source: mainline/uspace/drv/bus/usb/usbhid/multimedia/multimedia.c@ af8c9b54

/*
 * Copyright (c) 2011 Lubos Slovak, Vojtech Horky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup drvusbhid
 * @{
 */
/**
 * @file
 * USB Keyboard multimedia keys subdriver.
 */


#include "multimedia.h"
#include "../usbhid.h"
#include "keymap.h"

#include <usb/hid/hidparser.h>
#include <usb/debug.h>
#include <usb/hid/usages/core.h>
#include <usb/hid/usages/consumer.h>

#include <errno.h>
#include <async.h>
#include <str_error.h>

#include <ipc/kbdev.h>
#include <io/console.h>

#define NAME  "multimedia-keys"

/*----------------------------------------------------------------------------*/
/**
 * Logitech UltraX device type.
 */
typedef struct usb_multimedia_t {
        /** Previously pressed keys (not translated to key codes). */
        //int32_t *keys_old;
        /** Currently pressed keys (not translated to key codes). */
        //int32_t *keys;
        /** Count of stored keys (i.e. number of keys in the report). */
        //size_t key_count;
        /** IPC session to the console device (for sending key events). */
        async_sess_t *console_sess;
        /** DDF function */
        ddf_fun_t *fun;
} usb_multimedia_t;


/*----------------------------------------------------------------------------*/
/** 
 * Default handler for IPC methods not handled by DDF.
 *
 * Currently recognizes only one method (IPC_M_CONNECT_TO_ME), in which case it
 * assumes the caller is the console and thus it stores IPC session to it for
 * later use by the driver to notify about key events.
 *
 * @param fun Device function handling the call.
 * @param icallid Call id.
 * @param icall Call data.
 */
static void default_connection_handler(ddf_fun_t *fun,
    ipc_callid_t icallid, ipc_call_t *icall)
{
        usb_log_debug(NAME " default_connection_handler()\n");

        usb_multimedia_t *multim_dev = (usb_multimedia_t *)fun->driver_data;

        if (multim_dev == NULL) {
                async_answer_0(icallid, EINVAL);
                return;
        }

        async_sess_t *sess =
            async_callback_receive_start(EXCHANGE_SERIALIZE, icall);
        if (sess != NULL) {
                if (multim_dev->console_sess == NULL) {
                        multim_dev->console_sess = sess;
                        usb_log_debug(NAME " Saved session to console: %p\n",
                            sess);
                        async_answer_0(icallid, EOK);
                } else
                        async_answer_0(icallid, ELIMIT);
        } else
                async_answer_0(icallid, EINVAL);
}

/*----------------------------------------------------------------------------*/

static ddf_dev_ops_t multimedia_ops = {
        .default_handler = default_connection_handler
};

/*----------------------------------------------------------------------------*/
/**
 * Processes key events.
 *
 * @note This function was copied from AT keyboard driver and modified to suit
 *       USB keyboard.
 *
 * @note Lock keys are not sent to the console, as they are completely handled
 *       in the driver. It may, however, be required later that the driver
 *       sends also these keys to application (otherwise it cannot use those
 *       keys at all).
 * 
 * @param hid_dev 
 * @param lgtch_dev 
 * @param type Type of the event (press / release). Recognized values: 
 *             KEY_PRESS, KEY_RELEASE
 * @param key Key code of the key according to HID Usage Tables.
 */
static void usb_multimedia_push_ev(usb_hid_dev_t *hid_dev, 
    usb_multimedia_t *multim_dev, int type, unsigned int key)
{
        assert(hid_dev != NULL);
        assert(multim_dev != NULL);

        kbd_event_t ev;

        ev.type = type;
        ev.key = key;
        ev.mods = 0;
        ev.c = 0;

        usb_log_debug2(NAME " Sending key %d to the console\n", ev.key);
        if (multim_dev->console_sess == NULL) {
                usb_log_warning(
                    "Connection to console not ready, key discarded.\n");
                return;
        }

        async_exch_t *exch = async_exchange_begin(multim_dev->console_sess);
        async_msg_4(exch, KBDEV_EVENT, ev.type, ev.key, ev.mods, ev.c);
        async_exchange_end(exch);
}

