classmate-laptop: add support for Classmate PC ACPI devices

This add supports for devices like keyboard, backlight, tablet and
accelerometer.

This work is supported by International Syst S/A.

[randy.dunlap@oracle.com: cmpc_acpi: depends on ACPI]
[akpm@linux-foundation.org: readability tweaks]
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 622 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index fc5bf9d2a3f3..ec4faffe6b05 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -464,4 +464,16 @@ config TOSHIBA_BT_RFKILL
 
           If you have a modern Toshiba laptop with a Bluetooth and an
           RFKill switch (such as the Portege R500), say Y.
+
+config ACPI_CMPC
+        tristate "CMPC Laptop Extras"
+        depends on X86 && ACPI
+        select INPUT
+        select BACKLIGHT_CLASS_DEVICE
+        default n
+        help
+          Support for Intel Classmate PC ACPI devices, including some
+          keys as input device, backlight device, tablet and accelerometer
+          devices.
+
 endif # X86_PLATFORM_DEVICES
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index b7474b6a8bf1..9cd9fa0a27e6 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -5,6 +5,7 @@
 obj-$(CONFIG_ASUS_LAPTOP)       += asus-laptop.o
 obj-$(CONFIG_EEEPC_LAPTOP)      += eeepc-laptop.o
 obj-$(CONFIG_MSI_LAPTOP)        += msi-laptop.o
+obj-$(CONFIG_ACPI_CMPC)         += classmate-laptop.o
 obj-$(CONFIG_COMPAL_LAPTOP)     += compal-laptop.o
 obj-$(CONFIG_DELL_LAPTOP)       += dell-laptop.o
 obj-$(CONFIG_DELL_WMI)          += dell-wmi.o
diff --git a/drivers/platform/x86/classmate-laptop.c b/drivers/platform/x86/classmate-laptop.c
new file mode 100644
index 000000000000..ed90082cdf1d
--- /dev/null
+++ b/drivers/platform/x86/classmate-laptop.c
@@ -0,0 +1,609 @@
+/*
+ *  Copyright (C) 2009  Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
+ *
+ *  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/module.h>
+#include <linux/workqueue.h>
+#include <acpi/acpi_drivers.h>
+#include <linux/backlight.h>
+#include <linux/input.h>
+
+MODULE_LICENSE("GPL");
+
+
+struct cmpc_accel {
+        int sensitivity;
+};
+
+#define CMPC_ACCEL_SENSITIVITY_DEFAULT          5
+
+
+/*
+ * Generic input device code.
+ */
+
+typedef void (*input_device_init)(struct input_dev *dev);
+
+static int cmpc_add_acpi_notify_device(struct acpi_device *acpi, char *name,
+                                       input_device_init idev_init)
+{
+        struct input_dev *inputdev;
+        int error;
+
+        inputdev = input_allocate_device();
+        if (!inputdev)
+                return -ENOMEM;
+        inputdev->name = name;
+        inputdev->dev.parent = &acpi->dev;
+        idev_init(inputdev);
+        error = input_register_device(inputdev);
+        if (error) {
+                input_free_device(inputdev);
+                return error;
+        }
+        dev_set_drvdata(&acpi->dev, inputdev);
+        return 0;
+}
+
+static int cmpc_remove_acpi_notify_device(struct acpi_device *acpi)
+{
+        struct input_dev *inputdev = dev_get_drvdata(&acpi->dev);
+        input_unregister_device(inputdev);
+        return 0;
+}
+
+/*
+ * Accelerometer code.
