Linux-2.6.12-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!
diff --git a/drivers/input/serio/gscps2.c b/drivers/input/serio/gscps2.c
new file mode 100644
index 0000000..897e4c1
--- /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);
+