1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) ST-Ericsson SA 2010 4 * 5 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson 6 * 7 * AB8500 Power-On Key handler 8 */ 9 10 #include <linux/device.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/input.h> 15 #include <linux/interrupt.h> 16 #include <linux/mfd/abx500/ab8500.h> 17 #include <linux/of.h> 18 #include <linux/slab.h> 19 20 /** 21 * struct ab8500_ponkey - ab8500 ponkey information 22 * @input_dev: pointer to input device 23 * @ab8500: ab8500 parent 24 * @irq_dbf: irq number for falling transition 25 * @irq_dbr: irq number for rising transition 26 */ 27 struct ab8500_ponkey { 28 struct input_dev *idev; 29 struct ab8500 *ab8500; 30 int irq_dbf; 31 int irq_dbr; 32 }; 33 34 /* AB8500 gives us an interrupt when ONKEY is held */ 35 static irqreturn_t ab8500_ponkey_handler(int irq, void *data) 36 { 37 struct ab8500_ponkey *ponkey = data; 38 39 if (irq == ponkey->irq_dbf) 40 input_report_key(ponkey->idev, KEY_POWER, true); 41 else if (irq == ponkey->irq_dbr) 42 input_report_key(ponkey->idev, KEY_POWER, false); 43 44 input_sync(ponkey->idev); 45 46 return IRQ_HANDLED; 47 } 48 49 static int ab8500_ponkey_probe(struct platform_device *pdev) 50 { 51 struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); 52 struct ab8500_ponkey *ponkey; 53 struct input_dev *input; 54 int irq_dbf, irq_dbr; 55 int error; 56 57 irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF"); 58 if (irq_dbf < 0) 59 return irq_dbf; 60 61 irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR"); 62 if (irq_dbr < 0) 63 return irq_dbr; 64 65 ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey), 66 GFP_KERNEL); 67 if (!ponkey) 68 return -ENOMEM; 69 70 input = devm_input_allocate_device(&pdev->dev); 71 if (!input) 72 return -ENOMEM; 73 74 ponkey->idev = input; 75 ponkey->ab8500 = ab8500; 76 ponkey->irq_dbf = irq_dbf; 77 ponkey->irq_dbr = irq_dbr; 78 79 input->name = "AB8500 POn(PowerOn) Key"; 80 input->dev.parent = &pdev->dev; 81 82 input_set_capability(input, EV_KEY, KEY_POWER); 83 84 error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf, 85 ab8500_ponkey_handler, 0, 86 "ab8500-ponkey-dbf", ponkey); 87 if (error < 0) { 88 dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n", 89 ponkey->irq_dbf, error); 90 return error; 91 } 92 93 error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr, 94 ab8500_ponkey_handler, 0, 95 "ab8500-ponkey-dbr", ponkey); 96 if (error < 0) { 97 dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n", 98 ponkey->irq_dbr, error); 99 return error; 100 } 101 102 error = input_register_device(ponkey->idev); 103 if (error) { 104 dev_err(ab8500->dev, "Can't register input device: %d\n", error); 105 return error; 106 } 107 108 return 0; 109 } 110 111 #ifdef CONFIG_OF 112 static const struct of_device_id ab8500_ponkey_match[] = { 113 { .compatible = "stericsson,ab8500-ponkey", }, 114 {} 115 }; 116 MODULE_DEVICE_TABLE(of, ab8500_ponkey_match); 117 #endif 118 119 static struct platform_driver ab8500_ponkey_driver = { 120 .driver = { 121 .name = "ab8500-poweron-key", 122 .of_match_table = of_match_ptr(ab8500_ponkey_match), 123 }, 124 .probe = ab8500_ponkey_probe, 125 }; 126 module_platform_driver(ab8500_ponkey_driver); 127 128 MODULE_LICENSE("GPL v2"); 129 MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); 130 MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver"); 131