Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 467 insertions, 0 deletions

diff --git a/drivers/input/serio/gscps2.c b/drivers/input/serio/gscps2.c
new file mode 100644
index 000000000000..897e4c12b642
--- /dev/null
+++ b/drivers/input/serio/gscps2.c
@@ -0,0 +1,467 @@
+/*
+ * drivers/input/serio/gscps2.c
+ *
+ * Copyright (c) 2004 Helge Deller <deller@gmx.de>
+ * Copyright (c) 2002 Laurent Canet <canetl@esiee.fr>
+ * Copyright (c) 2002 Thibaut Varene <varenet@parisc-linux.org>
+ *
+ * Pieces of code based on linux-2.4's hp_mouse.c & hp_keyb.c
+ *      Copyright (c) 1999 Alex deVries <alex@onefishtwo.ca>
+ *      Copyright (c) 1999-2000 Philipp Rumpf <prumpf@tux.org>
+ *      Copyright (c) 2000 Xavier Debacker <debackex@esiee.fr>
+ *      Copyright (c) 2000-2001 Thomas Marteau <marteaut@esiee.fr>
+ *
+ * HP GSC PS/2 port driver, found in PA/RISC Workstations
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * TODO:
+ * - Dino testing (did HP ever shipped a machine on which this port
+ *                 was usable/enabled ?)
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/serio.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/pci_ids.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/parisc-device.h>
+
+MODULE_AUTHOR("Laurent Canet <canetl@esiee.fr>, Thibaut Varene <varenet@parisc-linux.org>, Helge Deller <deller@gmx.de>");
+MODULE_DESCRIPTION("HP GSC PS2 port driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(parisc, gscps2_device_tbl);
+
+#define PFX "gscps2.c: "
+
+/*
+ * Driver constants
+ */
+
+/* various constants */
+#define ENABLE                  1
+#define DISABLE                 0
+
+#define GSC_DINO_OFFSET         0x0800  /* offset for DINO controller versus LASI one */
+
+/* PS/2 IO port offsets */
+#define GSC_ID                  0x00    /* device ID offset (see: GSC_ID_XXX) */
+#define GSC_RESET               0x00    /* reset port offset */
+#define GSC_RCVDATA             0x04    /* receive port offset */
+#define GSC_XMTDATA             0x04    /* transmit port offset */
+#define GSC_CONTROL             0x08    /* see: Control register bits */
+#define GSC_STATUS              0x0C    /* see: Status register bits */
+
+/* Control register bits */
+#define GSC_CTRL_ENBL           0x01    /* enable interface */
+#define GSC_CTRL_LPBXR          0x02    /* loopback operation */
+#define GSC_CTRL_DIAG           0x20    /* directly control clock/data line */
+#define GSC_CTRL_DATDIR         0x40    /* data line direct control */
+#define GSC_CTRL_CLKDIR         0x80    /* clock line direct control */
+
+/* Status register bits */
+#define GSC_STAT_RBNE           0x01    /* Receive Buffer Not Empty */
+#define GSC_STAT_TBNE           0x02    /* Transmit Buffer Not Empty */
+#define GSC_STAT_TERR           0x04    /* Timeout Error */
+#define GSC_STAT_PERR           0x08    /* Parity Error */
+#define GSC_STAT_CMPINTR        0x10    /* Composite Interrupt = irq on any port */
+#define GSC_STAT_DATSHD         0x40    /* Data Line Shadow */
+#define GSC_STAT_CLKSHD         0x80    /* Clock Line Shadow */
+
+/* IDs returned by GSC_ID port register */
+#define GSC_ID_KEYBOARD         0       /* device ID values */
+#define GSC_ID_MOUSE            1
+
+
+static irqreturn_t gscps2_interrupt(int irq, void *dev, struct pt_regs *regs);
+
+#define BUFFER_SIZE 0x0f
+
+/* GSC PS/2 port device struct */
+struct gscps2port {
+        struct list_head node;
+        struct parisc_device *padev;
+        struct serio *port;
+        spinlock_t lock;
