Commit 5faff789 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab

V4L/DVB (9653): em28xx: improve AC97 handling

AC97 devices provide several input and outputs. However, before this
patch, em28xx device weren't properly allowing the usage of ac97
possible combinations. Also, several input volumes were left untouched,
instead of making sure that the volumes were set on mute state.

This patch improves support for ac97 devices by allowing to use any
inputs, and making sure that unused inputs are set on mute state.

Yet, some work is still needed to select the AC97 output.
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 16c7bcad
......@@ -298,29 +298,44 @@ static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
return 0;
}
static int set_ac97_em202_input(struct em28xx *dev)
struct em28xx_input_table {
enum em28xx_amux amux;
u8 reg;
};
static struct em28xx_input_table inputs[] = {
{ EM28XX_AMUX_VIDEO, AC97_VIDEO_VOL },
{ EM28XX_AMUX_LINE_IN, AC97_LINEIN_VOL },
{ EM28XX_AMUX_PHONE, AC97_PHONE_VOL },
{ EM28XX_AMUX_MIC, AC97_MIC_VOL },
{ EM28XX_AMUX_CD, AC97_CD_VOL },
{ EM28XX_AMUX_AUX, AC97_AUX_VOL },
{ EM28XX_AMUX_PCM_OUT, AC97_PCM_OUT_VOL },
};
static int set_ac97_input(struct em28xx *dev)
{
int ret;
u16 enable = 0x0808; /* 12 dB attenuation Left/Right */
u16 disable = 0x8808; /* bit 15 - mute volumme */
u16 video, line;
if (dev->ctl_ainput == EM28XX_AMUX_VIDEO) {
video = enable;
line = disable;
} else {
video = disable;
line = enable;
}
int ret, i;
enum em28xx_amux amux = dev->ctl_ainput;
/* Sets em202 AC97 mixer registers */
ret = em28xx_write_ac97(dev, AC97_VIDEO_VOL, video);
if (ret < 0)
return ret;
/* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
em28xx should point to LINE IN, while AC97 should use VIDEO
*/
if (amux == EM28XX_AMUX_VIDEO2)
amux = dev->ctl_ainput;
ret = em28xx_write_ac97(dev, AC97_LINEIN_VOL, line);
/* Mute all entres but the one that were selected */
for (i = 0; i < ARRAY_SIZE(inputs); i++) {
if (amux == inputs[i].amux)
ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
else
ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
return ret;
if (ret < 0)
em28xx_warn("couldn't setup AC97 register %d\n",
inputs[i].reg);
}
return 0;
}
static int em28xx_set_audio_source(struct em28xx *dev)
......@@ -329,10 +344,10 @@ static int em28xx_set_audio_source(struct em28xx *dev)
u8 input;
if (dev->is_em2800) {
if (dev->ctl_ainput)
input = EM2800_AUDIO_SRC_LINE;
else
if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
input = EM2800_AUDIO_SRC_TUNER;
else
input = EM2800_AUDIO_SRC_LINE;
ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
if (ret < 0)
......@@ -360,16 +375,11 @@ static int em28xx_set_audio_source(struct em28xx *dev)
switch (dev->audio_mode.ac97) {
case EM28XX_NO_AC97:
break;
case EM28XX_AC97_OTHER:
/* We don't know how to handle this chip.
Let's hope it is close enough to em202 to work
*/
case EM28XX_AC97_EM202:
ret = set_ac97_em202_input(dev);
break;
default:
ret = set_ac97_input(dev);
}
return 0;
return ret;
}
int em28xx_audio_analog_set(struct em28xx *dev)
......@@ -380,6 +390,9 @@ int em28xx_audio_analog_set(struct em28xx *dev)
if (!dev->audio_mode.has_audio)
return 0;
/* It is assumed that all devices use master volume for output.
It would be possible to use also line output.
*/
if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
/* Mute */
ret = em28xx_write_ac97(dev, AC97_MASTER_VOL, 0x8000);
......
......@@ -130,10 +130,13 @@ enum em28xx_chip_id {
/* Standard AC97 registers */
#define AC97_RESET 0x00
/* Output volumes */
#define AC97_MASTER_VOL 0x02
#define AC97_LINE_LEVEL_VOL 0x04
#define AC97_LINE_LEVEL_VOL 0x04 /* Some devices use for headphones */
#define AC97_MASTER_MONO_VOL 0x06
/* Input volumes */
#define AC97_PC_BEEP_VOL 0x0a
#define AC97_PHONE_VOL 0x0c
#define AC97_MIC_VOL 0x0e
......@@ -142,8 +145,12 @@ enum em28xx_chip_id {
#define AC97_VIDEO_VOL 0x14
#define AC97_AUX_VOL 0x16
#define AC97_PCM_OUT_VOL 0x18
/* capture registers */
#define AC97_RECORD_SELECT 0x1a
#define AC97_RECORD_GAIN 0x1c
/* control registers */
#define AC97_GENERAL_PURPOSE 0x20
#define AC97_3D_CTRL 0x22
#define AC97_AUD_INT_AND_PAG 0x24
......@@ -158,10 +165,15 @@ enum em28xx_chip_id {
#define AC97_PCM_OUT_SURR_SRATE 0x2e
#define AC97_PCM_OUT_LFE_SRATE 0x30
#define AC97_PCM_IN_SRATE 0x32
/* For devices with more than 2 channels, extra output volumes */
#define AC97_LFE_MASTER_VOL 0x36
#define AC97_SURR_MASTER_VOL 0x38
/* Digital SPDIF output control */
#define AC97_SPDIF_OUT_CTRL 0x3a
/* Vendor ID identifier */
#define AC97_VENDOR_ID1 0x7c
#define AC97_VENDOR_ID2 0x7e
......
......@@ -274,9 +274,25 @@ struct em28xx_audio_mode {
unsigned int i2s_5rates:1;
};
/* em28xx has two audio inputs: tuner and line in.
However, on most devices, an auxiliary AC97 codec device is used.
The AC97 device may have several different inputs and outputs,
depending on their model. So, it is possible to use AC97 mixer to
address more than two different entries.
*/
enum em28xx_amux {
EM28XX_AMUX_VIDEO,
EM28XX_AMUX_LINE_IN,
/* This is the only entry for em28xx tuner input */
EM28XX_AMUX_VIDEO, /* em28xx tuner, AC97 mixer Video */
EM28XX_AMUX_LINE_IN, /* AC97 mixer Line In */
/* Some less-common mixer setups */
EM28XX_AMUX_VIDEO2, /* em28xx Line in, AC97 mixer Video */
EM28XX_AMUX_PHONE,
EM28XX_AMUX_MIC,
EM28XX_AMUX_CD,
EM28XX_AMUX_AUX,
EM28XX_AMUX_PCM_OUT,
};
struct em28xx_input {
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment