Re: [PATCH] Add Cobalt button interface driver support
From: Yoichi Yuasa
Date: Fri Feb 16 2007 - 11:23:23 EST
On Fri, 16 Feb 2007 10:15:11 -0500
"Dmitry Torokhov" <dmitry.torokhov@xxxxxxxxx> wrote:
> On 2/16/07, Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx> wrote:
> > +
> > +static int cobalt_buttons_open(struct inode *inode, struct file *file)
> > +{
> > + buttons_timer.expires = jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL);
> > + add_timer(&buttons_timer);
> > +
> > + return nonseekable_open(inode, file);
> > +
> > +}
>
> Hi,
>
> I am sorry, I was not clear enough - when I was talking about adding
> cobalt_buttons_open/close I was not asking you to add a misc device to
> the driver. I was talking about setting up open() and close() methods
> in input_dev structure. These methods are called by input core when
> first (or last) user opens or closes one of input interfaces, such as
> /dev/input/eventX, /dev/input/jsX, etc and so it is naturally to
> start/stop polling device from these functions.
>
> Does this make sense?
make sense.
updated my patch.
Yoichi
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx>
diff -pruN -X cobalt-buttons/Documentation/dontdiff cobalt-buttons-orig/drivers/input/misc/Kconfig cobalt-buttons/drivers/input/misc/Kconfig
--- cobalt-buttons-orig/drivers/input/misc/Kconfig 2007-02-14 15:35:30.566862000 +0900
+++ cobalt-buttons/drivers/input/misc/Kconfig 2007-02-15 17:20:28.721985250 +0900
@@ -89,4 +89,10 @@ config HP_SDC_RTC
Say Y here if you want to support the built-in real time clock
of the HP SDC controller.
+config INPUT_COBALT_BTNS
+ tristate "Cobalt button interface"
+ depends on MIPS_COBALT
+ help
+ Say Y here if you want to support MIPS Cobalt button interface.
+
endif
diff -pruN -X cobalt-buttons/Documentation/dontdiff cobalt-buttons-orig/drivers/input/misc/Makefile cobalt-buttons/drivers/input/misc/Makefile
--- cobalt-buttons-orig/drivers/input/misc/Makefile 2007-02-14 15:35:30.566862000 +0900
+++ cobalt-buttons/drivers/input/misc/Makefile 2007-02-15 11:55:30.856042500 +0900
@@ -12,3 +12,4 @@ obj-$(CONFIG_INPUT_WISTRON_BTNS) += wist
obj-$(CONFIG_INPUT_ATLAS_BTNS) += atlas_btns.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
+obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
diff -pruN -X cobalt-buttons/Documentation/dontdiff cobalt-buttons-orig/drivers/input/misc/cobalt_btns.c cobalt-buttons/drivers/input/misc/cobalt_btns.c
--- cobalt-buttons-orig/drivers/input/misc/cobalt_btns.c 1970-01-01 09:00:00.000000000 +0900
+++ cobalt-buttons/drivers/input/misc/cobalt_btns.c 2007-02-17 01:14:33.079876500 +0900
@@ -0,0 +1,211 @@
+/*
+ * Cobalt button interface driver.
+ *
+ * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx>
+ *
+ * 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)
+{
+ buttons_timer.expires = jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL);
+ add_timer(&buttons_timer);
+
+ return 0;
+}
+
+static void cobalt_buttons_close(struct input_dev *dev)
+{
+ del_timer_sync(&buttons_timer);
+}
+
+static int __init cobalt_buttons_probe(struct platform_device *pdev)
+{
+ struct buttons_dev *bdev;
+ struct input_dev *input;
+ struct resource *res;
+ int retval, i;
+
+ bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
+ if (!bdev)
+ return -ENOMEM;
+
+ input = input_allocate_device();
+ if (!input) {
+ kfree(bdev);
+ return -ENOMEM;
+ }
+
+ 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) {
+ input_free_device(input);
+ kfree(bdev);
+ return -EBUSY;
+ }
+
+ 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);
+
+ retval = input_register_device(input);
+ if (retval < 0) {
+ del_timer_sync(&buttons_timer);
+ dev_set_drvdata(&pdev->dev, NULL);
+ iounmap(bdev->reg);
+ input_free_device(input);
+ kfree(bdev);
+ }
+
+ return retval;
+}
+
+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);
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/