diff options
Diffstat (limited to 'drivers/media/cec/cec-pin.c')
| -rw-r--r-- | drivers/media/cec/cec-pin.c | 678 |
1 files changed, 591 insertions, 87 deletions
diff --git a/drivers/media/cec/cec-pin.c b/drivers/media/cec/cec-pin.c index b48dfe844118..2a5df99735fa 100644 --- a/drivers/media/cec/cec-pin.c +++ b/drivers/media/cec/cec-pin.c @@ -1,18 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved. - * - * This program is free software; you may redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS - * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN - * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. */ #include <linux/delay.h> @@ -51,11 +39,29 @@ #define CEC_TIM_IDLE_SAMPLE 1000 /* when processing the start bit, sample twice per millisecond */ #define CEC_TIM_START_BIT_SAMPLE 500 -/* when polling for a state change, sample once every 50 micoseconds */ +/* when polling for a state change, sample once every 50 microseconds */ #define CEC_TIM_SAMPLE 50 #define CEC_TIM_LOW_DRIVE_ERROR (1.5 * CEC_TIM_DATA_BIT_TOTAL) +/* + * Total data bit time that is too short/long for a valid bit, + * used for error injection. + */ +#define CEC_TIM_DATA_BIT_TOTAL_SHORT 1800 +#define CEC_TIM_DATA_BIT_TOTAL_LONG 2900 + +/* + * Total start bit time that is too short/long for a valid bit, + * used for error injection. + */ +#define CEC_TIM_START_BIT_TOTAL_SHORT 4100 +#define CEC_TIM_START_BIT_TOTAL_LONG 5000 + +/* Data bits are 0-7, EOM is bit 8 and ACK is bit 9 */ +#define EOM_BIT 8 +#define ACK_BIT 9 + struct cec_state { const char * const name; unsigned int usecs; @@ -68,17 +74,32 @@ static const struct cec_state states[CEC_PIN_STATES] = { { "Tx Wait for High", CEC_TIM_IDLE_SAMPLE }, { "Tx Start Bit Low", CEC_TIM_START_BIT_LOW }, { "Tx Start Bit High", CEC_TIM_START_BIT_TOTAL - CEC_TIM_START_BIT_LOW }, + { "Tx Start Bit High Short", CEC_TIM_START_BIT_TOTAL_SHORT - CEC_TIM_START_BIT_LOW }, + { "Tx Start Bit High Long", CEC_TIM_START_BIT_TOTAL_LONG - CEC_TIM_START_BIT_LOW }, + { "Tx Start Bit Low Custom", 0 }, + { "Tx Start Bit High Custom", 0 }, { "Tx Data 0 Low", CEC_TIM_DATA_BIT_0_LOW }, { "Tx Data 0 High", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_0_LOW }, + { "Tx Data 0 High Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_0_LOW }, + { "Tx Data 0 High Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_0_LOW }, { "Tx Data 1 Low", CEC_TIM_DATA_BIT_1_LOW }, { "Tx Data 1 High", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_1_LOW }, - { "Tx Data 1 Pre Sample", CEC_TIM_DATA_BIT_SAMPLE - CEC_TIM_DATA_BIT_1_LOW }, - { "Tx Data 1 Post Sample", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_SAMPLE }, + { "Tx Data 1 High Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_1_LOW }, + { "Tx Data 1 High Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_1_LOW }, + { "Tx Data 1 High Pre Sample", CEC_TIM_DATA_BIT_SAMPLE - CEC_TIM_DATA_BIT_1_LOW }, + { "Tx Data 1 High Post Sample", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_SAMPLE }, + { "Tx Data 1 High Post Sample Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_SAMPLE }, + { "Tx Data 1 High Post Sample Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_SAMPLE }, + { "Tx Data Bit Low Custom", 0 }, + { "Tx Data Bit High Custom", 0 }, + { "Tx Pulse Low Custom", 0 }, + { "Tx Pulse High Custom", 0 }, + { "Tx Low Drive", CEC_TIM_LOW_DRIVE_ERROR }, { "Rx Start Bit Low", CEC_TIM_SAMPLE }, { "Rx Start Bit High", CEC_TIM_SAMPLE }, { "Rx Data Sample", CEC_TIM_DATA_BIT_SAMPLE }, { "Rx Data Post Sample", CEC_TIM_DATA_BIT_HIGH - CEC_TIM_DATA_BIT_SAMPLE }, - { "Rx Data High", CEC_TIM_SAMPLE }, + { "Rx Data Wait for Low", CEC_TIM_SAMPLE }, { "Rx Ack Low", CEC_TIM_DATA_BIT_0_LOW }, { "Rx Ack Low Post", CEC_TIM_DATA_BIT_HIGH - CEC_TIM_DATA_BIT_0_LOW }, { "Rx Ack High Post", CEC_TIM_DATA_BIT_HIGH }, @@ -93,12 +114,21 @@ static void cec_pin_update(struct cec_pin *pin, bool v, bool force) return; pin->adap->cec_pin_is_high = v; - if (atomic_read(&pin->work_pin_events) < CEC_NUM_PIN_EVENTS) { - pin->work_pin_is_high[pin->work_pin_events_wr] = v; + if (atomic_read(&pin->work_pin_num_events) < CEC_NUM_PIN_EVENTS) { + u8 ev = v; + + if (pin->work_pin_events_dropped) { + pin->work_pin_events_dropped = false; + v |= CEC_PIN_EVENT_FL_DROPPED; + } + pin->work_pin_events[pin->work_pin_events_wr] = ev; pin->work_pin_ts[pin->work_pin_events_wr] = ktime_get(); pin->work_pin_events_wr = (pin->work_pin_events_wr + 1) % CEC_NUM_PIN_EVENTS; - atomic_inc(&pin->work_pin_events); + atomic_inc(&pin->work_pin_num_events); + } else { + pin->work_pin_events_dropped = true; + pin->work_pin_events_dropped_cnt++; } wake_up_interruptible(&pin->kthread_waitq); } @@ -123,6 +153,173 @@ static bool cec_pin_high(struct cec_pin *pin) return cec_pin_read(pin); } +static bool rx_error_inj(struct cec_pin *pin, unsigned int mode_offset, + int arg_idx, u8 *arg) +{ +#ifdef CONFIG_CEC_PIN_ERROR_INJ + u16 cmd = cec_pin_rx_error_inj(pin); + u64 e = pin->error_inj[cmd]; + unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK; + + if (arg_idx >= 0) { + u8 pos = pin->error_inj_args[cmd][arg_idx]; + + if (arg) + *arg = pos; + else if (pos != pin->rx_bit) + return false; + } + + switch (mode) { + case CEC_ERROR_INJ_MODE_ONCE: + pin->error_inj[cmd] &= + ~(CEC_ERROR_INJ_MODE_MASK << mode_offset); + return true; + case CEC_ERROR_INJ_MODE_ALWAYS: + return true; + case CEC_ERROR_INJ_MODE_TOGGLE: + return pin->rx_toggle; + default: + return false; + } +#else + return false; +#endif +} + +static bool rx_nack(struct cec_pin *pin) +{ + return rx_error_inj(pin, CEC_ERROR_INJ_RX_NACK_OFFSET, -1, NULL); +} + +static bool rx_low_drive(struct cec_pin *pin) +{ + return rx_error_inj(pin, CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET, + CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX, NULL); +} + +static bool rx_add_byte(struct cec_pin *pin) +{ + return rx_error_inj(pin, CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET, -1, NULL); +} + +static bool rx_remove_byte(struct cec_pin *pin) +{ + return rx_error_inj(pin, CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET, -1, NULL); +} + +static bool rx_arb_lost(struct cec_pin *pin, u8 *poll) +{ + return pin->tx_msg.len == 0 && + rx_error_inj(pin, CEC_ERROR_INJ_RX_ARB_LOST_OFFSET, + CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX, poll); +} + +static bool tx_error_inj(struct cec_pin *pin, unsigned int mode_offset, + int arg_idx, u8 *arg) +{ +#ifdef CONFIG_CEC_PIN_ERROR_INJ + u16 cmd = cec_pin_tx_error_inj(pin); + u64 e = pin->error_inj[cmd]; + unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK; + + if (arg_idx >= 0) { + u8 pos = pin->error_inj_args[cmd][arg_idx]; + + if (arg) + *arg = pos; + else if (pos != pin->tx_bit) + return false; + } + + switch (mode) { + case CEC_ERROR_INJ_MODE_ONCE: + pin->error_inj[cmd] &= + ~(CEC_ERROR_INJ_MODE_MASK << mode_offset); + return true; + case CEC_ERROR_INJ_MODE_ALWAYS: + return true; + case CEC_ERROR_INJ_MODE_TOGGLE: + return pin->tx_toggle; + default: + return false; + } +#else + return false; +#endif +} + +static bool tx_no_eom(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_NO_EOM_OFFSET, -1, NULL); +} + +static bool tx_early_eom(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET, -1, NULL); +} + +static bool tx_short_bit(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET, + CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX, NULL); +} + +static bool tx_long_bit(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_LONG_BIT_OFFSET, + CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX, NULL); +} + +static bool tx_custom_bit(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET, + CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX, NULL); +} + +static bool tx_short_start(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_SHORT_START_OFFSET, -1, NULL); +} + +static bool