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 124