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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_ENABLE, "input schmitt enabled", NULL), |
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"), |
48 | PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL), |
49 | PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"), |
50 | PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"), |
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 |
124 |
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