udl_connector.c

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/*
 * Copyright (C) 2012 Red Hat
 * based in parts on udlfb.c:
 * Copyright (C) 2009 Roberto De Ioris <[email protected]>
 * Copyright (C) 2009 Jaya Kumar <[email protected]>
 * Copyright (C) 2009 Bernie Thompson <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License v2. See the file COPYING in the main directory of this archive for
 * more details.
 */

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_crtc_helper.h>
#include "udl_drv.h"

/* dummy connector to just get EDID,
   all UDL appear to have a DVI-D */

static u8 *udl_get_edid(struct udl_device *udl)
{
    u8 *block;
    char rbuf[3];
    int ret, i;

    block = kmalloc(EDID_LENGTH, GFP_KERNEL);
    if (block == NULL)
        return NULL;

    for (i = 0; i < EDID_LENGTH; i++) {
        ret = usb_control_msg(udl->ddev->usbdev,
                      usb_rcvctrlpipe(udl->ddev->usbdev, 0), (0x02),
                      (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
                      HZ);
        if (ret < 1) {
            DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
            i--;
            goto error;
        }
        block[i] = rbuf[1];
    }

    return block;

error:
    kfree(block);
    return NULL;
}

static int udl_get_modes(struct drm_connector *connector)
{
    struct udl_device *udl = connector->dev->dev_private;
    struct edid *edid;
    int ret;

    edid = (struct edid *)udl_get_edid(udl);

    drm_mode_connector_update_edid_property(connector, edid);
    ret = drm_add_edid_modes(connector, edid);
    kfree(edid);
    return ret;
}

static int udl_mode_valid(struct drm_connector *connector,
              struct drm_display_mode *mode)
{
    struct udl_device *udl = connector->dev->dev_private;
    if (!udl->sku_pixel_limit)
        return 0;

    if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
        return MODE_VIRTUAL_Y;

    return 0;
}

static enum drm_connector_status
udl_detect(struct drm_connector *connector, bool force)
{
    if (drm_device_is_unplugged(connector->dev))
        return connector_status_disconnected;
    return connector_status_connected;
}

struct drm_encoder *udl_best_single_encoder(struct drm_connector *connector)
{
    int enc_id = connector->encoder_ids[0];
    struct drm_mode_object *obj;
    struct drm_encoder *encoder;

    obj = drm_mode_object_find(connector->dev, enc_id, DRM_MODE_OBJECT_ENCODER);
    if (!obj)
        return NULL;
    encoder = obj_to_encoder(obj);
    return encoder;
}

int udl_connector_set_property(struct drm_connector *connector, struct drm_property *property,
                   uint64_t val)
{
    return 0;
}

static void udl_connector_destroy(struct drm_connector *connector)
{
    drm_sysfs_connector_remove(connector);
    drm_connector_cleanup(connector);
    kfree(connector);
}

struct drm_connector_helper_funcs udl_connector_helper_funcs = {
    .get_modes = udl_get_modes,
    .mode_valid = udl_mode_valid,
    .best_encoder = udl_best_single_encoder,
};

struct drm_connector_funcs udl_connector_funcs = {
    .dpms = drm_helper_connector_dpms,
    .detect = udl_detect,
    .fill_modes = drm_helper_probe_single_connector_modes,
    .destroy = udl_connector_destroy,
    .set_property = udl_connector_set_property,
};

int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
{
    struct drm_connector *connector;

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

    drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
    drm_connector_helper_add(connector, &udl_connector_helper_funcs);

    drm_sysfs_connector_add(connector);
    drm_mode_connector_attach_encoder(connector, encoder);

    drm_connector_attach_property(connector,
                      dev->mode_config.dirty_info_property,
                      1);
    return 0;
}