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379 lines
9.3 KiB
379 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Core driver for the pin config portions of the pin control subsystem |
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* |
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* Copyright (C) 2011 ST-Ericsson SA |
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* Written on behalf of Linaro for ST-Ericsson |
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* |
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* Author: Linus Walleij <[email protected]> |
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*/ |
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#define pr_fmt(fmt) "pinconfig core: " fmt |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/device.h> |
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#include <linux/slab.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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#include <linux/pinctrl/machine.h> |
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#include <linux/pinctrl/pinctrl.h> |
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#include <linux/pinctrl/pinconf.h> |
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#include "core.h" |
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#include "pinconf.h" |
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int pinconf_check_ops(struct pinctrl_dev *pctldev) |
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{ |
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const struct pinconf_ops *ops = pctldev->desc->confops; |
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/* We have to be able to config the pins in SOME way */ |
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if (!ops->pin_config_set && !ops->pin_config_group_set) { |
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dev_err(pctldev->dev, |
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"pinconf has to be able to set a pins config\n"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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int pinconf_validate_map(const struct pinctrl_map *map, int i) |
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{ |
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if (!map->data.configs.group_or_pin) { |
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pr_err("failed to register map %s (%d): no group/pin given\n", |
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map->name, i); |
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return -EINVAL; |
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} |
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if (!map->data.configs.num_configs || |
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!map->data.configs.configs) { |
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pr_err("failed to register map %s (%d): no configs given\n", |
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map->name, i); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin, |
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unsigned long *config) |
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{ |
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const struct pinconf_ops *ops = pctldev->desc->confops; |
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if (!ops || !ops->pin_config_get) { |
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dev_dbg(pctldev->dev, |
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"cannot get pin configuration, .pin_config_get missing in driver\n"); |
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return -ENOTSUPP; |
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} |
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return ops->pin_config_get(pctldev, pin, config); |
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} |
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int pin_config_group_get(const char *dev_name, const char *pin_group, |
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unsigned long *config) |
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{ |
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struct pinctrl_dev *pctldev; |
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const struct pinconf_ops *ops; |
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int selector, ret; |
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pctldev = get_pinctrl_dev_from_devname(dev_name); |
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if (!pctldev) { |
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ret = -EINVAL; |
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return ret; |
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} |
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mutex_lock(&pctldev->mutex); |
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ops = pctldev->desc->confops; |
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if (!ops || !ops->pin_config_group_get) { |
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dev_dbg(pctldev->dev, |
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"cannot get configuration for pin group, missing group config get function in driver\n"); |
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ret = -ENOTSUPP; |
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goto unlock; |
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} |
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selector = pinctrl_get_group_selector(pctldev, pin_group); |
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if (selector < 0) { |
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ret = selector; |
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goto unlock; |
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} |
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ret = ops->pin_config_group_get(pctldev, selector, config); |
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unlock: |
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mutex_unlock(&pctldev->mutex); |
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return ret; |
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} |
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int pinconf_map_to_setting(const struct pinctrl_map *map, |
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struct pinctrl_setting *setting) |
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{ |
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struct pinctrl_dev *pctldev = setting->pctldev; |
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int pin; |
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switch (setting->type) { |
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case PIN_MAP_TYPE_CONFIGS_PIN: |
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pin = pin_get_from_name(pctldev, |
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map->data.configs.group_or_pin); |
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if (pin < 0) { |
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dev_err(pctldev->dev, "could not map pin config for \"%s\"", |
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map->data.configs.group_or_pin); |
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return pin; |
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} |
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setting->data.configs.group_or_pin = pin; |
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break; |
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case PIN_MAP_TYPE_CONFIGS_GROUP: |
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pin = pinctrl_get_group_selector(pctldev, |
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map->data.configs.group_or_pin); |
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if (pin < 0) { |
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dev_err(pctldev->dev, "could not map group config for \"%s\"", |
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map->data.configs.group_or_pin); |
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return pin; |
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} |
