cx25840-core.c

linux内核源码

/* cx25840 - Conexant CX25840 audio/video decoder driver
 *
 * Copyright (C) 2004 Ulf Eklund
 *
 * Based on the saa7115 driver and on the first verison of Chris Kennedy's
 * cx25840 driver.
 *
 * Changes by Tyler Trafford <[e-mail]>
 *    - cleanup/rewrite for V4L2 API (2005)
 *
 * VBI support by Hans Verkuil <[e-mail]>.
 *
 * NTSC sliced VBI support by Christopher Neufeld <[e-mail]>
 * with additional fixes by Hans Verkuil <[e-mail]>.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/cx25840.h>

#include "cx25840-core.h"

MODULE_DESCRIPTION("Conexant CX25840 audio/video decoder driver");
MODULE_AUTHOR("Ulf Eklund, Chris Kennedy, Hans Verkuil, Tyler Trafford");
MODULE_LICENSE("GPL");

static unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };


int cx25840_debug;

module_param_named(debug,cx25840_debug, int, 0644);

MODULE_PARM_DESC(debug, "Debugging messages [0=Off (default) 1=On]");

I2C_CLIENT_INSMOD;

/* ----------------------------------------------------------------------- */

int cx25840_write(struct i2c_client *client, u16 addr, u8 value)
{
	u8 buffer[3];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;
	buffer[2] = value;
	return i2c_master_send(client, buffer, 3);
}

int cx25840_write4(struct i2c_client *client, u16 addr, u32 value)
{
	u8 buffer[6];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;
	buffer[2] = value >> 24;
	buffer[3] = (value >> 16) & 0xff;
	buffer[4] = (value >> 8) & 0xff;
	buffer[5] = value & 0xff;
	return i2c_master_send(client, buffer, 6);
}

u8 cx25840_read(struct i2c_client * client, u16 addr)
{
	u8 buffer[2];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;

	if (i2c_master_send(client, buffer, 2) < 2)
		return 0;

	if (i2c_master_recv(client, buffer, 1) < 1)
		return 0;

	return buffer[0];
}

u32 cx25840_read4(struct i2c_client * client, u16 addr)
{
	u8 buffer[4];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;

	if (i2c_master_send(client, buffer, 2) < 2)
		return 0;

	if (i2c_master_recv(client, buffer, 4) < 4)
		return 0;

	return (buffer[3] << 24) | (buffer[2] << 16) |
	    (buffer[1] << 8) | buffer[0];
}

int cx25840_and_or(struct i2c_client *client, u16 addr, unsigned and_mask,
		   u8 or_value)
{
	return cx25840_write(client, addr,
			     (cx25840_read(client, addr) & and_mask) |
			     or_value);
}

/* ----------------------------------------------------------------------- */

static int set_input(struct i2c_client *client, enum cx25840_video_input vid_input,
						enum cx25840_audio_input aud_input);
static void log_audio_status(struct i2c_client *client);
static void log_video_status(struct i2c_client *client);

/* ----------------------------------------------------------------------- */

static void init_dll1(struct i2c_client *client)
{
	/* This is the Hauppauge sequence used to
	 * initialize the Delay Lock Loop 1 (ADC DLL). */
	cx25840_write(client, 0x159, 0x23);
	cx25840_write(client, 0x15a, 0x87);
	cx25840_write(client, 0x15b, 0x06);
	udelay(10);
	cx25840_write(client, 0x159, 0xe1);
	udelay(10);
	cx25840_write(client, 0x15a, 0x86);
	cx25840_write(client, 0x159, 0xe0);
	cx25840_write(client, 0x159, 0xe1);
	cx25840_write(client, 0x15b, 0x10);
}

static void init_dll2(struct i2c_client *client)
{
	/* This is the Hauppauge sequence used to
	 * initialize the Delay Lock Loop 2 (ADC DLL). */
	cx25840_write(client, 0x15d, 0xe3);
	cx25840_write(client, 0x15e, 0x86);
	cx25840_write(client, 0x15f, 0x06);
	udelay(10);
	cx25840_write(client, 0x15d, 0xe1);
	cx25840_write(client, 0x15d, 0xe0);
	cx25840_write(client, 0x15d, 0xe1);
}

static void cx25836_initialize(struct i2c_client *client)
{
	/* reset configuration is described on page 3-77 of the CX25836 datasheet */
	/* 2. */
	cx25840_and_or(client, 0x000, ~0x01, 0x01);
	cx25840_and_or(client, 0x000, ~0x01, 0x00);
	/* 3a. */
	cx25840_and_or(client, 0x15a, ~0x70, 0x00);
	/* 3b. */
	cx25840_and_or(client, 0x15b, ~0x1e, 0x06);
	/* 3c. */
	cx25840_and_or(client, 0x159, ~0x02, 0x02);
	/* 3d. */
	udelay(10);
	/* 3e. */
	cx25840_and_or(client, 0x159, ~0x02, 0x00);
	/* 3f. */
	cx25840_and_or(client, 0x159, ~0xc0, 0xc0);
	/* 3g. */
	cx25840_and_or(client, 0x159, ~0x01, 0x00);
	cx25840_and_or(client, 0x159, ~0x01, 0x01);
	/* 3h. */
	cx25840_and_or(client, 0x15b, ~0x1e, 0x10);
}

