drivers/staging/media/davinci_vpfe/vpfe_mc_capture.c

/*
 * Copyright (C) 2012 Texas Instruments Inc
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * Contributors:
 *      Manjunath Hadli <manjunath.hadli@ti.com>
 *      Prabhakar Lad <prabhakar.lad@ti.com>
 *
 *
 * Driver name : VPFE Capture driver
 *    VPFE Capture driver allows applications to capture and stream video
 *    frames on DaVinci SoCs (DM6446, DM355 etc) from a YUV source such as
 *    TVP5146 or  Raw Bayer RGB image data from an image sensor
 *    such as Microns' MT9T001, MT9T031 etc.
 *
 *    These SoCs have, in common, a Video Processing Subsystem (VPSS) that
 *    consists of a Video Processing Front End (VPFE) for capturing
 *    video/raw image data and Video Processing Back End (VPBE) for displaying
 *    YUV data through an in-built analog encoder or Digital LCD port. This
 *    driver is for capture through VPFE. A typical EVM using these SoCs have
 *    following high level configuration.
 *
 *    decoder(TVP5146/		YUV/
 *	MT9T001)   -->  Raw Bayer RGB ---> MUX -> VPFE (CCDC/ISIF)
 *			data input              |      |
 *							V      |
 *						      SDRAM    |
 *							       V
 *							   Image Processor
 *							       |
 *							       V
 *							     SDRAM
 *    The data flow happens from a decoder connected to the VPFE over a
 *    YUV embedded (BT.656/BT.1120) or separate sync or raw bayer rgb interface
 *    and to the input of VPFE through an optional MUX (if more inputs are
 *    to be interfaced on the EVM). The input data is first passed through
 *    CCDC (CCD Controller, a.k.a Image Sensor Interface, ISIF). The CCDC
 *    does very little or no processing on YUV data and does pre-process Raw
 *    Bayer RGB data through modules such as Defect Pixel Correction (DFC)
 *    Color Space Conversion (CSC), data gain/offset etc. After this, data
 *    can be written to SDRAM or can be connected to the image processing
 *    block such as IPIPE (on DM355/DM365 only).
 *
 *    Features supported
 *		- MMAP IO
 *		- USERPTR IO
 *		- Capture using TVP5146 over BT.656
 *		- Support for interfacing decoders using sub device model
 *		- Work with DM365 or DM355 or DM6446 CCDC to do Raw Bayer
 *		  RGB/YUV data capture to SDRAM.
 *		- Chaining of Image Processor
 *		- SINGLE-SHOT mode
 */

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>

#include "vpfe.h"
#include "vpfe_mc_capture.h"

static bool debug;
static bool interface;

module_param(interface, bool, S_IRUGO);
module_param(debug, bool, 0644);

/**
 * VPFE capture can be used for capturing video such as from TVP5146 or TVP7002
 * and for capture raw bayer data from camera sensors such as mt9p031. At this
 * point there is problem in co-existence of mt9p031 and tvp5146 due to i2c
 * address collision. So set the variable below from bootargs to do either video
 * capture or camera capture.
 * interface = 0 - video capture (from TVP514x or such),
 * interface = 1 - Camera capture (from mt9p031 or such)
 * Re-visit this when we fix the co-existence issue
 */
MODULE_PARM_DESC(interface, "interface 0-1 (default:0)");
MODULE_PARM_DESC(debug, "Debug level 0-1");

MODULE_DESCRIPTION("VPFE Video for Linux Capture Driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Texas Instruments");

/* map mbus_fmt to pixelformat */
void mbus_to_pix(const struct v4l2_mbus_framefmt *mbus,
			   struct v4l2_pix_format *pix)
{
	switch (mbus->code) {
	case MEDIA_BUS_FMT_UYVY8_2X8:
		pix->pixelformat = V4L2_PIX_FMT_UYVY;
		pix->bytesperline = pix->width * 2;
		break;

	case MEDIA_BUS_FMT_YUYV8_2X8:
		pix->pixelformat = V4L2_PIX_FMT_YUYV;
		pix->bytesperline = pix->width * 2;
		break;

	case MEDIA_BUS_FMT_YUYV10_1X20:
		pix->pixelformat = V4L2_PIX_FMT_UYVY;
		pix->bytesperline = pix->width * 2;
		break;

	case MEDIA_BUS_FMT_SGRBG12_1X12:
		pix->pixelformat = V4L2_PIX_FMT_SBGGR16;
		pix->bytesperline = pix->width * 2;
		break;