/*----------------------------------------------------------------------------*/

static int usb_multimedia_create_function(usb_hid_dev_t *hid_dev, 
    usb_multimedia_t *multim_dev)
{
        /* Create the exposed function. */
        ddf_fun_t *fun = ddf_fun_create(hid_dev->usb_dev->ddf_dev, fun_exposed, 
            NAME);
        if (fun == NULL) {
                usb_log_error("Could not create DDF function node.\n");
                return ENOMEM;
        }

        fun->ops = &multimedia_ops;
        fun->driver_data = multim_dev;   // TODO: maybe change to hid_dev->data

        int rc = ddf_fun_bind(fun);
        if (rc != EOK) {
                usb_log_error("Could not bind DDF function: %s.\n",
                    str_error(rc));
                ddf_fun_destroy(fun);
                return rc;
        }

        usb_log_debug("%s function created (handle: %" PRIun ").\n",
            NAME, fun->handle);

        rc = ddf_fun_add_to_category(fun, "keyboard");
        if (rc != EOK) {
                usb_log_error(
                    "Could not add DDF function to category 'keyboard': %s.\n",
                    str_error(rc));
                ddf_fun_destroy(fun);
                return rc;
        }
        multim_dev->fun = fun;

        return EOK;
}

/*----------------------------------------------------------------------------*/

int usb_multimedia_init(struct usb_hid_dev *hid_dev, void **data)
{
        if (hid_dev == NULL || hid_dev->usb_dev == NULL) {
                return EINVAL; /*! @todo Other return code? */
        }

        usb_log_debug(NAME " Initializing HID/multimedia structure...\n");

        usb_multimedia_t *multim_dev = (usb_multimedia_t *)malloc(
            sizeof(usb_multimedia_t));
        if (multim_dev == NULL) {
                return ENOMEM;
        }

        multim_dev->console_sess = NULL;

        /*! @todo Autorepeat */

        // save the KBD device structure into the HID device structure
        *data = multim_dev;

        usb_log_debug(NAME " HID/multimedia device structure initialized.\n");

        int rc = usb_multimedia_create_function(hid_dev, multim_dev);
        if (rc != EOK)
                return rc;

        usb_log_debug(NAME " HID/multimedia structure initialized.\n");

        return EOK;
}

/*----------------------------------------------------------------------------*/

void usb_multimedia_deinit(struct usb_hid_dev *hid_dev, void *data)
{
        if (hid_dev == NULL) {
                return;
        }

        if (data != NULL) {
                usb_multimedia_t *multim_dev = (usb_multimedia_t *)data;
                // hangup session to the console
                async_hangup(multim_dev->console_sess);
                const int ret = ddf_fun_unbind(multim_dev->fun);
                if (ret != EOK) {
                        usb_log_error("Failed to unbind multim function.\n");
                } else {
                        ddf_fun_destroy(multim_dev->fun);
                }
        }
}

/*----------------------------------------------------------------------------*/

bool usb_multimedia_polling_callback(struct usb_hid_dev *hid_dev, void *data)
{
        // TODO: checks
        if (hid_dev == NULL || data == NULL) {
                return false;
        }

        usb_multimedia_t *multim_dev = (usb_multimedia_t *)data;

        usb_hid_report_path_t *path = usb_hid_report_path();
        usb_hid_report_path_append_item(path, USB_HIDUT_PAGE_CONSUMER, 0);

        usb_hid_report_path_set_report_id(path, hid_dev->report_id);

        usb_hid_report_field_t *field = usb_hid_report_get_sibling(
            hid_dev->report, NULL, path, USB_HID_PATH_COMPARE_END 
            | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY, 
            USB_HID_REPORT_TYPE_INPUT);

        /*! @todo Is this iterating OK if done multiple times? 
         *  @todo The parsing is not OK
         */
        while (field != NULL) {
                if(field->value != 0) {
                        usb_log_debug(NAME " KEY VALUE(%X) USAGE(%X)\n", 
                            field->value, field->usage);
                        unsigned int key = 
                            usb_multimedia_map_usage(field->usage);
                        const char *key_str = 
                            usbhid_multimedia_usage_to_str(field->usage);
                        usb_log_info("Pressed key: %s\n", key_str);
                        usb_multimedia_push_ev(hid_dev, multim_dev, KEY_PRESS, 
                                               key);
                }

                field = usb_hid_report_get_sibling(
                    hid_dev->report, field, path, USB_HID_PATH_COMPARE_END
                    | USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY, 
                    USB_HID_REPORT_TYPE_INPUT);
        }

        usb_hid_report_path_free(path);

        return true;
}

/**
 * @}
 */