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> |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 5 | #include <osmocom/core/timer.h> |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 6 | |
| 7 | #include "cuart.h" |
| 8 | |
| 9 | static LLIST_HEAD(g_cuart_drivers); |
| 10 | |
| 11 | const struct value_string card_uart_event_vals[] = { |
| 12 | OSMO_VALUE_STRING(CUART_E_RX_SINGLE), |
| 13 | OSMO_VALUE_STRING(CUART_E_RX_COMPLETE), |
| 14 | OSMO_VALUE_STRING(CUART_E_RX_TIMEOUT), |
| 15 | OSMO_VALUE_STRING(CUART_E_TX_COMPLETE), |
| 16 | { 0, NULL } |
| 17 | }; |
| 18 | |
| 19 | static struct card_uart_driver *cuart_drv_by_name(const char *driver_name) |
| 20 | { |
| 21 | struct card_uart_driver *drv; |
| 22 | llist_for_each_entry(drv, &g_cuart_drivers, list) { |
| 23 | if (!strcmp(drv->name, driver_name)) |
| 24 | return drv; |
| 25 | } |
| 26 | return NULL; |
| 27 | } |
| 28 | |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 29 | /* obtain the current ETU in us */ |
| 30 | static int get_etu_in_us(struct card_uart *cuart) |
| 31 | { |
Eric Wild | dbff421 | 2019-11-27 19:02:31 +0100 | [diff] [blame] | 32 | OSMO_ASSERT(cuart); |
| 33 | OSMO_ASSERT(cuart->driver); |
| 34 | OSMO_ASSERT(cuart->driver->ops); |
| 35 | OSMO_ASSERT(cuart->driver->ops->ctrl); |
| 36 | |
| 37 | return 1e6 / cuart->driver->ops->ctrl(cuart, CUART_CTL_GET_BAUDRATE, 0); |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | /* software waiting-time timer has expired */ |
| 41 | static void card_uart_wtime_cb(void *data) |
| 42 | { |
| 43 | struct card_uart *cuart = (struct card_uart *) data; |
| 44 | card_uart_notification(cuart, CUART_E_RX_TIMEOUT, NULL); |
| 45 | /* should we automatically disable the receiver? */ |
| 46 | } |
| 47 | |
| 48 | void card_uart_wtime_restart(struct card_uart *cuart) |
| 49 | { |
| 50 | int secs, usecs; |
| 51 | |
Eric Wild | 2f5cdd1 | 2019-11-27 18:40:44 +0100 | [diff] [blame] | 52 | if(!cuart->current_wtime_byte) |
| 53 | return; |
| 54 | |
Eric Wild | 5fcfc49 | 2020-04-03 22:27:18 +0200 | [diff] [blame] | 55 | int etu_in_us = get_etu_in_us(cuart) + 1; |
| 56 | cuart->wtime_etu = cuart->wtime_etu ? cuart->wtime_etu : 1; |
| 57 | |
Eric Wild | 2f5cdd1 | 2019-11-27 18:40:44 +0100 | [diff] [blame] | 58 | /* timemout is wtime * ETU + expected number of bytes * (12ETU+1 slack)ETU */ |
Eric Wild | 5fcfc49 | 2020-04-03 22:27:18 +0200 | [diff] [blame] | 59 | usecs = etu_in_us * cuart->wtime_etu + |
| 60 | etu_in_us * cuart->current_wtime_byte * (12+1); |
| 61 | |
| 62 | /* limit lower wait time to reasonable value */ |
| 63 | usecs = usecs < 300000 ? 300000 : usecs; |
| 64 | |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 65 | if (usecs > 1000000) { |
| 66 | secs = usecs / 1000000; |
| 67 | usecs = usecs % 1000000; |
| 68 | } else |
| 69 | secs = 0; |
| 70 | osmo_timer_schedule(&cuart->wtime_tmr, secs, usecs); |
| 71 | } |
| 72 | |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 73 | int card_uart_open(struct card_uart *cuart, const char *driver_name, const char *device_name) |
| 74 | { |
| 75 | struct card_uart_driver *drv = cuart_drv_by_name(driver_name); |
| 76 | int rc; |
| 77 | |
| 78 | if (!drv) |
| 79 | return -ENODEV; |
| 80 | |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 81 | cuart->wtime_etu = 9600; /* ISO 7816-3 Section 8.1 */ |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 82 | cuart->rx_enabled = true; |
| 83 | cuart->rx_threshold = 1; |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 84 | osmo_timer_setup(&cuart->wtime_tmr, card_uart_wtime_cb, cuart); |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 85 | |
| 86 | rc = drv->ops->open(cuart, device_name); |
| 87 | if (rc < 0) |
| 88 | return rc; |
| 89 | |
| 90 | cuart->driver = drv; |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | int card_uart_close(struct card_uart *cuart) |
| 95 | { |
| 96 | OSMO_ASSERT(cuart); |
| 97 | OSMO_ASSERT(cuart->driver); |
| 98 | OSMO_ASSERT(cuart->driver->ops); |
| 99 | OSMO_ASSERT(cuart->driver->ops->close); |
| 100 | return cuart->driver->ops->close(cuart); |
| 101 | } |
| 102 | |
Harald Welte | 9700d39 | 2019-10-09 20:17:28 +0200 | [diff] [blame] | 103 | int card_uart_ctrl(struct card_uart *cuart, enum card_uart_ctl ctl, int arg) |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 104 | { |
