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c1530ac5a3
Kbuild complains about the lack of a license tag in this driver: WARNING: modpost: missing MODULE_LICENSE() in drivers/video/fbdev/mmp/mmp_disp.o This adds the license, author and description tags. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
257 lines
6.4 KiB
C
257 lines
6.4 KiB
C
/*
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* linux/drivers/video/mmp/common.c
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* This driver is a common framework for Marvell Display Controller
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*
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* Copyright (C) 2012 Marvell Technology Group Ltd.
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* Authors: Zhou Zhu <zzhu3@marvell.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <video/mmp_disp.h>
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static struct mmp_overlay *path_get_overlay(struct mmp_path *path,
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int overlay_id)
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{
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if (path && overlay_id < path->overlay_num)
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return &path->overlays[overlay_id];
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return NULL;
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}
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static int path_check_status(struct mmp_path *path)
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{
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int i;
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for (i = 0; i < path->overlay_num; i++)
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if (path->overlays[i].status)
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return 1;
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return 0;
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}
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/*
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* Get modelist write pointer of modelist.
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* It also returns modelist number
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* this function fetches modelist from phy/panel:
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* for HDMI/parallel or dsi to hdmi cases, get from phy
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* or get from panel
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*/
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static int path_get_modelist(struct mmp_path *path,
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struct mmp_mode **modelist)
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{
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BUG_ON(!path || !modelist);
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if (path->panel && path->panel->get_modelist)
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return path->panel->get_modelist(path->panel, modelist);
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return 0;
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}
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/*
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* panel list is used to pair panel/path when path/panel registered
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* path list is used for both buffer driver and platdriver
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* plat driver do path register/unregister
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* panel driver do panel register/unregister
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* buffer driver get registered path
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*/
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static LIST_HEAD(panel_list);
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static LIST_HEAD(path_list);
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static DEFINE_MUTEX(disp_lock);
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/*
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* mmp_register_panel - register panel to panel_list and connect to path
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* @p: panel to be registered
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*
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* this function provides interface for panel drivers to register panel
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* to panel_list and connect to path which matchs panel->plat_path_name.
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* no error returns when no matching path is found as path register after
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* panel register is permitted.
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*/
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void mmp_register_panel(struct mmp_panel *panel)
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{
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struct mmp_path *path;
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mutex_lock(&disp_lock);
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/* add */
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list_add_tail(&panel->node, &panel_list);
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/* try to register to path */
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list_for_each_entry(path, &path_list, node) {
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if (!strcmp(panel->plat_path_name, path->name)) {
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dev_info(panel->dev, "connect to path %s\n",
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path->name);
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path->panel = panel;
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break;
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}
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}
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mutex_unlock(&disp_lock);
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}
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EXPORT_SYMBOL_GPL(mmp_register_panel);
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/*
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* mmp_unregister_panel - unregister panel from panel_list and disconnect
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* @p: panel to be unregistered
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*
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* this function provides interface for panel drivers to unregister panel
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* from panel_list and disconnect from path.
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*/
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void mmp_unregister_panel(struct mmp_panel *panel)
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{
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struct mmp_path *path;
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mutex_lock(&disp_lock);
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list_del(&panel->node);
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list_for_each_entry(path, &path_list, node) {
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if (path->panel && path->panel == panel) {
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dev_info(panel->dev, "disconnect from path %s\n",
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path->name);
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path->panel = NULL;
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break;
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}
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}
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mutex_unlock(&disp_lock);
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}
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EXPORT_SYMBOL_GPL(mmp_unregister_panel);
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/*
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* mmp_get_path - get path by name
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* @p: path name
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*
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* this function checks path name in path_list and return matching path
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* return NULL if no matching path
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*/
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struct mmp_path *mmp_get_path(const char *name)
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{
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struct mmp_path *path;
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int found = 0;
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mutex_lock(&disp_lock);
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list_for_each_entry(path, &path_list, node) {
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if (!strcmp(name, path->name)) {
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found = 1;
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break;
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}
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}
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mutex_unlock(&disp_lock);
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return found ? path : NULL;
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}
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EXPORT_SYMBOL_GPL(mmp_get_path);
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/*
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* mmp_register_path - init and register path by path_info
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* @p: path info provided by display controller
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*
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* this function init by path info and register path to path_list
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* this function also try to connect path with panel by name
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*/
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struct mmp_path *mmp_register_path(struct mmp_path_info *info)
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{
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int i;
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size_t size;
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struct mmp_path *path = NULL;
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struct mmp_panel *panel;
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size = sizeof(struct mmp_path)
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+ sizeof(struct mmp_overlay) * info->overlay_num;
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path = kzalloc(size, GFP_KERNEL);
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if (!path)
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return NULL;
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/* path set */
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mutex_init(&path->access_ok);
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path->dev = info->dev;
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path->id = info->id;
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path->name = info->name;
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path->output_type = info->output_type;
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path->overlay_num = info->overlay_num;
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path->plat_data = info->plat_data;
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path->ops.set_mode = info->set_mode;
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mutex_lock(&disp_lock);
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/* get panel */
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list_for_each_entry(panel, &panel_list, node) {
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if (!strcmp(info->name, panel->plat_path_name)) {
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dev_info(path->dev, "get panel %s\n", panel->name);
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path->panel = panel;
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break;
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}
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}
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dev_info(path->dev, "register %s, overlay_num %d\n",
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path->name, path->overlay_num);
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/* default op set: if already set by driver, never cover it */
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if (!path->ops.check_status)
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path->ops.check_status = path_check_status;
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if (!path->ops.get_overlay)
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path->ops.get_overlay = path_get_overlay;
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if (!path->ops.get_modelist)
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path->ops.get_modelist = path_get_modelist;
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/* step3: init overlays */
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for (i = 0; i < path->overlay_num; i++) {
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path->overlays[i].path = path;
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path->overlays[i].id = i;
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mutex_init(&path->overlays[i].access_ok);
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path->overlays[i].ops = info->overlay_ops;
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}
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/* add to pathlist */
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list_add_tail(&path->node, &path_list);
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mutex_unlock(&disp_lock);
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return path;
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}
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EXPORT_SYMBOL_GPL(mmp_register_path);
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/*
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* mmp_unregister_path - unregister and destroy path
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* @p: path to be destroyed.
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*
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* this function registers path and destroys it.
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*/
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void mmp_unregister_path(struct mmp_path *path)
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{
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int i;
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if (!path)
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return;
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mutex_lock(&disp_lock);
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/* del from pathlist */
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list_del(&path->node);
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/* deinit overlays */
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for (i = 0; i < path->overlay_num; i++)
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mutex_destroy(&path->overlays[i].access_ok);
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mutex_destroy(&path->access_ok);
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kfree(path);
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mutex_unlock(&disp_lock);
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}
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EXPORT_SYMBOL_GPL(mmp_unregister_path);
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MODULE_AUTHOR("Zhou Zhu <zzhu3@marvell.com>");
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MODULE_DESCRIPTION("Marvell MMP display framework");
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MODULE_LICENSE("GPL");
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