// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*/
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/sched/types.h>
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#include <media/cec-pin.h>
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#include "cec-pin-priv.h"
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struct cec_error_inj_cmd {
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unsigned int mode_offset;
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int arg_idx;
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const char *cmd;
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};
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static const struct cec_error_inj_cmd cec_error_inj_cmds[] = {
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{ CEC_ERROR_INJ_RX_NACK_OFFSET, -1, "rx-nack" },
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{ CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET,
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CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX, "rx-low-drive" },
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{ CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET, -1, "rx-add-byte" },
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{ CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET, -1, "rx-remove-byte" },
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{ CEC_ERROR_INJ_RX_ARB_LOST_OFFSET,
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CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX, "rx-arb-lost" },
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{ CEC_ERROR_INJ_TX_NO_EOM_OFFSET, -1, "tx-no-eom" },
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{ CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET, -1, "tx-early-eom" },
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{ CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET,
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CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX, "tx-add-bytes" },
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{ CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET, -1, "tx-remove-byte" },
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{ CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET,
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CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX, "tx-short-bit" },
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{ CEC_ERROR_INJ_TX_LONG_BIT_OFFSET,
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CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX, "tx-long-bit" },
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{ CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET,
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CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX, "tx-custom-bit" },
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{ CEC_ERROR_INJ_TX_SHORT_START_OFFSET, -1, "tx-short-start" },
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{ CEC_ERROR_INJ_TX_LONG_START_OFFSET, -1, "tx-long-start" },
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{ CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET, -1, "tx-custom-start" },
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{ CEC_ERROR_INJ_TX_LAST_BIT_OFFSET,
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CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX, "tx-last-bit" },
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{ CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET,
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CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX, "tx-low-drive" },
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{ 0, -1, NULL }
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};
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u16 cec_pin_rx_error_inj(struct cec_pin *pin)
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{
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u16 cmd = CEC_ERROR_INJ_OP_ANY;
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/* Only when 18 bits have been received do we have a valid cmd */
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if (!(pin->error_inj[cmd] & CEC_ERROR_INJ_RX_MASK) &&
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pin->rx_bit >= 18)
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cmd = pin->rx_msg.msg[1];
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return (pin->error_inj[cmd] & CEC_ERROR_INJ_RX_MASK) ? cmd :
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CEC_ERROR_INJ_OP_ANY;
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}
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u16 cec_pin_tx_error_inj(struct cec_pin *pin)
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{
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u16 cmd = CEC_ERROR_INJ_OP_ANY;
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if (!(pin->error_inj[cmd] & CEC_ERROR_INJ_TX_MASK) &&
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pin->tx_msg.len > 1)
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cmd = pin->tx_msg.msg[1];
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return (pin->error_inj[cmd] & CEC_ERROR_INJ_TX_MASK) ? cmd :
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CEC_ERROR_INJ_OP_ANY;
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}
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bool cec_pin_error_inj_parse_line(struct cec_adapter *adap, char *line)
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{
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static const char *delims = " \t\r";
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struct cec_pin *pin = adap->pin;
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unsigned int i;
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bool has_pos = false;
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char *p = line;
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char *token;
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char *comma;
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u64 *error;
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u8 *args;
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bool has_op;
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u8 op;
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u8 mode;
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u8 pos;
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p = skip_spaces(p);
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token = strsep(&p, delims);
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if (!strcmp(token, "clear")) {
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memset(pin->error_inj, 0, sizeof(pin->error_inj));
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pin->rx_toggle = pin->tx_toggle = false;
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pin->tx_ignore_nack_until_eom = false;
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pin->tx_custom_pulse = false;
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pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
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pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
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return true;
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}
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if (!strcmp(token, "rx-clear")) {
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for (i = 0; i <= CEC_ERROR_INJ_OP_ANY; i++)
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pin->error_inj[i] &= ~CEC_ERROR_INJ_RX_MASK;
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pin->rx_toggle = false;
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return true;
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}
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if (!strcmp(token, "tx-clear")) {
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for (i = 0; i <= CEC_ERROR_INJ_OP_ANY; i++)
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pin->error_inj[i] &= ~CEC_ERROR_INJ_TX_MASK;
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pin->tx_toggle = false;
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pin->tx_ignore_nack_until_eom = false;
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pin->tx_custom_pulse = false;
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pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
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pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
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return true;
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}
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if (!strcmp(token, "tx-ignore-nack-until-eom")) {
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pin->tx_ignore_nack_until_eom = true;
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return true;
