/* * 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/i2c.h> #include <linux/pinctrl/pinmux.h> #include <linux/pinctrl/consumer.h> #include <drm/drm_encoder_slave.h> #include "tilcdc_drv.h" struct slave_module { struct tilcdc_module base; struct i2c_adapter *i2c; }; #define to_slave_module(x) container_of(x, struct slave_module, base) static const struct tilcdc_panel_info slave_info = { .bpp = 16, .ac_bias = 255, .ac_bias_intrpt = 0, .dma_burst_sz = 16, .fdd = 0x80, .tft_alt_mode = 0, .sync_edge = 0, .sync_ctrl = 1, .raster_order = 0, }; /* * Encoder: */ struct slave_encoder { struct drm_encoder_slave base; struct slave_module *mod; }; #define to_slave_encoder(x) container_of(to_encoder_slave(x), struct slave_encoder, base) static inline struct drm_encoder_slave_funcs * get_slave_funcs(struct drm_encoder *enc) { return to_encoder_slave(enc)->slave_funcs; } static void slave_encoder_destroy(struct drm_encoder *encoder) { struct slave_encoder *slave_encoder = to_slave_encoder(encoder); if (get_slave_funcs(encoder)) get_slave_funcs(encoder)->destroy(encoder); drm_encoder_cleanup(encoder); kfree(slave_encoder); } static void slave_encoder_prepare(struct drm_encoder *encoder) { drm_i2c_encoder_prepare(encoder); tilcdc_crtc_set_panel_info(encoder->crtc, &slave_info); } static bool slave_encoder_fixup(struct drm_encoder *encoder, const struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode) { /* * tilcdc does not generate VESA-complient sync but aligns * VS on the second edge of HS instead of first edge. * We use adjusted_mode, to fixup sync by aligning both rising * edges and add HSKEW offset to let the slave encoder fix it up. */ adjusted_mode->hskew = mode->hsync_end - mode->hsync_start; adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW; if (mode->flags & DRM_MODE_FLAG_NHSYNC) { adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC; adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC; } else { adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC; adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC; } return drm_i2c_encoder_mode_fixup(encoder, mode, adjusted_mode); } static const struct drm_encoder_funcs slave_encoder_funcs = { .destroy = slave_encoder_destroy, }; static const struct drm_encoder_helper_funcs slave_encoder_helper_funcs = { .dpms = drm_i2c_encoder_dpms, .mode_fixup = slave_encoder_fixup, .prepare = slave_encoder_prepare, .commit = drm_i2c_encoder_commit, .mode_set = drm_i2c_encoder_mode_set, .save = drm_i2c_encoder_save, .restore = drm_i2c_encoder_restore, }; static const struct i2c_board_info info = { I2C_BOARD_INFO("tda998x", 0x70) }; static struct drm_encoder *slave_encoder_create(struct drm_device *dev, struct slave_module *mod) { struct slave_encoder *slave_encoder; struct drm_encoder *encoder; int ret; slave_encoder = kzalloc(sizeof(*slave_encoder), GFP_KERNEL); if (!slave_encoder) { dev_err(dev->dev, "allocation failed\n"); return NULL; } slave_encoder->mod = mod; encoder = &slave_encoder->base.base; encoder->possible_crtcs = 1; ret = drm_encoder_init(dev, encoder, &slave_encoder_funcs, DRM_MODE_ENCODER_TMDS); if (ret) goto fail; drm_encoder_helper_add(encoder, &slave_encoder_helper_funcs); ret = drm_i2c_encoder_init(dev, to_encoder_slave(encoder), mod->i2c, &info); if (ret) goto fail; return encoder; fail: slave_encoder_destroy(encoder); return NULL; } /* * Connector: */ struct slave_connector { struct drm_connector base; struct drm_encoder *encoder; /* our connected encoder */ struct slave_module *mod; }; #define to_slave_connector(x) container_of(x, struct slave_connector, base) static void slave_connector_destroy(struct drm_connector *connector) { struct slave_connector *slave_connector = to_slave_connector(connector); drm_connector_unregister(connector); drm_connector_cleanup(connector); kfree(slave_connector); } static enum drm_connector_status slave_connector_detect( struct drm_connector *connector, bool force) { struct drm_encoder *encoder = to_slave_connector(connector)->encoder; return get_slave_funcs(encoder)->detect(encoder, connector); } static int slave_connector_get_modes(struct drm_connector *connector) { struct drm_encoder *encoder = to_slave_connector(connector)->encoder; return get_slave_funcs(encoder)->get_modes(encoder, connector); } static int slave_connector_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) { struct drm_encoder *encoder = to_slave_connector(connector)->encoder; struct tilcdc_drm_private *priv = connector->dev->dev_private; int ret; ret = tilcdc_crtc_mode_valid(priv->crtc, mode); if (ret != MODE_OK) return ret; return get_slave_funcs(encoder)->mode_valid(encoder, mode); } static