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/init.h> 33 #include <linux/serio.h> 34 #include <linux/err.h> 35 #include <linux/platform_device.h> 36 #include <linux/io.h> 37 #include <linux/slab.h> 38 39 #include <mach/hardware.h> 40 #include <asm/hardware/iomd.h> 41 42 MODULE_AUTHOR("Vojtech Pavlik, Russell King"); 43 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver"); 44 MODULE_LICENSE("GPL"); 45 MODULE_ALIAS("platform:kart"); 46 47 struct rpckbd_data { 48 int tx_irq; 49 int rx_irq; 50 }; 51 52 static int rpckbd_write(struct serio *port, unsigned char val) 53 { 54 while (!(iomd_readb(IOMD_KCTRL) & (1 << 7))) 55 cpu_relax(); 56 57 iomd_writeb(val, IOMD_KARTTX); 58 59 return 0; 60 } 61 62 static irqreturn_t rpckbd_rx(int irq, void *dev_id) 63 { 64 struct serio *port = dev_id; 65 unsigned int byte; 66 int handled = IRQ_NONE; 67 68 while (iomd_readb(IOMD_KCTRL) & (1 << 5)) { 69 byte = iomd_readb(IOMD_KARTRX); 70 71 serio_interrupt(port, byte, 0); 72 handled = IRQ_HANDLED; 73 } 74 return handled; 75 } 76 77 static irqreturn_t rpckbd_tx(int irq, void *dev_id) 78 { 79 return IRQ_HANDLED; 80 } 81 82 static int rpckbd_open(struct serio *port) 83 { 84 struct rpckbd_data *rpckbd = port->port_data; 85 86 /* Reset the keyboard state machine. */ 87 iomd_writeb(0, IOMD_KCTRL); 88 iomd_writeb(8, IOMD_KCTRL); 89 iomd_readb(IOMD_KARTRX); 90 91 if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) { 92 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n"); 93 return -EBUSY; 94 } 95 96 if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) { 97 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n"); 98 free_irq(rpckbd->rx_irq, port); 99 return -EBUSY; 100 } 101 102 return 0; 103 } 104 105 static void rpckbd_close(struct serio *port) 106 { 107 struct rpckbd_data *rpckbd = port->port_data; 108 109 free_irq(rpckbd->rx_irq, port); 110 free_irq(rpckbd->tx_irq, port); 111 } 112 113 /* 114 * Allocate and initialize serio structure for subsequent registration 115 * with serio core. 116 */ 117 static int __devinit rpckbd_probe(struct platform_device *dev) 118 { 119 struct rpckbd_data *rpckbd; 120 struct serio *serio; 121 int tx_irq, rx_irq; 122 123 rx_irq = platform_get_irq(dev, 0); 124 if (rx_irq <= 0) 125 return rx_irq < 0 ? rx_irq : -ENXIO; 126 127 tx_irq = platform_get_irq(dev, 1); 128 if (tx_irq <= 0) 129 return tx_irq < 0 ? tx_irq : -ENXIO; 130 131 serio = kzalloc(sizeof(struct serio), GFP_KERNEL); 132 rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL); 133 if (!serio || !rpckbd) { 134 kfree(rpckbd); 135 kfree(serio); 136 return -ENOMEM; 137 } 138 139 rpckbd->rx_irq = rx_irq; 140 rpckbd->tx_irq = tx_irq; 141 142 serio->id.type = SERIO_8042; 143 serio->write = rpckbd_write; 144 serio->open = rpckbd_open; 145 serio->close = rpckbd_close; 146 serio->dev.parent = &dev->dev; 147 serio->port_data = rpckbd; 148 strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name)); 149 strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys)); 150 151 platform_set_drvdata(dev, serio); 152 serio_register_port(serio); 153 return 0; 154 } 155 156 static int __devexit rpckbd_remove(struct platform_device *dev) 157 { 158 struct serio *serio = platform_get_drvdata(dev); 159 struct rpckbd_data *rpckbd = serio->port_data; 160 161 serio_unregister_port(serio); 162 kfree(rpckbd); 163 164 return 0; 165 } 166 167 static struct platform_driver rpckbd_driver = { 168 .probe = rpckbd_probe, 169 .remove = __devexit_p(rpckbd_remove), 170 .driver = { 171 .name = "kart", 172 .owner = THIS_MODULE, 173 }, 174 }; 175 module_platform_driver(rpckbd_driver); 176