diff options
Diffstat (limited to 'drivers/gpu/drm/udl/udl_connector.c')
| -rw-r--r-- | drivers/gpu/drm/udl/udl_connector.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c new file mode 100644 index 000000000..fade4c7ad --- /dev/null +++ b/drivers/gpu/drm/udl/udl_connector.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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> + */ + +#include <drm/drm_atomic_state_helper.h> +#include <drm/drm_edid.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_probe_helper.h> + +#include "udl_connector.h" +#include "udl_drv.h" + +static int udl_get_edid_block(void *data, u8 *buf, unsigned int block, + size_t len) +{ + int ret, i; + u8 *read_buff; + struct udl_device *udl = data; + struct usb_device *udev = udl_to_usb_device(udl); + + read_buff = kmalloc(2, GFP_KERNEL); + if (!read_buff) + return -1; + + for (i = 0; i < len; i++) { + int bval = (i + block * EDID_LENGTH) << 8; + ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), + 0x02, (0x80 | (0x02 << 5)), bval, + 0xA1, read_buff, 2, 1000); + if (ret < 1) { + DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret); + kfree(read_buff); + return -1; + } + buf[i] = read_buff[1]; + } + + kfree(read_buff); + return 0; +} + +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 = to_udl(connector->dev); + 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) +{ + struct udl_device *udl = to_udl(connector->dev); + 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; + } + + udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl); + if (!udl_connector->edid) + return connector_status_disconnected; + + return connector_status_connected; +} + +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_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, +}; + +static const struct drm_connector_funcs udl_connector_funcs = { + .reset = drm_atomic_helper_connector_reset, + .detect = udl_detect, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = udl_connector_destroy, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +struct drm_connector *udl_connector_init(struct drm_device *dev) +{ + struct udl_drm_connector *udl_connector; + struct drm_connector *connector; + + udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL); + if (!udl_connector) + return ERR_PTR(-ENOMEM); + + connector = &udl_connector->connector; + drm_connector_init(dev, connector, &udl_connector_funcs, + DRM_MODE_CONNECTOR_VGA); + drm_connector_helper_add(connector, &udl_connector_helper_funcs); + + connector->polled = DRM_CONNECTOR_POLL_HPD | + DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; + + return connector; +} |