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/*
* Core driver for the generic pin config portions of the pin control subsystem
*
* Copyright (C) 2011 ST-Ericsson SA
* Written on behalf of Linaro for ST-Ericsson
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
* License terms: GNU General Public License (GPL) version 2
*/
#define pr_fmt(fmt) "generic pinconfig core: " fmt
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include "core.h"
#include "pinconf.h"
#ifdef CONFIG_DEBUG_FS
struct pin_config_item {
const enum pin_config_param param;
const char * const display;
const char * const format;
};
#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
struct pin_config_item conf_items[] = {
PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
};
void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned pin)
{
const struct pinconf_ops *ops = pctldev->desc->confops;
int i;
if (!ops->is_generic)
return;
for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
unsigned long config;
int ret;
/* We want to check out this parameter */
config = pinconf_to_config_packed(conf_items[i].param, 0);
ret = pin_config_get_for_pin(pctldev, pin, &config);
/* These are legal errors */
if (ret == -EINVAL || ret == -ENOTSUPP)
continue;
if (ret) {
seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
continue;
}
/* Space between multiple configs */
seq_puts(s, " ");
seq_puts(s, conf_items[i].display);
/* Print unit if available */
if (conf_items[i].format &&
pinconf_to_config_argument(config) != 0)
seq_printf(s, " (%u %s)",
pinconf_to_config_argument(config),
conf_items[i].format);
}
}
void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
struct seq_file *s, const char *gname)
{
const struct pinconf_ops *ops = pctldev->desc->confops;
int i;
if (!ops->is_generic)
return;
for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
unsigned long config;
int ret;
/* We want to check out this parameter */
config = pinconf_to_config_packed(conf_items[i].param, 0);
ret = pin_config_group_get(dev_name(pctldev->dev), gname,
&config);
/* These are legal errors */
if (ret == -EINVAL || ret == -ENOTSUPP)
continue;
if (ret) {
seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
continue;
}
/* Space between multiple configs */
seq_puts(s, " ");
seq_puts(s, conf_items[i].display);
/* Print unit if available */
if (conf_items[i].format && config != 0)
seq_printf(s, " (%u %s)",
pinconf_to_config_argument(config),
conf_items[i].format);
}
}
#endif
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