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