| 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 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 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 DEFINE_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 = pm_sleep_ptr(&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"); |