+ */
+static acpi_status cmpc_start_accel(acpi_handle handle)
+{
+        union acpi_object param[2];
+        struct acpi_object_list input;
+        acpi_status status;
+
+        param[0].type = ACPI_TYPE_INTEGER;
+        param[0].integer.value = 0x3;
+        param[1].type = ACPI_TYPE_INTEGER;
+        input.count = 2;
+        input.pointer = param;
+        status = acpi_evaluate_object(handle, "ACMD", &input, NULL);
+        return status;
+}
+
+static acpi_status cmpc_stop_accel(acpi_handle handle)
+{
+        union acpi_object param[2];
+        struct acpi_object_list input;
+        acpi_status status;
+
+        param[0].type = ACPI_TYPE_INTEGER;
+        param[0].integer.value = 0x4;
+        param[1].type = ACPI_TYPE_INTEGER;
+        input.count = 2;
+        input.pointer = param;
+        status = acpi_evaluate_object(handle, "ACMD", &input, NULL);
+        return status;
+}
+
+static acpi_status cmpc_accel_set_sensitivity(acpi_handle handle, int val)
+{
+        union acpi_object param[2];
+        struct acpi_object_list input;
+
+        param[0].type = ACPI_TYPE_INTEGER;
+        param[0].integer.value = 0x02;
+        param[1].type = ACPI_TYPE_INTEGER;
+        param[1].integer.value = val;
+        input.count = 2;
+        input.pointer = param;
+        return acpi_evaluate_object(handle, "ACMD", &input, NULL);
+}
+
+static acpi_status cmpc_get_accel(acpi_handle handle,
+                                  unsigned char *x,
+                                  unsigned char *y,
+                                  unsigned char *z)
+{
+        union acpi_object param[2];
+        struct acpi_object_list input;
+        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, 0 };
+        unsigned char *locs;
+        acpi_status status;
+
+        param[0].type = ACPI_TYPE_INTEGER;
+        param[0].integer.value = 0x01;
+        param[1].type = ACPI_TYPE_INTEGER;
+        input.count = 2;
+        input.pointer = param;
+        status = acpi_evaluate_object(handle, "ACMD", &input, &output);
+        if (ACPI_SUCCESS(status)) {
+                union acpi_object *obj;
+                obj = output.pointer;
+                locs = obj->buffer.pointer;
+                *x = locs[0];
+                *y = locs[1];
+                *z = locs[2];
+                kfree(output.pointer);
+        }
+        return status;
+}
+
+static void cmpc_accel_handler(struct acpi_device *dev, u32 event)
+{
+        if (event == 0x81) {
+                unsigned char x, y, z;
+                acpi_status status;
+
+                status = cmpc_get_accel(dev->handle, &x, &y, &z);
+                if (ACPI_SUCCESS(status)) {
+                        struct input_dev *inputdev = dev_get_drvdata(&dev->dev);
+
+                        input_report_abs(inputdev, ABS_X, x);
+                        input_report_abs(inputdev, ABS_Y, y);
+                        input_report_abs(inputdev, ABS_Z, z);
+                        input_sync(inputdev);
+                }
+        }
+}
+
+static ssize_t cmpc_accel_sensitivity_show(struct device *dev,
+                                           struct device_attribute *attr,
+                                           char *buf)
+{
+        struct acpi_device *acpi;
+        struct input_dev *inputdev;
+        struct cmpc_accel *accel;
+
+        acpi = to_acpi_device(dev);
+        inputdev = dev_get_drvdata(&acpi->dev);
+        accel = dev_get_drvdata(&inputdev->dev);
+
+        return sprintf(buf, "%d\n", accel->sensitivity);
+}
+
+static ssize_t cmpc_accel_sensitivity_store(struct device *dev,
+                                            struct device_attribute *attr,
+                                            const char *buf, size_t count)
+{
+        struct acpi_device *acpi;
+        struct input_dev *inputdev;
+        struct cmpc_accel *accel;
+        unsigned long sensitivity;
+        int r;
+
+        acpi = to_acpi_device(dev);
+        inputdev = dev_get_drvdata(&acpi->dev);
+        accel = dev_get_drvdata(&inputdev->dev);
+
+        r = strict_strtoul(buf, 0, &sensitivity);
+        if (r)
+                return r;
+
+        accel->sensitivity = sensitivity;
+        cmpc_accel_set_sensitivity(acpi->handle, sensitivity);
+
+        return strnlen(buf, count);
+}
+
