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_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
  54 void 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
  89 void 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
 124 void 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 }
 136 EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
 137 #endif