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 122