Ben Tyner | b797b3e | 2020-06-29 10:12:05 -0500 | [diff] [blame] | 1 | #include <attn/attn_handler.hpp> |
Ben Tyner | b797b3e | 2020-06-29 10:12:05 -0500 | [diff] [blame] | 2 | #include <attn/attn_monitor.hpp> |
austinfcui | bfa831a | 2022-01-26 15:37:07 -0600 | [diff] [blame] | 3 | #include <util/trace.hpp> |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 4 | |
| 5 | namespace attn |
| 6 | { |
| 7 | |
| 8 | /** @brief Register a callback for gpio event */ |
| 9 | void AttnMonitor::scheduleGPIOEvent() |
| 10 | { |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 11 | // Register async callback, note that callback is a |
| 12 | // lambda function with "this" pointer captured |
| 13 | iv_gpioEventDescriptor.async_wait( |
| 14 | boost::asio::posix::stream_descriptor::wait_read, |
| 15 | [this](const boost::system::error_code& ec) { |
| 16 | if (ec) |
| 17 | { |
austinfcui | bfa831a | 2022-01-26 15:37:07 -0600 | [diff] [blame] | 18 | trace::err("GPIO Async wait error: %s", ec.message().c_str()); |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 19 | } |
| 20 | else |
| 21 | { |
austinfcui | bfa831a | 2022-01-26 15:37:07 -0600 | [diff] [blame] | 22 | trace::inf("Attention GPIO active"); |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 23 | handleGPIOEvent(); // gpio trigger detected |
| 24 | } |
| 25 | return; |
| 26 | }); // register async callback |
| 27 | } |
| 28 | |
| 29 | /** @brief Handle the GPIO state change event */ |
| 30 | void AttnMonitor::handleGPIOEvent() |
| 31 | { |
| 32 | gpiod_line_event gpioEvent; |
| 33 | std::string logMessage; |
| 34 | |
| 35 | if (gpiod_line_event_read_fd(iv_gpioEventDescriptor.native_handle(), |
| 36 | &gpioEvent) < 0) |
| 37 | { |
austinfcui | bfa831a | 2022-01-26 15:37:07 -0600 | [diff] [blame] | 38 | trace::err("GPIO line read failed"); |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 39 | } |
| 40 | else |
| 41 | { |
| 42 | switch (gpiod_line_get_value(iv_gpioLine)) |
| 43 | { |
| 44 | // active attention when gpio == 0 |
| 45 | case 0: |
Ben Tyner | 3fb52e5 | 2020-03-31 10:10:07 -0500 | [diff] [blame] | 46 | attnHandler(iv_config); |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 47 | break; |
| 48 | |
| 49 | // gpio == 1, GPIO handler should not be executing |
| 50 | case 1: |
austinfcui | bfa831a | 2022-01-26 15:37:07 -0600 | [diff] [blame] | 51 | trace::inf("GPIO handler out of sync"); |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 52 | break; |
| 53 | |
| 54 | // unexpected value |
| 55 | default: |
austinfcui | bfa831a | 2022-01-26 15:37:07 -0600 | [diff] [blame] | 56 | trace::inf("GPIO line unexpected value"); |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 57 | } |
| 58 | } |
| 59 | scheduleGPIOEvent(); // continue monitoring gpio |
| 60 | } |
| 61 | |
| 62 | /** @brief Request a GPIO line for monitoring attention events */ |
| 63 | void AttnMonitor::requestGPIOEvent() |
| 64 | { |
| 65 | if (0 != gpiod_line_request(iv_gpioLine, &iv_gpioConfig, 0)) |
| 66 | { |
austinfcui | bfa831a | 2022-01-26 15:37:07 -0600 | [diff] [blame] | 67 | trace::err("failed request for GPIO"); |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 68 | } |
| 69 | else |
| 70 | { |
| 71 | int gpioLineFd; |
| 72 | |
| 73 | gpioLineFd = gpiod_line_event_get_fd(iv_gpioLine); |
| 74 | if (gpioLineFd < 0) |
| 75 | { |
austinfcui | bfa831a | 2022-01-26 15:37:07 -0600 | [diff] [blame] | 76 | trace::err("failed to get file descriptor"); |
Ben Tyner | 73ac368 | 2020-01-09 10:46:47 -0600 | [diff] [blame] | 77 | } |
| 78 | else |
| 79 | { |
| 80 | // Register file descriptor for monitoring |
| 81 | iv_gpioEventDescriptor.assign(gpioLineFd); |
| 82 | |
| 83 | // Start monitoring |
| 84 | scheduleGPIOEvent(); |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | } // namespace attn |