	case MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8:
		pix->pixelformat = V4L2_PIX_FMT_SGRBG10DPCM8;
		pix->bytesperline = pix->width;
		break;

	case MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8:
		pix->pixelformat = V4L2_PIX_FMT_SGRBG10ALAW8;
		pix->bytesperline = pix->width;
		break;

	case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
		pix->pixelformat = V4L2_PIX_FMT_NV12;
		pix->bytesperline = pix->width;
		break;

	case MEDIA_BUS_FMT_Y8_1X8:
		pix->pixelformat = V4L2_PIX_FMT_GREY;
		pix->bytesperline = pix->width;
		break;

	case MEDIA_BUS_FMT_UV8_1X8:
		pix->pixelformat = V4L2_PIX_FMT_UV8;
		pix->bytesperline = pix->width;
		break;

	default:
		pr_err("Invalid mbus code set\n");
	}
	/* pitch should be 32 bytes aligned */
	pix->bytesperline = ALIGN(pix->bytesperline, 32);
	if (pix->pixelformat == V4L2_PIX_FMT_NV12)
		pix->sizeimage = pix->bytesperline * pix->height +
				((pix->bytesperline * pix->height) >> 1);
	else
		pix->sizeimage = pix->bytesperline * pix->height;
}

/* ISR for VINT0*/
static irqreturn_t vpfe_isr(int irq, void *dev_id)
{
	struct vpfe_device *vpfe_dev = dev_id;

	v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_isr\n");
	vpfe_isif_buffer_isr(&vpfe_dev->vpfe_isif);
	vpfe_resizer_buffer_isr(&vpfe_dev->vpfe_resizer);
	return IRQ_HANDLED;
}

/* vpfe_vdint1_isr() - isr handler for VINT1 interrupt */
static irqreturn_t vpfe_vdint1_isr(int irq, void *dev_id)
{
	struct vpfe_device *vpfe_dev = dev_id;

	v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_vdint1_isr\n");
	vpfe_isif_vidint1_isr(&vpfe_dev->vpfe_isif);
	return IRQ_HANDLED;
}

/* vpfe_imp_dma_isr() - ISR for ipipe dma completion */
static irqreturn_t vpfe_imp_dma_isr(int irq, void *dev_id)
{
	struct vpfe_device *vpfe_dev = dev_id;

	v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_imp_dma_isr\n");
	vpfe_ipipeif_ss_buffer_isr(&vpfe_dev->vpfe_ipipeif);
	vpfe_resizer_dma_isr(&vpfe_dev->vpfe_resizer);
	return IRQ_HANDLED;
}

/*
 * vpfe_disable_clock() - Disable clocks for vpfe capture driver
 * @vpfe_dev - ptr to vpfe capture device
 *
 * Disables clocks defined in vpfe configuration. The function
 * assumes that at least one clock is to be defined which is
 * true as of now.
 */
static void vpfe_disable_clock(struct vpfe_device *vpfe_dev)
{
	struct vpfe_config *vpfe_cfg = vpfe_dev->cfg;
	int i;

	for (i = 0; i < vpfe_cfg->num_clocks; i++) {
		clk_disable_unprepare(vpfe_dev->clks[i]);
		clk_put(vpfe_dev->clks[i]);
	}
	kzfree(vpfe_dev->clks);
	v4l2_info(vpfe_dev->pdev->driver, "vpfe capture clocks disabled\n");
}

/*
 * vpfe_enable_clock() - Enable clocks for vpfe capture driver
 * @vpfe_dev - ptr to vpfe capture device
 *
 * Enables clocks defined in vpfe configuration. The function
 * assumes that at least one clock is to be defined which is
 * true as of now.
 */
static int vpfe_enable_clock(struct vpfe_device *vpfe_dev)
{
	struct vpfe_config *vpfe_cfg = vpfe_dev->cfg;
	int ret = -EFAULT;
	int i;

	if (!vpfe_cfg->num_clocks)
		return 0;

	vpfe_dev->clks = kcalloc(vpfe_cfg->num_clocks,
				 sizeof(struct clock *), GFP_KERNEL);
	if (vpfe_dev->clks == NULL)
		return -ENOMEM;

