Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 1 | #include <errno.h> |
| 2 | #include <string.h> |
| 3 | #include <osmocom/core/linuxlist.h> |
| 4 | #include <osmocom/core/utils.h> |
| 5 | |
| 6 | #include "cuart.h" |
| 7 | |
| 8 | static LLIST_HEAD(g_cuart_drivers); |
| 9 | |
| 10 | const struct value_string card_uart_event_vals[] = { |
| 11 | OSMO_VALUE_STRING(CUART_E_RX_SINGLE), |
| 12 | OSMO_VALUE_STRING(CUART_E_RX_COMPLETE), |
| 13 | OSMO_VALUE_STRING(CUART_E_RX_TIMEOUT), |
| 14 | OSMO_VALUE_STRING(CUART_E_TX_COMPLETE), |
| 15 | { 0, NULL } |
| 16 | }; |
| 17 | |
| 18 | static struct card_uart_driver *cuart_drv_by_name(const char *driver_name) |
| 19 | { |
| 20 | struct card_uart_driver *drv; |
| 21 | llist_for_each_entry(drv, &g_cuart_drivers, list) { |
| 22 | if (!strcmp(drv->name, driver_name)) |
| 23 | return drv; |
| 24 | } |
| 25 | return NULL; |
| 26 | } |
| 27 | |
| 28 | int card_uart_open(struct card_uart *cuart, const char *driver_name, const char *device_name) |
| 29 | { |
| 30 | struct card_uart_driver *drv = cuart_drv_by_name(driver_name); |
| 31 | int rc; |
| 32 | |
| 33 | if (!drv) |
| 34 | return -ENODEV; |
| 35 | |
| 36 | cuart->rx_enabled = true; |
| 37 | cuart->rx_threshold = 1; |
| 38 | |
| 39 | rc = drv->ops->open(cuart, device_name); |
| 40 | if (rc < 0) |
| 41 | return rc; |
| 42 | |
| 43 | cuart->driver = drv; |
| 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | int card_uart_close(struct card_uart *cuart) |
| 48 | { |
| 49 | OSMO_ASSERT(cuart); |
| 50 | OSMO_ASSERT(cuart->driver); |
| 51 | OSMO_ASSERT(cuart->driver->ops); |
| 52 | OSMO_ASSERT(cuart->driver->ops->close); |
| 53 | return cuart->driver->ops->close(cuart); |
| 54 | } |
| 55 | |
| 56 | int card_uart_ctrl(struct card_uart *cuart, enum card_uart_ctl ctl, bool enable) |
| 57 | { |
| 58 | int rc; |
| 59 | OSMO_ASSERT(cuart); |
| 60 | OSMO_ASSERT(cuart->driver); |
| 61 | OSMO_ASSERT(cuart->driver->ops); |
| 62 | OSMO_ASSERT(cuart->driver->ops->ctrl); |
| 63 | rc = cuart->driver->ops->ctrl(cuart, ctl, enable); |
| 64 | if (rc < 0) |
| 65 | return rc; |
| 66 | |
| 67 | switch (ctl) { |
| 68 | case CUART_CTL_RX: |
| 69 | cuart->rx_enabled = enable; |
| 70 | break; |
| 71 | default: |
| 72 | break; |
| 73 | } |
| 74 | |
| 75 | return rc; |
| 76 | } |
| 77 | |
| 78 | int card_uart_tx(struct card_uart *cuart, const uint8_t *data, size_t len, bool rx_after_complete) |
| 79 | { |
| 80 | OSMO_ASSERT(cuart); |
| 81 | OSMO_ASSERT(cuart->driver); |
| 82 | OSMO_ASSERT(cuart->driver->ops); |
| 83 | OSMO_ASSERT(cuart->driver->ops->async_tx); |
| 84 | |
| 85 | OSMO_ASSERT(!cuart->tx_busy); |
| 86 | cuart->tx_busy = true; |
| 87 | /* disable receiver to avoid receiving what we transmit */ |
| 88 | card_uart_ctrl(cuart, CUART_CTL_RX, false); |
| 89 | |
| 90 | return cuart->driver->ops->async_tx(cuart, data, len, rx_after_complete); |
| 91 | } |
| 92 | |
| 93 | int card_uart_rx(struct card_uart *cuart, uint8_t *data, size_t len) |
| 94 | { |
| 95 | OSMO_ASSERT(cuart); |
| 96 | OSMO_ASSERT(cuart->driver); |
| 97 | OSMO_ASSERT(cuart->driver->ops); |
| 98 | OSMO_ASSERT(cuart->driver->ops->async_rx); |
| 99 | return cuart->driver->ops->async_rx(cuart, data, len); |
| 100 | } |
| 101 | |
| 102 | void card_uart_set_rx_threshold(struct card_uart *cuart, size_t rx_threshold) |
| 103 | { |
| 104 | cuart->rx_threshold = rx_threshold; |
| 105 | } |
| 106 | |
| 107 | void card_uart_notification(struct card_uart *cuart, enum card_uart_event evt, void *data) |
| 108 | { |
| 109 | OSMO_ASSERT(cuart); |
| 110 | OSMO_ASSERT(cuart->handle_event); |
| 111 | |
| 112 | switch (evt) { |
| 113 | case CUART_E_TX_COMPLETE: |
| 114 | cuart->tx_busy = false; |
| 115 | /* re-enable receiver if we're done with transmit */ |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 116 | card_uart_ctrl(cuart, CUART_CTL_RX, true); |
| 117 | break; |
| 118 | default: |
| 119 | break; |
| 120 | } |
| 121 | |
| 122 | cuart->handle_event(cuart, evt, data); |
| 123 | } |
| 124 | |
| 125 | int card_uart_driver_register(struct card_uart_driver *drv) |
| 126 | { |
| 127 | OSMO_ASSERT(!cuart_drv_by_name(drv->name)); |
| 128 | OSMO_ASSERT(drv->name); |
| 129 | OSMO_ASSERT(drv->ops); |
| 130 | llist_add_tail(&drv->list, &g_cuart_drivers); |
| 131 | return 0; |
| 132 | } |