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/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                                      struct pt_regs *regs)
  77 {
  78         struct serio *dev = dev_id;
  79         struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
  80         unsigned long byte;
  81
  82         if (port->status & PS2_STATUS_RX_FULL) {
  83                 byte = port->rx;
  84                 serio_interrupt(dev, byte & 0xff, 0, regs);
  85         }
  86
  87         return IRQ_HANDLED;
  88 }
  89
  90 static int maceps2_open(struct serio *dev)
  91 {
  92         struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
  93
  94         if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) {
  95                 printk(KERN_ERR "Could not allocate PS/2 IRQ\n");
  96                 return -EBUSY;
  97         }
  98
  99         /* Reset port */
 100         data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
 101         udelay(100);
 102
 103         /* Enable interrupts */
 104         data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE |
 105                               PS2_CONTROL_TX_ENABLE |
 106                               PS2_CONTROL_RX_INT_ENABLE;
 107
 108         return 0;
 109 }
 110
 111 static void maceps2_close(struct serio *dev)
 112 {
 113         struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
 114
 115         data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
 116         udelay(100);
 117         free_irq(data->irq, dev);
 118 }
 119
 120
 121 static struct serio * __init maceps2_allocate_port(int idx)
 122 {
 123         struct serio *serio;
 124
 125         serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
 126         if (serio) {
 127                 memset(serio, 0, sizeof(struct serio));
 128                 serio->id.type          = SERIO_8042;
 129                 serio->write            = maceps2_write;
 130                 serio->open             = maceps2_open;
 131                 serio->close            = maceps2_close;
 132                 snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx);
 133                 snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx);
 134                 serio->port_data        = &port_data[idx];
 135                 serio->dev.parent       = &maceps2_device->dev;
 136         }
 137
 138         return serio;
 139 }
 140
 141
 142 static int __init maceps2_init(void)
 143 {
 144         maceps2_device = platform_device_register_simple("maceps2", -1, NULL, 0);
 145         if (IS_ERR(maceps2_device))
 146                 return PTR_ERR(maceps2_device);
 147
 148         port_data[0].port = &mace->perif.ps2.keyb;
 149         port_data[0].irq  = MACEISA_KEYB_IRQ;
 150         port_data[1].port = &mace->perif.ps2.mouse;
 151         port_data[1].irq  = MACEISA_MOUSE_IRQ;
 152
 153         maceps2_port[0] = maceps2_allocate_port(0);
 154         maceps2_port[1] = maceps2_allocate_port(1);
 155         if (!maceps2_port[0] || !maceps2_port[1]) {
 156                 kfree(maceps2_port[0]);
 157                 kfree(maceps2_port[1]);
 158                 platform_device_unregister(maceps2_device);
 159                 return -ENOMEM;
 160         }
 161
 162         serio_register_port(maceps2_port[0]);
 163         serio_register_port(maceps2_port[1]);
 164
 165         return 0;
 166 }
 167
 168 static void __exit maceps2_exit(void)
 169 {
 170         serio_unregister_port(maceps2_port[0]);
 171         serio_unregister_port(maceps2_port[1]);
 172         platform_device_unregister(maceps2_device);
 173 }
 174
 175 module_init(maceps2_init);
 176 module_exit(maceps2_exit);