drivers/pinctrl/pinconf.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Core driver for the 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>
  */
 #define pr_fmt(fmt) "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/machine.h>
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinconf.h>
 #include "core.h"
 #include "pinconf.h"

 int pinconf_check_ops(struct pinctrl_dev *pctldev)
 {
 	const struct pinconf_ops *ops = pctldev->desc->confops;

 	/* We have to be able to config the pins in SOME way */
 	if (!ops->pin_config_set && !ops->pin_config_group_set) {
 		dev_err(pctldev->dev,
 			"pinconf has to be able to set a pins config\n");
 		return -EINVAL;
 	}
 	return 0;
 }

 int pinconf_validate_map(const struct pinctrl_map *map, int i)
 {
 	if (!map->data.configs.group_or_pin) {
 		pr_err("failed to register map %s (%d): no group/pin given\n",
 		       map->name, i);
 		return -EINVAL;
 	}

 	if (!map->data.configs.num_configs ||
 			!map->data.configs.configs) {
 		pr_err("failed to register map %s (%d): no configs given\n",
 		       map->name, i);
 		return -EINVAL;
 	}

 	return 0;
 }

 int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
 			   unsigned long *config)
 {
 	const struct pinconf_ops *ops = pctldev->desc->confops;

 	if (!ops || !ops->pin_config_get) {
 		dev_dbg(pctldev->dev,
 			"cannot get pin configuration, .pin_config_get missing in driver\n");
 		return -ENOTSUPP;
 	}

 	return ops->pin_config_get(pctldev, pin, config);
 }

 int pin_config_group_get(const char *dev_name, const char *pin_group,
 			 unsigned long *config)
 {
 	struct pinctrl_dev *pctldev;
 	const struct pinconf_ops *ops;
 	int selector, ret;

 	pctldev = get_pinctrl_dev_from_devname(dev_name);
 	if (!pctldev) {
 		ret = -EINVAL;
 		return ret;
 	}

 	mutex_lock(&pctldev->mutex);

 	ops = pctldev->desc->confops;

 	if (!ops || !ops->pin_config_group_get) {
 		dev_dbg(pctldev->dev,
 			"cannot get configuration for pin group, missing group config get function in driver\n");
 		ret = -ENOTSUPP;
 		goto unlock;
 	}

 	selector = pinctrl_get_group_selector(pctldev, pin_group);
 	if (selector < 0) {
 		ret = selector;
 		goto unlock;
 	}

 	ret = ops->pin_config_group_get(pctldev, selector, config);

 unlock:
 	mutex_unlock(&pctldev->mutex);
 	return ret;
 }

 int pinconf_map_to_setting(const struct pinctrl_map *map,
 			  struct pinctrl_setting *setting)
 {
 	struct pinctrl_dev *pctldev = setting->pctldev;
 	int pin;

 	switch (setting->type) {
 	case PIN_MAP_TYPE_CONFIGS_PIN:
 		pin = pin_get_from_name(pctldev,
 					map->data.configs.group_or_pin);
 		if (pin < 0) {
 			dev_err(pctldev->dev, "could not map pin config for \"%s\"",
 				map->data.configs.group_or_pin);
 			return pin;
 		}
 		setting->data.configs.group_or_pin = pin;
 		break;
 	case PIN_MAP_TYPE_CONFIGS_GROUP:
 		pin = pinctrl_get_group_selector(pctldev,
 					 map->data.configs.group_or_pin);
 		if (pin < 0) {
 			dev_err(pctldev->dev, "could not map group config for \"%s\"",
 				map->data.configs.group_or_pin);
 			return pin;
 		}
 		setting->data.configs.group_or_pin = pin;
 		break;
 	default:
 		return -EINVAL;
 	}

 	setting->data.configs.num_configs = map->data.configs.num_configs;
 	setting->data.configs.configs = map->data.configs.configs;

 	return 0;
 }

 void pinconf_free_setting(const struct pinctrl_setting *setting)
 {
 }

 int pinconf_apply_setting(const struct pinctrl_setting *setting)
 {
 	struct pinctrl_dev *pctldev = setting->pctldev;
 	const struct pinconf_ops *ops = pctldev->desc->confops;
 	int ret;

 	if (!ops) {
 		dev_err(pctldev->dev, "missing confops\n");
 		return -EINVAL;
 	}

