gpiomux.h
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/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_H
#define __ARCH_ARM_MACH_MSM_GPIOMUX_H
#include <linux/bitops.h>
#include <linux/errno.h>
#include <mach/msm_gpiomux.h>
#include "gpiomux-v1.h"
/**
* struct msm_gpiomux_config: gpiomux settings for one gpio line.
*
* A complete gpiomux config is the bitwise-or of a drive-strength,
* function, and pull. For functions other than GPIO, the OE
* is hard-wired according to the function. For GPIO mode,
* OE is controlled by gpiolib.
*
* Available settings differ by target; see the gpiomux header
* specific to your target arch for available configurations.
*
* @active: The configuration to be installed when the line is
* active, or its reference count is > 0.
* @suspended: The configuration to be installed when the line
* is suspended, or its reference count is 0.
* @ref: The reference count of the line. For internal use of
* the gpiomux framework only.
*/
struct msm_gpiomux_config {
gpiomux_config_t active;
gpiomux_config_t suspended;
unsigned ref;
};
/**
* @GPIOMUX_VALID: If set, the config field contains 'good data'.
* The absence of this bit will prevent the gpiomux
* system from applying the configuration under all
* circumstances.
*/
enum {
GPIOMUX_VALID = BIT(sizeof(gpiomux_config_t) * BITS_PER_BYTE - 1),
GPIOMUX_CTL_MASK = GPIOMUX_VALID,
};
#ifdef CONFIG_MSM_GPIOMUX
/* Each architecture must provide its own instance of this table.
* To avoid having gpiomux manage any given gpio, one or both of
* the entries can avoid setting GPIOMUX_VALID - the absence
* of that flag will prevent the configuration from being applied
* during state transitions.
*/
extern struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS];
/* Install a new configuration to the gpio line. To avoid overwriting
* a configuration, leave the VALID bit out.
*/
int msm_gpiomux_write(unsigned gpio,
gpiomux_config_t active,
gpiomux_config_t suspended);
#else
static inline int msm_gpiomux_write(unsigned gpio,
gpiomux_config_t active,
gpiomux_config_t suspended)
{
return -ENOSYS;
}
#endif
#endif