1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * TI TPS6586x GPIO driver
  4 *
  5 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
  6 * Author: Laxman dewangan <ldewangan@nvidia.com>
  7 *
  8 * Based on tps6586x.c
  9 * Copyright (c) 2010 CompuLab Ltd.
 10 * Mike Rapoport <mike@compulab.co.il>
 11 */
 12
 13#include <linux/errno.h>
 14#include <linux/gpio/driver.h>
 15#include <linux/kernel.h>
 16#include <linux/init.h>
 17#include <linux/mfd/tps6586x.h>
 18#include <linux/of_device.h>
 19#include <linux/platform_device.h>
 20
 21/* GPIO control registers */
 22#define TPS6586X_GPIOSET1	0x5d
 23#define TPS6586X_GPIOSET2	0x5e
 24
 25struct tps6586x_gpio {
 26	struct gpio_chip gpio_chip;
 27	struct device *parent;
 28};
 29
 30static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
 31{
 32	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
 33	uint8_t val;
 34	int ret;
 35
 36	ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
 37	if (ret)
 38		return ret;
 39
 40	return !!(val & (1 << offset));
 41}
 42
 43static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
 44			      int value)
 45{
 46	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
 47
 48	tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
 49			value << offset, 1 << offset);
 50}
 51
 52static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
 53				int value)
 54{
 55	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
 56	uint8_t val, mask;
 57
 58	tps6586x_gpio_set(gc, offset, value);
 59
 60	val = 0x1 << (offset * 2);
 61	mask = 0x3 << (offset * 2);
 62
 63	return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
 64				val, mask);
 65}
 66
 67static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 68{
 69	struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
 70
 71	return tps6586x_irq_get_virq(tps6586x_gpio->parent,
 72				TPS6586X_INT_PLDO_0 + offset);
 73}
 74
 75static int tps6586x_gpio_probe(struct platform_device *pdev)
 76{
 77	struct tps6586x_platform_data *pdata;
 78	struct tps6586x_gpio *tps6586x_gpio;
 79
 80	device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
 81
 82	pdata = dev_get_platdata(pdev->dev.parent);
 83	tps6586x_gpio = devm_kzalloc(&pdev->dev,
 84				sizeof(*tps6586x_gpio), GFP_KERNEL);
 85	if (!tps6586x_gpio)
 86		return -ENOMEM;
 87
 88	tps6586x_gpio->parent = pdev->dev.parent;
 89
 90	tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
 91	tps6586x_gpio->gpio_chip.label = pdev->name;
 92	tps6586x_gpio->gpio_chip.parent = &pdev->dev;
 93	tps6586x_gpio->gpio_chip.ngpio = 4;
 94	tps6586x_gpio->gpio_chip.can_sleep = true;
 95
 96	/* FIXME: add handling of GPIOs as dedicated inputs */
 97	tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
 98	tps6586x_gpio->gpio_chip.set	= tps6586x_gpio_set;
 99	tps6586x_gpio->gpio_chip.get	= tps6586x_gpio_get;
100	tps6586x_gpio->gpio_chip.to_irq	= tps6586x_gpio_to_irq;
101
102	if (pdata && pdata->gpio_base)
103		tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
104	else
105		tps6586x_gpio->gpio_chip.base = -1;
106
107	return devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
108				      tps6586x_gpio);
109}
110
111static struct platform_driver tps6586x_gpio_driver = {
112	.driver.name	= "tps6586x-gpio",
113	.probe		= tps6586x_gpio_probe,
114};
115
116static int __init tps6586x_gpio_init(void)
117{
118	return platform_driver_register(&tps6586x_gpio_driver);
119}
120subsys_initcall(tps6586x_gpio_init);