struct drm_encoder *slave_connector_best_encoder( struct drm_connector *connector) { struct slave_connector *slave_connector = to_slave_connector(connector); return slave_connector->encoder; } static int slave_connector_set_property(struct drm_connector *connector, struct drm_property *property, uint64_t value) { struct drm_encoder *encoder = to_slave_connector(connector)->encoder; return get_slave_funcs(encoder)->set_property(encoder, connector, property, value); } static const struct drm_connector_funcs slave_connector_funcs = { .destroy = slave_connector_destroy, .dpms = drm_helper_connector_dpms, .detect = slave_connector_detect, .fill_modes = drm_helper_probe_single_connector_modes, .set_property = slave_connector_set_property, }; static const struct drm_connector_helper_funcs slave_connector_helper_funcs = { .get_modes = slave_connector_get_modes, .mode_valid = slave_connector_mode_valid, .best_encoder = slave_connector_best_encoder, }; static struct drm_connector *slave_connector_create(struct drm_device *dev, struct slave_module *mod, struct drm_encoder *encoder) { struct slave_connector *slave_connector; struct drm_connector *connector; int ret; slave_connector = kzalloc(sizeof(*slave_connector), GFP_KERNEL); if (!slave_connector) { dev_err(dev->dev, "allocation failed\n"); return NULL; } slave_connector->encoder = encoder; slave_connector->mod = mod; connector = &slave_connector->base; drm_connector_init(dev, connector, &slave_connector_funcs, DRM_MODE_CONNECTOR_HDMIA); drm_connector_helper_add(connector, &slave_connector_helper_funcs); connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; connector->interlace_allowed = 0; connector->doublescan_allowed = 0; get_slave_funcs(encoder)->create_resources(encoder, connector); ret = drm_mode_connector_attach_encoder(connector, encoder); if (ret) goto fail; drm_connector_register(connector); return connector; fail: slave_connector_destroy(connector); return NULL; } /* * Module: */ static int slave_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) { struct slave_module *slave_mod = to_slave_module(mod); struct tilcdc_drm_private *priv = dev->dev_private; struct drm_encoder *encoder; struct drm_connector *connector; encoder = slave_encoder_create(dev, slave_mod); if (!encoder) return -ENOMEM; connector = slave_connector_create(dev, slave_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 slave_module_ops = { .modeset_init = slave_modeset_init, }; /* * Device: */ static struct of_device_id slave_of_match[]; static int slave_probe(struct platform_device *pdev) { struct device_node *node = pdev->dev.of_node; struct device_node *i2c_node; struct slave_module *slave_mod; struct tilcdc_module *mod; struct pinctrl *pinctrl; uint32_t i2c_phandle; struct i2c_adapter *slavei2c; int ret = -EINVAL; /* bail out early if no DT data: */ if (!node) { dev_err(&pdev->dev, "device-tree data is missing\n"); return -ENXIO; } /* Bail out early if i2c not specified */ if (of_property_read_u32(node, "i2c", &i2c_phandle)) { dev_err(&pdev->dev, "could not get i2c bus phandle\n"); return ret; } i2c_node = of_find_node_by_phandle(i2c_phandle); if (!i2c_node) { dev_err(&pdev->dev, "could not get i2c bus node\n"); return ret; } /* but defer the probe if it can't be initialized it might come later */ slavei2c = of_find_i2c_adapter_by_node(i2c_node); of_node_put(i2c_node); if (!slavei2c) { ret = -EPROBE_DEFER; tilcdc_slave_probedefer(true); dev_err(&pdev->dev, "could not get i2c\n"); return ret; } slave_mod = kzalloc(sizeof(*slave_mod), GFP_KERNEL); if (!slave_mod) { ret = -ENOMEM; goto fail_adapter; } mod = &slave_mod->base; pdev->dev.platform_data = mod; mod->preferred_bpp = slave_info.bpp; slave_mod->i2c = slavei2c; tilcdc_module_init(mod, "slave", &slave_module_ops); pinctrl = devm_pinctrl_get_select_default(&pdev->dev); if (IS_ERR(pinctrl)) dev_warn(&pdev->dev, "pins are not configured\n"); tilcdc_slave_probedefer(false); return 0; fail_adapter: i2c_put_adapter(slavei2c); return ret; } static int slave_remove(struct platform_device *pdev) { struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); struct slave_module *slave_mod = to_slave_module(mod); tilcdc_module_cleanup(mod); kfree(slave_mod); return 0; } static struct of_device_id slave_of_match[] = { { .compatible = "ti,tilcdc,slave", }, { }, }; struct platform_driver slave_driver = { .probe = slave_probe, .remove = slave_remove, .driver = { .owner = THIS_MODULE, .name = "slave", .of_match_table = slave_of_match, }, }; int __init tilcdc_slave_init(void) { return platform_driver_register(&slave_driver); } void __exit tilcdc_slave_fini(void) { platform_driver_unregister(&slave_driver); }