[mirror_ubuntu-artful-kernel.git] / drivers / hid / wacom_sys.c

/*
 * drivers/input/tablet/wacom_sys.c
 *
 *  USB Wacom tablet support - system specific code
 */

/*
 * 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.
 */

#include "wacom_wac.h"
#include "wacom.h"
#include <linux/hid.h>

#define WAC_MSG_RETRIES         5

#define WAC_CMD_LED_CONTROL     0x20
#define WAC_CMD_ICON_START      0x21
#define WAC_CMD_ICON_XFER       0x23
#define WAC_CMD_RETRIES         10

static int wacom_get_report(struct hid_device *hdev, u8 type, u8 id,
                            void *buf, size_t size, unsigned int retries)
{
        int retval;

        do {
                retval = hid_hw_raw_request(hdev, id, buf, size, type,
                                HID_REQ_GET_REPORT);
        } while ((retval == -ETIMEDOUT || retval == -EPIPE) && --retries);

        return retval;
}

static int wacom_set_report(struct hid_device *hdev, u8 type, u8 id,
                            void *buf, size_t size, unsigned int retries)
{
        int retval;

        do {
                retval = hid_hw_raw_request(hdev, id, buf, size, type,
                                HID_REQ_SET_REPORT);
        } while ((retval == -ETIMEDOUT || retval == -EPIPE) && --retries);

        return retval;
}

static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
                u8 *raw_data, int size)
{
        struct wacom *wacom = hid_get_drvdata(hdev);

        if (size > WACOM_PKGLEN_MAX)
                return 1;

        memcpy(wacom->wacom_wac.data, raw_data, size);

        wacom_wac_irq(&wacom->wacom_wac, size);

        return 0;
}

static int wacom_open(struct input_dev *dev)
{
        struct wacom *wacom = input_get_drvdata(dev);
        int retval;

        mutex_lock(&wacom->lock);
        retval = hid_hw_open(wacom->hdev);
        mutex_unlock(&wacom->lock);

        return retval;
}

static void wacom_close(struct input_dev *dev)
{
        struct wacom *wacom = input_get_drvdata(dev);

        mutex_lock(&wacom->lock);
        hid_hw_close(wacom->hdev);
        mutex_unlock(&wacom->lock);
}

/*
 * Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
 */
static int wacom_calc_hid_res(int logical_extents, int physical_extents,
                               unsigned unit, int exponent)
{
        struct hid_field field = {
                .logical_maximum = logical_extents,
                .physical_maximum = physical_extents,
                .unit = unit,
                .unit_exponent = exponent,
        };

        return hidinput_calc_abs_res(&field, ABS_X);
}

static void wacom_feature_mapping(struct hid_device *hdev,
                struct hid_field *field, struct hid_usage *usage)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_features *features = &wacom->wacom_wac.features;

        switch (usage->hid) {
        case HID_DG_CONTACTMAX:
                /* leave touch_max as is if predefined */
                if (!features->touch_max)
                        features->touch_max = field->value[0];
                break;
        }
}

/*
 * Interface Descriptor of wacom devices can be incomplete and
 * inconsistent so wacom_features table is used to store stylus
 * device's packet lengths, various maximum values, and tablet
 * resolution based on product ID's.
 *
 * For devices that contain 2 interfaces, wacom_features table is
 * inaccurate for the touch interface.  Since the Interface Descriptor
 * for touch interfaces has pretty complete data, this function exists
 * to query tablet for this missing information instead of hard coding in
 * an additional table.
 *
 * A typical Interface Descriptor for a stylus will contain a
 * boot mouse application collection that is not of interest and this
 * function will ignore it.
 *
 * It also contains a digitizer application collection that also is not
 * of interest since any information it contains would be duplicate
 * of what is in wacom_features. Usually it defines a report of an array
 * of bytes that could be used as max length of the stylus packet returned.
 * If it happens to define a Digitizer-Stylus Physical Collection then
 * the X and Y logical values contain valid data but it is ignored.
 *
 * A typical Interface Descriptor for a touch interface will contain a
 * Digitizer-Finger Physical Collection which will define both logical
 * X/Y maximum as well as the physical size of tablet. Since touch
 * interfaces haven't supported pressure or distance, this is enough
 * information to override invalid values in the wacom_features table.
 *
 * Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
 * data. We deal with them after returning from this function.
 */
static void wacom_usage_mapping(struct hid_device *hdev,
                struct hid_field *field, struct hid_usage *usage)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_features *features = &wacom->wacom_wac.features;
        bool finger = (field->logical == HID_DG_FINGER) ||
                      (field->physical == HID_DG_FINGER);
        bool pen = (field->logical == HID_DG_STYLUS) ||
                   (field->physical == HID_DG_STYLUS);

