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[media] tuner-core: Some cleanups at check_mode/set_mode 

Properly document those functions and do some cleanups around that.
There's just one behavior change on this patchset: it will now restore
TV frequency when changing from radio to TV mode.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2011-02-04 10:09:07 -03:00
parent 9f3f71ef6d
commit e2d25a2474
1 changed files with 42 additions and 30 deletions
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72
drivers/media/video/tuner-core.c
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@ -841,38 +841,39 @@ static void set_radio_freq(struct i2c_client *c, unsigned int freq)
analog_ops->set_params(&t->fe, &params);
}
/*
* Functions that should be broken into separate radio/TV functions
/**
* check_mode - Verify if tuner supports the requested mode
* @t - a pointer to the module's internal struct_tuner
*
* This function checks if the tuner is capable of tuning analog TV,
* digital TV or radio, depending on what the caller wants. If the
* tuner can't support that mode, it returns -EINVAL. Otherwise, it
* returns 0.
* This function is needed for boards that have a separate tuner for
* radio (like devices with tea5767).
*/
static inline int check_mode(struct tuner *t, char *cmd)
static inline int check_mode(struct tuner *t)
{
if ((1 << t->mode & t->mode_mask) == 0) {
return -EINVAL;
}
switch (t->mode) {
case V4L2_TUNER_RADIO:
tuner_dbg("Cmd %s accepted for radio\n", cmd);
break;
case V4L2_TUNER_ANALOG_TV:
tuner_dbg("Cmd %s accepted for analog TV\n", cmd);
break;
case V4L2_TUNER_DIGITAL_TV:
tuner_dbg("Cmd %s accepted for digital TV\n", cmd);
break;
}
return 0;
}
/*
* Switch tuner to other mode. If tuner support both tv and radio,
* set another frequency to some value (This is needed for some pal
* tuners to avoid locking). Otherwise, just put second tuner in
* standby mode.
/**
* set_mode - Switch tuner to other mode.
* @client - struct i2c_client pointer
* @t - a pointer to the module's internal struct_tuner
* @mode - enum v4l2_type + T_STANDBY mode
* @cmd - string for the command to be executed (for debug messages)
*
* If tuner doesn't support the needed mode (radio or TV), prints a
* debug message and returns -EINVAL, changing internal state to T_STANDBY.
* Otherwise, changes the state and sets frequency to the last value, if
* the tuner can sleep or if it supports both Radio and TV.
*/
static inline int set_mode(struct i2c_client *client, struct tuner *t, int mode, char *cmd)
static inline int set_mode(struct i2c_client *client, struct tuner *t,
int mode, char *cmd)
{
struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
@ -881,7 +882,7 @@ static inline int set_mode(struct i2c_client *client, struct tuner *t, int mode,
t->mode = mode;
if (check_mode(t, cmd) == -EINVAL) {
if (check_mode(t) == -EINVAL) {
tuner_dbg("Tuner doesn't support this mode. "
"Putting tuner to sleep\n");
t->mode = T_STANDBY;
@ -889,9 +890,22 @@ static inline int set_mode(struct i2c_client *client, struct tuner *t, int mode,
analog_ops->standby(&t->fe);
return -EINVAL;
}
if (t->mode == V4L2_TUNER_RADIO) {
if (t->radio_freq)
set_radio_freq(client, t->radio_freq);
} else {
if (t->tv_freq)
set_tv_freq(client, t->tv_freq);
}
return 0;
}
/*
* Functions that should be broken into separate radio/TV functions
*/
static void set_freq(struct i2c_client *c, unsigned long freq)
{
struct tuner *t = to_tuner(i2c_get_clientdata(c));
@ -959,7 +973,7 @@ static int tuner_s_power(struct v4l2_subdev *sd, int on)
tuner_dbg("Putting tuner to sleep\n");
if (check_mode(t, "s_power") == -EINVAL)
if (check_mode(t) == -EINVAL)
return 0;
t->mode = T_STANDBY;
if (analog_ops->standby)
@ -977,8 +991,6 @@ static int tuner_s_radio(struct v4l2_subdev *sd)
if (set_mode(client, t, V4L2_TUNER_RADIO, "s_radio") == -EINVAL)
return 0;
if (t->radio_freq)
set_freq(client, t->radio_freq);
return 0;
}
@ -1017,7 +1029,7 @@ static int tuner_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
struct tuner *t = to_tuner(sd);
struct dvb_tuner_ops *fe_tuner_ops = &t->fe.ops.tuner_ops;
if (check_mode(t, "g_frequency") == -EINVAL)
if (check_mode(t) == -EINVAL)
return 0;
f->type = t->mode;
if (fe_tuner_ops->get_frequency) {
@ -1040,7 +1052,7 @@ static int tuner_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
struct dvb_tuner_ops *fe_tuner_ops = &t->fe.ops.tuner_ops;
if (check_mode(t, "g_tuner") == -EINVAL)
if (check_mode(t) == -EINVAL)
return 0;
vt->type = t->mode;
@ -1081,7 +1093,7 @@ static int tuner_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
struct tuner *t = to_tuner(sd);
struct i2c_client *client = v4l2_get_subdevdata(sd);
if (check_mode(t, "s_tuner") == -EINVAL)
if (check_mode(t) == -EINVAL)
return 0;
/* do nothing unless we're a radio tuner */