a73b93157f
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _DEVICE_I2C_H_
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#define _DEVICE_I2C_H_
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#include <stdint.h>
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#include <stdlib.h>
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struct i2c_seg
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{
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int read;
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uint8_t chip;
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uint8_t *buf;
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int len;
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};
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int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count);
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#define SOFTWARE_I2C_MAX_BUS 10 /* increase as necessary */
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struct software_i2c_ops {
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void (*set_sda)(unsigned bus, int high);
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void (*set_scl)(unsigned bus, int high);
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int (*get_sda)(unsigned bus);
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int (*get_scl)(unsigned bus);
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};
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extern struct software_i2c_ops *software_i2c[];
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int software_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count);
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void software_i2c_wedge_ack(unsigned bus, u8 chip);
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void software_i2c_wedge_read(unsigned bus, u8 chip, u8 reg, int bit_count);
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void software_i2c_wedge_write(unsigned bus, u8 chip, u8 reg, int bit_count);
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/*
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* software_i2c is supposed to be a debug feature. It's usually not compiled in,
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* but when it is it can be dynamically enabled at runtime for certain busses.
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* Need this ugly stub to arbitrate since I2C device drivers hardcode
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* 'i2c_transfer()' as their entry point.
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*/
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static inline int i2c_transfer(unsigned bus, struct i2c_seg *segments,
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int count)
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{
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if (CONFIG_SOFTWARE_I2C)
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if (bus < SOFTWARE_I2C_MAX_BUS && software_i2c[bus])
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return software_i2c_transfer(bus, segments, count);
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return platform_i2c_transfer(bus, segments, count);
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}
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/*
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* Read a raw chunk of data in one segment and one frame.
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*
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* [start][slave addr][r][data][stop]
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*/
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static inline int i2c_read_raw(unsigned bus, uint8_t chip, uint8_t *data,
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int len)
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{
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struct i2c_seg seg =
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{ .read = 1, .chip = chip, .buf = data, .len = len };
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return i2c_transfer(bus, &seg, 1);
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}
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/*
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* Write a raw chunk of data in one segment and one frame.
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*
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* [start][slave addr][w][data][stop]
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*/
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static inline int i2c_write_raw(unsigned bus, uint8_t chip, uint8_t *data,
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int len)
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{
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struct i2c_seg seg =
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{ .read = 0, .chip = chip, .buf = data, .len = len };
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return i2c_transfer(bus, &seg, 1);
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}
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/**
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* Read a byte with two segments in one frame
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*
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* [start][slave addr][w][register addr][start][slave addr][r][data][stop]
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*/
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static inline int i2c_readb(unsigned bus, uint8_t chip, uint8_t reg,
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uint8_t *data)
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{
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struct i2c_seg seg[2];
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seg[0].read = 0;
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seg[0].chip = chip;
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seg[0].buf = ®
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seg[0].len = 1;
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seg[1].read = 1;
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seg[1].chip = chip;
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seg[1].buf = data;
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seg[1].len = 1;
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return i2c_transfer(bus, seg, ARRAY_SIZE(seg));
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}
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/**
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* Write a byte with one segment in one frame.
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*
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* [start][slave addr][w][register addr][data][stop]
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*/
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static inline int i2c_writeb(unsigned bus, uint8_t chip, uint8_t reg,
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uint8_t data)
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{
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struct i2c_seg seg;
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uint8_t buf[] = {reg, data};
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seg.read = 0;
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seg.chip = chip;
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seg.buf = buf;
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seg.len = ARRAY_SIZE(buf);
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return i2c_transfer(bus, &seg, 1);
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}
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#endif /* _DEVICE_I2C_H_ */
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