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/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
  28 struct 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
  36 struct 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, "input schmitt trigger", NULL),
  45         PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "time units"),
  46         PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
  47         PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
  48 };
  49
  50 void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
  51                               struct seq_file *s, unsigned pin)
  52 {
  53         const struct pinconf_ops *ops = pctldev->desc->confops;
  54         int i;
  55
  56         if (!ops->is_generic)
  57                 return;
  58
  59         for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
  60                 unsigned long config;
  61                 int ret;
  62
  63                 /* We want to check out this parameter */
  64                 config = pinconf_to_config_packed(conf_items[i].param, 0);
  65                 ret = pin_config_get_for_pin(pctldev, pin, &config);
  66                 /* These are legal errors */
  67                 if (ret == -EINVAL || ret == -ENOTSUPP)
  68                         continue;
  69                 if (ret) {
  70                         seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
  71                         continue;
  72                 }
  73                 /* Space between multiple configs */
  74                 seq_puts(s, " ");
  75                 seq_puts(s, conf_items[i].display);
  76                 /* Print unit if available */
  77                 if (conf_items[i].format &&
  78                     pinconf_to_config_argument(config) != 0)
  79                         seq_printf(s, " (%u %s)",
  80                                    pinconf_to_config_argument(config),
  81                                    conf_items[i].format);
  82         }
  83 }
  84
  85 void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
  86                               struct seq_file *s, const char *gname)
  87 {
  88         const struct pinconf_ops *ops = pctldev->desc->confops;
  89         int i;
  90
  91         if (!ops->is_generic)
  92                 return;
  93
  94         for(i = 0; i < ARRAY_SIZE(conf_items); i++) {
  95                 unsigned long config;
  96                 int ret;
  97
  98                 /* We want to check out this parameter */
  99                 config = pinconf_to_config_packed(conf_items[i].param, 0);
 100                 ret = pin_config_group_get(dev_name(pctldev->dev), gname,
 101                                            &config);
 102                 /* These are legal errors */
 103                 if (ret == -EINVAL || ret == -ENOTSUPP)
 104                         continue;
 105                 if (ret) {
 106                         seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
 107                         continue;
 108                 }
 109                 /* Space between multiple configs */
 110                 seq_puts(s, " ");
 111                 seq_puts(s, conf_items[i].display);
 112                 /* Print unit if available */
 113                 if (conf_items[i].format && config != 0)
 114                         seq_printf(s, " (%u %s)",
 115                                    pinconf_to_config_argument(config),
 116                                    conf_items[i].format);
 117         }
 118 }
 119
 120 #endif