        /*
        * Requiring Stylus Usage will ignore boot mouse
        * X/Y values and some cases of invalid Digitizer X/Y
        * values commonly reported.
        */
        if (!pen && !finger)
                return;

        if (finger && !features->touch_max)
                /* touch device at least supports one touch point */
                features->touch_max = 1;

        switch (usage->hid) {
        case HID_GD_X:
                features->x_max = field->logical_maximum;
                if (finger) {
                        features->device_type = BTN_TOOL_FINGER;
                        features->x_phy = field->physical_maximum;
                        if (features->type != BAMBOO_PT) {
                                features->unit = field->unit;
                                features->unitExpo = field->unit_exponent;
                        }
                } else {
                        features->device_type = BTN_TOOL_PEN;
                }
                break;
        case HID_GD_Y:
                features->y_max = field->logical_maximum;
                if (finger) {
                        features->y_phy = field->physical_maximum;
                        if (features->type != BAMBOO_PT) {
                                features->unit = field->unit;
                                features->unitExpo = field->unit_exponent;
                        }
                }
                break;
        case HID_DG_TIPPRESSURE:
                if (pen)
                        features->pressure_max = field->logical_maximum;
                break;
        }
}

static void wacom_parse_hid(struct hid_device *hdev,
                           struct wacom_features *features)
{
        struct hid_report_enum *rep_enum;
        struct hid_report *hreport;
        int i, j;

        /* check features first */
        rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
        list_for_each_entry(hreport, &rep_enum->report_list, list) {
                for (i = 0; i < hreport->maxfield; i++) {
                        /* Ignore if report count is out of bounds. */
                        if (hreport->field[i]->report_count < 1)
                                continue;

                        for (j = 0; j < hreport->field[i]->maxusage; j++) {
                                wacom_feature_mapping(hdev, hreport->field[i],
                                                hreport->field[i]->usage + j);
                        }
                }
        }

        /* now check the input usages */
        rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
        list_for_each_entry(hreport, &rep_enum->report_list, list) {

                if (!hreport->maxfield)
                        continue;

                for (i = 0; i < hreport->maxfield; i++)
                        for (j = 0; j < hreport->field[i]->maxusage; j++)
                                wacom_usage_mapping(hdev, hreport->field[i],
                                                hreport->field[i]->usage + j);
        }
}

static int wacom_set_device_mode(struct hid_device *hdev, int report_id,
                int length, int mode)
{
        unsigned char *rep_data;
        int error = -ENOMEM, limit = 0;

        rep_data = kzalloc(length, GFP_KERNEL);
        if (!rep_data)
                return error;

        do {
                rep_data[0] = report_id;
                rep_data[1] = mode;

                error = wacom_set_report(hdev, HID_FEATURE_REPORT,
                                         report_id, rep_data, length, 1);
                if (error >= 0)
                        error = wacom_get_report(hdev, HID_FEATURE_REPORT,
                                                 report_id, rep_data, length, 1);
        } while ((error < 0 || rep_data[1] != mode) && limit++ < WAC_MSG_RETRIES);

        kfree(rep_data);

        return error < 0 ? error : 0;
}

/*
 * Switch the tablet into its most-capable mode. Wacom tablets are
 * typically configured to power-up in a mode which sends mouse-like
 * reports to the OS. To get absolute position, pressure data, etc.
 * from the tablet, it is necessary to switch the tablet out of this
 * mode and into one which sends the full range of tablet data.
 */
static int wacom_query_tablet_data(struct hid_device *hdev,
                struct wacom_features *features)
{
        if (features->device_type == BTN_TOOL_FINGER) {
                if (features->type > TABLETPC) {
                        /* MT Tablet PC touch */
                        return wacom_set_device_mode(hdev, 3, 4, 4);
                }
                else if (features->type == WACOM_24HDT || features->type == CINTIQ_HYBRID) {
                        return wacom_set_device_mode(hdev, 18, 3, 2);
                }
        } else if (features->device_type == BTN_TOOL_PEN) {
                if (features->type <= BAMBOO_PT && features->type != WIRELESS) {
                        return wacom_set_device_mode(hdev, 2, 2, 2);
                }
        }

        return 0;
}

static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
                                         struct wacom_features *features)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct usb_interface *intf = wacom->intf;

        /* default features */
        features->device_type = BTN_TOOL_PEN;
        features->x_fuzz = 4;
        features->y_fuzz = 4;
        features->pressure_fuzz = 0;
        features->distance_fuzz = 0;

        /*
         * The wireless device HID is basic and layout conflicts with
         * other tablets (monitor and touch interface can look like pen).
         * Skip the query for this type and modify defaults based on
         * interface number.
         */
        if (features->type == WIRELESS) {
                if (intf->cur_altsetting->desc.bInterfaceNumber == 0) {
                        features->device_type = 0;
                } else if (intf->cur_altsetting->desc.bInterfaceNumber == 2) {
                        features->device_type = BTN_TOOL_FINGER;
                        features->pktlen = WACOM_PKGLEN_BBTOUCH3;
                }
        }

