blob: 808d44e9a32a03bd1c2dc1e54432721e98a57e94 [file] [log] [blame]
Jim Cromie1ca5df02006-06-27 02:54:19 -07001/* linux/drivers/char/nsc_gpio.c
2
3 National Semiconductor common GPIO device-file/VFS methods.
4 Allows a user space process to control the GPIO pins.
5
6 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
7 Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
8*/
9
Jim Cromie1ca5df02006-06-27 02:54:19 -070010#include <linux/fs.h>
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/nsc_gpio.h>
Jim Cromief31000e2006-06-27 02:54:23 -070016#include <linux/platform_device.h>
Jim Cromie1ca5df02006-06-27 02:54:19 -070017#include <asm/uaccess.h>
18#include <asm/io.h>
19
20#define NAME "nsc_gpio"
21
Jim Cromief31000e2006-06-27 02:54:23 -070022void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index)
Jim Cromie0e41ef32006-06-27 02:54:20 -070023{
Jim Cromief31000e2006-06-27 02:54:23 -070024 /* retrieve current config w/o changing it */
25 u32 config = amp->gpio_config(index, ~0, 0);
26
27 /* user requested via 'v' command, so its INFO */
Jim Cromie23916a82006-06-27 02:54:26 -070028 dev_info(amp->dev, "io%02u: 0x%04x %s %s %s %s %s %s %s\tio:%d/%d\n",
Jim Cromief31000e2006-06-27 02:54:23 -070029 index, config,
30 (config & 1) ? "OE" : "TS", /* output-enabled/tristate */
31 (config & 2) ? "PP" : "OD", /* push pull / open drain */
32 (config & 4) ? "PUE" : "PUD", /* pull up enabled/disabled */
33 (config & 8) ? "LOCKED" : "", /* locked / unlocked */
34 (config & 16) ? "LEVEL" : "EDGE",/* level/edge input */
35 (config & 32) ? "HI" : "LO", /* trigger on rise/fall edge */
Jim Cromie23916a82006-06-27 02:54:26 -070036 (config & 64) ? "DEBOUNCE" : "", /* debounce */
37
38 amp->gpio_get(index), amp->gpio_current(index));
Jim Cromie0e41ef32006-06-27 02:54:20 -070039}
40
Jim Cromie1a66fdf2006-06-27 02:54:20 -070041ssize_t nsc_gpio_write(struct file *file, const char __user *data,
42 size_t len, loff_t *ppos)
43{
Josef Sipeka7113a92006-12-08 02:36:55 -080044 unsigned m = iminor(file->f_path.dentry->d_inode);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070045 struct nsc_gpio_ops *amp = file->private_data;
Jim Cromief31000e2006-06-27 02:54:23 -070046 struct device *dev = amp->dev;
Jim Cromie1a66fdf2006-06-27 02:54:20 -070047 size_t i;
48 int err = 0;
49
50 for (i = 0; i < len; ++i) {
51 char c;
52 if (get_user(c, data + i))
53 return -EFAULT;
54 switch (c) {
55 case '0':
56 amp->gpio_set(m, 0);
57 break;
58 case '1':
59 amp->gpio_set(m, 1);
60 break;
61 case 'O':
Jim Cromief31000e2006-06-27 02:54:23 -070062 dev_dbg(dev, "GPIO%d output enabled\n", m);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070063 amp->gpio_config(m, ~1, 1);
64 break;
65 case 'o':
Jim Cromief31000e2006-06-27 02:54:23 -070066 dev_dbg(dev, "GPIO%d output disabled\n", m);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070067 amp->gpio_config(m, ~1, 0);
68 break;
69 case 'T':
Jim Cromieabecb6d2006-07-14 00:24:26 -070070 dev_dbg(dev, "GPIO%d output is push pull\n", m);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070071 amp->gpio_config(m, ~2, 2);
72 break;
73 case 't':
Jim Cromieabecb6d2006-07-14 00:24:26 -070074 dev_dbg(dev, "GPIO%d output is open drain\n", m);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070075 amp->gpio_config(m, ~2, 0);
76 break;
77 case 'P':
Jim Cromief31000e2006-06-27 02:54:23 -070078 dev_dbg(dev, "GPIO%d pull up enabled\n", m);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070079 amp->gpio_config(m, ~4, 4);
80 break;
81 case 'p':
Jim Cromief31000e2006-06-27 02:54:23 -070082 dev_dbg(dev, "GPIO%d pull up disabled\n", m);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070083 amp->gpio_config(m, ~4, 0);
84 break;
Jim Cromie1a66fdf2006-06-27 02:54:20 -070085 case 'v':
86 /* View Current pin settings */
Jim Cromief31000e2006-06-27 02:54:23 -070087 amp->gpio_dump(amp, m);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070088 break;
89 case '\n':
90 /* end of settings string, do nothing */
91 break;
92 default:
Jim Cromief31000e2006-06-27 02:54:23 -070093 dev_err(dev, "io%2d bad setting: chr<0x%2x>\n",
94 m, (int)c);
Jim Cromie1a66fdf2006-06-27 02:54:20 -070095 err++;
96 }
97 }
98 if (err)
99 return -EINVAL; /* full string handled, report error */
100
101 return len;
102}
103
104ssize_t nsc_gpio_read(struct file *file, char __user * buf,
105 size_t len, loff_t * ppos)
106{
Josef Sipeka7113a92006-12-08 02:36:55 -0800107 unsigned m = iminor(file->f_path.dentry->d_inode);
Jim Cromie1a66fdf2006-06-27 02:54:20 -0700108 int value;
109 struct nsc_gpio_ops *amp = file->private_data;
110
111 value = amp->gpio_get(m);
112 if (put_user(value ? '1' : '0', buf))
113 return -EFAULT;
114
115 return 1;
116}
117
Jim Cromie0e41ef32006-06-27 02:54:20 -0700118/* common file-ops routines for both scx200_gpio and pc87360_gpio */
Jim Cromie1a66fdf2006-06-27 02:54:20 -0700119EXPORT_SYMBOL(nsc_gpio_write);
120EXPORT_SYMBOL(nsc_gpio_read);
Jim Cromie0e41ef32006-06-27 02:54:20 -0700121EXPORT_SYMBOL(nsc_gpio_dump);
Jim Cromie1ca5df02006-06-27 02:54:19 -0700122
123static int __init nsc_gpio_init(void)
124{
125 printk(KERN_DEBUG NAME " initializing\n");
126 return 0;
127}
128
129static void __exit nsc_gpio_cleanup(void)
130{
131 printk(KERN_DEBUG NAME " cleanup\n");
132}
133
Jim Cromie1ca5df02006-06-27 02:54:19 -0700134module_init(nsc_gpio_init);
135module_exit(nsc_gpio_cleanup);
Jim Cromie1a66fdf2006-06-27 02:54:20 -0700136
137MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
138MODULE_DESCRIPTION("NatSemi GPIO Common Methods");
139MODULE_LICENSE("GPL");