1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Input driver for PCAP events: 4 * * Power key 5 * * Headphone button 6 * 7 * Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/interrupt.h> 12 #include <linux/platform_device.h> 13 #include <linux/input.h> 14 #include <linux/mfd/ezx-pcap.h> 15 #include <linux/slab.h> 16 17 struct pcap_keys { 18 struct pcap_chip *pcap; 19 struct input_dev *input; 20 }; 21 22 /* PCAP2 interrupts us on keypress */ 23 static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys) 24 { 25 struct pcap_keys *pcap_keys = _pcap_keys; 26 int pirq = irq_to_pcap(pcap_keys->pcap, irq); 27 u32 pstat; 28 29 ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat); 30 pstat &= 1 << pirq; 31 32 switch (pirq) { 33 case PCAP_IRQ_ONOFF: 34 input_report_key(pcap_keys->input, KEY_POWER, !pstat); 35 break; 36 case PCAP_IRQ_MIC: 37 input_report_key(pcap_keys->input, KEY_HP, !pstat); 38 break; 39 } 40 41 input_sync(pcap_keys->input); 42 43 return IRQ_HANDLED; 44 } 45 46 static int pcap_keys_probe(struct platform_device *pdev) 47 { 48 int err = -ENOMEM; 49 struct pcap_keys *pcap_keys; 50 struct input_dev *input_dev; 51 52 pcap_keys = kmalloc(sizeof(*pcap_keys), GFP_KERNEL); 53 if (!pcap_keys) 54 return err; 55 56 pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent); 57 58 input_dev = input_allocate_device(); 59 if (!input_dev) 60 goto fail; 61 62 pcap_keys->input = input_dev; 63 64 platform_set_drvdata(pdev, pcap_keys); 65 input_dev->name = pdev->name; 66 input_dev->phys = "pcap-keys/input0"; 67 input_dev->id.bustype = BUS_HOST; 68 input_dev->dev.parent = &pdev->dev; 69 70 __set_bit(EV_KEY, input_dev->evbit); 71 __set_bit(KEY_POWER, input_dev->keybit); 72 __set_bit(KEY_HP, input_dev->keybit); 73 74 err = input_register_device(input_dev); 75 if (err) 76 goto fail_allocate; 77 78 err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), 79 pcap_keys_handler, 0, "Power key", pcap_keys); 80 if (err) 81 goto fail_register; 82 83 err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), 84 pcap_keys_handler, 0, "Headphone button", pcap_keys); 85 if (err) 86 goto fail_pwrkey; 87 88 return 0; 89 90 fail_pwrkey: 91 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys); 92 fail_register: 93 input_unregister_device(input_dev); 94 goto fail; 95 fail_allocate: 96 input_free_device(input_dev); 97 fail: 98 kfree(pcap_keys); 99 return err; 100 } 101 102 static void pcap_keys_remove(struct platform_device *pdev) 103 { 104 struct pcap_keys *pcap_keys = platform_get_drvdata(pdev); 105 106 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys); 107 free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys); 108 109 input_unregister_device(pcap_keys->input); 110 kfree(pcap_keys); 111 } 112 113 static struct platform_driver pcap_keys_device_driver = { 114 .probe = pcap_keys_probe, 115 .remove_new = pcap_keys_remove, 116 .driver = { 117 .name = "pcap-keys", 118 } 119 }; 120 module_platform_driver(pcap_keys_device_driver); 121 122 MODULE_DESCRIPTION("Motorola PCAP2 input events driver"); 123 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>"); 124 MODULE_LICENSE("GPL"); 125 MODULE_ALIAS("platform:pcap_keys"); 126