+        char *addr;
+        u8 act, append; /* position in buffer[] */
+        struct {
+                u8 data;
+                u8 str;
+        } buffer[BUFFER_SIZE+1];
+        int id;
+};
+
+/*
+ * Various HW level routines
+ */
+
+#define gscps2_readb_input(x)           readb((x)+GSC_RCVDATA)
+#define gscps2_readb_control(x)         readb((x)+GSC_CONTROL)
+#define gscps2_readb_status(x)          readb((x)+GSC_STATUS)
+#define gscps2_writeb_control(x, y)     writeb((x), (y)+GSC_CONTROL)
+
+
+/*
+ * wait_TBE() - wait for Transmit Buffer Empty
+ */
+
+static int wait_TBE(char *addr)
+{
+        int timeout = 25000; /* device is expected to react within 250 msec */
+        while (gscps2_readb_status(addr) & GSC_STAT_TBNE) {
+                if (!--timeout)
+                        return 0;       /* This should not happen */
+                udelay(10);
+        }
+        return 1;
+}
+
+
+/*
+ * gscps2_flush() - flush the receive buffer
+ */
+
+static void gscps2_flush(struct gscps2port *ps2port)
+{
+        while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
+                gscps2_readb_input(ps2port->addr);
+        ps2port->act = ps2port->append = 0;
+}
+
+/*
+ * gscps2_writeb_output() - write a byte to the port
+ *
+ * returns 1 on sucess, 0 on error
+ */
+
+static inline int gscps2_writeb_output(struct gscps2port *ps2port, u8 data)
+{
+        unsigned long flags;
+        char *addr = ps2port->addr;
+
+        if (!wait_TBE(addr)) {
+                printk(KERN_DEBUG PFX "timeout - could not write byte %#x\n", data);
+                return 0;
+        }
+
+        while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
+                /* wait */;
+
+        spin_lock_irqsave(&ps2port->lock, flags);
+        writeb(data, addr+GSC_XMTDATA);
+        spin_unlock_irqrestore(&ps2port->lock, flags);
+
+        /* this is ugly, but due to timing of the port it seems to be necessary. */
+        mdelay(6);
+
+        /* make sure any received data is returned as fast as possible */
+        /* this is important e.g. when we set the LEDs on the keyboard */
+        gscps2_interrupt(0, NULL, NULL);
+
+        return 1;
+}
+
+
+/*
+ * gscps2_enable() - enables or disables the port
+ */
+
+static void gscps2_enable(struct gscps2port *ps2port, int enable)
+{
+        unsigned long flags;
+        u8 data;
+
+        /* now enable/disable the port */
+        spin_lock_irqsave(&ps2port->lock, flags);
+        gscps2_flush(ps2port);
+        data = gscps2_readb_control(ps2port->addr);
+        if (enable)
+                data |= GSC_CTRL_ENBL;
+        else
+                data &= ~GSC_CTRL_ENBL;
+        gscps2_writeb_control(data, ps2port->addr);
+        spin_unlock_irqrestore(&ps2port->lock, flags);
+        wait_TBE(ps2port->addr);
+        gscps2_flush(ps2port);
+}
+
+/*
+ * gscps2_reset() - resets the PS/2 port
+ */
+
+static void gscps2_reset(struct gscps2port *ps2port)
+{
+        char *addr = ps2port->addr;
+        unsigned long flags;
+
+        /* reset the interface */
+        spin_lock_irqsave(&ps2port->lock, flags);
+        gscps2_flush(ps2port);
+        writeb(0xff, addr+GSC_RESET);
+        gscps2_flush(ps2port);
+        spin_unlock_irqrestore(&ps2port->lock, flags);
+
+        /* enable it */
+        gscps2_enable(ps2port, ENABLE);
+}
+
+static LIST_HEAD(ps2port_list);
+
+/**
+ * gscps2_interrupt() - Interruption service routine
+ *
+ * This function reads received PS/2 bytes and processes them on
+ * all interfaces.