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setting->data.configs.group_or_pin = pin; |
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break; |
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default: |
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return -EINVAL; |
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} |
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setting->data.configs.num_configs = map->data.configs.num_configs; |
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setting->data.configs.configs = map->data.configs.configs; |
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return 0; |
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} |
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void pinconf_free_setting(const struct pinctrl_setting *setting) |
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{ |
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} |
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int pinconf_apply_setting(const struct pinctrl_setting *setting) |
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{ |
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struct pinctrl_dev *pctldev = setting->pctldev; |
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const struct pinconf_ops *ops = pctldev->desc->confops; |
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int ret; |
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if (!ops) { |
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dev_err(pctldev->dev, "missing confops\n"); |
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return -EINVAL; |
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} |
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switch (setting->type) { |
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case PIN_MAP_TYPE_CONFIGS_PIN: |
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if (!ops->pin_config_set) { |
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dev_err(pctldev->dev, "missing pin_config_set op\n"); |
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return -EINVAL; |
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} |
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ret = ops->pin_config_set(pctldev, |
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setting->data.configs.group_or_pin, |
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setting->data.configs.configs, |
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setting->data.configs.num_configs); |
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if (ret < 0) { |
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dev_err(pctldev->dev, |
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"pin_config_set op failed for pin %d\n", |
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setting->data.configs.group_or_pin); |
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return ret; |
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} |
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break; |
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case PIN_MAP_TYPE_CONFIGS_GROUP: |
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if (!ops->pin_config_group_set) { |
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dev_err(pctldev->dev, |
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"missing pin_config_group_set op\n"); |
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return -EINVAL; |
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} |
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ret = ops->pin_config_group_set(pctldev, |
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setting->data.configs.group_or_pin, |
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setting->data.configs.configs, |
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setting->data.configs.num_configs); |
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if (ret < 0) { |
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dev_err(pctldev->dev, |
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"pin_config_group_set op failed for group %d\n", |
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setting->data.configs.group_or_pin); |
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return ret; |
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} |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned pin, |
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unsigned long *configs, size_t nconfigs) |
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{ |
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const struct pinconf_ops *ops; |
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ops = pctldev->desc->confops; |
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if (!ops || !ops->pin_config_set) |
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return -ENOTSUPP; |
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return ops->pin_config_set(pctldev, pin, configs, nconfigs); |
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} |
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#ifdef CONFIG_DEBUG_FS |
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static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev, |
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unsigned long *configs, unsigned num_configs) |
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{ |
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const struct pinconf_ops *confops; |
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int i; |
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if (pctldev) |
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confops = pctldev->desc->confops; |
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else |
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confops = NULL; |
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for (i = 0; i < num_configs; i++) { |
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seq_puts(s, "config "); |
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if (confops && confops->pin_config_config_dbg_show) |
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confops->pin_config_config_dbg_show(pctldev, s, |
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configs[i]); |
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else |
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seq_printf(s, "%08lx", configs[i]); |
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seq_putc(s, '\n'); |
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} |
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} |
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void pinconf_show_map(struct seq_file *s, const struct pinctrl_map *map) |
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{ |
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struct pinctrl_dev *pctldev; |
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pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); |
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switch (map->type) { |
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case PIN_MAP_TYPE_CONFIGS_PIN: |
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seq_puts(s, "pin "); |
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break; |
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case PIN_MAP_TYPE_CONFIGS_GROUP: |
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seq_puts(s, "group "); |
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break; |
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default: |
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break; |
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} |
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seq_printf(s, "%s\n", map->data.configs.group_or_pin); |
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pinconf_show_config(s, pctldev, map->data.configs.configs, |
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map->data.configs.num_configs); |
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} |
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void pinconf_show_setting(struct seq_file *s, |
