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