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path: root/drivers/gpu/drm/bridge/dumb-vga-dac.c
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Diffstat (limited to 'drivers/gpu/drm/bridge/dumb-vga-dac.c')
-rw-r--r--drivers/gpu/drm/bridge/dumb-vga-dac.c249
1 files changed, 0 insertions, 249 deletions
diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
deleted file mode 100644
index 831a606c4706..000000000000
--- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
+++ /dev/null
@@ -1,249 +0,0 @@
-/*
- * Copyright (C) 2015-2016 Free Electrons
- * Copyright (C) 2015-2016 NextThing Co
- *
- * Maxime Ripard <maxime.ripard@free-electrons.com>
- *
- * 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.
- */
-
-#include <linux/module.h>
-#include <linux/of_graph.h>
-#include <linux/regulator/consumer.h>
-
-#include <drm/drmP.h>
-#include <drm/drm_atomic_helper.h>
-#include <drm/drm_crtc.h>
-#include <drm/drm_crtc_helper.h>
-
-struct dumb_vga {
- struct drm_bridge bridge;
- struct drm_connector connector;
-
- struct i2c_adapter *ddc;
- struct regulator *vdd;
-};
-
-static inline struct dumb_vga *
-drm_bridge_to_dumb_vga(struct drm_bridge *bridge)
-{
- return container_of(bridge, struct dumb_vga, bridge);
-}
-
-static inline struct dumb_vga *
-drm_connector_to_dumb_vga(struct drm_connector *connector)
-{
- return container_of(connector, struct dumb_vga, connector);
-}
-
-static int dumb_vga_get_modes(struct drm_connector *connector)
-{
- struct dumb_vga *vga = drm_connector_to_dumb_vga(connector);
- struct edid *edid;
- int ret;
-
- if (IS_ERR(vga->ddc))
- goto fallback;
-
- edid = drm_get_edid(connector, vga->ddc);
- if (!edid) {
- DRM_INFO("EDID readout failed, falling back to standard modes\n");
- goto fallback;
- }
-
- drm_mode_connector_update_edid_property(connector, edid);
- return drm_add_edid_modes(connector, edid);
-
-fallback:
- /*
- * In case we cannot retrieve the EDIDs (broken or missing i2c
- * bus), fallback on the XGA standards
- */
- ret = drm_add_modes_noedid(connector, 1920, 1200);
-
- /* And prefer a mode pretty much anyone can handle */
- drm_set_preferred_mode(connector, 1024, 768);
-
- return ret;
-}
-
-static const struct drm_connector_helper_funcs dumb_vga_con_helper_funcs = {
- .get_modes = dumb_vga_get_modes,
-};
-
-static enum drm_connector_status
-dumb_vga_connector_detect(struct drm_connector *connector, bool force)
-{
- struct dumb_vga *vga = drm_connector_to_dumb_vga(connector);
-
- /*
- * Even if we have an I2C bus, we can't assume that the cable
- * is disconnected if drm_probe_ddc fails. Some cables don't
- * wire the DDC pins, or the I2C bus might not be working at
- * all.