        /* only devices that support touch need to retrieve the info */
        if (features->type < BAMBOO_PT)
                return;

        wacom_parse_hid(hdev, features);
}

struct wacom_hdev_data {
        struct list_head list;
        struct kref kref;
        struct hid_device *dev;
        struct wacom_shared shared;
};

static LIST_HEAD(wacom_udev_list);
static DEFINE_MUTEX(wacom_udev_list_lock);

static bool wacom_are_sibling(struct hid_device *hdev,
                struct hid_device *sibling)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_features *features = &wacom->wacom_wac.features;
        int vid = features->oVid;
        int pid = features->oPid;
        int n1,n2;

        if (vid == 0 && pid == 0) {
                vid = hdev->vendor;
                pid = hdev->product;
        }

        if (vid != sibling->vendor || pid != sibling->product)
                return false;

        /* Compare the physical path. */
        n1 = strrchr(hdev->phys, '.') - hdev->phys;
        n2 = strrchr(sibling->phys, '.') - sibling->phys;
        if (n1 != n2 || n1 <= 0 || n2 <= 0)
                return false;

        return !strncmp(hdev->phys, sibling->phys, n1);
}

static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
{
        struct wacom_hdev_data *data;

        list_for_each_entry(data, &wacom_udev_list, list) {
                if (wacom_are_sibling(hdev, data->dev)) {
                        kref_get(&data->kref);
                        return data;
                }
        }

        return NULL;
}

static int wacom_add_shared_data(struct hid_device *hdev)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct wacom_hdev_data *data;
        int retval = 0;

        mutex_lock(&wacom_udev_list_lock);

        data = wacom_get_hdev_data(hdev);
        if (!data) {
                data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
                if (!data) {
                        retval = -ENOMEM;
                        goto out;
                }

                kref_init(&data->kref);
                data->dev = hdev;
                list_add_tail(&data->list, &wacom_udev_list);
        }

        wacom_wac->shared = &data->shared;

out:
        mutex_unlock(&wacom_udev_list_lock);
        return retval;
}

static void wacom_release_shared_data(struct kref *kref)
{
        struct wacom_hdev_data *data =
                container_of(kref, struct wacom_hdev_data, kref);

        mutex_lock(&wacom_udev_list_lock);
        list_del(&data->list);
        mutex_unlock(&wacom_udev_list_lock);

        kfree(data);
}

static void wacom_remove_shared_data(struct wacom_wac *wacom)
{
        struct wacom_hdev_data *data;

        if (wacom->shared) {
                data = container_of(wacom->shared, struct wacom_hdev_data, shared);
                kref_put(&data->kref, wacom_release_shared_data);
                wacom->shared = NULL;
        }
}

static int wacom_led_control(struct wacom *wacom)
{
        unsigned char *buf;
        int retval;

        buf = kzalloc(9, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        if (wacom->wacom_wac.features.type >= INTUOS5S &&
            wacom->wacom_wac.features.type <= INTUOSPL) {
                /*
                 * Touch Ring and crop mark LED luminance may take on
                 * one of four values:
                 *    0 = Low; 1 = Medium; 2 = High; 3 = Off
                 */
                int ring_led = wacom->led.select[0] & 0x03;
                int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
                int crop_lum = 0;

                buf[0] = WAC_CMD_LED_CONTROL;
                buf[1] = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
        }
        else {
                int led = wacom->led.select[0] | 0x4;

                if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
                    wacom->wacom_wac.features.type == WACOM_24HD)
                        led |= (wacom->led.select[1] << 4) | 0x40;

                buf[0] = WAC_CMD_LED_CONTROL;
                buf[1] = led;
                buf[2] = wacom->led.llv;
                buf[3] = wacom->led.hlv;
                buf[4] = wacom->led.img_lum;
        }

        retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
                                  WAC_CMD_LED_CONTROL, buf, 9, WAC_CMD_RETRIES);
        kfree(buf);

        return retval;
}

static int wacom_led_putimage(struct wacom *wacom, int button_id, const void *img)
{
        unsigned char *buf;
        int i, retval;

        buf = kzalloc(259, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        /* Send 'start' command */
        buf[0] = WAC_CMD_ICON_START;
        buf[1] = 1;
        retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
                                  WAC_CMD_ICON_START, buf, 2, WAC_CMD_RETRIES);
        if (retval < 0)
                goto out;

        buf[0] = WAC_CMD_ICON_XFER;
        buf[1] = button_id & 0x07;
        for (i = 0; i < 4; i++) {
                buf[2] = i;
                memcpy(buf + 3, img + i * 256, 256);

                retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
                                          WAC_CMD_ICON_XFER,
                                          buf, 259, WAC_CMD_RETRIES);
                if (retval < 0)
                        break;
        }

