1 /* NXP PCF50633 Input Driver 2 * 3 * (C) 2006-2008 by Openmoko, Inc. 4 * Author: Balaji Rao <balajirrao@openmoko.org> 5 * All rights reserved. 6 * 7 * Broken down from monstrous PCF50633 driver mainly by 8 * Harald Welte, Andy Green and Werner Almesberger 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the 12 * Free Software Foundation; either version 2 of the License, or (at your 13 * option) any later version. 14 * 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/device.h> 20 #include <linux/platform_device.h> 21 #include <linux/input.h> 22 #include <linux/slab.h> 23 24 #include <linux/mfd/pcf50633/core.h> 25 26 #define PCF50633_OOCSTAT_ONKEY 0x01 27 #define PCF50633_REG_OOCSTAT 0x12 28 #define PCF50633_REG_OOCMODE 0x10 29 30 struct pcf50633_input { 31 struct pcf50633 *pcf; 32 struct input_dev *input_dev; 33 }; 34 35 static void 36 pcf50633_input_irq(int irq, void *data) 37 { 38 struct pcf50633_input *input; 39 int onkey_released; 40 41 input = data; 42 43 /* We report only one event depending on the key press status */ 44 onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT) 45 & PCF50633_OOCSTAT_ONKEY; 46 47 if (irq == PCF50633_IRQ_ONKEYF && !onkey_released) 48 input_report_key(input->input_dev, KEY_POWER, 1); 49 else if (irq == PCF50633_IRQ_ONKEYR && onkey_released) 50 input_report_key(input->input_dev, KEY_POWER, 0); 51 52 input_sync(input->input_dev); 53 } 54 55 static int pcf50633_input_probe(struct platform_device *pdev) 56 { 57 struct pcf50633_input *input; 58 struct input_dev *input_dev; 59 int ret; 60 61 62 input = kzalloc(sizeof(*input), GFP_KERNEL); 63 if (!input) 64 return -ENOMEM; 65 66 input_dev = input_allocate_device(); 67 if (!input_dev) { 68 kfree(input); 69 return -ENOMEM; 70 } 71 72 platform_set_drvdata(pdev, input); 73 input->pcf = dev_to_pcf50633(pdev->dev.parent); 74 input->input_dev = input_dev; 75 76 input_dev->name = "PCF50633 PMU events"; 77 input_dev->id.bustype = BUS_I2C; 78 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR); 79 set_bit(KEY_POWER, input_dev->keybit); 80 81 ret = input_register_device(input_dev); 82 if (ret) { 83 input_free_device(input_dev); 84 kfree(input); 85 return ret; 86 } 87 pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR, 88 pcf50633_input_irq, input); 89 pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF, 90 pcf50633_input_irq, input); 91 92 return 0; 93 } 94 95 static int pcf50633_input_remove(struct platform_device *pdev) 96 { 97 struct pcf50633_input *input = platform_get_drvdata(pdev); 98 99 pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR); 100 pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF); 101 102 input_unregister_device(input->input_dev); 103 kfree(input); 104 105 return 0; 106 } 107 108 static struct platform_driver pcf50633_input_driver = { 109 .driver = { 110 .name = "pcf50633-input", 111 }, 112 .probe = pcf50633_input_probe, 113 .remove = pcf50633_input_remove, 114 }; 115 module_platform_driver(pcf50633_input_driver); 116 117 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>"); 118 MODULE_DESCRIPTION("PCF50633 input driver"); 119 MODULE_LICENSE("GPL"); 120 MODULE_ALIAS("platform:pcf50633-input"); 121