source: mainline/uspace/drv/bus/usb/usbhid/usbhid.c@ 741bcdeb

/*
 * Copyright (c) 2011 Lubos Slovak
 * 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 HID driver API.
 */

#include <usb/debug.h>
#include <usb/classes/classes.h>
#include <usb/hid/hid.h>
#include <usb/hid/hidparser.h>
#include <usb/hid/hidreport.h>
#include <usb/hid/request.h>

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

#include "usbhid.h"

#include "kbd/kbddev.h"
#include "generic/hiddev.h"
#include "mouse/mousedev.h"
#include "subdrivers.h"

/* Array of endpoints expected on the device, NULL terminated. */
const usb_endpoint_description_t *usb_hid_endpoints[] = {
        &usb_hid_kbd_poll_endpoint_description,
        &usb_hid_mouse_poll_endpoint_description,
        &usb_hid_generic_poll_endpoint_description,
        NULL
};

static int usb_hid_set_boot_kbd_subdriver(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL);
        assert(hid_dev->subdriver_count == 0);

        hid_dev->subdrivers = malloc(sizeof(usb_hid_subdriver_t));
        if (hid_dev->subdrivers == NULL) {
                return ENOMEM;
        }
        hid_dev->subdriver_count = 1;
        // TODO 0 should be keyboard, but find a better way
        hid_dev->subdrivers[0] = usb_hid_subdrivers[0].subdriver;

        return EOK;
}

static int usb_hid_set_boot_mouse_subdriver(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL);
        assert(hid_dev->subdriver_count == 0);

        hid_dev->subdrivers = malloc(sizeof(usb_hid_subdriver_t));
        if (hid_dev->subdrivers == NULL) {
                return ENOMEM;
        }
        hid_dev->subdriver_count = 1;
        // TODO 2 should be mouse, but find a better way
        hid_dev->subdrivers[0] = usb_hid_subdrivers[2].subdriver;

        return EOK;
}

static int usb_hid_set_generic_hid_subdriver(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL);
        assert(hid_dev->subdriver_count == 0);

        hid_dev->subdrivers = malloc(sizeof(usb_hid_subdriver_t));
        if (hid_dev->subdrivers == NULL) {
                return ENOMEM;
        }
        hid_dev->subdriver_count = 1;

        /* Set generic hid subdriver routines */
        hid_dev->subdrivers[0].init = usb_generic_hid_init;
        hid_dev->subdrivers[0].poll = usb_generic_hid_polling_callback;
        hid_dev->subdrivers[0].poll_end = NULL;
        hid_dev->subdrivers[0].deinit = usb_generic_hid_deinit;

        return EOK;
}

static bool usb_hid_ids_match(const usb_hid_dev_t *hid_dev,
    const usb_hid_subdriver_mapping_t *mapping)
{
        assert(hid_dev);
        assert(hid_dev->usb_dev);
        assert(mapping);
        const usb_standard_device_descriptor_t *d =
            &usb_device_descriptors(hid_dev->usb_dev)->device;

        return (d->vendor_id == mapping->vendor_id)
            && (d->product_id == mapping->product_id);
}

static bool usb_hid_path_matches(usb_hid_dev_t *hid_dev,
    const usb_hid_subdriver_mapping_t *mapping)
{
        assert(hid_dev != NULL);
        assert(mapping != NULL);

        usb_hid_report_path_t *usage_path = usb_hid_report_path();
        if (usage_path == NULL) {
                usb_log_debug("Failed to create usage path.\n");
                return false;
        }

        for (int i = 0; mapping->usage_path[i].usage != 0
            || mapping->usage_path[i].usage_page != 0; ++i) {
                if (usb_hid_report_path_append_item(usage_path,
                    mapping->usage_path[i].usage_page,
                    mapping->usage_path[i].usage) != EOK) {
                        usb_log_debug("Failed to append to usage path.\n");
                        usb_hid_report_path_free(usage_path);
                        return false;
                }
        }

        usb_log_debug("Compare flags: %d\n", mapping->compare);

        bool matches = false;
        uint8_t report_id = mapping->report_id;

        do {
                usb_log_debug("Trying report id %u\n", report_id);
                if (report_id != 0) {
                        usb_hid_report_path_set_report_id(usage_path,
                                report_id);
                }

