drivers/input/misc/ab8500-ponkey.c

   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");