Based on other included backports.
Includes unlocked i2c gate control callbacks.
Signed-off-by: Brad Love <b...@nextdimension.cc>
---
backports/v4.6_i2c_mux.patch | 213 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 213 insertions(+)
diff --git a/backports/v4.6_i2c_mux.patch b/backports/v4.6_i2c_mux.patch
index 8f1ab88..ce89faa 100644
--- a/backports/v4.6_i2c_mux.patch
+++ b/backports/v4.6_i2c_mux.patch
@@ -1455,3 +1455,216 @@ index c76e78f..5c805f8 100644
pdata.dvb_frontend = adap->fe[0];
pdata.dvb_usb_device = d;
pdata.v4l2_subdev = subdev;
+diff --git a/drivers/media/dvb-frontends/lgdt3306a.c
b/drivers/media/dvb-frontends/lgdt3306a.c
+index ab16d3a..2988262 100644
+--- a/drivers/media/dvb-frontends/lgdt3306a.c
++++ b/drivers/media/dvb-frontends/lgdt3306a.c
+@@ -79,8 +79,6 @@ struct lgdt3306a_state {
+ enum fe_modulation current_modulation;
+ u32 current_frequency;
+ u32 snr;
+-
+- struct i2c_mux_core *muxc;
+ };
+
+ /*
+@@ -2182,20 +2180,142 @@ static const struct dvb_frontend_ops lgdt3306a_ops = {
+ .search = lgdt3306a_search,
+ };
+
+-static int lgdt3306a_select(struct i2c_mux_core *muxc, u32 chan)
++/*
++ * I2C gate logic
++ * We must use unlocked I2C I/O because I2C adapter lock is already taken
++ * by the caller (usually tuner driver).
++ * select/unselect are unlocked versions of lgdt3306a_i2c_gate_ctrl
++ */
++static int lgdt3306a_select(struct i2c_adapter *adap, void *mux_priv, u32
chan)
+ {
+- struct i2c_client *client = i2c_mux_priv(muxc);
+- struct lgdt3306a_state *state = i2c_get_clientdata(client);
++ struct i2c_client *client = mux_priv;
++ int ret;
++ u8 val;
++ u8 buf[3];
++
++ struct i2c_msg read_msg_1 = {
++ .addr = client->addr,
++ .flags = 0,
++ .buf = "\x00\x02",
++ .len = 2,
++ };
++ struct i2c_msg read_msg_2 = {
++ .addr = client->addr,
++ .flags = I2C_M_RD,
++ .buf = &val,
++ .len = 1,
++ };
++
++ struct i2c_msg write_msg = {
++ .addr = client->addr,
++ .flags = 0,
++ .len = 3,
++ .buf = buf,
++ };
++
++ ret = __i2c_transfer(client->adapter, &read_msg_1, 1);
++ if (ret != 1)
++ {
++ pr_err("error (addr %02x reg 0x002 error (ret == %i)\n",
++ client->addr, ret);
++ if (ret < 0)
++ return ret;
++ else
++ return -EREMOTEIO;
++ }
+
+- return lgdt3306a_i2c_gate_ctrl(&state->frontend, 1);
++ ret = __i2c_transfer(client->adapter, &read_msg_2, 1);
++ if (ret != 1)
++ {
++ pr_err("error (addr %02x reg 0x002 error (ret == %i)\n",
++ client->addr, ret);
++ if (ret < 0)
++ return ret;
++ else
++ return -EREMOTEIO;
++ }
++
++ buf[0] = 0x00;
++ buf[1] = 0x02;
++ val &= 0x7F;
++ val |= LG3306_TUNERI2C_ON;
++ buf[2] = val;
++ ret = __i2c_transfer(client->adapter, &write_msg, 1);
++ if (ret != 1) {
++ pr_err("error (addr %02x %02x <- %02x, err = %i)\n",
++ write_msg.buf[0], write_msg.buf[1], write_msg.buf[2],
ret);
++ if (ret < 0)
++ return ret;
++ else
++ return -EREMOTEIO;
++ }
++ return 0;
+ }
+
+-static int lgdt3306a_deselect(struct i2c_mux_core *muxc, u32 chan)
