| /* |
| * DRM driver for the legacy Freescale adapter card holding |
| * Seiko RA169Z20 43WVFIG LCD panel |
| * |
| * Copyright (C) 2018 NXP |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <drm/drmP.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/drm_of.h> |
| #include <drm/drm_panel.h> |
| #include <linux/of.h> |
| #include <linux/of_graph.h> |
| #include <linux/of_platform.h> |
| |
| struct seiko_adapter { |
| struct device *dev; |
| struct drm_panel *panel; |
| struct drm_bridge bridge; |
| struct drm_connector connector; |
| |
| u32 bpc; |
| u32 bus_format; |
| }; |
| |
| static enum drm_connector_status seiko_adapter_connector_detect( |
| struct drm_connector *connector, bool force) |
| { |
| return connector_status_connected; |
| } |
| |
| static int seiko_adapter_connector_get_modes(struct drm_connector *connector) |
| { |
| int num_modes; |
| |
| struct seiko_adapter *adap = container_of(connector, |
| struct seiko_adapter, |
| connector); |
| |
| num_modes = drm_panel_get_modes(adap->panel); |
| |
| /* |
| * The panel will populate the connector display_info properties with |
| * fixed numbers, but we need to change them according to our |
| * configuration. |
| */ |
| connector->display_info.bpc = adap->bpc; |
| drm_display_info_set_bus_formats(&connector->display_info, |
| &adap->bus_format, 1); |
| |
| return num_modes; |
| } |
| |
| static const struct drm_connector_funcs seiko_adapter_connector_funcs = { |
| .detect = seiko_adapter_connector_detect, |
| .fill_modes = drm_helper_probe_single_connector_modes, |
| .destroy = drm_connector_cleanup, |
| .reset = drm_atomic_helper_connector_reset, |
| .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, |
| .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, |
| }; |
| |
| static const struct drm_connector_helper_funcs |
| seiko_adapter_connector_helper_funcs = { |
| .get_modes = seiko_adapter_connector_get_modes, |
| }; |
| |
| static int seiko_adapter_bridge_attach(struct drm_bridge *bridge) |
| { |
| struct seiko_adapter *adap = bridge->driver_private; |
| struct device *dev = adap->dev; |
| struct drm_encoder *encoder = bridge->encoder; |
| struct drm_device *drm; |
| int ret = 0; |
| |
| if (!encoder) { |
| DRM_DEV_ERROR(dev, "Parent encoder object not found\n"); |
| return -ENODEV; |
| } |
| |
| drm = encoder->dev; |
| |
| /* |
| * Create the connector for our panel |
| */ |
| |
| ret = drm_connector_init(drm, &adap->connector, |
| &seiko_adapter_connector_funcs, |
| DRM_MODE_CONNECTOR_DPI); |
| if (ret) { |
| DRM_DEV_ERROR(dev, "Failed to init drm connector: %d\n", ret); |
| return ret; |
| } |
| |
| drm_connector_helper_add(&adap->connector, |
| &seiko_adapter_connector_helper_funcs); |
| |
| adap->connector.dpms = DRM_MODE_DPMS_OFF; |
| drm_mode_connector_attach_encoder(&adap->connector, encoder); |
| |
| ret = drm_panel_attach(adap->panel, &adap->connector); |
| if (ret) { |
| DRM_DEV_ERROR(dev, "Failed to attach panel: %d\n", ret); |
| drm_connector_cleanup(&adap->connector); |
| return ret; |
| } |
| |
| return ret; |
| } |
| |
| static void seiko_adapter_bridge_detach(struct drm_bridge *bridge) |
| { |
| struct seiko_adapter *adap = bridge->driver_private; |
| |
| drm_panel_detach(adap->panel); |
