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
28 struct 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
36 struct 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
pinconf_generic_dump_pin(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned pin)50 void 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
pinconf_generic_dump_group(struct pinctrl_dev * pctldev,struct seq_file * s,const char * gname)85 void 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