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* S5P/EXYNOS4 SoC series camera host interface media device driver
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* Copyright (C) 2011 Samsung Electronics Co., Ltd.
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* Contact: Sylwester Nawrocki, <s.nawrocki@samsung.com>
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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 as published
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* by the Free Software Foundation, either version 2 of the License,
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* or (at your option) any later version.
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#include <linux/bug.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/version.h>
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#include <media/v4l2-ctrls.h>
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#include <media/media-device.h>
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#include "fimc-core.h"
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#include "fimc-mdevice.h"
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#include "mipi-csis.h"
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static int __fimc_md_set_camclk(struct fimc_md *fmd,
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struct fimc_sensor_info *s_info,
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* fimc_pipeline_prepare - update pipeline information with subdevice pointers
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* @fimc: fimc device terminating the pipeline
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* Caller holds the graph mutex.
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void fimc_pipeline_prepare(struct fimc_dev *fimc, struct media_entity *me)
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struct media_entity_graph graph;
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struct v4l2_subdev *sd;
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media_entity_graph_walk_start(&graph, me);
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while ((me = media_entity_graph_walk_next(&graph))) {
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if (media_entity_type(me) != MEDIA_ENT_T_V4L2_SUBDEV)
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sd = media_entity_to_v4l2_subdev(me);
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if (sd->grp_id == SENSOR_GROUP_ID)
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fimc->pipeline.sensor = sd;
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else if (sd->grp_id == CSIS_GROUP_ID)
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fimc->pipeline.csis = sd;
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* __subdev_set_power - change power state of a single subdev
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* @sd: subdevice to change power state for
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* @on: 1 to enable power or 0 to disable
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* Return result of s_power subdev operation or -ENXIO if sd argument
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* is NULL. Return 0 if the subdevice does not implement s_power.
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static int __subdev_set_power(struct v4l2_subdev *sd, int on)
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use_count = &sd->entity.use_count;
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if (on && (*use_count)++ > 0)
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else if (!on && (*use_count == 0 || --(*use_count) > 0))
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ret = v4l2_subdev_call(sd, core, s_power, on);
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return ret != -ENOIOCTLCMD ? ret : 0;
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* fimc_pipeline_s_power - change power state of all pipeline subdevs
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* @fimc: fimc device terminating the pipeline
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* @state: 1 to enable power or 0 for power down
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* Need to be called with the graph mutex held.
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int fimc_pipeline_s_power(struct fimc_dev *fimc, int state)
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if (fimc->pipeline.sensor == NULL)
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ret = __subdev_set_power(fimc->pipeline.csis, 1);
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if (ret && ret != -ENXIO)
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return __subdev_set_power(fimc->pipeline.sensor, 1);
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ret = __subdev_set_power(fimc->pipeline.sensor, 0);
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ret = __subdev_set_power(fimc->pipeline.csis, 0);
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return ret == -ENXIO ? 0 : ret;
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* __fimc_pipeline_initialize - update the pipeline information, enable power
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* of all pipeline subdevs and the sensor clock
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* @me: media entity to start graph walk with
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* @prep: true to acquire sensor (and csis) subdevs
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* This function must be called with the graph mutex held.
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static int __fimc_pipeline_initialize(struct fimc_dev *fimc,
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struct media_entity *me, bool prep)
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fimc_pipeline_prepare(fimc, me);
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if (fimc->pipeline.sensor == NULL)
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ret = fimc_md_set_camclk(fimc->pipeline.sensor, true);
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return fimc_pipeline_s_power(fimc, 1);
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int fimc_pipeline_initialize(struct fimc_dev *fimc, struct media_entity *me,
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mutex_lock(&me->parent->graph_mutex);
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ret = __fimc_pipeline_initialize(fimc, me, prep);
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mutex_unlock(&me->parent->graph_mutex);
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* __fimc_pipeline_shutdown - disable the sensor clock and pipeline power
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* @fimc: fimc device terminating the pipeline
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* Disable power of all subdevs in the pipeline and turn off the external
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* Called with the graph mutex held.
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int __fimc_pipeline_shutdown(struct fimc_dev *fimc)
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if (fimc->pipeline.sensor) {
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ret = fimc_pipeline_s_power(fimc, 0);
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fimc_md_set_camclk(fimc->pipeline.sensor, false);
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return ret == -ENXIO ? 0 : ret;
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int fimc_pipeline_shutdown(struct fimc_dev *fimc)
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struct media_entity *me = &fimc->vid_cap.vfd->entity;
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mutex_lock(&me->parent->graph_mutex);
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ret = __fimc_pipeline_shutdown(fimc);
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mutex_unlock(&me->parent->graph_mutex);
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* fimc_pipeline_s_stream - invoke s_stream on pipeline subdevs
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* @fimc: fimc device terminating the pipeline
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* @on: passed as the s_stream call argument
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int fimc_pipeline_s_stream(struct fimc_dev *fimc, int on)
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struct fimc_pipeline *p = &fimc->pipeline;
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if (p->sensor == NULL)
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if ((on && p->csis) || !on)
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ret = v4l2_subdev_call(on ? p->csis : p->sensor,
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video, s_stream, on);
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if (ret < 0 && ret != -ENOIOCTLCMD)
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if ((!on && p->csis) || on)
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ret = v4l2_subdev_call(on ? p->sensor : p->csis,
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video, s_stream, on);
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return ret == -ENOIOCTLCMD ? 0 : ret;
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* Sensor subdevice helper functions
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static struct v4l2_subdev *fimc_md_register_sensor(struct fimc_md *fmd,
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struct fimc_sensor_info *s_info)
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struct i2c_adapter *adapter;
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struct v4l2_subdev *sd = NULL;
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adapter = i2c_get_adapter(s_info->pdata->i2c_bus_num);
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sd = v4l2_i2c_new_subdev_board(&fmd->v4l2_dev, adapter,
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s_info->pdata->board_info, NULL);
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if (IS_ERR_OR_NULL(sd)) {
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i2c_put_adapter(adapter);
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v4l2_err(&fmd->v4l2_dev, "Failed to acquire subdev\n");
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v4l2_set_subdev_hostdata(sd, s_info);
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sd->grp_id = SENSOR_GROUP_ID;
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v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice %s\n",
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s_info->pdata->board_info->type);
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static void fimc_md_unregister_sensor(struct v4l2_subdev *sd)
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct i2c_adapter *adapter;
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v4l2_device_unregister_subdev(sd);
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adapter = client->adapter;
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i2c_unregister_device(client);
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i2c_put_adapter(adapter);
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static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
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struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
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struct fimc_dev *fd = NULL;
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int num_clients, ret, i;
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* Runtime resume one of the FIMC entities to make sure
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* the sclk_cam clocks are not globally disabled.
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for (i = 0; !fd && i < ARRAY_SIZE(fmd->fimc); i++)
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ret = pm_runtime_get_sync(&fd->pdev->dev);
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WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
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num_clients = min_t(u32, pdata->num_clients, ARRAY_SIZE(fmd->sensor));
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fmd->num_sensors = num_clients;
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for (i = 0; i < num_clients; i++) {
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fmd->sensor[i].pdata = &pdata->isp_info[i];
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ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], true);
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fmd->sensor[i].subdev =
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fimc_md_register_sensor(fmd, &fmd->sensor[i]);
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ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);
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pm_runtime_put(&fd->pdev->dev);
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* MIPI CSIS and FIMC platform devices registration.
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static int fimc_register_callback(struct device *dev, void *p)
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struct fimc_dev *fimc = dev_get_drvdata(dev);
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struct fimc_md *fmd = p;
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if (!fimc || !fimc->pdev)
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if (fimc->pdev->id < 0 || fimc->pdev->id >= FIMC_MAX_DEVS)
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fmd->fimc[fimc->pdev->id] = fimc;
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ret = fimc_register_m2m_device(fimc, &fmd->v4l2_dev);
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ret = fimc_register_capture_device(fimc, &fmd->v4l2_dev);
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fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
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static int csis_register_callback(struct device *dev, void *p)
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struct v4l2_subdev *sd = dev_get_drvdata(dev);
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struct platform_device *pdev;
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struct fimc_md *fmd = p;
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pdev = v4l2_get_subdevdata(sd);
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if (!pdev || pdev->id < 0 || pdev->id >= CSIS_MAX_ENTITIES)
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v4l2_info(sd, "csis%d sd: %s\n", pdev->id, sd->name);
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id = pdev->id < 0 ? 0 : pdev->id;
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fmd->csis[id].sd = sd;
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sd->grp_id = CSIS_GROUP_ID;
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ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
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v4l2_err(&fmd->v4l2_dev,
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"Failed to register CSIS subdevice: %d\n", ret);
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* fimc_md_register_platform_entities - register FIMC and CSIS media entities
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static int fimc_md_register_platform_entities(struct fimc_md *fmd)
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struct device_driver *driver;
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driver = driver_find(FIMC_MODULE_NAME, &platform_bus_type);
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ret = driver_for_each_device(driver, NULL, fmd,
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fimc_register_callback);
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driver = driver_find(CSIS_DRIVER_NAME, &platform_bus_type);
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ret = driver_for_each_device(driver, NULL, fmd,
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csis_register_callback);
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static void fimc_md_unregister_entities(struct fimc_md *fmd)
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for (i = 0; i < FIMC_MAX_DEVS; i++) {
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if (fmd->fimc[i] == NULL)
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fimc_unregister_m2m_device(fmd->fimc[i]);
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fimc_unregister_capture_device(fmd->fimc[i]);
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for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
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if (fmd->csis[i].sd == NULL)
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v4l2_device_unregister_subdev(fmd->csis[i].sd);
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fmd->csis[i].sd = NULL;
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for (i = 0; i < fmd->num_sensors; i++) {
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if (fmd->sensor[i].subdev == NULL)
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fimc_md_unregister_sensor(fmd->sensor[i].subdev);
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fmd->sensor[i].subdev = NULL;
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static int fimc_md_register_video_nodes(struct fimc_md *fmd)
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struct video_device *vdev;
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for (i = 0; i < FIMC_MAX_DEVS && !ret; i++) {
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vdev = fmd->fimc[i]->m2m.vfd;
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ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
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v4l2_info(&fmd->v4l2_dev, "Registered %s as /dev/%s\n",
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vdev->name, video_device_node_name(vdev));
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vdev = fmd->fimc[i]->vid_cap.vfd;
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ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
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v4l2_info(&fmd->v4l2_dev, "Registered %s as /dev/%s\n",
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vdev->name, video_device_node_name(vdev));
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* __fimc_md_create_fimc_links - create links to all FIMC entities
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* @fmd: fimc media device
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* @source: the source entity to create links to all fimc entities from
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* @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
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* @pad: the source entity pad index
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* @fimc_id: index of the fimc device for which link should be enabled
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static int __fimc_md_create_fimc_links(struct fimc_md *fmd,
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struct media_entity *source,
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struct v4l2_subdev *sensor,
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int pad, int fimc_id)
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struct fimc_sensor_info *s_info;
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struct media_entity *sink;
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for (i = 0; i < FIMC_MAX_DEVS; i++) {
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* Some FIMC variants are not fitted with camera capture
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* interface. Skip creating a link from sensor for those.
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if (sensor->grp_id == SENSOR_GROUP_ID &&
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!fmd->fimc[i]->variant->has_cam_if)
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flags = (i == fimc_id) ? MEDIA_LNK_FL_ENABLED : 0;
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sink = &fmd->fimc[i]->vid_cap.subdev->entity;
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ret = media_entity_create_link(source, pad, sink,
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FIMC_SD_PAD_SINK, flags);
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/* Notify FIMC capture subdev entity */
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ret = media_entity_call(sink, link_setup, &sink->pads[0],
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&source->pads[pad], flags);
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v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]",
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source->name, flags ? '=' : '-', sink->name);
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s_info = v4l2_get_subdev_hostdata(sensor);
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if (!WARN_ON(s_info == NULL)) {
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unsigned long irq_flags;
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spin_lock_irqsave(&fmd->slock, irq_flags);
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s_info->host = fmd->fimc[i];
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spin_unlock_irqrestore(&fmd->slock, irq_flags);
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* fimc_md_create_links - create default links between registered entities
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* Parallel interface sensor entities are connected directly to FIMC capture
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* entities. The sensors using MIPI CSIS bus are connected through immutable
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* link with CSI receiver entity specified by mux_id. Any registered CSIS
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* entity has a link to each registered FIMC capture entity. Enabled links
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* are created by default between each subsequent registered sensor and
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* subsequent FIMC capture entity. The number of default active links is
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* determined by the number of available sensors or FIMC entities,
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static int fimc_md_create_links(struct fimc_md *fmd)
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struct v4l2_subdev *sensor, *csis;
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struct s5p_fimc_isp_info *pdata;
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struct fimc_sensor_info *s_info;
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struct media_entity *source, *sink;
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int i, pad, fimc_id = 0;
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for (i = 0; i < fmd->num_sensors; i++) {
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if (fmd->sensor[i].subdev == NULL)
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sensor = fmd->sensor[i].subdev;
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s_info = v4l2_get_subdev_hostdata(sensor);
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if (!s_info || !s_info->pdata)
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pdata = s_info->pdata;
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switch (pdata->bus_type) {
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if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
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"Wrong CSI channel id: %d\n", pdata->mux_id))
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csis = fmd->csis[pdata->mux_id].sd;
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if (WARN(csis == NULL,
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"MIPI-CSI interface specified "
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"but s5p-csis module is not loaded!\n"))
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ret = media_entity_create_link(&sensor->entity, 0,
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&csis->entity, CSIS_PAD_SINK,
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MEDIA_LNK_FL_IMMUTABLE |
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MEDIA_LNK_FL_ENABLED);
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v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]",
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sensor->entity.name, csis->entity.name);
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source = &csis->entity;
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pad = CSIS_PAD_SOURCE;
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case FIMC_ITU_601...FIMC_ITU_656:
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source = &sensor->entity;
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v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
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ret = __fimc_md_create_fimc_links(fmd, source, sensor, pad,
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/* Create immutable links between each FIMC's subdev and video node */
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flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
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for (i = 0; i < FIMC_MAX_DEVS; i++) {
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source = &fmd->fimc[i]->vid_cap.subdev->entity;
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sink = &fmd->fimc[i]->vid_cap.vfd->entity;
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ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
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* The peripheral sensor clock management.