	for (i = 0; i < vpfe_cfg->num_clocks; i++) {
		if (vpfe_cfg->clocks[i] == NULL) {
			v4l2_err(vpfe_dev->pdev->driver,
				"clock %s is not defined in vpfe config\n",
				vpfe_cfg->clocks[i]);
			goto out;
		}

		vpfe_dev->clks[i] =
				clk_get(vpfe_dev->pdev, vpfe_cfg->clocks[i]);
		if (IS_ERR(vpfe_dev->clks[i])) {
			v4l2_err(vpfe_dev->pdev->driver,
				"Failed to get clock %s\n",
				vpfe_cfg->clocks[i]);
			goto out;
		}

		if (clk_prepare_enable(vpfe_dev->clks[i])) {
			v4l2_err(vpfe_dev->pdev->driver,
				"vpfe clock %s not enabled\n",
				vpfe_cfg->clocks[i]);
			goto out;
		}

		v4l2_info(vpfe_dev->pdev->driver, "vpss clock %s enabled",
			  vpfe_cfg->clocks[i]);
	}

	return 0;
out:
	for (i = 0; i < vpfe_cfg->num_clocks; i++)
		if (!IS_ERR(vpfe_dev->clks[i])) {
			clk_disable_unprepare(vpfe_dev->clks[i]);
			clk_put(vpfe_dev->clks[i]);
		}

	v4l2_err(vpfe_dev->pdev->driver, "Failed to enable clocks\n");
	kzfree(vpfe_dev->clks);

	return ret;
}

/*
 * vpfe_detach_irq() - Detach IRQs for vpfe capture driver
 * @vpfe_dev - ptr to vpfe capture device
 *
 * Detach all IRQs defined in vpfe configuration.
 */
static void vpfe_detach_irq(struct vpfe_device *vpfe_dev)
{
	free_irq(vpfe_dev->ccdc_irq0, vpfe_dev);
	free_irq(vpfe_dev->ccdc_irq1, vpfe_dev);
	free_irq(vpfe_dev->imp_dma_irq, vpfe_dev);
}

/*
 * vpfe_attach_irq() - Attach IRQs for vpfe capture driver
 * @vpfe_dev - ptr to vpfe capture device
 *
 * Attach all IRQs defined in vpfe configuration.
 */
static int vpfe_attach_irq(struct vpfe_device *vpfe_dev)
{
	int ret;

	ret = request_irq(vpfe_dev->ccdc_irq0, vpfe_isr, 0,
			  "vpfe_capture0", vpfe_dev);
	if (ret < 0) {
		v4l2_err(&vpfe_dev->v4l2_dev,
			"Error: requesting VINT0 interrupt\n");
		return ret;
	}

	ret = request_irq(vpfe_dev->ccdc_irq1, vpfe_vdint1_isr, 0,
			  "vpfe_capture1", vpfe_dev);
	if (ret < 0) {
		v4l2_err(&vpfe_dev->v4l2_dev,
			"Error: requesting VINT1 interrupt\n");
		free_irq(vpfe_dev->ccdc_irq0, vpfe_dev);
		return ret;
	}

	ret = request_irq(vpfe_dev->imp_dma_irq, vpfe_imp_dma_isr,
			  0, "Imp_Sdram_Irq", vpfe_dev);
	if (ret < 0) {
		v4l2_err(&vpfe_dev->v4l2_dev,
			 "Error: requesting IMP IRQ interrupt\n");
		free_irq(vpfe_dev->ccdc_irq1, vpfe_dev);
		free_irq(vpfe_dev->ccdc_irq0, vpfe_dev);
		return ret;
	}

	return 0;
}

/*
 * register_i2c_devices() - register all i2c v4l2 subdevs
 * @vpfe_dev - ptr to vpfe capture device
 *
 * register all i2c v4l2 subdevs
 */
static int register_i2c_devices(struct vpfe_device *vpfe_dev)
{
	struct vpfe_ext_subdev_info *sdinfo;
	struct vpfe_config *vpfe_cfg;
	struct i2c_adapter *i2c_adap;
	unsigned int num_subdevs;
	int ret;
	int i;
	int k;

	vpfe_cfg = vpfe_dev->cfg;
	i2c_adap = i2c_get_adapter(1);
	num_subdevs = vpfe_cfg->num_subdevs;
	vpfe_dev->sd =
		  kcalloc(num_subdevs, sizeof(struct v4l2_subdev *),
			  GFP_KERNEL);
	if (vpfe_dev->sd == NULL)
		return -ENOMEM;

