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