| Patrick Venture | 75e56c6 | 2018-04-20 18:10:15 -0700 | [diff] [blame] | 1 | #pragma once |
| 2 | |
| 3 | #include <chrono> |
| 4 | #include <string> |
| 5 | |
| 6 | namespace hwmonio { |
| 7 | |
| 8 | static constexpr auto retries = 10; |
| 9 | static constexpr auto delay = std::chrono::milliseconds{100}; |
| 10 | |
| 11 | /** @class HwmonIO |
| 12 | * @brief Convenience wrappers for HWMON sysfs attribute IO. |
| 13 | * |
| 14 | * Unburden the rest of the application from having to check |
| 15 | * ENOENT after every hwmon attribute io operation. Hwmon |
| 16 | * device drivers can be unbound at any time; the program |
| 17 | * cannot always be terminated externally before we try to |
| 18 | * do an io. |
| 19 | */ |
| 20 | class HwmonIO |
| 21 | { |
| 22 | public: |
| 23 | HwmonIO() = delete; |
| 24 | HwmonIO(const HwmonIO&) = default; |
| 25 | HwmonIO(HwmonIO&&) = default; |
| 26 | HwmonIO& operator=(const HwmonIO&) = default; |
| 27 | HwmonIO& operator=(HwmonIO&&) = default; |
| 28 | ~HwmonIO() = default; |
| 29 | |
| 30 | /** @brief Constructor |
| 31 | * |
| 32 | * @param[in] path - hwmon instance root - eg: |
| 33 | * /sys/class/hwmon/hwmon<N> |
| 34 | */ |
| 35 | explicit HwmonIO(const std::string& path); |
| 36 | |
| 37 | /** @brief Perform formatted hwmon sysfs read. |
| 38 | * |
| 39 | * Propagates any exceptions other than ENOENT. |
| 40 | * ENOENT will result in a call to exit(0) in case |
| 41 | * the underlying hwmon driver is unbound and |
| 42 | * the program is inadvertently left running. |
| 43 | * |
| 44 | * For possibly transient errors will retry up to |
| 45 | * the specified number of times. |
| 46 | * |
| 47 | * @param[in] type - The hwmon type (ex. temp). |
| 48 | * @param[in] id - The hwmon id (ex. 1). |
| 49 | * @param[in] sensor - The hwmon sensor (ex. input). |
| 50 | * @param[in] retries - The number of times to retry. |
| 51 | * @param[in] delay - The time to sleep between retry attempts. |
| 52 | * |
| 53 | * @return val - The read value. |
| 54 | */ |
| 55 | int64_t read( |
| 56 | const std::string& type, |
| 57 | const std::string& id, |
| 58 | const std::string& sensor, |
| 59 | size_t retries, |
| Matthew Barth | 0b30505 | 2018-04-26 09:46:49 -0500 | [diff] [blame] | 60 | std::chrono::milliseconds delay) const; |
| Patrick Venture | 75e56c6 | 2018-04-20 18:10:15 -0700 | [diff] [blame] | 61 | |
| 62 | /** @brief Perform formatted hwmon sysfs write. |
| 63 | * |
| 64 | * Propagates any exceptions other than ENOENT. |
| 65 | * ENOENT will result in a call to exit(0) in case |
| 66 | * the underlying hwmon driver is unbound and |
| 67 | * the program is inadvertently left running. |
| 68 | * |
| 69 | * For possibly transient errors will retry up to |
| 70 | * the specified number of times. |
| 71 | * |
| 72 | * @param[in] val - The value to be written. |
| 73 | * @param[in] type - The hwmon type (ex. fan). |
| 74 | * @param[in] id - The hwmon id (ex. 1). |
| 75 | * @param[in] retries - The number of times to retry. |
| 76 | * @param[in] delay - The time to sleep between retry attempts. |
| 77 | */ |
| 78 | void write( |
| 79 | uint32_t val, |
| 80 | const std::string& type, |
| 81 | const std::string& id, |
| 82 | const std::string& sensor, |
| 83 | size_t retries, |
| 84 | std::chrono::milliseconds delay) const; |
| 85 | |
| 86 | |
| 87 | /** @brief Hwmon instance path access. |
| 88 | * |
| 89 | * @return path - The hwmon instance path. |
| 90 | */ |
| 91 | std::string path() const; |
| 92 | |
| 93 | private: |
| 94 | std::string p; |
| 95 | }; |
| 96 | } // namespace hwmonio |
| 97 | |
| 98 | // vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4 |