--- /dev/null
+/*
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/backlight.h>
+#include <linux/gpio/consumer.h>
+#include <video/display_timing.h>
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
+
+#include "tilcdc_drv.h"
+
+struct panel_module {
+ struct tilcdc_module base;
+ struct tilcdc_panel_info *info;
+ struct display_timings *timings;
+ struct backlight_device *backlight;
+ struct gpio_desc *enable_gpio;
+};
+#define to_panel_module(x) container_of(x, struct panel_module, base)
+
+
+/*
+ * Encoder:
+ */
+
+struct panel_encoder {
+ struct drm_encoder base;
+ struct panel_module *mod;
+};
+#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
+
+
+static void panel_encoder_destroy(struct drm_encoder *encoder)
+{
+ struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
+ drm_encoder_cleanup(encoder);
+ kfree(panel_encoder);
+}
+
+static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+ struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
+ struct backlight_device *backlight = panel_encoder->mod->backlight;
+ struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
+
+ if (backlight) {
+ backlight->props.power = mode == DRM_MODE_DPMS_ON ?
+ FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+ backlight_update_status(backlight);
+ }
+
+ if (gpio)
+ gpiod_set_value_cansleep(gpio,
+ mode == DRM_MODE_DPMS_ON ? 1 : 0);
+}
+
+static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ /* nothing needed */
+ return true;
+}
+
+static void panel_encoder_prepare(struct drm_encoder *encoder)
+{
+ struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
+ panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
+ tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
+}
+
+static void panel_encoder_commit(struct drm_encoder *encoder)
+{
+ panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+
+static void panel_encoder_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ /* nothing needed */
+}
+
+static const struct drm_encoder_funcs panel_encoder_funcs = {
+ .destroy = panel_encoder_destroy,
+};
+
+static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
+ .dpms = panel_encoder_dpms,
+ .mode_fixup = panel_encoder_mode_fixup,
+ .prepare = panel_encoder_prepare,
+ .commit = panel_encoder_commit,
+ .mode_set = panel_encoder_mode_set,
+};
+
+static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
+ struct panel_module *mod)
+{
+ struct panel_encoder *panel_encoder;
+ struct drm_encoder *encoder;
+ int ret;
+
+ panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
+ if (!panel_encoder) {
+ dev_err(dev->dev, "allocation failed\n");
+ return NULL;
+ }
+
+ panel_encoder->mod = mod;
+
+ encoder = &panel_encoder->base;
+ encoder->possible_crtcs = 1;
+
+ ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
+ DRM_MODE_ENCODER_LVDS);
+ if (ret < 0)
+ goto fail;
+
+ drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
+
+ return encoder;
+
+fail:
+ panel_encoder_destroy(encoder);
+ return NULL;
+}
+
+/*
+ * Connector:
+ */
+
+struct panel_connector {
+ struct drm_connector base;
+
+ struct drm_encoder *encoder; /* our connected encoder */
+ struct panel_module *mod;
+};
+#define to_panel_connector(x) container_of(x, struct panel_connector, base)
+
+
+static void panel_connector_destroy(struct drm_connector *connector)
+{
+ struct panel_connector *panel_connector = to_panel_connector(connector);
+ drm_connector_unregister(connector);
+ drm_connector_cleanup(connector);
+ kfree(panel_connector);
+}
+
+static enum drm_connector_status panel_connector_detect(
+ struct drm_connector *connector,
+ bool force)
+{
+ return connector_status_connected;
+}
+
+static int panel_connector_get_modes(struct drm_connector *connector)
+{
+ struct drm_device *dev = connector->dev;