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}
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if (!strcmp(token, "tx-custom-pulse")) {
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pin->tx_custom_pulse = true;
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cec_pin_start_timer(pin);
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return true;
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}
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if (!p)
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return false;
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p = skip_spaces(p);
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if (!strcmp(token, "tx-custom-low-usecs")) {
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u32 usecs;
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if (kstrtou32(p, 0, &usecs) || usecs > 10000000)
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return false;
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pin->tx_custom_low_usecs = usecs;
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return true;
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}
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if (!strcmp(token, "tx-custom-high-usecs")) {
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u32 usecs;
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if (kstrtou32(p, 0, &usecs) || usecs > 10000000)
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return false;
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pin->tx_custom_high_usecs = usecs;
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return true;
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}
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comma = strchr(token, ',');
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if (comma)
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*comma++ = '\0';
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if (!strcmp(token, "any")) {
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has_op = false;
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error = pin->error_inj + CEC_ERROR_INJ_OP_ANY;
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args = pin->error_inj_args[CEC_ERROR_INJ_OP_ANY];
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} else if (!kstrtou8(token, 0, &op)) {
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has_op = true;
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error = pin->error_inj + op;
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args = pin->error_inj_args[op];
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} else {
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return false;
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}
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mode = CEC_ERROR_INJ_MODE_ONCE;
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if (comma) {
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if (!strcmp(comma, "off"))
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mode = CEC_ERROR_INJ_MODE_OFF;
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else if (!strcmp(comma, "once"))
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mode = CEC_ERROR_INJ_MODE_ONCE;
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else if (!strcmp(comma, "always"))
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mode = CEC_ERROR_INJ_MODE_ALWAYS;
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else if (!strcmp(comma, "toggle"))
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mode = CEC_ERROR_INJ_MODE_TOGGLE;
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else
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return false;
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}
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token = strsep(&p, delims);
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if (p) {
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p = skip_spaces(p);
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has_pos = !kstrtou8(p, 0, &pos);
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}
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if (!strcmp(token, "clear")) {
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*error = 0;
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return true;
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}
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if (!strcmp(token, "rx-clear")) {
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*error &= ~CEC_ERROR_INJ_RX_MASK;
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return true;
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}
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if (!strcmp(token, "tx-clear")) {
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*error &= ~CEC_ERROR_INJ_TX_MASK;
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return true;
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}
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for (i = 0; cec_error_inj_cmds[i].cmd; i++) {
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const char *cmd = cec_error_inj_cmds[i].cmd;
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unsigned int mode_offset;
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u64 mode_mask;
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int arg_idx;
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bool is_bit_pos = true;
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if (strcmp(token, cmd))
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continue;
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mode_offset = cec_error_inj_cmds[i].mode_offset;
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mode_mask = CEC_ERROR_INJ_MODE_MASK << mode_offset;
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arg_idx = cec_error_inj_cmds[i].arg_idx;
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if (mode_offset == CEC_ERROR_INJ_RX_ARB_LOST_OFFSET) {
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if (has_op)
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return false;
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if (!has_pos)
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pos = 0x0f;
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is_bit_pos = false;
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} else if (mode_offset == CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET) {
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if (!has_pos || !pos)
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return false;
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is_bit_pos = false;
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}
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if (arg_idx >= 0 && is_bit_pos) {
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if (!has_pos || pos >= 160)
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return false;
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if (has_op && pos < 10 + 8)
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return false;
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/* Invalid bit position may not be the Ack bit */
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if ((mode_offset == CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET ||
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mode_offset == CEC_ERROR_INJ_TX_LONG_BIT_OFFSET ||
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mode_offset == CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET) &&
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(pos % 10) == 9)
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return false;
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}
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*error &= ~mode_mask;
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*error |= (u64)mode << mode_offset;
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if (arg_idx >= 0)
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args[arg_idx] = pos;
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return true;
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}
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return false;
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}
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static void cec_pin_show_cmd(struct seq_file *sf, u32 cmd, u8 mode)
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{
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if (cmd == CEC_ERROR_INJ_OP_ANY)
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seq_puts(sf, "any,");
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else
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seq_printf(sf, "0x%02x,", cmd);
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switch (mode) {
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case CEC_ERROR_INJ_MODE_ONCE:
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seq_puts(sf, "once ");
