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 * Should you need to contact me, the author, you can do so either by 28 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 29 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 30 */ 31 32 #include <linux/module.h> 33 #include <linux/init.h> 34 #include <linux/serio.h> 35 #include <linux/interrupt.h> 36 #include <linux/err.h> 37 #include <linux/bitops.h> 38 #include <linux/platform_device.h> 39 #include <linux/slab.h> 40 41 #include <asm/io.h> 42 #include <asm/uaccess.h> 43 #include <asm/q40_master.h> 44 #include <asm/irq.h> 45 #include <asm/q40ints.h> 46 47 #define DRV_NAME "q40kbd" 48 49 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 50 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); 51 MODULE_LICENSE("GPL"); 52 MODULE_ALIAS("platform:" DRV_NAME); 53 54 struct q40kbd { 55 struct serio *port; 56 spinlock_t lock; 57 }; 58 59 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) 60 { 61 struct q40kbd *q40kbd = dev_id; 62 unsigned long flags; 63 64 spin_lock_irqsave(&q40kbd->lock, flags); 65 66 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) 67 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0); 68 69 master_outb(-1, KEYBOARD_UNLOCK_REG); 70 71 spin_unlock_irqrestore(&q40kbd->lock, flags); 72 73 return IRQ_HANDLED; 74 } 75 76 /* 77 * q40kbd_flush() flushes all data that may be in the keyboard buffers 78 */ 79 80 static void q40kbd_flush(struct q40kbd *q40kbd) 81 { 82 int maxread = 100; 83 unsigned long flags; 84 85 spin_lock_irqsave(&q40kbd->lock, flags); 86 87 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) 88 master_inb(KEYCODE_REG); 89 90 spin_unlock_irqrestore(&q40kbd->lock, flags); 91 } 92 93 static void q40kbd_stop(void) 94 { 95 master_outb(0, KEY_IRQ_ENABLE_REG); 96 master_outb(-1, KEYBOARD_UNLOCK_REG); 97 } 98 99 /* 100 * q40kbd_open() is called when a port is open by the higher layer. 101 * It allocates the interrupt and enables in in the chip. 102 */ 103 104 static int q40kbd_open(struct serio *port) 105 { 106 struct q40kbd *q40kbd = port->port_data; 107 108 q40kbd_flush(q40kbd); 109 110 /* off we go */ 111 master_outb(-1, KEYBOARD_UNLOCK_REG); 112 master_outb(1, KEY_IRQ_ENABLE_REG); 113 114 return 0; 115 } 116 117 static void q40kbd_close(struct serio *port) 118 { 119 struct q40kbd *q40kbd = port->port_data; 120 121 q40kbd_stop(); 122 q40kbd_flush(q40kbd); 123 } 124 125 static int q40kbd_probe(struct platform_device *pdev) 126 { 127 struct q40kbd *q40kbd; 128 struct serio *port; 129 int error; 130 131 q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL); 132 port = kzalloc(sizeof(struct serio), GFP_KERNEL); 133 if (!q40kbd || !port) { 134 error = -ENOMEM; 135 goto err_free_mem; 136 } 137 138 q40kbd->port = port; 139 spin_lock_init(&q40kbd->lock); 140 141 port->id.type = SERIO_8042; 142 port->open = q40kbd_open; 143 port->close = q40kbd_close; 144 port->port_data = q40kbd; 145 port->dev.parent = &pdev->dev; 146 strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name)); 147 strlcpy(port->phys, "Q40", sizeof(port->phys)); 148 149 q40kbd_stop(); 150 151 error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, 152 DRV_NAME, q40kbd); 153 if (error) { 154 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD); 155 goto err_free_mem; 156 } 157 158 serio_register_port(q40kbd->port); 159 160 platform_set_drvdata(pdev, q40kbd); 161 printk(KERN_INFO "serio: Q40 kbd registered\n"); 162 163 return 0; 164 165 err_free_mem: 166 kfree(port); 167 kfree(q40kbd); 168 return error; 169 } 170 171 static int q40kbd_remove(struct platform_device *pdev) 172 { 173 struct q40kbd *q40kbd = platform_get_drvdata(pdev); 174 175 /* 176 * q40kbd_close() will be called as part of unregistering 177 * and will ensure that IRQ is turned off, so it is safe 178 * to unregister port first and free IRQ later. 179 */ 180 serio_unregister_port(q40kbd->port); 181 free_irq(Q40_IRQ_KEYBOARD, q40kbd); 182 kfree(q40kbd); 183 184 platform_set_drvdata(pdev, NULL); 185 return 0; 186 } 187 188 static struct platform_driver q40kbd_driver = { 189 .driver = { 190 .name = "q40kbd", 191 .owner = THIS_MODULE, 192 }, 193 .remove = q40kbd_remove, 194 }; 195 196 static int __init q40kbd_init(void) 197 { 198 return platform_driver_probe(&q40kbd_driver, q40kbd_probe); 199 } 200 201 static void __exit q40kbd_exit(void) 202 { 203 platform_driver_unregister(&q40kbd_driver); 204 } 205 206 module_init(q40kbd_init); 207 module_exit(q40kbd_exit); 208