1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014, National Instruments Corp. All rights reserved. 4 * 5 * Driver for NI Ettus Research USRP E3x0 Button Driver 6 */ 7 8 #include <linux/device.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 #include <linux/input.h> 13 #include <linux/interrupt.h> 14 #include <linux/of.h> 15 #include <linux/slab.h> 16 17 static irqreturn_t e3x0_button_release_handler(int irq, void *data) 18 { 19 struct input_dev *idev = data; 20 21 input_report_key(idev, KEY_POWER, 0); 22 input_sync(idev); 23 24 return IRQ_HANDLED; 25 } 26 27 static irqreturn_t e3x0_button_press_handler(int irq, void *data) 28 { 29 struct input_dev *idev = data; 30 31 input_report_key(idev, KEY_POWER, 1); 32 pm_wakeup_event(idev->dev.parent, 0); 33 input_sync(idev); 34 35 return IRQ_HANDLED; 36 } 37 38 static int __maybe_unused e3x0_button_suspend(struct device *dev) 39 { 40 struct platform_device *pdev = to_platform_device(dev); 41 42 if (device_may_wakeup(dev)) 43 enable_irq_wake(platform_get_irq_byname(pdev, "press")); 44 45 return 0; 46 } 47 48 static int __maybe_unused e3x0_button_resume(struct device *dev) 49 { 50 struct platform_device *pdev = to_platform_device(dev); 51 52 if (device_may_wakeup(dev)) 53 disable_irq_wake(platform_get_irq_byname(pdev, "press")); 54 55 return 0; 56 } 57 58 static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops, 59 e3x0_button_suspend, e3x0_button_resume); 60 61 static int e3x0_button_probe(struct platform_device *pdev) 62 { 63 struct input_dev *input; 64 int irq_press, irq_release; 65 int error; 66 67 irq_press = platform_get_irq_byname(pdev, "press"); 68 if (irq_press < 0) 69 return irq_press; 70 71 irq_release = platform_get_irq_byname(pdev, "release"); 72 if (irq_release < 0) 73 return irq_release; 74 75 input = devm_input_allocate_device(&pdev->dev); 76 if (!input) 77 return -ENOMEM; 78 79 input->name = "NI Ettus Research USRP E3x0 Button Driver"; 80 input->phys = "e3x0_button/input0"; 81 input->dev.parent = &pdev->dev; 82 83 input_set_capability(input, EV_KEY, KEY_POWER); 84 85 error = devm_request_irq(&pdev->dev, irq_press, 86 e3x0_button_press_handler, 0, 87 "e3x0-button", input); 88 if (error) { 89 dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n", 90 irq_press, error); 91 return error; 92 } 93 94 error = devm_request_irq(&pdev->dev, irq_release, 95 e3x0_button_release_handler, 0, 96 "e3x0-button", input); 97 if (error) { 98 dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n", 99 irq_release, error); 100 return error; 101 } 102 103 error = input_register_device(input); 104 if (error) { 105 dev_err(&pdev->dev, "Can't register input device: %d\n", error); 106 return error; 107 } 108 109 device_init_wakeup(&pdev->dev, 1); 110 return 0; 111 } 112 113 #ifdef CONFIG_OF 114 static const struct of_device_id e3x0_button_match[] = { 115 { .compatible = "ettus,e3x0-button", }, 116 { } 117 }; 118 MODULE_DEVICE_TABLE(of, e3x0_button_match); 119 #endif 120 121 static struct platform_driver e3x0_button_driver = { 122 .driver = { 123 .name = "e3x0-button", 124 .of_match_table = of_match_ptr(e3x0_button_match), 125 .pm = &e3x0_button_pm_ops, 126 }, 127 .probe = e3x0_button_probe, 128 }; 129 130 module_platform_driver(e3x0_button_driver); 131 132 MODULE_LICENSE("GPL v2"); 133 MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>"); 134 MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver"); 135 MODULE_ALIAS("platform:e3x0-button"); 136