/*
- *
* i2c tv tuner chip device driver
* core core, i.e. kernel interfaces, registering and so on
+ *
+ * Copyright(c) by Ralph Metzler, Gerd Knorr, Gunther Mayer
+ *
+ * Copyright(c) 2005-2011 by Mauro Carvalho Chehab
+ * - Added support for a separate Radio tuner
+ * - Major rework and cleanups at the code
+ *
+ * This driver supports many devices and the idea is to let the driver
+ * detect which device is present. So rather than listing all supported
+ * devices here, we pretend to support a single, fake device type that will
+ * handle both radio and analog TV tuning.
*/
#include <linux/module.h>
*/
static LIST_HEAD(tuner_list);
+static const struct v4l2_subdev_ops tuner_ops;
/*
* Debug macros
const char *name;
};
+/*
+ * Function prototypes
+ */
+
+static void set_tv_freq(struct i2c_client *c, unsigned int freq);
+static void set_radio_freq(struct i2c_client *c, unsigned int freq);
+
/*
* tuner attach/detach logic
*/
};
/*
- * Functions that are common to both TV and radio
+ * Functions to select between radio and TV and tuner probe/remove functions
*/
-static void set_tv_freq(struct i2c_client *c, unsigned int freq);
-static void set_radio_freq(struct i2c_client *c, unsigned int freq);
-static const struct v4l2_subdev_ops tuner_ops;
-
+/**
+ * set_type - Sets the tuner type for a given device
+ *
+ * @c: i2c_client descriptoy
+ * @type: type of the tuner (e. g. tuner number)
+ * @new_mode_mask: Indicates if tuner supports TV and/or Radio
+ * @new_config: an optional parameter ranging from 0-255 used by
+ a few tuners to adjust an internal parameter,
+ like LNA mode
+ * @tuner_callback: an optional function to be called when switching
+ * to analog mode
+ *
+ * This function applys the tuner config to tuner specified
+ * by tun_setup structure. It contains several per-tuner initialization "magic"
+ */
static void set_type(struct i2c_client *c, unsigned int type,
unsigned int new_mode_mask, unsigned int new_config,
int (*tuner_callback) (void *dev, int component, int cmd, int arg))
return 0;
}
+/**
+ * tuner_s_config - Sets tuner configuration
+ *
+ * @sd: subdev descriptor
+ * @cfg: tuner configuration
+ *
+ * Calls tuner set_config() private function to set some tuner-internal
+ * parameters
+ */
static int tuner_s_config(struct v4l2_subdev *sd,
const struct v4l2_priv_tun_config *cfg)
{
return 0;
}
-/* Search for existing radio and/or TV tuners on the given I2C adapter.
- Note that when this function is called from tuner_probe you can be
- certain no other devices will be added/deleted at the same time, I2C
- core protects against that. */
+/**
+ * tuner_lookup - Seek for tuner adapters
+ *
+ * @adap: i2c_adapter struct
+ * @radio: pointer to be filled if the adapter is radio
+ * @tv: pointer to be filled if the adapter is TV
+ *
+ * Search for existing radio and/or TV tuners on the given I2C adapter,
+ * discarding demod-only adapters (tda9887).
+ *
+ * Note that when this function is called from tuner_probe you can be
+ * certain no other devices will be added/deleted at the same time, I2C
+ * core protects against that.
+ */
static void tuner_lookup(struct i2c_adapter *adap,
struct tuner **radio, struct tuner **tv)
{
continue;
mode_mask = pos->mode_mask;
- pos->standby = 1;
if (*radio == NULL && mode_mask == T_RADIO)
*radio = pos;
/* Note: currently TDA9887 is the only demod-only
device. If other devices appear then we need to
make this test more general. */
else if (*tv == NULL && pos->type != TUNER_TDA9887 &&
- (pos->mode_mask & (T_ANALOG_TV | T_DIGITAL_TV)))
+ (pos->mode_mask & T_ANALOG_TV))
*tv = pos;
}
}
-/* During client attach, set_type is called by adapter's attach_inform callback.
- set_type must then be completed by tuner_probe.
+/**
+ *tuner_probe - Probes the existing tuners on an I2C bus
+ *
+ * @client: i2c_client descriptor
+ * @id: not used
+ *
+ * This routine probes for tuners at the expected I2C addresses. On most
+ * cases, if a device answers to a given I2C address, it assumes that the
+ * device is a tuner. On a few cases, however, an additional logic is needed
+ * to double check if the device is really a tuner, or to identify the tuner
+ * type, like on tea5767/5761 devices.