        /* Send 'stop' */
        buf[0] = WAC_CMD_ICON_START;
        buf[1] = 0;
        wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, WAC_CMD_ICON_START,
                         buf, 2, WAC_CMD_RETRIES);

out:
        kfree(buf);
        return retval;
}

static ssize_t wacom_led_select_store(struct device *dev, int set_id,
                                      const char *buf, size_t count)
{
        struct hid_device *hdev = container_of(dev, struct hid_device, dev);
        struct wacom *wacom = hid_get_drvdata(hdev);
        unsigned int id;
        int err;

        err = kstrtouint(buf, 10, &id);
        if (err)
                return err;

        mutex_lock(&wacom->lock);

        wacom->led.select[set_id] = id & 0x3;
        err = wacom_led_control(wacom);

        mutex_unlock(&wacom->lock);

        return err < 0 ? err : count;
}

#define DEVICE_LED_SELECT_ATTR(SET_ID)                                  \
static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,     \
        struct device_attribute *attr, const char *buf, size_t count)   \
{                                                                       \
        return wacom_led_select_store(dev, SET_ID, buf, count);         \
}                                                                       \
static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,      \
        struct device_attribute *attr, char *buf)                       \
{                                                                       \
        struct hid_device *hdev = container_of(dev, struct hid_device, dev);\
        struct wacom *wacom = hid_get_drvdata(hdev);                    \
        return snprintf(buf, 2, "%d\n", wacom->led.select[SET_ID]);     \
}                                                                       \
static DEVICE_ATTR(status_led##SET_ID##_select, S_IWUSR | S_IRUSR,      \
                    wacom_led##SET_ID##_select_show,                    \
                    wacom_led##SET_ID##_select_store)

DEVICE_LED_SELECT_ATTR(0);
DEVICE_LED_SELECT_ATTR(1);

static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
                                     const char *buf, size_t count)
{
        unsigned int value;
        int err;

        err = kstrtouint(buf, 10, &value);
        if (err)
                return err;

        mutex_lock(&wacom->lock);

        *dest = value & 0x7f;
        err = wacom_led_control(wacom);

        mutex_unlock(&wacom->lock);

        return err < 0 ? err : count;
}

#define DEVICE_LUMINANCE_ATTR(name, field)                              \
static ssize_t wacom_##name##_luminance_store(struct device *dev,       \
        struct device_attribute *attr, const char *buf, size_t count)   \
{                                                                       \
        struct hid_device *hdev = container_of(dev, struct hid_device, dev);\
        struct wacom *wacom = hid_get_drvdata(hdev);                    \
                                                                        \
        return wacom_luminance_store(wacom, &wacom->led.field,          \
                                     buf, count);                       \
}                                                                       \
static DEVICE_ATTR(name##_luminance, S_IWUSR,                           \
                   NULL, wacom_##name##_luminance_store)

DEVICE_LUMINANCE_ATTR(status0, llv);
DEVICE_LUMINANCE_ATTR(status1, hlv);
DEVICE_LUMINANCE_ATTR(buttons, img_lum);

static ssize_t wacom_button_image_store(struct device *dev, int button_id,
                                        const char *buf, size_t count)
{
        struct hid_device *hdev = container_of(dev, struct hid_device, dev);
        struct wacom *wacom = hid_get_drvdata(hdev);
        int err;

        if (count != 1024)
                return -EINVAL;

        mutex_lock(&wacom->lock);

        err = wacom_led_putimage(wacom, button_id, buf);

        mutex_unlock(&wacom->lock);

        return err < 0 ? err : count;
}

#define DEVICE_BTNIMG_ATTR(BUTTON_ID)                                   \
static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,      \
        struct device_attribute *attr, const char *buf, size_t count)   \
{                                                                       \
        return wacom_button_image_store(dev, BUTTON_ID, buf, count);    \
}                                                                       \
static DEVICE_ATTR(button##BUTTON_ID##_rawimg, S_IWUSR,                 \
                   NULL, wacom_btnimg##BUTTON_ID##_store)

DEVICE_BTNIMG_ATTR(0);
DEVICE_BTNIMG_ATTR(1);
DEVICE_BTNIMG_ATTR(2);
DEVICE_BTNIMG_ATTR(3);
DEVICE_BTNIMG_ATTR(4);
DEVICE_BTNIMG_ATTR(5);
DEVICE_BTNIMG_ATTR(6);
DEVICE_BTNIMG_ATTR(7);

static struct attribute *cintiq_led_attrs[] = {
        &dev_attr_status_led0_select.attr,
        &dev_attr_status_led1_select.attr,
        NULL
};

static struct attribute_group cintiq_led_attr_group = {
        .name = "wacom_led",
        .attrs = cintiq_led_attrs,
};

