// SPDX-License-Identifier: GPL-2.0
/*
 * Driver core interface to the pinctrl subsystem.
 *
 * Copyright (C) 2012 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 * Based on bits of regulator core, gpio core and clk core
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 */

#include <linux/device.h>
#include <linux/pinctrl/devinfo.h>
#include <linux/pinctrl/consumer.h>
#include <linux/slab.h>

#include "base.h"

/**
 * pinctrl_bind_pins() - called by the device core before probe
 * @dev: the device that is just about to probe
 */
int pinctrl_bind_pins(struct device *dev)
{
        int ret;

        if (dev->of_node_reused)
                return 0;

        dev->pins = devm_kzalloc(dev, sizeof(*(dev->pins)), GFP_KERNEL);
        if (!dev->pins)
                return -ENOMEM;

        dev->pins->p = devm_pinctrl_get(dev);
        if (IS_ERR(dev->pins->p)) {
                dev_dbg(dev, "no pinctrl handle\n");
                ret = PTR_ERR(dev->pins->p);
                goto cleanup_alloc;
        }

        dev->pins->default_state = pinctrl_lookup_state(dev->pins->p,
                                        PINCTRL_STATE_DEFAULT);
        if (IS_ERR(dev->pins->default_state)) {
                dev_dbg(dev, "no default pinctrl state\n");
                ret = 0;
                goto cleanup_get;
        }

        dev->pins->init_state = pinctrl_lookup_state(dev->pins->p,
                                        PINCTRL_STATE_INIT);
        if (IS_ERR(dev->pins->init_state)) {
                /* Not supplying this state is perfectly legal */
                dev_dbg(dev, "no init pinctrl state\n");

                ret = pinctrl_select_state(dev->pins->p,
                                           dev->pins->default_state);
        } else {
                ret = pinctrl_select_state(dev->pins->p, dev->pins->init_state);
        }

        if (ret) {
                dev_dbg(dev, "failed to activate initial pinctrl state\n");
                goto cleanup_get;
        }

#ifdef CONFIG_PM
        /*
         * If power management is enabled, we also look for the optional
         * sleep and idle pin states, with semantics as defined in
         * <linux/pinctrl/pinctrl-state.h>
         */
        dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p,
                                        PINCTRL_STATE_SLEEP);
        if (IS_ERR(dev->pins->sleep_state))
                /* Not supplying this state is perfectly legal */
                dev_dbg(dev, "no sleep pinctrl state\n");

        dev->pins->idle_state = pinctrl_lookup_state(dev->pins->p,
                                        PINCTRL_STATE_IDLE);
        if (IS_ERR(dev->pins->idle_state))
                /* Not supplying this state is perfectly legal */
                dev_dbg(dev, "no idle pinctrl state\n");
#endif

        return 0;

        /*
         * If no pinctrl handle or default state was found for this device,
         * let's explicitly free the pin container in the device, there is
         * no point in keeping it around.
         */
cleanup_get:
        devm_pinctrl_put(dev->pins->p);
cleanup_alloc:
        devm_kfree(dev, dev->pins);
        dev->pins = NULL;

        /* Return deferrals */
        if (ret == -EPROBE_DEFER)
                return ret;
        /* Return serious errors */
        if (ret == -EINVAL)
                return ret;
        /* We ignore errors like -ENOENT meaning no pinctrl state */

        return 0;
}