+ *
+ * During client attach, set_type is called by adapter's attach_inform callback.
+ * set_type must then be completed by tuner_probe.
*/
static int tuner_probe(struct i2c_client *client,
const struct i2c_device_id *id)
} else {
/* Default is being tda9887 */
t->type = TUNER_TDA9887;
- t->mode_mask = T_RADIO | T_ANALOG_TV |
- T_DIGITAL_TV;
+ t->mode_mask = T_RADIO | T_ANALOG_TV;
goto register_client;
}
break;
first found TV tuner. */
tuner_lookup(t->i2c->adapter, &radio, &tv);
if (tv == NULL) {
- t->mode_mask = T_ANALOG_TV | T_DIGITAL_TV;
+ t->mode_mask = T_ANALOG_TV;
if (radio == NULL)
t->mode_mask |= T_RADIO;
tuner_dbg("Setting mode_mask to 0x%02x\n", t->mode_mask);
/* Sets a default mode */
if (t->mode_mask & T_ANALOG_TV)
t->mode = V4L2_TUNER_ANALOG_TV;
- else if (t->mode_mask & T_RADIO)
- t->mode = V4L2_TUNER_RADIO;
else
- t->mode = V4L2_TUNER_DIGITAL_TV;
+ t->mode = V4L2_TUNER_RADIO;
set_type(client, t->type, t->mode_mask, t->config, t->fe.callback);
list_add_tail(&t->list, &tuner_list);
- tuner_info("Tuner %d found with type(s)%s%s%s.\n",
+ tuner_info("Tuner %d found with type(s)%s%s.\n",
t->type,
- t->mode_mask & T_RADIO ? " radio" : "",
- t->mode_mask & T_ANALOG_TV ? " TV" : "",
- t->mode_mask & T_ANALOG_TV ? " DTV" : "");
+ t->mode_mask & T_RADIO ? " Radio" : "",
+ t->mode_mask & T_ANALOG_TV ? " TV" : "");
return 0;
}
+/**
+ * tuner_remove - detaches a tuner
+ *
+ * @client: i2c_client descriptor
+ */
+
static int tuner_remove(struct i2c_client *client)
{
struct tuner *t = to_tuner(i2c_get_clientdata(client));
return 0;
}
+/*
+ * Functions to switch between Radio and TV
+ *
+ * A few cards have a separate I2C tuner for radio. Those routines
+ * take care of switching between TV/Radio mode, filtering only the
+ * commands that apply to the Radio or TV tuner.
+ */
+
+/**
+ * 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, enum v4l2_tuner_type mode)
+{
+ if ((1 << mode & t->mode_mask) == 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * set_mode_freq - Switch tuner to other mode.
+ * @client: struct i2c_client pointer
+ * @t: a pointer to the module's internal struct_tuner
+ * @mode: enum v4l2_type (radio or TV)
+ * @freq: frequency to set (0 means to use the previous one)
+ *
+ * If tuner doesn't support the needed mode (radio or TV), prints a
+ * debug message and returns -EINVAL, changing its state to 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 int set_mode_freq(struct i2c_client *client, struct tuner *t,
+ enum v4l2_tuner_type mode, unsigned int freq)
+{
+ struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
+
+ if (mode != t->mode) {
+ if (check_mode(t, mode) == -EINVAL) {
+ tuner_dbg("Tuner doesn't support mode %d. "
+ "Putting tuner to sleep\n", mode);
+ t->standby = true;
+ if (analog_ops->standby)
+ analog_ops->standby(&t->fe);
+ return -EINVAL;
+ }
+ t->mode = mode;
+ tuner_dbg("Changing to mode %d\n", mode);
+ }
+ if (t->mode == V4L2_TUNER_RADIO) {
+ if (freq)
+ t->radio_freq = freq;
+ set_radio_freq(client, t->radio_freq);
+ } else {
+ if (freq)
+ t->tv_freq = freq;
+ set_tv_freq(client, t->tv_freq);
+ }
+
+ return 0;
+}
+
/*
* Functions that are specific for TV mode
*/
-/* Set tuner frequency, freq in Units of 62.5kHz = 1/16MHz */
+/**
+ * set_tv_freq - Set tuner frequency, freq in Units of 62.5 kHz = 1/16MHz
+ *
+ * @c: i2c_client descriptor
+ * @freq: frequency
+ */
static void set_tv_freq(struct i2c_client *c, unsigned int freq)
{
struct tuner *t = to_tuner(i2c_get_clientdata(c));
analog_ops->set_params(&t->fe, ¶ms);
}
-/* get more precise norm info from insmod option */
+/**
+ * tuner_fixup_std - force a given video standard variant
+ *
+ * @t: tuner internal struct
+ *
+ * A few devices or drivers have problem to detect some standard variations.
