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 /* 14 */ 15 16 #include <linux/module.h> 17 #include <linux/serio.h> 18 #include <linux/interrupt.h> 19 #include <linux/err.h> 20 #include <linux/bitops.h> 21 #include <linux/platform_device.h> 22 #include <linux/slab.h> 23 24 #include <asm/io.h> 25 #include <linux/uaccess.h> 26 #include <asm/q40_master.h> 27 #include <asm/irq.h> 28 #include <asm/q40ints.h> 29 30 #define DRV_NAME "q40kbd" 31 32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 33 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); 34 MODULE_LICENSE("GPL"); 35 MODULE_ALIAS("platform:" DRV_NAME); 36 37 struct q40kbd { 38 struct serio *port; 39 spinlock_t lock; 40 }; 41 42 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) 43 { 44 struct q40kbd *q40kbd = dev_id; 45 unsigned long flags; 46 47 spin_lock_irqsave(&q40kbd->lock, flags); 48 49 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) 50 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0); 51 52 master_outb(-1, KEYBOARD_UNLOCK_REG); 53 54 spin_unlock_irqrestore(&q40kbd->lock, flags); 55 56 return IRQ_HANDLED; 57 } 58 59 /* 60 * q40kbd_flush() flushes all data that may be in the keyboard buffers 61 */ 62 63 static void q40kbd_flush(struct q40kbd *q40kbd) 64 { 65 int maxread = 100; 66 unsigned long flags; 67 68 spin_lock_irqsave(&q40kbd->lock, flags); 69 70 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) 71 master_inb(KEYCODE_REG); 72 73 spin_unlock_irqrestore(&q40kbd->lock, flags); 74 } 75 76 static void q40kbd_stop(void) 77 { 78 master_outb(0, KEY_IRQ_ENABLE_REG); 79 master_outb(-1, KEYBOARD_UNLOCK_REG); 80 } 81 82 /* 83 * q40kbd_open() is called when a port is open by the higher layer. 84 * It allocates the interrupt and enables in in the chip. 85 */ 86 87 static int q40kbd_open(struct serio *port) 88 { 89 struct q40kbd *q40kbd = port->port_data; 90 91 q40kbd_flush(q40kbd); 92 93 /* off we go */ 94 master_outb(-1, KEYBOARD_UNLOCK_REG); 95 master_outb(1, KEY_IRQ_ENABLE_REG); 96 97 return 0; 98 } 99 100 static void q40kbd_close(struct serio *port) 101 { 102 struct q40kbd *q40kbd = port->port_data; 103 104 q40kbd_stop(); 105 q40kbd_flush(q40kbd); 106 } 107 108 static int q40kbd_probe(struct platform_device *pdev) 109 { 110 struct q40kbd *q40kbd; 111 struct serio *port; 112 int error; 113 114 q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL); 115 port = kzalloc(sizeof(struct serio), GFP_KERNEL); 116 if (!q40kbd || !port) { 117 error = -ENOMEM; 118 goto err_free_mem; 119 } 120 121 q40kbd->port = port; 122 spin_lock_init(&q40kbd->lock); 123 124 port->id.type = SERIO_8042; 125 port->open = q40kbd_open; 126 port->close = q40kbd_close; 127 port->port_data = q40kbd; 128 port->dev.parent = &pdev->dev; 129 strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name)); 130 strlcpy(port->phys, "Q40", sizeof(port->phys)); 131 132 q40kbd_stop(); 133 134 error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, 135 DRV_NAME, q40kbd); 136 if (error) { 137 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD); 138 goto err_free_mem; 139 } 140 141 serio_register_port(q40kbd->port); 142 143 platform_set_drvdata(pdev, q40kbd); 144 printk(KERN_INFO "serio: Q40 kbd registered\n"); 145 146 return 0; 147 148 err_free_mem: 149 kfree(port); 150 kfree(q40kbd); 151 return error; 152 } 153 154 static int q40kbd_remove(struct platform_device *pdev) 155 { 156 struct q40kbd *q40kbd = platform_get_drvdata(pdev); 157 158 /* 159 * q40kbd_close() will be called as part of unregistering 160 * and will ensure that IRQ is turned off, so it is safe 161 * to unregister port first and free IRQ later. 162 */ 163 serio_unregister_port(q40kbd->port); 164 free_irq(Q40_IRQ_KEYBOARD, q40kbd); 165 kfree(q40kbd); 166 167 return 0; 168 } 169 170 static struct platform_driver q40kbd_driver = { 171 .driver = { 172 .name = "q40kbd", 173 }, 174 .remove = q40kbd_remove, 175 }; 176 177 module_platform_driver_probe(q40kbd_driver, q40kbd_probe); 178