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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/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 

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