path: root/drivers/staging/dt3155v4l/dt3155v4l.c

/***************************************************************************
 *   Copyright (C) 2006-2010 by Marin Mitov                                *
 *   mitov@issp.bas.bg                                                     *
 *                                                                         *
 *   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; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   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.             *
 ***************************************************************************/

#include <linux/version.h>
#include <linux/stringify.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf-dma-contig.h>

#include "dt3155v4l.h"

#define DT3155_VENDOR_ID 0x8086
#define DT3155_DEVICE_ID 0x1223

/* DT3155_CHUNK_SIZE is 4M (2^22) 8 full size buffers */
#define DT3155_CHUNK_SIZE (1U << 22)

#define DT3155_COH_FLAGS (GFP_KERNEL | GFP_DMA32 | __GFP_COLD | __GFP_NOWARN)

#define DT3155_BUF_SIZE (768 * 576)

/*  global initializers (for all boards)  */
#ifdef CONFIG_DT3155_CCIR
static const u8 csr2_init = VT_50HZ;
#define DT3155_CURRENT_NORM V4L2_STD_625_50
static const unsigned int img_width = 768;
static const unsigned int img_height = 576;
static const unsigned int frames_per_sec = 25;
static const struct v4l2_fmtdesc frame_std[] = {
	{
	.index = 0,
	.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
	.flags = 0,
	.description = "CCIR/50Hz 8 bits gray",
	.pixelformat = V4L2_PIX_FMT_GREY,
	},
};
#else
static const u8 csr2_init = VT_60HZ;
#define DT3155_CURRENT_NORM V4L2_STD_525_60
static const unsigned int img_width = 640;
static const unsigned int img_height = 480;
static const unsigned int frames_per_sec = 30;
static const struct v4l2_fmtdesc frame_std[] = {
	{
	.index = 0,
	.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
	.flags = 0,
	.description = "RS-170/60Hz 8 bits gray",
	.pixelformat = V4L2_PIX_FMT_GREY,
	},
};
#endif

#define NUM_OF_FORMATS ARRAY_SIZE(frame_std)

static u8 config_init = ACQ_MODE_EVEN;

/**
 * read_i2c_reg - reads an internal i2c register
 *
 * @addr:	dt3155 mmio base address
 * @index:	index (internal address) of register to read
 * @data:	pointer to byte the read data will be placed in
 *
 * returns:	zero on success or error code
 *
 * This function starts reading the specified (by index) register
 * and busy waits for the process to finish. The result is placed
 * in a byte pointed by data.
 */
static int
read_i2c_reg(void __iomem *addr, u8 index, u8 *data)
{
	u32 tmp = index;

	iowrite32((tmp<<17) | IIC_READ, addr + IIC_CSR2);
	mmiowb();
	udelay(45); /* wait at least 43 usec for NEW_CYCLE to clear */
	if (ioread32(addr + IIC_CSR2) & NEW_CYCLE) {
		/* error: NEW_CYCLE not cleared */
		printk(KERN_ERR "dt3155: NEW_CYCLE not cleared\n");
		return -EIO;
	}
	tmp = ioread32(addr + IIC_CSR1);
	if (tmp & DIRECT_ABORT) {
		/* error: DIRECT_ABORT set */
		printk(KERN_ERR "dt3155: DIRECT_ABORT set\n");
		/* reset DIRECT_ABORT bit */
		iowrite32(DIRECT_ABORT, addr + IIC_CSR1);
		return -EIO;
	}
	*data = tmp>>24;
	return 0;
}

/**
 * write_i2c_reg - writes to an internal i2c register
 *
 * @addr:	dt3155 mmio base address
 * @index:	index (internal address) of register to read
 * @data:	data to be written
 *
 * returns:	zero on success or error code
 *
 * This function starts writting the specified (by index) register
 * and busy waits for the process to finish.
 */
static int
write_i2c_reg(void __iomem *