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