/* * 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/module.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 } static 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); } } void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, struct seq_file *s, unsigned long config) { int i; for (i = 0; i < ARRAY_SIZE(conf_items); i++) { if (pinconf_to_config_param(config) != conf_items[i].param) continue; seq_printf(s, "%s: 0x%x", conf_items[i].display, pinconf_to_config_argument(config)); } } EXPORT_SYMBOL_GPL(pinconf_generic_dump_config); #endif