* [PATCH v1 3/3] Vibrator: Add regulator vibrator driver
2020-04-29 8:17 [PATCH v1] Add support for MediaTek regulator vibrator driver Xing Zhang
2020-04-29 8:17 ` [PATCH v1 1/3] dt-bindings: add regulator vibrator documentation Xing Zhang
2020-04-29 8:18 ` [PATCH v1 2/3] arm64: mediatek: Add regulator vibrator support Xing Zhang
@ 2020-04-29 8:18 ` Xing Zhang
2020-05-07 17:45 ` [PATCH v1] Add support for MediaTek " Pavel Machek
3 siblings, 0 replies; 7+ messages in thread
From: Xing Zhang @ 2020-04-29 8:18 UTC (permalink / raw)
To: Matthias Brugger, Jacek Anaszewski, Pavel Machek, Dan Murphy
Cc: linux-arm-kernel, linux-mediatek, linux-kernel, linux-leds, Xing Zhang
From: Xing Zhang <xing.zhang@mediatek.com>
This adds support for trgulator vibrator
The vibration time is controlled by a timer,
just like other led devices
Signed-off-by: Xing Zhang <xing.zhang@mediatek.com>
---
drivers/leds/Kconfig | 10 +
drivers/leds/Makefile | 1 +
drivers/leds/regulator-vibrator.c | 450 ++++++++++++++++++++++++++++++
3 files changed, 461 insertions(+)
create mode 100644 drivers/leds/regulator-vibrator.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index c664d84e1667..190046e8d386 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -846,6 +846,16 @@ config LEDS_TPS6105X
It is a single boost converter primarily for white LEDs and
audio amplifiers.
+config LEDS_REGULATOR_VIBRATOR
+ tristate "LED regulator vibrator support"
+ depends on LEDS_CLASS
+ help
+ This option enables support for LED regulator vibrator.
+ say 'y' to enable this
+
+ To compile this driver as a module, choose 'M' here: the module
+ will be called regulator-vibrator.
+
config LEDS_IP30
tristate "LED support for SGI Octane machines"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 45235d5fb218..46c7bdc51f99 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_LEDS_LM3532) += leds-lm3532.o
obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o
obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o
+obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o
obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o
obj-$(CONFIG_LEDS_LM3642) += leds-lm3642.o
obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
diff --git a/drivers/leds/regulator-vibrator.c b/drivers/leds/regulator-vibrator.c
new file mode 100644
index 000000000000..606a30bce19a
--- /dev/null
+++ b/drivers/leds/regulator-vibrator.c
@@ -0,0 +1,450 @@
+// 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; /* hrtimer lock */
+ unsigned int vibr_dur;
+ bool vibr_active;
+ bool vibr_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;
+
+ 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->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->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_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 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_disable(vibr);
+ 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;
+ if (regulator_is_enabled(m_vibr->vibr_conf.reg))
+ m_vibr->reg_status = 1;
+ else
+ m_vibr->reg_status = 0;
+
+ hrtimer_init(&m_vibr->vibr_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ m_vibr->vibr_timer.function = vibrator_timer_func;
+ ret = devm_led_classdev_register(&pdev->dev, &led_vibr);
+ if (ret < 0) {
+ pr_info("led class register fail\n");
+ goto err;
+ }
+
+ /* register oc notification for this regulator */
+ m_vibr->oc_handle.notifier_call = regulator_oc_event;
+ ret = devm_regulator_register_notifier(m_vibr->vibr_conf.reg,
+ &m_vibr->oc_handle);
+ if (ret)
+ pr_info("regulator notifier request failed\n");
+
+ 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("Regulator Vibrator Driver (VIB)");
+MODULE_LICENSE("GPL");
--
2.18.0
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