1 files changed, 162 insertions, 0 deletions

diff --git a/kernel/drivers/input/misc/cobalt_btns.c b/kernel/drivers/input/misc/cobalt_btns.c
new file mode 100644
index 000000000..fbe72afc9
--- /dev/null
+++ b/kernel/drivers/input/misc/cobalt_btns.c
@@ -0,0 +1,162 @@
+/*
+ *  Cobalt button interface driver.
+ *
+ *  Copyright (C) 2007-2008  Yoichi Yuasa <yuasa@linux-mips.org>
+ *
+ *  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/input-polldev.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define BUTTONS_POLL_INTERVAL	30	/* msec */
+#define BUTTONS_COUNT_THRESHOLD	3
+#define BUTTONS_STATUS_MASK	0xfe000000
+
+static const unsigned short cobalt_map[] = {
+	KEY_RESERVED,
+	KEY_RESTART,
+	KEY_LEFT,
+	KEY_UP,
+	KEY_DOWN,
+	KEY_RIGHT,
+	KEY_ENTER,
+	KEY_SELECT
+};
+
+struct buttons_dev {
+	struct input_polled_dev *poll_dev;
+	unsigned short keymap[ARRAY_SIZE(cobalt_map)];
+	int count[ARRAY_SIZE(cobalt_map)];
+	void __iomem *reg;
+};
+
+static void handle_buttons(struct input_polled_dev *dev)
+{
+	struct buttons_dev *bdev = dev->private;
+	struct input_dev *input = dev->input;
+	uint32_t status;
+	int i;
+
+	status = ~readl(bdev->reg) >> 24;
+
+	for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
+		if (status & (1U << i)) {
+			if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
+				input_event(input, EV_MSC, MSC_SCAN, i);
+				input_report_key(input, bdev->keymap[i], 1);
+				input_sync(input);
+			}
+		} else {
+			if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
+				input_event(input, EV_MSC, MSC_SCAN, i);
+				input_report_key(input, bdev->keymap[i], 0);
+				input_sync(input);
+			}
+			bdev->count[i] = 0;
+		}
+	}
+}
+
+static int cobalt_buttons_probe(struct platform_device *pdev)
+{
+	struct buttons_dev *bdev;
+	struct input_polled_dev *poll_dev;
+	struct input_dev *input;
+	struct resource *res;
+	int error, i;
+
+	bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
+	poll_dev = input_allocate_polled_device();
+	if (!bdev || !poll_dev) {
+		error = -ENOMEM;
+		goto err_free_mem;
+	}
+
+	memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
+
+	poll_dev->private = bdev;
+	poll_dev->poll = handle_buttons;
+	poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
+
+	input = poll_dev->input;
+	input->name = "Cobalt buttons";
+	input->phys = "cobalt/input0";
+	input->id.bustype = BUS_HOST;
+	input->dev.parent = &pdev->dev;
+
+	input->keycode = bdev->keymap;
+	input->keycodemax = ARRAY_SIZE(bdev->keymap);
+	input->keycodesize = sizeof(unsigned short);
+
+	input_set_capability(input, EV_MSC, MSC_SCAN);
+	__set_bit(EV_KEY, input->evbit);
+	for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
+		__set_bit(bdev->keymap[i], input->keybit);
+	__clear_bit(KEY_RESERVED, input->keybit);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		error = -EBUSY;
+		goto err_free_mem;
+	}
+
+	bdev->poll_dev = poll_dev;
+	bdev->reg = ioremap(res->start, resource_size(res));
+	dev_set_drvdata(&pdev->dev, bdev);
+
+	error = input_register_polled_device(poll_dev);
+	if (error)
+		goto err_iounmap;
+
+	return 0;
+
+ err_iounmap:
+	iounmap(bdev->reg);
+ err_free_mem:
+	input_free_polled_device(poll_dev);
+	kfree(bdev);
+	return error;
+}
+
+static int cobalt_buttons_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct buttons_dev *bdev = dev_get_drvdata(dev);
+
+	input_unregister_polled_device(bdev->poll_dev);
+	input_free_polled_device(bdev->poll_dev);
+	iounmap(bdev->reg);
+	kfree(bdev);
+
+	return 0;
+}
+
+MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
+MODULE_DESCRIPTION("Cobalt button interface driver");
+MODULE_LICENSE("GPL");
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:Cobalt buttons");
+
+static struct platform_driver cobalt_buttons_driver = {
+	.probe	= cobalt_buttons_probe,
+	.remove	= cobalt_buttons_remove,
+	.driver	= {
+		.name	= "Cobalt buttons",
+	},
+};
+module_platform_driver(cobalt_buttons_driver);