+ struct panel_connector *panel_connector = to_panel_connector(connector);
+ struct display_timings *timings = panel_connector->mod->timings;
+ int i;
+
+ for (i = 0; i < timings->num_timings; i++) {
+ struct drm_display_mode *mode = drm_mode_create(dev);
+ struct videomode vm;
+
+ if (videomode_from_timings(timings, &vm, i))
+ break;
+
+ drm_display_mode_from_videomode(&vm, mode);
+
+ mode->type = DRM_MODE_TYPE_DRIVER;
+
+ if (timings->native_mode == i)
+ mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+ drm_mode_set_name(mode);
+ drm_mode_probed_add(connector, mode);
+ }
+
+ return i;
+}
+
+static int panel_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct tilcdc_drm_private *priv = connector->dev->dev_private;
+ /* our only constraints are what the crtc can generate: */
+ return tilcdc_crtc_mode_valid(priv->crtc, mode);
+}
+
+static struct drm_encoder *panel_connector_best_encoder(
+ struct drm_connector *connector)
+{
+ struct panel_connector *panel_connector = to_panel_connector(connector);
+ return panel_connector->encoder;
+}
+
+static const struct drm_connector_funcs panel_connector_funcs = {
+ .destroy = panel_connector_destroy,
+ .dpms = drm_helper_connector_dpms,
+ .detect = panel_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+};
+
+static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
+ .get_modes = panel_connector_get_modes,
+ .mode_valid = panel_connector_mode_valid,
+ .best_encoder = panel_connector_best_encoder,
+};
+
+static struct drm_connector *panel_connector_create(struct drm_device *dev,
+ struct panel_module *mod, struct drm_encoder *encoder)
+{
+ struct panel_connector *panel_connector;
+ struct drm_connector *connector;
+ int ret;
+
+ panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
+ if (!panel_connector) {
+ dev_err(dev->dev, "allocation failed\n");
+ return NULL;
+ }
+
+ panel_connector->encoder = encoder;
+ panel_connector->mod = mod;
+
+ connector = &panel_connector->base;
+
+ drm_connector_init(dev, connector, &panel_connector_funcs,
+ DRM_MODE_CONNECTOR_LVDS);
+ drm_connector_helper_add(connector, &panel_connector_helper_funcs);
+
+ connector->interlace_allowed = 0;
+ connector->doublescan_allowed = 0;
+
+ ret = drm_mode_connector_attach_encoder(connector, encoder);
+ if (ret)
+ goto fail;
+
+ drm_connector_register(connector);
+
+ return connector;
+
+fail:
+ panel_connector_destroy(connector);
+ return NULL;
+}
+
+/*
+ * Module:
+ */
+
+static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
+{
+ struct panel_module *panel_mod = to_panel_module(mod);
+ struct tilcdc_drm_private *priv = dev->dev_private;
+ struct drm_encoder *encoder;
+ struct drm_connector *connector;
+
+ encoder = panel_encoder_create(dev, panel_mod);
+ if (!encoder)
+ return -ENOMEM;
+
+ connector = panel_connector_create(dev, panel_mod, encoder);
+ if (!connector)
+ return -ENOMEM;
+
+ priv->encoders[priv->num_encoders++] = encoder;
+ priv->connectors[priv->num_connectors++] = connector;
+
+ return 0;
+}
+
+static const struct tilcdc_module_ops panel_module_ops = {
+ .modeset_init = panel_modeset_init,
+};
+
+/*
+ * Device:
+ */
+
+/* maybe move this somewhere common if it is needed by other outputs? */
+static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
+{
+ struct device_node *info_np;
+ struct tilcdc_panel_info *info;
+ int ret = 0;
+
+ if (!np) {
+ pr_err("%s: no devicenode given\n", __func__);
+ return NULL;
+ }
+
+ info_np = of_get_child_by_name(np, "panel-info");
+ if (!info_np) {
+ pr_err("%s: could not find panel-info node\n", __func__);
+ return NULL;
+ }
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ pr_err("%s: allocation failed\n", __func__);
+ of_node_put(info_np);
+ return NULL;
+ }
+
+ ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
+ ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
+ ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
+ ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
+ ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
+ ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
+ ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
+ ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
+ ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
+
+ /* optional: */
+ info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
+ info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
+
+ if (ret) {
+ pr_err("%s: error reading panel-info properties\n", __func__);
+ kfree(info);
+ of_node_put(info_np);
+ return NULL;
+ }
+ of_node_put(info_np);
+
+ return info;
+}
+
+static int panel_probe(struct platform_device *pdev)
+{
+ struct device_node *bl_node, *node = pdev->dev.of_node;
+ struct panel_module *panel_mod;
+ struct tilcdc_module *mod;
+ struct pinctrl *pinctrl;
+ int ret;
+
+ /* bail out early if no DT data: */
+ if (!node) {
+ dev_err(&pdev->dev, "device-tree data is missing\n");
+ return -ENXIO;
+ }
+
+ panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
+ if (!panel_mod)
+ return -ENOMEM;
+
+ bl_node = of_parse_phandle(node, "backlight", 0);
+ if (bl_node) {
+ panel_mod->backlight = of_find_backlight_by_node(bl_node);
+ of_node_put(bl_node);
+
+ if (!panel_mod->backlight)
+ return -EPROBE_DEFER;
+
+ dev_info(&pdev->dev, "found backlight\n");
+ }
+
+ panel_mod->enable_gpio = devm_gpiod_get(&pdev->dev, "enable");
+ if (IS_ERR(panel_mod->enable_gpio)) {
+ ret = PTR_ERR(panel_mod->enable_gpio);
+ if (ret != -ENOENT) {
+ dev_err(&pdev->dev, "failed to request enable GPIO\n");
+ goto fail_backlight;
+ }
+
+ /* Optional GPIO is not here, continue silently. */
+ panel_mod->enable_gpio = NULL;
+ } else {
+ ret = gpiod_direction_output(panel_mod->enable_gpio, 0);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to setup GPIO\n");
+ goto fail_backlight;
+ }
+ dev_info(&pdev->dev, "found enable GPIO\n");
+ }
+
+ mod = &panel_mod->base;
+ pdev->dev.platform_data = mod;
+
+ tilcdc_module_init(mod, "panel", &panel_module_ops);
+
+ pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+ if (IS_ERR(pinctrl))
+ dev_warn(&pdev->dev, "pins are not configured\n");
+
+ panel_mod->timings = of_get_display_timings(node);
+ if (!panel_mod->timings) {
+ dev_err(&pdev->dev, "could not get panel timings\n");
+ ret = -EINVAL;
+ goto fail_free;
+ }
+
+ panel_mod->info = of_get_panel_info(node);
+ if (!panel_mod->info) {
+ dev_err(&pdev->dev, "could not get panel info\n");
+ ret = -EINVAL;
+ goto fail_timings;
+ }
+
+ mod->preferred_bpp = panel_mod->info->bpp;
+
+ return 0;
+
+fail_timings:
+ display_timings_release(panel_mod->timings);
+
+fail_free:
+ tilcdc_module_cleanup(mod);
+
+fail_backlight:
+ if (panel_mod->backlight)
+ put_device(&panel_mod->backlight->dev);
+ return ret;
+}
+
+static int panel_remove(struct platform_device *pdev)
+{
+ struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
+ struct panel_module *panel_mod = to_panel_module(mod);
+ struct backlight_device *backlight = panel_mod->backlight;
+
+ if (backlight)
+ put_device(&backlight->dev);
+
+ display_timings_release(panel_mod->timings);
+
+ tilcdc_module_cleanup(mod);
+ kfree(panel_mod->info);
+
+ return 0;
+}
+
+static struct of_device_id panel_of_match[] = {
+ { .compatible = "ti,tilcdc,panel", },
+ { },
+};
+
+struct platform_driver panel_driver = {
+ .probe = panel_probe,
+ .remove = panel_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "panel",
+ .of_match_table = panel_of_match,
+ },
+};
+
+int __init tilcdc_panel_init(void)
+{
+ return platform_driver_register(&panel_driver);
+}
+
+void __exit tilcdc_panel_fini(void)
+{
+ platform_driver_unregister(&panel_driver);
+}
Code Review / kvmfornfv.git / blobdiff