| drm_connector_cleanup(&adap->connector); |
| } |
| |
| static void seiko_adapter_bridge_enable(struct drm_bridge *bridge) |
| { |
| struct seiko_adapter *adap = bridge->driver_private; |
| struct device *dev = adap->dev; |
| |
| if (drm_panel_prepare(adap->panel)) { |
| DRM_DEV_ERROR(dev, "Failed to prepare panel\n"); |
| return; |
| } |
| |
| if (drm_panel_enable(adap->panel)) { |
| DRM_DEV_ERROR(dev, "Failed to enable panel\n"); |
| drm_panel_unprepare(adap->panel); |
| } |
| } |
| |
| static void seiko_adapter_bridge_disable(struct drm_bridge *bridge) |
| { |
| struct seiko_adapter *adap = bridge->driver_private; |
| struct device *dev = adap->dev; |
| |
| if (drm_panel_disable(adap->panel)) { |
| DRM_DEV_ERROR(dev, "failed to disable panel\n"); |
| return; |
| } |
| |
| if (drm_panel_unprepare(adap->panel)) |
| DRM_DEV_ERROR(dev, "failed to unprepare panel\n"); |
| } |
| |
| static const struct drm_bridge_funcs seiko_adapter_bridge_funcs = { |
| .enable = seiko_adapter_bridge_enable, |
| .disable = seiko_adapter_bridge_disable, |
| .attach = seiko_adapter_bridge_attach, |
| .detach = seiko_adapter_bridge_detach, |
| }; |
| |
| static int seiko_adapter_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct seiko_adapter *adap; |
| struct device_node *remote; |
| u32 bus_mode; |
| int ret, port; |
| |
| adap = devm_kzalloc(dev, sizeof(*adap), GFP_KERNEL); |
| if (!adap) |
| return -ENOMEM; |
| |
| of_property_read_u32(dev->of_node, "bus_mode", &bus_mode); |
| if (bus_mode != 18 && bus_mode != 24) { |
| dev_err(dev, "Invalid bus_mode: %d\n", bus_mode); |
| return -EINVAL; |
| } |
| |
| switch (bus_mode) { |
| case 18: |
| adap->bpc = 6; |
| adap->bus_format = MEDIA_BUS_FMT_RGB666_1X18; |
| break; |
| case 24: |
| adap->bpc = 8; |
| adap->bus_format = MEDIA_BUS_FMT_RGB888_1X24; |
| break; |
| } |
| |
| for (port = 0; port < 2; port++) { |
| remote = of_graph_get_remote_node(dev->of_node, port, -1); |
| if (!remote) { |
| pr_info("No remote for port %d\n", port); |
| return -ENODEV; |
| } |
| adap->panel = of_drm_find_panel(remote); |
| if (adap->panel) |
| break; |
| } |
| if (!adap->panel) { |
| dev_err(dev, "No panel found!\n"); |
| return -ENODEV; |
| } |
| |
| adap->dev = dev; |
| adap->bridge.driver_private = adap; |
| adap->bridge.funcs = &seiko_adapter_bridge_funcs; |
| adap->bridge.of_node = dev->of_node; |
| |
| ret = drm_bridge_add(&adap->bridge); |
| if (ret < 0) |
| dev_err(dev, "Failed to add seiko-adapter bridge (%d)\n", ret); |
| |
| dev_info(dev, "Seiko adapter driver probed\n"); |
| return ret; |
| } |
| |
| static int seiko_adapter_remove(struct platform_device *pdev) |
| { |
| return 0; |
| } |
| |
| static const struct of_device_id seiko_adapter_dt_ids[] = { |
| { .compatible = "nxp,seiko-43wvfig" }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, seiko_adapter_dt_ids); |
| |
| static struct platform_driver seiko_adapter_driver = { |
| .probe = seiko_adapter_probe, |
| .remove = seiko_adapter_remove, |
| .driver = { |
| .of_match_table = seiko_adapter_dt_ids, |
| .name = "nxp-seiko-adapter", |
| }, |
| }; |
| |
| module_platform_driver(seiko_adapter_driver); |
| |
| MODULE_AUTHOR("NXP Semiconductor"); |
| MODULE_DESCRIPTION("Seiko 43WVFIG adapter card driver"); |
| MODULE_LICENSE("GPL"); |