LXR linux/drivers/pinctrl/pinconf-generic.c

   1/*
   2 * Core driver for the generic pin config portions of the pin control subsystem
   3 *
   4 * Copyright (C) 2011 ST-Ericsson SA
   5 * Written on behalf of Linaro for ST-Ericsson
   6 *
   7 * Author: Linus Walleij <linus.walleij@linaro.org>
   8 *
   9 * License terms: GNU General Public License (GPL) version 2
  10 */
  11
  12#define pr_fmt(fmt) "generic pinconfig core: " fmt
  13
  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>
  24#include "core.h"
  25#include "pinconf.h"
  26
  27#ifdef CONFIG_DEBUG_FS
  28
  29struct pin_config_item {
  30        const enum pin_config_param param;
  31        const char * const display;
  32        const char * const format;
  33};
  34
  35#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
  36
  37static 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_PULL_UP, "input bias pull up", NULL),
  41        PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
  42        PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
  43        PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
  44        PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
  45        PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
  46        PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
  47        PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
  48        PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
  49        PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
  50        PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
  51        PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
  52};
  53
  54void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
  55                              struct seq_file *s, unsigned pin)
  56{
  57        const struct pinconf_ops *ops = pctldev->desc->confops;
  58        int i;
  59
  60        if (!ops->is_generic)
  61                return;
  62
  63        for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
  64                unsigned long config;
  65                int ret;
  66
  67                /* We want to check out this parameter */
  68                config = pinconf_to_config_packed(conf_items[i].param, 0);
  69                ret = pin_config_get_for_pin(pctldev, pin, &config);
  70                /* These are legal errors */
  71                if (ret == -EINVAL || ret == -ENOTSUPP)
  72                        continue;
  73                if (ret) {
  74                        seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
  75                        continue;
  76                }
  77                /* Space between multiple configs */
  78                seq_puts(s, " ");
  79                seq_puts(s, conf_items[i].display);
  80                /* Print unit if available */
  81                if (conf_items[i].format &&
  82                    pinconf_to_config_argument(config) != 0)
  83                        seq_printf(s, " (%u %s)",
  84                                   pinconf_to_config_argument(config),
  85                                   conf_items[i].format);
  86        }
  87}
  88
  89void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
  90                              struct seq_file *s, const char *gname)
  91{
  92        const struct pinconf_ops *ops = pctldev->desc->confops;
  93        int i;
  94
  95        if (!ops->is_generic)
  96                return;
  97
  98        for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
  99                unsigned long config;
 100                int ret;
 101
 102                /* We want to check out this parameter */
 103                config = pinconf_to_config_packed(conf_items[i].param, 0);
 104                ret = pin_config_group_get(dev_name(pctldev->dev), gname,
 105                                           &config);
 106                /* These are legal errors */
 107                if (ret == -EINVAL || ret == -ENOTSUPP)
 108                        continue;
 109                if (ret) {
 110                        seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
 111                        continue;
 112                }
 113                /* Space between multiple configs */
 114                seq_puts(s, " ");
 115                seq_puts(s, conf_items[i].display);
 116                /* Print unit if available */
 117                if (conf_items[i].format && config != 0)
 118                        seq_printf(s, " (%u %s)",
 119                                   pinconf_to_config_argument(config),
 120                                   conf_items[i].format);
 121        }
 122}
 123
 124void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
 125                                 struct seq_file *s, unsigned long config)
 126{
 127        int i;
 128
 129        for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
 130                if (pinconf_to_config_param(config) != conf_items[i].param)
 131                        continue;
 132                seq_printf(s, "%s: 0x%x", conf_items[i].display,
 133                           pinconf_to_config_argument(config));
 134        }
 135}
 136EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
 137#endif
 138