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/*
* Copyright (C) 2012 Red Hat
* based in parts on udlfb.c:
* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
*
* 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;
int ret, i;
block = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (block == NULL)
return NULL;
rbuf = kmalloc(2, GFP_KERNEL);
if (rbuf == NULL)
goto error;
for (i = 0; i < EDID_LENGTH; i++) {
ret = usb_control_msg(udl->udev,
usb_rcvctrlpipe(udl->udev, 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);
goto error;
}
block[i] = rbuf[1];
}
kfree(rbuf);
return block;
error:
kfree(block);
kfree(rbuf);
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);
if (!edid) {
drm_mode_connector_update_edid_property(connector, NULL);
return 0;
}
/*
* We only read the main block, but if the monitor reports extension
* blocks then the drm edid code expects them to be present, so patch
* the extension count to 0.
*/
edid->checksum += edid->extensions;
edid->extensions = 0;
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_dev_is_unplugged(connector->dev))
return connector_status_disconnected;
return connector_status_connected;
}
static struct drm_encoder*
udl_best_single_encoder(struct drm_connector *connector)
{
int enc_id = connector->encoder_ids[0];
return drm_encoder_find(connector->dev, enc_id);
}
static 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_connector_unregister(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
static const 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,
};
static const 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_connector_register(connector);
drm_mode_connector_attach_encoder(connector, encoder);
return 0;
}
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