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/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/platform_device.h> 18 #include <linux/input.h> 19 #include <linux/mfd/ezx-pcap.h> 20 #include <linux/slab.h> 21 22 struct pcap_keys { 23 struct pcap_chip *pcap; 24 struct input_dev *input; 25 }; 26 27 /* PCAP2 interrupts us on keypress */ 28 static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys) 29 { 30 struct pcap_keys *pcap_keys = _pcap_keys; 31 int pirq = irq_to_pcap(pcap_keys->pcap, irq); 32 u32 pstat; 33 34 ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat); 35 pstat &= 1 << pirq; 36 37 switch (pirq) { 38 case PCAP_IRQ_ONOFF: 39 input_report_key(pcap_keys->input, KEY_POWER, !pstat); 40 break; 41 case PCAP_IRQ_MIC: 42 input_report_key(pcap_keys->input, KEY_HP, !pstat); 43 break; 44 } 45 46 input_sync(pcap_keys->input); 47 48 return IRQ_HANDLED; 49 } 50 51 static int __devinit pcap_keys_probe(struct platform_device *pdev) 52 { 53 int err = -ENOMEM; 54 struct pcap_keys *pcap_keys; 55 struct input_dev *input_dev; 56 57 pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL); 58 if (!pcap_keys) 59 return err; 60 61 pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent); 62 63 input_dev = input_allocate_device(); 64 if (!input_dev) 65 goto fail; 66 67 pcap_keys->input = input_dev; 68 69 platform_set_drvdata(pdev, pcap_keys); 70 input_dev->name = pdev->name; 71 input_dev->phys = "pcap-keys/input0"; 72 input_dev->id.bustype = BUS_HOST; 73 input_dev->dev.parent = &pdev->dev; 74 75 __set_bit(EV_KEY, input_dev->evbit); 76 __set_bit(KEY_POWER, input_dev->keybit); 77 __set_bit(KEY_HP, input_dev->keybit); 78 79 err = input_register_device(input_dev); 80 if (err) 81 goto fail_allocate; 82 83 err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), 84 pcap_keys_handler, 0, "Power key", pcap_keys); 85 if (err) 86 goto fail_register; 87 88 err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), 89 pcap_keys_handler, 0, "Headphone button", pcap_keys); 90 if (err) 91 goto fail_pwrkey; 92 93 return 0; 94 95 fail_pwrkey: 96 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys); 97 fail_register: 98 input_unregister_device(input_dev); 99 goto fail; 100 fail_allocate: 101 input_free_device(input_dev); 102 fail: 103 kfree(pcap_keys); 104 return err; 105 } 106 107 static int __devexit pcap_keys_remove(struct platform_device *pdev) 108 { 109 struct pcap_keys *pcap_keys = platform_get_drvdata(pdev); 110 111 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys); 112 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys); 113 114 input_unregister_device(pcap_keys->input); 115 kfree(pcap_keys); 116 117 return 0; 118 } 119 120 static struct platform_driver pcap_keys_device_driver = { 121 .probe = pcap_keys_probe, 122 .remove = __devexit_p(pcap_keys_remove), 123 .driver = { 124 .name = "pcap-keys", 125 .owner = THIS_MODULE, 126 } 127 }; 128 module_platform_driver(pcap_keys_device_driver); 129 130 MODULE_DESCRIPTION("Motorola PCAP2 input events driver"); 131 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>"); 132 MODULE_LICENSE("GPL"); 133 MODULE_ALIAS("platform:pcap_keys"); 134