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
  29 struct 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
  37 static 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_BUS_HOLD, "input bias bus hold", NULL),
  41         PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
  42         PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
  43         PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
  44                                 "input bias pull to pin specific state", NULL),
  45         PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
  46         PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
  47         PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
  48         PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA"),
  49         PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
  50         PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
  51         PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
  52         PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
  53         PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
  54         PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
  55         PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
  56 };
  57
  58 void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
  59                               struct seq_file *s, unsigned pin)
  60 {
  61         const struct pinconf_ops *ops = pctldev->desc->confops;
  62         int i;
  63
  64         if (!ops->is_generic)
  65                 return;
  66
  67         for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
  68                 unsigned long config;
  69                 int ret;
  70
  71                 /* We want to check out this parameter */
  72                 config = pinconf_to_config_packed(conf_items[i].param, 0);
  73                 ret = pin_config_get_for_pin(pctldev, pin, &config);
  74                 /* These are legal errors */
  75                 if (ret == -EINVAL || ret == -ENOTSUPP)
  76                         continue;
  77                 if (ret) {
  78                         seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
  79                         continue;
  80                 }
  81                 /* Space between multiple configs */
  82                 seq_puts(s, " ");
  83                 seq_puts(s, conf_items[i].display);
  84                 /* Print unit if available */
  85                 if (conf_items[i].format &&
  86                     pinconf_to_config_argument(config) != 0)
  87                         seq_printf(s, " (%u %s)",
  88                                    pinconf_to_config_argument(config),
  89                                    conf_items[i].format);
  90         }
  91 }
  92
  93 void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
  94                               struct seq_file *s, const char *gname)
  95 {
  96         const struct pinconf_ops *ops = pctldev->desc->confops;
  97         int i;
  98
  99         if (!ops->is_generic)
 100                 return;
 101
 102         for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
 103                 unsigned long config;
 104                 int ret;
 105
 106                 /* We want to check out this parameter */
 107                 config = pinconf_to_config_packed(conf_items[i].param, 0);
 108                 ret = pin_config_group_get(dev_name(pctldev->dev), gname,
 109                                            &config);
 110                 /* These are legal errors */
 111                 if (ret == -EINVAL || ret == -ENOTSUPP)
 112                         continue;
 113                 if (ret) {
 114                         seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
 115                         continue;
 116                 }
 117                 /* Space between multiple configs */
 118                 seq_puts(s, " ");
 119                 seq_puts(s, conf_items[i].display);
 120                 /* Print unit if available */
 121                 if (conf_items[i].format && config != 0)
 122                         seq_printf(s, " (%u %s)",
 123                                    pinconf_to_config_argument(config),
 124                                    conf_items[i].format);
 125         }
 126 }
 127
 128 void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
 129                                  struct seq_file *s, unsigned long config)
 130 {
 131         int i;
 132
 133         for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
 134                 if (pinconf_to_config_param(config) != conf_items[i].param)
 135                         continue;
 136                 seq_printf(s, "%s: 0x%x", conf_items[i].display,
 137                            pinconf_to_config_argument(config));
 138         }
 139 }
 140 EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
 141 #endif