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linux-next/drivers/media/video/cx25840/cx25840-audio.c
Hans Verkuil 87410dab12 V4L/DVB (5997): cx25840: fix audio mute handling and reporting 
Audio muting for the tuner input was implemented by stopping the 
audio microcontroller and restarting it on unmute. However, it 
appears that this method can actually crash the audio firmware. 
It's rare and seems to happen with NTSC only.

It has been reimplemented by setting to volume to 0. In addition, the
reporting of the mute state has been improved as well: it used to be
impossible to detect whether the audio was muted by the user or if it
was muted due to the microcontroller trying to detect the audio
standard. This is now clearly stated.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2007-10-09 22:04:55 -03:00

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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/v4l2-common.h>
#include <media/cx25840.h>
#include "cx25840-core.h"
static int set_audclk_freq(struct i2c_client *client, u32 freq)
{
struct cx25840_state *state = i2c_get_clientdata(client);
if (freq != 32000 && freq != 44100 && freq != 48000)
return -EINVAL;
/* common for all inputs and rates */
/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
cx25840_write(client, 0x127, 0x50);
if (state->aud_input != CX25840_AUDIO_SERIAL) {
switch (freq) {
case 32000:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040610);
/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xee39bb01);
if (state->is_cx25836)
break;
/* src3/4/6_ctl = 0x0801f77f */
cx25840_write4(client, 0x900, 0x7ff70108);
cx25840_write4(client, 0x904, 0x7ff70108);
cx25840_write4(client, 0x90c, 0x7ff70108);
break;
case 44100:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040910);
/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xd66bec00);
if (state->is_cx25836)
break;
/* src3/4/6_ctl = 0x08016d59 */
cx25840_write4(client, 0x900, 0x596d0108);
cx25840_write4(client, 0x904, 0x596d0108);
cx25840_write4(client, 0x90c, 0x596d0108);
break;
case 48000:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040a10);
/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xe5d69800);
if (state->is_cx25836)
break;
/* src3/4/6_ctl = 0x08014faa */
cx25840_write4(client, 0x900, 0xaa4f0108);
cx25840_write4(client, 0x904, 0xaa4f0108);
cx25840_write4(client, 0x90c, 0xaa4f0108);
break;
}
} else {
switch (freq) {
case 32000:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f04081e);
/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0x69082a01);
if (state->is_cx25836)
break;
/* 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 44100:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040918);
/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xd66bec00);
if (state->is_cx25836)
break;
/* 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 48000:
/* VID_PLL and AUX_PLL */
cx25840_write4(client, 0x108, 0x0f040a18);
/* AUX_PLL_FRAC */
cx25840_write4(client, 0x110, 0xe5d69800);
if (state->is_cx25836)
break;
/* 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;
}
}
state->audclk_freq = freq;
return 0;
}
void cx25840_audio_set_path(struct i2c_client *client)
{
struct cx25840_state *state = i2c_get_clientdata(client);
/* stop microcontroller */
cx25840_and_or(client, 0x803, ~0x10, 0);
/* assert soft reset */
if (!state->is_cx25836)
cx25840_and_or(client, 0x810, ~0x1, 0x01);
/* Mute everything to prevent the PFFT! */
cx25840_write(client, 0x8d3, 0x1f);
if (state->aud_input == CX25840_AUDIO_SERIAL) {
/* 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. */
} else {
/* Set Path1 to Analog Demod Main Channel */
cx25840_write4(client, 0x8d0, 0x7038061f);
}
set_audclk_freq(client, state->audclk_freq);
/* deassert soft reset */
if (!state->is_cx25836)
cx25840_and_or(client, 0x810, ~0x1, 0x00);
if (state->aud_input != CX25840_AUDIO_SERIAL) {
/* When the microcontroller detects the
* audio format, it will unmute the lines */
cx25840_and_or(client, 0x803, ~0x10, 0x10);
}
}
static int get_volume(struct i2c_client *client)
{
struct cx25840_state *state = i2c_get_clientdata(client);
int vol;
if (state->unmute_volume >= 0)
return state->unmute_volume;
/* Volume runs +18dB to -96dB in 1/2dB steps
* change to fit the msp3400 -114dB to +12dB range */
/* check PATH1_VOLUME */
vol = 228 - cx25840_read(client, 0x8d4);
vol = (vol / 2) + 23;
return vol << 9;
}
static void set_volume(struct i2c_client *client, int volume)
{
struct cx25840_state *state = i2c_get_clientdata(client);
int vol;
if (state->unmute_volume >= 0) {
state->unmute_volume = volume;
return;
}
/* Convert the volume to msp3400 values (0-127) */
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));
}
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;
}
static void set_bass(struct i2c_client *client, int bass)
{
/* PATH1_EQ_BASS_VOL */
cx25840_and_or(client, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
}
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;
}
static void set_treble(struct i2c_client *client, int treble)
{
/* PATH1_EQ_TREBLE_VOL */
cx25840_and_or(client, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
}
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;
}
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);
}
}
static int get_mute(struct i2c_client *client)
{
struct cx25840_state *state = i2c_get_clientdata(client);
return state->unmute_volume >= 0;
}
static void set_mute(struct i2c_client *client, int mute)
{
struct cx25840_state *state = i2c_get_clientdata(client);
if (mute && state->unmute_volume == -1) {
int vol = get_volume(client);
set_volume(client, 0);
state->unmute_volume = vol;
}
else if (!mute && state->unmute_volume != -1) {
int vol = state->unmute_volume;
state->unmute_volume = -1;
set_volume(client, vol);
}
}
int cx25840_audio(struct i2c_client *client, unsigned int cmd, void *arg)
{
struct cx25840_state *state = i2c_get_clientdata(client);
struct v4l2_control *ctrl = arg;
int retval;
switch (cmd) {
case VIDIOC_INT_AUDIO_CLOCK_FREQ:
if (state->aud_input != CX25840_AUDIO_SERIAL) {
cx25840_and_or(client, 0x803, ~0x10, 0);
cx25840_write(client, 0x8d3, 0x1f);
}
if (!state->is_cx25836)
cx25840_and_or(client, 0x810, ~0x1, 1);
retval = set_audclk_freq(client, *(u32 *)arg);
if (!state->is_cx25836)
cx25840_and_or(client, 0x810, ~0x1, 0);
if (state->aud_input != CX25840_AUDIO_SERIAL) {
cx25840_and_or(client, 0x803, ~0x10, 0x10);
}
return retval;
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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