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path: root/drivers/media/dvb-frontends/rtl2832.c
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Diffstat (limited to 'drivers/media/dvb-frontends/rtl2832.c')
-rw-r--r--drivers/media/dvb-frontends/rtl2832.c191
1 files changed, 169 insertions, 22 deletions
diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c
index ff73da9365e3..fdbed35c87fa 100644
--- a/drivers/media/dvb-frontends/rtl2832.c
+++ b/drivers/media/dvb-frontends/rtl2832.c
@@ -24,11 +24,6 @@
/* Max transfer size done by I2C transfer functions */
#define MAX_XFER_SIZE 64
-
-int rtl2832_debug;
-module_param_named(debug, rtl2832_debug, int, 0644);
-MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
-
#define REG_MASK(b) (BIT(b + 1) - 1)
static const struct rtl2832_reg_entry registers[] = {
@@ -185,12 +180,13 @@ static int rtl2832_wr(struct rtl2832_priv *priv, u8 reg, u8 *val, int len)
buf[0] = reg;
memcpy(&buf[1], val, len);
- ret = i2c_transfer(priv->i2c, msg, 1);
+ ret = i2c_transfer(priv->i2c_adapter, msg, 1);
if (ret == 1) {
ret = 0;
} else {
- dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
- "len=%d\n", KBUILD_MODNAME, ret, reg, len);
+ dev_warn(&priv->i2c->dev,
+ "%s: i2c wr failed=%d reg=%02x len=%d\n",
+ KBUILD_MODNAME, ret, reg, len);
ret = -EREMOTEIO;
}
return ret;
@@ -214,12 +210,13 @@ static int rtl2832_rd(struct rtl2832_priv *priv, u8 reg, u8 *val, int len)
}
};
- ret = i2c_transfer(priv->i2c, msg, 2);
+ ret = i2c_transfer(priv->i2c_adapter, msg, 2);
if (ret == 2) {
ret = 0;
} else {
- dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
- "len=%d\n", KBUILD_MODNAME, ret, reg, len);
+ dev_warn(&priv->i2c->dev,
+ "%s: i2c rd failed=%d reg=%02x len=%d\n",
+ KBUILD_MODNAME, ret, reg, len);
ret = -EREMOTEIO;
}
return ret;
@@ -417,7 +414,7 @@ static int rtl2832_set_if(struct dvb_frontend *fe, u32 if_freq)
ret = rtl2832_wr_demod_reg(priv, DVBT_PSET_IFFREQ, pset_iffreq);
- return (ret);
+ return ret;
}
static int rtl2832_init(struct dvb_frontend *fe)
@@ -514,15 +511,10 @@ static int rtl2832_init(struct dvb_frontend *fe)
goto err;
}
- if (!fe->ops.tuner_ops.get_if_frequency) {
- ret = rtl2832_set_if(fe, priv->cfg.if_dvbt);
- if (ret)
- goto err;
- }
-
/*
* r820t NIM code does a software reset here at the demod -
- * may not be needed, as there's already a software reset at set_params()
+ * may not be needed, as there's already a software reset at
+ * set_params()
*/
#if 1
/* soft reset */
@@ -599,9 +591,9 @@ static int rtl2832_set_frontend(struct dvb_frontend *fe)
};
- dev_dbg(&priv->i2c->dev, "%s: frequency=%d bandwidth_hz=%d " \
- "inversion=%d\n", __func__, c->frequency,
- c->bandwidth_hz, c->inversion);
+ dev_dbg(&priv->i2c->dev,
+ "%s: frequency=%d bandwidth_hz=%d inversion=%d\n",
+ __func__, c->frequency, c->bandwidth_hz, c->inversion);
/* program tuner */
if (fe->ops.tuner_ops.set_params)
@@ -899,9 +891,149 @@ static void rtl2832_release(struct dvb_frontend *fe)
struct rtl2832_priv *priv = fe->demodulator_priv;
dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
+ cancel_delayed_work_sync(&priv->i2c_gate_work);
+ i2c_del_mux_adapter(priv->i2c_adapter_tuner);
+ i2c_del_mux_adapter(priv->i2c_adapter);
kfree(priv);
}
+/*
+ * Delay mechanism to avoid unneeded I2C gate open / close. Gate close is
+ * delayed here a little bit in order to see if there is sequence of I2C
+ * messages sent to same I2C bus.
+ * We must use unlocked version of __i2c_transfer() in order to avoid deadlock
+ * as lock is already taken by calling muxed i2c_transfer().
