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