254 lines
6.0 KiB
C
254 lines
6.0 KiB
C
/* 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.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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#include <media/gpio-ir-recv.h>
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#define GPIO_IR_DRIVER_NAME "gpio-rc-recv"
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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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int gpio_nr;
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bool active_low;
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};
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#ifdef CONFIG_OF
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/*
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* Translate OpenFirmware node properties into platform_data
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*/
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static int gpio_ir_recv_get_devtree_pdata(struct device *dev,
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struct gpio_ir_recv_platform_data *pdata)
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{
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struct device_node *np = dev->of_node;
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enum of_gpio_flags flags;
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int gpio;
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gpio = of_get_gpio_flags(np, 0, &flags);
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if (gpio < 0) {
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if (gpio != -EPROBE_DEFER)
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dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
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return gpio;
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}
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pdata->gpio_nr = gpio;
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pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);
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/* probe() takes care of map_name == NULL or allowed_protos == 0 */
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pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
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pdata->allowed_protos = 0;
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return 0;
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}
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static 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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#else /* !CONFIG_OF */
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#define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS)
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#endif
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static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
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{
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struct gpio_rc_dev *gpio_dev = dev_id;
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int gval;
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int rc = 0;
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enum raw_event_type type = IR_SPACE;
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gval = gpio_get_value_cansleep(gpio_dev->gpio_nr);
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if (gval < 0)
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goto err_get_value;
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if (gpio_dev->active_low)
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gval = !gval;
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if (gval == 1)
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type = IR_PULSE;
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rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
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if (rc < 0)
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goto err_get_value;
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ir_raw_event_handle(gpio_dev->rcdev);
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err_get_value:
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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 gpio_rc_dev *gpio_dev;
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struct rc_dev *rcdev;
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const struct gpio_ir_recv_platform_data *pdata =
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pdev->dev.platform_data;
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int rc;
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if (pdev->dev.of_node) {
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struct gpio_ir_recv_platform_data *dtpdata =
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devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
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if (!dtpdata)
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return -ENOMEM;
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rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);
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if (rc)
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return rc;
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pdata = dtpdata;
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}
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if (!pdata)
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return -EINVAL;
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if (pdata->gpio_nr < 0)
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return -EINVAL;
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gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
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if (!gpio_dev)
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return -ENOMEM;
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rcdev = rc_allocate_device();
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if (!rcdev) {
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rc = -ENOMEM;
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goto err_allocate_device;
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}
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rcdev->priv = gpio_dev;
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rcdev->driver_type = RC_DRIVER_IR_RAW;
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rcdev->input_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 = &pdev->dev;
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rcdev->driver_name = GPIO_IR_DRIVER_NAME;
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if (pdata->allowed_protos)
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rcdev->allowed_protocols = pdata->allowed_protos;
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else
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rcdev->allowed_protocols = RC_BIT_ALL;
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rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
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gpio_dev->rcdev = rcdev;
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gpio_dev->gpio_nr = pdata->gpio_nr;
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gpio_dev->active_low = pdata->active_low;
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rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
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if (rc < 0)
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goto err_gpio_request;
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rc = gpio_direction_input(pdata->gpio_nr);
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if (rc < 0)
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goto err_gpio_direction_input;
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rc = rc_register_device(rcdev);
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if (rc < 0) {
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dev_err(&pdev->dev, "failed to register rc device\n");
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goto err_register_rc_device;
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}
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platform_set_drvdata(pdev, gpio_dev);
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rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
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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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if (rc < 0)
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goto err_request_irq;
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return 0;
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err_request_irq:
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rc_unregister_device(rcdev);
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rcdev = NULL;
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err_register_rc_device:
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err_gpio_direction_input:
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gpio_free(pdata->gpio_nr);
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err_gpio_request:
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rc_free_device(rcdev);
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err_allocate_device:
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kfree(gpio_dev);
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return rc;
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}
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static int gpio_ir_recv_remove(struct platform_device *pdev)
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{
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struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
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free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
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rc_unregister_device(gpio_dev->rcdev);
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gpio_free(gpio_dev->gpio_nr);
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kfree(gpio_dev);
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return 0;
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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 platform_device *pdev = to_platform_device(dev);
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struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
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if (device_may_wakeup(dev))
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enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
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else
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disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
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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 platform_device *pdev = to_platform_device(dev);
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struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
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if (device_may_wakeup(dev))
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disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
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else
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enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
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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 struct platform_driver gpio_ir_recv_driver = {
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.probe = gpio_ir_recv_probe,
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.remove = gpio_ir_recv_remove,
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.driver = {
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.name = GPIO_IR_DRIVER_NAME,
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.owner = THIS_MODULE,
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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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