1 /* 2 * Copyright (c) 2000-2001 Vojtech Pavlik 3 * 4 * Based on the work of: 5 * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de> 6 */ 7 8 /* 9 * Q40 PS/2 keyboard controller driver for Linux/m68k 10 */ 11 12 /* 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 26 */ 27 28 #include <linux/module.h> 29 #include <linux/serio.h> 30 #include <linux/interrupt.h> 31 #include <linux/err.h> 32 #include <linux/bitops.h> 33 #include <linux/platform_device.h> 34 #include <linux/slab.h> 35 36 #include <asm/io.h> 37 #include <linux/uaccess.h> 38 #include <asm/q40_master.h> 39 #include <asm/irq.h> 40 #include <asm/q40ints.h> 41 42 #define DRV_NAME "q40kbd" 43 44 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 45 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); 46 MODULE_LICENSE("GPL"); 47 MODULE_ALIAS("platform:" DRV_NAME); 48 49 struct q40kbd { 50 struct serio *port; 51 spinlock_t lock; 52 }; 53 54 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) 55 { 56 struct q40kbd *q40kbd = dev_id; 57 unsigned long flags; 58 59 spin_lock_irqsave(&q40kbd->lock, flags); 60 61 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) 62 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0); 63 64 master_outb(-1, KEYBOARD_UNLOCK_REG); 65 66 spin_unlock_irqrestore(&q40kbd->lock, flags); 67 68 return IRQ_HANDLED; 69 } 70 71 /* 72 * q40kbd_flush() flushes all data that may be in the keyboard buffers 73 */ 74 75 static void q40kbd_flush(struct q40kbd *q40kbd) 76 { 77 int maxread = 100; 78 unsigned long flags; 79 80 spin_lock_irqsave(&q40kbd->lock, flags); 81 82 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) 83 master_inb(KEYCODE_REG); 84 85 spin_unlock_irqrestore(&q40kbd->lock, flags); 86 } 87 88 static void q40kbd_stop(void) 89 { 90 master_outb(0, KEY_IRQ_ENABLE_REG); 91 master_outb(-1, KEYBOARD_UNLOCK_REG); 92 } 93 94 /* 95 * q40kbd_open() is called when a port is open by the higher layer. 96 * It allocates the interrupt and enables in in the chip. 97 */ 98 99 static int q40kbd_open(struct serio *port) 100 { 101 struct q40kbd *q40kbd = port->port_data; 102 103 q40kbd_flush(q40kbd); 104 105 /* off we go */ 106 master_outb(-1, KEYBOARD_UNLOCK_REG); 107 master_outb(1, KEY_IRQ_ENABLE_REG); 108 109 return 0; 110 } 111 112 static void q40kbd_close(struct serio *port) 113 { 114 struct q40kbd *q40kbd = port->port_data; 115 116 q40kbd_stop(); 117 q40kbd_flush(q40kbd); 118 } 119 120 static int q40kbd_probe(struct platform_device *pdev) 121 { 122 struct q40kbd *q40kbd; 123 struct serio *port; 124 int error; 125 126 q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL); 127 port = kzalloc(sizeof(struct serio), GFP_KERNEL); 128 if (!q40kbd || !port) { 129 error = -ENOMEM; 130 goto err_free_mem; 131 } 132 133 q40kbd->port = port; 134 spin_lock_init(&q40kbd->lock); 135 136 port->id.type = SERIO_8042; 137 port->open = q40kbd_open; 138 port->close = q40kbd_close; 139 port->port_data = q40kbd; 140 port->dev.parent = &pdev->dev; 141 strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name)); 142 strlcpy(port->phys, "Q40", sizeof(port->phys)); 143 144 q40kbd_stop(); 145 146 error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, 147 DRV_NAME, q40kbd); 148 if (error) { 149 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD); 150 goto err_free_mem; 151 } 152 153 serio_register_port(q40kbd->port); 154 155 platform_set_drvdata(pdev, q40kbd); 156 printk(KERN_INFO "serio: Q40 kbd registered\n"); 157 158 return 0; 159 160 err_free_mem: 161 kfree(port); 162 kfree(q40kbd); 163 return error; 164 } 165 166 static int q40kbd_remove(struct platform_device *pdev) 167 { 168 struct q40kbd *q40kbd = platform_get_drvdata(pdev); 169 170 /* 171 * q40kbd_close() will be called as part of unregistering 172 * and will ensure that IRQ is turned off, so it is safe 173 * to unregister port first and free IRQ later. 174 */ 175 serio_unregister_port(q40kbd->port); 176 free_irq(Q40_IRQ_KEYBOARD, q40kbd); 177 kfree(q40kbd); 178 179 return 0; 180 } 181 182 static struct platform_driver q40kbd_driver = { 183 .driver = { 184 .name = "q40kbd", 185 }, 186 .remove = q40kbd_remove, 187 }; 188 189 module_platform_driver_probe(q40kbd_driver, q40kbd_probe); 190