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static int fimc_md_get_clocks(struct fimc_md *fmd)
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for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
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snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
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clock = clk_get(NULL, clk_name);
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if (IS_ERR_OR_NULL(clock)) {
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v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s",
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fmd->camclk[i].clock = clock;
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static void fimc_md_put_clocks(struct fimc_md *fmd)
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int i = FIMC_MAX_CAMCLKS;
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if (IS_ERR_OR_NULL(fmd->camclk[i].clock))
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clk_put(fmd->camclk[i].clock);
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fmd->camclk[i].clock = NULL;
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static int __fimc_md_set_camclk(struct fimc_md *fmd,
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struct fimc_sensor_info *s_info,
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struct s5p_fimc_isp_info *pdata = s_info->pdata;
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struct fimc_camclk_info *camclk;
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if (WARN_ON(pdata->clk_id >= FIMC_MAX_CAMCLKS) || fmd == NULL)
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if (s_info->clk_on == on)
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camclk = &fmd->camclk[pdata->clk_id];
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dbg("camclk %d, f: %lu, clk: %p, on: %d",
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pdata->clk_id, pdata->clk_frequency, camclk, on);
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if (camclk->use_count > 0 &&
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camclk->frequency != pdata->clk_frequency)
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if (camclk->use_count++ == 0) {
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clk_set_rate(camclk->clock, pdata->clk_frequency);
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camclk->frequency = pdata->clk_frequency;
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ret = clk_enable(camclk->clock);
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dbg("Enabled camclk %d: f: %lu", pdata->clk_id,
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clk_get_rate(camclk->clock));
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if (WARN_ON(camclk->use_count == 0))
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if (--camclk->use_count == 0) {
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clk_disable(camclk->clock);
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dbg("Disabled camclk %d", pdata->clk_id);
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* fimc_md_set_camclk - peripheral sensor clock setup
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* @sd: sensor subdev to configure sclk_cam clock for
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* @on: 1 to enable or 0 to disable the clock
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* There are 2 separate clock outputs available in the SoC for external
651
* image processors. These clocks are shared between all registered FIMC
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* devices to which sensors can be attached, either directly or through
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* the MIPI CSI receiver. The clock is allowed here to be used by
654
* multiple sensors concurrently if they use same frequency.
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* The per sensor subdev clk_on attribute helps to synchronize accesses
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* to the sclk_cam clocks from the video and media device nodes.
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* This function should only be called when the graph mutex is held.
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int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
661
struct fimc_sensor_info *s_info = v4l2_get_subdev_hostdata(sd);
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struct fimc_md *fmd = entity_to_fimc_mdev(&sd->entity);
664
return __fimc_md_set_camclk(fmd, s_info, on);
667
static int fimc_md_link_notify(struct media_pad *source,
668
struct media_pad *sink, u32 flags)
670
struct v4l2_subdev *sd;
671
struct fimc_dev *fimc;
674
if (media_entity_type(sink->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
677
sd = media_entity_to_v4l2_subdev(sink->entity);
678
fimc = v4l2_get_subdevdata(sd);
680
if (!(flags & MEDIA_LNK_FL_ENABLED)) {
681
ret = __fimc_pipeline_shutdown(fimc);
682
fimc->pipeline.sensor = NULL;
683
fimc->pipeline.csis = NULL;
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mutex_lock(&fimc->lock);
686
fimc_ctrls_delete(fimc->vid_cap.ctx);
687
mutex_unlock(&fimc->lock);
691
* Link activation. Enable power of pipeline elements only if the
692
* pipeline is already in use, i.e. its video node is opened.
