Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / serio / q40kbd.c

diff --git a/kernel/drivers/input/serio/q40kbd.c b/kernel/drivers/input/serio/q40kbd.c
new file mode 100644 (file)
index 0000000..5a9d521
--- /dev/null
+++ b/kernel/drivers/input/serio/q40kbd.c
@@ -0,0 +1,193 @@
+/*
+ *  Copyright (c) 2000-2001 Vojtech Pavlik
+ *
+ *  Based on the work of:
+ *     Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
+ */
+
+/*
+ * Q40 PS/2 keyboard controller driver for Linux/m68k
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Should you need to contact me, the author, you can do so either by
+ * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
+ * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
+ */
+
+#include <linux/module.h>
+#include <linux/serio.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/q40_master.h>
+#include <asm/irq.h>
+#include <asm/q40ints.h>
+
+#define DRV_NAME       "q40kbd"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+
+struct q40kbd {
+       struct serio *port;
+       spinlock_t lock;
+};
+
+static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
+{
+       struct q40kbd *q40kbd = dev_id;
+       unsigned long flags;
+
+       spin_lock_irqsave(&q40kbd->lock, flags);
+
+       if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
+               serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
+
+       master_outb(-1, KEYBOARD_UNLOCK_REG);
+
+       spin_unlock_irqrestore(&q40kbd->lock, flags);
+
+       return IRQ_HANDLED;
+}
+
+/*
+ * q40kbd_flush() flushes all data that may be in the keyboard buffers
+ */
+
+static void q40kbd_flush(struct q40kbd *q40kbd)
+{
+       int maxread = 100;
+       unsigned long flags;
+
+       spin_lock_irqsave(&q40kbd->lock, flags);
+
+       while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
+               master_inb(KEYCODE_REG);
+
+       spin_unlock_irqrestore(&q40kbd->lock, flags);
+}
+
+static void q40kbd_stop(void)
+{
+       master_outb(0, KEY_IRQ_ENABLE_REG);
+       master_outb(-1, KEYBOARD_UNLOCK_REG);
+}
+
+/*
+ * q40kbd_open() is called when a port is open by the higher layer.
+ * It allocates the interrupt and enables in in the chip.
+ */
+
+static int q40kbd_open(struct serio *port)
+{
+       struct q40kbd *q40kbd = port->port_data;
+
+       q40kbd_flush(q40kbd);
+
+       /* off we go */
+       master_outb(-1, KEYBOARD_UNLOCK_REG);
+       master_outb(1, KEY_IRQ_ENABLE_REG);
+
+       return 0;
+}
+
+static void q40kbd_close(struct serio *port)
+{
+       struct q40kbd *q40kbd = port->port_data;
+
+       q40kbd_stop();
+       q40kbd_flush(q40kbd);
+}
+
+static int q40kbd_probe(struct platform_device *pdev)
+{
+       struct q40kbd *q40kbd;
+       struct serio *port;
+       int error;
+
+       q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
+       port = kzalloc(sizeof(struct serio), GFP_KERNEL);
+       if (!q40kbd || !port) {
+               error = -ENOMEM;
+               goto err_free_mem;
+       }
+
+       q40kbd->port = port;
+       spin_lock_init(&q40kbd->lock);
+
+       port->id.type = SERIO_8042;
+       port->open = q40kbd_open;
+       port->close = q40kbd_close;
+       port->port_data = q40kbd;
+       port->dev.parent = &pdev->dev;
+       strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
+       strlcpy(port->phys, "Q40", sizeof(port->phys));
+
+       q40kbd_stop();
+
+       error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
+                           DRV_NAME, q40kbd);
+       if (error) {
+               dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
+               goto err_free_mem;
+       }
+
+       serio_register_port(q40kbd->port);
+
+       platform_set_drvdata(pdev, q40kbd);
+       printk(KERN_INFO "serio: Q40 kbd registered\n");
+
+       return 0;
+
+err_free_mem:
+       kfree(port);
+       kfree(q40kbd);
+       return error;
+}
+
+static int q40kbd_remove(struct platform_device *pdev)
+{
+       struct q40kbd *q40kbd = platform_get_drvdata(pdev);
+
+       /*
+        * q40kbd_close() will be called as part of unregistering
+        * and will ensure that IRQ is turned off, so it is safe
+        * to unregister port first and free IRQ later.
+        */
+       serio_unregister_port(q40kbd->port);
+       free_irq(Q40_IRQ_KEYBOARD, q40kbd);
+       kfree(q40kbd);
+
+       return 0;
+}
+
+static struct platform_driver q40kbd_driver = {
+       .driver         = {
+               .name   = "q40kbd",
+       },
+       .remove         = q40kbd_remove,
+};
+
+module_platform_driver_probe(q40kbd_driver, q40kbd_probe);