 	switch (setting->type) {
 	case PIN_MAP_TYPE_CONFIGS_PIN:
 		if (!ops->pin_config_set) {
 			dev_err(pctldev->dev, "missing pin_config_set op\n");
 			return -EINVAL;
 		}
 		ret = ops->pin_config_set(pctldev,
 				setting->data.configs.group_or_pin,
 				setting->data.configs.configs,
 				setting->data.configs.num_configs);
 		if (ret < 0) {
 			dev_err(pctldev->dev,
 				"pin_config_set op failed for pin %d\n",
 				setting->data.configs.group_or_pin);
 			return ret;
 		}
 		break;
 	case PIN_MAP_TYPE_CONFIGS_GROUP:
 		if (!ops->pin_config_group_set) {
 			dev_err(pctldev->dev,
 				"missing pin_config_group_set op\n");
 			return -EINVAL;
 		}
 		ret = ops->pin_config_group_set(pctldev,
 				setting->data.configs.group_or_pin,
 				setting->data.configs.configs,
 				setting->data.configs.num_configs);
 		if (ret < 0) {
 			dev_err(pctldev->dev,
 				"pin_config_group_set op failed for group %d\n",
 				setting->data.configs.group_or_pin);
 			return ret;
 		}
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned pin,
 		       unsigned long *configs, size_t nconfigs)
 {
 	const struct pinconf_ops *ops;

 	ops = pctldev->desc->confops;
 	if (!ops || !ops->pin_config_set)
 		return -ENOTSUPP;

 	return ops->pin_config_set(pctldev, pin, configs, nconfigs);
 }

 #ifdef CONFIG_DEBUG_FS

 static void pinconf_show_config(struct seq_file *s, struct pinctrl_dev *pctldev,
 		      unsigned long *configs, unsigned num_configs)
 {
 	const struct pinconf_ops *confops;
 	int i;

 	if (pctldev)
 		confops = pctldev->desc->confops;
 	else
 		confops = NULL;

 	for (i = 0; i < num_configs; i++) {
 		seq_puts(s, "config ");
 		if (confops && confops->pin_config_config_dbg_show)
 			confops->pin_config_config_dbg_show(pctldev, s,
 							    configs[i]);
 		else
 			seq_printf(s, "%08lx", configs[i]);
 		seq_putc(s, '\n');
 	}
 }

 void pinconf_show_map(struct seq_file *s, const struct pinctrl_map *map)
 {
 	struct pinctrl_dev *pctldev;

 	pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);

 	switch (map->type) {
 	case PIN_MAP_TYPE_CONFIGS_PIN:
 		seq_puts(s, "pin ");
 		break;
 	case PIN_MAP_TYPE_CONFIGS_GROUP:
 		seq_puts(s, "group ");
 		break;
 	default:
 		break;
 	}

 	seq_printf(s, "%s\n", map->data.configs.group_or_pin);

 	pinconf_show_config(s, pctldev, map->data.configs.configs,
 			    map->data.configs.num_configs);
 }

 void pinconf_show_setting(struct seq_file *s,
 			  const struct pinctrl_setting *setting)
 {
 	struct pinctrl_dev *pctldev = setting->pctldev;
 	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 	struct pin_desc *desc;

 	switch (setting->type) {
 	case PIN_MAP_TYPE_CONFIGS_PIN:
 		desc = pin_desc_get(setting->pctldev,
 				    setting->data.configs.group_or_pin);
 		seq_printf(s, "pin %s (%d)", desc->name,
 			   setting->data.configs.group_or_pin);
 		break;
 	case PIN_MAP_TYPE_CONFIGS_GROUP:
 		seq_printf(s, "group %s (%d)",
 			   pctlops->get_group_name(pctldev,
 					setting->data.configs.group_or_pin),
 			   setting->data.configs.group_or_pin);
 		break;
 	default:
 		break;
 	}

 	/*
 	 * FIXME: We should really get the pin controller to dump the config
 	 * values, so they can be decoded to something meaningful.
 	 */
 	pinconf_show_config(s, pctldev, setting->data.configs.configs,
 			    setting->data.configs.num_configs);
 }

 static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
 			     struct seq_file *s, int pin)
 {
 	const struct pinconf_ops *ops = pctldev->desc->confops;

