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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);
1/*
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>
27#include <linux/init.h>
28#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
41static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
42{
43 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
44 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{
57 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
58
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{
66 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
67 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
78static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
79{
80 struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
81
82 return tps6586x_irq_get_virq(tps6586x_gpio->parent,
83 TPS6586X_INT_PLDO_0 + offset);
84}
85
86static int tps6586x_gpio_probe(struct platform_device *pdev)
87{
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);
95 if (!tps6586x_gpio)
96 return -ENOMEM;
97
98 tps6586x_gpio->parent = pdev->dev.parent;
99
100 tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
101 tps6586x_gpio->gpio_chip.label = pdev->name;
102 tps6586x_gpio->gpio_chip.parent = &pdev->dev;
103 tps6586x_gpio->gpio_chip.ngpio = 4;
104 tps6586x_gpio->gpio_chip.can_sleep = true;
105
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;
110 tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
111
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
120 ret = devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
121 tps6586x_gpio);
122 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
132static struct platform_driver tps6586x_gpio_driver = {
133 .driver.name = "tps6586x-gpio",
134 .probe = tps6586x_gpio_probe,
135};
136
137static int __init tps6586x_gpio_init(void)
138{
139 return platform_driver_register(&tps6586x_gpio_driver);
140}
141subsys_initcall(tps6586x_gpio_init);