2 * Core driver for the generic pin config portions of the pin control subsystem
4 * Copyright (C) 2011 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
7 * Author: Linus Walleij <linus.walleij@linaro.org>
9 * License terms: GNU General Public License (GPL) version 2
12 #define pr_fmt(fmt) "generic pinconfig core: " fmt
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/device.h>
18 #include <linux/slab.h>
19 #include <linux/debugfs.h>
20 #include <linux/seq_file.h>
21 #include <linux/pinctrl/pinctrl.h>
22 #include <linux/pinctrl/pinconf.h>
23 #include <linux/pinctrl/pinconf-generic.h>
27 #ifdef CONFIG_DEBUG_FS
29 struct pin_config_item
{
30 const enum pin_config_param param
;
31 const char * const display
;
32 const char * const format
;
35 #define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
37 static struct pin_config_item conf_items
[] = {
38 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE
, "input bias disabled", NULL
),
39 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE
, "input bias high impedance", NULL
),
40 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD
, "input bias bus hold", NULL
),
41 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP
, "input bias pull up", NULL
),
42 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN
, "input bias pull down", NULL
),
43 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT
,
44 "input bias pull to pin specific state", NULL
),
45 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL
, "output drive push pull", NULL
),
46 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN
, "output drive open drain", NULL
),
47 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE
, "output drive open source", NULL
),
48 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH
, "output drive strength", "mA"),
49 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE
, "input schmitt enabled", NULL
),
50 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT
, "input schmitt trigger", NULL
),
51 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE
, "input debounce", "time units"),
52 PCONFDUMP(PIN_CONFIG_POWER_SOURCE
, "pin power source", "selector"),
53 PCONFDUMP(PIN_CONFIG_SLEW_RATE
, "slew rate", NULL
),
54 PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE
, "pin low power", "mode"),
55 PCONFDUMP(PIN_CONFIG_OUTPUT
, "pin output", "level"),
58 void pinconf_generic_dump_pin(struct pinctrl_dev
*pctldev
,
59 struct seq_file
*s
, unsigned pin
)
61 const struct pinconf_ops
*ops
= pctldev
->desc
->confops
;
67 for (i
= 0; i
< ARRAY_SIZE(conf_items
); i
++) {
71 /* We want to check out this parameter */
72 config
= pinconf_to_config_packed(conf_items
[i
].param
, 0);
73 ret
= pin_config_get_for_pin(pctldev
, pin
, &config
);
74 /* These are legal errors */
75 if (ret
== -EINVAL
|| ret
== -ENOTSUPP
)
78 seq_printf(s
, "ERROR READING CONFIG SETTING %d ", i
);
81 /* Space between multiple configs */
83 seq_puts(s
, conf_items
[i
].display
);
84 /* Print unit if available */
85 if (conf_items
[i
].format
&&
86 pinconf_to_config_argument(config
) != 0)
87 seq_printf(s
, " (%u %s)",
88 pinconf_to_config_argument(config
),
89 conf_items
[i
].format
);
93 void pinconf_generic_dump_group(struct pinctrl_dev
*pctldev
,
94 struct seq_file
*s
, const char *gname
)
96 const struct pinconf_ops
*ops
= pctldev
->desc
->confops
;
102 for (i
= 0; i
< ARRAY_SIZE(conf_items
); i
++) {
103 unsigned long config
;
106 /* We want to check out this parameter */
107 config
= pinconf_to_config_packed(conf_items
[i
].param
, 0);
108 ret
= pin_config_group_get(dev_name(pctldev
->dev
), gname
,
110 /* These are legal errors */
111 if (ret
== -EINVAL
|| ret
== -ENOTSUPP
)
114 seq_printf(s
, "ERROR READING CONFIG SETTING %d ", i
);
117 /* Space between multiple configs */
119 seq_puts(s
, conf_items
[i
].display
);
120 /* Print unit if available */
121 if (conf_items
[i
].format
&& config
!= 0)
122 seq_printf(s
, " (%u %s)",
123 pinconf_to_config_argument(config
),
124 conf_items
[i
].format
);
128 void pinconf_generic_dump_config(struct pinctrl_dev
*pctldev
,
129 struct seq_file
*s
, unsigned long config
)
133 for (i
= 0; i
< ARRAY_SIZE(conf_items
); i
++) {
134 if (pinconf_to_config_param(config
) != conf_items
[i
].param
)
136 seq_printf(s
, "%s: 0x%x", conf_items
[i
].display
,
137 pinconf_to_config_argument(config
));
140 EXPORT_SYMBOL_GPL(pinconf_generic_dump_config
);