Input: add Atlas button driver

This patch adds support for the buttons on the Atlas wallmount
touchscreen.

Signed-off-by: Jaya Kumar <jayakumar.acpi@gmail.com>
Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 181 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index ba0e88c64e..41b42587f5 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -50,6 +50,16 @@ config INPUT_WISTRON_BTNS
           To compile this driver as a module, choose M here: the module will
           be called wistron_btns.
 
+config INPUT_ATLAS_BTNS
+        tristate "x86 Atlas button interface"
+        depends on X86 && ACPI
+        help
+          Say Y here for support of Atlas wallmount touchscreen buttons.
+          The events will show up as scancodes F1 through F9 via evdev.
+
+          To compile this driver as a module, choose M here: the module will
+          be called atlas_btns.
+
 config INPUT_IXP4XX_BEEPER
         tristate "IXP4XX Beeper support"
         depends on ARCH_IXP4XX
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 415c491789..e0a8d58c9e 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -9,5 +9,6 @@ obj-$(CONFIG_INPUT_PCSPKR)		+= pcspkr.o
 obj-$(CONFIG_INPUT_M68K_BEEP)           += m68kspkr.o
 obj-$(CONFIG_INPUT_UINPUT)              += uinput.o
 obj-$(CONFIG_INPUT_WISTRON_BTNS)        += wistron_btns.o
+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
diff --git a/drivers/input/misc/atlas_btns.c b/drivers/input/misc/atlas_btns.c
new file mode 100644
index 0000000000..0acc3a1236
--- /dev/null
+++ b/drivers/input/misc/atlas_btns.c
@@ -0,0 +1,170 @@
+/*
+ *  atlas_btns.c - Atlas Wallmount Touchscreen ACPI Extras
+ *
+ *  Copyright (C) 2006 Jaya Kumar
+ *  Based on Toshiba ACPI by John Belmonte and ASUS ACPI
+ *  This work was sponsored by CIS(M) Sdn Bhd.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/types.h>
+#include <asm/uaccess.h>
+#include <acpi/acpi_drivers.h>
+
+#define ACPI_ATLAS_NAME                 "Atlas ACPI"
+#define ACPI_ATLAS_CLASS                "Atlas"
+#define ACPI_ATLAS_BUTTON_HID           "ASIM0000"
+
+static struct input_dev *input_dev;
+
+/* button handling code */
+static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
+                    u32 function, void *handler_context, void **return_context)
+{
+        *return_context =
+                (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
+
+        return AE_OK;
+}
+
+static acpi_status acpi_atlas_button_handler(u32 function,
+                      acpi_physical_address address,
+                      u32 bit_width, acpi_integer *value,
+                      void *handler_context, void *region_context)
+{
+        acpi_status status;
+        int keycode;
+
+        if (function == ACPI_WRITE) {
+                keycode = KEY_F1 + (address & 0x0F);
+                input_report_key(input_dev, keycode, !(address & 0x10));
+                input_sync(input_dev);
+                status = 0;
+        } else {
+                printk(KERN_WARNING "atlas: shrugged on unexpected function"
+                        ":function=%x,address=%lx,value=%x\n",
+                        function, (unsigned long)address, (u32)*value);
+                status = -EINVAL;
+        }
+
+        return status;
+}
+
+static int atlas_acpi_button_add(struct acpi_device *device)
+{
+        acpi_status status;
+        int err;
+
+        input_dev = input_allocate_device();
+        if (!input_dev) {
+                printk(KERN_ERR "atlas: unable to allocate input device\n");
+                return -ENOMEM;
+        }
+
+        input_dev->name = "Atlas ACPI button driver";
+        input_dev->phys = "ASIM0000/atlas/input0";
+        input_dev->id.bustype = BUS_HOST;
+        input_dev->evbit[LONG(EV_KEY)] = BIT(EV_KEY);
+
+        set_bit(KEY_F1, input_dev->keybit);
+        set_bit(KEY_F2, input_dev->keybit);
+        set_bit(KEY_F3, input_dev->keybit);
+        set_bit(KEY_F4, input_dev->keybit);
+        set_bit(KEY_F5, input_dev->keybit);
+        set_bit(KEY_F6, input_dev->keybit);
+        set_bit(KEY_F7, input_dev->keybit);
+        set_bit(KEY_F8, input_dev->keybit);
+        set_bit(KEY_F9, input_dev->keybit);
+
+        err = input_register_device(input_dev);
+        if (err) {
+                printk(KERN_ERR "atlas: couldn't register input device\n");
+                input_free_device(input_dev);
+                return err;
+        }
+
+        /* hookup button handler */
+        status = acpi_install_address_space_handler(device->handle,
+                                0x81, &acpi_atlas_button_handler,
+                                &acpi_atlas_button_setup, device);
+        if (ACPI_FAILURE(status)) {
+                printk(KERN_ERR "Atlas: Error installing addr spc handler\n");
+                input_unregister_device(input_dev);
+                status = -EINVAL;
+        }
+
+        return status;
+}
+
+static int atlas_acpi_button_remove(struct acpi_device *device, int type)
+{
+        acpi_status status;
+
+        status = acpi_remove_address_space_handler(device->handle,
+                                0x81, &acpi_atlas_button_handler);
+        if (ACPI_FAILURE(status)) {
+                printk(KERN_ERR "Atlas: Error removing addr spc handler\n");
+                status = -EINVAL;
+        }
+
+        input_unregister_device(input_dev);
+
+        return status;
+}
+
+static struct acpi_driver atlas_acpi_driver = {
+        .name   = ACPI_ATLAS_NAME,
+        .class  = ACPI_ATLAS_CLASS,
+        .ids    = ACPI_ATLAS_BUTTON_HID,
+        .ops    = {
+                .add    = atlas_acpi_button_add,
+                .remove = atlas_acpi_button_remove,
+        },
+};
+
+static int __init atlas_acpi_init(void)
+{
+        int result;
+
+        if (acpi_disabled)
+                return -ENODEV;
+
+        result = acpi_bus_register_driver(&atlas_acpi_driver);
+        if (result < 0) {
+                printk(KERN_ERR "Atlas ACPI: Unable to register driver\n");
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void __exit atlas_acpi_exit(void)
+{
+        acpi_bus_unregister_driver(&atlas_acpi_driver);
+}
+
+module_init(atlas_acpi_init);
+module_exit(atlas_acpi_exit);
+
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Atlas button driver");
+