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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: Kevin Cheng <kcheng@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Kevin Cheng 2017-01-10 01:14:18 -02:00 committed by Mauro Carvalho Chehab
parent 3f70608872
commit 4f75189024
3 changed files with 113 additions and 1 deletions
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2
drivers/media/dvb-frontends/Kconfig
View File

@ -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

108
drivers/media/dvb-frontends/lgdt3306a.c
View File

@ -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");

4
drivers/media/dvb-frontends/lgdt3306a.h
View File

@ -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)