linux/drivers/pinctrl/pinconf-generic.c
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   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/init.h>
  16#include <linux/device.h>
  17#include <linux/slab.h>
  18#include <linux/debugfs.h>
  19#include <linux/seq_file.h>
  20#include <linux/pinctrl/pinctrl.h>
  21#include <linux/pinctrl/pinconf.h>
  22#include <linux/pinctrl/pinconf-generic.h>
  23#include "core.h"
  24#include "pinconf.h"
  25
  26#ifdef CONFIG_DEBUG_FS
  27
  28struct pin_config_item {
  29        const enum pin_config_param param;
  30        const char * const display;
  31        const char * const format;
  32};
  33
  34#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
  35
  36struct pin_config_item conf_items[] = {
  37        PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
  38        PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
  39        PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
  40        PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
  41        PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
  42        PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
  43        PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
  44        PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
  45        PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
  46        PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
  47        PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
  48        PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
  49        PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
  50        PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
  51};
  52
  53void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
  54                              struct seq_file *s, unsigned pin)
  55{
  56        const struct pinconf_ops *ops = pctldev->desc->confops;
  57        int i;
  58
  59        if (!ops->is_generic)
  60                return;
  61
  62        for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
  63                unsigned long config;
  64                int ret;
  65
  66                /* We want to check out this parameter */
  67                config = pinconf_to_config_packed(conf_items[i].param, 0);
  68                ret = pin_config_get_for_pin(pctldev, pin, &config);
  69                /* These are legal errors */
  70                if (ret == -EINVAL || ret == -ENOTSUPP)
  71                        continue;
  72                if (ret) {
  73                        seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
  74                        continue;
  75                }
  76                /* Space between multiple configs */
  77                seq_puts(s, " ");
  78                seq_puts(s, conf_items[i].display);
  79                /* Print unit if available */
  80                if (conf_items[i].format &&
  81                    pinconf_to_config_argument(config) != 0)
  82                        seq_printf(s, " (%u %s)",
  83                                   pinconf_to_config_argument(config),
  84                                   conf_items[i].format);
  85        }
  86}
  87
  88void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
  89                              struct seq_file *s, const char *gname)
  90{
  91        const struct pinconf_ops *ops = pctldev->desc->confops;
  92        int i;
  93
  94        if (!ops->is_generic)
  95                return;
  96
  97        for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
  98                unsigned long config;
  99                int ret;
 100
 101                /* We want to check out this parameter */
 102                config = pinconf_to_config_packed(conf_items[i].param, 0);
 103                ret = pin_config_group_get(dev_name(pctldev->dev), gname,
 104                                           &config);
 105                /* These are legal errors */
 106                if (ret == -EINVAL || ret == -ENOTSUPP)
 107                        continue;
 108                if (ret) {
 109                        seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
 110                        continue;
 111                }
 112                /* Space between multiple configs */
 113                seq_puts(s, " ");
 114                seq_puts(s, conf_items[i].display);
 115                /* Print unit if available */
 116                if (conf_items[i].format && config != 0)
 117                        seq_printf(s, " (%u %s)",
 118                                   pinconf_to_config_argument(config),
 119                                   conf_items[i].format);
 120        }
 121}
 122
 123#endif
 124
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