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Linux/drivers/input/serio/q40kbd.c

  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 <asm/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                 .owner  = THIS_MODULE,
190         },
191         .remove         = q40kbd_remove,
192 };
193 
194 module_platform_driver_probe(q40kbd_driver, q40kbd_probe);
195 

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