585 строки
14 KiB
C
585 строки
14 KiB
C
/*
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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 <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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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 must be able to read out pin status */
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if (!ops->pin_config_get && !ops->pin_config_group_get)
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return -EINVAL;
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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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return -EINVAL;
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return 0;
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}
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int pinconf_validate_map(struct pinctrl_map const *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 ptr 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_err(pctldev->dev, "cannot get pin configuration, missing "
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"pin_config_get() function in driver\n");
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return -EINVAL;
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}
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return ops->pin_config_get(pctldev, pin, config);
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}
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/**
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* pin_config_get() - get the configuration of a single pin parameter
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* @dev_name: name of the pin controller device for this pin
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* @name: name of the pin to get the config for
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* @config: the config pointed to by this argument will be filled in with the
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* current pin state, it can be used directly by drivers as a numeral, or
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* it can be dereferenced to any struct.
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*/
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int pin_config_get(const char *dev_name, const char *name,
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unsigned long *config)
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{
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struct pinctrl_dev *pctldev;
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int pin;
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mutex_lock(&pinctrl_mutex);
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pctldev = get_pinctrl_dev_from_devname(dev_name);
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if (!pctldev) {
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pin = -EINVAL;
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goto unlock;
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}
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pin = pin_get_from_name(pctldev, name);
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if (pin < 0)
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goto unlock;
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pin = pin_config_get_for_pin(pctldev, pin, config);
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unlock:
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mutex_unlock(&pinctrl_mutex);
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return pin;
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}
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EXPORT_SYMBOL(pin_config_get);
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static int pin_config_set_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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int ret;
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if (!ops || !ops->pin_config_set) {
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dev_err(pctldev->dev, "cannot configure pin, missing "
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"config function in driver\n");
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return -EINVAL;
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}
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ret = ops->pin_config_set(pctldev, pin, config);
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if (ret) {
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dev_err(pctldev->dev,
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"unable to set pin configuration on pin %d\n", pin);
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return ret;
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}
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return 0;
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}
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/**
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* pin_config_set() - set the configuration of a single pin parameter
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* @dev_name: name of pin controller device for this pin
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* @name: name of the pin to set the config for
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* @config: the config in this argument will contain the desired pin state, it
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* can be used directly by drivers as a numeral, or it can be dereferenced
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* to any struct.
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*/
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int pin_config_set(const char *dev_name, const char *name,
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unsigned long config)
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{
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struct pinctrl_dev *pctldev;
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int pin, ret;
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mutex_lock(&pinctrl_mutex);
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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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goto unlock;
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}
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pin = pin_get_from_name(pctldev, name);
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if (pin < 0) {
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ret = pin;
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goto unlock;
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}
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ret = pin_config_set_for_pin(pctldev, pin, config);
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unlock:
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mutex_unlock(&pinctrl_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pin_config_set);
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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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mutex_lock(&pinctrl_mutex);
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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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goto unlock;
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}
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ops = pctldev->desc->confops;
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if (!ops || !ops->pin_config_group_get) {
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dev_err(pctldev->dev, "cannot get configuration for pin "
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"group, missing group config get function in "
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"driver\n");
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ret = -EINVAL;
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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(&pinctrl_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pin_config_group_get);
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int pin_config_group_set(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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const struct pinctrl_ops *pctlops;
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int selector;
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const unsigned *pins;
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unsigned num_pins;
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int ret;
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int i;
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mutex_lock(&pinctrl_mutex);
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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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goto unlock;
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}
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ops = pctldev->desc->confops;
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pctlops = pctldev->desc->pctlops;
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if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
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dev_err(pctldev->dev, "cannot configure pin group, missing "
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"config function in driver\n");
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ret = -EINVAL;
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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 = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins);
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if (ret) {
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dev_err(pctldev->dev, "cannot configure pin group, error "
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"getting pins\n");
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goto unlock;
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}
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/*
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* If the pin controller supports handling entire groups we use that
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* capability.
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*/
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if (ops->pin_config_group_set) {
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ret = ops->pin_config_group_set(pctldev, selector, config);
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/*
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* If the pin controller prefer that a certain group be handled
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* pin-by-pin as well, it returns -EAGAIN.
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*/
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if (ret != -EAGAIN)
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goto unlock;
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}
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/*
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* If the controller cannot handle entire groups, we configure each pin
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* individually.
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*/
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if (!ops->pin_config_set) {
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ret = 0;
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goto unlock;
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}
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for (i = 0; i < num_pins; i++) {
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ret = ops->pin_config_set(pctldev, pins[i], config);
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if (ret < 0)
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goto unlock;
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}
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ret = 0;
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unlock:
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mutex_unlock(&pinctrl_mutex);
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return ret;
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}
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EXPORT_SYMBOL(pin_config_group_set);
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int pinconf_map_to_setting(struct pinctrl_map const *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(struct pinctrl_setting const *setting)
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{
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}
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int pinconf_apply_setting(struct pinctrl_setting const *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 i, 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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for (i = 0; i < setting->data.configs.num_configs; i++) {
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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[i]);
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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 config %08lx\n",
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setting->data.configs.group_or_pin,
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setting->data.configs.configs[i]);
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return ret;
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}
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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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for (i = 0; i < setting->data.configs.num_configs; i++) {
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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[i]);
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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 config %08lx\n",
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setting->data.configs.group_or_pin,
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setting->data.configs.configs[i]);
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return ret;
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}
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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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#ifdef CONFIG_DEBUG_FS
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void pinconf_show_map(struct seq_file *s, struct pinctrl_map const *map)
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{
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struct pinctrl_dev *pctldev;
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const struct pinconf_ops *confops;
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int i;
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pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
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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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switch (map->type) {
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case PIN_MAP_TYPE_CONFIGS_PIN:
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seq_printf(s, "pin ");
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break;
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case PIN_MAP_TYPE_CONFIGS_GROUP:
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seq_printf(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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for (i = 0; i < map->data.configs.num_configs; i++) {
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seq_printf(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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map->data.configs.configs[i]);
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else
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seq_printf(s, "%08lx", map->data.configs.configs[i]);
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seq_printf(s, "\n");
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}
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}
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void pinconf_show_setting(struct seq_file *s,
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struct pinctrl_setting const *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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const struct pinconf_ops *confops = pctldev->desc->confops;
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struct pin_desc *desc;
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int i;
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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)",
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desc->name ? desc->name : "unnamed",
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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 controler 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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for (i = 0; i < setting->data.configs.num_configs; i++) {
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seq_printf(s, " ");
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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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setting->data.configs.configs[i]);
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else
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seq_printf(s, "%08lx",
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setting->data.configs.configs[i]);
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}
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seq_printf(s, "\n");
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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_pin(pctldev, s, 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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const struct pinconf_ops *ops = pctldev->desc->confops;
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unsigned i, pin;
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if (!ops || !ops->pin_config_get)
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return 0;
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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(&pinctrl_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 == NULL)
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continue;
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seq_printf(s, "pin %d (%s):", pin,
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desc->name ? desc->name : "unnamed");
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pinconf_dump_pin(pctldev, s, pin);
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seq_printf(s, "\n");
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}
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mutex_unlock(&pinctrl_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_group(pctldev, s, gname);
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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;
|
|
const struct pinconf_ops *ops = pctldev->desc->confops;
|
|
unsigned ngroups = pctlops->get_groups_count(pctldev);
|
|
unsigned selector = 0;
|
|
|
|
if (!ops || !ops->pin_config_group_get)
|
|
return 0;
|
|
|
|
seq_puts(s, "Pin config settings per pin group\n");
|
|
seq_puts(s, "Format: group (name): configs\n");
|
|
|
|
mutex_lock(&pinctrl_mutex);
|
|
|
|
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_printf(s, "\n");
|
|
|
|
selector++;
|
|
}
|
|
|
|
mutex_unlock(&pinctrl_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pinconf_pins_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, pinconf_pins_show, inode->i_private);
|
|
}
|
|
|
|
static int pinconf_groups_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, pinconf_groups_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations pinconf_pins_ops = {
|
|
.open = pinconf_pins_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static const struct file_operations pinconf_groups_ops = {
|
|
.open = pinconf_groups_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
void pinconf_init_device_debugfs(struct dentry *devroot,
|
|
struct pinctrl_dev *pctldev)
|
|
{
|
|
debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
|
|
devroot, pctldev, &pinconf_pins_ops);
|
|
debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
|
|
devroot, pctldev, &pinconf_groups_ops);
|
|
}
|
|
|
|
#endif
|