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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/pm_qos.h>
#include <linux/irq.h>
#include <media/rc-core.h>
#define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
struct gpio_rc_dev {
struct rc_dev *rcdev;
struct gpio_desc *gpiod;
int irq;
struct device *pmdev;
struct pm_qos_request qos;
};
static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
{
int val;
struct gpio_rc_dev *gpio_dev = dev_id;
struct device *pmdev = gpio_dev->pmdev;
/*
* For some cpuidle systems, not all:
* Respond to interrupt taking more latency when cpu in idle.
* Invoke asynchronous pm runtime get from interrupt context,
* this may introduce a millisecond delay to call resume callback,
* where to disable cpuilde.
*
* Two issues lead to fail to decode first frame, one is latency to
* respond to interrupt, another is delay introduced by async api.
*/
if (pmdev)
pm_runtime_get(pmdev);
val = gpiod_get_value(gpio_dev->gpiod);
if (val >= 0)
ir_raw_event_store_edge(gpio_dev->rcdev, val == 1);
if (pmdev) {
pm_runtime_mark_last_busy(pmdev);
pm_runtime_put_autosuspend(pmdev);
}
return IRQ_HANDLED;
}
static int gpio_ir_recv_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct gpio_rc_dev *gpio_dev;
struct rc_dev *rcdev;
u32 period = 0;
int rc;
if (!np)
return -ENODEV;
gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL);
if (!gpio_dev)
return -ENOMEM;
gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
if (IS_ERR(gpio_dev->gpiod)) {
rc = PTR_ERR(gpio_dev->gpiod);
/* Just try again if this happens */
if (rc != -EPROBE_DEFER)
dev_err(dev, "error getting gpio (%d)\n", rc);
return rc;
}
gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod);
if (gpio_dev->irq < 0)
return gpio_dev->irq;
rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
if (!rcdev)
return -ENOMEM;
rcdev->priv = gpio_dev;
rcdev->device_name = GPIO_IR_DEVICE_NAME;
rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
rcdev->input_id.bustype = BUS_HOST;
rcdev->input_id.vendor = 0x0001;
rcdev->input_id.product = 0x0001;
rcdev->input_id.version = 0x0100;
rcdev->dev.parent = dev;
rcdev->driver_name = KBUILD_MODNAME;
rcdev->min_timeout = 1;
rcdev->timeout = IR_DEFAULT_TIMEOUT;
rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL);
if (!rcdev->map_name)
rcdev->map_name = RC_MAP_EMPTY;
gpio_dev->rcdev = rcdev;
rc = devm_rc_register_device(dev, rcdev);
if (rc < 0) {
dev_err(dev, "failed to register rc device (%d)\n", rc);
return rc;
}
of_property_read_u32(np, "linux,autosuspend-period", &period);
if (period) {
gpio_dev->pmdev = dev;
pm_runtime_set_autosuspend_delay(dev, period);
pm_runtime_use_autosuspend(dev);
pm_runtime_set_suspended(dev);
pm_runtime_enable(dev);
}
platform_set_drvdata(pdev, gpio_dev);
return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"gpio-ir-recv-irq", gpio_dev);
}
#ifdef CONFIG_PM
static int gpio_ir_recv_suspend(struct device *dev)
{
struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
enable_irq_wake(gpio_dev->irq);
else
disable_irq(gpio_dev->irq);
return 0;
}
static int gpio_ir_recv_resume(struct device *dev)
{
struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
disable_irq_wake(gpio_dev->irq);
else
enable_irq(gpio_dev->irq);
return 0;
}
static int gpio_ir_recv_runtime_suspend(struct device *dev)
{
struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
cpu_latency_qos_remove_request(&gpio_dev->qos);
return 0;
}
static int gpio_ir_recv_runtime_resume(struct device *dev)
{
struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
cpu_latency_qos_add_request(&gpio_dev->qos, 0);
return 0;
}
static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
.suspend = gpio_ir_recv_suspend,
.resume = gpio_ir_recv_resume,
.runtime_suspend = gpio_ir_recv_runtime_suspend,
.runtime_resume = gpio_ir_recv_runtime_resume,
};
#endif
static const struct of_device_id gpio_ir_recv_of_match[] = {
{ .compatible = "gpio-ir-receiver", },
{ },
};
MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
static struct platform_driver gpio_ir_recv_driver = {
.probe = gpio_ir_recv_probe,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = of_match_ptr(gpio_ir_recv_of_match),
#ifdef CONFIG_PM
.pm = &gpio_ir_recv_pm_ops,
#endif
},
};
module_platform_driver(gpio_ir_recv_driver);
MODULE_DESCRIPTION("GPIO IR Receiver driver");
MODULE_LICENSE("GPL v2");
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