+ */
+static void rtl2832_i2c_gate_work(struct work_struct *work)
+{
+ struct rtl2832_priv *priv = container_of(work,
+ struct rtl2832_priv, i2c_gate_work.work);
+ struct i2c_adapter *adap = priv->i2c;
+ int ret;
+ u8 buf[2];
+ struct i2c_msg msg[1] = {
+ {
+ .addr = priv->cfg.i2c_addr,
+ .flags = 0,
+ .len = sizeof(buf),
+ .buf = buf,
+ }
+ };
+
+ /* select reg bank 1 */
+ buf[0] = 0x00;
+ buf[1] = 0x01;
+ ret = __i2c_transfer(adap, msg, 1);
+ if (ret != 1)
+ goto err;
+
+ priv->page = 1;
+
+ /* close I2C repeater gate */
+ buf[0] = 0x01;
+ buf[1] = 0x10;
+ ret = __i2c_transfer(adap, msg, 1);
+ if (ret != 1)
+ goto err;
+
+ priv->i2c_gate_state = 0;
+
+ return;
+err:
+ dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
+
+ return;
+}
+
+static int rtl2832_select(struct i2c_adapter *adap, void *mux_priv, u32 chan_id)
+{
+ struct rtl2832_priv *priv = mux_priv;
+ int ret;
+ u8 buf[2], val;
+ struct i2c_msg msg[1] = {
+ {
+ .addr = priv->cfg.i2c_addr,
+ .flags = 0,
+ .len = sizeof(buf),
+ .buf = buf,
+ }
+ };
+ struct i2c_msg msg_rd[2] = {
+ {
+ .addr = priv->cfg.i2c_addr,
+ .flags = 0,
+ .len = 1,
+ .buf = "\x01",
+ }, {
+ .addr = priv->cfg.i2c_addr,
+ .flags = I2C_M_RD,
+ .len = 1,
+ .buf = &val,
+ }
+ };
+
+ /* terminate possible gate closing */
+ cancel_delayed_work_sync(&priv->i2c_gate_work);
+
+ if (priv->i2c_gate_state == chan_id)
+ return 0;
+
+ /* select reg bank 1 */
+ buf[0] = 0x00;
+ buf[1] = 0x01;
+ ret = __i2c_transfer(adap, msg, 1);
+ if (ret != 1)
+ goto err;
+
+ priv->page = 1;
+
+ /* we must read that register, otherwise there will be errors */
+ ret = __i2c_transfer(adap, msg_rd, 2);
+ if (ret != 2)
+ goto err;
+
+ /* open or close I2C repeater gate */
+ buf[0] = 0x01;
+ if (chan_id == 1)
+ buf[1] = 0x18; /* open */
+ else
+ buf[1] = 0x10; /* close */
+
+ ret = __i2c_transfer(adap, msg, 1);
+ if (ret != 1)
+ goto err;
+
+ priv->i2c_gate_state = chan_id;
+
+ return 0;
+err:
+ dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
+
+ return -EREMOTEIO;
+}
+
+static int rtl2832_deselect(struct i2c_adapter *adap, void *mux_priv,
+ u32 chan_id)
+{
+ struct rtl2832_priv *priv = mux_priv;
+ schedule_delayed_work(&priv->i2c_gate_work, usecs_to_jiffies(100));
+ return 0;
+}
+
+struct i2c_adapter *rtl2832_get_i2c_adapter(struct dvb_frontend *fe)
+{
+ struct rtl2832_priv *priv = fe->demodulator_priv;
+ return priv->i2c_adapter_tuner;
+}
+EXPORT_SYMBOL(rtl2832_get_i2c_adapter);
+
+struct i2c_adapter *rtl2832_get_private_i2c_adapter(struct dvb_frontend *fe)
+{
+ struct rtl2832_priv *priv = fe->demodulator_priv;
+ return priv->i2c_adapter;
+}
+EXPORT_SYMBOL(rtl2832_get_private_i2c_adapter);
+
struct dvb_frontend *rtl2832_attach(const struct rtl2832_config *cfg,
struct i2c_adapter *i2c)
{
@@ -920,12 +1052,25 @@ struct dvb_frontend *rtl2832_attach(const struct rtl2832_config *cfg,
priv->i2c = i2c;
priv->tuner = cfg->tuner;
memcpy(&priv->cfg, cfg, sizeof(struct rtl2832_config));
+ INIT_DELAYED_WORK(&priv->i2c_gate_work, rtl2832_i2c_gate_work);
+
+ /* create muxed i2c adapter for demod itself */
+ priv->i2c_adapter = i2c_add_mux_adapter(i2c, &i2c->dev, priv, 0, 0, 0,
+ rtl2832_select, NULL);
+ if (priv->i2c_adapter == NULL)
+ goto err;
/* check if the demod is there */
ret = rtl2832_rd_reg(priv, 0x00, 0x0, &tmp);
if (ret)
goto err;
+ /* create muxed i2c adapter for demod tuner bus */
+ priv->i2c_adapter_tuner = i2c_add_mux_adapter(i2c, &i2c->dev, priv,
+ 0, 1, 0, rtl2832_select, rtl2832_deselect);
+ if (priv->i2c_adapter_tuner == NULL)
+ goto err;
+
/* create dvb_frontend */
memcpy(&priv->fe.ops, &rtl2832_ops, sizeof(struct dvb_frontend_ops));
priv->fe.demodulator_priv = priv;
@@ -936,6 +1081,8 @@ struct dvb_frontend *rtl2832_attach(const struct rtl2832_config *cfg,
return &priv->fe;
err:
dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
+ if (priv && priv->i2c_adapter)
+ i2c_del_mux_adapter(priv->i2c_adapter);
kfree(priv);
return NULL;
}