Moritz Fischer | 846a7fc | 2015-01-10 14:04:14 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2014, National Instruments Corp. All rights reserved. |
| 3 | * |
| 4 | * Driver for NI Ettus Research USRP E3x0 Button Driver |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/input.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/slab.h> |
| 24 | |
| 25 | static irqreturn_t e3x0_button_release_handler(int irq, void *data) |
| 26 | { |
| 27 | struct input_dev *idev = data; |
| 28 | |
| 29 | input_report_key(idev, KEY_POWER, 0); |
| 30 | input_sync(idev); |
| 31 | |
| 32 | return IRQ_HANDLED; |
| 33 | } |
| 34 | |
| 35 | static irqreturn_t e3x0_button_press_handler(int irq, void *data) |
| 36 | { |
| 37 | struct input_dev *idev = data; |
| 38 | |
| 39 | input_report_key(idev, KEY_POWER, 1); |
| 40 | pm_wakeup_event(idev->dev.parent, 0); |
| 41 | input_sync(idev); |
| 42 | |
| 43 | return IRQ_HANDLED; |
| 44 | } |
| 45 | |
| 46 | static int __maybe_unused e3x0_button_suspend(struct device *dev) |
| 47 | { |
| 48 | struct platform_device *pdev = to_platform_device(dev); |
| 49 | |
| 50 | if (device_may_wakeup(dev)) |
| 51 | enable_irq_wake(platform_get_irq_byname(pdev, "press")); |
| 52 | |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int __maybe_unused e3x0_button_resume(struct device *dev) |
| 57 | { |
| 58 | struct platform_device *pdev = to_platform_device(dev); |
| 59 | |
| 60 | if (device_may_wakeup(dev)) |
| 61 | disable_irq_wake(platform_get_irq_byname(pdev, "press")); |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static SIMPLE_DEV_PM_OPS(e3x0_button_pm_ops, |
| 67 | e3x0_button_suspend, e3x0_button_resume); |
| 68 | |
| 69 | static int e3x0_button_probe(struct platform_device *pdev) |
| 70 | { |
| 71 | struct input_dev *input; |
| 72 | int irq_press, irq_release; |
| 73 | int error; |
| 74 | |
| 75 | irq_press = platform_get_irq_byname(pdev, "press"); |
| 76 | if (irq_press < 0) { |
| 77 | dev_err(&pdev->dev, "No IRQ for 'press', error=%d\n", |
| 78 | irq_press); |
| 79 | return irq_press; |
| 80 | } |
| 81 | |
| 82 | irq_release = platform_get_irq_byname(pdev, "release"); |
| 83 | if (irq_release < 0) { |
| 84 | dev_err(&pdev->dev, "No IRQ for 'release', error=%d\n", |
| 85 | irq_release); |
| 86 | return irq_release; |
| 87 | } |
| 88 | |
| 89 | input = devm_input_allocate_device(&pdev->dev); |
| 90 | if (!input) |
| 91 | return -ENOMEM; |
| 92 | |
| 93 | input->name = "NI Ettus Research USRP E3x0 Button Driver"; |
| 94 | input->phys = "e3x0_button/input0"; |
| 95 | input->dev.parent = &pdev->dev; |
| 96 | |
| 97 | input_set_capability(input, EV_KEY, KEY_POWER); |
| 98 | |
| 99 | error = devm_request_irq(&pdev->dev, irq_press, |
| 100 | e3x0_button_press_handler, 0, |
| 101 | "e3x0-button", input); |
| 102 | if (error) { |
| 103 | dev_err(&pdev->dev, "Failed to request 'press' IRQ#%d: %d\n", |
| 104 | irq_press, error); |
| 105 | return error; |
| 106 | } |
| 107 | |
| 108 | error = devm_request_irq(&pdev->dev, irq_release, |
| 109 | e3x0_button_release_handler, 0, |
| 110 | "e3x0-button", input); |
| 111 | if (error) { |
| 112 | dev_err(&pdev->dev, "Failed to request 'release' IRQ#%d: %d\n", |
| 113 | irq_release, error); |
| 114 | return error; |
| 115 | } |
| 116 | |
| 117 | error = input_register_device(input); |
| 118 | if (error) { |
| 119 | dev_err(&pdev->dev, "Can't register input device: %d\n", error); |
| 120 | return error; |
| 121 | } |
| 122 | |
Moritz Fischer | 846a7fc | 2015-01-10 14:04:14 -0800 | [diff] [blame] | 123 | device_init_wakeup(&pdev->dev, 1); |
| 124 | return 0; |
| 125 | } |
| 126 | |
Moritz Fischer | 846a7fc | 2015-01-10 14:04:14 -0800 | [diff] [blame] | 127 | #ifdef CONFIG_OF |
| 128 | static const struct of_device_id e3x0_button_match[] = { |
| 129 | { .compatible = "ettus,e3x0-button", }, |
| 130 | { } |
| 131 | }; |
| 132 | MODULE_DEVICE_TABLE(of, e3x0_button_match); |
| 133 | #endif |
| 134 | |
| 135 | static struct platform_driver e3x0_button_driver = { |
| 136 | .driver = { |
| 137 | .name = "e3x0-button", |
| 138 | .of_match_table = of_match_ptr(e3x0_button_match), |
| 139 | .pm = &e3x0_button_pm_ops, |
| 140 | }, |
| 141 | .probe = e3x0_button_probe, |
Moritz Fischer | 846a7fc | 2015-01-10 14:04:14 -0800 | [diff] [blame] | 142 | }; |
| 143 | |
| 144 | module_platform_driver(e3x0_button_driver); |
| 145 | |
| 146 | MODULE_LICENSE("GPL v2"); |
| 147 | MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>"); |
| 148 | MODULE_DESCRIPTION("NI Ettus Research USRP E3x0 Button driver"); |
| 149 | MODULE_ALIAS("platform:e3x0-button"); |