| 105 | int rc; |
| 106 | OSMO_ASSERT(cuart); |
| 107 | OSMO_ASSERT(cuart->driver); |
| 108 | OSMO_ASSERT(cuart->driver->ops); |
| 109 | OSMO_ASSERT(cuart->driver->ops->ctrl); |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 110 | |
Harald Welte | 9700d39 | 2019-10-09 20:17:28 +0200 | [diff] [blame] | 111 | rc = cuart->driver->ops->ctrl(cuart, ctl, arg); |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 112 | if (rc < 0) |
| 113 | return rc; |
| 114 | |
| 115 | switch (ctl) { |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 116 | case CUART_CTL_WTIME: |
| 117 | cuart->wtime_etu = arg; |
| 118 | break; |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 119 | case CUART_CTL_RX: |
Harald Welte | 9700d39 | 2019-10-09 20:17:28 +0200 | [diff] [blame] | 120 | cuart->rx_enabled = arg ? true : false; |
Harald Welte | 7b64fc0 | 2019-10-09 20:49:35 +0200 | [diff] [blame] | 121 | if (!cuart->rx_enabled) |
| 122 | osmo_timer_del(&cuart->wtime_tmr); |
Eric Wild | 2f5cdd1 | 2019-11-27 18:40:44 +0100 | [diff] [blame] | 123 | // else |
| 124 | // card_uart_wtime_restart(cuart); |
| 125 | break; |
| 126 | case CUART_CTL_RX_TIMER_HINT: |
| 127 | cuart->current_wtime_byte = arg; |
| 128 | if(arg) |
| 129 | card_uart_wtime_restart(cuart); |
| 130 | else |
| 131 | osmo_timer_del(&cuart->wtime_tmr); |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 132 | break; |
| 133 | default: |
| 134 | break; |
| 135 | } |
| 136 | |
| 137 | return rc; |
| 138 | } |
| 139 | |
Harald Welte | 6603d95 | 2019-10-09 20:50:13 +0200 | [diff] [blame] | 140 | int card_uart_tx(struct card_uart *cuart, const uint8_t *data, size_t len, bool rx_after_complete) |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 141 | { |
| 142 | OSMO_ASSERT(cuart); |
| 143 | OSMO_ASSERT(cuart->driver); |
| 144 | OSMO_ASSERT(cuart->driver->ops); |
| 145 | OSMO_ASSERT(cuart->driver->ops->async_tx); |
| 146 | |
| 147 | OSMO_ASSERT(!cuart->tx_busy); |
| 148 | cuart->tx_busy = true; |
Harald Welte | 6603d95 | 2019-10-09 20:50:13 +0200 | [diff] [blame] | 149 | cuart->rx_after_tx_compl = rx_after_complete; |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 150 | /* disable receiver to avoid receiving what we transmit */ |
| 151 | card_uart_ctrl(cuart, CUART_CTL_RX, false); |
| 152 | |
Harald Welte | 02dd911 | 2019-10-01 08:55:29 +0200 | [diff] [blame] | 153 | return cuart->driver->ops->async_tx(cuart, data, len); |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | int card_uart_rx(struct card_uart *cuart, uint8_t *data, size_t len) |
| 157 | { |
| 158 | OSMO_ASSERT(cuart); |
| 159 | OSMO_ASSERT(cuart->driver); |
| 160 | OSMO_ASSERT(cuart->driver->ops); |
| 161 | OSMO_ASSERT(cuart->driver->ops->async_rx); |
| 162 | return cuart->driver->ops->async_rx(cuart, data, len); |
| 163 | } |
| 164 | |
| 165 | void card_uart_set_rx_threshold(struct card_uart *cuart, size_t rx_threshold) |
| 166 | { |
| 167 | cuart->rx_threshold = rx_threshold; |
| 168 | } |
| 169 | |
| 170 | void card_uart_notification(struct card_uart *cuart, enum card_uart_event evt, void *data) |
| 171 | { |
| 172 | OSMO_ASSERT(cuart); |
| 173 | OSMO_ASSERT(cuart->handle_event); |
| 174 | |
| 175 | switch (evt) { |
| 176 | case CUART_E_TX_COMPLETE: |
| 177 | cuart->tx_busy = false; |
| 178 | /* re-enable receiver if we're done with transmit */ |
Harald Welte | 6603d95 | 2019-10-09 20:50:13 +0200 | [diff] [blame] | 179 | if (cuart->rx_after_tx_compl) |
| 180 | card_uart_ctrl(cuart, CUART_CTL_RX, true); |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 181 | break; |
Eric Wild | 2f5cdd1 | 2019-11-27 18:40:44 +0100 | [diff] [blame] | 182 | // case CUART_E_RX_COMPLETE: |
| 183 | // osmo_timer_del(&cuart->wtime_tmr); |
| 184 | // break; |
| 185 | // case CUART_E_RX_SINGLE: |
| 186 | // card_uart_wtime_restart(cuart); |
| 187 | // break; |
Harald Welte | a40c8e5 | 2019-09-27 19:22:34 +0200 | [diff] [blame] | 188 | default: |
| 189 | break; |
| 190 | } |
| 191 | |
| 192 | cuart->handle_event(cuart, evt, data); |
| 193 | } |
| 194 | |
| 195 | int card_uart_driver_register(struct card_uart_driver *drv) |
| 196 | { |
| 197 | OSMO_ASSERT(!cuart_drv_by_name(drv->name)); |
| 198 | OSMO_ASSERT(drv->name); |
| 199 | OSMO_ASSERT(drv->ops); |
| 200 | llist_add_tail(&drv->list, &g_cuart_drivers); |
| 201 | return 0; |
| 202 | } |