+ * On other operational systems, the drivers generally have a per-country
+ * code, and some logic to apply per-country hacks. V4L2 API doesn't provide
+ * such hacks. Instead, it relies on a proper video standard selection from
+ * the userspace application. However, as some apps are buggy, not allowing
+ * to distinguish all video standard variations, a modprobe parameter can
+ * be used to force a video standard match.
+ */
static int tuner_fixup_std(struct tuner *t)
{
if ((t->std & V4L2_STD_PAL) == V4L2_STD_PAL) {
* Functions that are specific for Radio mode
*/
+/**
+ * set_radio_freq - Set tuner frequency, freq in Units of 62.5 Hz = 1/16kHz
+ *
+ * @c: i2c_client descriptor
+ * @freq: frequency
+ */
static void set_radio_freq(struct i2c_client *c, unsigned int freq)
{
struct tuner *t = to_tuner(i2c_get_clientdata(c));
analog_ops->set_params(&t->fe, ¶ms);
}
-/**
- * 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, enum v4l2_tuner_type mode)
-{
- if ((1 << mode & t->mode_mask) == 0)
- return -EINVAL;
-
- return 0;
-}
-
-/**
- * set_mode_freq - Switch tuner to other mode.
- * @client: struct i2c_client pointer
- * @t: a pointer to the module's internal struct_tuner
- * @mode: enum v4l2_type (radio or TV)
- * @freq: frequency to set (0 means to use the previous one)
- *
- * 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.
+/*
+ * Debug function for reporting tuner status to userspace
*/
-static int set_mode_freq(struct i2c_client *client, struct tuner *t,
- enum v4l2_tuner_type mode, unsigned int freq)
-{
- struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
-
- if (mode != t->mode) {
- if (check_mode(t, mode) == -EINVAL) {
- tuner_dbg("Tuner doesn't support mode %d. "
- "Putting tuner to sleep\n", mode);
- t->standby = true;
- if (analog_ops->standby)
- analog_ops->standby(&t->fe);
- return -EINVAL;
- }
- t->mode = mode;
- tuner_dbg("Changing to mode %d\n", mode);
- }
- if (t->mode == V4L2_TUNER_RADIO) {
- if (freq)
- t->radio_freq = freq;
- set_radio_freq(client, t->radio_freq);
- } else {
- if (freq)
- t->tv_freq = freq;
- set_tv_freq(client, t->tv_freq);
- }
-
- return 0;
-}
/**
* tuner_status - Dumps the current tuner status at dmesg
analog_ops->has_signal(fe));
}
+/*
+ * Function to splicitly change mode to radio. Probably not needed anymore
+ */
+
+static int tuner_s_radio(struct v4l2_subdev *sd)
+{
+ struct tuner *t = to_tuner(sd);
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+ if (set_mode_freq(client, t, V4L2_TUNER_RADIO, 0) == -EINVAL)
+ return 0;
+ return 0;
+}
+
+/*
+ * Tuner callbacks to handle userspace ioctl's
+ */
+
/**
* tuner_s_power - controls the power state of the tuner
* @sd: pointer to struct v4l2_subdev
return 0;
}
-/* ---------------------------------------------------------------------- */
-
-static int tuner_s_radio(struct v4l2_subdev *sd)
-{
- struct tuner *t = to_tuner(sd);
- struct i2c_client *client = v4l2_get_subdevdata(sd);
-
- if (set_mode_freq(client, t, V4L2_TUNER_RADIO, 0) == -EINVAL)
- return 0;
- return 0;
-}
-
-/* --- v4l ioctls --- */
-/* take care: bttv does userspace copying, we'll get a
- kernel pointer here... */
static int tuner_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
{
struct tuner *t = to_tuner(sd);
return -ENOIOCTLCMD;
}
-/* ----------------------------------------------------------------------- */
+/*
+ * Callback structs
+ */
static const struct v4l2_subdev_core_ops tuner_core_ops = {
.log_status = tuner_log_status,
.tuner = &tuner_tuner_ops,
};
-/* ----------------------------------------------------------------------- */
+/*
+ * I2C structs and module init functions
+ */
-/* This driver supports many devices and the idea is to let the driver
- detect which device is present. So rather than listing all supported
- devices here, we pretend to support a single, fake device type. */
static const struct i2c_device_id tuner_id[] = {
{ "tuner", }, /* autodetect */
{ }
git.openpandora.org / pandora-kernel.git / blobdiff