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