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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
4 *
5 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
6 *
7 * Based on the TPS65086 driver
8 *
9 * NOTE: Interrupts are not supported yet.
10 */
11
12#include <linux/gpio/driver.h>
13#include <linux/mfd/rohm-generic.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16
17#include <linux/mfd/bd9571mwv.h>
18
19struct bd9571mwv_gpio {
20 struct regmap *regmap;
21 struct gpio_chip chip;
22};
23
24static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
25 unsigned int offset)
26{
27 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
28 int ret, val;
29
30 ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);
31 if (ret < 0)
32 return ret;
33 if (val & BIT(offset))
34 return GPIO_LINE_DIRECTION_IN;
35
36 return GPIO_LINE_DIRECTION_OUT;
37}
38
39static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
40 unsigned int offset)
41{
42 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
43
44 regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);
45
46 return 0;
47}
48
49static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
50 unsigned int offset, int value)
51{
52 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
53
54 /* Set the initial value */
55 regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
56 BIT(offset), value ? BIT(offset) : 0);
57 regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,
58 BIT(offset), BIT(offset));
59
60 return 0;
61}
62
63static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
64{
65 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
66 int ret, val;
67
68 ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);
69 if (ret < 0)
70 return ret;
71
72 return val & BIT(offset);
73}
74
75static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
76 int value)
77{
78 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
79
80 regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
81 BIT(offset), value ? BIT(offset) : 0);
82}
83
84static const struct gpio_chip template_chip = {
85 .label = "bd9571mwv-gpio",
86 .owner = THIS_MODULE,
87 .get_direction = bd9571mwv_gpio_get_direction,
88 .direction_input = bd9571mwv_gpio_direction_input,
89 .direction_output = bd9571mwv_gpio_direction_output,
90 .get = bd9571mwv_gpio_get,
91 .set = bd9571mwv_gpio_set,
92 .base = -1,
93 .ngpio = 2,
94 .can_sleep = true,
95};
96
97static int bd9571mwv_gpio_probe(struct platform_device *pdev)
98{
99 struct bd9571mwv_gpio *gpio;
100
101 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
102 if (!gpio)
103 return -ENOMEM;
104
105 gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
106 gpio->chip = template_chip;
107 gpio->chip.parent = pdev->dev.parent;
108
109 return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
110}
111
112static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
113 { "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
114 { "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
115 { /* sentinel */ }
116};
117MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
118
119static struct platform_driver bd9571mwv_gpio_driver = {
120 .driver = {
121 .name = "bd9571mwv-gpio",
122 },
123 .probe = bd9571mwv_gpio_probe,
124 .id_table = bd9571mwv_gpio_id_table,
125};
126module_platform_driver(bd9571mwv_gpio_driver);
127
128MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
129MODULE_DESCRIPTION("BD9571MWV GPIO driver");
130MODULE_LICENSE("GPL v2");
1/*
2 * ROHM BD9571MWV-M GPIO driver
3 *
4 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether expressed or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details.
14 *
15 * Based on the TPS65086 driver
16 *
17 * NOTE: Interrupts are not supported yet.
18 */
19
20#include <linux/gpio/driver.h>
21#include <linux/module.h>
22#include <linux/platform_device.h>
23
24#include <linux/mfd/bd9571mwv.h>
25
26struct bd9571mwv_gpio {
27 struct gpio_chip chip;
28 struct bd9571mwv *bd;
29};
30
31static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
32 unsigned int offset)
33{
34 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
35 int ret, val;
36
37 ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
38 if (ret < 0)
39 return ret;
40 if (val & BIT(offset))
41 return GPIO_LINE_DIRECTION_IN;
42
43 return GPIO_LINE_DIRECTION_OUT;
44}
45
46static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
47 unsigned int offset)
48{
49 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
50
51 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
52 BIT(offset), 0);
53
54 return 0;
55}
56
57static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
58 unsigned int offset, int value)
59{
60 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
61
62 /* Set the initial value */
63 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
64 BIT(offset), value ? BIT(offset) : 0);
65 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
66 BIT(offset), BIT(offset));
67
68 return 0;
69}
70
71static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
72{
73 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
74 int ret, val;
75
76 ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
77 if (ret < 0)
78 return ret;
79
80 return val & BIT(offset);
81}
82
83static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
84 int value)
85{
86 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
87
88 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
89 BIT(offset), value ? BIT(offset) : 0);
90}
91
92static const struct gpio_chip template_chip = {
93 .label = "bd9571mwv-gpio",
94 .owner = THIS_MODULE,
95 .get_direction = bd9571mwv_gpio_get_direction,
96 .direction_input = bd9571mwv_gpio_direction_input,
97 .direction_output = bd9571mwv_gpio_direction_output,
98 .get = bd9571mwv_gpio_get,
99 .set = bd9571mwv_gpio_set,
100 .base = -1,
101 .ngpio = 2,
102 .can_sleep = true,
103};
104
105static int bd9571mwv_gpio_probe(struct platform_device *pdev)
106{
107 struct bd9571mwv_gpio *gpio;
108 int ret;
109
110 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
111 if (!gpio)
112 return -ENOMEM;
113
114 platform_set_drvdata(pdev, gpio);
115
116 gpio->bd = dev_get_drvdata(pdev->dev.parent);
117 gpio->chip = template_chip;
118 gpio->chip.parent = gpio->bd->dev;
119
120 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
121 if (ret < 0) {
122 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
123 return ret;
124 }
125
126 return 0;
127}
128
129static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
130 { "bd9571mwv-gpio", },
131 { /* sentinel */ }
132};
133MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
134
135static struct platform_driver bd9571mwv_gpio_driver = {
136 .driver = {
137 .name = "bd9571mwv-gpio",
138 },
139 .probe = bd9571mwv_gpio_probe,
140 .id_table = bd9571mwv_gpio_id_table,
141};
142module_platform_driver(bd9571mwv_gpio_driver);
143
144MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
145MODULE_DESCRIPTION("BD9571MWV GPIO driver");
146MODULE_LICENSE("GPL v2");