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/abx500/ab8500.h> 16 #include <linux/of.h> 17 #include <linux/slab.h> 18 19 /** 20 * struct ab8500_ponkey - ab8500 ponkey information 21 * @input_dev: pointer to input device 22 * @ab8500: ab8500 parent 23 * @irq_dbf: irq number for falling transition 24 * @irq_dbr: irq number for rising transition 25 */ 26 struct ab8500_ponkey { 27 struct input_dev *idev; 28 struct ab8500 *ab8500; 29 int irq_dbf; 30 int irq_dbr; 31 }; 32 33 /* AB8500 gives us an interrupt when ONKEY is held */ 34 static irqreturn_t ab8500_ponkey_handler(int irq, void *data) 35 { 36 struct ab8500_ponkey *ponkey = data; 37 38 if (irq == ponkey->irq_dbf) 39 input_report_key(ponkey->idev, KEY_POWER, true); 40 else if (irq == ponkey->irq_dbr) 41 input_report_key(ponkey->idev, KEY_POWER, false); 42 43 input_sync(ponkey->idev); 44 45 return IRQ_HANDLED; 46 } 47 48 static int ab8500_ponkey_probe(struct platform_device *pdev) 49 { 50 struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); 51 struct ab8500_ponkey *ponkey; 52 struct input_dev *input; 53 int irq_dbf, irq_dbr; 54 int error; 55 56 irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF"); 57 if (irq_dbf < 0) { 58 dev_err(&pdev->dev, "No IRQ for ONKEY_DBF, error=%d\n", irq_dbf); 59 return irq_dbf; 60 } 61 62 irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR"); 63 if (irq_dbr < 0) { 64 dev_err(&pdev->dev, "No IRQ for ONKEY_DBR, error=%d\n", irq_dbr); 65 return irq_dbr; 66 } 67 68 ponkey = kzalloc(sizeof(struct ab8500_ponkey), GFP_KERNEL); 69 input = input_allocate_device(); 70 if (!ponkey || !input) { 71 error = -ENOMEM; 72 goto err_free_mem; 73 } 74 75 ponkey->idev = input; 76 ponkey->ab8500 = ab8500; 77 ponkey->irq_dbf = irq_dbf; 78 ponkey->irq_dbr = irq_dbr; 79 80 input->name = "AB8500 POn(PowerOn) Key"; 81 input->dev.parent = &pdev->dev; 82 83 input_set_capability(input, EV_KEY, KEY_POWER); 84 85 error = request_any_context_irq(ponkey->irq_dbf, ab8500_ponkey_handler, 86 0, "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 goto err_free_mem; 91 } 92 93 error = request_any_context_irq(ponkey->irq_dbr, ab8500_ponkey_handler, 94 0, "ab8500-ponkey-dbr", ponkey); 95 if (error < 0) { 96 dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n", 97 ponkey->irq_dbr, error); 98 goto err_free_dbf_irq; 99 } 100 101 error = input_register_device(ponkey->idev); 102 if (error) { 103 dev_err(ab8500->dev, "Can't register input device: %d\n", error); 104 goto err_free_dbr_irq; 105 } 106 107 platform_set_drvdata(pdev, ponkey); 108 return 0; 109 110 err_free_dbr_irq: 111 free_irq(ponkey->irq_dbr, ponkey); 112 err_free_dbf_irq: 113 free_irq(ponkey->irq_dbf, ponkey); 114 err_free_mem: 115 input_free_device(input); 116 kfree(ponkey); 117 118 return error; 119 } 120 121 static int ab8500_ponkey_remove(struct platform_device *pdev) 122 { 123 struct ab8500_ponkey *ponkey = platform_get_drvdata(pdev); 124 125 free_irq(ponkey->irq_dbf, ponkey); 126 free_irq(ponkey->irq_dbr, ponkey); 127 input_unregister_device(ponkey->idev); 128 kfree(ponkey); 129 130 return 0; 131 } 132 133 #ifdef CONFIG_OF 134 static const struct of_device_id ab8500_ponkey_match[] = { 135 { .compatible = "stericsson,ab8500-ponkey", }, 136 {} 137 }; 138 #endif 139 140 static struct platform_driver ab8500_ponkey_driver = { 141 .driver = { 142 .name = "ab8500-poweron-key", 143 .owner = THIS_MODULE, 144 .of_match_table = of_match_ptr(ab8500_ponkey_match), 145 }, 146 .probe = ab8500_ponkey_probe, 147 .remove = ab8500_ponkey_remove, 148 }; 149 module_platform_driver(ab8500_ponkey_driver); 150 151 MODULE_LICENSE("GPL v2"); 152 MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); 153 MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver"); 154