1 /* 2 * I2C - bitbanged generic gpio implementation 3 * 4 * Copyright (C) 2019 - 2020 Andy Green <andy@warmcat.com> 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 22 * IN THE SOFTWARE. 23 * 24 * This is like an abstract class for gpio, a real implementation provides 25 * functions for the ops that use the underlying OS gpio arrangements. 26 */ 27 28 #define LWSBBSPI_FLAG_USE_NCMD3 (1 << 7) 29 #define LWSBBSPI_FLAG_USE_NCMD2 (1 << 6) 30 #define LWSBBSPI_FLAG_USE_NCMD1 (1 << 5) 31 #define LWSBBSPI_FLAG_USE_NCMD0 (1 << 4) 32 #define LWSBBSPI_FLAG_USE_NCS3 (1 << 3) 33 #define LWSBBSPI_FLAG_USE_NCS2 (1 << 2) 34 #define LWSBBSPI_FLAG_USE_NCS1 (1 << 1) 35 #define LWSBBSPI_FLAG_USE_NCS0 (1 << 0) 36 37 #define LWS_SPI_BB_MAX_CH 4 38 39 typedef struct lws_bb_spi { 40 lws_spi_ops_t bb_ops; /* init to lws_bb_spi_ops */ 41 42 /* implementation-specific members */ 43 const lws_gpio_ops_t *gpio; 44 45 _lws_plat_gpio_t clk; 46 _lws_plat_gpio_t ncs[LWS_SPI_BB_MAX_CH]; 47 _lws_plat_gpio_t ncmd[LWS_SPI_BB_MAX_CH]; 48 _lws_plat_gpio_t mosi; 49 _lws_plat_gpio_t miso; 50 51 uint8_t flags; 52 } lws_bb_spi_t; 53 54 #define lws_bb_spi_ops \ 55 .init = lws_bb_spi_init, \ 56 .queue = lws_bb_spi_queue 57 58 int 59 lws_bb_spi_init(const lws_spi_ops_t *octx); 60 61 int 62 lws_bb_spi_queue(const lws_spi_ops_t *octx, const lws_spi_desc_t *desc); 63