--- /dev/null
+/*
+ * Cobalt button interface driver.
+ *
+ * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
+ *
+ * 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/init.h>
+#include <linux/input.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
+
+#define BUTTONS_POLL_INTERVAL 30 /* msec */
+#define BUTTONS_COUNT_THRESHOLD 3
+#define BUTTONS_STATUS_MASK 0xfe000000
+
+struct buttons_dev {
+ struct input_dev *input;
+ void __iomem *reg;
+};
+
+struct buttons_map {
+ uint32_t mask;
+ int keycode;
+ int count;
+};
+
+static struct buttons_map buttons_map[] = {
+ { 0x02000000, KEY_RESTART, },
+ { 0x04000000, KEY_LEFT, },
+ { 0x08000000, KEY_UP, },
+ { 0x10000000, KEY_DOWN, },
+ { 0x20000000, KEY_RIGHT, },
+ { 0x40000000, KEY_ENTER, },
+ { 0x80000000, KEY_SELECT, },
+};
+
+static struct resource cobalt_buttons_resource __initdata = {
+ .start = 0x1d000000,
+ .end = 0x1d000003,
+ .flags = IORESOURCE_MEM,
+};
+
+static struct platform_device *cobalt_buttons_device;
+
+static struct timer_list buttons_timer;
+
+static void handle_buttons(unsigned long data)
+{
+ struct buttons_map *button = buttons_map;
+ struct buttons_dev *bdev;
+ uint32_t status;
+ int i;
+
+ bdev = (struct buttons_dev *)data;
+ status = readl(bdev->reg);
+ status = ~status & BUTTONS_STATUS_MASK;
+
+ for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
+ if (status & button->mask) {
+ button->count++;
+ } else {
+ if (button->count >= BUTTONS_COUNT_THRESHOLD) {
+ input_report_key(bdev->input, button->keycode, 0);
+ input_sync(bdev->input);
+ }
+ button->count = 0;
+ }
+
+ if (button->count == BUTTONS_COUNT_THRESHOLD) {
+ input_report_key(bdev->input, button->keycode, 1);
+ input_sync(bdev->input);
+ }
+
+ button++;
+ }
+
+ mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL));
+}
+
+static int cobalt_buttons_open(struct input_dev *dev)
+{
+ mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL));
+
+ return 0;
+}
+
+static void cobalt_buttons_close(struct input_dev *dev)
+{
+ del_timer_sync(&buttons_timer);
+}
+
+static int __devinit cobalt_buttons_probe(struct platform_device *pdev)
+{
+ struct buttons_dev *bdev;
+ struct input_dev *input;
+ struct resource *res;
+ int error, i;
+
+ bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
+ input = input_allocate_device();
+ if (!bdev || !input) {
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ input->name = "Cobalt buttons";
+ input->phys = "cobalt/input0";
+ input->id.bustype = BUS_HOST;
+ input->cdev.dev = &pdev->dev;
+ input->open = cobalt_buttons_open;
+ input->close = cobalt_buttons_close;
+
+ input->evbit[0] = BIT(EV_KEY);
+ for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
+ set_bit(buttons_map[i].keycode, input->keybit);
+ buttons_map[i].count = 0;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ error = -EBUSY;
+ goto err_free_mem;
+ }
+
+ bdev->input = input;
+ bdev->reg = ioremap(res->start, res->end - res->start + 1);
+ dev_set_drvdata(&pdev->dev, bdev);
+
+ setup_timer(&buttons_timer, handle_buttons, (unsigned long)bdev);
+
+ error = input_register_device(input);
+ if (error)
+ goto err_iounmap;
+
+ return 0;
+
+ err_iounmap:
+ iounmap(bdev->reg);
+ err_free_mem:
+ input_free_device(input);
+ kfree(bdev);
+ dev_set_drvdata(&pdev->dev, NULL);
+ return error;
+}
+
+static int __devexit cobalt_buttons_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct buttons_dev *bdev = dev_get_drvdata(dev);
+
+ input_unregister_device(bdev->input);
+ iounmap(bdev->reg);
+ kfree(bdev);
+ dev_set_drvdata(dev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver cobalt_buttons_driver = {
+ .probe = cobalt_buttons_probe,
+ .remove = __devexit_p(cobalt_buttons_remove),
+ .driver = {
+ .name = "Cobalt buttons",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init cobalt_buttons_init(void)
+{
+ int retval;
+
+ cobalt_buttons_device = platform_device_register_simple("Cobalt buttons", -1,
+ &cobalt_buttons_resource, 1);
+ if (IS_ERR(cobalt_buttons_device)) {
+ retval = PTR_ERR(cobalt_buttons_device);
+ return retval;
+ }
+
+ retval = platform_driver_register(&cobalt_buttons_driver);
+ if (retval < 0)
+ platform_device_unregister(cobalt_buttons_device);
+
+ return retval;
+}
+
+static void __exit cobalt_buttons_exit(void)
+{
+ platform_driver_unregister(&cobalt_buttons_driver);
+ platform_device_unregister(cobalt_buttons_device);
+}
+
+module_init(cobalt_buttons_init);
+module_exit(cobalt_buttons_exit);
projects / firefly-linux-kernel-4.4.55.git / commitdiff