159 lines
4 KiB
C
159 lines
4 KiB
C
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/* Copyright (c) 2012, Code Aurora Forum. 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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#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/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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};
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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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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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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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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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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 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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};
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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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