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break;
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case CEC_ERROR_INJ_MODE_ALWAYS:
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seq_puts(sf, "always ");
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break;
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case CEC_ERROR_INJ_MODE_TOGGLE:
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seq_puts(sf, "toggle ");
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break;
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default:
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seq_puts(sf, "off ");
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break;
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}
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}
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int cec_pin_error_inj_show(struct cec_adapter *adap, struct seq_file *sf)
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{
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struct cec_pin *pin = adap->pin;
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unsigned int i, j;
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seq_puts(sf, "# Clear error injections:\n");
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seq_puts(sf, "# clear clear all rx and tx error injections\n");
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seq_puts(sf, "# rx-clear clear all rx error injections\n");
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seq_puts(sf, "# tx-clear clear all tx error injections\n");
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seq_puts(sf, "# <op> clear clear all rx and tx error injections for <op>\n");
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seq_puts(sf, "# <op> rx-clear clear all rx error injections for <op>\n");
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seq_puts(sf, "# <op> tx-clear clear all tx error injections for <op>\n");
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seq_puts(sf, "#\n");
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seq_puts(sf, "# RX error injection:\n");
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seq_puts(sf, "# <op>[,<mode>] rx-nack NACK the message instead of sending an ACK\n");
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seq_puts(sf, "# <op>[,<mode>] rx-low-drive <bit> force a low-drive condition at this bit position\n");
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seq_puts(sf, "# <op>[,<mode>] rx-add-byte add a spurious byte to the received CEC message\n");
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seq_puts(sf, "# <op>[,<mode>] rx-remove-byte remove the last byte from the received CEC message\n");
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seq_puts(sf, "# <op>[,<mode>] rx-arb-lost <poll> generate a POLL message to trigger an arbitration lost\n");
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seq_puts(sf, "#\n");
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seq_puts(sf, "# TX error injection settings:\n");
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seq_puts(sf, "# tx-ignore-nack-until-eom ignore early NACKs until EOM\n");
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seq_puts(sf, "# tx-custom-low-usecs <usecs> define the 'low' time for the custom pulse\n");
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seq_puts(sf, "# tx-custom-high-usecs <usecs> define the 'high' time for the custom pulse\n");
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seq_puts(sf, "# tx-custom-pulse transmit the custom pulse once the bus is idle\n");
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seq_puts(sf, "#\n");
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seq_puts(sf, "# TX error injection:\n");
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seq_puts(sf, "# <op>[,<mode>] tx-no-eom don't set the EOM bit\n");
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seq_puts(sf, "# <op>[,<mode>] tx-early-eom set the EOM bit one byte too soon\n");
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seq_puts(sf, "# <op>[,<mode>] tx-add-bytes <num> append <num> (1-255) spurious bytes to the message\n");
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seq_puts(sf, "# <op>[,<mode>] tx-remove-byte drop the last byte from the message\n");
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seq_puts(sf, "# <op>[,<mode>] tx-short-bit <bit> make this bit shorter than allowed\n");
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seq_puts(sf, "# <op>[,<mode>] tx-long-bit <bit> make this bit longer than allowed\n");
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seq_puts(sf, "# <op>[,<mode>] tx-custom-bit <bit> send the custom pulse instead of this bit\n");
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seq_puts(sf, "# <op>[,<mode>] tx-short-start send a start pulse that's too short\n");
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seq_puts(sf, "# <op>[,<mode>] tx-long-start send a start pulse that's too long\n");
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seq_puts(sf, "# <op>[,<mode>] tx-custom-start send the custom pulse instead of the start pulse\n");
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seq_puts(sf, "# <op>[,<mode>] tx-last-bit <bit> stop sending after this bit\n");
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seq_puts(sf, "# <op>[,<mode>] tx-low-drive <bit> force a low-drive condition at this bit position\n");
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seq_puts(sf, "#\n");
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seq_puts(sf, "# <op> CEC message opcode (0-255) or 'any'\n");
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seq_puts(sf, "# <mode> 'once' (default), 'always', 'toggle' or 'off'\n");
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seq_puts(sf, "# <bit> CEC message bit (0-159)\n");
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seq_puts(sf, "# 10 bits per 'byte': bits 0-7: data, bit 8: EOM, bit 9: ACK\n");
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seq_puts(sf, "# <poll> CEC poll message used to test arbitration lost (0x00-0xff, default 0x0f)\n");
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seq_puts(sf, "# <usecs> microseconds (0-10000000, default 1000)\n");
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seq_puts(sf, "\nclear\n");
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for (i = 0; i < ARRAY_SIZE(pin->error_inj); i++) {
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u64 e = pin->error_inj[i];
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for (j = 0; cec_error_inj_cmds[j].cmd; j++) {
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const char *cmd = cec_error_inj_cmds[j].cmd;
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unsigned int mode;
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unsigned int mode_offset;
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int arg_idx;
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mode_offset = cec_error_inj_cmds[j].mode_offset;
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arg_idx = cec_error_inj_cmds[j].arg_idx;
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mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
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if (!mode)
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continue;
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cec_pin_show_cmd(sf, i, mode);
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seq_puts(sf, cmd);
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if (arg_idx >= 0)
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seq_printf(sf, " %u",
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pin->error_inj_args[i][arg_idx]);
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seq_puts(sf, "\n");
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}
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}
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if (pin->tx_ignore_nack_until_eom)
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seq_puts(sf, "tx-ignore-nack-until-eom\n");
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if (pin->tx_custom_pulse)
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seq_puts(sf, "tx-custom-pulse\n");
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if (pin->tx_custom_low_usecs != CEC_TIM_CUSTOM_DEFAULT)
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seq_printf(sf, "tx-custom-low-usecs %u\n",
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pin->tx_custom_low_usecs);
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if (pin->tx_custom_high_usecs != CEC_TIM_CUSTOM_DEFAULT)
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seq_printf(sf, "tx-custom-high-usecs %u\n",
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pin->tx_custom_high_usecs);
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return 0;
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}
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