> +     switch (event) {
> +     case I2C_SLAVE_STOP:
> +             command_size = panel->idx;
> +             fallthrough;
> +     case I2C_SLAVE_WRITE_REQUESTED:
> +             panel->idx = 0;
> +             break;
> +     case I2C_SLAVE_WRITE_RECEIVED:
> +             if (panel->idx < sizeof(panel->command))
> +                     panel->command[panel->idx++] = *val;
> +             else
> +                     dev_dbg(&panel->input->dev, "command truncated\n");

Just double checking: Do you really want to process truncated commands?
Since you detect the state here, you could also choose to reject such
commands?

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