path: root/drivers/gpio/gpio-pca953x.c

/*
 *  PCA953x 4/8/16 bit I/O ports
 *
 *  Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
 *  Copyright (C) 2007 Marvell International Ltd.
 *
 *  Derived from drivers/i2c/chips/pca9539.c
 *
 *  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; version 2 of the License.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/i2c.h>
#include <linux/i2c/pca953x.h>
#include <linux/slab.h>
#ifdef CONFIG_OF_GPIO
#include <linux/of_platform.h>
#endif

#define PCA953X_INPUT		0
#define PCA953X_OUTPUT		1
#define PCA953X_INVERT		2
#define PCA953X_DIRECTION	3

#define REG_ADDR_AI		0x80

#define PCA957X_IN		0
#define PCA957X_INVRT		1
#define PCA957X_BKEN		2
#define PCA957X_PUPD		3
#define PCA957X_CFG		4
#define PCA957X_OUT		5
#define PCA957X_MSK		6
#define PCA957X_INTS		7

#define PCA_GPIO_MASK		0x00FF
#define PCA_INT			0x0100
#define PCA953X_TYPE		0x1000
#define PCA957X_TYPE		0x2000

static const struct i2c_device_id pca953x_id[] = {
	{ "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9536", 4  | PCA953X_TYPE, },
	{ "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
	{ "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9556", 8  | PCA953X_TYPE, },
	{ "pca9557", 8  | PCA953X_TYPE, },
	{ "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
	{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },

	{ "max7310", 8  | PCA953X_TYPE, },
	{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7315", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
	{ "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
	{ "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
	{ "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pca953x_id);

struct pca953x_chip {
	unsigned gpio_start;
	u32 reg_output;
	u32 reg_direction;
	struct mutex i2c_lock;

#ifdef CONFIG_GPIO_PCA953X_IRQ
	struct mutex irq_lock;
	u32 irq_mask;
	u32 irq_stat;
	u32 irq_trig_raise;
	u32 irq_trig_fall;
	int	 irq_base;
	struct irq_domain *domain;
#endif

	struct i2c_client *client;
	struct gpio_chip gpio_chip;
	const char *const *names;
	int	chip_type;
};

static int pca953x_write_reg(struct pca953x_chip *chip, int reg, u32 val)
{
	int ret = 0;

	if (chip->gpio_chip.ngpio <= 8)
		ret = i2c_smbus_write_byte_data(chip->client, reg, val);
	else if (chip->gpio_chip.ngpio == 24) {
		cpu_to_le32s(&val);
		ret = i2c_smbus_write_i2c_block_data(chip->client,
						(reg << 2) | REG_ADDR_AI,
						3,
						(u8 *) &val);
	}
	else {
		switch (chip->chip_type) {
		case PCA953X_TYPE:
			ret = i2c_smbus_write_word_data(chip->client,
							reg << 1, val);
			break;
		case PCA957X_TYPE:
			ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
							val & 0xff);
			if (ret < 0)
				break;
			ret = i2c_smbus_write_byte_data(chip->client,
							(reg << 1) + 1,
							(val & 0xff00) >> 8);
			break;
		}
	}

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed writing register\n");
		return ret;
	}

	return 0;
}

static int pca953x_read_reg(struct pca953x_chip *chip, int reg, u32 *val)
{
	int ret;

	if (chip->gpio_chip.ngpio <= 8) {
		ret = i2c_smbus_read_byte_data(chip->client, reg);
		*val = ret;
	}
	else if (chip->gpio_chip.ngpio == 24) {
		*val = 0;
		ret = i2c_smbus_read_i2c_block_data(chip->client,
						(reg << 2) | REG_ADDR_AI,
						3,
						(u8 *) val);
		le32_to_cpus(val);
	} else {
		ret = i2c_smbus_read_word_data(chip->client, reg << 1);
		*val = ret;
	}

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed reading register\n");
		return ret;
	}

	return 0;
}

static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
{
	struct pca953x_chip *chip;
	uint