[people/ms/u-boot.git] / drivers / gpio / pca9698.c

/*
 * (C) Copyright 2011
 * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Driver for NXP's pca9698 40 bit I2C gpio expander
 */

#include <common.h>
#include <i2c.h>
#include <asm/errno.h>
#include <pca9698.h>

/*
 * The pca9698 registers
 */

#define PCA9698_REG_INPUT		0x00
#define PCA9698_REG_OUTPUT		0x08
#define PCA9698_REG_POLARITY		0x10
#define PCA9698_REG_CONFIG		0x18

#define PCA9698_BUFFER_SIZE		5
#define PCA9698_GPIO_COUNT		40

static int pca9698_read40(u8 addr, u8 offset, u8 *buffer)
{
	u8 command = offset | 0x80;  /* autoincrement */

	return i2c_read(addr, command, 1, buffer, PCA9698_BUFFER_SIZE);
}

static int pca9698_write40(u8 addr, u8 offset, u8 *buffer)
{
	u8 command = offset | 0x80;  /* autoincrement */

	return i2c_write(addr, command, 1, buffer, PCA9698_BUFFER_SIZE);
}

static void pca9698_set_bit(unsigned gpio, u8 *buffer, unsigned value)
{
	unsigned byte = gpio / 8;
	unsigned bit = gpio % 8;

	if (value)
		buffer[byte] |= (1 << bit);
	else
		buffer[byte] &= ~(1 << bit);
}

int pca9698_request(unsigned gpio, const char *label)
{
	if (gpio >= PCA9698_GPIO_COUNT)
		return -EINVAL;

	return 0;
}

void pca9698_free(unsigned gpio)
{
}

int pca9698_direction_input(u8 addr, unsigned gpio)
{
	u8 data[PCA9698_BUFFER_SIZE];
	int res;

	res = pca9698_read40(addr, PCA9698_REG_CONFIG, data);
	if (res)
		return res;

	pca9698_set_bit(gpio, data, 1);

	return pca9698_write40(addr, PCA9698_REG_CONFIG, data);
}

int pca9698_direction_output(u8 addr, unsigned gpio, int value)
{
	u8 data[PCA9698_BUFFER_SIZE];
	int res;

	res = pca9698_set_value(addr, gpio, value);
	if (res)
		return res;

	res = pca9698_read40(addr, PCA9698_REG_CONFIG, data);
	if (res)
		return res;

	pca9698_set_bit(gpio, data, 0);

	return pca9698_write40(addr, PCA9698_REG_CONFIG, data);
}

int pca9698_get_value(u8 addr, unsigned gpio)
{
	unsigned config_byte = gpio / 8;
	unsigned config_bit = gpio % 8;
	unsigned value;
	u8 data[PCA9698_BUFFER_SIZE];
	int res;

	res = pca9698_read40(addr, PCA9698_REG_INPUT, data);
	if (res)
		return -1;

	value = data[config_byte] & (1 << config_bit);

	return !!value;
}

int pca9698_set_value(u8 addr, unsigned gpio, int value)
{
	u8 data[PCA9698_BUFFER_SIZE];
	int res;

	res = pca9698_read40(addr, PCA9698_REG_OUTPUT, data);
	if (res)
		return res;

	pca9698_set_bit(gpio, data, value);

