drivers/input/serio/maceps2.c

   1 /*
   2  * SGI O2 MACE PS2 controller driver for linux
   3  *
   4  * Copyright (C) 2002 Vivien Chappelier
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation
   9  */
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/serio.h>
  13 #include <linux/errno.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/ioport.h>
  16 #include <linux/delay.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/slab.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/err.h>
  21
  22 #include <asm/io.h>
  23 #include <asm/irq.h>
  24 #include <asm/system.h>
  25 #include <asm/ip32/mace.h>
  26 #include <asm/ip32/ip32_ints.h>
  27
  28 MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org");
  29 MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver");
  30 MODULE_LICENSE("GPL");
  31
  32 #define MACE_PS2_TIMEOUT 10000 /* in 50us unit */
  33
  34 #define PS2_STATUS_CLOCK_SIGNAL  BIT(0) /* external clock signal */
  35 #define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */
  36 #define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */
  37 #define PS2_STATUS_TX_EMPTY      BIT(3) /* empty transmit buffer */
  38 #define PS2_STATUS_RX_FULL       BIT(4) /* full receive buffer */
  39 #define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */
  40 #define PS2_STATUS_ERROR_PARITY  BIT(6) /* parity error */
  41 #define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */
  42
  43 #define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */
  44 #define PS2_CONTROL_TX_ENABLE        BIT(1) /* transmit enable */
  45 #define PS2_CONTROL_TX_INT_ENABLE    BIT(2) /* enable transmit interrupt */
  46 #define PS2_CONTROL_RX_INT_ENABLE    BIT(3) /* enable receive interrupt */
  47 #define PS2_CONTROL_RX_CLOCK_ENABLE  BIT(4) /* pause reception if set to 0 */
  48 #define PS2_CONTROL_RESET            BIT(5) /* reset */
  49
  50 struct maceps2_data {
  51         struct mace_ps2port *port;
  52         int irq;
  53 };
  54
  55 static struct maceps2_data port_data[2];
  56 static struct serio *maceps2_port[2];
  57 static struct platform_device *maceps2_device;
  58
  59 static int maceps2_write(struct serio *dev, unsigned char val)
  60 {
  61         struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
  62         unsigned int timeout = MACE_PS2_TIMEOUT;
  63
  64         do {
  65                 if (port->status & PS2_STATUS_TX_EMPTY) {
  66                         port->tx = val;
  67                         return 0;
  68                 }
  69                 udelay(50);
  70         } while (timeout--);
  71
  72         return -1;
  73 }
  74
  75 static irqreturn_t maceps2_interrupt(int irq, void *dev_id)
  76 {
  77         struct serio *dev = dev_id;
  78         struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
  79         unsigned long byte;
  80
  81         if (port->status & PS2_STATUS_RX_FULL) {
  82                 byte = port->rx;
  83                 serio_interrupt(dev, byte & 0xff, 0);
  84         }
  85
  86         return IRQ_HANDLED;
  87 }
  88
  89 static int maceps2_open(struct serio *dev)
  90 {
  91         struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
  92
  93         if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) {
  94                 printk(KERN_ERR "Could not allocate PS/2 IRQ\n");
  95                 return -EBUSY;
  96         }
  97
  98         /* Reset port */
  99         data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
 100         udelay(100);
 101
 102         /* Enable interrupts */
 103         data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE |
 104                               PS2_CONTROL_TX_ENABLE |
 105                               PS2_CONTROL_RX_INT_ENABLE;
 106
 107         return 0;
 108 }
 109
 110 static void maceps2_close(struct serio *dev)
 111 {
 112         struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
 113
 114         data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
 115         udelay(100);
 116         free_irq(data->irq, dev);
 117 }
 118
 119
 120 static struct serio * __devinit maceps2_allocate_port(int idx)
 121 {
 122         struct serio *serio;
 123
 124         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 125         if (serio) {
 126                 serio->id.type          = SERIO_8042;
 127                 serio->write            = maceps2_write;
 128                 serio->open             = maceps2_open;
 129                 serio->close            = maceps2_close;
 130                 snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx);
 131                 snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx);
 132                 serio->port_data        = &port_data[idx];
 133                 serio->dev.parent       = &maceps2_device->dev;
 134         }
 135
 136         return serio;
 137 }
 138
 139 static int __devinit maceps2_probe(struct platform_device *dev)
 140 {
 141         maceps2_port[0] = maceps2_allocate_port(0);
 142         maceps2_port[1] = maceps2_allocate_port(1);
 143         if (!maceps2_port[0] || !maceps2_port[1]) {
 144                 kfree(maceps2_port[0]);
 145                 kfree(maceps2_port[1]);
 146                 return -ENOMEM;
 147         }
 148
 149         serio_register_port(maceps2_port[0]);
 150         serio_register_port(maceps2_port[1]);
 151
 152         return 0;
 153 }
 154
 155 static int __devexit maceps2_remove(struct platform_device *dev)
 156 {
 157         serio_unregister_port(maceps2_port[0]);
 158         serio_unregister_port(maceps2_port[1]);
 159
 160         return 0;
 161 }
 162
 163 static struct platform_driver maceps2_driver = {
 164         .driver         = {
 165                 .name   = "maceps2",
 166                 .owner  = THIS_MODULE,
 167         },
 168         .probe          = maceps2_probe,
 169         .remove         = __devexit_p(maceps2_remove),
 170 };
 171
 172 static int __init maceps2_init(void)
 173 {
 174         int error;
 175
 176         error = platform_driver_register(&maceps2_driver);
 177         if (error)
 178                 return error;
 179
 180         maceps2_device = platform_device_alloc("maceps2", -1);
 181         if (!maceps2_device) {
 182                 error = -ENOMEM;
 183                 goto err_unregister_driver;
 184         }
 185
 186         port_data[0].port = &mace->perif.ps2.keyb;
 187         port_data[0].irq  = MACEISA_KEYB_IRQ;
 188         port_data[1].port = &mace->perif.ps2.mouse;
 189         port_data[1].irq  = MACEISA_MOUSE_IRQ;
 190
 191         error = platform_device_add(maceps2_device);
 192         if (error)
 193                 goto err_free_device;
 194
 195         return 0;
 196
 197  err_free_device:
 198         platform_device_put(maceps2_device);
 199  err_unregister_driver:
 200         platform_driver_unregister(&maceps2_driver);
 201         return error;
 202 }
 203
 204 static void __exit maceps2_exit(void)
 205 {
 206         platform_device_unregister(maceps2_device);
 207         platform_driver_unregister(&maceps2_driver);
 208 }
 209
 210 module_init(maceps2_init);
 211 module_exit(maceps2_exit);