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Laxman Dewangan72bd9862012-07-18 11:50:48 +05301/*
2 * TI TPS6586x GPIO driver
3 *
4 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
5 * Author: Laxman dewangan <ldewangan@nvidia.com>
6 *
7 * Based on tps6586x.c
8 * Copyright (c) 2010 CompuLab Ltd.
9 * Mike Rapoport <mike@compulab.co.il>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms and conditions of the GNU General Public License,
13 * version 2, as published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
18 * more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24#include <linux/errno.h>
25#include <linux/gpio.h>
26#include <linux/kernel.h>
Paul Gortmakera0e63732016-04-01 14:49:38 -040027#include <linux/init.h>
Laxman Dewangan72bd9862012-07-18 11:50:48 +053028#include <linux/mfd/tps6586x.h>
29#include <linux/of_device.h>
30#include <linux/platform_device.h>
31
32/* GPIO control registers */
33#define TPS6586X_GPIOSET1 0x5d
34#define TPS6586X_GPIOSET2 0x5e
35
36struct tps6586x_gpio {
37 struct gpio_chip gpio_chip;
38 struct device *parent;
39};
40
Laxman Dewangan72bd9862012-07-18 11:50:48 +053041static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
42{
Linus Walleij94a90372015-12-07 14:46:45 +010043 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
Laxman Dewangan72bd9862012-07-18 11:50:48 +053044 uint8_t val;
45 int ret;
46
47 ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
48 if (ret)
49 return ret;
50
51 return !!(val & (1 << offset));
52}
53
54static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
55 int value)
56{
Linus Walleij94a90372015-12-07 14:46:45 +010057 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
Laxman Dewangan72bd9862012-07-18 11:50:48 +053058
59 tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
60 value << offset, 1 << offset);
61}
62
63static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
64 int value)
65{
Linus Walleij94a90372015-12-07 14:46:45 +010066 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
Laxman Dewangan72bd9862012-07-18 11:50:48 +053067 uint8_t val, mask;
68
69 tps6586x_gpio_set(gc, offset, value);
70
71 val = 0x1 << (offset * 2);
72 mask = 0x3 << (offset * 2);
73
74 return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
75 val, mask);
76}
77
Laxman Dewanganfe39f2f2012-11-13 19:18:07 +053078static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
79{
Linus Walleij94a90372015-12-07 14:46:45 +010080 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
Laxman Dewanganfe39f2f2012-11-13 19:18:07 +053081
82 return tps6586x_irq_get_virq(tps6586x_gpio->parent,
83 TPS6586X_INT_PLDO_0 + offset);
84}
85
Bill Pemberton38363092012-11-19 13:22:34 -050086static int tps6586x_gpio_probe(struct platform_device *pdev)
Laxman Dewangan72bd9862012-07-18 11:50:48 +053087{
88 struct tps6586x_platform_data *pdata;
89 struct tps6586x_gpio *tps6586x_gpio;
90 int ret;
91
92 pdata = dev_get_platdata(pdev->dev.parent);
93 tps6586x_gpio = devm_kzalloc(&pdev->dev,
94 sizeof(*tps6586x_gpio), GFP_KERNEL);
Jingoo Hane1ccdb82014-04-29 17:44:48 +090095 if (!tps6586x_gpio)
Laxman Dewangan72bd9862012-07-18 11:50:48 +053096 return -ENOMEM;
Laxman Dewangan72bd9862012-07-18 11:50:48 +053097
98 tps6586x_gpio->parent = pdev->dev.parent;
99
100 tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
101 tps6586x_gpio->gpio_chip.label = pdev->name;
Linus Walleij58383c782015-11-04 09:56:26 +0100102 tps6586x_gpio->gpio_chip.parent = &pdev->dev;
Laxman Dewangan72bd9862012-07-18 11:50:48 +0530103 tps6586x_gpio->gpio_chip.ngpio = 4;
Linus Walleij9fb1f392013-12-04 14:42:46 +0100104 tps6586x_gpio->gpio_chip.can_sleep = true;
Laxman Dewangan72bd9862012-07-18 11:50:48 +0530105
106 /* FIXME: add handling of GPIOs as dedicated inputs */
107 tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
108 tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
109 tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
Laxman Dewanganfe39f2f2012-11-13 19:18:07 +0530110 tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
Laxman Dewangan72bd9862012-07-18 11:50:48 +0530111
112#ifdef CONFIG_OF_GPIO
113 tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
114#endif
115 if (pdata && pdata->gpio_base)
116 tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
117 else
118 tps6586x_gpio->gpio_chip.base = -1;
119
Laxman Dewangan79c676f2016-02-22 17:43:28 +0530120 ret = devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
121 tps6586x_gpio);
Laxman Dewangan72bd9862012-07-18 11:50:48 +0530122 if (ret < 0) {
123 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
124 return ret;
125 }
126
127 platform_set_drvdata(pdev, tps6586x_gpio);
128
129 return ret;
130}
131
Laxman Dewangan72bd9862012-07-18 11:50:48 +0530132static struct platform_driver tps6586x_gpio_driver = {
133 .driver.name = "tps6586x-gpio",
Laxman Dewangan72bd9862012-07-18 11:50:48 +0530134 .probe = tps6586x_gpio_probe,
Laxman Dewangan72bd9862012-07-18 11:50:48 +0530135};
136
137static int __init tps6586x_gpio_init(void)
138{
139 return platform_driver_register(&tps6586x_gpio_driver);
140}
141subsys_initcall(tps6586x_gpio_init);