338 lines
8.6 KiB
C
338 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_edid.h>
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struct display_connector {
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struct drm_bridge bridge;
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struct gpio_desc *hpd_gpio;
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int hpd_irq;
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struct regulator *dp_pwr;
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};
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static inline struct display_connector *
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to_display_connector(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct display_connector, bridge);
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}
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static int display_connector_attach(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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return flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR ? 0 : -EINVAL;
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}
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static enum drm_connector_status
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display_connector_detect(struct drm_bridge *bridge)
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{
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struct display_connector *conn = to_display_connector(bridge);
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if (conn->hpd_gpio) {
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if (gpiod_get_value_cansleep(conn->hpd_gpio))
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return connector_status_connected;
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else
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return connector_status_disconnected;
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}
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if (conn->bridge.ddc && drm_probe_ddc(conn->bridge.ddc))
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return connector_status_connected;
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switch (conn->bridge.type) {
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case DRM_MODE_CONNECTOR_DVIA:
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case DRM_MODE_CONNECTOR_DVID:
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case DRM_MODE_CONNECTOR_DVII:
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case DRM_MODE_CONNECTOR_HDMIA:
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case DRM_MODE_CONNECTOR_HDMIB:
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/*
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* For DVI and HDMI connectors a DDC probe failure indicates
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* that no cable is connected.
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*/
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return connector_status_disconnected;
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case DRM_MODE_CONNECTOR_Composite:
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case DRM_MODE_CONNECTOR_SVIDEO:
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case DRM_MODE_CONNECTOR_VGA:
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default:
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/*
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* Composite and S-Video connectors have no other detection
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* mean than the HPD GPIO. For VGA connectors, even if we have
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* an I2C bus, we can't assume that the cable is disconnected
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* if drm_probe_ddc fails, as some cables don't wire the DDC
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* pins.
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*/
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return connector_status_unknown;
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}
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}
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static struct edid *display_connector_get_edid(struct drm_bridge *bridge,
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struct drm_connector *connector)
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{
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struct display_connector *conn = to_display_connector(bridge);
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return drm_get_edid(connector, conn->bridge.ddc);
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}
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static const struct drm_bridge_funcs display_connector_bridge_funcs = {
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.attach = display_connector_attach,
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.detect = display_connector_detect,
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.get_edid = display_connector_get_edid,
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};
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static irqreturn_t display_connector_hpd_irq(int irq, void *arg)
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{
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struct display_connector *conn = arg;
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struct drm_bridge *bridge = &conn->bridge;
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drm_bridge_hpd_notify(bridge, display_connector_detect(bridge));
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return IRQ_HANDLED;
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}
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static int display_connector_probe(struct platform_device *pdev)
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{
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struct display_connector *conn;
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unsigned int type;
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const char *label;
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int ret;
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conn = devm_kzalloc(&pdev->dev, sizeof(*conn), GFP_KERNEL);
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if (!conn)
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return -ENOMEM;
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platform_set_drvdata(pdev, conn);
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type = (uintptr_t)of_device_get_match_data(&pdev->dev);
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/* Get the exact connector type. */
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switch (type) {
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case DRM_MODE_CONNECTOR_DVII: {
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bool analog, digital;
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analog = of_property_read_bool(pdev->dev.of_node, "analog");
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digital = of_property_read_bool(pdev->dev.of_node, "digital");
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if (analog && !digital) {
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conn->bridge.type = DRM_MODE_CONNECTOR_DVIA;
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} else if (!analog && digital) {
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conn->bridge.type = DRM_MODE_CONNECTOR_DVID;
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} else if (analog && digital) {
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conn->bridge.type = DRM_MODE_CONNECTOR_DVII;
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} else {
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dev_err(&pdev->dev, "DVI connector with no type\n");
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return -EINVAL;
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}
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break;
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}
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case DRM_MODE_CONNECTOR_HDMIA: {
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const char *hdmi_type;
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ret = of_property_read_string(pdev->dev.of_node, "type",
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&hdmi_type);
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if (ret < 0) {
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dev_err(&pdev->dev, "HDMI connector with no type\n");
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return -EINVAL;
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}
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if (!strcmp(hdmi_type, "a") || !strcmp(hdmi_type, "c") ||
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!strcmp(hdmi_type, "d") || !strcmp(hdmi_type, "e")) {
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conn->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
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} else if (!strcmp(hdmi_type, "b")) {
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conn->bridge.type = DRM_MODE_CONNECTOR_HDMIB;
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} else {
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dev_err(&pdev->dev,
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"Unsupported HDMI connector type '%s'\n",
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hdmi_type);
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return -EINVAL;
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}
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break;
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}
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default:
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conn->bridge.type = type;
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break;
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}
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/* All the supported connector types support interlaced modes. */
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conn->bridge.interlace_allowed = true;
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/* Get the optional connector label. */
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of_property_read_string(pdev->dev.of_node, "label", &label);
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/*
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* Get the HPD GPIO for DVI, HDMI and DP connectors. If the GPIO can provide
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* edge interrupts, register an interrupt handler.