static struct attribute *intuos4_led_attrs[] = {
        &dev_attr_status0_luminance.attr,
        &dev_attr_status1_luminance.attr,
        &dev_attr_status_led0_select.attr,
        &dev_attr_buttons_luminance.attr,
        &dev_attr_button0_rawimg.attr,
        &dev_attr_button1_rawimg.attr,
        &dev_attr_button2_rawimg.attr,
        &dev_attr_button3_rawimg.attr,
        &dev_attr_button4_rawimg.attr,
        &dev_attr_button5_rawimg.attr,
        &dev_attr_button6_rawimg.attr,
        &dev_attr_button7_rawimg.attr,
        NULL
};

static struct attribute_group intuos4_led_attr_group = {
        .name = "wacom_led",
        .attrs = intuos4_led_attrs,
};

static struct attribute *intuos5_led_attrs[] = {
        &dev_attr_status0_luminance.attr,
        &dev_attr_status_led0_select.attr,
        NULL
};

static struct attribute_group intuos5_led_attr_group = {
        .name = "wacom_led",
        .attrs = intuos5_led_attrs,
};

static int wacom_initialize_leds(struct wacom *wacom)
{
        int error;

        /* Initialize default values */
        switch (wacom->wacom_wac.features.type) {
        case INTUOS4S:
        case INTUOS4:
        case INTUOS4L:
                wacom->led.select[0] = 0;
                wacom->led.select[1] = 0;
                wacom->led.llv = 10;
                wacom->led.hlv = 20;
                wacom->led.img_lum = 10;
                error = sysfs_create_group(&wacom->hdev->dev.kobj,
                                           &intuos4_led_attr_group);
                break;

        case WACOM_24HD:
        case WACOM_21UX2:
                wacom->led.select[0] = 0;
                wacom->led.select[1] = 0;
                wacom->led.llv = 0;
                wacom->led.hlv = 0;
                wacom->led.img_lum = 0;

                error = sysfs_create_group(&wacom->hdev->dev.kobj,
                                           &cintiq_led_attr_group);
                break;

        case INTUOS5S:
        case INTUOS5:
        case INTUOS5L:
        case INTUOSPS:
        case INTUOSPM:
        case INTUOSPL:
                if (wacom->wacom_wac.features.device_type == BTN_TOOL_PEN) {
                        wacom->led.select[0] = 0;
                        wacom->led.select[1] = 0;
                        wacom->led.llv = 32;
                        wacom->led.hlv = 0;
                        wacom->led.img_lum = 0;

                        error = sysfs_create_group(&wacom->hdev->dev.kobj,
                                                  &intuos5_led_attr_group);
                } else
                        return 0;
                break;

        default:
                return 0;
        }

        if (error) {
                hid_err(wacom->hdev,
                        "cannot create sysfs group err: %d\n", error);
                return error;
        }
        wacom_led_control(wacom);
        wacom->led_initialized = true;

        return 0;
}

static void wacom_destroy_leds(struct wacom *wacom)
{
        if (!wacom->led_initialized)
                return;

        wacom->led_initialized = false;

        switch (wacom->wacom_wac.features.type) {
        case INTUOS4S:
        case INTUOS4:
        case INTUOS4L:
                sysfs_remove_group(&wacom->hdev->dev.kobj,
                                   &intuos4_led_attr_group);
                break;

        case WACOM_24HD:
        case WACOM_21UX2:
                sysfs_remove_group(&wacom->hdev->dev.kobj,
                                   &cintiq_led_attr_group);
                break;

        case INTUOS5S:
        case INTUOS5:
        case INTUOS5L:
        case INTUOSPS:
        case INTUOSPM:
        case INTUOSPL:
                if (wacom->wacom_wac.features.device_type == BTN_TOOL_PEN)
                        sysfs_remove_group(&wacom->hdev->dev.kobj,
                                           &intuos5_led_attr_group);
                break;
        }
}

static enum power_supply_property wacom_battery_props[] = {
        POWER_SUPPLY_PROP_STATUS,
        POWER_SUPPLY_PROP_SCOPE,
        POWER_SUPPLY_PROP_CAPACITY
};

static int wacom_battery_get_property(struct power_supply *psy,
                                      enum power_supply_property psp,
                                      union power_supply_propval *val)
{
        struct wacom *wacom = container_of(psy, struct wacom, battery);
        int ret = 0;

        switch (psp) {
                case POWER_SUPPLY_PROP_SCOPE:
                        val->intval = POWER_SUPPLY_SCOPE_DEVICE;
                        break;
                case POWER_SUPPLY_PROP_CAPACITY:
                        val->intval =
                                wacom->wacom_wac.battery_capacity;
                        break;
                case POWER_SUPPLY_PROP_STATUS:
                        if (wacom->wacom_wac.bat_charging)
                                val->intval = POWER_SUPPLY_STATUS_CHARGING;
                        else if (wacom->wacom_wac.battery_capacity == 100 &&
                                    wacom->wacom_wac.ps_connected)
                                val->intval = POWER_SUPPLY_STATUS_FULL;
                        else
                                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
                        break;
                default:
                        ret = -EINVAL;
                        break;
        }

