1 /*
2 * Philips UCB1400 GPIO driver
3 *
4 * Author: Marek Vasut <marek.vasut@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12 #include <linux/module.h>
13 #include <linux/ucb1400.h>
14
15 struct ucb1400_gpio_data *ucbdata;
16
ucb1400_gpio_dir_in(struct gpio_chip * gc,unsigned off)17 static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
18 {
19 struct ucb1400_gpio *gpio;
20 gpio = container_of(gc, struct ucb1400_gpio, gc);
21 ucb1400_gpio_set_direction(gpio->ac97, off, 0);
22 return 0;
23 }
24
ucb1400_gpio_dir_out(struct gpio_chip * gc,unsigned off,int val)25 static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
26 {
27 struct ucb1400_gpio *gpio;
28 gpio = container_of(gc, struct ucb1400_gpio, gc);
29 ucb1400_gpio_set_direction(gpio->ac97, off, 1);
30 ucb1400_gpio_set_value(gpio->ac97, off, val);
31 return 0;
32 }
33
ucb1400_gpio_get(struct gpio_chip * gc,unsigned off)34 static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
35 {
36 struct ucb1400_gpio *gpio;
37 gpio = container_of(gc, struct ucb1400_gpio, gc);
38 return ucb1400_gpio_get_value(gpio->ac97, off);
39 }
40
ucb1400_gpio_set(struct gpio_chip * gc,unsigned off,int val)41 static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
42 {
43 struct ucb1400_gpio *gpio;
44 gpio = container_of(gc, struct ucb1400_gpio, gc);
45 ucb1400_gpio_set_value(gpio->ac97, off, val);
46 }
47
ucb1400_gpio_probe(struct platform_device * dev)48 static int ucb1400_gpio_probe(struct platform_device *dev)
49 {
50 struct ucb1400_gpio *ucb = dev->dev.platform_data;
51 int err = 0;
52
53 if (!(ucbdata && ucbdata->gpio_offset)) {
54 err = -EINVAL;
55 goto err;
56 }
57
58 platform_set_drvdata(dev, ucb);
59
60 ucb->gc.label = "ucb1400_gpio";
61 ucb->gc.base = ucbdata->gpio_offset;
62 ucb->gc.ngpio = 10;
63 ucb->gc.owner = THIS_MODULE;
64
65 ucb->gc.direction_input = ucb1400_gpio_dir_in;
66 ucb->gc.direction_output = ucb1400_gpio_dir_out;
67 ucb->gc.get = ucb1400_gpio_get;
68 ucb->gc.set = ucb1400_gpio_set;
69 ucb->gc.can_sleep = 1;
70
71 err = gpiochip_add(&ucb->gc);
72 if (err)
73 goto err;
74
75 if (ucbdata && ucbdata->gpio_setup)
76 err = ucbdata->gpio_setup(&dev->dev, ucb->gc.ngpio);
77
78 err:
79 return err;
80
81 }
82
ucb1400_gpio_remove(struct platform_device * dev)83 static int ucb1400_gpio_remove(struct platform_device *dev)
84 {
85 int err = 0;
86 struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
87
88 if (ucbdata && ucbdata->gpio_teardown) {
89 err = ucbdata->gpio_teardown(&dev->dev, ucb->gc.ngpio);
90 if (err)
91 return err;
92 }
93
94 err = gpiochip_remove(&ucb->gc);
95 return err;
96 }
97
98 static struct platform_driver ucb1400_gpio_driver = {
99 .probe = ucb1400_gpio_probe,
100 .remove = ucb1400_gpio_remove,
101 .driver = {
102 .name = "ucb1400_gpio"
103 },
104 };
105
ucb1400_gpio_set_data(struct ucb1400_gpio_data * data)106 void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data)
107 {
108 ucbdata = data;
109 }
110
111 module_platform_driver(ucb1400_gpio_driver);
112
113 MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
114 MODULE_LICENSE("GPL");
115