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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_connector.h"
#include "udl_drv.h"
static bool udl_get_edid_block(struct udl_device *udl, int block_idx,
u8 *buff)
{
int ret, i;
u8 *read_buff;
read_buff = kmalloc(2, GFP_KERNEL);
if (!read_buff)
return false;
for (i = 0; i < EDID_LENGTH; i++) {
int bval = (i + block_idx * EDID_LENGTH) << 8;
ret = usb_control_msg(udl->udev,
usb_rcvctrlpipe(udl->udev, 0),
(0x02), (0x80 | (0x02 << 5)), bval,
0xA1, read_buff, 2, HZ);
if (ret < 1) {
DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
kfree(read_buff);
return false;
}
buff[i] = read_buff[1];
}
kfree(read_buff);
return true;
}
static bool udl_get_edid(struct udl_device *udl, u8 **result_buff,
int *result_buff_size)
{
int i, extensions;
u8 *block_buff = NULL, *buff_ptr;
block_buff = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (block_buff == NULL)
return false;
if (udl_get_edid_block(udl, 0, block_buff) &&
memchr_inv(block_buff, 0, EDID_LENGTH)) {
extensions = ((struct edid *)block_buff)->extensions;
if (extensions > 0) {
/* we have to read all extensions one by one */
*result_buff_size = EDID_LENGTH * (extensions + 1);
*result_buff = kmalloc(*result_buff_size, GFP_KERNEL);
buff_ptr = *result_buff;
if (buff_ptr == NULL) {
kfree(block_buff);
return false;
}
memcpy(buff_ptr, block_buff, EDID_LENGTH);
kfree(block_buff);
buff_ptr += EDID_LENGTH;
for (i = 1; i < extensions; ++i) {
if (udl_get_edid_block(udl, i, buff_ptr)) {
buff_ptr += EDID_LENGTH;
} else {
kfree(*result_buff);
*result_buff = NULL;
return false;
}
}
return true;
}
/* we have only base edid block */
*result_buff = block_buff;
*result_buff_size = EDID_LENGTH;
return true;
}
kfree(block_buff);
return false;
}
static int udl_get_modes(struct drm_connector *connector)
{
struct udl_drm_connector *udl_connector =
container_of(connector,
struct udl_drm_connector,
connector);
drm_connector_update_edid_property(connector, udl_connector->edid);
if (udl_connector->edid)
return drm_add_edid_modes(connector, udl_connector->edid);
return 0;
}
static enum drm_mode_status 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)
{
u8 *edid_buff = NULL;
int edid_buff_size = 0;
struct udl_device *udl = connector->dev->dev_private;
struct udl_drm_connector *udl_connector =
container_of(connector,
struct udl_drm_connector,
connector);
/* cleanup previous edid */
if (udl_connector->edid != NULL) {
kfree(udl_connector->edid);
udl_connector->edid = NULL;
}
if (!udl_get_edid(udl, &edid_buff, &edid_buff_size))
return connector_status_disconnected;
udl_connector->edid = (struct edid *)edid_buff;
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, NULL, 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)
{
struct udl_drm_connector *udl_connector =
container_of(connector,
struct udl_drm_connector,
connector);
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
kfree(udl_connector->edid);
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 udl_drm_connector *udl_connector;
struct drm_connector *connector;
udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
if (!udl_connector)
return -ENOMEM;
connector = &udl_connector->connector;
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_connector_attach_encoder(connector, encoder);
connector->polled = DRM_CONNECTOR_POLL_HPD |
DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
return 0;
}
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