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 43 guard(spinlock_irqsave)(&q40kbd->lock); 44 45 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) 46 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0); 47 48 master_outb(-1, KEYBOARD_UNLOCK_REG); 49 50 return IRQ_HANDLED; 51 } 52 53 /* 54 * q40kbd_flush() flushes all data that may be in the keyboard buffers 55 */ 56 57 static void q40kbd_flush(struct q40kbd *q40kbd) 58 { 59 int maxread = 100; 60 61 guard(spinlock_irqsave)(&q40kbd->lock); 62 63 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) 64 master_inb(KEYCODE_REG); 65 } 66 67 static void q40kbd_stop(void) 68 { 69 master_outb(0, KEY_IRQ_ENABLE_REG); 70 master_outb(-1, KEYBOARD_UNLOCK_REG); 71 } 72 73 /* 74 * q40kbd_open() is called when a port is open by the higher layer. 75 * It allocates the interrupt and enables in in the chip. 76 */ 77 78 static int q40kbd_open(struct serio *port) 79 { 80 struct q40kbd *q40kbd = port->port_data; 81 82 q40kbd_flush(q40kbd); 83 84 /* off we go */ 85 master_outb(-1, KEYBOARD_UNLOCK_REG); 86 master_outb(1, KEY_IRQ_ENABLE_REG); 87 88 return 0; 89 } 90 91 static void q40kbd_close(struct serio *port) 92 { 93 struct q40kbd *q40kbd = port->port_data; 94 95 q40kbd_stop(); 96 q40kbd_flush(q40kbd); 97 } 98 99 static int q40kbd_probe(struct platform_device *pdev) 100 { 101 struct q40kbd *q40kbd; 102 struct serio *port; 103 int error; 104 105 q40kbd = kzalloc(sizeof(*q40kbd), GFP_KERNEL); 106 port = kzalloc(sizeof(*port), GFP_KERNEL); 107 if (!q40kbd || !port) { 108 error = -ENOMEM; 109 goto err_free_mem; 110 } 111 112 q40kbd->port = port; 113 spin_lock_init(&q40kbd->lock); 114 115 port->id.type = SERIO_8042; 116 port->open = q40kbd_open; 117 port->close = q40kbd_close; 118 port->port_data = q40kbd; 119 port->dev.parent = &pdev->dev; 120 strscpy(port->name, "Q40 Kbd Port", sizeof(port->name)); 121 strscpy(port->phys, "Q40", sizeof(port->phys)); 122 123 q40kbd_stop(); 124 125 error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, 126 DRV_NAME, q40kbd); 127 if (error) { 128 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD); 129 goto err_free_mem; 130 } 131 132 serio_register_port(q40kbd->port); 133 134 platform_set_drvdata(pdev, q40kbd); 135 printk(KERN_INFO "serio: Q40 kbd registered\n"); 136 137 return 0; 138 139 err_free_mem: 140 kfree(port); 141 kfree(q40kbd); 142 return error; 143 } 144 145 static void q40kbd_remove(struct platform_device *pdev) 146 { 147 struct q40kbd *q40kbd = platform_get_drvdata(pdev); 148 149 /* 150 * q40kbd_close() will be called as part of unregistering 151 * and will ensure that IRQ is turned off, so it is safe 152 * to unregister port first and free IRQ later. 153 */ 154 serio_unregister_port(q40kbd->port); 155 free_irq(Q40_IRQ_KEYBOARD, q40kbd); 156 kfree(q40kbd); 157 } 158 159 static struct platform_driver q40kbd_driver = { 160 .driver = { 161 .name = "q40kbd", 162 }, 163 .remove = q40kbd_remove, 164 }; 165 166 module_platform_driver_probe(q40kbd_driver, q40kbd_probe); 167