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Some I2C bus implementations need to synchronize with external entities, such as system firmware, which might also be programming the same I2C bus. In order to facilitate this add ->xfer_begin() and ->xfer_end() hooks which are invoked around pcf_xfer(). [JD: Make these hooks optional.] Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jean Delvare <khali@linux-fr.org>
49 lines
1.9 KiB
C
49 lines
1.9 KiB
C
/* ------------------------------------------------------------------------- */
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/* adap-pcf.h i2c driver algorithms for PCF8584 adapters */
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/* ------------------------------------------------------------------------- */
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/* Copyright (C) 1995-97 Simon G. Vogl
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1998-99 Hans Berglund
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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; either version 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* ------------------------------------------------------------------------- */
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/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
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Frodo Looijaard <frodol@dds.nl> */
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#ifndef _LINUX_I2C_ALGO_PCF_H
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#define _LINUX_I2C_ALGO_PCF_H
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struct i2c_algo_pcf_data {
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void *data; /* private data for lolevel routines */
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void (*setpcf) (void *data, int ctl, int val);
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int (*getpcf) (void *data, int ctl);
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int (*getown) (void *data);
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int (*getclock) (void *data);
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void (*waitforpin) (void *data);
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void (*xfer_begin) (void *data);
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void (*xfer_end) (void *data);
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/* Multi-master lost arbitration back-off delay (msecs)
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* This should be set by the bus adapter or knowledgable client
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* if bus is multi-mastered, else zero
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*/
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unsigned long lab_mdelay;
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};
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int i2c_pcf_add_bus(struct i2c_adapter *);
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#endif /* _LINUX_I2C_ALGO_PCF_H */
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