- */
- if (!IS_ERR(vga->ddc) && drm_probe_ddc(vga->ddc))
- return connector_status_connected;
-
- return connector_status_unknown;
-}
-
-static const struct drm_connector_funcs dumb_vga_con_funcs = {
- .dpms = drm_atomic_helper_connector_dpms,
- .detect = dumb_vga_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 int dumb_vga_attach(struct drm_bridge *bridge)
-{
- struct dumb_vga *vga = drm_bridge_to_dumb_vga(bridge);
- int ret;
-
- if (!bridge->encoder) {
- DRM_ERROR("Missing encoder\n");
- return -ENODEV;
- }
-
- drm_connector_helper_add(&vga->connector,
- &dumb_vga_con_helper_funcs);
- ret = drm_connector_init(bridge->dev, &vga->connector,
- &dumb_vga_con_funcs, DRM_MODE_CONNECTOR_VGA);
- if (ret) {
- DRM_ERROR("Failed to initialize connector\n");
- return ret;
- }
-
- drm_mode_connector_attach_encoder(&vga->connector,
- bridge->encoder);
-
- return 0;
-}
-
-static void dumb_vga_enable(struct drm_bridge *bridge)
-{
- struct dumb_vga *vga = drm_bridge_to_dumb_vga(bridge);
- int ret = 0;
-
- if (vga->vdd)
- ret = regulator_enable(vga->vdd);
-
- if (ret)
- DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);
-}
-
-static void dumb_vga_disable(struct drm_bridge *bridge)
-{
- struct dumb_vga *vga = drm_bridge_to_dumb_vga(bridge);
-
- if (vga->vdd)
- regulator_disable(vga->vdd);
-}
-
-static const struct drm_bridge_funcs dumb_vga_bridge_funcs = {
- .attach = dumb_vga_attach,
- .enable = dumb_vga_enable,
- .disable = dumb_vga_disable,
-};
-
-static struct i2c_adapter *dumb_vga_retrieve_ddc(struct device *dev)
-{
- struct device_node *phandle, *remote;
- struct i2c_adapter *ddc;
-
- remote = of_graph_get_remote_node(dev->of_node, 1, -1);
- if (!remote)
- return ERR_PTR(-EINVAL);
-
- phandle = of_parse_phandle(remote, "ddc-i2c-bus", 0);
- of_node_put(remote);
- if (!phandle)
- return ERR_PTR(-ENODEV);
-
- ddc = of_get_i2c_adapter_by_node(phandle);
- of_node_put(phandle);
- if (!ddc)
- return ERR_PTR(-EPROBE_DEFER);
-
- return ddc;
-}
-
-static int dumb_vga_probe(struct platform_device *pdev)
-{
- struct dumb_vga *vga;
- int ret;
-
- vga = devm_kzalloc(&pdev->dev, sizeof(*vga), GFP_KERNEL);
- if (!vga)
- return -ENOMEM;
- platform_set_drvdata(pdev, vga);
-
- vga->vdd = devm_regulator_get_optional(&pdev->dev, "vdd");
- if (IS_ERR(vga->vdd)) {
- ret = PTR_ERR(vga->vdd);
- if (ret == -EPROBE_DEFER)
- return -EPROBE_DEFER;
- vga->vdd = NULL;
- dev_dbg(&pdev->dev, "No vdd regulator found: %d\n", ret);
- }
-
- vga->ddc = dumb_vga_retrieve_ddc(&pdev->dev);
- if (IS_ERR(vga->ddc)) {
- if (PTR_ERR(vga->ddc) == -ENODEV) {
- dev_dbg(&pdev->dev,
- "No i2c bus specified. Disabling EDID readout\n");
- } else {
- dev_err(&pdev->dev, "Couldn't retrieve i2c bus\n");
- return PTR_ERR(vga->ddc);
- }
- }
-
- vga->bridge.funcs = &dumb_vga_bridge_funcs;
- vga->bridge.of_node = pdev->dev.of_node;
-
- ret = drm_bridge_add(&vga->bridge);
- if (ret && !IS_ERR(vga->ddc))
- i2c_put_adapter(vga->ddc);
-
- return ret;
-}
-
-static int dumb_vga_remove(struct platform_device *pdev)
-{
- struct dumb_vga *vga = platform_get_drvdata(pdev);
-
- drm_bridge_remove(&vga->bridge);
-
- if (!IS_ERR(vga->ddc))
- i2c_put_adapter(vga->ddc);
-
- return 0;
-}
-
-static const struct of_device_id dumb_vga_match[] = {
- { .compatible = "dumb-vga-dac" },
- { .compatible = "adi,adv7123" },
- { .compatible = "ti,ths8135" },
- {},
-};
-MODULE_DEVICE_TABLE(of, dumb_vga_match);
-
-static struct platform_driver dumb_vga_driver = {
- .probe = dumb_vga_probe,
- .remove = dumb_vga_remove,
- .driver = {
- .name = "dumb-vga-dac",
- .of_match_table = dumb_vga_match,
- },
-};
-module_platform_driver(dumb_vga_driver);
-
-MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
-MODULE_DESCRIPTION("Dumb VGA DAC bridge driver");
-MODULE_LICENSE("GPL");
generated by cgit (git 2.34.1) at 2025-12-25 21:04:06 +0000