static void cx25840_work_handler(struct work_struct *work)
{
	struct cx25840_state *state = container_of(work, struct cx25840_state, fw_work);
	cx25840_loadfw(state->c);
	wake_up(&state->fw_wait);
}

static void cx25840_initialize(struct i2c_client *client)
{
	DEFINE_WAIT(wait);
	struct cx25840_state *state = i2c_get_clientdata(client);
	struct workqueue_struct *q;

	/* datasheet startup in numbered steps, refer to page 3-77 */
	/* 2. */
	cx25840_and_or(client, 0x803, ~0x10, 0x00);
	/* The default of this register should be 4, but I get 0 instead.
	 * Set this register to 4 manually. */
	cx25840_write(client, 0x000, 0x04);
	/* 3. */
	init_dll1(client);
	init_dll2(client);
	cx25840_write(client, 0x136, 0x0a);
	/* 4. */
	cx25840_write(client, 0x13c, 0x01);
	cx25840_write(client, 0x13c, 0x00);
	/* 5. */
	/* Do the firmware load in a work handler to prevent.
	   Otherwise the kernel is blocked waiting for the
	   bit-banging i2c interface to finish uploading the
	   firmware. */
	INIT_WORK(&state->fw_work, cx25840_work_handler);
	init_waitqueue_head(&state->fw_wait);
	q = create_singlethread_workqueue("cx25840_fw");
	prepare_to_wait(&state->fw_wait, &wait, TASK_UNINTERRUPTIBLE);
	queue_work(q, &state->fw_work);
	schedule();
	finish_wait(&state->fw_wait, &wait);
	destroy_workqueue(q);

	/* 6. */
	cx25840_write(client, 0x115, 0x8c);
	cx25840_write(client, 0x116, 0x07);
	cx25840_write(client, 0x118, 0x02);
	/* 7. */
	cx25840_write(client, 0x4a5, 0x80);
	cx25840_write(client, 0x4a5, 0x00);
	cx25840_write(client, 0x402, 0x00);
	/* 8. */
	cx25840_and_or(client, 0x401, ~0x18, 0);
	cx25840_and_or(client, 0x4a2, ~0x10, 0x10);
	/* steps 8c and 8d are done in change_input() */
	/* 10. */
	cx25840_write(client, 0x8d3, 0x1f);
	cx25840_write(client, 0x8e3, 0x03);

	cx25840_vbi_setup(client);

	/* trial and error says these are needed to get audio */
	cx25840_write(client, 0x914, 0xa0);
	cx25840_write(client, 0x918, 0xa0);
	cx25840_write(client, 0x919, 0x01);

	/* stereo prefered */
	cx25840_write(client, 0x809, 0x04);
	/* AC97 shift */
	cx25840_write(client, 0x8cf, 0x0f);

	/* (re)set input */
	set_input(client, state->vid_input, state->aud_input);

	/* start microcontroller */
	cx25840_and_or(client, 0x803, ~0x10, 0x10);
}

/* ----------------------------------------------------------------------- */

static void input_change(struct i2c_client *client)
{
	struct cx25840_state *state = i2c_get_clientdata(client);
	v4l2_std_id std = cx25840_get_v4lstd(client);

	/* Follow step 8c and 8d of section 3.16 in the cx25840 datasheet */
	if (std & V4L2_STD_SECAM) {
		cx25840_write(client, 0x402, 0);
	}
	else {
		cx25840_write(client, 0x402, 0x04);
		cx25840_write(client, 0x49f, (std & V4L2_STD_NTSC) ? 0x14 : 0x11);
	}
	cx25840_and_or(client, 0x401, ~0x60, 0);
	cx25840_and_or(client, 0x401, ~0x60, 0x60);
	cx25840_and_or(client, 0x810, ~0x01, 1);

	if (state->radio) {
		cx25840_write(client, 0x808, 0xf9);
		cx25840_write(client, 0x80b, 0x00);
	}
	else if (std & V4L2_STD_525_60) {
		/* Certain Hauppauge PVR150 models have a hardware bug
		   that causes audio to drop out. For these models the
		   audio standard must be set explicitly.
		   To be precise: it affects cards with tuner models
		   85, 99 and 112 (model numbers from tveeprom). */
		int hw_fix = state->pvr150_workaround;

