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/kernel.h> 11 #include <linux/module.h> 12 #include <linux/platform_device.h> 13 #include <linux/input.h> 14 #include <linux/interrupt.h> 15 #include <linux/mfd/ab8500.h> 16 #include <linux/slab.h> 17 18 /** 19 * struct ab8500_ponkey - ab8500 ponkey information 20 * @input_dev: pointer to input device 21 * @ab8500: ab8500 parent 22 * @irq_dbf: irq number for falling transition 23 * @irq_dbr: irq number for rising transition 24 */ 25 struct ab8500_ponkey { 26 struct input_dev *idev; 27 struct ab8500 *ab8500; 28 int irq_dbf; 29 int irq_dbr; 30 }; 31 32 /* AB8500 gives us an interrupt when ONKEY is held */ 33 static irqreturn_t ab8500_ponkey_handler(int irq, void *data) 34 { 35 struct ab8500_ponkey *ponkey = data; 36 37 if (irq == ponkey->irq_dbf) 38 input_report_key(ponkey->idev, KEY_POWER, true); 39 else if (irq == ponkey->irq_dbr) 40 input_report_key(ponkey->idev, KEY_POWER, false); 41 42 input_sync(ponkey->idev); 43 44 return IRQ_HANDLED; 45 } 46 47 static int __devinit ab8500_ponkey_probe(struct platform_device *pdev) 48 { 49 struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); 50 struct ab8500_ponkey *ponkey; 51 struct input_dev *input; 52 int irq_dbf, irq_dbr; 53 int error; 54 55 irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF"); 56 if (irq_dbf < 0) { 57 dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf); 58 return irq_dbf; 59 } 60 61 irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR"); 62 if (irq_dbr < 0) { 63 dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr); 64 return irq_dbr; 65 } 66 67 ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL); 68 input = input_allocate_device(); 69 if (!ponkey || !input) { 70 error = -ENOMEM; 71 goto err_free_mem; 72 } 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 = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler, 85 0, "ab8500-ponkey-dbf", ponkey); 86 if (error < 0) { 87 dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n", 88 ponkey->irq_dbf, error); 89 goto err_free_mem; 90 } 91 92 error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler, 93 0, "ab8500-ponkey-dbr", ponkey); 94 if (error < 0) { 95 dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n", 96 ponkey->irq_dbr, error); 97 goto err_free_dbf_irq; 98 } 99 100 error = input_register_device(ponkey->idev); 101 if (error) { 102 dev_err(ab8500->dev, "Can't register input device: %d\n", error); 103 goto err_free_dbr_irq; 104 } 105 106 platform_set_drvdata(pdev, ponkey); 107 return 0; 108 109 err_free_dbr_irq: 110 free_irq(ponkey->irq_dbr, ponkey); 111 err_free_dbf_irq: 112 free_irq(ponkey->irq_dbf, ponkey); 113 err_free_mem: 114 input_free_device(input); 115 kfree(ponkey); 116 117 return error; 118 } 119 120 static int __devexit ab8500_ponkey_remove(struct platform_device *pdev) 121 { 122 struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev); 123 124 free_irq(ponkey->irq_dbf, ponkey); 125 free_irq(ponkey->irq_dbr, ponkey); 126 input_unregister_device(ponkey->idev); 127 kfree(ponkey); 128 129 platform_set_drvdata(pdev, NULL); 130 131 return 0; 132 } 133 134 static struct platform_driver ab8500_ponkey_driver = { 135 .driver = { 136 .name = "ab8500-poweron-key", 137 .owner = THIS_MODULE, 138 }, 139 .probe = ab8500_ponkey_probe, 140 .remove = __devexit_p(ab8500_ponkey_remove), 141 }; 142 143 static int __init ab8500_ponkey_init(void) 144 { 145 return platform_driver_register(&ab8500_ponkey_driver); 146 } 147 module_init(ab8500_ponkey_init); 148 149 static void __exit ab8500_ponkey_exit(void) 150 { 151 platform_driver_unregister(&ab8500_ponkey_driver); 152 } 153 module_exit(ab8500_ponkey_exit); 154 155 MODULE_LICENSE("GPL v2"); 156 MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); 157 MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver"); 158