drivers: modem: cellular: Close down CMUX before shut down #97571
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Refactor internal event bits to use state enum values and define set_state() and wait_state() so we don't need two set of variables to maintain. Signed-off-by: Seppo Takalo <[email protected]>
Instead of dropping all responses, handle the CLD. Signed-off-by: Seppo Takalo <[email protected]>
If we immediately send disconnected event when CLD is received, we might close the UART pipe before the response is actually send. Also, shutdown_handler should not retry indefinitely. Signed-off-by: Seppo Takalo <[email protected]>
Properly close down the CMUX channel before shutting down the modem. The CMUX Close-Down command should indicate the remote end to clean up, even if we don't have shutdown script or power-key GPIO. Signed-off-by: Seppo Takalo <[email protected]>
zephyrbot
added
area: Modem
area: Modem Drivers
area: Tests
|
SeppoTakalo
commented
Oct 15, 2025
| case MODEM_CMUX_COMMAND_CLD: | ||
| modem_cmux_on_cld_command(cmux, command); | ||
| break; | ||
| default: |
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For reviewers: In case you are wondering why switch-case with only one case, see the PR #97362 there is PSC command handler coming.
This is just split into its own PR.
bjarki-andreasen
approved these changes
Oct 15, 2025
rerickson1
approved these changes
Oct 15, 2025
Comment on lines
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| set_state(cmux, MODEM_CMUX_STATE_DISCONNECTED); | ||
| k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER); | ||
| cmux->flow_control_on = false; | ||
| k_mutex_unlock(&cmux->transmit_rb_lock); | ||
| modem_cmux_raise_event(cmux, MODEM_CMUX_EVENT_DISCONNECTED); | ||
| } else { | ||
| set_state(cmux, MODEM_CMUX_STATE_DISCONNECTING); | ||
| k_work_schedule(&cmux->disconnect_work, MODEM_CMUX_T1_TIMEOUT); |
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This code is duplicated in two spots. Maybe make it a function?
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drivers: modem: cellular: Close down CMUX before shut down
Properly close down the CMUX channel before shutting down
the modem.
The CMUX Close-Down command should indicate the remote end
to clean up, even if we don't have shutdown script or power-key GPIO.
Requires also minor fix to CMUX so we send disconnect event only after responding to CLD (Multiplexer Close Down).
If we immediately send disconnected event when CLD is received,
we might close the UART pipe before the response is actually send.
Contains changes from PR #97570