	for (i = 0, k = 0; i < num_subdevs; i++) {
		sdinfo = &vpfe_cfg->sub_devs[i];
		/*
		 * register subdevices based on interface setting. Currently
		 * tvp5146 and mt9p031 cannot co-exists due to i2c address
		 * conflicts. So only one of them is registered. Re-visit this
		 * once we have support for i2c switch handling in i2c driver
		 * framework
		 */
		if (interface == sdinfo->is_camera) {
			/* setup input path */
			if (vpfe_cfg->setup_input &&
				vpfe_cfg->setup_input(sdinfo->grp_id) < 0) {
				ret = -EFAULT;
				v4l2_info(&vpfe_dev->v4l2_dev,
					  "could not setup input for %s\n",
						sdinfo->module_name);
				goto probe_sd_out;
			}
			/* Load up the subdevice */
			vpfe_dev->sd[k] =
				v4l2_i2c_new_subdev_board(&vpfe_dev->v4l2_dev,
						  i2c_adap, &sdinfo->board_info,
						  NULL);
			if (vpfe_dev->sd[k]) {
				v4l2_info(&vpfe_dev->v4l2_dev,
						"v4l2 sub device %s registered\n",
						sdinfo->module_name);

				vpfe_dev->sd[k]->grp_id = sdinfo->grp_id;
				k++;

				sdinfo->registered = 1;
			}
		} else {
			v4l2_info(&vpfe_dev->v4l2_dev,
				  "v4l2 sub device %s is not registered\n",
				  sdinfo->module_name);
		}
	}
	vpfe_dev->num_ext_subdevs = k;

	return 0;

probe_sd_out:
	kzfree(vpfe_dev->sd);

	return ret;
}

/*
 * vpfe_register_entities() - register all v4l2 subdevs and media entities
 * @vpfe_dev - ptr to vpfe capture device
 *
 * register all v4l2 subdevs, media entities, and creates links
 * between entities
 */
static int vpfe_register_entities(struct vpfe_device *vpfe_dev)
{
	unsigned int flags = 0;
	int ret;
	int i;

	/* register i2c devices first */
	ret = register_i2c_devices(vpfe_dev);
	if (ret)
		return ret;

	/* register rest of the sub-devs */
	ret = vpfe_isif_register_entities(&vpfe_dev->vpfe_isif,
					  &vpfe_dev->v4l2_dev);
	if (ret)
		return ret;

	ret = vpfe_ipipeif_register_entities(&vpfe_dev->vpfe_ipipeif,
					     &vpfe_dev->v4l2_dev);
	if (ret)
		goto out_isif_register;

	ret = vpfe_ipipe_register_entities(&vpfe_dev->vpfe_ipipe,
					   &vpfe_dev->v4l2_dev);
	if (ret)
		goto out_ipipeif_register;

	ret = vpfe_resizer_register_entities(&vpfe_dev->vpfe_resizer,
					     &vpfe_dev->v4l2_dev);
	if (ret)
		goto out_ipipe_register;

	/* create links now, starting with external(i2c) entities */
	for (i = 0; i < vpfe_dev->num_ext_subdevs; i++)
		/* if entity has no pads (ex: amplifier),
		   cant establish link */
		if (vpfe_dev->sd[i]->entity.num_pads) {
			ret = media_entity_create_link(&vpfe_dev->sd[i]->entity,
				0, &vpfe_dev->vpfe_isif.subdev.entity,
				0, flags);
			if (ret < 0)
				goto out_resizer_register;
		}

	ret = media_entity_create_link(&vpfe_dev->vpfe_isif.subdev.entity, 1,
				       &vpfe_dev->vpfe_ipipeif.subdev.entity,
				       0, flags);
	if (ret < 0)
		goto out_resizer_register;

	ret = media_entity_create_link(&vpfe_dev->vpfe_ipipeif.subdev.entity, 1,
				       &vpfe_dev->vpfe_ipipe.subdev.entity,
				       0, flags);
	if (ret < 0)
		goto out_resizer_register;

	ret = media_entity_create_link(&vpfe_dev->vpfe_ipipe.subdev.entity,
			1, &vpfe_dev->vpfe_resizer.crop_resizer.subdev.entity,
			0, flags);
	if (ret < 0)
		goto out_resizer_register;

	ret = media_entity_create_link(&vpfe_dev->vpfe_ipipeif.subdev.entity, 1,
			&vpfe_dev->vpfe_resizer.crop_resizer.subdev.entity,
			0, flags);
	if (ret < 0)
		goto out_resizer_register;