        return ret;
}

static int wacom_initialize_battery(struct wacom *wacom)
{
        int error = 0;

        if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) {
                wacom->battery.properties = wacom_battery_props;
                wacom->battery.num_properties = ARRAY_SIZE(wacom_battery_props);
                wacom->battery.get_property = wacom_battery_get_property;
                wacom->battery.name = "wacom_battery";
                wacom->battery.type = POWER_SUPPLY_TYPE_BATTERY;
                wacom->battery.use_for_apm = 0;

                error = power_supply_register(&wacom->hdev->dev,
                                              &wacom->battery);

                if (!error)
                        power_supply_powers(&wacom->battery,
                                            &wacom->hdev->dev);
        }

        return error;
}

static void wacom_destroy_battery(struct wacom *wacom)
{
        if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
             wacom->battery.dev) {
                power_supply_unregister(&wacom->battery);
                wacom->battery.dev = NULL;
        }
}

static struct input_dev *wacom_allocate_input(struct wacom *wacom)
{
        struct input_dev *input_dev;
        struct hid_device *hdev = wacom->hdev;
        struct wacom_wac *wacom_wac = &(wacom->wacom_wac);

        input_dev = input_allocate_device();
        if (!input_dev)
                return NULL;

        input_dev->name = wacom_wac->name;
        input_dev->phys = hdev->phys;
        input_dev->dev.parent = &hdev->dev;
        input_dev->open = wacom_open;
        input_dev->close = wacom_close;
        input_dev->uniq = hdev->uniq;
        input_dev->id.bustype = hdev->bus;
        input_dev->id.vendor  = hdev->vendor;
        input_dev->id.product = hdev->product;
        input_dev->id.version = hdev->version;
        input_set_drvdata(input_dev, wacom);

        return input_dev;
}

static void wacom_unregister_inputs(struct wacom *wacom)
{
        if (wacom->wacom_wac.input)
                input_unregister_device(wacom->wacom_wac.input);
        if (wacom->wacom_wac.pad_input)
                input_unregister_device(wacom->wacom_wac.pad_input);
        wacom->wacom_wac.input = NULL;
        wacom->wacom_wac.pad_input = NULL;
}

static int wacom_register_inputs(struct wacom *wacom)
{
        struct input_dev *input_dev, *pad_input_dev;
        struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
        int error;

        input_dev = wacom_allocate_input(wacom);
        pad_input_dev = wacom_allocate_input(wacom);
        if (!input_dev || !pad_input_dev) {
                error = -ENOMEM;
                goto fail1;
        }

        wacom_wac->input = input_dev;
        wacom_wac->pad_input = pad_input_dev;
        wacom_wac->pad_input->name = wacom_wac->pad_name;

        error = wacom_setup_input_capabilities(input_dev, wacom_wac);
        if (error)
                goto fail2;

        error = input_register_device(input_dev);
        if (error)
                goto fail2;

        error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
        if (error) {
                /* no pad in use on this interface */
                input_free_device(pad_input_dev);
                wacom_wac->pad_input = NULL;
                pad_input_dev = NULL;
        } else {
                error = input_register_device(pad_input_dev);
                if (error)
                        goto fail3;
        }

        return 0;

fail3:
        input_unregister_device(input_dev);
        input_dev = NULL;
fail2:
        wacom_wac->input = NULL;
        wacom_wac->pad_input = NULL;
fail1:
        if (input_dev)
                input_free_device(input_dev);
        if (pad_input_dev)
                input_free_device(pad_input_dev);
        return error;
}

static void wacom_wireless_work(struct work_struct *work)
{
        struct wacom *wacom = container_of(work, struct wacom, work);
        struct usb_device *usbdev = wacom->usbdev;
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct hid_device *hdev1, *hdev2;
        struct wacom *wacom1, *wacom2;
        struct wacom_wac *wacom_wac1, *wacom_wac2;
        int error;

        /*
         * Regardless if this is a disconnect or a new tablet,
         * remove any existing input and battery devices.
         */

        wacom_destroy_battery(wacom);

        /* Stylus interface */
        hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
        wacom1 = hid_get_drvdata(hdev1);
        wacom_wac1 = &(wacom1->wacom_wac);
        wacom_unregister_inputs(wacom1);

        /* Touch interface */
        hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
        wacom2 = hid_get_drvdata(hdev2);
        wacom_wac2 = &(wacom2->wacom_wac);
        wacom_unregister_inputs(wacom2);

        if (wacom_wac->pid == 0) {
                hid_info(wacom->hdev, "wireless tablet disconnected\n");
                wacom_wac1->shared->type = 0;
        } else {
                const struct hid_device_id *id = wacom_ids;

                hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
                         wacom_wac->pid);

                while (id->bus) {
                        if (id->vendor == USB_VENDOR_ID_WACOM &&
                            id->product == wacom_wac->pid)
                                break;
                        id++;
                }

                if (!id->bus) {
                        hid_info(wacom->hdev, "ignoring unknown PID.\n");
                        return;
                }

