kernel_samsung_a34x-permissive/drivers/leds/regulator-vibrator.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 MediaTek Inc.
*
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/hrtimer.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#define VIB_DEVICE "regulator_vibrator"
#undef pr_fmt
#define pr_fmt(fmt) KBUILD_MODNAME " %s(%d) :" fmt, __func__, __LINE__
#define DEFAULT_MIN_LIMIT 15
struct reg_vibr_config {
unsigned int min_limit;
unsigned int max_limit;
unsigned int min_volt;
unsigned int max_volt;
struct regulator *reg;
};
struct reg_vibr {
struct workqueue_struct *vibr_queue;
struct work_struct vibr_work;
struct hrtimer vibr_timer;
spinlock_t vibr_lock;
unsigned int vibr_dur;
bool vibr_active;
bool vibr_state;
bool vibr_oc_state;
bool reg_status;
bool vibr_shutdown;
struct reg_vibr_config vibr_conf;
struct notifier_block oc_handle;
};
static int mt_vibra_parse_dt(struct device *dev,
struct reg_vibr_config *vibr_conf)
{
int ret;
ret = of_property_read_u32(dev->of_node, "min-limit",
&(vibr_conf->min_limit));
if (ret)
vibr_conf->min_limit = DEFAULT_MIN_LIMIT;
vibr_conf->min_limit = max_t(unsigned int,
vibr_conf->min_limit, DEFAULT_MIN_LIMIT);
ret = of_property_read_u32(dev->of_node, "max-limit",
&(vibr_conf->max_limit));
if (ret)
vibr_conf->max_limit = 0;
if (!vibr_conf->max_limit &&
vibr_conf->max_limit < vibr_conf->min_limit) {
pr_notice("Error load dts: get error limitation(min > max)!\n");
ret = -EINVAL;
return ret;
}
vibr_conf->reg = devm_regulator_get(dev, "vib");
if (IS_ERR(vibr_conf->reg)) {
ret = PTR_ERR(vibr_conf->reg);
pr_notice("Error load dts: get regulator return %d\n", ret);
vibr_conf->reg = NULL;
//return ret;
}
ret = of_property_read_u32(dev->of_node, "max-volt",
&vibr_conf->max_volt);
if (ret) {
pr_notice("Error load dts: get max-volt failed!\n");
ret = -EINVAL;
return ret;
}
ret = of_property_read_u32(dev->of_node, "min-volt",
&vibr_conf->min_volt);
if (ret) {
pr_notice("Error load dts: get min-volt failed!\n");
ret = -EINVAL;
return ret;
}
if (vibr_conf->min_volt > vibr_conf->max_volt) {
pr_notice("Error load dts: get error voltage(min > max)!\n");
ret = -EINVAL;
return ret;
}
pr_info("vibr_conf = %u, %u, %u-%u\n",
vibr_conf->min_limit, vibr_conf->max_limit,
vibr_conf->min_volt, vibr_conf->max_volt);
return ret;
}
static int vibr_power_set(struct reg_vibr *vibr)
{
int ret = 0;
if (vibr->vibr_conf.reg == NULL)
return ret;
pr_info("set voltage = %u-%u\n",
vibr->vibr_conf.min_volt, vibr->vibr_conf.max_volt);
ret = regulator_set_voltage(vibr->vibr_conf.reg,
vibr->vibr_conf.min_volt, vibr->vibr_conf.max_volt);
if (ret < 0)
pr_notice("set voltage fail, ret = %d\n", ret);
return ret;
}
static void vibr_enable(struct reg_vibr *vibr)
{
if (vibr->vibr_conf.reg == NULL)
return;
if (!vibr->reg_status) {
if (regulator_enable(vibr->vibr_conf.reg))
pr_notice("set vibr_reg enable failed!\n");
else
vibr->reg_status = 1;
} else {
pr_notice("vibr_reg already enabled.\n");
}
}
static void vibr_disable(struct reg_vibr *vibr)
{
if (vibr->vibr_conf.reg == NULL)
return;
if (vibr->reg_status) {
if (regulator_disable(vibr->vibr_conf.reg))
pr_notice("set vibr_reg disable failed!\n");
else
vibr->reg_status = 0;
} else {
pr_notice("vibr_reg already disabled.\n");
}
}
static void update_vibrator(struct work_struct *work)
{
struct reg_vibr *vibr = container_of(work, struct reg_vibr, vibr_work);
