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