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Linux/drivers/input/serio/rpckbd.c

  1 /*
  2  *  Copyright (c) 2000-2001 Vojtech Pavlik
  3  *  Copyright (c) 2002 Russell King
  4  */
  5 
  6 /*
  7  * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
  8  */
  9 
 10 /*
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License as published by
 13  * the Free Software Foundation; either version 2 of the License, or
 14  * (at your option) any later version.
 15  *
 16  * This program is distributed in the hope that it will be useful,
 17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 19  * GNU General Public License for more details.
 20  *
 21  * You should have received a copy of the GNU General Public License
 22  * along with this program; if not, write to the Free Software
 23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 24  *
 25  * Should you need to contact me, the author, you can do so either by
 26  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 27  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 28  */
 29 
 30 #include <linux/module.h>
 31 #include <linux/interrupt.h>
 32 #include <linux/serio.h>
 33 #include <linux/err.h>
 34 #include <linux/platform_device.h>
 35 #include <linux/io.h>
 36 #include <linux/slab.h>
 37 
 38 #include <mach/hardware.h>
 39 #include <asm/hardware/iomd.h>
 40 
 41 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
 42 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
 43 MODULE_LICENSE("GPL");
 44 MODULE_ALIAS("platform:kart");
 45 
 46 struct rpckbd_data {
 47         int tx_irq;
 48         int rx_irq;
 49 };
 50 
 51 static int rpckbd_write(struct serio *port, unsigned char val)
 52 {
 53         while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
 54                 cpu_relax();
 55 
 56         iomd_writeb(val, IOMD_KARTTX);
 57 
 58         return 0;
 59 }
 60 
 61 static irqreturn_t rpckbd_rx(int irq, void *dev_id)
 62 {
 63         struct serio *port = dev_id;
 64         unsigned int byte;
 65         int handled = IRQ_NONE;
 66 
 67         while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
 68                 byte = iomd_readb(IOMD_KARTRX);
 69 
 70                 serio_interrupt(port, byte, 0);
 71                 handled = IRQ_HANDLED;
 72         }
 73         return handled;
 74 }
 75 
 76 static irqreturn_t rpckbd_tx(int irq, void *dev_id)
 77 {
 78         return IRQ_HANDLED;
 79 }
 80 
 81 static int rpckbd_open(struct serio *port)
 82 {
 83         struct rpckbd_data *rpckbd = port->port_data;
 84 
 85         /* Reset the keyboard state machine. */
 86         iomd_writeb(0, IOMD_KCTRL);
 87         iomd_writeb(8, IOMD_KCTRL);
 88         iomd_readb(IOMD_KARTRX);
 89 
 90         if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
 91                 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
 92                 return -EBUSY;
 93         }
 94 
 95         if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
 96                 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
 97                 free_irq(rpckbd->rx_irq, port);
 98                 return -EBUSY;
 99         }
100 
101         return 0;
102 }
103 
104 static void rpckbd_close(struct serio *port)
105 {
106         struct rpckbd_data *rpckbd = port->port_data;
107 
108         free_irq(rpckbd->rx_irq, port);
109         free_irq(rpckbd->tx_irq, port);
110 }
111 
112 /*
113  * Allocate and initialize serio structure for subsequent registration
114  * with serio core.
115  */
116 static int rpckbd_probe(struct platform_device *dev)
117 {
118         struct rpckbd_data *rpckbd;
119         struct serio *serio;
120         int tx_irq, rx_irq;
121 
122         rx_irq = platform_get_irq(dev, 0);
123         if (rx_irq <= 0)
124                 return rx_irq < 0 ? rx_irq : -ENXIO;
125 
126         tx_irq = platform_get_irq(dev, 1);
127         if (tx_irq <= 0)
128                 return tx_irq < 0 ? tx_irq : -ENXIO;
129 
130         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
131         rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
132         if (!serio || !rpckbd) {
133                 kfree(rpckbd);
134                 kfree(serio);
135                 return -ENOMEM;
136         }
137 
138         rpckbd->rx_irq = rx_irq;
139         rpckbd->tx_irq = tx_irq;
140 
141         serio->id.type          = SERIO_8042;
142         serio->write            = rpckbd_write;
143         serio->open             = rpckbd_open;
144         serio->close            = rpckbd_close;
145         serio->dev.parent       = &dev->dev;
146         serio->port_data        = rpckbd;
147         strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
148         strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
149 
150         platform_set_drvdata(dev, serio);
151         serio_register_port(serio);
152         return 0;
153 }
154 
155 static int rpckbd_remove(struct platform_device *dev)
156 {
157         struct serio *serio = platform_get_drvdata(dev);
158         struct rpckbd_data *rpckbd = serio->port_data;
159 
160         serio_unregister_port(serio);
161         kfree(rpckbd);
162 
163         return 0;
164 }
165 
166 static struct platform_driver rpckbd_driver = {
167         .probe          = rpckbd_probe,
168         .remove         = rpckbd_remove,
169         .driver         = {
170                 .name   = "kart",
171                 .owner  = THIS_MODULE,
172         },
173 };
174 module_platform_driver(rpckbd_driver);
175 

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