pr_info("vibr_state = %d\n", vibr->vibr_state);
if (vibr->vibr_oc_state) {
vibr->vibr_oc_state = false;
vibr_disable(vibr);
return;
}
if (!vibr->vibr_state)
vibr_disable(vibr);
else
vibr_enable(vibr);
}
static void vibrator_enable(struct reg_vibr *vibr,
unsigned int dur, unsigned int activate)
{
unsigned long flags;
pr_info("cancel hrtimer, cust:%u-%u, dur:%u, shutdown:%d\n",
vibr->vibr_conf.min_limit, vibr->vibr_conf.max_limit,
dur, vibr->vibr_shutdown);
spin_lock_irqsave(&vibr->vibr_lock, flags);
hrtimer_cancel(&vibr->vibr_timer);
if (!activate || vibr->vibr_shutdown || !dur) {
vibr->vibr_state = 0;
} else {
dur = max(vibr->vibr_conf.min_limit, dur);
if (vibr->vibr_conf.max_limit)
dur = min(dur, vibr->vibr_conf.max_limit);
vibr->vibr_state = 1;
hrtimer_start(&vibr->vibr_timer,
ktime_set(dur / 1000, (dur % 1000) * 1000000),
HRTIMER_MODE_REL);
}
spin_unlock_irqrestore(&vibr->vibr_lock, flags);
queue_work(vibr->vibr_queue, &vibr->vibr_work);
}
static enum hrtimer_restart mtk_vibrator_timer_func(struct hrtimer *timer)
{
struct reg_vibr *vibr = container_of(timer,
struct reg_vibr, vibr_timer);
vibr->vibr_state = 0;
queue_work(vibr->vibr_queue, &vibr->vibr_work);
return HRTIMER_NORESTART;
}
static const struct of_device_id vibr_of_ids[] = {
{ .compatible = "regulator-vibrator", },
{}
};
static ssize_t activate_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct reg_vibr *vibr = dev_get_drvdata(dev->parent);
return sprintf(buf, "%d\n", vibr->vibr_active);
}
static ssize_t activate_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
unsigned int activate, duration;
ssize_t ret;
struct reg_vibr *vibr = dev_get_drvdata(dev->parent);
ret = kstrtouint(buf, 10, &activate);
if (ret) {
pr_notice("set activate fail\n");
return ret;
}
duration = vibr->vibr_dur;
pr_info("set activate duration = %u, %u\n",
activate, duration);
vibrator_enable(vibr, duration, activate);
ret = size;
return ret;
}
static ssize_t state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct reg_vibr *vibr = dev_get_drvdata(dev->parent);
return sprintf(buf, "%d\n", vibr->vibr_state);
}
static ssize_t state_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
unsigned int state;
ssize_t ret;
struct reg_vibr *vibr = dev_get_drvdata(dev->parent);
ret = kstrtouint(buf, 10, &state);
if (ret) {
pr_notice("set state fail\n");
return ret;
}
vibr->vibr_state = state;
ret = size;
return ret;
}
static ssize_t duration_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct reg_vibr *vibr = dev_get_drvdata(dev->parent);
return sprintf(buf, "%u\n", vibr->vibr_dur);
}
static ssize_t duration_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
unsigned int activate, duration;
ssize_t ret;
struct reg_vibr *vibr;
ret = kstrtouint(buf, 10, &duration);
if (ret) {
pr_notice("set duration fail!\n");
return ret;
}
vibr = dev_get_drvdata(dev->parent);
vibr->vibr_dur = duration;
activate = vibr->vibr_active;
pr_debug("set activate duration = %u, %u\n",
activate, duration);
ret = size;
return ret;
}
static DEVICE_ATTR_RW(activate);
static DEVICE_ATTR_RW(state);
static DEVICE_ATTR_RW(duration);
static struct attribute *activate_attrs[] = {
&dev_attr_activate.attr,
NULL,
};
static struct attribute *state_attrs[] = {
&dev_attr_state.attr,
NULL,
};
static struct attribute *duration_attrs[] = {
&dev_attr_duration.attr,
NULL,
};
static struct attribute_group activate_group = {