                const usb_hid_report_field_t *field =
                    usb_hid_report_get_sibling(
                        &hid_dev->report, NULL, usage_path, mapping->compare,
                        USB_HID_REPORT_TYPE_INPUT);

                usb_log_debug("Field: %p\n", field);

                if (field != NULL) {
                        matches = true;
                        break;
                }

                report_id = usb_hid_get_next_report_id(
                    &hid_dev->report, report_id, USB_HID_REPORT_TYPE_INPUT);
        } while (!matches && report_id != 0);

        usb_hid_report_path_free(usage_path);

        return matches;
}

static int usb_hid_save_subdrivers(usb_hid_dev_t *hid_dev,
    const usb_hid_subdriver_t **subdrivers, unsigned count)
{
        assert(hid_dev);
        assert(subdrivers);

        if (count == 0) {
                hid_dev->subdriver_count = 0;
                hid_dev->subdrivers = NULL;
                return EOK;
        }

        /* +1 for generic hid subdriver */
        hid_dev->subdrivers = calloc((count + 1), sizeof(usb_hid_subdriver_t));
        if (hid_dev->subdrivers == NULL) {
                return ENOMEM;
        }

        for (unsigned i = 0; i < count; ++i) {
                hid_dev->subdrivers[i] = *subdrivers[i];
        }

        /* Add one generic HID subdriver per device */
        hid_dev->subdrivers[count].init = usb_generic_hid_init;
        hid_dev->subdrivers[count].poll = usb_generic_hid_polling_callback;
        hid_dev->subdrivers[count].deinit = usb_generic_hid_deinit;
        hid_dev->subdrivers[count].poll_end = NULL;

        hid_dev->subdriver_count = count + 1;

        return EOK;
}

static int usb_hid_find_subdrivers(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL);

        const usb_hid_subdriver_t *subdrivers[USB_HID_MAX_SUBDRIVERS];
        unsigned count = 0;

        for (unsigned i = 0; i < USB_HID_MAX_SUBDRIVERS; ++i) {
                const usb_hid_subdriver_mapping_t *mapping =
                    &usb_hid_subdrivers[i];
                /* Check the vendor & product ID. */
                if (mapping->vendor_id >= 0 && mapping->product_id < 0) {
                        usb_log_warning("Mapping[%d]: Missing Product ID for "
                            "Vendor ID %d\n", i, mapping->vendor_id);
                }
                if (mapping->product_id >= 0 && mapping->vendor_id < 0) {
                        usb_log_warning("Mapping[%d]: Missing Vendor ID for "
                            "Product ID %d\n", i, mapping->product_id);
                }

                bool matched = false;

                /* Check ID match. */
                if (mapping->vendor_id >= 0 && mapping->product_id >= 0) {
                        usb_log_debug("Comparing device against vendor ID %u"
                            " and product ID %u.\n", mapping->vendor_id,
                            mapping->product_id);
                        if (usb_hid_ids_match(hid_dev, mapping)) {
                                usb_log_debug("IDs matched.\n");
                                matched = true;
                        }
                }

                /* Check usage match. */
                if (mapping->usage_path != NULL) {
                        usb_log_debug("Comparing device against usage path.\n");
                        if (usb_hid_path_matches(hid_dev, mapping)) {
                                /* Does not matter if IDs were matched. */
                                matched = true;
                        }
                }

                if (matched) {
                        usb_log_debug("Subdriver matched.\n");
                        subdrivers[count++] = &mapping->subdriver;
                }
        }

        /* We have all subdrivers determined, save them into the hid device */
        return usb_hid_save_subdrivers(hid_dev, subdrivers, count);
}

static int usb_hid_check_pipes(usb_hid_dev_t *hid_dev, usb_device_t *dev)
{
        assert(hid_dev);
        assert(dev);

        static const struct {
                const usb_endpoint_description_t *desc;
                const char* description;
        } endpoints[] = {
                {&usb_hid_kbd_poll_endpoint_description, "Keyboard endpoint"},
                {&usb_hid_mouse_poll_endpoint_description, "Mouse endpoint"},
                {&usb_hid_generic_poll_endpoint_description, "Generic HID endpoint"},
        };

        for (unsigned i = 0; i < ARRAY_SIZE(endpoints); ++i) {
                usb_endpoint_mapping_t *epm =
                    usb_device_get_mapped_ep_desc(dev, endpoints[i].desc);
                if (epm && epm->present) {
                        usb_log_debug("Found: %s.\n", endpoints[i].description);
                        hid_dev->poll_pipe_mapping = epm;
                        return EOK;
                }
        }
        return ENOTSUP;
}

