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

/*
 *  PCA953x 4/8/16/24/40 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/acpi.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_data/pca953x.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

#include <asm/unaligned.h>

#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 PCAL953X_IN_LATCH	34
#define PCAL953X_INT_MASK	37
#define PCAL953X_INT_STAT	38

#define PCA_GPIO_MASK		0x00FF
#define PCA_INT			0x0100
#define PCA_PCAL		0x0200
#define PCA953X_TYPE		0x1000
#define PCA957X_TYPE		0x2000
#define PCA_TYPE_MASK		0xF000

#define PCA_CHIP_TYPE(x)	((x) & PCA_TYPE_MASK)

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, },
	{ "pca9698", 40 | PCA953X_TYPE, },

	{ "pcal9555a", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },

	{ "max7310", 8  | PCA953X_TYPE, },
	{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7315", 8  | PCA953X_TYPE | PCA_INT, },
	{ "max7318", 16 | 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, },
	{ "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
	{ "tca9554", 8  | PCA953X_TYPE | PCA_INT, },
	{ "xra1202", 8  | PCA953X_TYPE },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pca953x_id);

static const struct acpi_device_id pca953x_acpi_ids[] = {
	{ "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
	{ }
};
MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);

#define MAX_BANK 5
#define BANK_SZ 8

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

struct pca953x_reg_config {
	int direction;
	int output;
	int input;
};

static const struct pca953x_reg_config pca953x_regs = {
	.direction = PCA953X_DIRECTION,
	.output = PCA953X_OUTPUT,
	.input = PCA953X_INPUT,
};

static const struct pca953x_reg_config pca957x_regs = {
	.direction = PCA957X_CFG,
	.output = PCA957X_OUT,
	.input = PCA957X_IN,
};

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];
#endif

	struct i2c_client *client;
	struct gpio_chip gpio_chip;
	const char *const *names;
	unsigned long driver_data;
	struct regulator *regulator;

	const struct pca953x_reg_config *regs;

	int (*write_regs)(struct pca953x_chip *, int, u8 *);
	int (*read_regs)(struct pca953x_chip *, int, u8 *);
};

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;
	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_8(struct pca953x_chip *chip, int reg, u8 *val)
{
	return i2c_smbus_write_byte_data(chip->client, reg, *val);
}

static int pca953x_write_regs_16(struct pca953x_chip *chip, int