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