tx_long_start(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_LONG_START_OFFSET, -1, NULL); +} + +static bool tx_custom_start(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET, + -1, NULL); +} + +static bool tx_last_bit(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_LAST_BIT_OFFSET, + CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX, NULL); +} + +static u8 tx_add_bytes(struct cec_pin *pin) +{ + u8 bytes; + + if (tx_error_inj(pin, CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET, + CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX, &bytes)) + return bytes; + return 0; +} + +static bool tx_remove_byte(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET, -1, NULL); +} + +static bool tx_low_drive(struct cec_pin *pin) +{ + return tx_error_inj(pin, CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET, + CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX, NULL); +} + static void cec_pin_to_idle(struct cec_pin *pin) { /* @@ -132,8 +329,16 @@ static void cec_pin_to_idle(struct cec_pin *pin) pin->rx_bit = pin->tx_bit = 0; pin->rx_msg.len = 0; memset(pin->rx_msg.msg, 0, sizeof(pin->rx_msg.msg)); - pin->state = CEC_ST_IDLE; pin->ts = ns_to_ktime(0); + pin->tx_generated_poll = false; + pin->tx_post_eom = false; + if (pin->state >= CEC_ST_TX_WAIT && + pin->state <= CEC_ST_TX_LOW_DRIVE) + pin->tx_toggle ^= 1; + if (pin->state >= CEC_ST_RX_START_BIT_LOW && + pin->state <= CEC_ST_RX_LOW_DRIVE) + pin->rx_toggle ^= 1; + pin->state = CEC_ST_IDLE; } /* @@ -174,42 +379,109 @@ static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts) break; case CEC_ST_TX_START_BIT_LOW: - pin->state = CEC_ST_TX_START_BIT_HIGH; + if (tx_short_start(pin)) { + /* + * Error Injection: send an invalid (too short) + * start pulse. + */ + pin->state = CEC_ST_TX_START_BIT_HIGH_SHORT; + } else if (tx_long_start(pin)) { + /* + * Error Injection: send an invalid (too long) + * start pulse. + */ + pin->state = CEC_ST_TX_START_BIT_HIGH_LONG; + } else { + pin->state = CEC_ST_TX_START_BIT_HIGH; + } + /* Generate start bit */ + cec_pin_high(pin); + break; + + case CEC_ST_TX_START_BIT_LOW_CUSTOM: + pin->state = CEC_ST_TX_START_BIT_HIGH_CUSTOM; /* Generate start bit */ cec_pin_high(pin); break; case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE: - /* If the read value is 1, then all is OK */ - if (!cec_pin_read(pin)) { + case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT: + case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG: + if (pin->tx_nacked) { + cec_pin_to_idle(pin); + pin->tx_msg.len = 0; + if (pin->tx_generated_poll) + break; + pin->work_tx_ts = ts; + pin->work_tx_status = CEC_TX_STATUS_NACK; + wake_up_interruptible(&pin->kthread_waitq); + break; + } + /* fall through */ + case CEC_ST_TX_DATA_BIT_0_HIGH: + case CEC_ST_TX_DATA_BIT_0_HIGH_SHORT: + case CEC_ST_TX_DATA_BIT_0_HIGH_LONG: + case CEC_ST_TX_DATA_BIT_1_HIGH: + case CEC_ST_TX_DATA_BIT_1_HIGH_SHORT: + case CEC_ST_TX_DATA_BIT_1_HIGH_LONG: + /* + * If the read value is 1, then all is OK, otherwise we have a + * low drive condition. + * + * Special case: when we generate a poll message due to an + * Arbitration Lost error injection, then ignore this since + * the pin can actually be low in that case. + */ + if (!cec_pin_read(pin) && !pin->tx_generated_poll) { /* * It's 0, so someone detected an error and pulled the * line low for 1.5 times the nominal bit period. */ pin->tx_msg.len = 0; + pin->state = CEC_ST_TX_WAIT_FOR_HIGH; pin->work_tx_ts = ts; pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE; - pin->state = CEC_ST_TX_WAIT_FOR_HIGH; + pin->tx_low_drive_cnt++; wake_up_interruptible(&pin->kthread_waitq); break; } - if (pin->tx_nacked) { + /* fall through */ + case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM: + if (tx_last_bit(pin)) { + /* Error Injection: just stop sending after this bit */ cec_pin_to_idle(pin); pin->tx_msg.len = 0; + if (pin->tx_generated_poll) + break; pin->work_tx_ts = ts; - pin->work_tx_status = CEC_TX_STATUS_NACK; + pin->work_tx_status = CEC_TX_STATUS_OK; wake_up_interruptible(&pin->kthread_waitq); break; } - /* fall through */ - case CEC_ST_TX_DATA_BIT_0_HIGH: - case CEC_ST_TX_DATA_BIT_1_HIGH: pin->tx_bit++; /* fall through */ case CEC_ST_TX_START_BIT_HIGH: - if (pin->tx_bit / 10 >= pin->tx_msg.len) { + case CEC_ST_TX_START_BIT_HIGH_SHORT: + case CEC_ST_TX_START_BIT_HIGH_LONG: + case CEC_ST_TX_START_BIT_HIGH_CUSTOM: + if (tx_low_drive(pin)) { + /* Error injection: go to low drive */ + cec_pin_low(pin); + pin->state = CEC_ST_TX_LOW_DRIVE; + pin->tx_msg.len = 0; + if (pin->tx_generated_poll) + break; + pin->work_tx_ts = ts; + pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE; + pin->tx_low_drive_cnt++; + wake_up_interruptible(&pin->kthread_waitq); + break; + } + if (pin->tx_bit / 10 >= pin->tx_msg.len + pin->tx_extra_bytes) { cec_pin_to_idle(pin); pin->tx_msg.len = 0; + if (pin->tx_generated_poll) + break; pin->work_tx_ts = ts; pin->work_tx_status = CEC_TX_STATUS_OK; wake_up_interruptible(&pin->kthread_waitq); @@ -217,39 +489,82 @@ static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts) } switch (pin->tx_bit % 10) { - default: - v = pin->tx_msg.msg[pin->tx_bit / 10] & - (1 << (7 - (pin->tx_bit % 10))); + default: { + /* + * In the CEC_ERROR_INJ_TX_ADD_BYTES case we transmit + * extra bytes, so pin->tx_bit / 10 can become >= 16. + * Generate bit values for those extra bytes instead + * of reading them from the transmit buffer. + */ + unsigned int idx = (pin->tx_bit / 10); + u8 val = idx; + + if (idx < pin->tx_msg.len) + val = pin->tx_msg.msg[idx]; + v = val & (1 << (7 - (pin->tx_bit % 10))); + pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW : - CEC_ST_TX_DATA_BIT_0_LOW; + CEC_ST_TX_DATA_BIT_0_LOW; break; - case 8: - v = pin->tx_bit / 10 == pin->tx_msg.len - 1; + } + case EOM_BIT: { + unsigned int tot_len = pin->tx_msg.len + + pin->tx_extra_bytes; + unsigned int tx_byte_idx = pin->tx_bit / 10; + + v = !pin->tx_post_eom && tx_byte_idx == tot_len - 1; + if (tot_len > 1 && tx_byte_idx == tot_len - 2 && + tx_early_eom(pin)) { + /* Error injection: set EOM one byte early */ + v = true; + pin->tx_post_eom = true; + } else if (v && tx_no_eom(pin)) { + /* Error injection: no EOM */ + v = false; + } pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW : - CEC_ST_TX_DATA_BIT_0_LOW; + CEC_ST_TX_DATA_BIT_0_LOW; break; - case 9: + } + case ACK_BIT: pin->state = CEC_ST_TX_DATA_BIT_1_LOW; break; } + if (tx_custom_bit(pin)) + pin->state = CEC_ST_TX_DATA_BIT_LOW_CUSTOM; cec_pin_low(pin); break; case CEC_ST_TX_DATA_BIT_0_LOW: case CEC_ST_TX_DATA_BIT_1_LOW: v = pin->state == CEC_ST_TX_DATA_BIT_1_LOW; - pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH : - CEC_ST_TX_DATA_BIT_0_HIGH; - is_ack_bit = pin->tx_bit % 10 == 9; - if (v && (pin->tx_bit < 4 || is_ack_bit)) + is_ack_bit = pin->tx_bit % 10 == ACK_BIT; + if (v && (pin->tx_bit < 4 || is_ack_bit)) { pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE; + } else if (!is_ack_bit && tx_short_bit(pin)) { + /* Error Injection: send an invalid (too short) bit */ + pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH_SHORT : + CEC_ST_TX_DATA_BIT_0_HIGH_SHORT; + } else if (!is_ack_bit && tx_long_bit(pin)) { + /* Error Injection: send an invalid (too long) bit */ + pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH_LONG : + CEC_ST_TX_DATA_BIT_0_HIGH_LONG; + } else { + pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH : + CEC_ST_TX_DATA_BIT_0_HIGH; + } + cec_pin_high(pin); + break; + + case CEC_ST_TX_DATA_BIT_LOW_CUSTOM: + pin->state = CEC_ST_TX_DATA_BIT_HIGH_CUSTOM; cec_pin_high(pin); break; case CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE: /* Read the CEC value at the sample time */ v = cec_pin_read(pin); - is_ack_bit = pin->tx_bit % 10 == 9; + is_ack_bit = pin->tx_bit % 10 == ACK_BIT; /* * If v == 0 and we're within the first 4 bits * of the initiator, then someone else started @@ -258,7 +573,7 @@ static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts) * transmitter has more leading 0 bits in the * initiator). */ - if (!v && !is_ack_bit) { + if (!v && !is_ack_bit && !pin->tx_generated_poll) { pin->tx_msg.len = 0; pin->work_tx_ts = ts; pin->work_tx_status = CEC_TX_STATUS_ARB_LOST; @@ -267,18 +582,27 @@ static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts) pin->tx_bit = 0; memset(pin->rx_msg.msg, 0, sizeof(pin->rx_msg.msg)); pin->rx_msg.msg[0] = pin->tx_msg.msg[0]; - pin->rx_msg.msg[0] &= ~(1 << (7 - pin->rx_bit)); + pin->rx_msg.msg[0] &= (0xff << (8 - pin->rx_bit)); pin->rx_msg.len = 0; + pin->ts = ktime_sub_us(ts, CEC_TIM_DATA_BIT_SAMPLE); pin->state = CEC_ST_RX_DATA_POST_SAMPLE; pin->rx_bit++; break; } pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE; + if (!is_ack_bit && tx_short_bit(pin)) { + /* Error Injection: send an invalid (too short) bit */ + pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT; + } else if (!is_ack_bit && tx_long_bit(pin)) { + /* Error Injection: send an invalid (too long) bit */ + pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG; + } if (!is_ack_bit) break; /* Was the message ACKed? */ ack = cec_msg_is_broadcast(&pin->tx_msg) ? v : !v; - if (!ack) { + if (!ack && !pin->tx_ignore_nack_until_eom && + pin->tx_bit / 10 < pin->tx_msg.len && !pin->tx_post_eom) { /* * Note: the CEC spec is ambiguous regarding * what action to take when a NACK appears @@ -295,6 +619,15 @@ static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts) } break; + case CEC_ST_TX_PULSE_LOW_CUSTOM: + cec_pin_high(pin); + pin->state = CEC_ST_TX_PULSE_HIGH_CUSTOM; + break; + + case CEC_ST_TX_PULSE_HIGH_CUSTOM: + cec_pin_to_idle(pin); + break; + default: break; } @@ -322,6 +655,7 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts) bool ack; bool bcast, for_us; u8 dest; + u8 poll; switch (pin->state) { /* Receive states */ @@ -331,24 +665,54 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts) break; pin->state = CEC_ST_RX_START_BIT_HIGH; delta = ktime_us_delta(ts, pin->ts); - pin->ts = ts; /* Start bit low is too short, go back to idle */ - if (delta < CEC_TIM_START_BIT_LOW_MIN - - CEC_TIM_IDLE_SAMPLE) { + if (delta < CEC_TIM_START_BIT_LOW_MIN - CEC_TIM_IDLE_SAMPLE) { + if (!pin->rx_start_bit_low_too_short_cnt++) { + pin->rx_start_bit_low_too_short_ts = ktime_to_ns(pin->ts); + pin->rx_start_bit_low_too_short_delta = delta; + } cec_pin_to_idle(pin); + break; + } + if (rx_arb_lost(pin, &poll)) { + cec_msg_init(&pin->tx_msg, poll >> 4, poll & 0xf); + pin->tx_generated_poll = true; + pin->tx_extra_bytes = 0; + pin->state = CEC_ST_TX_START_BIT_HIGH; + pin->ts = ts; } break; case CEC_ST_RX_START_BIT_HIGH: v = cec_pin_read(pin); delta = ktime_us_delta(ts, pin->ts); - if (v && delta > CEC_TIM_START_BIT_TOTAL_MAX - - CEC_TIM_START_BIT_LOW_MIN) { + /* + * Unfortunately the spec does not specify when to give up + * and go to idle. We just pick TOTAL_LONG. + */ + if (v && delta > CEC_TIM_START_BIT_TOTAL_LONG) { + pin->rx_start_bit_too_long_cnt++; cec_pin_to_idle(pin); break; } if (v) break; + /* Start bit is too short, go back to idle */ + if (delta < CEC_TIM_START_BIT_TOTAL_MIN - CEC_TIM_IDLE_SAMPLE) { + if (!pin->rx_start_bit_too_short_cnt++) { + pin->rx_start_bit_too_short_ts = ktime_to_ns(pin->ts); + pin->rx_start_bit_too_short_delta = delta; + } + cec_pin_to_idle(pin); + break; + } + if (rx_low_drive(pin)) { + /* Error injection: go to low drive */ + cec_pin_low(pin); + pin->state = CEC_ST_RX_LOW_DRIVE; + pin->rx_low_drive_cnt++; + break; + } pin->state = CEC_ST_RX_DATA_SAMPLE; pin->ts = ts; pin->rx_eom = false; @@ -363,36 +727,55 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts) pin->rx_msg.msg[pin->rx_bit / 10] |= v << (7 - (pin->rx_bit % 10)); break; - case 8: + case EOM_BIT: pin->rx_eom = v; pin->rx_msg.len = pin->rx_bit / 10 + 1; break; - case 9: + case ACK_BIT: break; } pin->rx_bit++; break; case CEC_ST_RX_DATA_POST_SAMPLE: - pin->state = CEC_ST_RX_DATA_HIGH; + pin->state = CEC_ST_RX_DATA_WAIT_FOR_LOW; break; - case CEC_ST_RX_DATA_HIGH: + case CEC_ST_RX_DATA_WAIT_FOR_LOW: v = cec_pin_read(pin); delta = ktime_us_delta(ts, pin->ts); - if (v && delta > CEC_TIM_DATA_BIT_TOTAL_MAX) { + /* + * Unfortunately the spec does not specify when to give up + * and go to idle. We just pick TOTAL_LONG. + */ + if (v && delta > CEC_TIM_DATA_BIT_TOTAL_LONG) { + pin->rx_data_bit_too_long_cnt++; cec_pin_to_idle(pin); break; } if (v) break; + + if (rx_low_drive(pin)) { + /* Error injection: go to low drive */ + cec_pin_low(pin); + pin->state = CEC_ST_RX_LOW_DRIVE; + pin->rx_low_drive_cnt++; + break; + } + /* * Go to low drive state when the total bit time is * too short. */ if (delta < CEC_TIM_DATA_BIT_TOTAL_MIN) { + if (!pin->rx_data_bit_too_short_cnt++) { + pin->rx_data_bit_too_short_ts = ktime_to_ns(pin->ts); + pin->rx_data_bit_too_short_delta = delta; + } cec_pin_low(pin); - pin->state = CEC_ST_LOW_DRIVE; + pin->state = CEC_ST_RX_LOW_DRIVE; + pin->rx_low_drive_cnt++; break; } pin->ts = ts; @@ -408,6 +791,11 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts) /* ACK bit value */ ack = bcast ? 1 : !for_us; + if (for_us && rx_nack(pin)) { + /* Error injection: toggle the ACK bit */ + ack = !ack; + } + if (ack) { /* No need to write to the bus, just wait */ pin->state = CEC_ST_RX_ACK_HIGH_POST; @@ -434,7 +822,7 @@ static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts) break; } pin->rx_bit++; - pin->state = CEC_ST_RX_DATA_HIGH; + pin->state = CEC_ST_RX_DATA_WAIT_FOR_LOW; break; case CEC_ST_RX_ACK_FINISH: @@ -456,6 +844,7 @@ static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer) struct cec_adapter *adap = pin->adap; ktime_t ts; s32 delta; + u32 usecs; ts = ktime_get(); if (ktime_to_ns(pin->timer_ts)) { @@ -503,13 +892,27 @@ static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer) /* Transmit states */ case CEC_ST_TX_WAIT_FOR_HIGH: case CEC_ST_TX_START_BIT_LOW: - case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE: - case CEC_ST_TX_DATA_BIT_0_HIGH: - case CEC_ST_TX_DATA_BIT_1_HIGH: case CEC_ST_TX_START_BIT_HIGH: + case CEC_ST_TX_START_BIT_HIGH_SHORT: + case CEC_ST_TX_START_BIT_HIGH_LONG: + case CEC_ST_TX_START_BIT_LOW_CUSTOM: + case CEC_ST_TX_START_BIT_HIGH_CUSTOM: case CEC_ST_TX_DATA_BIT_0_LOW: + case CEC_ST_TX_DATA_BIT_0_HIGH: + case CEC_ST_TX_DATA_BIT_0_HIGH_SHORT: + case CEC_ST_TX_DATA_BIT_0_HIGH_LONG: case CEC_ST_TX_DATA_BIT_1_LOW: + case CEC_ST_TX_DATA_BIT_1_HIGH: + case CEC_ST_TX_DATA_BIT_1_HIGH_SHORT: + case CEC_ST_TX_DATA_BIT_1_HIGH_LONG: case CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE: + case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE: + case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT: + case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG: + case CEC_ST_TX_DATA_BIT_LOW_CUSTOM: + case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM: + case CEC_ST_TX_PULSE_LOW_CUSTOM: + case CEC_ST_TX_PULSE_HIGH_CUSTOM: cec_pin_tx_states(pin, ts); break; @@ -518,7 +921,7 @@ static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer) case CEC_ST_RX_START_BIT_HIGH: case CEC_ST_RX_DATA_SAMPLE: case CEC_ST_RX_DATA_POST_SAMPLE: - case CEC_ST_RX_DATA_HIGH: + case CEC_ST_RX_DATA_WAIT_FOR_LOW: case CEC_ST_RX_ACK_LOW: case CEC_ST_RX_ACK_LOW_POST: case CEC_ST_RX_ACK_HIGH_POST: @@ -545,7 +948,10 @@ static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer) if (delta / CEC_TIM_DATA_BIT_TOTAL > pin->tx_signal_free_time) { pin->tx_nacked = false; - pin->state = CEC_ST_TX_START_BIT_LOW; + if (tx_custom_start(pin)) + pin->state = CEC_ST_TX_START_BIT_LOW_CUSTOM; + else + pin->state = CEC_ST_TX_START_BIT_LOW; /* Generate start bit */ cec_pin_low(pin); break; @@ -555,6 +961,13 @@ static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer) pin->state = CEC_ST_TX_WAIT; break; } + if (pin->tx_custom_pulse && pin->state == CEC_ST_IDLE) { + pin->tx_custom_pulse = false; + /* Generate custom pulse */ + cec_pin_low(pin); + pin->state = CEC_ST_TX_PULSE_LOW_CUSTOM; + break; + } if (pin->state != CEC_ST_IDLE || pin->ops->enable_irq == NULL || pin->enable_irq_failed || adap->is_configuring || adap->is_configured || adap->monitor_all_cnt) @@ -565,21 +978,40 @@ static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer) wake_up_interruptible(&pin->kthread_waitq); return HRTIMER_NORESTART; - case CEC_ST_LOW_DRIVE: + case CEC_ST_TX_LOW_DRIVE: + case CEC_ST_RX_LOW_DRIVE: + cec_pin_high(pin); cec_pin_to_idle(pin); break; default: break; } - if (!adap->monitor_pin_cnt || states[pin->state].usecs <= 150) { + + switch (pin->state) { + case CEC_ST_TX_START_BIT_LOW_CUSTOM: + case CEC_ST_TX_DATA_BIT_LOW_CUSTOM: + case CEC_ST_TX_PULSE_LOW_CUSTOM: + usecs = pin->tx_custom_low_usecs; + break; + case CEC_ST_TX_START_BIT_HIGH_CUSTOM: + case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM: + case CEC_ST_TX_PULSE_HIGH_CUSTOM: + usecs = pin->tx_custom_high_usecs; + break; + default: + usecs = states[pin->state].usecs; + break; + } + + if (!adap->monitor_pin_cnt || usecs <= 150) { pin->wait_usecs = 0; - pin->timer_ts = ktime_add_us(ts, states[pin->state].usecs); + pin->timer_ts = ktime_add_us(ts, usecs); hrtimer_forward_now(timer, - ns_to_ktime(states[pin->state].usecs * 1000)); + ns_to_ktime(usecs * 1000)); return HRTIMER_RESTART; } - pin->wait_usecs = states[pin->state].usecs - 100; + pin->wait_usecs = usecs - 100; pin->timer_ts = ktime_add_us(ts, 100); hrtimer_forward_now(timer, ns_to_ktime(100000)); return HRTIMER_RESTART; @@ -596,12 +1028,25 @@ static int cec_pin_thread_func(void *_adap) pin->work_rx_msg.len || pin->work_tx_status || atomic_read(&pin->work_irq_change) || - atomic_read(&pin->work_pin_events)); + atomic_read(&pin->work_pin_num_events)); if (pin->work_rx_msg.len) { - cec_received_msg_ts(adap, &pin->work_rx_msg, + struct cec_msg *msg = &pin->work_rx_msg; + + if (msg->len > 1 && msg->len < CEC_MAX_MSG_SIZE && + rx_add_byte(pin)) { + /* Error injection: add byte to the message */ + msg->msg[msg->len++] = 0x55; + } + if (msg->len > 2 && rx_remove_byte(pin)) { + /* Error injection: remove byte from message */ + msg->len--; + } + if (msg->len > CEC_MAX_MSG_SIZE) + msg->len = CEC_MAX_MSG_SIZE; + cec_received_msg_ts(adap, msg, ns_to_ktime(pin->work_rx_msg.rx_ts)); - pin->work_rx_msg.len = 0; + msg->len = 0; } if (pin->work_tx_status) { unsigned int tx_status = pin->work_tx_status; @@ -611,14 +1056,16 @@ static int cec_pin_thread_func(void *_adap) pin->work_tx_ts); } - while (atomic_read(&pin->work_pin_events)) { + while (atomic_read(&pin->work_pin_num_events)) { unsigned int idx = pin->work_pin_events_rd; + u8 v = pin->work_pin_events[idx]; cec_queue_pin_cec_event(adap, - pin->work_pin_is_high[idx], + v & CEC_PIN_EVENT_FL_IS_HIGH, + v & CEC_PIN_EVENT_FL_DROPPED, pin->work_pin_ts[idx]); pin->work_pin_events_rd = (idx + 1) % CEC_NUM_PIN_EVENTS; - atomic_dec(&pin->work_pin_events); + atomic_dec(&pin->work_pin_num_events); } switch (atomic_xchg(&pin->work_irq_change, @@ -654,8 +1101,9 @@ static int cec_pin_adap_enable(struct cec_adapter *adap, bool enable) pin->enabled = enable; if (enable) { - atomic_set(&pin->work_pin_events, 0); + atomic_set(&pin->work_pin_num_events, 0); pin->work_pin_events_rd = pin->work_pin_events_wr = 0; + pin->work_pin_events_dropped = false; cec_pin_read(pin); cec_pin_to_idle(pin); pin->tx_msg.len = 0; @@ -692,23 +1140,37 @@ static int cec_pin_adap_log_addr(struct cec_adapter *adap, u8 log_addr) return 0; } +void cec_pin_start_timer(struct cec_pin *pin) +{ + if (pin->state != CEC_ST_RX_IRQ) + return; + + atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_UNCHANGED); + pin->ops->disable_irq(pin->adap); + cec_pin_high(pin); + cec_pin_to_idle(pin); + hrtimer_start(&pin->timer, ns_to_ktime(0), HRTIMER_MODE_REL); +} + static int cec_pin_adap_transmit(struct cec_adapter *adap, u8 attempts, u32 signal_free_time, struct cec_msg *msg) { struct cec_pin *pin = adap->pin; pin->tx_signal_free_time = signal_free_time; + pin->tx_extra_bytes = 0; pin->tx_msg = *msg; + if (msg->len > 1) { + /* Error injection: add byte to the message */ + pin->tx_extra_bytes = tx_add_bytes(pin); + } + if (msg->len > 2 && tx_remove_byte(pin)) { + /* Error injection: remove byte from the message */ + pin->tx_msg.len--; + } pin->work_tx_status = 0; pin->tx_bit = 0; - if (pin->state == CEC_ST_RX_IRQ) { - atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_UNCHANGED); - pin->ops->disable_irq(adap); - cec_pin_high(pin); - cec_pin_to_idle(pin); - hrtimer_start(&pin->timer, ns_to_ktime(0), - HRTIMER_MODE_REL); - } + cec_pin_start_timer(pin); return 0; } @@ -717,10 +1179,12 @@ static void cec_pin_adap_status(struct cec_adapter *adap, { struct cec_pin *pin = adap->pin; - seq_printf(file, "state: %s\n", states[pin->state].name); - seq_printf(file, "tx_bit: %d\n", pin->tx_bit); - seq_printf(file, "rx_bit: %d\n", pin->rx_bit); + seq_printf(file, "state: %s\n", states[pin->state].name); + seq_printf(file, "tx_bit: %d\n", pin->tx_bit); + seq_printf(file, "rx_bit: %d\n", pin->rx_bit); seq_printf(file, "cec pin: %d\n", pin->ops->read(adap)); + seq_printf(file, "cec pin events dropped: %u\n", + pin->work_pin_events_dropped_cnt); seq_printf(file, "irq failed: %d\n", pin->enable_irq_failed); if (pin->timer_100ms_overruns) { seq_printf(file, "timer overruns > 100ms: %u of %u\n", @@ -732,11 +1196,45 @@ static void cec_pin_adap_status(struct cec_adapter *adap, seq_printf(file, "avg timer overrun: %u usecs\n", pin->timer_sum_overrun / pin->timer_100ms_overruns); } + if (pin->rx_start_bit_low_too_short_cnt) + seq_printf(file, + "rx start bit low too short: %u (delta %u, ts %llu)\n", + pin->rx_start_bit_low_too_short_cnt, + pin->rx_start_bit_low_too_short_delta, + pin->rx_start_bit_low_too_short_ts); + if (pin->rx_start_bit_too_short_cnt) + seq_printf(file, + "rx start bit too short: %u (delta %u, ts %llu)\n", + pin->rx_start_bit_too_short_cnt, + pin->rx_start_bit_too_short_delta, + pin->rx_start_bit_too_short_ts); + if (pin->rx_start_bit_too_long_cnt) + seq_printf(file, "rx start bit too long: %u\n", + pin->rx_start_bit_too_long_cnt); + if (pin->rx_data_bit_too_short_cnt) + seq_printf(file, + "rx data bit too short: %u (delta %u, ts %llu)\n", + pin->rx_data_bit_too_short_cnt, + pin->rx_data_bit_too_short_delta, + pin->rx_data_bit_too_short_ts); + if (pin->rx_data_bit_too_long_cnt) + seq_printf(file, "rx data bit too long: %u\n", + pin->rx_data_bit_too_long_cnt); + seq_printf(file, "rx initiated low drive: %u\n", pin->rx_low_drive_cnt); + seq_printf(file, "tx detected low drive: %u\n", pin->tx_low_drive_cnt); + pin->work_pin_events_dropped_cnt = 0; pin->timer_cnt = 0; pin->timer_100ms_overruns = 0; pin->timer_300ms_overruns = 0; pin->timer_max_overrun = 0; pin->timer_sum_overrun = 0; + pin->rx_start_bit_low_too_short_cnt = 0; + pin->rx_start_bit_too_short_cnt = 0; + pin->rx_start_bit_too_long_cnt = 0; + pin->rx_data_bit_too_short_cnt = 0; + pin->rx_data_bit_too_long_cnt = 0; + pin->rx_low_drive_cnt = 0; + pin->tx_low_drive_cnt = 0; if (pin->ops->status) pin->ops->status(adap, file); } @@ -778,6 +1276,10 @@ static const struct cec_adap_ops cec_pin_adap_ops = { .adap_transmit = cec_pin_adap_transmit, .adap_status = cec_pin_adap_status, .adap_free = cec_pin_adap_free, +#ifdef CONFIG_CEC_PIN_ERROR_INJ + .error_inj_parse_line = cec_pin_error_inj_parse_line, + .error_inj_show = cec_pin_error_inj_show, +#endif }; struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops, @@ -792,6 +1294,8 @@ struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops, hrtimer_init(&pin->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); pin->timer.function = cec_pin_timer; init_waitqueue_head(&pin->kthread_waitq); + pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT; + pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT; adap = cec_allocate_adapter(&cec_pin_adap_ops, priv, name, caps | CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN, |