693
* Recreate the controls destroyed during the link deactivation.
695
mutex_lock(&fimc->lock);
696
if (fimc->vid_cap.refcnt > 0) {
697
ret = __fimc_pipeline_initialize(fimc, source->entity, true);
699
ret = fimc_capture_ctrls_create(fimc);
701
mutex_unlock(&fimc->lock);
703
return ret ? -EPIPE : ret;
706
static ssize_t fimc_md_sysfs_show(struct device *dev,
707
struct device_attribute *attr, char *buf)
709
struct platform_device *pdev = to_platform_device(dev);
710
struct fimc_md *fmd = platform_get_drvdata(pdev);
712
if (fmd->user_subdev_api)
713
return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);
715
return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
718
static ssize_t fimc_md_sysfs_store(struct device *dev,
719
struct device_attribute *attr,
720
const char *buf, size_t count)
722
struct platform_device *pdev = to_platform_device(dev);
723
struct fimc_md *fmd = platform_get_drvdata(pdev);
727
if (!strcmp(buf, "vid-dev\n"))
729
else if (!strcmp(buf, "sub-dev\n"))
734
fmd->user_subdev_api = subdev_api;
735
for (i = 0; i < FIMC_MAX_DEVS; i++)
737
fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
741
* This device attribute is to select video pipeline configuration method.
742
* There are following valid values:
743
* vid-dev - for V4L2 video node API only, subdevice will be configured
744
* by the host driver.
745
* sub-dev - for media controller API, subdevs must be configured in user
746
* space before starting streaming.
748
static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
749
fimc_md_sysfs_show, fimc_md_sysfs_store);
751
static int __devinit fimc_md_probe(struct platform_device *pdev)
753
struct v4l2_device *v4l2_dev;
757
fmd = kzalloc(sizeof(struct fimc_md), GFP_KERNEL);
761
spin_lock_init(&fmd->slock);
764
strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
765
sizeof(fmd->media_dev.model));
766
fmd->media_dev.link_notify = fimc_md_link_notify;
767
fmd->media_dev.dev = &pdev->dev;
769
v4l2_dev = &fmd->v4l2_dev;
770
v4l2_dev->mdev = &fmd->media_dev;
771
v4l2_dev->notify = fimc_sensor_notify;
772
snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s",
773
dev_name(&pdev->dev));
775
ret = v4l2_device_register(&pdev->dev, &fmd->v4l2_dev);
777
v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
780
ret = media_device_register(&fmd->media_dev);
782
v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
785
ret = fimc_md_get_clocks(fmd);
789
fmd->user_subdev_api = false;
790
ret = fimc_md_register_platform_entities(fmd);
794
if (pdev->dev.platform_data) {
795
ret = fimc_md_register_sensor_entities(fmd);
799
ret = fimc_md_create_links(fmd);
802
ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
805
ret = fimc_md_register_video_nodes(fmd);
809
ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
811
platform_set_drvdata(pdev, fmd);
815
media_device_unregister(&fmd->media_dev);
816
fimc_md_put_clocks(fmd);
817
fimc_md_unregister_entities(fmd);
819
v4l2_device_unregister(&fmd->v4l2_dev);
825
static int __devexit fimc_md_remove(struct platform_device *pdev)
827
struct fimc_md *fmd = platform_get_drvdata(pdev);
831
device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
832
fimc_md_unregister_entities(fmd);
833
media_device_unregister(&fmd->media_dev);
834
fimc_md_put_clocks(fmd);
839
static struct platform_driver fimc_md_driver = {
840
.probe = fimc_md_probe,
841
.remove = __devexit_p(fimc_md_remove),
843
.name = "s5p-fimc-md",
844
.owner = THIS_MODULE,
848
int __init fimc_md_init(void)
851
request_module("s5p-csis");
852
ret = fimc_register_driver();
855
return platform_driver_register(&fimc_md_driver);
857
void __exit fimc_md_exit(void)
859
platform_driver_unregister(&fimc_md_driver);
860
fimc_unregister_driver();
863
module_init(fimc_md_init);
864
module_exit(fimc_md_exit);
866
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
867
MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
868
MODULE_LICENSE("GPL");
869
MODULE_VERSION("2.0.1");