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Commit 4f751890 authored by Kevin Cheng's avatar Kevin Cheng Committed by Mauro Carvalho Chehab
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[media] lgdt3306a: support i2c mux for use by em28xx 



Adds an i2c mux to the lgdt3306a demodulator.  This was done to support
the Hauppauge WinTV-dualHD 01595 USB TV tuner (em28xx), which utilizes two
si2157 tuners behind gate control.

Signed-off-by: default avatarKevin Cheng <kcheng@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 3f706088

drivers/media/dvb-frontends/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -619,7 +619,7 @@ config DVB_LGDT3305 


config DVB_LGDT3306A

	tristate "LG Electronics LGDT3306A based"

	depends on DVB_CORE && I2C

	depends on DVB_CORE && I2C && I2C_MUX

	default m if !MEDIA_SUBDRV_AUTOSELECT

	help

	  An ATSC 8VSB and QAM-B 64/256 demodulator module. Say Y when you want

drivers/media/dvb-frontends/lgdt3306a.c

+108 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/dvb/frontend.h>

#include "dvb_math.h"

#include "lgdt3306a.h"

#include <linux/i2c-mux.h>





static int debug;
@@ -65,6 +66,8 @@ struct lgdt3306a_state { 
	enum fe_modulation current_modulation;

	u32 current_frequency;

	u32 snr;



	struct i2c_mux_core *muxc;

};



/*
@@ -2131,6 +2134,111 @@ static const struct dvb_frontend_ops lgdt3306a_ops = { 
	.search               = lgdt3306a_search,

};



static int lgdt3306a_select(struct i2c_mux_core *muxc, u32 chan)

{

	struct i2c_client *client = i2c_mux_priv(muxc);

	struct lgdt3306a_state *state = i2c_get_clientdata(client);



	return lgdt3306a_i2c_gate_ctrl(&state->frontend, 1);

}



static int lgdt3306a_deselect(struct i2c_mux_core *muxc, u32 chan)

{

	struct i2c_client *client = i2c_mux_priv(muxc);

	struct lgdt3306a_state *state = i2c_get_clientdata(client);



	return lgdt3306a_i2c_gate_ctrl(&state->frontend, 0);

}



static int lgdt3306a_probe(struct i2c_client *client,

		const struct i2c_device_id *id)

{

	struct lgdt3306a_config *config;

	struct lgdt3306a_state *state;

	struct dvb_frontend *fe;

	int ret;



	config = kzalloc(sizeof(struct lgdt3306a_config), GFP_KERNEL);

	if (config == NULL) {

		ret = -ENOMEM;

		goto fail;

	}



	memcpy(config, client->dev.platform_data,

			sizeof(struct lgdt3306a_config));



	config->i2c_addr = client->addr;

	fe = lgdt3306a_attach(config, client->adapter);

	if (fe == NULL) {

		ret = -ENODEV;

		goto err_fe;

	}



	i2c_set_clientdata(client, fe->demodulator_priv);

	state = fe->demodulator_priv;



	/* create mux i2c adapter for tuner */

	state->muxc = i2c_mux_alloc(client->adapter, &client->dev,

				  1, 0, I2C_MUX_LOCKED,

				  lgdt3306a_select, lgdt3306a_deselect);

	if (!state->muxc) {

		ret = -ENOMEM;

		goto err_kfree;

	}

	state->muxc->priv = client;

	ret = i2c_mux_add_adapter(state->muxc, 0, 0, 0);

	if (ret)

		goto err_kfree;



	/* create dvb_frontend */

	fe->ops.i2c_gate_ctrl = NULL;

	*config->i2c_adapter = state->muxc->adapter[0];

	*config->fe = fe;



	return 0;



err_kfree:

	kfree(state);

err_fe:

	kfree(config);

fail:

	dev_dbg(&client->dev, "failed=%d\n", ret);

	return ret;

}



static int lgdt3306a_remove(struct i2c_client *client)

{

	struct lgdt3306a_state *state = i2c_get_clientdata(client);



	i2c_mux_del_adapters(state->muxc);



	state->frontend.ops.release = NULL;

	state->frontend.demodulator_priv = NULL;



	kfree(state->cfg);

	kfree(state);



	return 0;

}



static const struct i2c_device_id lgdt3306a_id_table[] = {

	{"lgdt3306a", 0},

	{}

};

MODULE_DEVICE_TABLE(i2c, lgdt3306a_id_table);



static struct i2c_driver lgdt3306a_driver = {

	.driver = {

		.name                = "lgdt3306a",

		.suppress_bind_attrs = true,

	},

	.probe		= lgdt3306a_probe,

	.remove		= lgdt3306a_remove,

	.id_table	= lgdt3306a_id_table,

};



module_i2c_driver(lgdt3306a_driver);



MODULE_DESCRIPTION("LG Electronics LGDT3306A ATSC/QAM-B Demodulator Driver");

MODULE_AUTHOR("Fred Richter <frichter@hauppauge.com>");

MODULE_LICENSE("GPL");

drivers/media/dvb-frontends/lgdt3306a.h

+4 −0
Original line number Diff line number Diff line
@@ -56,6 +56,10 @@ struct lgdt3306a_config { 


	/* demod clock freq in MHz; 24 or 25 supported */

	int  xtalMHz;



	/* returned by driver if using i2c bus multiplexing */

	struct dvb_frontend **fe;

	struct i2c_adapter **i2c_adapter;

};



#if IS_REACHABLE(CONFIG_DVB_LGDT3306A)