                /* Stylus interface */
                wacom_wac1->features =
                        *((struct wacom_features *)id->driver_data);
                wacom_wac1->features.device_type = BTN_TOOL_PEN;
                snprintf(wacom_wac1->name, WACOM_NAME_MAX, "%s (WL) Pen",
                         wacom_wac1->features.name);
                snprintf(wacom_wac1->pad_name, WACOM_NAME_MAX, "%s (WL) Pad",
                         wacom_wac1->features.name);
                wacom_wac1->shared->touch_max = wacom_wac1->features.touch_max;
                wacom_wac1->shared->type = wacom_wac1->features.type;
                error = wacom_register_inputs(wacom1);
                if (error)
                        goto fail;

                /* Touch interface */
                if (wacom_wac1->features.touch_max ||
                    wacom_wac1->features.type == INTUOSHT) {
                        wacom_wac2->features =
                                *((struct wacom_features *)id->driver_data);
                        wacom_wac2->features.pktlen = WACOM_PKGLEN_BBTOUCH3;
                        wacom_wac2->features.device_type = BTN_TOOL_FINGER;
                        wacom_wac2->features.x_max = wacom_wac2->features.y_max = 4096;
                        if (wacom_wac2->features.touch_max)
                                snprintf(wacom_wac2->name, WACOM_NAME_MAX,
                                         "%s (WL) Finger",wacom_wac2->features.name);
                        else
                                snprintf(wacom_wac2->name, WACOM_NAME_MAX,
                                         "%s (WL) Pad",wacom_wac2->features.name);
                        snprintf(wacom_wac2->pad_name, WACOM_NAME_MAX,
                                 "%s (WL) Pad", wacom_wac2->features.name);
                        error = wacom_register_inputs(wacom2);
                        if (error)
                                goto fail;

                        if (wacom_wac1->features.type == INTUOSHT &&
                            wacom_wac1->features.touch_max)
                                wacom_wac->shared->touch_input = wacom_wac2->input;
                }

                error = wacom_initialize_battery(wacom);
                if (error)
                        goto fail;
        }

        return;

fail:
        wacom_unregister_inputs(wacom1);
        wacom_unregister_inputs(wacom2);
        return;
}

/*
 * Not all devices report physical dimensions from HID.
 * Compute the default from hardcoded logical dimension
 * and resolution before driver overwrites them.
 */
static void wacom_set_default_phy(struct wacom_features *features)
{
        if (features->x_resolution) {
                features->x_phy = (features->x_max * 100) /
                                        features->x_resolution;
                features->y_phy = (features->y_max * 100) /
                                        features->y_resolution;
        }
}

static void wacom_calculate_res(struct wacom_features *features)
{
        features->x_resolution = wacom_calc_hid_res(features->x_max,
                                                    features->x_phy,
                                                    features->unit,
                                                    features->unitExpo);
        features->y_resolution = wacom_calc_hid_res(features->y_max,
                                                    features->y_phy,
                                                    features->unit,
                                                    features->unitExpo);
}

static int wacom_hid_report_len(struct hid_report *report)
{
        /* equivalent to DIV_ROUND_UP(report->size, 8) + !!(report->id > 0) */
        return ((report->size - 1) >> 3) + 1 + (report->id > 0);
}

static size_t wacom_compute_pktlen(struct hid_device *hdev)
{
        struct hid_report_enum *report_enum;
        struct hid_report *report;
        size_t size = 0;

        report_enum = hdev->report_enum + HID_INPUT_REPORT;

        list_for_each_entry(report, &report_enum->report_list, list) {
                size_t report_size = wacom_hid_report_len(report);
                if (report_size > size)
                        size = report_size;
        }

        return size;
}

static int wacom_probe(struct hid_device *hdev,
                const struct hid_device_id *id)
{
        struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
        struct usb_device *dev = interface_to_usbdev(intf);
        struct wacom *wacom;
        struct wacom_wac *wacom_wac;
        struct wacom_features *features;
        int error;

        if (!id->driver_data)
                return -EINVAL;

        wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
        if (!wacom)
                return -ENOMEM;

        hid_set_drvdata(hdev, wacom);
        wacom->hdev = hdev;

        /* ask for the report descriptor to be loaded by HID */
        error = hid_parse(hdev);
        if (error) {
                hid_err(hdev, "parse failed\n");
                goto fail1;
        }

        wacom_wac = &wacom->wacom_wac;
        wacom_wac->features = *((struct wacom_features *)id->driver_data);
        features = &wacom_wac->features;
        features->pktlen = wacom_compute_pktlen(hdev);
        if (features->pktlen > WACOM_PKGLEN_MAX) {
                error = -EINVAL;
                goto fail1;
        }

        if (features->check_for_hid_type && features->hid_type != hdev->type) {
                error = -ENODEV;
                goto fail1;
        }

        wacom->usbdev = dev;
        wacom->intf = intf;
        mutex_init(&wacom->lock);
        INIT_WORK(&wacom->work, wacom_wireless_work);