 	/* no-op when not using generic pin config */
 	pinconf_generic_dump_pins(pctldev, s, NULL, pin);
 	if (ops && ops->pin_config_dbg_show)
 		ops->pin_config_dbg_show(pctldev, s, pin);
 }

 static int pinconf_pins_show(struct seq_file *s, void *what)
 {
 	struct pinctrl_dev *pctldev = s->private;
 	unsigned i, pin;

 	seq_puts(s, "Pin config settings per pin\n");
 	seq_puts(s, "Format: pin (name): configs\n");

 	mutex_lock(&pctldev->mutex);

 	/* The pin number can be retrived from the pin controller descriptor */
 	for (i = 0; i < pctldev->desc->npins; i++) {
 		struct pin_desc *desc;

 		pin = pctldev->desc->pins[i].number;
 		desc = pin_desc_get(pctldev, pin);
 		/* Skip if we cannot search the pin */
 		if (!desc)
 			continue;

 		seq_printf(s, "pin %d (%s): ", pin, desc->name);

 		pinconf_dump_pin(pctldev, s, pin);
 		seq_putc(s, '\n');
 	}

 	mutex_unlock(&pctldev->mutex);

 	return 0;
 }

 static void pinconf_dump_group(struct pinctrl_dev *pctldev,
 			       struct seq_file *s, unsigned selector,
 			       const char *gname)
 {
 	const struct pinconf_ops *ops = pctldev->desc->confops;

 	/* no-op when not using generic pin config */
 	pinconf_generic_dump_pins(pctldev, s, gname, 0);
 	if (ops && ops->pin_config_group_dbg_show)
 		ops->pin_config_group_dbg_show(pctldev, s, selector);
 }

 static int pinconf_groups_show(struct seq_file *s, void *what)
 {
 	struct pinctrl_dev *pctldev = s->private;
 	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 	unsigned ngroups = pctlops->get_groups_count(pctldev);
 	unsigned selector = 0;

 	seq_puts(s, "Pin config settings per pin group\n");
 	seq_puts(s, "Format: group (name): configs\n");

 	while (selector < ngroups) {
 		const char *gname = pctlops->get_group_name(pctldev, selector);

 		seq_printf(s, "%u (%s): ", selector, gname);
 		pinconf_dump_group(pctldev, s, selector, gname);
 		seq_putc(s, '\n');
 		selector++;
 	}

 	return 0;
 }

 DEFINE_SHOW_ATTRIBUTE(pinconf_pins);
 DEFINE_SHOW_ATTRIBUTE(pinconf_groups);

 void pinconf_init_device_debugfs(struct dentry *devroot,
 			 struct pinctrl_dev *pctldev)
 {
 	debugfs_create_file("pinconf-pins", 0444,
 			    devroot, pctldev, &pinconf_pins_fops);
 	debugfs_create_file("pinconf-groups", 0444,
 			    devroot, pctldev, &pinconf_groups_fops);
 }

 #endif
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Core driver for the 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>
	*/
	#define pr_fmt(fmt) "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/machine.h>
	#include <linux/pinctrl/pinctrl.h>
	#include <linux/pinctrl/pinconf.h>
	#include "core.h"
	#include "pinconf.h"

	int pinconf_check_ops(struct pinctrl_dev *pctldev)
	{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	/* We have to be able to config the pins in SOME way */
	if (!ops->pin_config_set && !ops->pin_config_group_set) {
	dev_err(pctldev->dev,
	"pinconf has to be able to set a pins config\n");
	return -EINVAL;
	}
	return 0;
	}

	int pinconf_validate_map(const struct pinctrl_map *map, int i)
	{
	if (!map->data.configs.group_or_pin) {
	pr_err("failed to register map %s (%d): no group/pin given\n",
	map->name, i);
	return -EINVAL;
	}

	if (!map->data.configs.num_configs \|\|
	!map->data.configs.configs) {
	pr_err("failed to register map %s (%d): no configs given\n",
	map->name, i);
	return -EINVAL;
	}

	return 0;
	}

	int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
	unsigned long *config)
	{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	if (!ops \|\| !ops->pin_config_get) {
	dev_dbg(pctldev->dev,
	"cannot get pin configuration, .pin_config_get missing in driver\n");
	return -ENOTSUPP;
	}

	return ops->pin_config_get(pctldev, pin, config);
	}

	int pin_config_group_get(const char dev_name, const char pin_group,
	unsigned long *config)
	{
	struct pinctrl_dev *pctldev;
	const struct pinconf_ops *ops;
	int selector, ret;

	pctldev = get_pinctrl_dev_from_devname(dev_name);
	if (!pctldev) {
	ret = -EINVAL;
	return ret;
	}

