diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/dumb-vga-dac.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/dumb-vga-dac.c | 300 |
1 files changed, 0 insertions, 300 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 cc33dc411b9e..000000000000 --- a/drivers/gpu/drm/bridge/dumb-vga-dac.c +++ /dev/null @@ -1,300 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright (C) 2015-2016 Free Electrons - * Copyright (C) 2015-2016 NextThing Co - * - * Maxime Ripard <maxime.ripard@free-electrons.com> - */ - -#include <linux/module.h> -#include <linux/of_device.h> -#include <linux/of_graph.h> -#include <linux/regulator/consumer.h> - -#include <drm/drm_atomic_helper.h> -#include <drm/drm_bridge.h> -#include <drm/drm_crtc.h> -#include <drm/drm_print.h> -#include <drm/drm_probe_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 (!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_connector_update_edid_property(connector, edid); - ret = drm_add_edid_modes(connector, edid); - kfree(edid); - return ret; - -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 (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 = { - .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_with_ddc(bridge->dev, &vga->connector, - &dumb_vga_con_funcs, - DRM_MODE_CONNECTOR_VGA, - vga->ddc); - if (ret) { - DRM_ERROR("Failed to initialize connector\n"); - return ret; - } - - drm_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; - - 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)) { - int 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"); - vga->ddc = NULL; - } 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; - vga->bridge.timings = of_device_get_match_data(&pdev->dev); - - drm_bridge_add(&vga->bridge); - - return 0; -} - -static int dumb_vga_remove(struct platform_device *pdev) -{ - struct dumb_vga *vga = platform_get_drvdata(pdev); - - drm_bridge_remove(&vga->bridge); - - if (vga->ddc) - i2c_put_adapter(vga->ddc); - - return 0; -} - -/* - * We assume the ADV7123 DAC is the "default" for historical reasons - * Information taken from the ADV7123 datasheet, revision D. - * NOTE: the ADV7123EP seems to have other timings and need a new timings - * set if used. - */ -static const struct drm_bridge_timings default_dac_timings = { - /* Timing specifications, datasheet page 7 */ - .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE, - .setup_time_ps = 500, - .hold_time_ps = 1500, -}; - -/* - * Information taken from the THS8134, THS8134A, THS8134B datasheet named - * "SLVS205D", dated May 1990, revised March 2000. - */ -static const struct drm_bridge_timings ti_ths8134_dac_timings = { - /* From timing diagram, datasheet page 9 */ - .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE, - /* From datasheet, page 12 */ - .setup_time_ps = 3000, - /* I guess this means latched input */ - .hold_time_ps = 0, -}; - -/* - * Information taken from the THS8135 datasheet named "SLAS343B", dated - * May 2001, revised April 2013. - */ -static const struct drm_bridge_timings ti_ths8135_dac_timings = { - /* From timing diagram, datasheet page 14 */ - .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE, - /* From datasheet, page 16 */ - .setup_time_ps = 2000, - .hold_time_ps = 500, -}; - -static const struct of_device_id dumb_vga_match[] = { - { - .compatible = "dumb-vga-dac", - .data = NULL, - }, - { - .compatible = "adi,adv7123", - .data = &default_dac_timings, - }, - { - .compatible = "ti,ths8135", - .data = &ti_ths8135_dac_timings, - }, - { - .compatible = "ti,ths8134", - .data = &ti_ths8134_dac_timings, - }, - {}, -}; -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"); |