Loading...
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/module.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 .driver.owner = THIS_MODULE,
135 .probe = tps6586x_gpio_probe,
136};
137
138static int __init tps6586x_gpio_init(void)
139{
140 return platform_driver_register(&tps6586x_gpio_driver);
141}
142subsys_initcall(tps6586x_gpio_init);
143
144static void __exit tps6586x_gpio_exit(void)
145{
146 platform_driver_unregister(&tps6586x_gpio_driver);
147}
148module_exit(tps6586x_gpio_exit);
149
150MODULE_ALIAS("platform:tps6586x-gpio");
151MODULE_DESCRIPTION("GPIO interface for TPS6586X PMIC");
152MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
153MODULE_LICENSE("GPL");
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/module.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 inline struct tps6586x_gpio *to_tps6586x_gpio(struct gpio_chip *chip)
42{
43 return container_of(chip, struct tps6586x_gpio, gpio_chip);
44}
45
46static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
47{
48 struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
49 uint8_t val;
50 int ret;
51
52 ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
53 if (ret)
54 return ret;
55
56 return !!(val & (1 << offset));
57}
58
59static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
60 int value)
61{
62 struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
63
64 tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
65 value << offset, 1 << offset);
66}
67
68static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
69 int value)
70{
71 struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
72 uint8_t val, mask;
73
74 tps6586x_gpio_set(gc, offset, value);
75
76 val = 0x1 << (offset * 2);
77 mask = 0x3 << (offset * 2);
78
79 return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
80 val, mask);
81}
82
83static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
84{
85 struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
86
87 return tps6586x_irq_get_virq(tps6586x_gpio->parent,
88 TPS6586X_INT_PLDO_0 + offset);
89}
90
91static int tps6586x_gpio_probe(struct platform_device *pdev)
92{
93 struct tps6586x_platform_data *pdata;
94 struct tps6586x_gpio *tps6586x_gpio;
95 int ret;
96
97 pdata = dev_get_platdata(pdev->dev.parent);
98 tps6586x_gpio = devm_kzalloc(&pdev->dev,
99 sizeof(*tps6586x_gpio), GFP_KERNEL);
100 if (!tps6586x_gpio) {
101 dev_err(&pdev->dev, "Could not allocate tps6586x_gpio\n");
102 return -ENOMEM;
103 }
104
105 tps6586x_gpio->parent = pdev->dev.parent;
106
107 tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
108 tps6586x_gpio->gpio_chip.label = pdev->name;
109 tps6586x_gpio->gpio_chip.dev = &pdev->dev;
110 tps6586x_gpio->gpio_chip.ngpio = 4;
111 tps6586x_gpio->gpio_chip.can_sleep = true;
112
113 /* FIXME: add handling of GPIOs as dedicated inputs */
114 tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
115 tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
116 tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
117 tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
118
119#ifdef CONFIG_OF_GPIO
120 tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
121#endif
122 if (pdata && pdata->gpio_base)
123 tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
124 else
125 tps6586x_gpio->gpio_chip.base = -1;
126
127 ret = gpiochip_add(&tps6586x_gpio->gpio_chip);
128 if (ret < 0) {
129 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
130 return ret;
131 }
132
133 platform_set_drvdata(pdev, tps6586x_gpio);
134
135 return ret;
136}
137
138static int tps6586x_gpio_remove(struct platform_device *pdev)
139{
140 struct tps6586x_gpio *tps6586x_gpio = platform_get_drvdata(pdev);
141
142 return gpiochip_remove(&tps6586x_gpio->gpio_chip);
143}
144
145static struct platform_driver tps6586x_gpio_driver = {
146 .driver.name = "tps6586x-gpio",
147 .driver.owner = THIS_MODULE,
148 .probe = tps6586x_gpio_probe,
149 .remove = tps6586x_gpio_remove,
150};
151
152static int __init tps6586x_gpio_init(void)
153{
154 return platform_driver_register(&tps6586x_gpio_driver);
155}
156subsys_initcall(tps6586x_gpio_init);
157
158static void __exit tps6586x_gpio_exit(void)
159{
160 platform_driver_unregister(&tps6586x_gpio_driver);
161}
162module_exit(tps6586x_gpio_exit);
163
164MODULE_ALIAS("platform:tps6586x-gpio");
165MODULE_DESCRIPTION("GPIO interface for TPS6586X PMIC");
166MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
167MODULE_LICENSE("GPL");