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230 lines
6.5 KiB
230 lines
6.5 KiB
/*
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* Copyright (c) 2013-2014, 2016, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/regulator/consumer.h>
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#include <linux/regulator/proxy-consumer.h>
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struct proxy_consumer {
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struct list_head list;
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struct regulator *reg;
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bool enable;
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int min_uV;
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int max_uV;
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u32 current_uA;
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};
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static DEFINE_MUTEX(proxy_consumer_list_mutex);
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static LIST_HEAD(proxy_consumer_list);
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static bool proxy_consumers_removed;
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/**
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* regulator_proxy_consumer_register() - conditionally register a proxy consumer
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* for the specified regulator and set its boot time parameters
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* @reg_dev: Device pointer of the regulator
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* @reg_node: Device node pointer of the regulator
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*
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* Returns a struct proxy_consumer pointer corresponding to the regulator on
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* success, ERR_PTR() if an error occurred, or NULL if no proxy consumer is
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* needed for the regulator. This function calls
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* regulator_get(reg_dev, "proxy") after first checking if any proxy consumer
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* properties are present in the reg_node device node. After that, the voltage,
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* minimum current, and/or the enable state will be set based upon the device
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* node property values.
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*/
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struct proxy_consumer *regulator_proxy_consumer_register(struct device *reg_dev,
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struct device_node *reg_node)
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{
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struct proxy_consumer *consumer = NULL;
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const char *reg_name = "";
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u32 voltage[2] = {0};
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int rc;
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/* Return immediately if no proxy consumer properties are specified. */
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if (!of_find_property(reg_node, "qcom,proxy-consumer-enable", NULL)
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&& !of_find_property(reg_node, "qcom,proxy-consumer-voltage", NULL)
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&& !of_find_property(reg_node, "qcom,proxy-consumer-current", NULL))
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return NULL;
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mutex_lock(&proxy_consumer_list_mutex);
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/* Do not register new consumers if they cannot be removed later. */
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if (proxy_consumers_removed) {
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rc = -EPERM;
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goto unlock;
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}
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if (dev_name(reg_dev))
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reg_name = dev_name(reg_dev);
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consumer = kzalloc(sizeof(*consumer), GFP_KERNEL);
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if (!consumer) {
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rc = -ENOMEM;
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goto unlock;
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}
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consumer->enable
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= of_property_read_bool(reg_node, "qcom,proxy-consumer-enable");
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of_property_read_u32(reg_node, "qcom,proxy-consumer-current",
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&consumer->current_uA);
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rc = of_property_read_u32_array(reg_node, "qcom,proxy-consumer-voltage",
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voltage, 2);
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if (!rc) {
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consumer->min_uV = voltage[0];
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consumer->max_uV = voltage[1];
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}
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dev_dbg(reg_dev, "proxy consumer request: enable=%d, voltage_range=[%d, %d] uV, min_current=%d uA\n",
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consumer->enable, consumer->min_uV, consumer->max_uV,
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consumer->current_uA);
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consumer->reg = regulator_get(reg_dev, "proxy");
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if (IS_ERR_OR_NULL(consumer->reg)) {
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rc = PTR_ERR(consumer->reg);
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pr_err("regulator_get() failed for %s, rc=%d\n", reg_name, rc);
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goto unlock;
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}
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if (consumer->max_uV > 0 && consumer->min_uV <= consumer->max_uV) {
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rc = regulator_set_voltage(consumer->reg, consumer->min_uV,
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consumer->max_uV);
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if (rc) {
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pr_err("regulator_set_voltage %s failed, rc=%d\n",
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reg_name, rc);
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goto free_regulator;
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}
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}
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if (consumer->current_uA > 0) {
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rc = regulator_set_load(consumer->reg,
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consumer->current_uA);
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if (rc < 0) {
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pr_err("regulator_set_load %s failed, rc=%d\n",
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reg_name, rc);
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goto remove_voltage;
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}
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}
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if (consumer->enable) {
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rc = regulator_enable(consumer->reg);
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if (rc) {
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pr_err("regulator_enable %s failed, rc=%d\n", reg_name,
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rc);
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goto remove_current;
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}
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}
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list_add(&consumer->list, &proxy_consumer_list);
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mutex_unlock(&proxy_consumer_list_mutex);
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return consumer;
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remove_current:
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regulator_set_load(consumer->reg, 0);
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remove_voltage:
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regulator_set_voltage(consumer->reg, 0, INT_MAX);
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free_regulator:
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regulator_put(consumer->reg);
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unlock:
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kfree(consumer);
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mutex_unlock(&proxy_consumer_list_mutex);
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return ERR_PTR(rc);
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}
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/* proxy_consumer_list_mutex must be held by caller. */
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static int regulator_proxy_consumer_remove(struct proxy_consumer *consumer)
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{
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int rc = 0;
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if (consumer->enable) {
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rc = regulator_disable(consumer->reg);
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if (rc)
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pr_err("regulator_disable failed, rc=%d\n", rc);
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}
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if (consumer->current_uA > 0) {
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rc = regulator_set_load(consumer->reg, 0);
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if (rc < 0)
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pr_err("regulator_set_load failed, rc=%d\n",
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rc);
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}
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if (consumer->max_uV > 0 && consumer->min_uV <= consumer->max_uV) {
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rc = regulator_set_voltage(consumer->reg, 0, INT_MAX);
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if (rc)
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pr_err("regulator_set_voltage failed, rc=%d\n", rc);
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}
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regulator_put(consumer->reg);
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list_del(&consumer->list);
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kfree(consumer);
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return rc;
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}
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/**
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* regulator_proxy_consumer_unregister() - unregister a proxy consumer and
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* remove its boot time requests
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* @consumer: Pointer to proxy_consumer to be removed
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*
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* Returns 0 on success or errno on failure. This function removes all requests
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* made by the proxy consumer in regulator_proxy_consumer_register() and then
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* frees the consumer's resources.
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*/
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int regulator_proxy_consumer_unregister(struct proxy_consumer *consumer)
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{
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int rc = 0;
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if (IS_ERR_OR_NULL(consumer))
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return 0;
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mutex_lock(&proxy_consumer_list_mutex);
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if (!proxy_consumers_removed)
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rc = regulator_proxy_consumer_remove(consumer);
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mutex_unlock(&proxy_consumer_list_mutex);
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return rc;
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}
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/*
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* Remove all proxy requests at late_initcall_sync. The assumption is that all
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* devices have probed at this point and made their own regulator requests.
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*/
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static int __init regulator_proxy_consumer_remove_all(void)
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{
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struct proxy_consumer *consumer;
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struct proxy_consumer *temp;
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mutex_lock(&proxy_consumer_list_mutex);
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proxy_consumers_removed = true;
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if (!list_empty(&proxy_consumer_list))
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pr_info("removing regulator proxy consumer requests\n");
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list_for_each_entry_safe(consumer, temp, &proxy_consumer_list, list) {
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regulator_proxy_consumer_remove(consumer);
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}
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mutex_unlock(&proxy_consumer_list_mutex);
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return 0;
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}
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late_initcall_sync(regulator_proxy_consumer_remove_all);
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