++static int lgdt3306a_deselect(struct i2c_adapter *adap, void *mux_priv, u32
chan)
+ {
+- struct i2c_client *client = i2c_mux_priv(muxc);
+- struct lgdt3306a_state *state = i2c_get_clientdata(client);
++ struct i2c_client *client = mux_priv;
++ int ret;
++ u8 val;
++ u8 buf[3];
++
++ struct i2c_msg read_msg_1 = {
++ .addr = client->addr,
++ .flags = 0,
++ .buf = "\x00\x02",
++ .len = 2,
++ };
++ struct i2c_msg read_msg_2 = {
++ .addr = client->addr,
++ .flags = I2C_M_RD,
++ .buf = &val,
++ .len = 1,
++ };
+
+- return lgdt3306a_i2c_gate_ctrl(&state->frontend, 0);
++ struct i2c_msg write_msg = {
++ .addr = client->addr,
++ .flags = 0,
++ .len = 3,
++ .buf = buf,
++ };
++
++ ret = __i2c_transfer(client->adapter, &read_msg_1, 1);
++ if (ret != 1)
++ {
++ pr_err("error (addr %02x reg 0x002 error (ret == %i)\n",
++ client->addr, ret);
++ if (ret < 0)
++ return ret;
++ else
++ return -EREMOTEIO;
++ }
++
++ ret = __i2c_transfer(client->adapter, &read_msg_2, 1);
++ if (ret != 1)
++ {
++ pr_err("error (addr %02x reg 0x002 error (ret == %i)\n",
++ client->addr, ret);
++ if (ret < 0)
++ return ret;
++ else
++ return -EREMOTEIO;
++ }
++
++ buf[0] = 0x00;
++ buf[1] = 0x02;
++ val &= 0x7F;
++ val |= LG3306_TUNERI2C_OFF;
++ buf[2] = val;
++ ret = __i2c_transfer(client->adapter, &write_msg, 1);
++ if (ret != 1) {
++ pr_err("error (addr %02x %02x <- %02x, err = %i)\n",
++ write_msg.buf[0], write_msg.buf[1], write_msg.buf[2],
ret);
++ if (ret < 0)
++ return ret;
++ else
++ return -EREMOTEIO;
++ }
++ return 0;
+ }
+
+ static int lgdt3306a_probe(struct i2c_client *client,
+@@ -2227,21 +2347,16 @@ static int lgdt3306a_probe(struct i2c_client *client,
+ state->frontend.ops.release = NULL;
+
+ /* 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;
++ state->i2c_adap = i2c_add_mux_adapter(client->adapter, &client->dev,
++ client, 0, 0, 0, lgdt3306a_select, lgdt3306a_deselect);
++ if (state->i2c_adap == NULL) {
++ ret = -ENODEV;
+ 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->i2c_adapter = state->i2c_adap;
+ *config->fe = fe;
+
+ dev_info(&client->dev, "LG Electronics LGDT3306A successfully
identified\n");
+@@ -2261,7 +2376,7 @@ static int lgdt3306a_remove(struct i2c_client *client)
+ {
+ struct lgdt3306a_state *state = i2c_get_clientdata(client);
+
+- i2c_mux_del_adapters(state->muxc);
++ i2c_del_mux_adapter(state->i2c_adap);
+
+ state->frontend.ops.release = NULL;
+ state->frontend.demodulator_priv = NULL;
+diff --git a/drivers/media/dvb-frontends/lgdt3306a.h
b/drivers/media/dvb-frontends/lgdt3306a.h
+index 8b53044..99b28be 100644
+--- a/drivers/media/dvb-frontends/lgdt3306a.h
++++ b/drivers/media/dvb-frontends/lgdt3306a.h
+@@ -21,6 +21,8 @@
+ #include <linux/i2c.h>
+ #include <media/dvb_frontend.h>
+
++#define LG3306_TUNERI2C_ON 0x00
++#define LG3306_TUNERI2C_OFF 0x80
+
+ enum lgdt3306a_mpeg_mode {
+ LGDT3306A_MPEG_PARALLEL = 0,
--
2.7.4
