Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/input/misc/pcap_keys.c

  1 /*
  2  *  Input driver for PCAP events:
  3  *   * Power key
  4  *   * Headphone button
  5  *
  6  *  Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com>
  7  *
  8  *  This program is free software; you can redistribute it and/or modify
  9  *  it under the terms of the GNU General Public License version 2 as
 10  *  published by the Free Software Foundation.
 11  *
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/interrupt.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/input.h>
 18 #include <linux/mfd/ezx-pcap.h>
 19 #include <linux/slab.h>
 20 
 21 struct pcap_keys {
 22         struct pcap_chip *pcap;
 23         struct input_dev *input;
 24 };
 25 
 26 /* PCAP2 interrupts us on keypress */
 27 static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys)
 28 {
 29         struct pcap_keys *pcap_keys = _pcap_keys;
 30         int pirq = irq_to_pcap(pcap_keys->pcap, irq);
 31         u32 pstat;
 32 
 33         ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat);
 34         pstat &= 1 << pirq;
 35 
 36         switch (pirq) {
 37         case PCAP_IRQ_ONOFF:
 38                 input_report_key(pcap_keys->input, KEY_POWER, !pstat);
 39                 break;
 40         case PCAP_IRQ_MIC:
 41                 input_report_key(pcap_keys->input, KEY_HP, !pstat);
 42                 break;
 43         }
 44 
 45         input_sync(pcap_keys->input);
 46 
 47         return IRQ_HANDLED;
 48 }
 49 
 50 static int pcap_keys_probe(struct platform_device *pdev)
 51 {
 52         int err = -ENOMEM;
 53         struct pcap_keys *pcap_keys;
 54         struct input_dev *input_dev;
 55 
 56         pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL);
 57         if (!pcap_keys)
 58                 return err;
 59 
 60         pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent);
 61 
 62         input_dev = input_allocate_device();
 63         if (!input_dev)
 64                 goto fail;
 65 
 66         pcap_keys->input = input_dev;
 67 
 68         platform_set_drvdata(pdev, pcap_keys);
 69         input_dev->name = pdev->name;
 70         input_dev->phys = "pcap-keys/input0";
 71         input_dev->id.bustype = BUS_HOST;
 72         input_dev->dev.parent = &pdev->dev;
 73 
 74         __set_bit(EV_KEY, input_dev->evbit);
 75         __set_bit(KEY_POWER, input_dev->keybit);
 76         __set_bit(KEY_HP, input_dev->keybit);
 77 
 78         err = input_register_device(input_dev);
 79         if (err)
 80                 goto fail_allocate;
 81 
 82         err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF),
 83                         pcap_keys_handler, 0, "Power key", pcap_keys);
 84         if (err)
 85                 goto fail_register;
 86 
 87         err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC),
 88                         pcap_keys_handler, 0, "Headphone button", pcap_keys);
 89         if (err)
 90                 goto fail_pwrkey;
 91 
 92         return 0;
 93 
 94 fail_pwrkey:
 95         free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
 96 fail_register:
 97         input_unregister_device(input_dev);
 98         goto fail;
 99 fail_allocate:
100         input_free_device(input_dev);
101 fail:
102         kfree(pcap_keys);
103         return err;
104 }
105 
106 static int pcap_keys_remove(struct platform_device *pdev)
107 {
108         struct pcap_keys *pcap_keys = platform_get_drvdata(pdev);
109 
110         free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
111         free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys);
112 
113         input_unregister_device(pcap_keys->input);
114         kfree(pcap_keys);
115 
116         return 0;
117 }
118 
119 static struct platform_driver pcap_keys_device_driver = {
120         .probe          = pcap_keys_probe,
121         .remove         = pcap_keys_remove,
122         .driver         = {
123                 .name   = "pcap-keys",
124                 .owner  = THIS_MODULE,
125         }
126 };
127 module_platform_driver(pcap_keys_device_driver);
128 
129 MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
130 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
131 MODULE_LICENSE("GPL");
132 MODULE_ALIAS("platform:pcap_keys");
133 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us