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Linux/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/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 #endif
122 
123 static struct platform_driver ab8500_ponkey_driver = {
124         .driver         = {
125                 .name   = "ab8500-poweron-key",
126                 .owner  = THIS_MODULE,
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 

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