Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / misc / cobalt_btns.c

diff --git a/kernel/drivers/input/misc/cobalt_btns.c b/kernel/drivers/input/misc/cobalt_btns.c
new file mode 100644 (file)
index 0000000..fbe72af
--- /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);