mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
30091404af
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
/* ------------------------------------------------------------------------- */
|
|
/* adap-pcf.h i2c driver algorithms for PCF8584 adapters */
|
|
/* ------------------------------------------------------------------------- */
|
|
/* Copyright (C) 1995-97 Simon G. Vogl
|
|
1998-99 Hans Berglund
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
|
|
Frodo Looijaard <frodol@dds.nl> */
|
|
|
|
#ifndef _LINUX_I2C_ALGO_PCF_H
|
|
#define _LINUX_I2C_ALGO_PCF_H
|
|
|
|
struct i2c_algo_pcf_data {
|
|
void *data; /* private data for lolevel routines */
|
|
void (*setpcf) (void *data, int ctl, int val);
|
|
int (*getpcf) (void *data, int ctl);
|
|
int (*getown) (void *data);
|
|
int (*getclock) (void *data);
|
|
void (*waitforpin) (void *data);
|
|
|
|
void (*xfer_begin) (void *data);
|
|
void (*xfer_end) (void *data);
|
|
|
|
/* Multi-master lost arbitration back-off delay (msecs)
|
|
* This should be set by the bus adapter or knowledgable client
|
|
* if bus is multi-mastered, else zero
|
|
*/
|
|
unsigned long lab_mdelay;
|
|
};
|
|
|
|
int i2c_pcf_add_bus(struct i2c_adapter *);
|
|
|
|
#endif /* _LINUX_I2C_ALGO_PCF_H */
|