	mutex_lock(&pctldev->mutex);

	ops = pctldev->desc->confops;

	if (!ops \|\| !ops->pin_config_group_get) {
	dev_dbg(pctldev->dev,
	"cannot get configuration for pin group, missing group config get function in driver\n");
	ret = -ENOTSUPP;
	goto unlock;
	}

	selector = pinctrl_get_group_selector(pctldev, pin_group);
	if (selector < 0) {
	ret = selector;
	goto unlock;
	}

	ret = ops->pin_config_group_get(pctldev, selector, config);

	unlock:
	mutex_unlock(&pctldev->mutex);
	return ret;
	}

	int pinconf_map_to_setting(const struct pinctrl_map *map,
	struct pinctrl_setting *setting)
	{
	struct pinctrl_dev *pctldev = setting->pctldev;
	int pin;

	switch (setting->type) {
	case PIN_MAP_TYPE_CONFIGS_PIN:
	pin = pin_get_from_name(pctldev,
	map->data.configs.group_or_pin);
	if (pin < 0) {
	dev_err(pctldev->dev, "could not map pin config for \"%s\"",
	map->data.configs.group_or_pin);
	return pin;
	}
	setting->data.configs.group_or_pin = pin;
	break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
	pin = pinctrl_get_group_selector(pctldev,
	map->data.configs.group_or_pin);
	if (pin < 0) {
	dev_err(pctldev->dev, "could not map group config for \"%s\"",
	map->data.configs.group_or_pin);
	return pin;
	}
	setting->data.configs.group_or_pin = pin;
	break;
	default:
	return -EINVAL;
	}

	setting->data.configs.num_configs = map->data.configs.num_configs;
	setting->data.configs.configs = map->data.configs.configs;

	return 0;
	}

	void pinconf_free_setting(const struct pinctrl_setting *setting)
	{
	}

	int pinconf_apply_setting(const struct pinctrl_setting *setting)
	{
	struct pinctrl_dev *pctldev = setting->pctldev;
	const struct pinconf_ops *ops = pctldev->desc->confops;
	int ret;

	if (!ops) {
	dev_err(pctldev->dev, "missing confops\n");
	return -EINVAL;
	}

	switch (setting->type) {
	case PIN_MAP_TYPE_CONFIGS_PIN:
	if (!ops->pin_config_set) {
	dev_err(pctldev->dev, "missing pin_config_set op\n");
	return -EINVAL;
	}
	ret = ops->pin_config_set(pctldev,
	setting->data.configs.group_or_pin,
	setting->data.configs.configs,
	setting->data.configs.num_configs);
	if (ret < 0) {
	dev_err(pctldev->dev,
	"pin_config_set op failed for pin %d\n",
	setting->data.configs.group_or_pin);
	return ret;
	}
	break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
	if (!ops->pin_config_group_set) {
	dev_err(pctldev->dev,
	"missing pin_config_group_set op\n");
	return -EINVAL;
	}
	ret = ops->pin_config_group_set(pctldev,
	setting->data.configs.group_or_pin,
	setting->data.configs.configs,
	setting->data.configs.num_configs);
	if (ret < 0) {
	dev_err(pctldev->dev,
	"pin_config_group_set op failed for group %d\n",
	setting->data.configs.group_or_pin);
	return ret;
	}
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	int pinconf_set_config(struct pinctrl_dev *pctldev, unsigned pin,
	unsigned long *configs, size_t nconfigs)
	{
	const struct pinconf_ops *ops;

	ops = pctldev->desc->confops;
	if (!ops \|\| !ops->pin_config_set)
	return -ENOTSUPP;

	return ops->pin_config_set(pctldev, pin, configs, nconfigs);
	}

	#ifdef CONFIG_DEBUG_FS

	static void pinconf_show_config(struct seq_file s, struct pinctrl_dev pctldev,
	unsigned long *configs, unsigned num_configs)
	{
	const struct pinconf_ops *confops;
	int i;

	if (pctldev)
	confops = pctldev->desc->confops;
	else
	confops = NULL;

	for (i = 0; i < num_configs; i++) {
	seq_puts(s, "config ");
	if (confops && confops->pin_config_config_dbg_show)
	confops->pin_config_config_dbg_show(pctldev, s,
	configs[i]);
	else
	seq_printf(s, "%08lx", configs[i]);
	seq_putc(s, '\n');
	}
	}

