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>
28 #ifdef CONFIG_DEBUG_FS
30 struct pin_config_item
{
31 const enum pin_config_param param
;
32 const char * const display
;
33 const char * const format
;
36 #define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
38 static struct pin_config_item conf_items
[] = {
39 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE
, "input bias disabled", NULL
),
40 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE
, "input bias high impedance", NULL
),
41 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD
, "input bias bus hold", NULL
),
42 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP
, "input bias pull up", NULL
),
43 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN
, "input bias pull down", NULL
),
44 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT
,
45 "input bias pull to pin specific state", NULL
),
46 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL
, "output drive push pull", NULL
),
47 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN
, "output drive open drain", NULL
),
48 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE
, "output drive open source", NULL
),
49 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH
, "output drive strength", "mA"),
50 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE
, "input schmitt enabled", NULL
),
51 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT
, "input schmitt trigger", NULL
),
52 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE
, "input debounce", "time units"),
53 PCONFDUMP(PIN_CONFIG_POWER_SOURCE
, "pin power source", "selector"),
54 PCONFDUMP(PIN_CONFIG_SLEW_RATE
, "slew rate", NULL
),
55 PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE
, "pin low power", "mode"),
56 PCONFDUMP(PIN_CONFIG_OUTPUT
, "pin output", "level"),
59 void pinconf_generic_dump_pin(struct pinctrl_dev
*pctldev
,
60 struct seq_file
*s
, unsigned pin
)
62 const struct pinconf_ops
*ops
= pctldev
->desc
->confops
;
68 for (i
= 0; i
< ARRAY_SIZE(conf_items
); i
++) {
72 /* We want to check out this parameter */
73 config
= pinconf_to_config_packed(conf_items
[i
].param
, 0);
74 ret
= pin_config_get_for_pin(pctldev
, pin
, &config
);
75 /* These are legal errors */
76 if (ret
== -EINVAL
|| ret
== -ENOTSUPP
)
79 seq_printf(s
, "ERROR READING CONFIG SETTING %d ", i
);
82 /* Space between multiple configs */
84 seq_puts(s
, conf_items
[i
].display
);
85 /* Print unit if available */
86 if (conf_items
[i
].format
&&
87 pinconf_to_config_argument(config
) != 0)
88 seq_printf(s
, " (%u %s)",
89 pinconf_to_config_argument(config
),
90 conf_items
[i
].format
);
94 void pinconf_generic_dump_group(struct pinctrl_dev
*pctldev
,
95 struct seq_file
*s
, const char *gname
)
97 const struct pinconf_ops
*ops
= pctldev
->desc
->confops
;
100 if (!ops
->is_generic
)
103 for (i
= 0; i
< ARRAY_SIZE(conf_items
); i
++) {
104 unsigned long config
;
107 /* We want to check out this parameter */
108 config
= pinconf_to_config_packed(conf_items
[i
].param
, 0);
109 ret
= pin_config_group_get(dev_name(pctldev
->dev
), gname
,
111 /* These are legal errors */
112 if (ret
== -EINVAL
|| ret
== -ENOTSUPP
)
115 seq_printf(s
, "ERROR READING CONFIG SETTING %d ", i
);
118 /* Space between multiple configs */
120 seq_puts(s
, conf_items
[i
].display
);
121 /* Print unit if available */
122 if (conf_items
[i
].format
&& config
!= 0)
123 seq_printf(s
, " (%u %s)",
124 pinconf_to_config_argument(config
),
125 conf_items
[i
].format
);
129 void pinconf_generic_dump_config(struct pinctrl_dev
*pctldev
,
130 struct seq_file
*s
, unsigned long config
)
134 for (i
= 0; i
< ARRAY_SIZE(conf_items
); i
++) {
135 if (pinconf_to_config_param(config
) != conf_items
[i
].param
)
137 seq_printf(s
, "%s: 0x%x", conf_items
[i
].display
,
138 pinconf_to_config_argument(config
));
141 EXPORT_SYMBOL_GPL(pinconf_generic_dump_config
);
145 struct pinconf_generic_dt_params
{
146 const char * const property
;
147 enum pin_config_param param
;
151 static struct pinconf_generic_dt_params dt_params
[] = {
152 { "bias-disable", PIN_CONFIG_BIAS_DISABLE
, 0 },
153 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE
, 0 },
154 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD
, 0 },
155 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP
, 1 },
156 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN
, 1 },
157 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT
, 1 },
158 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL
, 0 },
159 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN
, 0 },
160 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE
, 0 },
161 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH
, 0 },
162 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE
, 1 },
163 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE
, 0 },
164 { "input-schmitt", PIN_CONFIG_INPUT_SCHMITT
, 0 },
165 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE
, 0 },
166 { "power-source", PIN_CONFIG_POWER_SOURCE
, 0 },
167 { "slew-rate", PIN_CONFIG_SLEW_RATE
, 0 },
168 { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE
, 1 },
169 { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE
, 0 },
170 { "output-low", PIN_CONFIG_OUTPUT
, 0, },
171 { "output-high", PIN_CONFIG_OUTPUT
, 1, },
175 * pinconf_generic_parse_dt_config()
176 * parse the config properties into generic pinconfig values.
177 * @np: node containing the pinconfig properties
178 * @configs: array with nconfigs entries containing the generic pinconf values
179 * @nconfigs: umber of configurations
181 int pinconf_generic_parse_dt_config(struct device_node
*np
,
182 unsigned long **configs
,
183 unsigned int *nconfigs
)
185 unsigned long cfg
[ARRAY_SIZE(dt_params
)];
186 unsigned int ncfg
= 0;
194 for (i
= 0; i
< ARRAY_SIZE(dt_params
); i
++) {
195 struct pinconf_generic_dt_params
*par
= &dt_params
[i
];
196 ret
= of_property_read_u32(np
, par
->property
, &val
);
198 /* property not found */
202 /* use default value, when no value is specified */
204 val
= par
->default_value
;
206 pr_debug("found %s with value %u\n", par
->property
, val
);
207 cfg
[ncfg
] = pinconf_to_config_packed(par
->param
, val
);
211 /* no configs found at all */
219 * Now limit the number of configs to the real number of
222 *configs
= kzalloc(ncfg
* sizeof(unsigned long), GFP_KERNEL
);
226 memcpy(*configs
, &cfg
, ncfg
* sizeof(unsigned long));