blob: 06c304ac6f7da2794d38e380bdd51a8a91736182 [file] [log] [blame]
Linus Walleij394349f2011-11-24 18:27:15 +01001/*
2 * Core driver for the generic pin config portions of the pin control subsystem
3 *
4 * Copyright (C) 2011 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
6 *
7 * Author: Linus Walleij <linus.walleij@linaro.org>
8 *
9 * License terms: GNU General Public License (GPL) version 2
10 */
11
12#define pr_fmt(fmt) "generic pinconfig core: " fmt
13
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/slab.h>
18#include <linux/debugfs.h>
19#include <linux/seq_file.h>
20#include <linux/pinctrl/pinctrl.h>
21#include <linux/pinctrl/pinconf.h>
22#include <linux/pinctrl/pinconf-generic.h>
23#include "core.h"
24#include "pinconf.h"
25
26#ifdef CONFIG_DEBUG_FS
27
28struct pin_config_item {
29 const enum pin_config_param param;
30 const char * const display;
31 const char * const format;
32};
33
34#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
35
36struct pin_config_item conf_items[] = {
37 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
38 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
39 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
40 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
41 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
42 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
43 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
Haojian Zhuangea27c392013-02-12 01:10:57 +080044 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
Linus Walleij394349f2011-11-24 18:27:15 +010045 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
46 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
47 PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
Haojian Zhuang684697c2013-01-18 15:31:15 +080048 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
Linus Walleij394349f2011-11-24 18:27:15 +010049 PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
Linus Walleij483f33f2013-01-04 17:57:40 +010050 PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
Linus Walleij394349f2011-11-24 18:27:15 +010051};
52
53void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
54 struct seq_file *s, unsigned pin)
55{
56 const struct pinconf_ops *ops = pctldev->desc->confops;
57 int i;
58
59 if (!ops->is_generic)
60 return;
61
62 for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
63 unsigned long config;
64 int ret;
65
66 /* We want to check out this parameter */
67 config = pinconf_to_config_packed(conf_items[i].param, 0);
68 ret = pin_config_get_for_pin(pctldev, pin, &config);
69 /* These are legal errors */
70 if (ret == -EINVAL || ret == -ENOTSUPP)
71 continue;
72 if (ret) {
73 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
74 continue;
75 }
76 /* Space between multiple configs */
77 seq_puts(s, " ");
78 seq_puts(s, conf_items[i].display);
79 /* Print unit if available */
80 if (conf_items[i].format &&
81 pinconf_to_config_argument(config) != 0)
82 seq_printf(s, " (%u %s)",
83 pinconf_to_config_argument(config),
84 conf_items[i].format);
85 }
86}
87
88void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
89 struct seq_file *s, const char *gname)
90{
91 const struct pinconf_ops *ops = pctldev->desc->confops;
92 int i;
93
94 if (!ops->is_generic)
95 return;
96
97 for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
98 unsigned long config;
99 int ret;
100
101 /* We want to check out this parameter */
102 config = pinconf_to_config_packed(conf_items[i].param, 0);
103 ret = pin_config_group_get(dev_name(pctldev->dev), gname,
104 &config);
105 /* These are legal errors */
106 if (ret == -EINVAL || ret == -ENOTSUPP)
107 continue;
108 if (ret) {
109 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
110 continue;
111 }
112 /* Space between multiple configs */
113 seq_puts(s, " ");
114 seq_puts(s, conf_items[i].display);
115 /* Print unit if available */
116 if (conf_items[i].format && config != 0)
117 seq_printf(s, " (%u %s)",
118 pinconf_to_config_argument(config),
119 conf_items[i].format);
120 }
121}
122
123#endif