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[PATCH] v4l: (946) adds support for cx25840 video decoder
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Adds support for cx25840 video decoder.

Driver authors: Hans Verkuil, Chris Kennedy, Tyler Trafford, Ulf Eklund.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Chris Kennedy <c@groovy.org>
Signed-off-by: Tyler Trafford <tatrafford@comcast.net>
Thanks-to: Ulf Eklund <ivtv@eklund.to>.
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Hans Verkuil authored and Linus Torvalds committed Nov 14, 2005
1 parent b2f0648 commit bd98516
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369 changes: 369 additions & 0 deletions drivers/media/video/cx25840/cx25840-audio.c
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/* cx25840 audio functions
*
* 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/videodev2.h>
#include <linux/i2c.h>
#include <media/audiochip.h>
#include <media/i2c-compat.h>
#include <media/v4l2-common.h>

#include "cx25840.h"

inline static int set_audclk_freq(struct i2c_client *client,
enum v4l2_audio_clock_freq freq)
{
struct cx25840_state *state = i2c_get_clientdata(client);

/* assert soft reset */
cx25840_and_or(client, 0x810, ~0x1, 0x01);

/* common for all inputs and rates */
/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
cx25840_write(client, 0x127, 0x50);

switch (state->audio_input) {
case AUDIO_TUNER:
switch (freq) {
case V4L2_AUDCLK_32_KHZ:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040610);

/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xee39bb01);

/* src3/4/6_ctl = 0x0801f77f */
cx25840_write4(client, 0x900, 0x7ff70108);
cx25840_write4(client, 0x904, 0x7ff70108);
cx25840_write4(client, 0x90c, 0x7ff70108);
break;

case V4L2_AUDCLK_441_KHZ:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040910);

/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xd66bec00);

/* src3/4/6_ctl = 0x08016d59 */
cx25840_write4(client, 0x900, 0x596d0108);
cx25840_write4(client, 0x904, 0x596d0108);
cx25840_write4(client, 0x90c, 0x596d0108);
break;

case V4L2_AUDCLK_48_KHZ:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040a10);

/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xe5d69800);

/* src3/4/6_ctl = 0x08014faa */
cx25840_write4(client, 0x900, 0xaa4f0108);
cx25840_write4(client, 0x904, 0xaa4f0108);
cx25840_write4(client, 0x90c, 0xaa4f0108);
break;
}
break;

case AUDIO_EXTERN_1:
case AUDIO_EXTERN_2:
case AUDIO_INTERN:
case AUDIO_RADIO:
switch (freq) {
case V4L2_AUDCLK_32_KHZ:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f04081e);

/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0x69082a01);

/* src1_ctl = 0x08010000 */
cx25840_write4(client, 0x8f8, 0x00000108);

/* src3/4/6_ctl = 0x08020000 */
cx25840_write4(client, 0x900, 0x00000208);
cx25840_write4(client, 0x904, 0x00000208);
cx25840_write4(client, 0x90c, 0x00000208);

/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
cx25840_write(client, 0x127, 0x54);
break;

case V4L2_AUDCLK_441_KHZ:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040918);

/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xd66bec00);

/* src1_ctl = 0x08010000 */
cx25840_write4(client, 0x8f8, 0xcd600108);

/* src3/4/6_ctl = 0x08020000 */
cx25840_write4(client, 0x900, 0x85730108);
cx25840_write4(client, 0x904, 0x85730108);
cx25840_write4(client, 0x90c, 0x85730108);
break;

case V4L2_AUDCLK_48_KHZ:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040a18);

/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xe5d69800);

/* src1_ctl = 0x08010000 */
cx25840_write4(client, 0x8f8, 0x00800108);

/* src3/4/6_ctl = 0x08020000 */
cx25840_write4(client, 0x900, 0x55550108);
cx25840_write4(client, 0x904, 0x55550108);
cx25840_write4(client, 0x90c, 0x55550108);
break;
}
break;
}

/* deassert soft reset */
cx25840_and_or(client, 0x810, ~0x1, 0x00);

state->audclk_freq = freq;

return 0;
}

static int set_input(struct i2c_client *client, int audio_input)
{
struct cx25840_state *state = i2c_get_clientdata(client);

cx25840_dbg("set audio input (%d)\n", audio_input);

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

/* Mute everything to prevent the PFFT! */
cx25840_write(client, 0x8d3, 0x1f);

switch (audio_input) {
case AUDIO_TUNER:
/* Set Path1 to Analog Demod Main Channel */
cx25840_write4(client, 0x8d0, 0x7038061f);

/* When the microcontroller detects the
* audio format, it will unmute the lines */
cx25840_and_or(client, 0x803, ~0x10, 0x10);
break;

case AUDIO_EXTERN_1:
case AUDIO_EXTERN_2:
case AUDIO_INTERN:
case AUDIO_RADIO:
/* Set Path1 to Serial Audio Input */
cx25840_write4(client, 0x8d0, 0x12100101);

/* The microcontroller should not be started for the
* non-tuner inputs: autodetection is specific for
* TV audio. */
break;

default:
cx25840_dbg("Invalid audio input selection %d\n", audio_input);
return -EINVAL;
}

state->audio_input = audio_input;

return set_audclk_freq(client, state->audclk_freq);
}

inline static int get_volume(struct i2c_client *client)
{
/* Volume runs +18dB to -96dB in 1/2dB steps
* change to fit the msp3400 -114dB to +12dB range */