+ * The problematic part here is, that the keyboard and mouse PS/2 port
+ * share the same interrupt and it's not possible to send data if any
+ * one of them holds input data. To solve this problem we try to receive
+ * the data as fast as possible and handle the reporting to the upper layer
+ * later.
+ */
+
+static irqreturn_t gscps2_interrupt(int irq, void *dev, struct pt_regs *regs)
+{
+        struct gscps2port *ps2port;
+
+        list_for_each_entry(ps2port, &ps2port_list, node) {
+
+          unsigned long flags;
+          spin_lock_irqsave(&ps2port->lock, flags);
+
+          while ( (ps2port->buffer[ps2port->append].str =
+                   gscps2_readb_status(ps2port->addr)) & GSC_STAT_RBNE ) {
+                ps2port->buffer[ps2port->append].data =
+                                gscps2_readb_input(ps2port->addr);
+                ps2port->append = ((ps2port->append+1) & BUFFER_SIZE);
+          }
+
+          spin_unlock_irqrestore(&ps2port->lock, flags);
+
+        } /* list_for_each_entry */
+
+        /* all data was read from the ports - now report the data to upper layer */
+
+        list_for_each_entry(ps2port, &ps2port_list, node) {
+
+          while (ps2port->act != ps2port->append) {
+
+            unsigned int rxflags;
+            u8 data, status;
+
+            /* Did new data arrived while we read existing data ?
+               If yes, exit now and let the new irq handler start over again */
+            if (gscps2_readb_status(ps2port->addr) & GSC_STAT_CMPINTR)
+                return IRQ_HANDLED;
+
+            status = ps2port->buffer[ps2port->act].str;
+            data   = ps2port->buffer[ps2port->act].data;
+
+            ps2port->act = ((ps2port->act+1) & BUFFER_SIZE);
+            rxflags =   ((status & GSC_STAT_TERR) ? SERIO_TIMEOUT : 0 ) |
+                        ((status & GSC_STAT_PERR) ? SERIO_PARITY  : 0 );
+
+            serio_interrupt(ps2port->port, data, rxflags, regs);
+
+          } /* while() */
+
+        } /* list_for_each_entry */
+
+        return IRQ_HANDLED;
+}
+
+
+/*
+ * gscps2_write() - send a byte out through the aux interface.
+ */
+
+static int gscps2_write(struct serio *port, unsigned char data)
+{
+        struct gscps2port *ps2port = port->port_data;
+
+        if (!gscps2_writeb_output(ps2port, data)) {
+                printk(KERN_DEBUG PFX "sending byte %#x failed.\n", data);
+                return -1;
+        }
+        return 0;
+}
+
+/*
+ * gscps2_open() is called when a port is opened by the higher layer.
+ * It resets and enables the port.
+ */
+
+static int gscps2_open(struct serio *port)
+{
+        struct gscps2port *ps2port = port->port_data;
+
+        gscps2_reset(ps2port);
+
+        gscps2_interrupt(0, NULL, NULL);
+
+        return 0;
+}
+
+/*
+ * gscps2_close() disables the port
+ */
+
+static void gscps2_close(struct serio *port)
+{
+        struct gscps2port *ps2port = port->port_data;
+        gscps2_enable(ps2port, DISABLE);
+}
+
+/**
+ * gscps2_probe() - Probes PS2 devices
+ * @return: success/error report
+ */
+
+static int __init gscps2_probe(struct parisc_device *dev)
+{
+        struct gscps2port *ps2port;
+        struct serio *serio;
+        unsigned long hpa = dev->hpa;
+        int ret;
+
+        if (!dev->irq)
+                return -ENODEV;
+
+        /* Offset for DINO PS/2. Works with LASI even */
+        if (dev->id.sversion == 0x96)
+                hpa += GSC_DINO_OFFSET;
+
+        ps2port = kmalloc(sizeof(struct gscps2port), GFP_KERNEL);
+        serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