static int usb_hid_init_report(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev != NULL);

        uint8_t report_id = 0;
        size_t max_size = 0;

        do {
                usb_log_debug("Getting size of the report.\n");
                const size_t size =
                    usb_hid_report_byte_size(&hid_dev->report, report_id,
                        USB_HID_REPORT_TYPE_INPUT);
                usb_log_debug("Report ID: %u, size: %zu\n", report_id, size);
                max_size = (size > max_size) ? size : max_size;
                usb_log_debug("Getting next report ID\n");
                report_id = usb_hid_get_next_report_id(&hid_dev->report,
                    report_id, USB_HID_REPORT_TYPE_INPUT);
        } while (report_id != 0);

        usb_log_debug("Max size of input report: %zu\n", max_size);

        assert(hid_dev->input_report == NULL);

        hid_dev->input_report = calloc(1, max_size);
        if (hid_dev->input_report == NULL) {
                return ENOMEM;
        }
        hid_dev->max_input_report_size = max_size;

        return EOK;
}

/*
 * This functions initializes required structures from the device's descriptors
 * and starts new fibril for polling the keyboard for events and another one for
 * handling auto-repeat of keys.
 *
 * During initialization, the keyboard is switched into boot protocol, the idle
 * rate is set to 0 (infinity), resulting in the keyboard only reporting event
 * when a key is pressed or released. Finally, the LED lights are turned on 
 * according to the default setup of lock keys.
 *
 * @note By default, the keyboards is initialized with Num Lock turned on and 
 *       other locks turned off.
 *
 * @param hid_dev Device to initialize, non-NULL.
 * @param dev USB device, non-NULL.
 * @return Error code.
 */
int usb_hid_init(usb_hid_dev_t *hid_dev, usb_device_t *dev)
{
        assert(hid_dev);
        assert(dev);

        usb_log_debug("Initializing HID structure...\n");

        usb_hid_report_init(&hid_dev->report);

        /* The USB device should already be initialized, save it in structure */
        hid_dev->usb_dev = dev;
        hid_dev->poll_pipe_mapping = NULL;

        int rc = usb_hid_check_pipes(hid_dev, dev);
        if (rc != EOK) {
                return rc;
        }

        /* Get the report descriptor and parse it. */
        rc = usb_hid_process_report_descriptor(
            hid_dev->usb_dev, &hid_dev->report, &hid_dev->report_desc,
            &hid_dev->report_desc_size);

        /* If report parsing went well, find subdrivers. */
        if (rc == EOK) {
                usb_hid_find_subdrivers(hid_dev);
        } else {
                usb_log_error("Failed to parse report descriptor: fallback.\n");
                hid_dev->subdrivers = NULL;
                hid_dev->subdriver_count = 0;
        }

        usb_log_debug("Subdriver count(before trying boot protocol): %d\n",
            hid_dev->subdriver_count);

        /* No subdrivers, fall back to the boot protocol if available. */
        if (hid_dev->subdriver_count == 0) {
                assert(hid_dev->subdrivers == NULL);
                usb_log_info("No subdrivers found to handle device, trying "
                    "boot protocol.\n");

                switch (hid_dev->poll_pipe_mapping->interface->interface_protocol) {
                case USB_HID_PROTOCOL_KEYBOARD:
                        usb_log_info("Falling back to kbd boot protocol.\n");
                        rc = usb_kbd_set_boot_protocol(hid_dev);
                        if (rc == EOK) {
                                usb_hid_set_boot_kbd_subdriver(hid_dev);
                        }
                        break;
                case USB_HID_PROTOCOL_MOUSE:
                        usb_log_info("Falling back to mouse boot protocol.\n");
                        rc = usb_mouse_set_boot_protocol(hid_dev);
                        if (rc == EOK) {
                                usb_hid_set_boot_mouse_subdriver(hid_dev);
                        }
                        break;
                default:
                        usb_log_info("Falling back to generic HID driver.\n");
                        usb_hid_set_generic_hid_subdriver(hid_dev);
                }
        }

        usb_log_debug("Subdriver count(after trying boot protocol): %d\n",
            hid_dev->subdriver_count);

