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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/input/misc/cobalt_btns.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/misc/cobalt_btns.c')
-rw-r--r--drivers/input/misc/cobalt_btns.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/input/misc/cobalt_btns.c b/drivers/input/misc/cobalt_btns.c
new file mode 100644
index 0000000000..b1624f5414
--- /dev/null
+++ b/drivers/input/misc/cobalt_btns.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Cobalt button interface driver.
+ *
+ * Copyright (C) 2007-2008 Yoichi Yuasa <yuasa@linux-mips.org>
+ */
+#include <linux/input.h>
+#include <linux/io.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 {
+ unsigned short keymap[ARRAY_SIZE(cobalt_map)];
+ int count[ARRAY_SIZE(cobalt_map)];
+ void __iomem *reg;
+};
+
+static void handle_buttons(struct input_dev *input)
+{
+ struct buttons_dev *bdev = input_get_drvdata(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_dev *input;
+ struct resource *res;
+ int error, i;
+
+ bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
+ if (!bdev)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EBUSY;
+
+ bdev->reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!bdev->reg)
+ return -ENOMEM;
+
+ memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
+
+ input = devm_input_allocate_device(&pdev->dev);
+ if (!input)
+ return -ENOMEM;
+
+ input_set_drvdata(input, bdev);
+
+ input->name = "Cobalt buttons";
+ input->phys = "cobalt/input0";
+ input->id.bustype = BUS_HOST;
+
+ 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);
+
+
+ error = input_setup_polling(input, handle_buttons);
+ if (error)
+ return error;
+
+ input_set_poll_interval(input, BUTTONS_POLL_INTERVAL);
+
+ error = input_register_device(input);
+ if (error)
+ return error;
+
+ 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,
+ .driver = {
+ .name = "Cobalt buttons",
+ },
+};
+module_platform_driver(cobalt_buttons_driver);