1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2000-2001 Vojtech Pavlik 4 * 5 * Based on the work of: 6 * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de> 7 */ 8 9 /* 10 * Q40 PS/2 keyboard controller driver for Linux/m68k 11 */ 12 13 #include <linux/module.h> 14 #include <linux/serio.h> 15 #include <linux/interrupt.h> 16 #include <linux/err.h> 17 #include <linux/bitops.h> 18 #include <linux/platform_device.h> 19 #include <linux/slab.h> 20 21 #include <asm/io.h> 22 #include <linux/uaccess.h> 23 #include <asm/q40_master.h> 24 #include <asm/irq.h> 25 #include <asm/q40ints.h> 26 27 #define DRV_NAME "q40kbd" 28 29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 30 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); 31 MODULE_LICENSE("GPL"); 32 MODULE_ALIAS("platform:" DRV_NAME); 33 34 struct q40kbd { 35 struct serio *port; 36 spinlock_t lock; 37 }; 38 39 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) 40 { 41 struct q40kbd *q40kbd = dev_id; 42 unsigned long flags; 43 44 spin_lock_irqsave(&q40kbd->lock, flags); 45 46 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) 47 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0); 48 49 master_outb(-1, KEYBOARD_UNLOCK_REG); 50 51 spin_unlock_irqrestore(&q40kbd->lock, flags); 52 53 return IRQ_HANDLED; 54 } 55 56 /* 57 * q40kbd_flush() flushes all data that may be in the keyboard buffers 58 */ 59 60 static void q40kbd_flush(struct q40kbd *q40kbd) 61 { 62 int maxread = 100; 63 unsigned long flags; 64 65 spin_lock_irqsave(&q40kbd->lock, flags); 66 67 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) 68 master_inb(KEYCODE_REG); 69 70 spin_unlock_irqrestore(&q40kbd->lock, flags); 71 } 72 73 static void q40kbd_stop(void) 74 { 75 master_outb(0, KEY_IRQ_ENABLE_REG); 76 master_outb(-1, KEYBOARD_UNLOCK_REG); 77 } 78 79 /* 80 * q40kbd_open() is called when a port is open by the higher layer. 81 * It allocates the interrupt and enables in in the chip. 82 */ 83 84 static int q40kbd_open(struct serio *port) 85 { 86 struct q40kbd *q40kbd = port->port_data; 87 88 q40kbd_flush(q40kbd); 89 90 /* off we go */ 91 master_outb(-1, KEYBOARD_UNLOCK_REG); 92 master_outb(1, KEY_IRQ_ENABLE_REG); 93 94 return 0; 95 } 96 97 static void q40kbd_close(struct serio *port) 98 { 99 struct q40kbd *q40kbd = port->port_data; 100 101 q40kbd_stop(); 102 q40kbd_flush(q40kbd); 103 } 104 105 static int q40kbd_probe(struct platform_device *pdev) 106 { 107 struct q40kbd *q40kbd; 108 struct serio *port; 109 int error; 110 111 q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL); 112 port = kzalloc(sizeof(struct serio), GFP_KERNEL); 113 if (!q40kbd || !port) { 114 error = -ENOMEM; 115 goto err_free_mem; 116 } 117 118 q40kbd->port = port; 119 spin_lock_init(&q40kbd->lock); 120 121 port->id.type = SERIO_8042; 122 port->open = q40kbd_open; 123 port->close = q40kbd_close; 124 port->port_data = q40kbd; 125 port->dev.parent = &pdev->dev; 126 strscpy(port->name, "Q40 Kbd Port", sizeof(port->name)); 127 strscpy(port->phys, "Q40", sizeof(port->phys)); 128 129 q40kbd_stop(); 130 131 error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, 132 DRV_NAME, q40kbd); 133 if (error) { 134 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD); 135 goto err_free_mem; 136 } 137 138 serio_register_port(q40kbd->port); 139 140 platform_set_drvdata(pdev, q40kbd); 141 printk(KERN_INFO "serio: Q40 kbd registered\n"); 142 143 return 0; 144 145 err_free_mem: 146 kfree(port); 147 kfree(q40kbd); 148 return error; 149 } 150 151 static int q40kbd_remove(struct platform_device *pdev) 152 { 153 struct q40kbd *q40kbd = platform_get_drvdata(pdev); 154 155 /* 156 * q40kbd_close() will be called as part of unregistering 157 * and will ensure that IRQ is turned off, so it is safe 158 * to unregister port first and free IRQ later. 159 */ 160 serio_unregister_port(q40kbd->port); 161 free_irq(Q40_IRQ_KEYBOARD, q40kbd); 162 kfree(q40kbd); 163 164 return 0; 165 } 166 167 static struct platform_driver q40kbd_driver = { 168 .driver = { 169 .name = "q40kbd", 170 }, 171 .remove = q40kbd_remove, 172 }; 173 174 module_platform_driver_probe(q40kbd_driver, q40kbd_probe); 175