        /* Still no subdrivers? */
        if (hid_dev->subdriver_count == 0) {
                assert(hid_dev->subdrivers == NULL);
                usb_log_error(
                    "No subdriver for handling this device could be found.\n");
                return ENOTSUP;
        }

        /* Initialize subdrivers */
        bool ok = false;
        for (unsigned i = 0; i < hid_dev->subdriver_count; ++i) {
                if (hid_dev->subdrivers[i].init != NULL) {
                        usb_log_debug("Initializing subdriver %d.\n",i);
                        const int pret = hid_dev->subdrivers[i].init(hid_dev,
                            &hid_dev->subdrivers[i].data);
                        if (pret != EOK) {
                                usb_log_warning("Failed to initialize"
                                    " HID subdriver structure: %s.\n",
                                    str_error(pret));
                                rc = pret;
                        } else {
                                /* At least one subdriver initialized. */
                                ok = true;
                        }
                } else {
                        /* Does not need initialization. */
                        ok = true;
                }
        }

        if (ok) {
                /* Save max input report size and
                 * allocate space for the report */
                rc = usb_hid_init_report(hid_dev);
                if (rc != EOK) {
                        usb_log_error("Failed to initialize input report buffer"
                            ".\n");
                }
        }

        return rc;
}

bool usb_hid_polling_callback(usb_device_t *dev, uint8_t *buffer,
    size_t buffer_size, void *arg)
{
        if (dev == NULL || arg == NULL || buffer == NULL) {
                usb_log_error("Missing arguments to polling callback.\n");
                return false;
        }
        usb_hid_dev_t *hid_dev = arg;

        assert(hid_dev->input_report != NULL);

        usb_log_debug("New data [%zu/%zu]: %s\n", buffer_size,
            hid_dev->max_input_report_size,
            usb_debug_str_buffer(buffer, buffer_size, 0));

        if (hid_dev->max_input_report_size >= buffer_size) {
                /*! @todo This should probably be atomic. */
                memcpy(hid_dev->input_report, buffer, buffer_size);
                hid_dev->input_report_size = buffer_size;
                usb_hid_new_report(hid_dev);
        }

        /* Parse the input report */
        const int rc = usb_hid_parse_report(
            &hid_dev->report, buffer, buffer_size, &hid_dev->report_id);
        if (rc != EOK) {
                usb_log_warning("Failure in usb_hid_parse_report():"
                    "%s\n", str_error(rc));
        }

        bool cont = false;
        /* Continue if at least one of the subdrivers want to continue */
        for (unsigned i = 0; i < hid_dev->subdriver_count; ++i) {
                if (hid_dev->subdrivers[i].poll != NULL) {
                        cont = cont || hid_dev->subdrivers[i].poll(
                            hid_dev, hid_dev->subdrivers[i].data);
                }
        }

        return cont;
}

void usb_hid_polling_ended_callback(usb_device_t *dev, bool reason, void *arg)
{
        assert(dev);
        assert(arg);

        usb_hid_dev_t *hid_dev = arg;

        for (unsigned i = 0; i < hid_dev->subdriver_count; ++i) {
                if (hid_dev->subdrivers[i].poll_end != NULL) {
                        hid_dev->subdrivers[i].poll_end(
                            hid_dev, hid_dev->subdrivers[i].data, reason);
                }
        }

        hid_dev->running = false;
}

void usb_hid_new_report(usb_hid_dev_t *hid_dev)
{
        ++hid_dev->report_nr;
}

int usb_hid_report_number(const usb_hid_dev_t *hid_dev)
{
        return hid_dev->report_nr;
}

void usb_hid_deinit(usb_hid_dev_t *hid_dev)
{
        assert(hid_dev);
        assert(hid_dev->subdrivers != NULL || hid_dev->subdriver_count == 0);


        usb_log_debug("Subdrivers: %p, subdriver count: %d\n", 
            hid_dev->subdrivers, hid_dev->subdriver_count);

        for (unsigned i = 0; i < hid_dev->subdriver_count; ++i) {
                if (hid_dev->subdrivers[i].deinit != NULL) {
                        hid_dev->subdrivers[i].deinit(hid_dev,
                            hid_dev->subdrivers[i].data);
                }
        }

        /* Free allocated structures */
        free(hid_dev->subdrivers);
        free(hid_dev->report_desc);

        /* Destroy the parser */
        usb_hid_report_deinit(&hid_dev->report);

}

/**
 * @}
 */