+struct device_attribute cmpc_accel_sensitivity_attr = {
+        .attr = { .name = "sensitivity", .mode = 0660 },
+        .show = cmpc_accel_sensitivity_show,
+        .store = cmpc_accel_sensitivity_store
+};
+
+static int cmpc_accel_open(struct input_dev *input)
+{
+        struct acpi_device *acpi;
+
+        acpi = to_acpi_device(input->dev.parent);
+        if (ACPI_SUCCESS(cmpc_start_accel(acpi->handle)))
+                return 0;
+        return -EIO;
+}
+
+static void cmpc_accel_close(struct input_dev *input)
+{
+        struct acpi_device *acpi;
+
+        acpi = to_acpi_device(input->dev.parent);
+        cmpc_stop_accel(acpi->handle);
+}
+
+static void cmpc_accel_idev_init(struct input_dev *inputdev)
+{
+        set_bit(EV_ABS, inputdev->evbit);
+        input_set_abs_params(inputdev, ABS_X, 0, 255, 8, 0);
+        input_set_abs_params(inputdev, ABS_Y, 0, 255, 8, 0);
+        input_set_abs_params(inputdev, ABS_Z, 0, 255, 8, 0);
+        inputdev->open = cmpc_accel_open;
+        inputdev->close = cmpc_accel_close;
+}
+
+static int cmpc_accel_add(struct acpi_device *acpi)
+{
+        int error;
+        struct input_dev *inputdev;
+        struct cmpc_accel *accel;
+
+        accel = kmalloc(sizeof(*accel), GFP_KERNEL);
+        if (!accel)
+                return -ENOMEM;
+
+        accel->sensitivity = CMPC_ACCEL_SENSITIVITY_DEFAULT;
+        cmpc_accel_set_sensitivity(acpi->handle, accel->sensitivity);
+
+        error = device_create_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
+        if (error)
+                goto failed_file;
+
+        error = cmpc_add_acpi_notify_device(acpi, "cmpc_accel",
+                                            cmpc_accel_idev_init);
+        if (error)
+                goto failed_input;
+
+        inputdev = dev_get_drvdata(&acpi->dev);
+        dev_set_drvdata(&inputdev->dev, accel);
+
+        return 0;
+
+failed_input:
+        device_remove_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
+failed_file:
+        kfree(accel);
+        return error;
+}
+
+static int cmpc_accel_remove(struct acpi_device *acpi, int type)
+{
+        struct input_dev *inputdev;
+        struct cmpc_accel *accel;
+
+        inputdev = dev_get_drvdata(&acpi->dev);
+        accel = dev_get_drvdata(&inputdev->dev);
+
+        device_remove_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
+        return cmpc_remove_acpi_notify_device(acpi);
+}
+
+static const struct acpi_device_id cmpc_accel_device_ids[] = {
+        {"ACCE0000", 0},
+        {"", 0}
+};
+MODULE_DEVICE_TABLE(acpi, cmpc_accel_device_ids);
+
+static struct acpi_driver cmpc_accel_acpi_driver = {
+        .owner = THIS_MODULE,
+        .name = "cmpc_accel",
+        .class = "cmpc_accel",
+        .ids = cmpc_accel_device_ids,
+        .ops = {
+                .add = cmpc_accel_add,
+                .remove = cmpc_accel_remove,
+                .notify = cmpc_accel_handler,
+        }
+};
+
+
+/*
+ * Tablet mode code.
+ */
+static acpi_status cmpc_get_tablet(acpi_handle handle,
+                                   unsigned long long *value)
+{
+        union acpi_object param;
+        struct acpi_object_list input;
+        unsigned long long output;
+        acpi_status status;
+
+        param.type = ACPI_TYPE_INTEGER;
+        param.integer.value = 0x01;
+        input.count = 1;
+        input.pointer = &param;
+        status = acpi_evaluate_integer(handle, "TCMD", &input, &output);
+        if (ACPI_SUCCESS(status))
+                *value = output;
+        return status;
+}
+
+static void cmpc_tablet_handler(struct acpi_device *dev, u32 event)
+{
+        unsigned long long val = 0;
+        struct input_dev *inputdev = dev_get_drvdata(&dev->dev);
+
+        if (event == 0x81) {
+                if (ACPI_SUCCESS(cmpc_get_tablet(dev->handle, &val)))
+                        input_report_switch(inputdev, SW_TABLET_MODE, !val);
+        }
+}
+
+static void cmpc_tablet_idev_init(struct input_dev *inputdev)
+{
+        unsigned long long val = 0;
+        struct acpi_device *acpi;
+
+        set_bit(EV_SW, inputdev->evbit);
+        set_bit(SW_TABLET_MODE, inputdev->swbit);
+
+        acpi = to_acpi_device(inputdev->dev.parent);
+        if (ACPI_SUCCESS(cmpc_get_tablet(acpi->handle, &val)))
+                input_report_switch(inputdev, SW_TABLET_MODE, !val);
