1 /* 2 * Copyright (C) ST-Ericsson SA 2010 3 * 4 * License Terms: GNU General Public License v2 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 dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf); 60 return irq_dbf; 61 } 62 63 irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR"); 64 if (irq_dbr < 0) { 65 dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr); 66 return irq_dbr; 67 } 68 69 ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey), 70 GFP_KERNEL); 71 if (!ponkey) 72 return -ENOMEM; 73 74 input = devm_input_allocate_device(&pdev->dev); 75 if (!input) 76 return -ENOMEM; 77 78 ponkey->idev = input; 79 ponkey->ab8500 = ab8500; 80 ponkey->irq_dbf = irq_dbf; 81 ponkey->irq_dbr = irq_dbr; 82 83 input->name = "AB8500 POn(PowerOn) Key"; 84 input->dev.parent = &pdev->dev; 85 86 input_set_capability(input, EV_KEY, KEY_POWER); 87 88 error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf, 89 ab8500_ponkey_handler, 0, 90 "ab8500-ponkey-dbf", ponkey); 91 if (error < 0) { 92 dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n", 93 ponkey->irq_dbf, error); 94 return error; 95 } 96 97 error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr, 98 ab8500_ponkey_handler, 0, 99 "ab8500-ponkey-dbr", ponkey); 100 if (error < 0) { 101 dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n", 102 ponkey->irq_dbr, error); 103 return error; 104 } 105 106 error = input_register_device(ponkey->idev); 107 if (error) { 108 dev_err(ab8500->dev, "Can't register input device: %d\n", error); 109 return error; 110 } 111 112 platform_set_drvdata(pdev, ponkey); 113 return 0; 114 } 115 116 #ifdef CONFIG_OF 117 static const struct of_device_id ab8500_ponkey_match[] = { 118 { .compatible = "stericsson,ab8500-ponkey", }, 119 {} 120 }; 121 MODULE_DEVICE_TABLE(of, ab8500_ponkey_match); 122 #endif 123 124 static struct platform_driver ab8500_ponkey_driver = { 125 .driver = { 126 .name = "ab8500-poweron-key", 127 .of_match_table = of_match_ptr(ab8500_ponkey_match), 128 }, 129 .probe = ab8500_ponkey_probe, 130 }; 131 module_platform_driver(ab8500_ponkey_driver); 132 133 MODULE_LICENSE("GPL v2"); 134 MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); 135 MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver"); 136