1 /* 2 * OpenCores Keyboard Controller Driver 3 * http://www.opencores.org/project,keyboardcontroller 4 * 5 * Copyright 2007-2009 HV Sistemas S.L. 6 * 7 * Licensed under the GPL-2 or later. 8 */ 9 10 #include <linux/input.h> 11 #include <linux/interrupt.h> 12 #include <linux/io.h> 13 #include <linux/ioport.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 #include <linux/slab.h> 18 19 struct opencores_kbd { 20 struct input_dev *input; 21 void __iomem *addr; 22 int irq; 23 unsigned short keycodes[128]; 24 }; 25 26 static irqreturn_t opencores_kbd_isr(int irq, void *dev_id) 27 { 28 struct opencores_kbd *opencores_kbd = dev_id; 29 struct input_dev *input = opencores_kbd->input; 30 unsigned char c; 31 32 c = readb(opencores_kbd->addr); 33 input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1); 34 input_sync(input); 35 36 return IRQ_HANDLED; 37 } 38 39 static int opencores_kbd_probe(struct platform_device *pdev) 40 { 41 struct input_dev *input; 42 struct opencores_kbd *opencores_kbd; 43 struct resource *res; 44 int irq, i, error; 45 46 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 47 if (!res) { 48 dev_err(&pdev->dev, "missing board memory resource\n"); 49 return -EINVAL; 50 } 51 52 irq = platform_get_irq(pdev, 0); 53 if (irq < 0) { 54 dev_err(&pdev->dev, "missing board IRQ resource\n"); 55 return -EINVAL; 56 } 57 58 opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd), 59 GFP_KERNEL); 60 if (!opencores_kbd) 61 return -ENOMEM; 62 63 input = devm_input_allocate_device(&pdev->dev); 64 if (!input) { 65 dev_err(&pdev->dev, "failed to allocate input device\n"); 66 return -ENOMEM; 67 } 68 69 opencores_kbd->input = input; 70 71 opencores_kbd->addr = devm_ioremap_resource(&pdev->dev, res); 72 if (IS_ERR(opencores_kbd->addr)) 73 return PTR_ERR(opencores_kbd->addr); 74 75 input->name = pdev->name; 76 input->phys = "opencores-kbd/input0"; 77 78 input_set_drvdata(input, opencores_kbd); 79 80 input->id.bustype = BUS_HOST; 81 input->id.vendor = 0x0001; 82 input->id.product = 0x0001; 83 input->id.version = 0x0100; 84 85 input->keycode = opencores_kbd->keycodes; 86 input->keycodesize = sizeof(opencores_kbd->keycodes[0]); 87 input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes); 88 89 __set_bit(EV_KEY, input->evbit); 90 91 for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) { 92 /* 93 * OpenCores controller happens to have scancodes match 94 * our KEY_* definitions. 95 */ 96 opencores_kbd->keycodes[i] = i; 97 __set_bit(opencores_kbd->keycodes[i], input->keybit); 98 } 99 __clear_bit(KEY_RESERVED, input->keybit); 100 101 error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr, 102 IRQF_TRIGGER_RISING, 103 pdev->name, opencores_kbd); 104 if (error) { 105 dev_err(&pdev->dev, "unable to claim irq %d\n", irq); 106 return error; 107 } 108 109 error = input_register_device(input); 110 if (error) { 111 dev_err(&pdev->dev, "unable to register input device\n"); 112 return error; 113 } 114 115 platform_set_drvdata(pdev, opencores_kbd); 116 117 return 0; 118 } 119 120 static struct platform_driver opencores_kbd_device_driver = { 121 .probe = opencores_kbd_probe, 122 .driver = { 123 .name = "opencores-kbd", 124 }, 125 }; 126 module_platform_driver(opencores_kbd_device_driver); 127 128 MODULE_LICENSE("GPL"); 129 MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>"); 130 MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller"); 131