nes-proj/platform/galileo/drivers/gpio-pcal9535a.h
Ricardo de Almeida Gonzaga 495dcd659a x86: Add PCAL9535A support
This patch adds gpio-pcal9535a.c and gpio-pcal9535a.h files,
which support access to I2C-based PCAL9535A GPIO controller
configuration register through a function interface.

The PCAL9535A is a low-voltage 16-bit GPIO expander with interrupt
and reset for I2C-bus/SMBus applications. It contains the PCA9535
register set of four pairs of 8-bit Configuration, Input, Output,
and Polarity Inversion registers, and additionally, the PCAL9535A has
Agile I/O, which are additional features specifically designed to
enhance the I/O. More about PCAL9535A can be found in its datasheet[1].

This driver is needed in order to configure Galileo pinmux.

[1] - http://www.nxp.com/documents/data_sheet/PCAL9535A.pdf
2015-12-21 08:06:14 -02:00

66 lines
2.7 KiB
C

/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CPU_X86_DRIVERS_GPIO_PCAL9535A_H_
#define CPU_X86_DRIVERS_GPIO_PCAL9535A_H_
#include <stdint.h>
union gpio_pcal9535a_port_data {
uint16_t all;
uint8_t port[2];
uint8_t byte[2];
};
struct gpio_pcal9535a_data {
uint16_t i2c_slave_addr;
uint32_t out_pol_inv;
struct {
union gpio_pcal9535a_port_data output;
union gpio_pcal9535a_port_data pol_inv;
union gpio_pcal9535a_port_data dir;
union gpio_pcal9535a_port_data pud_en;
union gpio_pcal9535a_port_data pud_sel;
} reg_cache;
};
int gpio_pcal9535a_init(struct gpio_pcal9535a_data *data, uint16_t i2c_slave_addr);
int gpio_pcal9535a_config(struct gpio_pcal9535a_data *data, uint32_t pin, int flags);
int gpio_pcal9535a_read(struct gpio_pcal9535a_data *data, uint32_t pin, uint32_t *value);
int gpio_pcal9535a_write(struct gpio_pcal9535a_data *data, uint32_t pin, uint32_t value);
int gpio_pcal9535a_config_port(struct gpio_pcal9535a_data *data, uint32_t pin, int flags);
int gpio_pcal9535a_read_port(struct gpio_pcal9535a_data *data, uint32_t pin, uint32_t *value);
int gpio_pcal9535a_write_port(struct gpio_pcal9535a_data *data, uint32_t pin, uint32_t value);
#endif /* CPU_X86_DRIVERS_GPIO_PCAL9535A_H_ */