1 /* 2 * Copyright (c) 2013 Corey Tabaka 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining 5 * a copy of this software and associated documentation files 6 * (the "Software"), to deal in the Software without restriction, 7 * including without limitation the rights to use, copy, modify, merge, 8 * publish, distribute, sublicense, and/or sell copies of the Software, 9 * and to permit persons to whom the Software is furnished to do so, 10 * subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be 13 * included in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22 */ 23 #ifndef __DEV_CLASS_SPI_H 24 #define __DEV_CLASS_SPI_H 25 26 #include <compiler.h> 27 #include <dev/driver.h> 28 29 /* spi transaction flags */ 30 enum spi_flags { 31 SPI_READ = (1<<0), 32 SPI_WRITE = (1<<1), 33 SPI_CS_ASSERT = (1<<2), 34 SPI_CS_DEASSERT = (1<<3), 35 }; 36 37 /* spi transaction */ 38 struct spi_transaction { 39 enum spi_flags flags; 40 void *tx_buf; 41 void *rx_buf; 42 size_t len; 43 }; 44 45 /* spi interface */ 46 struct spi_ops { 47 struct driver_ops std; 48 49 ssize_t (*transaction)(struct device *dev, struct spi_transaction *txn, size_t count); 50 }; 51 52 __BEGIN_CDECLS 53 54 ssize_t class_spi_transaction(struct device *dev, struct spi_transaction *txn, size_t count); 55 56 __END_CDECLS 57 58 #endif 59 60