	ret = v4l2_device_register_subdev_nodes(&vpfe_dev->v4l2_dev);
	if (ret < 0)
		goto out_resizer_register;

	return 0;

out_resizer_register:
	vpfe_resizer_unregister_entities(&vpfe_dev->vpfe_resizer);
out_ipipe_register:
	vpfe_ipipe_unregister_entities(&vpfe_dev->vpfe_ipipe);
out_ipipeif_register:
	vpfe_ipipeif_unregister_entities(&vpfe_dev->vpfe_ipipeif);
out_isif_register:
	vpfe_isif_unregister_entities(&vpfe_dev->vpfe_isif);

	return ret;
}

/*
 * vpfe_unregister_entities() - unregister all v4l2 subdevs and media entities
 * @vpfe_dev - ptr to vpfe capture device
 *
 * unregister all v4l2 subdevs and media entities
 */
static void vpfe_unregister_entities(struct vpfe_device *vpfe_dev)
{
	vpfe_isif_unregister_entities(&vpfe_dev->vpfe_isif);
	vpfe_ipipeif_unregister_entities(&vpfe_dev->vpfe_ipipeif);
	vpfe_ipipe_unregister_entities(&vpfe_dev->vpfe_ipipe);
	vpfe_resizer_unregister_entities(&vpfe_dev->vpfe_resizer);
}

/*
 * vpfe_cleanup_modules() - cleanup all non-i2c v4l2 subdevs
 * @vpfe_dev - ptr to vpfe capture device
 * @pdev - pointer to platform device
 *
 * cleanup all v4l2 subdevs
 */
static void vpfe_cleanup_modules(struct vpfe_device *vpfe_dev,
				 struct platform_device *pdev)
{
	vpfe_isif_cleanup(&vpfe_dev->vpfe_isif, pdev);
	vpfe_ipipeif_cleanup(&vpfe_dev->vpfe_ipipeif, pdev);
	vpfe_ipipe_cleanup(&vpfe_dev->vpfe_ipipe, pdev);
	vpfe_resizer_cleanup(&vpfe_dev->vpfe_resizer, pdev);
}

/*
 * vpfe_initialize_modules() - initialize all non-i2c v4l2 subdevs
 * @vpfe_dev - ptr to vpfe capture device
 * @pdev - pointer to platform device
 *
 * intialize all v4l2 subdevs and media entities
 */
static int vpfe_initialize_modules(struct vpfe_device *vpfe_dev,
				   struct platform_device *pdev)
{
	int ret;

	ret = vpfe_isif_init(&vpfe_dev->vpfe_isif, pdev);
	if (ret)
		return ret;

	ret = vpfe_ipipeif_init(&vpfe_dev->vpfe_ipipeif, pdev);
	if (ret)
		goto out_isif_init;

	ret = vpfe_ipipe_init(&vpfe_dev->vpfe_ipipe, pdev);
	if (ret)
		goto out_ipipeif_init;

	ret = vpfe_resizer_init(&vpfe_dev->vpfe_resizer, pdev);
	if (ret)
		goto out_ipipe_init;

	return 0;

out_ipipe_init:
	vpfe_ipipe_cleanup(&vpfe_dev->vpfe_ipipe, pdev);
out_ipipeif_init:
	vpfe_ipipeif_cleanup(&vpfe_dev->vpfe_ipipeif, pdev);
out_isif_init:
	vpfe_isif_cleanup(&vpfe_dev->vpfe_isif, pdev);

	return ret;
}

/*
 * vpfe_probe() : vpfe probe function
 * @pdev: platform device pointer
 *
 * This function creates device entries by register itself to the V4L2 driver
 * and initializes fields of each device objects
 */
static int vpfe_probe(struct platform_device *pdev)
{
	struct vpfe_device *vpfe_dev;
	struct resource *res1;
	int ret = -ENOMEM;

	vpfe_dev = kzalloc(sizeof(*vpfe_dev), GFP_KERNEL);
	if (!vpfe_dev)
		return ret;

	if (pdev->dev.platform_data == NULL) {
		v4l2_err(pdev->dev.driver, "Unable to get vpfe config\n");
		ret = -ENOENT;
		goto probe_free_dev_mem;
	}

	vpfe_dev->cfg = pdev->dev.platform_data;
	if (vpfe_dev->cfg->card_name == NULL ||
			vpfe_dev->cfg->sub_devs == NULL) {
		v4l2_err(pdev->dev.driver, "null ptr in vpfe_cfg\n");
		ret = -ENOENT;
		goto probe_free_dev_mem;
	}