        /* set the default size in case we do not get them from hid */
        wacom_set_default_phy(features);

        /* Retrieve the physical and logical size for touch devices */
        wacom_retrieve_hid_descriptor(hdev, features);

        /*
         * Intuos5 has no useful data about its touch interface in its
         * HID descriptor. If this is the touch interface (PacketSize
         * of WACOM_PKGLEN_BBTOUCH3), override the table values.
         */
        if (features->type >= INTUOS5S && features->type <= INTUOSHT) {
                if (features->pktlen == WACOM_PKGLEN_BBTOUCH3) {
                        features->device_type = BTN_TOOL_FINGER;

                        features->x_max = 4096;
                        features->y_max = 4096;
                } else {
                        features->device_type = BTN_TOOL_PEN;
                }
        }

        /*
         * Same thing for Bamboo 3rd gen.
         */
        if ((features->type == BAMBOO_PT) &&
            (features->pktlen == WACOM_PKGLEN_BBTOUCH3) &&
            (features->device_type == BTN_TOOL_PEN)) {
                features->device_type = BTN_TOOL_FINGER;

                features->x_max = 4096;
                features->y_max = 4096;
        }

        wacom_setup_device_quirks(features);

        /* set unit to "100th of a mm" for devices not reported by HID */
        if (!features->unit) {
                features->unit = 0x11;
                features->unitExpo = -3;
        }
        wacom_calculate_res(features);

        strlcpy(wacom_wac->name, features->name, sizeof(wacom_wac->name));
        snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
                "%s Pad", features->name);

        if (features->quirks & WACOM_QUIRK_MULTI_INPUT) {
                /* Append the device type to the name */
                if (features->device_type != BTN_TOOL_FINGER)
                        strlcat(wacom_wac->name, " Pen", WACOM_NAME_MAX);
                else if (features->touch_max)
                        strlcat(wacom_wac->name, " Finger", WACOM_NAME_MAX);
                else
                        strlcat(wacom_wac->name, " Pad", WACOM_NAME_MAX);

                error = wacom_add_shared_data(hdev);
                if (error)
                        goto fail1;
        }

        error = wacom_initialize_leds(wacom);
        if (error)
                goto fail2;

        if (!(features->quirks & WACOM_QUIRK_NO_INPUT)) {
                error = wacom_register_inputs(wacom);
                if (error)
                        goto fail3;
        }

        /* Note that if query fails it is not a hard failure */
        wacom_query_tablet_data(hdev, features);

        /* Regular HID work starts now */
        error = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
        if (error) {
                hid_err(hdev, "hw start failed\n");
                goto fail4;
        }

        if (features->quirks & WACOM_QUIRK_MONITOR)
                error = hid_hw_open(hdev);

        if (wacom_wac->features.type == INTUOSHT && wacom_wac->features.touch_max) {
                if (wacom_wac->features.device_type == BTN_TOOL_FINGER)
                        wacom_wac->shared->touch_input = wacom_wac->input;
        }

        return 0;

 fail4: wacom_unregister_inputs(wacom);
 fail3: wacom_destroy_leds(wacom);
 fail2: wacom_remove_shared_data(wacom_wac);
 fail1: kfree(wacom);
        hid_set_drvdata(hdev, NULL);
        return error;
}

static void wacom_remove(struct hid_device *hdev)
{
        struct wacom *wacom = hid_get_drvdata(hdev);

        hid_hw_stop(hdev);

        cancel_work_sync(&wacom->work);
        wacom_unregister_inputs(wacom);
        wacom_destroy_battery(wacom);
        wacom_destroy_leds(wacom);
        wacom_remove_shared_data(&wacom->wacom_wac);

        hid_set_drvdata(hdev, NULL);
        kfree(wacom);
}

static int wacom_resume(struct hid_device *hdev)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_features *features = &wacom->wacom_wac.features;

        mutex_lock(&wacom->lock);

        /* switch to wacom mode first */
        wacom_query_tablet_data(hdev, features);
        wacom_led_control(wacom);

        mutex_unlock(&wacom->lock);

        return 0;
}

static int wacom_reset_resume(struct hid_device *hdev)
{
        return wacom_resume(hdev);
}

static struct hid_driver wacom_driver = {
        .name =         "wacom",
        .id_table =     wacom_ids,
        .probe =        wacom_probe,
        .remove =       wacom_remove,
#ifdef CONFIG_PM
        .resume =       wacom_resume,
        .reset_resume = wacom_reset_resume,
#endif
        .raw_event =    wacom_raw_event,
};
module_hid_driver(wacom_driver);