1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * OpenCores Keyboard Controller Driver 4 * http://www.opencores.org/project,keyboardcontroller 5 * 6 * Copyright 2007-2009 HV Sistemas S.L. 7 */ 8 9 #include <linux/input.h> 10 #include <linux/interrupt.h> 11 #include <linux/io.h> 12 #include <linux/ioport.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/slab.h> 17 18 struct opencores_kbd { 19 struct input_dev *input; 20 void __iomem *addr; 21 int irq; 22 unsigned short keycodes[128]; 23 }; 24 25 static irqreturn_t opencores_kbd_isr(int irq, void *dev_id) 26 { 27 struct opencores_kbd *opencores_kbd = dev_id; 28 struct input_dev *input = opencores_kbd->input; 29 unsigned char c; 30 31 c = readb(opencores_kbd->addr); 32 input_report_key(input, c & 0x7f, c & 0x80 ? 0 : 1); 33 input_sync(input); 34 35 return IRQ_HANDLED; 36 } 37 38 static int opencores_kbd_probe(struct platform_device *pdev) 39 { 40 struct input_dev *input; 41 struct opencores_kbd *opencores_kbd; 42 int irq, i, error; 43 44 irq = platform_get_irq(pdev, 0); 45 if (irq < 0) 46 return -EINVAL; 47 48 opencores_kbd = devm_kzalloc(&pdev->dev, sizeof(*opencores_kbd), 49 GFP_KERNEL); 50 if (!opencores_kbd) 51 return -ENOMEM; 52 53 input = devm_input_allocate_device(&pdev->dev); 54 if (!input) { 55 dev_err(&pdev->dev, "failed to allocate input device\n"); 56 return -ENOMEM; 57 } 58 59 opencores_kbd->input = input; 60 61 opencores_kbd->addr = devm_platform_ioremap_resource(pdev, 0); 62 if (IS_ERR(opencores_kbd->addr)) 63 return PTR_ERR(opencores_kbd->addr); 64 65 input->name = pdev->name; 66 input->phys = "opencores-kbd/input0"; 67 68 input->id.bustype = BUS_HOST; 69 input->id.vendor = 0x0001; 70 input->id.product = 0x0001; 71 input->id.version = 0x0100; 72 73 input->keycode = opencores_kbd->keycodes; 74 input->keycodesize = sizeof(opencores_kbd->keycodes[0]); 75 input->keycodemax = ARRAY_SIZE(opencores_kbd->keycodes); 76 77 __set_bit(EV_KEY, input->evbit); 78 79 for (i = 0; i < ARRAY_SIZE(opencores_kbd->keycodes); i++) { 80 /* 81 * OpenCores controller happens to have scancodes match 82 * our KEY_* definitions. 83 */ 84 opencores_kbd->keycodes[i] = i; 85 __set_bit(opencores_kbd->keycodes[i], input->keybit); 86 } 87 __clear_bit(KEY_RESERVED, input->keybit); 88 89 error = devm_request_irq(&pdev->dev, irq, &opencores_kbd_isr, 90 IRQF_TRIGGER_RISING, 91 pdev->name, opencores_kbd); 92 if (error) { 93 dev_err(&pdev->dev, "unable to claim irq %d\n", irq); 94 return error; 95 } 96 97 error = input_register_device(input); 98 if (error) { 99 dev_err(&pdev->dev, "unable to register input device\n"); 100 return error; 101 } 102 103 return 0; 104 } 105 106 static struct platform_driver opencores_kbd_device_driver = { 107 .probe = opencores_kbd_probe, 108 .driver = { 109 .name = "opencores-kbd", 110 }, 111 }; 112 module_platform_driver(opencores_kbd_device_driver); 113 114 MODULE_LICENSE("GPL"); 115 MODULE_AUTHOR("Javier Herrero <jherrero@hvsistemas.es>"); 116 MODULE_DESCRIPTION("Keyboard driver for OpenCores Keyboard Controller"); 117