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[] = {
	{ "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
	{ "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);

#define MAX_BANK 5
#define BANK_SZ 8

#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)

struct pca953x_chip {
	unsigned gpio_start;
	u8 reg_output[MAX_BANK];
	u8 reg_direction[MAX_BANK];
	struct mutex i2c_lock;

#ifdef CONFIG_GPIO_PCA953X_IRQ
	struct mutex irq_lock;
	u8 irq_mask[MAX_BANK];
	u8 irq_stat[MAX_BANK];
	u8 irq_trig_raise[MAX_BANK];
	u8 irq_trig_fall[MAX_BANK];
	struct irq_domain *domain;
#endif

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

static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
				int off)
{
	int ret;
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int offset = off / BANK_SZ;

	ret = i2c_smbus_read_byte_data(chip->client,
				(reg << bank_shift) + offset);
	*val = ret;

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

	return 0;
}

static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
				int off)
{
	int ret = 0;
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int offset = off / BANK_SZ;

	ret = i2c_smbus_write_byte_data(chip->client,
					(reg << bank_shift) + offset, val);

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

	return 0;
}

static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *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) {
		int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
		ret = i2c_smbus_write_i2c_block_data(chip->client,
					(reg << bank_shift) | REG_ADDR_AI,
					NBANK(chip), val);
	} else {
		switch (chip->chip_type) {
		case PCA953X_TYPE:
			ret