUM); i++)
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psmc_atr->TK[i] = pdata[index++];
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psmc_pps->pck = psmc_pps->ppss;
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psmc_pps->pck ^= psmc_pps->pps0;
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if (psmc_pps->pps0&(0x1<<4))
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psmc_pps->pck ^= psmc_pps->pps1;
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if (psmc_pps->pps0&(0x1<<5))
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psmc_pps->pck ^= psmc_pps->pps2;
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if (psmc_pps->pps0&(0x1<<6))
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psmc_pps->pck ^= psmc_pps->pps3;
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}
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