		if (std == V4L2_STD_NTSC_M_JP) {
			/* Japan uses EIAJ audio standard */
			cx25840_write(client, 0x808, hw_fix ? 0x2f : 0xf7);
		} else if (std == V4L2_STD_NTSC_M_KR) {
			/* South Korea uses A2 audio standard */
			cx25840_write(client, 0x808, hw_fix ? 0x3f : 0xf8);
		} else {
			/* Others use the BTSC audio standard */
			cx25840_write(client, 0x808, hw_fix ? 0x1f : 0xf6);
		}
		cx25840_write(client, 0x80b, 0x00);
	} else if (std & V4L2_STD_PAL) {
		/* Follow tuner change procedure for PAL */
		cx25840_write(client, 0x808, 0xff);
		cx25840_write(client, 0x80b, 0x10);
	} else if (std & V4L2_STD_SECAM) {
		/* Select autodetect for SECAM */
		cx25840_write(client, 0x808, 0xff);
		cx25840_write(client, 0x80b, 0x10);
	}

	cx25840_and_or(client, 0x810, ~0x01, 0);
}

static int set_input(struct i2c_client *client, enum cx25840_video_input vid_input,
						enum cx25840_audio_input aud_input)
{
	struct cx25840_state *state = i2c_get_clientdata(client);
	u8 is_composite = (vid_input >= CX25840_COMPOSITE1 &&
			   vid_input <= CX25840_COMPOSITE8);
	u8 reg;

	v4l_dbg(1, cx25840_debug, client, "decoder set video input %d, audio input %d\n",
			vid_input, aud_input);

	if (is_composite) {
		reg = 0xf0 + (vid_input - CX25840_COMPOSITE1);
	} else {
		int luma = vid_input & 0xf0;
		int chroma = vid_input & 0xf00;

		if ((vid_input & ~0xff0) ||
		    luma < CX25840_SVIDEO_LUMA1 || luma > CX25840_SVIDEO_LUMA4 ||
		    chroma < CX25840_SVIDEO_CHROMA4 || chroma > CX25840_SVIDEO_CHROMA8) {
			v4l_err(client, "0x%04x is not a valid video input!\n", vid_input);
			return -EINVAL;
		}
		reg = 0xf0 + ((luma - CX25840_SVIDEO_LUMA1) >> 4);
		if (chroma >= CX25840_SVIDEO_CHROMA7) {
			reg &= 0x3f;
			reg |= (chroma - CX25840_SVIDEO_CHROMA7) >> 2;
		} else {
			reg &= 0xcf;
			reg |= (chroma - CX25840_SVIDEO_CHROMA4) >> 4;
		}
	}

	switch (aud_input) {
	case CX25840_AUDIO_SERIAL:
		/* do nothing, use serial audio input */
		break;
	case CX25840_AUDIO4: reg &= ~0x30; break;
	case CX25840_AUDIO5: reg &= ~0x30; reg |= 0x10; break;
	case CX25840_AUDIO6: reg &= ~0x30; reg |= 0x20; break;
	case CX25840_AUDIO7: reg &= ~0xc0; break;
	case CX25840_AUDIO8: reg &= ~0xc0; reg |= 0x40; break;

	default:
		v4l_err(client, "0x%04x is not a valid audio input!\n", aud_input);
		return -EINVAL;
	}

	cx25840_write(client, 0x103, reg);
	/* Set INPUT_MODE to Composite (0) or S-Video (1) */
	cx25840_and_or(client, 0x401, ~0x6, is_composite ? 0 : 0x02);
	/* Set CH_SEL_ADC2 to 1 if input comes from CH3 */
	cx25840_and_or(client, 0x102, ~0x2, (reg & 0x80) == 0 ? 2 : 0);
	/* Set DUAL_MODE_ADC2 to 1 if input comes from both CH2 and CH3 */
	if ((reg & 0xc0) != 0xc0 && (reg & 0x30) != 0x30)
		cx25840_and_or(client, 0x102, ~0x4, 4);
	else
		cx25840_and_or(client, 0x102, ~0x4, 0);

	state->vid_input = vid_input;
	state->aud_input = aud_input;
	if (!state->is_cx25836) {
		cx25840_audio_set_path(client);
		input_change(client);
	}
	return 0;
}

/* ----------------------------------------------------------------------- */

static int set_v4lstd(struct i2c_client *client, v4l2_std_id std)
{
	u8 fmt=0; 	/* zero is autodetect */

	/* First tests should be against specific std */
	if (std == V4L2_STD_NTSC_M_JP) {
		fmt=0x2;
	} else if (std == V4L2_STD_NTSC_443) {
		fmt=0x3;
	} else if (std == V4L2_STD_PAL_M) {
		fmt=0x5;
	} else if (std == V4L2_STD_PAL_N) {
		fmt=0x6;
	} else if (std == V4L2_STD_PAL_Nc) {
		fmt=0x7;
	} else if (std == V4L2_STD_PAL_60) {
		fmt=0x8;