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	int ret;
80
81	pdata = dev_get_platdata(pdev->dev.parent);
82	tps6586x_gpio = devm_kzalloc(&pdev->dev,
83				sizeof(*tps6586x_gpio), GFP_KERNEL);
84	if (!tps6586x_gpio)
85		return -ENOMEM;
86
87	tps6586x_gpio->parent = pdev->dev.parent;
88
89	tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
90	tps6586x_gpio->gpio_chip.label = pdev->name;
91	tps6586x_gpio->gpio_chip.parent = &pdev->dev;
92	tps6586x_gpio->gpio_chip.ngpio = 4;
93	tps6586x_gpio->gpio_chip.can_sleep = true;
94
95	/* FIXME: add handling of GPIOs as dedicated inputs */
96	tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
97	tps6586x_gpio->gpio_chip.set	= tps6586x_gpio_set;
98	tps6586x_gpio->gpio_chip.get	= tps6586x_gpio_get;
99	tps6586x_gpio->gpio_chip.to_irq	= tps6586x_gpio_to_irq;
100
101#ifdef CONFIG_OF_GPIO
102	tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
103#endif
104	if (pdata && pdata->gpio_base)
105		tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
106	else
107		tps6586x_gpio->gpio_chip.base = -1;
108
109	ret = devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
110				     tps6586x_gpio);
111	if (ret < 0) {
112		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
113		return ret;
114	}
115
116	platform_set_drvdata(pdev, tps6586x_gpio);
117
118	return ret;
119}
120
121static struct platform_driver tps6586x_gpio_driver = {
122	.driver.name	= "tps6586x-gpio",
123	.probe		= tps6586x_gpio_probe,
124};
125
126static int __init tps6586x_gpio_init(void)
127{
128	return platform_driver_register(&tps6586x_gpio_driver);
129}
130subsys_initcall(tps6586x_gpio_init);
131