1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2012, Code Aurora Forum. All rights reserved. 3 */ 4 5 #include <linux/kernel.h> 6 #include <linux/init.h> 7 #include <linux/module.h> 8 #include <linux/interrupt.h> 9 #include <linux/gpio/consumer.h> 10 #include <linux/slab.h> 11 #include <linux/of.h> 12 #include <linux/of_gpio.h> 13 #include <linux/platform_device.h> 14 #include <linux/irq.h> 15 #include <media/rc-core.h> 16 17 #define GPIO_IR_DEVICE_NAME "gpio_ir_recv" 18 19 struct gpio_rc_dev { 20 struct rc_dev *rcdev; 21 struct gpio_desc *gpiod; 22 int irq; 23 }; 24 25 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id) 26 { 27 int val; 28 struct gpio_rc_dev *gpio_dev = dev_id; 29 30 val = gpiod_get_value(gpio_dev->gpiod); 31 if (val >= 0) 32 ir_raw_event_store_edge(gpio_dev->rcdev, val == 1); 33 34 return IRQ_HANDLED; 35 } 36 37 static int gpio_ir_recv_probe(struct platform_device *pdev) 38 { 39 struct device *dev = &pdev->dev; 40 struct device_node *np = dev->of_node; 41 struct gpio_rc_dev *gpio_dev; 42 struct rc_dev *rcdev; 43 int rc; 44 45 if (!np) 46 return -ENODEV; 47 48 gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL); 49 if (!gpio_dev) 50 return -ENOMEM; 51 52 gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN); 53 if (IS_ERR(gpio_dev->gpiod)) { 54 rc = PTR_ERR(gpio_dev->gpiod); 55 /* Just try again if this happens */ 56 if (rc != -EPROBE_DEFER) 57 dev_err(dev, "error getting gpio (%d)\n", rc); 58 return rc; 59 } 60 gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod); 61 if (gpio_dev->irq < 0) 62 return gpio_dev->irq; 63 64 rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW); 65 if (!rcdev) 66 return -ENOMEM; 67 68 rcdev->priv = gpio_dev; 69 rcdev->device_name = GPIO_IR_DEVICE_NAME; 70 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0"; 71 rcdev->input_id.bustype = BUS_HOST; 72 rcdev->input_id.vendor = 0x0001; 73 rcdev->input_id.product = 0x0001; 74 rcdev->input_id.version = 0x0100; 75 rcdev->dev.parent = dev; 76 rcdev->driver_name = KBUILD_MODNAME; 77 rcdev->min_timeout = 1; 78 rcdev->timeout = IR_DEFAULT_TIMEOUT; 79 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT; 80 rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 81 rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL); 82 if (!rcdev->map_name) 83 rcdev->map_name = RC_MAP_EMPTY; 84 85 gpio_dev->rcdev = rcdev; 86 87 rc = devm_rc_register_device(dev, rcdev); 88 if (rc < 0) { 89 dev_err(dev, "failed to register rc device (%d)\n", rc); 90 return rc; 91 } 92 93 platform_set_drvdata(pdev, gpio_dev); 94 95 return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq, 96 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, 97 "gpio-ir-recv-irq", gpio_dev); 98 } 99 100 #ifdef CONFIG_PM 101 static int gpio_ir_recv_suspend(struct device *dev) 102 { 103 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 104 105 if (device_may_wakeup(dev)) 106 enable_irq_wake(gpio_dev->irq); 107 else 108 disable_irq(gpio_dev->irq); 109 110 return 0; 111 } 112 113 static int gpio_ir_recv_resume(struct device *dev) 114 { 115 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev); 116 117 if (device_may_wakeup(dev)) 118 disable_irq_wake(gpio_dev->irq); 119 else 120 enable_irq(gpio_dev->irq); 121 122 return 0; 123 } 124 125 static const struct dev_pm_ops gpio_ir_recv_pm_ops = { 126 .suspend = gpio_ir_recv_suspend, 127 .resume = gpio_ir_recv_resume, 128 }; 129 #endif 130 131 static const struct of_device_id gpio_ir_recv_of_match[] = { 132 { .compatible = "gpio-ir-receiver", }, 133 { }, 134 }; 135 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match); 136 137 static struct platform_driver gpio_ir_recv_driver = { 138 .probe = gpio_ir_recv_probe, 139 .driver = { 140 .name = KBUILD_MODNAME, 141 .of_match_table = of_match_ptr(gpio_ir_recv_of_match), 142 #ifdef CONFIG_PM 143 .pm = &gpio_ir_recv_pm_ops, 144 #endif 145 }, 146 }; 147 module_platform_driver(gpio_ir_recv_driver); 148 149 MODULE_DESCRIPTION("GPIO IR Receiver driver"); 150 MODULE_LICENSE("GPL v2"); 151