	void pinconf_show_map(struct seq_file s, const struct pinctrl_map map)
	{
	struct pinctrl_dev *pctldev;

	pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);

	switch (map->type) {
	case PIN_MAP_TYPE_CONFIGS_PIN:
	seq_puts(s, "pin ");
	break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
	seq_puts(s, "group ");
	break;
	default:
	break;
	}

	seq_printf(s, "%s\n", map->data.configs.group_or_pin);

	pinconf_show_config(s, pctldev, map->data.configs.configs,
	map->data.configs.num_configs);
	}

	void pinconf_show_setting(struct seq_file *s,
	const struct pinctrl_setting *setting)
	{
	struct pinctrl_dev *pctldev = setting->pctldev;
	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	struct pin_desc *desc;

	switch (setting->type) {
	case PIN_MAP_TYPE_CONFIGS_PIN:
	desc = pin_desc_get(setting->pctldev,
	setting->data.configs.group_or_pin);
	seq_printf(s, "pin %s (%d)", desc->name,
	setting->data.configs.group_or_pin);
	break;
	case PIN_MAP_TYPE_CONFIGS_GROUP:
	seq_printf(s, "group %s (%d)",
	pctlops->get_group_name(pctldev,
	setting->data.configs.group_or_pin),
	setting->data.configs.group_or_pin);
	break;
	default:
	break;
	}

	/*
	* FIXME: We should really get the pin controller to dump the config
	* values, so they can be decoded to something meaningful.
	*/
	pinconf_show_config(s, pctldev, setting->data.configs.configs,
	setting->data.configs.num_configs);
	}

	static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
	struct seq_file *s, int pin)
	{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	/* no-op when not using generic pin config */
	pinconf_generic_dump_pins(pctldev, s, NULL, pin);
	if (ops && ops->pin_config_dbg_show)
	ops->pin_config_dbg_show(pctldev, s, pin);
	}

	static int pinconf_pins_show(struct seq_file s, void what)
	{
	struct pinctrl_dev *pctldev = s->private;
	unsigned i, pin;

	seq_puts(s, "Pin config settings per pin\n");
	seq_puts(s, "Format: pin (name): configs\n");

	mutex_lock(&pctldev->mutex);

	/* The pin number can be retrived from the pin controller descriptor */
	for (i = 0; i < pctldev->desc->npins; i++) {
	struct pin_desc *desc;

	pin = pctldev->desc->pins[i].number;
	desc = pin_desc_get(pctldev, pin);
	/* Skip if we cannot search the pin */
	if (!desc)
	continue;

	seq_printf(s, "pin %d (%s): ", pin, desc->name);

	pinconf_dump_pin(pctldev, s, pin);
	seq_putc(s, '\n');
	}

	mutex_unlock(&pctldev->mutex);

	return 0;
	}

	static void pinconf_dump_group(struct pinctrl_dev *pctldev,
	struct seq_file *s, unsigned selector,
	const char *gname)
	{
	const struct pinconf_ops *ops = pctldev->desc->confops;

	/* no-op when not using generic pin config */
	pinconf_generic_dump_pins(pctldev, s, gname, 0);
	if (ops && ops->pin_config_group_dbg_show)
	ops->pin_config_group_dbg_show(pctldev, s, selector);
	}

	static int pinconf_groups_show(struct seq_file s, void what)
	{
	struct pinctrl_dev *pctldev = s->private;
	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	unsigned ngroups = pctlops->get_groups_count(pctldev);
	unsigned selector = 0;

	seq_puts(s, "Pin config settings per pin group\n");
	seq_puts(s, "Format: group (name): configs\n");

	while (selector < ngroups) {
	const char *gname = pctlops->get_group_name(pctldev, selector);

	seq_printf(s, "%u (%s): ", selector, gname);
	pinconf_dump_group(pctldev, s, selector, gname);
	seq_putc(s, '\n');
	selector++;
	}

	return 0;
	}

	DEFINE_SHOW_ATTRIBUTE(pinconf_pins);
	DEFINE_SHOW_ATTRIBUTE(pinconf_groups);

	void pinconf_init_device_debugfs(struct dentry *devroot,
	struct pinctrl_dev *pctldev)
	{
	debugfs_create_file("pinconf-pins", 0444,
	devroot, pctldev, &pinconf_pins_fops);
	debugfs_create_file("pinconf-groups", 0444,
	devroot, pctldev, &pinconf_groups_fops);
	}

	#endif