forked from luck/tmp_suning_uos_patched
eee543e824
Let I2C bus segments behind multiplexers have a class. This allows for device auto-detection on these segments. As long as parent segments don't share the same class, it should be fine. I implemented support in drivers i2c-mux-gpio and i2c-mux-pca954x. I left i2c-mux-pca9541 and i2c-mux-pinctrl alone for the moment as I don't know if this feature makes sense for the use cases of these drivers. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Peter Korsgaard <peter.korsgaard@barco.com> Cc: David Daney <david.daney@cavium.com> Cc: Michael Lawnick <ml.lawnick@gmx.de> Cc: Rodolfo Giometti <giometti@linux.it>
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/*
|
|
*
|
|
* pca954x.h - I2C multiplexer/switch support
|
|
*
|
|
* Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it>
|
|
* Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
|
|
* Michael Lawnick <michael.lawnick.ext@nsn.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
|
|
#ifndef _LINUX_I2C_PCA954X_H
|
|
#define _LINUX_I2C_PCA954X_H
|
|
|
|
/* Platform data for the PCA954x I2C multiplexers */
|
|
|
|
/* Per channel initialisation data:
|
|
* @adap_id: bus number for the adapter. 0 = don't care
|
|
* @deselect_on_exit: set this entry to 1, if your H/W needs deselection
|
|
* of this channel after transaction.
|
|
*
|
|
*/
|
|
struct pca954x_platform_mode {
|
|
int adap_id;
|
|
unsigned int deselect_on_exit:1;
|
|
unsigned int class;
|
|
};
|
|
|
|
/* Per mux/switch data, used with i2c_register_board_info */
|
|
struct pca954x_platform_data {
|
|
struct pca954x_platform_mode *modes;
|
|
int num_modes;
|
|
};
|
|
|
|
#endif /* _LINUX_I2C_PCA954X_H */
|