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const struct pinctrl_setting *setting) |
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{ |
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struct pinctrl_dev *pctldev = setting->pctldev; |
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
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struct pin_desc *desc; |
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switch (setting->type) { |
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case PIN_MAP_TYPE_CONFIGS_PIN: |
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desc = pin_desc_get(setting->pctldev, |
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setting->data.configs.group_or_pin); |
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seq_printf(s, "pin %s (%d)", desc->name, |
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setting->data.configs.group_or_pin); |
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break; |
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case PIN_MAP_TYPE_CONFIGS_GROUP: |
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seq_printf(s, "group %s (%d)", |
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pctlops->get_group_name(pctldev, |
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setting->data.configs.group_or_pin), |
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setting->data.configs.group_or_pin); |
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break; |
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default: |
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break; |
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} |
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/* |
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* FIXME: We should really get the pin controller to dump the config |
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* values, so they can be decoded to something meaningful. |
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*/ |
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pinconf_show_config(s, pctldev, setting->data.configs.configs, |
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setting->data.configs.num_configs); |
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} |
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static void pinconf_dump_pin(struct pinctrl_dev *pctldev, |
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struct seq_file *s, int pin) |
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{ |
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const struct pinconf_ops *ops = pctldev->desc->confops; |
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/* no-op when not using generic pin config */ |
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pinconf_generic_dump_pins(pctldev, s, NULL, pin); |
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if (ops && ops->pin_config_dbg_show) |
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ops->pin_config_dbg_show(pctldev, s, pin); |
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} |
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static int pinconf_pins_show(struct seq_file *s, void *what) |
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{ |
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struct pinctrl_dev *pctldev = s->private; |
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unsigned i, pin; |
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seq_puts(s, "Pin config settings per pin\n"); |
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seq_puts(s, "Format: pin (name): configs\n"); |
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mutex_lock(&pctldev->mutex); |
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/* The pin number can be retrived from the pin controller descriptor */ |
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for (i = 0; i < pctldev->desc->npins; i++) { |
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struct pin_desc *desc; |
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pin = pctldev->desc->pins[i].number; |
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desc = pin_desc_get(pctldev, pin); |
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/* Skip if we cannot search the pin */ |
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if (!desc) |
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continue; |
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seq_printf(s, "pin %d (%s): ", pin, desc->name); |
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pinconf_dump_pin(pctldev, s, pin); |
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seq_putc(s, '\n'); |
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} |
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mutex_unlock(&pctldev->mutex); |
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return 0; |
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} |
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static void pinconf_dump_group(struct pinctrl_dev *pctldev, |
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struct seq_file *s, unsigned selector, |
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const char *gname) |
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{ |
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const struct pinconf_ops *ops = pctldev->desc->confops; |
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/* no-op when not using generic pin config */ |
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pinconf_generic_dump_pins(pctldev, s, gname, 0); |
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if (ops && ops->pin_config_group_dbg_show) |
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ops->pin_config_group_dbg_show(pctldev, s, selector); |
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} |
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static int pinconf_groups_show(struct seq_file *s, void *what) |
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{ |
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struct pinctrl_dev *pctldev = s->private; |
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
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unsigned ngroups = pctlops->get_groups_count(pctldev); |
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unsigned selector = 0; |
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seq_puts(s, "Pin config settings per pin group\n"); |
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seq_puts(s, "Format: group (name): configs\n"); |
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while (selector < ngroups) { |
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const char *gname = pctlops->get_group_name(pctldev, selector); |
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seq_printf(s, "%u (%s): ", selector, gname); |
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pinconf_dump_group(pctldev, s, selector, gname); |
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seq_putc(s, '\n'); |
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selector++; |
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} |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(pinconf_pins); |
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DEFINE_SHOW_ATTRIBUTE(pinconf_groups); |
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void pinconf_init_device_debugfs(struct dentry *devroot, |
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struct pinctrl_dev *pctldev) |
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{ |
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debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO, |
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devroot, pctldev, &pinconf_pins_fops); |
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debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO, |
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devroot, pctldev, &pinconf_groups_fops); |
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} |
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#endif
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