	/* Get VINT0 irq resource */
	res1 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res1) {
		v4l2_err(pdev->dev.driver,
			 "Unable to get interrupt for VINT0\n");
		ret = -ENOENT;
		goto probe_free_dev_mem;
	}
	vpfe_dev->ccdc_irq0 = res1->start;

	/* Get VINT1 irq resource */
	res1 = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
	if (!res1) {
		v4l2_err(pdev->dev.driver,
			 "Unable to get interrupt for VINT1\n");
		ret = -ENOENT;
		goto probe_free_dev_mem;
	}
	vpfe_dev->ccdc_irq1 = res1->start;

	/* Get DMA irq resource */
	res1 = platform_get_resource(pdev, IORESOURCE_IRQ, 2);
	if (!res1) {
		v4l2_err(pdev->dev.driver,
			 "Unable to get interrupt for DMA\n");
		ret = -ENOENT;
		goto probe_free_dev_mem;
	}
	vpfe_dev->imp_dma_irq = res1->start;

	vpfe_dev->pdev = &pdev->dev;

	/* enable vpss clocks */
	ret = vpfe_enable_clock(vpfe_dev);
	if (ret)
		goto probe_free_dev_mem;

	ret = vpfe_initialize_modules(vpfe_dev, pdev);
	if (ret)
		goto probe_disable_clock;

	vpfe_dev->media_dev.dev = vpfe_dev->pdev;
	strcpy((char *)&vpfe_dev->media_dev.model, "davinci-media");

	ret = media_device_register(&vpfe_dev->media_dev);
	if (ret) {
		v4l2_err(pdev->dev.driver,
			"Unable to register media device.\n");
		goto probe_out_entities_cleanup;
	}

	vpfe_dev->v4l2_dev.mdev = &vpfe_dev->media_dev;
	ret = v4l2_device_register(&pdev->dev, &vpfe_dev->v4l2_dev);
	if (ret) {
		v4l2_err(pdev->dev.driver, "Unable to register v4l2 device.\n");
		goto probe_out_media_unregister;
	}

	v4l2_info(&vpfe_dev->v4l2_dev, "v4l2 device registered\n");
	/* set the driver data in platform device */
	platform_set_drvdata(pdev, vpfe_dev);
	/* register subdevs/entities */
	ret = vpfe_register_entities(vpfe_dev);
	if (ret)
		goto probe_out_v4l2_unregister;

	ret = vpfe_attach_irq(vpfe_dev);
	if (ret)
		goto probe_out_entities_unregister;

	return 0;

probe_out_entities_unregister:
	vpfe_unregister_entities(vpfe_dev);
	kzfree(vpfe_dev->sd);
probe_out_v4l2_unregister:
	v4l2_device_unregister(&vpfe_dev->v4l2_dev);
probe_out_media_unregister:
	media_device_unregister(&vpfe_dev->media_dev);
probe_out_entities_cleanup:
	vpfe_cleanup_modules(vpfe_dev, pdev);
probe_disable_clock:
	vpfe_disable_clock(vpfe_dev);
probe_free_dev_mem:
	kzfree(vpfe_dev);

	return ret;
}

/*
 * vpfe_remove : This function un-registers device from V4L2 driver
 */
static int vpfe_remove(struct platform_device *pdev)
{
	struct vpfe_device *vpfe_dev = platform_get_drvdata(pdev);

	v4l2_info(pdev->dev.driver, "vpfe_remove\n");

	kzfree(vpfe_dev->sd);
	vpfe_detach_irq(vpfe_dev);
	vpfe_unregister_entities(vpfe_dev);
	vpfe_cleanup_modules(vpfe_dev, pdev);
	v4l2_device_unregister(&vpfe_dev->v4l2_dev);
	media_device_unregister(&vpfe_dev->media_dev);
	vpfe_disable_clock(vpfe_dev);
	kzfree(vpfe_dev);

	return 0;
}

static struct platform_driver vpfe_driver = {
	.driver = {
		.name = CAPTURE_DRV_NAME,
	},
	.probe = vpfe_probe,
	.remove = vpfe_remove,
};

module_platform_driver(vpfe_driver);