+        if (!ps2port || !serio) {
+                ret = -ENOMEM;
+                goto fail_nomem;
+        }
+
+        dev_set_drvdata(&dev->dev, ps2port);
+
+        memset(ps2port, 0, sizeof(struct gscps2port));
+        memset(serio, 0, sizeof(struct serio));
+        ps2port->port = serio;
+        ps2port->padev = dev;
+        ps2port->addr = ioremap(hpa, GSC_STATUS + 4);
+        spin_lock_init(&ps2port->lock);
+
+        gscps2_reset(ps2port);
+        ps2port->id = readb(ps2port->addr + GSC_ID) & 0x0f;
+
+        snprintf(serio->name, sizeof(serio->name), "GSC PS/2 %s",
+                 (ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse");
+        strlcpy(serio->phys, dev->dev.bus_id, sizeof(serio->phys));
+        serio->id.type          = SERIO_8042;
+        serio->write            = gscps2_write;
+        serio->open             = gscps2_open;
+        serio->close            = gscps2_close;
+        serio->port_data        = ps2port;
+        serio->dev.parent       = &dev->dev;
+
+        list_add_tail(&ps2port->node, &ps2port_list);
+
+        ret = -EBUSY;
+        if (request_irq(dev->irq, gscps2_interrupt, SA_SHIRQ, ps2port->port->name, ps2port))
+                goto fail_miserably;
+
+        if (ps2port->id != GSC_ID_KEYBOARD && ps2port->id != GSC_ID_MOUSE) {
+                printk(KERN_WARNING PFX "Unsupported PS/2 port at 0x%08lx (id=%d) ignored\n",
+                                hpa, ps2port->id);
+                ret = -ENODEV;
+                goto fail;
+        }
+
+#if 0
+        if (!request_mem_region(hpa, GSC_STATUS + 4, ps2port->port.name))
+                goto fail;
+#endif
+
+        printk(KERN_INFO "serio: %s port at 0x%p irq %d @ %s\n",
+                ps2port->port->name,
+                ps2port->addr,
+                ps2port->padev->irq,
+                ps2port->port->phys);
+
+        serio_register_port(ps2port->port);
+
+        return 0;
+
+fail:
+        free_irq(dev->irq, ps2port);
+
+fail_miserably:
+        list_del(&ps2port->node);
+        iounmap(ps2port->addr);
+        release_mem_region(dev->hpa, GSC_STATUS + 4);
+
+fail_nomem:
+        kfree(ps2port);
+        kfree(serio);
+        return ret;
+}
+
+/**
+ * gscps2_remove() - Removes PS2 devices
+ * @return: success/error report
+ */
+
+static int __devexit gscps2_remove(struct parisc_device *dev)
+{
+        struct gscps2port *ps2port = dev_get_drvdata(&dev->dev);
+
+        serio_unregister_port(ps2port->port);
+        free_irq(dev->irq, ps2port);
+        gscps2_flush(ps2port);
+        list_del(&ps2port->node);
+        iounmap(ps2port->addr);
+#if 0
+        release_mem_region(dev->hpa, GSC_STATUS + 4);
+#endif
+        dev_set_drvdata(&dev->dev, NULL);
+        kfree(ps2port);
+        return 0;
+}
+
+
+static struct parisc_device_id gscps2_device_tbl[] = {
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00084 }, /* LASI PS/2 */
+#ifdef DINO_TESTED
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00096 }, /* DINO PS/2 */
+#endif
+        { 0, }  /* 0 terminated list */
+};
+
+static struct parisc_driver parisc_ps2_driver = {
+        .name           = "GSC PS2",
+        .id_table       = gscps2_device_tbl,
+        .probe          = gscps2_probe,
+        .remove         = gscps2_remove,
+};
+
+static int __init gscps2_init(void)
+{
+        register_parisc_driver(&parisc_ps2_driver);
+        return 0;
+}
+
+static void __exit gscps2_exit(void)
+{
+        unregister_parisc_driver(&parisc_ps2_driver);
+}
+
+
+module_init(gscps2_init);
+module_exit(gscps2_exit);
+