273 lines
6.3 KiB
C
273 lines
6.3 KiB
C
/*
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* Copyright (C) 2012 Avionic Design GmbH
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* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/i2c.h>
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#include "drm.h"
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static int tegra_connector_get_modes(struct drm_connector *connector)
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{
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struct tegra_output *output = connector_to_output(connector);
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struct edid *edid = NULL;
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int err = 0;
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if (output->edid)
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edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
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else if (output->ddc)
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edid = drm_get_edid(connector, output->ddc);
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drm_mode_connector_update_edid_property(connector, edid);
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if (edid) {
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err = drm_add_edid_modes(connector, edid);
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kfree(edid);
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}
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return err;
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}
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static int tegra_connector_mode_valid(struct drm_connector *connector,
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struct drm_display_mode *mode)
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{
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struct tegra_output *output = connector_to_output(connector);
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enum drm_mode_status status = MODE_OK;
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int err;
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err = tegra_output_check_mode(output, mode, &status);
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if (err < 0)
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return MODE_ERROR;
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return status;
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}
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static struct drm_encoder *
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tegra_connector_best_encoder(struct drm_connector *connector)
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{
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struct tegra_output *output = connector_to_output(connector);
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return &output->encoder;
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}
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static const struct drm_connector_helper_funcs connector_helper_funcs = {
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.get_modes = tegra_connector_get_modes,
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.mode_valid = tegra_connector_mode_valid,
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.best_encoder = tegra_connector_best_encoder,
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};
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static enum drm_connector_status
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tegra_connector_detect(struct drm_connector *connector, bool force)
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{
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struct tegra_output *output = connector_to_output(connector);
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enum drm_connector_status status = connector_status_unknown;
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if (gpio_is_valid(output->hpd_gpio)) {
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if (gpio_get_value(output->hpd_gpio) == 0)
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status = connector_status_disconnected;
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else
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status = connector_status_connected;
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} else {
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if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
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status = connector_status_connected;
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}
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return status;
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}
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static void tegra_connector_destroy(struct drm_connector *connector)
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{
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drm_sysfs_connector_remove(connector);
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drm_connector_cleanup(connector);
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}
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static const struct drm_connector_funcs connector_funcs = {
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.dpms = drm_helper_connector_dpms,
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.detect = tegra_connector_detect,
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.fill_modes = drm_helper_probe_single_connector_modes,
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.destroy = tegra_connector_destroy,
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};
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static void tegra_encoder_destroy(struct drm_encoder *encoder)
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{
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drm_encoder_cleanup(encoder);
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}
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static const struct drm_encoder_funcs encoder_funcs = {
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.destroy = tegra_encoder_destroy,
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};
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static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
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{
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}
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static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
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const struct drm_display_mode *mode,
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struct drm_display_mode *adjusted)
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{
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return true;
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}
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static void tegra_encoder_prepare(struct drm_encoder *encoder)
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{
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}
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static void tegra_encoder_commit(struct drm_encoder *encoder)
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{
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}
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static void tegra_encoder_mode_set(struct drm_encoder *encoder,
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struct drm_display_mode *mode,
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struct drm_display_mode *adjusted)
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{
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struct tegra_output *output = encoder_to_output(encoder);
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int err;
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err = tegra_output_enable(output);
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if (err < 0)
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dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err);
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}
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static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
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.dpms = tegra_encoder_dpms,
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.mode_fixup = tegra_encoder_mode_fixup,
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.prepare = tegra_encoder_prepare,
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.commit = tegra_encoder_commit,
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.mode_set = tegra_encoder_mode_set,
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};
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static irqreturn_t hpd_irq(int irq, void *data)
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{
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struct tegra_output *output = data;
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drm_helper_hpd_irq_event(output->connector.dev);
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return IRQ_HANDLED;
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}
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int tegra_output_parse_dt(struct tegra_output *output)
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{
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enum of_gpio_flags flags;
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struct device_node *ddc;
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size_t size;
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int err;
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if (!output->of_node)
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output->of_node = output->dev->of_node;
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output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
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ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
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if (ddc) {
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output->ddc = of_find_i2c_adapter_by_node(ddc);
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if (!output->ddc) {
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err = -EPROBE_DEFER;
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of_node_put(ddc);
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return err;
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}
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of_node_put(ddc);
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}
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if (!output->edid && !output->ddc)
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return -ENODEV;
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output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
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"nvidia,hpd-gpio", 0,
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&flags);
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return 0;
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}
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int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
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{
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int connector, encoder, err;
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if (gpio_is_valid(output->hpd_gpio)) {
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unsigned long flags;
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err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
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"HDMI hotplug detect");
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if (err < 0) {
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dev_err(output->dev, "gpio_request_one(): %d\n", err);
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return err;
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}
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err = gpio_to_irq(output->hpd_gpio);
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if (err < 0) {
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dev_err(output->dev, "gpio_to_irq(): %d\n", err);
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goto free_hpd;
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}
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output->hpd_irq = err;
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flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT;
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err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
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flags, "hpd", output);
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if (err < 0) {
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dev_err(output->dev, "failed to request IRQ#%u: %d\n",
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output->hpd_irq, err);
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goto free_hpd;
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}
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output->connector.polled = DRM_CONNECTOR_POLL_HPD;
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}
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switch (output->type) {
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case TEGRA_OUTPUT_RGB:
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connector = DRM_MODE_CONNECTOR_LVDS;
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encoder = DRM_MODE_ENCODER_LVDS;
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break;
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case TEGRA_OUTPUT_HDMI:
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connector = DRM_MODE_CONNECTOR_HDMIA;
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encoder = DRM_MODE_ENCODER_TMDS;
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break;
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default:
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connector = DRM_MODE_CONNECTOR_Unknown;
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encoder = DRM_MODE_ENCODER_NONE;
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break;
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}
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drm_connector_init(drm, &output->connector, &connector_funcs,
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connector);
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drm_connector_helper_add(&output->connector, &connector_helper_funcs);
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drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
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drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);
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drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
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drm_sysfs_connector_add(&output->connector);
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output->encoder.possible_crtcs = 0x3;
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return 0;
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free_hpd:
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gpio_free(output->hpd_gpio);
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return err;
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}
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int tegra_output_exit(struct tegra_output *output)
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{
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if (gpio_is_valid(output->hpd_gpio)) {
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free_irq(output->hpd_irq, output);
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gpio_free(output->hpd_gpio);
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}
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if (output->ddc)
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put_device(&output->ddc->dev);
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return 0;
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}
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