	return pca9698_write40(addr, PCA9698_REG_OUTPUT, data);
}
Commit	Line	Data
486cad03 DE	1	/*
	2	* (C) Copyright 2011
	3	* Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
486cad03 DE	6	*/
	7
	8	/*
	9	* Driver for NXP's pca9698 40 bit I2C gpio expander
	10	*/
	11
	12	#include <common.h>
	13	#include <i2c.h>
042f9f10	14	#include <asm/errno.h>
486cad03 DE	15	#include <pca9698.h>
	16
	17	/*
	18	* The pca9698 registers
	19	*/
	20
	21	#define PCA9698_REG_INPUT 0x00
	22	#define PCA9698_REG_OUTPUT 0x08
	23	#define PCA9698_REG_POLARITY 0x10
	24	#define PCA9698_REG_CONFIG 0x18
	25
	26	#define PCA9698_BUFFER_SIZE 5
042f9f10	27	#define PCA9698_GPIO_COUNT 40
486cad03	28
042f9f10	29	static int pca9698_read40(u8 addr, u8 offset, u8 *buffer)
486cad03 DE	30	{
	31	u8 command = offset \| 0x80; /* autoincrement */
	32
042f9f10	33	return i2c_read(addr, command, 1, buffer, PCA9698_BUFFER_SIZE);
486cad03 DE	34	}
486cad03 DE	35
042f9f10	36	static int pca9698_write40(u8 addr, u8 offset, u8 *buffer)
486cad03 DE	37	{
	38	u8 command = offset \| 0x80; /* autoincrement */
	39
042f9f10	40	return i2c_write(addr, command, 1, buffer, PCA9698_BUFFER_SIZE);
486cad03 DE	41	}
	42
	43	static void pca9698_set_bit(unsigned gpio, u8 *buffer, unsigned value)
	44	{
	45	unsigned byte = gpio / 8;
	46	unsigned bit = gpio % 8;
	47
	48	if (value)
	49	buffer[byte] \|= (1 << bit);
	50	else
	51	buffer[byte] &= ~(1 << bit);
	52	}
	53
042f9f10 DE	54	int pca9698_request(unsigned gpio, const char *label)
	55	{
	56	if (gpio >= PCA9698_GPIO_COUNT)
	57	return -EINVAL;
	58
	59	return 0;
	60	}
	61
	62	void pca9698_free(unsigned gpio)
	63	{
	64	}
	65
	66	int pca9698_direction_input(u8 addr, unsigned gpio)
486cad03 DE	67	{
	68	u8 data[PCA9698_BUFFER_SIZE];
	69	int res;
	70
042f9f10	71	res = pca9698_read40(addr, PCA9698_REG_CONFIG, data);
486cad03 DE	72	if (res)
	73	return res;
	74
042f9f10 DE	75	pca9698_set_bit(gpio, data, 1);
	76
	77	return pca9698_write40(addr, PCA9698_REG_CONFIG, data);
486cad03 DE	78	}
486cad03 DE	79
042f9f10	80	int pca9698_direction_output(u8 addr, unsigned gpio, int value)
486cad03 DE	81	{
	82	u8 data[PCA9698_BUFFER_SIZE];
	83	int res;
	84
042f9f10 DE	85	res = pca9698_set_value(addr, gpio, value);
	86	if (res)
	87	return res;
	88
	89	res = pca9698_read40(addr, PCA9698_REG_CONFIG, data);
486cad03 DE	90	if (res)
	91	return res;
	92
042f9f10 DE	93	pca9698_set_bit(gpio, data, 0);
	94
	95	return pca9698_write40(addr, PCA9698_REG_CONFIG, data);
486cad03 DE	96	}
486cad03 DE	97
042f9f10	98	int pca9698_get_value(u8 addr, unsigned gpio)
486cad03	99	{
042f9f10 DE	100	unsigned config_byte = gpio / 8;
042f9f10 DE	101	unsigned config_bit = gpio % 8;
486cad03 DE	102	unsigned value;
	103	u8 data[PCA9698_BUFFER_SIZE];
	104	int res;
	105
042f9f10	106	res = pca9698_read40(addr, PCA9698_REG_INPUT, data);
486cad03 DE	107	if (res)
	108	return -1;
	109
	110	value = data[config_byte] & (1 << config_bit);
	111
	112	return !!value;
	113	}
	114
042f9f10	115	int pca9698_set_value(u8 addr, unsigned gpio, int value)
486cad03 DE	116	{
	117	u8 data[PCA9698_BUFFER_SIZE];
	118	int res;
	119
042f9f10	120	res = pca9698_read40(addr, PCA9698_REG_OUTPUT, data);
486cad03 DE	121	if (res)
	122	return res;
	123
042f9f10 DE	124	pca9698_set_bit(gpio, data, value);
	125
	126	return pca9698_write40(addr, PCA9698_REG_OUTPUT, data);
486cad03	127	}