This driver adds support for the volume buttons on the front of every
SGI O2 workstation.
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
---
Please apply for 2.6.27.
drivers/input/misc/Kconfig | 10 +++
drivers/input/misc/Makefile | 1 +
drivers/input/misc/sgio2_btns.c | 154 +++++++++++++++++++++++++++++++++++++++
3 files changed, 165 insertions(+), 0 deletions(-)
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 432699d..e33d7cb 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -189,6 +189,16 @@ config INPUT_UINPUT
To compile this driver as a module, choose M here: the
module will be called uinput.
+config INPUT_SGIO2_BTNS
+ tristate "SGI O2 volume button interface"
+ depends on SGI_IP32
+ select INPUT_POLLDEV
+ help
+ Say Y here if you want to support SGI O2 volume button interface.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sgio_btns.
+
config HP_SDC_RTC
tristate "HP SDC Real Time Clock"
depends on GSC || HP300
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index ebd39f2..0e274f1 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_INPUT_YEALINK) += yealink.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_UINPUT) += uinput.o
obj-$(CONFIG_INPUT_APANEL) += apanel.o
+obj-$(CONFIG_INPUT_SGIO2_BTNS) += sgio2_btns.o
diff --git a/drivers/input/misc/sgio2_btns.c b/drivers/input/misc/sgio2_btns.c
new file mode 100644
index 0000000..ef144a9
--- /dev/null
+++ b/drivers/input/misc/sgio2_btns.c
@@ -0,0 +1,154 @@
+/*
+ * SGI O2 Volume Button interface driver
+ *
+ * Copyright (C) 2008 Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
+ *
+ * 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-polldev.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/ip32/mace.h>
+
+#define BUTTONS_POLL_INTERVAL 30 /* msec */
+#define BUTTONS_COUNT_THRESHOLD 3
+
+static const unsigned short sgio2_map[] = {
+ KEY_VOLUMEUP,
+ KEY_VOLUMEDOWN
+};
+
+struct buttons_dev {
+ struct input_polled_dev *poll_dev;
+ unsigned short keymap[ARRAY_SIZE(sgio2_map)];
+ int count[ARRAY_SIZE(sgio2_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;
+ u64 status;
+ int i;
+
+ status = (readq(&mace->perif.audio.control) >> 23) & 3;
+
+ for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
+ if (status & (1U << i)) {
+ writeq(status & ~(1U << i), &mace->perif.audio.control);
+ 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 __devinit sgio2_buttons_probe(struct platform_device *pdev)
+{
+ struct buttons_dev *bdev;
+ struct input_polled_dev *poll_dev;
+ struct input_dev *input;
+ 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, sgio2_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 = "SGI O2 buttons";
+ input->phys = "sgio2/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(sgio2_map); i++)
+ __set_bit(bdev->keymap[i], input->keybit);
+ __clear_bit(KEY_RESERVED, input->keybit);
+
+ bdev->poll_dev = poll_dev;
+ dev_set_drvdata(&pdev->dev, bdev);
+
+ error = input_register_polled_device(poll_dev);
+ if (!error)
+ return 0;
+
+ err_free_mem:
+ input_free_polled_device(poll_dev);
+ kfree(bdev);
+ dev_set_drvdata(&pdev->dev, NULL);
+ return error;
+}
+
+static int __devexit sgio2_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);
+ kfree(bdev);
+ dev_set_drvdata(dev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver sgio2_buttons_driver = {
+ .probe = sgio2_buttons_probe,
+ .remove = __devexit_p(sgio2_buttons_remove),
+ .driver = {
+ .name = "sgio2btns",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init sgio2_buttons_init(void)
+{
+ return platform_driver_register(&sgio2_buttons_driver);
+}
+
+static void __exit sgio2_buttons_exit(void)
+{
+ platform_driver_unregister(&sgio2_buttons_driver);
+}
+
+module_init(sgio2_buttons_init);
+module_exit(sgio2_buttons_exit);
--
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