fixup! ARM: tegra: tps6586x: add empty function direction_input
[linux-3.10.git] / drivers / gpio / gpio-tps6586x.c
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
36 struct tps6586x_gpio {
37         struct gpio_chip gpio_chip;
38         struct device *parent;
39 };
40
41 static inline struct tps6586x_gpio *to_tps6586x_gpio(struct gpio_chip *chip)
42 {
43         return container_of(chip, struct tps6586x_gpio, gpio_chip);
44 }
45
46 static 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
59 static 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
68 static int tps6586x_gpio_input(struct gpio_chip *gc, unsigned offset)
69 {
70         /* FIXME: add handling of GPIOs as dedicated inputs */
71         return -ENOSYS;
72 }
73
74 static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
75                                 int value)
76 {
77         struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
78         uint8_t val, mask;
79         int ret;
80
81         val = value << offset;
82         mask = 0x1 << offset;
83         ret = tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
84                                 val, mask);
85
86         val = 0x1 << (offset * 2);
87         mask = 0x3 << (offset * 2);
88
89         return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
90                                 val, mask);
91 }
92
93 static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
94 {
95         struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
96
97         return tps6586x_irq_get_virq(tps6586x_gpio->parent,
98                                 TPS6586X_INT_PLDO_0 + offset);
99 }
100
101 static int tps6586x_gpio_probe(struct platform_device *pdev)
102 {
103         struct tps6586x_platform_data *pdata;
104         struct tps6586x_gpio *tps6586x_gpio;
105         int ret;
106
107         pdata = dev_get_platdata(pdev->dev.parent);
108         tps6586x_gpio = devm_kzalloc(&pdev->dev,
109                                 sizeof(*tps6586x_gpio), GFP_KERNEL);
110         if (!tps6586x_gpio) {
111                 dev_err(&pdev->dev, "Could not allocate tps6586x_gpio\n");
112                 return -ENOMEM;
113         }
114
115         tps6586x_gpio->parent = pdev->dev.parent;
116
117         tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
118         tps6586x_gpio->gpio_chip.label = pdev->name;
119         tps6586x_gpio->gpio_chip.dev = &pdev->dev;
120         tps6586x_gpio->gpio_chip.ngpio = 4;
121         tps6586x_gpio->gpio_chip.can_sleep = 1;
122
123         tps6586x_gpio->gpio_chip.direction_input = tps6586x_gpio_input;
124         tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
125         tps6586x_gpio->gpio_chip.set    = tps6586x_gpio_set;
126         tps6586x_gpio->gpio_chip.get    = tps6586x_gpio_get;
127         tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
128
129 #ifdef CONFIG_OF_GPIO
130         tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
131 #endif
132         if (pdata && pdata->gpio_base)
133                 tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
134         else
135                 tps6586x_gpio->gpio_chip.base = -1;
136
137         ret = gpiochip_add(&tps6586x_gpio->gpio_chip);
138         if (ret < 0) {
139                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
140                 return ret;
141         }
142
143         platform_set_drvdata(pdev, tps6586x_gpio);
144
145         return ret;
146 }
147
148 static int tps6586x_gpio_remove(struct platform_device *pdev)
149 {
150         struct tps6586x_gpio *tps6586x_gpio = platform_get_drvdata(pdev);
151
152         return gpiochip_remove(&tps6586x_gpio->gpio_chip);
153 }
154
155 static struct platform_driver tps6586x_gpio_driver = {
156         .driver.name    = "tps6586x-gpio",
157         .driver.owner   = THIS_MODULE,
158         .probe          = tps6586x_gpio_probe,
159         .remove         = tps6586x_gpio_remove,
160 };
161
162 static int __init tps6586x_gpio_init(void)
163 {
164         return platform_driver_register(&tps6586x_gpio_driver);
165 }
166 subsys_initcall(tps6586x_gpio_init);
167
168 static void __exit tps6586x_gpio_exit(void)
169 {
170         platform_driver_unregister(&tps6586x_gpio_driver);
171 }
172 module_exit(tps6586x_gpio_exit);
173
174 MODULE_ALIAS("platform:tps6586x-gpio");
175 MODULE_DESCRIPTION("GPIO interface for TPS6586X PMIC");
176 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
177 MODULE_LICENSE("GPL");