+}
+
+static int cmpc_tablet_add(struct acpi_device *acpi)
+{
+        return cmpc_add_acpi_notify_device(acpi, "cmpc_tablet",
+                                           cmpc_tablet_idev_init);
+}
+
+static int cmpc_tablet_remove(struct acpi_device *acpi, int type)
+{
+        return cmpc_remove_acpi_notify_device(acpi);
+}
+
+static int cmpc_tablet_resume(struct acpi_device *acpi)
+{
+        struct input_dev *inputdev = dev_get_drvdata(&acpi->dev);
+        unsigned long long val = 0;
+        if (ACPI_SUCCESS(cmpc_get_tablet(acpi->handle, &val)))
+                input_report_switch(inputdev, SW_TABLET_MODE, !val);
+        return 0;
+}
+
+static const struct acpi_device_id cmpc_tablet_device_ids[] = {
+        {"TBLT0000", 0},
+        {"", 0}
+};
+MODULE_DEVICE_TABLE(acpi, cmpc_tablet_device_ids);
+
+static struct acpi_driver cmpc_tablet_acpi_driver = {
+        .owner = THIS_MODULE,
+        .name = "cmpc_tablet",
+        .class = "cmpc_tablet",
+        .ids = cmpc_tablet_device_ids,
+        .ops = {
+                .add = cmpc_tablet_add,
+                .remove = cmpc_tablet_remove,
+                .resume = cmpc_tablet_resume,
+                .notify = cmpc_tablet_handler,
+        }
+};
+
+
+/*
+ * Backlight code.
+ */
+
+static acpi_status cmpc_get_brightness(acpi_handle handle,
+                                       unsigned long long *value)
+{
+        union acpi_object param;
+        struct acpi_object_list input;
+        unsigned long long output;
+        acpi_status status;
+
+        param.type = ACPI_TYPE_INTEGER;
+        param.integer.value = 0xC0;
+        input.count = 1;
+        input.pointer = &param;
+        status = acpi_evaluate_integer(handle, "GRDI", &input, &output);
+        if (ACPI_SUCCESS(status))
+                *value = output;
+        return status;
+}
+
+static acpi_status cmpc_set_brightness(acpi_handle handle,
+                                       unsigned long long value)
+{
+        union acpi_object param[2];
+        struct acpi_object_list input;
+        acpi_status status;
+        unsigned long long output;
+
+        param[0].type = ACPI_TYPE_INTEGER;
+        param[0].integer.value = 0xC0;
+        param[1].type = ACPI_TYPE_INTEGER;
+        param[1].integer.value = value;
+        input.count = 2;
+        input.pointer = param;
+        status = acpi_evaluate_integer(handle, "GWRI", &input, &output);
+        return status;
+}
+
+static int cmpc_bl_get_brightness(struct backlight_device *bd)
+{
+        acpi_status status;
+        acpi_handle handle;
+        unsigned long long brightness;
+
+        handle = bl_get_data(bd);
+        status = cmpc_get_brightness(handle, &brightness);
+        if (ACPI_SUCCESS(status))
+                return brightness;
+        else
+                return -1;
+}
+
+static int cmpc_bl_update_status(struct backlight_device *bd)
+{
+        acpi_status status;
+        acpi_handle handle;
+
+        handle = bl_get_data(bd);
+        status = cmpc_set_brightness(handle, bd->props.brightness);
+        if (ACPI_SUCCESS(status))
+                return 0;
+        else
+                return -1;
+}
+
+static struct backlight_ops cmpc_bl_ops = {
+        .get_brightness = cmpc_bl_get_brightness,
+        .update_status = cmpc_bl_update_status
+};
+
+static int cmpc_bl_add(struct acpi_device *acpi)
+{
+        struct backlight_device *bd;
+
+        bd = backlight_device_register("cmpc_bl", &acpi->dev,
+                                       acpi->handle, &cmpc_bl_ops);
+        bd->props.max_brightness = 7;
+        dev_set_drvdata(&acpi->dev, bd);
+        return 0;
+}
+
+static int cmpc_bl_remove(struct acpi_device *acpi, int type)
+{
+        struct backlight_device *bd;
+
+        bd = dev_get_drvdata(&acpi->dev);
+        backlight_device_unregister(bd);
+        return 0;
+}
+
+static const struct acpi_device_id cmpc_device_ids[] = {
+        {"IPML200", 0},
+        {"", 0}
+};
+MODULE_DEVICE_TABLE(acpi, cmpc_device_ids);
+
+static struct acpi_driver cmpc_bl_acpi_driver = {
+        .owner = THIS_MODULE,
+        .name = "cmpc",
+        .class = "cmpc",
+        .ids = cmpc_device_ids,
+        .ops = {
+                .add = cmpc_bl_add,
+                .remove = cmpc_bl_remove
+        }
+};
+
+
+/*
+ * Extra keys code.
