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 }, 172 }; 173 module_platform_driver(rpckbd_driver); 174