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@xxxxxxxxx>
---
drivers/media/dvb-frontends/lgdt3306a.c | 108 ++++++++++++++++++++++++++++++++
drivers/media/dvb-frontends/lgdt3306a.h | 4 ++
2 files changed, 112 insertions(+)
diff --git a/drivers/media/dvb-frontends/lgdt3306a.c b/drivers/media/dvb-frontends/lgdt3306a.c
index 19dca46..b191e01 100644
--- a/drivers/media/dvb-frontends/lgdt3306a.c
+++ b/drivers/media/dvb-frontends/lgdt3306a.c
@@ -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 = client->dev.platform_data;
+ 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@xxxxxxxxxxxxx>");
MODULE_LICENSE("GPL");
diff --git a/drivers/media/dvb-frontends/lgdt3306a.h b/drivers/media/dvb-frontends/lgdt3306a.h
index 9dbb2dc..6ce337e 100644
--- a/drivers/media/dvb-frontends/lgdt3306a.h
+++ b/drivers/media/dvb-frontends/lgdt3306a.h
@@ -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)
--
2.9.3
--
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