.attrs = activate_attrs,
};
static struct attribute_group state_group = {
.attrs = state_attrs,
};
static struct attribute_group duration_group = {
.attrs = duration_attrs,
};
static const struct attribute_group *vibr_group[] = {
&activate_group,
&state_group,
&duration_group,
NULL
};
static struct led_classdev led_vibr = {
.name = "vibrator",
.groups = vibr_group,
};
static int regulator_oc_event(struct notifier_block *nb,
unsigned long event, void *data)
{
struct reg_vibr *vibr = container_of(nb, struct reg_vibr, oc_handle);
switch (event) {
case REGULATOR_EVENT_OVER_CURRENT:
case REGULATOR_EVENT_FAIL:
pr_info("get regulator oc event: %lu", event);
vibr->vibr_oc_state = true;
schedule_work(&vibr->vibr_work);
break;
default:
break;
}
return NOTIFY_OK;
}
static int vib_probe(struct platform_device *pdev)
{
int ret;
struct reg_vibr *m_vibr;
pr_info("probe start +++");
m_vibr = devm_kzalloc(&pdev->dev, sizeof(struct reg_vibr), GFP_KERNEL);
if (!m_vibr) {
ret = -ENOMEM;
goto err;
}
m_vibr->vibr_queue = create_singlethread_workqueue(VIB_DEVICE);
if (!m_vibr->vibr_queue) {
ret = -ENOMEM;
pr_notice("unable to create workqueue!\n");
goto err;
}
ret = mt_vibra_parse_dt(&(pdev->dev), &(m_vibr->vibr_conf));
if (ret) {
pr_notice("failed to parse devicetree(%d)!\n", ret);
goto err;
}
INIT_WORK(&m_vibr->vibr_work, update_vibrator);
spin_lock_init(&m_vibr->vibr_lock);
m_vibr->vibr_shutdown = 0;
m_vibr->oc_handle.notifier_call = regulator_oc_event;
if (m_vibr->vibr_conf.reg == NULL) {
m_vibr->reg_status = 0;
} else {
if (regulator_is_enabled(m_vibr->vibr_conf.reg))
m_vibr->reg_status = 1;
else
m_vibr->reg_status = 0;
/* register oc notification for this regulator */
if (devm_regulator_register_notifier(m_vibr->vibr_conf.reg,
&m_vibr->oc_handle))
pr_info("regulator notifier request failed\n");
}
hrtimer_init(&(m_vibr->vibr_timer), CLOCK_MONOTONIC, HRTIMER_MODE_REL);
m_vibr->vibr_timer.function = mtk_vibrator_timer_func;
ret = devm_led_classdev_register(&pdev->dev, &led_vibr);
if (ret < 0) {
pr_info("led class register fail\n");
goto err;
}
platform_set_drvdata(pdev, m_vibr);
ret = vibr_power_set(m_vibr);
if (ret < 0) {
pr_info("set voltage for regulator fail\n");
goto err;
}
pr_info("probe success, end ---");
return 0;
err:
pr_notice("probe failed(%d), end ---!\n", ret);
return ret;
}
static int vib_remove(struct platform_device *pdev)
{
struct reg_vibr *vibr = platform_get_drvdata(pdev);
cancel_work_sync(&vibr->vibr_work);
hrtimer_cancel(&vibr->vibr_timer);
devm_led_classdev_unregister(&pdev->dev, &led_vibr);
return 0;
}
static void vib_shutdown(struct platform_device *pdev)
{
unsigned long flags;
struct reg_vibr *vibr = platform_get_drvdata(pdev);
pr_info("shutdown: enter!\n");
spin_lock_irqsave(&vibr->vibr_lock, flags);
vibr->vibr_shutdown = 1;
if (vibr->vibr_state) {
vibr->vibr_state = 0;
spin_unlock_irqrestore(&vibr->vibr_lock, flags);
pr_info("vibrator will disable!\n");
vibr_disable(vibr);
} else {
spin_unlock_irqrestore(&vibr->vibr_lock, flags);
}
}
static struct platform_driver vibrator_driver = {
.probe = vib_probe,
.remove = vib_remove,
.shutdown = vib_shutdown,
.driver = {
.name = VIB_DEVICE,
.of_match_table = vibr_of_ids,
},
};
module_platform_driver(vibrator_driver);
MODULE_AUTHOR("Mediatek Corporation");
MODULE_DESCRIPTION("MTK Vibrator Driver (VIB)");
MODULE_LICENSE("GPL");