path: root/drivers/media/i2c/ad9389b.c

/*
 * Analog Devices AD9389B/AD9889B video encoder driver
 *
 * Copyright 2012 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * References (c = chapter, p = page):
 * REF_01 - Analog Devices, Programming Guide, AD9889B/AD9389B,
 * HDMI Transitter, Rev. A, October 2010
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/videodev2.h>
#include <linux/workqueue.h>
#include <linux/v4l2-dv-timings.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/ad9389b.h>

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "debug level (0-2)");

MODULE_DESCRIPTION("Analog Devices AD9389B/AD9889B video encoder driver");
MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
MODULE_AUTHOR("Martin Bugge <marbugge@cisco.com>");
MODULE_LICENSE("GPL");

#define MASK_AD9389B_EDID_RDY_INT   0x04
#define MASK_AD9389B_MSEN_INT       0x40
#define MASK_AD9389B_HPD_INT        0x80

#define MASK_AD9389B_HPD_DETECT     0x40
#define MASK_AD9389B_MSEN_DETECT    0x20
#define MASK_AD9389B_EDID_RDY       0x10

#define EDID_MAX_RETRIES (8)
#define EDID_DELAY 250
#define EDID_MAX_SEGM 8

/*
**********************************************************************
*
*  Arrays with configuration parameters for the AD9389B
*
**********************************************************************
*/

struct i2c_reg_value {
	u8 reg;
	u8 value;
};

struct ad9389b_state_edid {
	/* total number of blocks */
	u32 blocks;
	/* Number of segments read */
	u32 segments;
	u8 data[EDID_MAX_SEGM * 256];
	/* Number of EDID read retries left */
	unsigned read_retries;
};

struct ad9389b_state {
	struct ad9389b_platform_data pdata;
	struct v4l2_subdev sd;
	struct media_pad pad;
	struct v4l2_ctrl_handler hdl;
	int chip_revision;
	/* Is the ad9389b powered on? */
	bool power_on;
	/* Did we receive hotplug and rx-sense signals? */
	bool have_monitor;
	/* timings from s_dv_timings */
	struct v4l2_dv_timings dv_timings;
	/* controls */
	struct v4l2_ctrl *hdmi_mode_ctrl;
	struct v4l2_ctrl *hotplug_ctrl;
	struct v4l2_ctrl *rx_sense_ctrl;
	struct v4l2_ctrl *have_edid0_ctrl;
	struct v4l2_ctrl *rgb_quantization_range_ctrl;
	struct i2c_client *edid_i2c_client;
	struct ad9389b_state_edid edid;
	/* Running counter of the number of detected EDIDs (for debugging) */
	unsigned edid_detect_counter;
	struct workqueue_struct *work_queue;
	struct delayed_work edid_handler; /* work entry */
};

static void ad9389b_check_monitor_present_status