+ */
+static int cmpc_keys_codes[] = {
+        KEY_UNKNOWN,
+        KEY_WLAN,
+        KEY_SWITCHVIDEOMODE,
+        KEY_BRIGHTNESSDOWN,
+        KEY_BRIGHTNESSUP,
+        KEY_VENDOR,
+        KEY_MAX
+};
+
+static void cmpc_keys_handler(struct acpi_device *dev, u32 event)
+{
+        struct input_dev *inputdev;
+        int code = KEY_MAX;
+
+        if ((event & 0x0F) < ARRAY_SIZE(cmpc_keys_codes))
+                code = cmpc_keys_codes[event & 0x0F];
+        inputdev = dev_get_drvdata(&dev->dev);;
+        input_report_key(inputdev, code, !(event & 0x10));
+}
+
+static void cmpc_keys_idev_init(struct input_dev *inputdev)
+{
+        int i;
+
+        set_bit(EV_KEY, inputdev->evbit);
+        for (i = 0; cmpc_keys_codes[i] != KEY_MAX; i++)
+                set_bit(cmpc_keys_codes[i], inputdev->keybit);
+}
+
+static int cmpc_keys_add(struct acpi_device *acpi)
+{
+        return cmpc_add_acpi_notify_device(acpi, "cmpc_keys",
+                                           cmpc_keys_idev_init);
+}
+
+static int cmpc_keys_remove(struct acpi_device *acpi, int type)
+{
+        return cmpc_remove_acpi_notify_device(acpi);
+}
+
+static const struct acpi_device_id cmpc_keys_device_ids[] = {
+        {"FnBT0000", 0},
+        {"", 0}
+};
+MODULE_DEVICE_TABLE(acpi, cmpc_keys_device_ids);
+
+static struct acpi_driver cmpc_keys_acpi_driver = {
+        .owner = THIS_MODULE,
+        .name = "cmpc_keys",
+        .class = "cmpc_keys",
+        .ids = cmpc_keys_device_ids,
+        .ops = {
+                .add = cmpc_keys_add,
+                .remove = cmpc_keys_remove,
+                .notify = cmpc_keys_handler,
+        }
+};
+
+
+/*
+ * General init/exit code.
+ */
+
+static int cmpc_init(void)
+{
+        int r;
+
+        r = acpi_bus_register_driver(&cmpc_keys_acpi_driver);
+        if (r)
+                goto failed_keys;
+
+        r = acpi_bus_register_driver(&cmpc_bl_acpi_driver);
+        if (r)
+                goto failed_bl;
+
+        r = acpi_bus_register_driver(&cmpc_tablet_acpi_driver);
+        if (r)
+                goto failed_tablet;
+
+        r = acpi_bus_register_driver(&cmpc_accel_acpi_driver);
+        if (r)
+                goto failed_accel;
+
+        return r;
+
+failed_accel:
+        acpi_bus_unregister_driver(&cmpc_tablet_acpi_driver);
+
+failed_tablet:
+        acpi_bus_unregister_driver(&cmpc_bl_acpi_driver);
+
+failed_bl:
+        acpi_bus_unregister_driver(&cmpc_keys_acpi_driver);
+
+failed_keys:
+        return r;
+}
+
+static void cmpc_exit(void)
+{
+        acpi_bus_unregister_driver(&cmpc_accel_acpi_driver);
+        acpi_bus_unregister_driver(&cmpc_tablet_acpi_driver);
+        acpi_bus_unregister_driver(&cmpc_bl_acpi_driver);
+        acpi_bus_unregister_driver(&cmpc_keys_acpi_driver);
+}
+
+module_init(cmpc_init);
+module_exit(cmpc_exit);