| /* |
| * Core driver for the generic pin config portions of the pin control subsystem |
| * |
| * Copyright (C) 2011 ST-Ericsson SA |
| * Written on behalf of Linaro for ST-Ericsson |
| * |
| * Author: Linus Walleij <linus.walleij@linaro.org> |
| * |
| * License terms: GNU General Public License (GPL) version 2 |
| */ |
| |
| #define pr_fmt(fmt) "generic pinconfig core: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/pinctrl/pinctrl.h> |
| #include <linux/pinctrl/pinconf.h> |
| #include <linux/pinctrl/pinconf-generic.h> |
| #include <linux/of.h> |
| #include "core.h" |
| #include "pinconf.h" |
| |
| #ifdef CONFIG_DEBUG_FS |
| |
| struct pin_config_item { |
| const enum pin_config_param param; |
| const char * const display; |
| const char * const format; |
| }; |
| |
| #define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c } |
| |
| static struct pin_config_item conf_items[] = { |
| PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL), |
| PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL), |
| PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL), |
| PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL), |
| PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL), |
| PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, |
| "input bias pull to pin specific state", NULL), |
| PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL), |
| PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL), |
| PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL), |
| PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA"), |
| PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL), |
| PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL), |
| PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL), |
| PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec"), |
| PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"), |
| PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL), |
| PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"), |
| PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"), |
| }; |
| |
| void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev, |
| struct seq_file *s, unsigned pin) |
| { |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| int i; |
| |
| if (!ops->is_generic) |
| return; |
| |
| for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
| unsigned long config; |
| int ret; |
| |
| /* We want to check out this parameter */ |
| config = pinconf_to_config_packed(conf_items[i].param, 0); |
| ret = pin_config_get_for_pin(pctldev, pin, &config); |
| /* These are legal errors */ |
| if (ret == -EINVAL || ret == -ENOTSUPP) |
| continue; |
| if (ret) { |
| seq_printf(s, "ERROR READING CONFIG SETTING %d ", i); |
| continue; |
| } |
| /* Space between multiple configs */ |
| seq_puts(s, " "); |
| seq_puts(s, conf_items[i].display); |
| /* Print unit if available */ |
| if (conf_items[i].format && |
| pinconf_to_config_argument(config) != 0) |
| seq_printf(s, " (%u %s)", |
| pinconf_to_config_argument(config), |
| conf_items[i].format); |
| } |
| } |
| |
| void pinconf_generic_dump_group(struct pinctrl_dev *pctldev, |
| struct seq_file *s, const char *gname) |
| { |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| int i; |
| |
| if (!ops->is_generic) |
| return; |
| |
| for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
| unsigned long config; |
| int ret; |
| |
| /* We want to check out this parameter */ |
| config = pinconf_to_config_packed(conf_items[i].param, 0); |
| ret = pin_config_group_get(dev_name(pctldev->dev), gname, |
| &config); |
| /* These are legal errors */ |
| if (ret == -EINVAL || ret == -ENOTSUPP) |
| continue; |
| if (ret) { |
| seq_printf(s, "ERROR READING CONFIG SETTING %d ", i); |
| continue; |
| } |
| /* Space between multiple configs */ |
| seq_puts(s, " "); |
| seq_puts(s, conf_items[i].display); |
| /* Print unit if available */ |
| if (conf_items[i].format && config != 0) |
| seq_printf(s, " (%u %s)", |
| pinconf_to_config_argument(config), |
| conf_items[i].format); |
| } |
| } |
| |
| void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, |
| struct seq_file *s, unsigned long config) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
| if (pinconf_to_config_param(config) != conf_items[i].param) |
| continue; |
| seq_printf(s, "%s: 0x%x", conf_items[i].display, |
| pinconf_to_config_argument(config)); |
| } |
| } |
| EXPORT_SYMBOL_GPL(pinconf_generic_dump_config); |
| #endif |
| |
| #ifdef CONFIG_OF |
| struct pinconf_generic_dt_params { |
| const char * const property; |
| enum pin_config_param param; |
| u32 default_value; |
| }; |
| |
| static struct pinconf_generic_dt_params dt_params[] = { |
| { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, |
| { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 }, |
| { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 }, |
| { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, |
| { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, |
| { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 }, |
| { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 }, |
| { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 }, |
| { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 }, |
| { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 }, |
| { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 }, |
| { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 }, |
| { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 }, |
| { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 }, |
| { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 }, |
| { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 }, |
| { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 }, |
| { "output-low", PIN_CONFIG_OUTPUT, 0, }, |
| { "output-high", PIN_CONFIG_OUTPUT, 1, }, |
| { "slew-rate", PIN_CONFIG_SLEW_RATE, 0}, |
| }; |
| |
| /** |
| * pinconf_generic_parse_dt_config() |
| * parse the config properties into generic pinconfig values. |
| * @np: node containing the pinconfig properties |
| * @configs: array with nconfigs entries containing the generic pinconf values |
| * @nconfigs: umber of configurations |
| */ |
| int pinconf_generic_parse_dt_config(struct device_node *np, |
| unsigned long **configs, |
| unsigned int *nconfigs) |
| { |
| unsigned long *cfg; |
| unsigned int ncfg = 0; |
| int ret; |
| int i; |
| u32 val; |
| |
| if (!np) |
| return -EINVAL; |
| |
| /* allocate a temporary array big enough to hold one of each option */ |
| cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL); |
| if (!cfg) |
| return -ENOMEM; |
| |
| for (i = 0; i < ARRAY_SIZE(dt_params); i++) { |
| struct pinconf_generic_dt_params *par = &dt_params[i]; |
| ret = of_property_read_u32(np, par->property, &val); |
| |
| /* property not found */ |
| if (ret == -EINVAL) |
| continue; |
| |
| /* use default value, when no value is specified */ |
| if (ret) |
| val = par->default_value; |
| |
| pr_debug("found %s with value %u\n", par->property, val); |
| cfg[ncfg] = pinconf_to_config_packed(par->param, val); |
| ncfg++; |
| } |
| |
| ret = 0; |
| |
| /* no configs found at all */ |
| if (ncfg == 0) { |
| *configs = NULL; |
| *nconfigs = 0; |
| goto out; |
| } |
| |
| /* |
| * Now limit the number of configs to the real number of |
| * found properties. |
| */ |
| *configs = kzalloc(ncfg * sizeof(unsigned long), GFP_KERNEL); |
| if (!*configs) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| memcpy(*configs, cfg, ncfg * sizeof(unsigned long)); |
| *nconfigs = ncfg; |
| |
| out: |
| kfree(cfg); |
| return ret; |
| } |
| #endif |