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Message-Id: <1254985152-32407-1-git-send-email-thomas@wytron.com.tw>
Date: Thu, 8 Oct 2009 14:59:12 +0800
From: Thomas Chou <thomas@...ron.com.tw>
To: linux-input@...r.kernel.org
Cc: Nios2 development list <nios2-dev@...c.et.ntust.edu.tw>,
linux-kernel@...r.kernel.org, Thomas Chou <thomas@...ron.com.tw>
Subject: [PATCH] input: New driver for Altera PS/2 controller
This patch adds a new SERIO driver to support the Altera University
Program PS/2 controller.
Signed-off-by: Thomas Chou <thomas@...ron.com.tw>
---
drivers/input/serio/Kconfig | 9 ++
drivers/input/serio/Makefile | 1 +
drivers/input/serio/altera_ps2.c | 185 ++++++++++++++++++++++++++++++++++++++
3 files changed, 195 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/serio/altera_ps2.c
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index c4b3fbd..1e9f9ea 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -200,4 +200,13 @@ config SERIO_XILINX_XPS_PS2
To compile this driver as a module, choose M here: the
module will be called xilinx_ps2.
+config SERIO_ALTERA_PS2
+ tristate "Altera UP PS/2 controller"
+ depends on EMBEDDED
+ help
+ Say Y here if you have Altera University Program PS/2 ports.
+
+ To compile this driver as a module, choose M here: the
+ module will be called altera_ps2.
+
endif
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
index 9b6c813..bf945f7 100644
--- a/drivers/input/serio/Makefile
+++ b/drivers/input/serio/Makefile
@@ -22,3 +22,4 @@ obj-$(CONFIG_SERIO_MACEPS2) += maceps2.o
obj-$(CONFIG_SERIO_LIBPS2) += libps2.o
obj-$(CONFIG_SERIO_RAW) += serio_raw.o
obj-$(CONFIG_SERIO_XILINX_XPS_PS2) += xilinx_ps2.o
+obj-$(CONFIG_SERIO_ALTERA_PS2) += altera_ps2.o
diff --git a/drivers/input/serio/altera_ps2.c b/drivers/input/serio/altera_ps2.c
new file mode 100644
index 0000000..6a7ef09
--- /dev/null
+++ b/drivers/input/serio/altera_ps2.c
@@ -0,0 +1,185 @@
+/*
+ * Altera University Program PS2 controller driver
+ *
+ * Copyright (C) 2008 Thomas Chou <thomas@...ron.com.tw>
+ *
+ * Based on sa1111ps2.c, which is:
+ * Copyright (C) 2002 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#define DRV_NAME "altera_ps2"
+
+struct ps2if {
+ struct serio *io;
+ struct platform_device *dev;
+ unsigned base;
+ unsigned irq;
+};
+
+/*
+ * Read all bytes waiting in the PS2 port. There should be
+ * at the most one, but we loop for safety.
+ */
+static irqreturn_t ps2_rxint(int irq, void *dev_id)
+{
+ struct ps2if *ps2if = dev_id;
+ unsigned int status;
+ int handled = IRQ_NONE;
+
+ while ((status = readl(ps2if->base)) & 0xffff0000) {
+ serio_interrupt(ps2if->io, status & 0xff, 0);
+ handled = IRQ_HANDLED;
+ }
+ return handled;
+}
+
+/*
+ * Write a byte to the PS2 port.
+ */
+static int ps2_write(struct serio *io, unsigned char val)
+{
+ struct ps2if *ps2if = io->port_data;
+
+ writel(val, ps2if->base);
+ return 0;
+}
+
+static int ps2_open(struct serio *io)
+{
+ struct ps2if *ps2if = io->port_data;
+ int ret;
+
+ ret = request_irq(ps2if->irq, ps2_rxint, 0,
+ DRV_NAME, ps2if);
+ if (ret) {
+ printk(KERN_ERR DRV_NAME ": could not allocate IRQ%d: %d\n",
+ ps2if->irq, ret);
+ return ret;
+ }
+ writel(1, ps2if->base + 4); /* enable rx irq */
+ return 0;
+}
+
+static void ps2_close(struct serio *io)
+{
+ struct ps2if *ps2if = io->port_data;
+
+ writel(0, ps2if->base); /* disable rx irq */
+ free_irq(ps2if->irq, ps2if);
+}
+
+/*
+ * Add one device to this driver.
+ */
+static int ps2_probe(struct platform_device *dev)
+{
+ struct ps2if *ps2if;
+ struct serio *serio;
+ struct resource *res;
+ int ret;
+
+ ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
+ serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
+ if (!ps2if || !serio) {
+ ret = -ENOMEM;
+ goto free;
+ }
+
+ serio->id.type = SERIO_8042;
+ serio->write = ps2_write;
+ serio->open = ps2_open;
+ serio->close = ps2_close;
+ strlcpy(serio->name, dev_name(&dev->dev), sizeof(serio->name));
+ strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
+ serio->port_data = ps2if;
+ serio->dev.parent = &dev->dev;
+ ps2if->io = serio;
+ ps2if->dev = dev;
+ platform_set_drvdata(dev, ps2if);
+
+ res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ ret = -ENOENT;
+ goto free;
+ }
+ ps2if->irq = platform_get_irq(dev, 0);
+ if (ps2if->irq < 0) {
+ ret = -ENXIO;
+ goto free;
+ }
+ ps2if->base = (unsigned) ioremap(res->start,
+ (res->end - res->start) + 1);
+ if (!ps2if->base) {
+ ret = -ENOMEM;
+ goto free;
+ }
+ printk(KERN_INFO DRV_NAME ": base %08x irq %d\n",
+ ps2if->base, ps2if->irq);
+ /* clear fifo */
+ while (readl(ps2if->base) & 0xffff0000)
+ ;
+ serio_register_port(ps2if->io);
+ return 0;
+
+ free:
+ platform_set_drvdata(dev, NULL);
+ kfree(ps2if);
+ kfree(serio);
+ return ret;
+}
+
+/*
+ * Remove one device from this driver.
+ */
+static int ps2_remove(struct platform_device *dev)
+{
+ struct ps2if *ps2if = platform_get_drvdata(dev);
+
+ platform_set_drvdata(dev, NULL);
+ serio_unregister_port(ps2if->io);
+ iounmap((void *)ps2if->base);
+ kfree(ps2if);
+
+ return 0;
+}
+
+/*
+ * Our device driver structure
+ */
+static struct platform_driver ps2_driver = {
+ .probe = ps2_probe,
+ .remove = ps2_remove,
+ .driver = {
+ .name = DRV_NAME,
+ },
+};
+
+static int __init ps2_init(void)
+{
+ return platform_driver_register(&ps2_driver);
+}
+
+static void __exit ps2_exit(void)
+{
+ platform_driver_unregister(&ps2_driver);
+}
+
+module_init(ps2_init);
+module_exit(ps2_exit);
+
+MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
+MODULE_AUTHOR("Thomas Chou <thomas@...ron.com.tw>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
--
1.6.2.5
--
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