117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
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/*
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* wcxb SPI library
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*
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* Copyright (C) 2013 Digium, Inc.
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*
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* All rights reserved.
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*
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*/
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/*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2 as published by the
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* Free Software Foundation. See the LICENSE file included with
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* this program for more details.
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*/
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#ifndef __WCXB_SPI_H
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#define __WCXB_SPI_H
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#include <linux/spi/spi.h>
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#include <stdbool.h>
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struct wcxb_spi_transfer {
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const void *tx_buf;
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void *rx_buf;
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u32 len:16;
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u16 delay_usecs;
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struct list_head node;
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};
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struct wcxb_spi_message {
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struct list_head transfers;
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struct list_head node;
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struct wcxb_spi_device *spi;
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void (*complete)(void *arg);
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void *arg;
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int status;
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};
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struct wcxb_spi_master;
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struct wcxb_spi_device {
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struct wcxb_spi_master *master;
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u16 chip_select;
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};
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extern struct wcxb_spi_master *wcxb_spi_master_create(struct device *parent,
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void __iomem *base, bool auto_cs);
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extern void wcxb_spi_master_destroy(struct wcxb_spi_master *master);
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extern int wcxb_spi_sync(struct wcxb_spi_device *spi,
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struct wcxb_spi_message *message);
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extern int wcxb_spi_async(struct wcxb_spi_device *spi,
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struct wcxb_spi_message *message);
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extern void wcxb_spi_handle_interrupt(struct wcxb_spi_master *master);
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static inline struct wcxb_spi_device *
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wcxb_spi_device_create(struct wcxb_spi_master *master, u16 chip_select)
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{
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struct wcxb_spi_device *spi = kzalloc(sizeof(*spi), GFP_KERNEL);
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if (!spi)
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return NULL;
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spi->master = master;
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spi->chip_select = chip_select;
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return spi;
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}
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static inline void wcxb_spi_device_destroy(struct wcxb_spi_device *spi)
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{
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kfree(spi);
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}
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static inline void wcxb_spi_message_init(struct wcxb_spi_message *m)
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{
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memset(m, 0, sizeof(*m));
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INIT_LIST_HEAD(&m->transfers);
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}
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static inline void wcxb_spi_message_add_tail(struct wcxb_spi_transfer *t,
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struct wcxb_spi_message *m)
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{
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list_add_tail(&t->node, &m->transfers);
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}
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static inline int
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wcxb_spi_write(struct wcxb_spi_device *spi, const void *buffer, size_t len)
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{
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struct wcxb_spi_transfer t = {
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.tx_buf = buffer,
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.len = len,
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};
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struct wcxb_spi_message m;
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wcxb_spi_message_init(&m);
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wcxb_spi_message_add_tail(&t, &m);
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return wcxb_spi_sync(spi, &m);
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}
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static inline int
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wcxb_spi_read(struct wcxb_spi_device *spi, void *buffer, size_t len)
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{
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struct wcxb_spi_transfer t = {
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.rx_buf = buffer,
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.len = len,
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};
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struct wcxb_spi_message m;
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wcxb_spi_message_init(&m);
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wcxb_spi_message_add_tail(&t, &m);
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return wcxb_spi_sync(spi, &m);
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}
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#endif
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