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_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
  53 void 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
  88 void 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