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*/
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if (type == DRM_MODE_CONNECTOR_DVII ||
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type == DRM_MODE_CONNECTOR_HDMIA ||
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type == DRM_MODE_CONNECTOR_DisplayPort) {
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conn->hpd_gpio = devm_gpiod_get_optional(&pdev->dev, "hpd",
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GPIOD_IN);
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if (IS_ERR(conn->hpd_gpio)) {
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if (PTR_ERR(conn->hpd_gpio) != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"Unable to retrieve HPD GPIO\n");
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return PTR_ERR(conn->hpd_gpio);
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}
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conn->hpd_irq = gpiod_to_irq(conn->hpd_gpio);
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} else {
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conn->hpd_irq = -EINVAL;
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}
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if (conn->hpd_irq >= 0) {
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ret = devm_request_threaded_irq(&pdev->dev, conn->hpd_irq,
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NULL, display_connector_hpd_irq,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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"HPD", conn);
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if (ret) {
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dev_info(&pdev->dev,
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"Failed to request HPD edge interrupt, falling back to polling\n");
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conn->hpd_irq = -EINVAL;
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}
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}
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/* Retrieve the DDC I2C adapter for DVI, HDMI and VGA connectors. */
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if (type == DRM_MODE_CONNECTOR_DVII ||
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type == DRM_MODE_CONNECTOR_HDMIA ||
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type == DRM_MODE_CONNECTOR_VGA) {
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struct device_node *phandle;
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phandle = of_parse_phandle(pdev->dev.of_node, "ddc-i2c-bus", 0);
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if (phandle) {
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conn->bridge.ddc = of_get_i2c_adapter_by_node(phandle);
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of_node_put(phandle);
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if (!conn->bridge.ddc)
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return -EPROBE_DEFER;
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} else {
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dev_dbg(&pdev->dev,
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"No I2C bus specified, disabling EDID readout\n");
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}
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}
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/* Get the DP PWR for DP connector. */
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if (type == DRM_MODE_CONNECTOR_DisplayPort) {
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int ret;
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conn->dp_pwr = devm_regulator_get_optional(&pdev->dev, "dp-pwr");
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if (IS_ERR(conn->dp_pwr)) {
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ret = PTR_ERR(conn->dp_pwr);
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switch (ret) {
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case -ENODEV:
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conn->dp_pwr = NULL;
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break;
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case -EPROBE_DEFER:
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return -EPROBE_DEFER;
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default:
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dev_err(&pdev->dev, "failed to get DP PWR regulator: %d\n", ret);
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return ret;
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}
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}
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if (conn->dp_pwr) {
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ret = regulator_enable(conn->dp_pwr);
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if (ret) {
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dev_err(&pdev->dev, "failed to enable DP PWR regulator: %d\n", ret);
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return ret;
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}
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}
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}
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conn->bridge.funcs = &display_connector_bridge_funcs;
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conn->bridge.of_node = pdev->dev.of_node;
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if (conn->bridge.ddc)
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conn->bridge.ops |= DRM_BRIDGE_OP_EDID
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| DRM_BRIDGE_OP_DETECT;
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if (conn->hpd_gpio)
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conn->bridge.ops |= DRM_BRIDGE_OP_DETECT;
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if (conn->hpd_irq >= 0)
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conn->bridge.ops |= DRM_BRIDGE_OP_HPD;
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dev_dbg(&pdev->dev,
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"Found %s display connector '%s' %s DDC bus and %s HPD GPIO (ops 0x%x)\n",
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drm_get_connector_type_name(conn->bridge.type),
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label ? label : "<unlabelled>",
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conn->bridge.ddc ? "with" : "without",
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conn->hpd_gpio ? "with" : "without",
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conn->bridge.ops);
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drm_bridge_add(&conn->bridge);
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return 0;
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}
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static int display_connector_remove(struct platform_device *pdev)
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{
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struct display_connector *conn = platform_get_drvdata(pdev);
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if (conn->dp_pwr)
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regulator_disable(conn->dp_pwr);
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drm_bridge_remove(&conn->bridge);
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if (!IS_ERR(conn->bridge.ddc))
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i2c_put_adapter(conn->bridge.ddc);
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return 0;
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}
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static const struct of_device_id display_connector_match[] = {
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{
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.compatible = "composite-video-connector",
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.data = (void *)DRM_MODE_CONNECTOR_Composite,
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}, {
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.compatible = "dvi-connector",
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.data = (void *)DRM_MODE_CONNECTOR_DVII,
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}, {
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.compatible = "hdmi-connector",
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.data = (void *)DRM_MODE_CONNECTOR_HDMIA,
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}, {
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.compatible = "svideo-connector",
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.data = (void *)DRM_MODE_CONNECTOR_SVIDEO,
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}, {
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.compatible = "vga-connector",
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.data = (void *)DRM_MODE_CONNECTOR_VGA,
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}, {
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.compatible = "dp-connector",
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.data = (void *)DRM_MODE_CONNECTOR_DisplayPort,
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, display_connector_match);
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static struct platform_driver display_connector_driver = {
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.probe = display_connector_probe,
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.remove = display_connector_remove,
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.driver = {
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.name = "display-connector",
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.of_match_table = display_connector_match,
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},
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};
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module_platform_driver(display_connector_driver);
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MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
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MODULE_DESCRIPTION("Display connector driver");
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MODULE_LICENSE("GPL");
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