Root/drivers/pinctrl/pinconf-generic.c

1/*
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),
44    PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
45    PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
46    PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
47    PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
48};
49
50void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
51                  struct seq_file *s, unsigned pin)
52{
53    const struct pinconf_ops *ops = pctldev->desc->confops;
54    int i;
55
56    if (!ops->is_generic)
57        return;
58
59    for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
60        unsigned long config;
61        int ret;
62
63        /* We want to check out this parameter */
64        config = pinconf_to_config_packed(conf_items[i].param, 0);
65        ret = pin_config_get_for_pin(pctldev, pin, &config);
66        /* These are legal errors */
67        if (ret == -EINVAL || ret == -ENOTSUPP)
68            continue;
69        if (ret) {
70            seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
71            continue;
72        }
73        /* Space between multiple configs */
74        seq_puts(s, " ");
75        seq_puts(s, conf_items[i].display);
76        /* Print unit if available */
77        if (conf_items[i].format &&
78            pinconf_to_config_argument(config) != 0)
79            seq_printf(s, " (%u %s)",
80                   pinconf_to_config_argument(config),
81                   conf_items[i].format);
82    }
83}
84
85void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
86                  struct seq_file *s, const char *gname)
87{
88    const struct pinconf_ops *ops = pctldev->desc->confops;
89    int i;
90
91    if (!ops->is_generic)
92        return;
93
94    for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
95        unsigned long config;
96        int ret;
97
98        /* We want to check out this parameter */
99        config = pinconf_to_config_packed(conf_items[i].param, 0);
100        ret = pin_config_group_get(dev_name(pctldev->dev), gname,
101                       &config);
102        /* These are legal errors */
103        if (ret == -EINVAL || ret == -ENOTSUPP)
104            continue;
105        if (ret) {
106            seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
107            continue;
108        }
109        /* Space between multiple configs */
110        seq_puts(s, " ");
111        seq_puts(s, conf_items[i].display);
112        /* Print unit if available */
113        if (conf_items[i].format && config != 0)
114            seq_printf(s, " (%u %s)",
115                   pinconf_to_config_argument(config),
116                   conf_items[i].format);
117    }
118}
119
120#endif
121

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