/* check PATH1_VOLUME */
int vol = 228 - cx25840_read(client, 0x8d4);
vol = (vol / 2) + 23;
return vol << 9;
}

inline static void set_volume(struct i2c_client *client, int volume)
{
/* First convert the volume to msp3400 values (0-127) */
int vol = volume >> 9;
/* now scale it up to cx25840 values
* -114dB to -96dB maps to 0
* this should be 19, but in my testing that was 4dB too loud */
if (vol <= 23) {
vol = 0;
} else {
vol -= 23;
}

/* PATH1_VOLUME */
cx25840_write(client, 0x8d4, 228 - (vol * 2));
}

inline static int get_bass(struct i2c_client *client)
{
/* bass is 49 steps +12dB to -12dB */

/* check PATH1_EQ_BASS_VOL */
int bass = cx25840_read(client, 0x8d9) & 0x3f;
bass = (((48 - bass) * 0xffff) + 47) / 48;
return bass;
}

inline static void set_bass(struct i2c_client *client, int bass)
{
/* PATH1_EQ_BASS_VOL */
cx25840_and_or(client, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
}

inline static int get_treble(struct i2c_client *client)
{
/* treble is 49 steps +12dB to -12dB */

/* check PATH1_EQ_TREBLE_VOL */
int treble = cx25840_read(client, 0x8db) & 0x3f;
treble = (((48 - treble) * 0xffff) + 47) / 48;
return treble;
}

inline static void set_treble(struct i2c_client *client, int treble)
{
/* PATH1_EQ_TREBLE_VOL */
cx25840_and_or(client, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
}

inline static int get_balance(struct i2c_client *client)
{
/* balance is 7 bit, 0 to -96dB */

/* check PATH1_BAL_LEVEL */
int balance = cx25840_read(client, 0x8d5) & 0x7f;
/* check PATH1_BAL_LEFT */
if ((cx25840_read(client, 0x8d5) & 0x80) == 0)
balance = 0x80 - balance;
else
balance = 0x80 + balance;
return balance << 8;
}

inline static void set_balance(struct i2c_client *client, int balance)
{
int bal = balance >> 8;
if (bal > 0x80) {
/* PATH1_BAL_LEFT */
cx25840_and_or(client, 0x8d5, 0x7f, 0x80);
/* PATH1_BAL_LEVEL */
cx25840_and_or(client, 0x8d5, ~0x7f, bal & 0x7f);
} else {
/* PATH1_BAL_LEFT */
cx25840_and_or(client, 0x8d5, 0x7f, 0x00);
/* PATH1_BAL_LEVEL */
cx25840_and_or(client, 0x8d5, ~0x7f, 0x80 - bal);
}
}

inline static int get_mute(struct i2c_client *client)
{
/* check SRC1_MUTE_EN */
return cx25840_read(client, 0x8d3) & 0x2 ? 1 : 0;
}

inline static void set_mute(struct i2c_client *client, int mute)
{
struct cx25840_state *state = i2c_get_clientdata(client);

if (state->audio_input == AUDIO_TUNER) {
/* Must turn off microcontroller in order to mute sound.
* Not sure if this is the best method, but it does work.
* If the microcontroller is running, then it will undo any
* changes to the mute register. */
if (mute) {
/* disable microcontroller */
cx25840_and_or(client, 0x803, ~0x10, 0x00);
cx25840_write(client, 0x8d3, 0x1f);
} else {
/* enable microcontroller */
cx25840_and_or(client, 0x803, ~0x10, 0x10);
}
} else {
/* SRC1_MUTE_EN */
cx25840_and_or(client, 0x8d3, ~0x2, mute ? 0x02 : 0x00);
}
}

int cx25840_audio(struct i2c_client *client, unsigned int cmd, void *arg)
{
struct v4l2_control *ctrl = arg;

switch (cmd) {
case AUDC_SET_INPUT:
return set_input(client, *(int *)arg);
case VIDIOC_INT_AUDIO_CLOCK_FREQ:
return set_audclk_freq(client, *(enum v4l2_audio_clock_freq *)arg);
case VIDIOC_G_CTRL:
switch (ctrl->id) {
case V4L2_CID_AUDIO_VOLUME:
ctrl->value = get_volume(client);
break;
case V4L2_CID_AUDIO_BASS:
ctrl->value = get_bass(client);
break;
case V4L2_CID_AUDIO_TREBLE:
ctrl->value = get_treble(client);
break;
case V4L2_CID_AUDIO_BALANCE:
ctrl->value = get_balance(client);
break;
case V4L2_CID_AUDIO_MUTE:
ctrl->value = get_mute(client);
break;
default:
return -EINVAL;
}
break;
case VIDIOC_S_CTRL:
switch (ctrl->id) {
case V4L2_CID_AUDIO_VOLUME:
set_volume(client, ctrl->value);
break;
case V4L2_CID_AUDIO_BASS:
set_bass(client, ctrl->value);
break;
case V4L2_CID_AUDIO_TREBLE:
set_treble(client, ctrl->value);
break;
case V4L2_CID_AUDIO_BALANCE:
set_balance(client, ctrl->value);
break;
case V4L2_CID_AUDIO_MUTE:
set_mute(client, ctrl->value);
break;
default:
return -EINVAL;
}
break;
default:
return -EINVAL;
}

return 0;
}
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