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394349f7 LW |
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), | |
2ccb0bcf | 44 | PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_DISABLE, "input schmitt disabled", NULL), |
394349f7 LW |
45 | 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"), | |
684697cb | 48 | PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL), |
394349f7 | 49 | PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"), |
483f33f6 | 50 | PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"), |
394349f7 LW |
51 | }; |
52 | ||
53 | void 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 | ||
88 | void 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 |