diff options
| -rw-r--r-- | drivers/media/dvb-frontends/rtl2832.c | 92 | ||||
| -rw-r--r-- | drivers/media/dvb-frontends/rtl2832.h | 12 | ||||
| -rw-r--r-- | drivers/media/dvb-frontends/rtl2832_priv.h | 1 |
3 files changed, 102 insertions, 3 deletions
diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c index cfc54388a15e..fdbed35c87fa 100644 --- a/drivers/media/dvb-frontends/rtl2832.c +++ b/drivers/media/dvb-frontends/rtl2832.c @@ -891,16 +891,65 @@ 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]; + u8 buf[2], val; struct i2c_msg msg[1] = { { .addr = priv->cfg.i2c_addr, @@ -909,6 +958,22 @@ static int rtl2832_select(struct i2c_adapter *adap, void *mux_priv, u32 chan_id) .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; @@ -916,13 +981,17 @@ static int rtl2832_select(struct i2c_adapter *adap, void *mux_priv, u32 chan_id) /* 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) @@ -939,9 +1008,18 @@ static int rtl2832_select(struct i2c_adapter *adap, void *mux_priv, u32 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; @@ -949,6 +1027,13 @@ struct i2c_adapter *rtl2832_get_i2c_adapter(struct dvb_frontend *fe) } 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) { @@ -967,6 +1052,7 @@ 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, @@ -981,7 +1067,7 @@ struct dvb_frontend *rtl2832_attach(const struct rtl2832_config *cfg, /* 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, NULL); + 0, 1, 0, rtl2832_select, rtl2832_deselect); if (priv->i2c_adapter_tuner == NULL) goto err; diff --git a/drivers/media/dvb-frontends/rtl2832.h b/drivers/media/dvb-frontends/rtl2832.h index a9202d72a8aa..cb3b6b0775b8 100644 --- a/drivers/media/dvb-frontends/rtl2832.h +++ b/drivers/media/dvb-frontends/rtl2832.h @@ -60,6 +60,10 @@ extern struct i2c_adapter *rtl2832_get_i2c_adapter( struct dvb_frontend *fe ); +extern struct i2c_adapter *rtl2832_get_private_i2c_adapter( + struct dvb_frontend *fe +); + #else static inline struct dvb_frontend *rtl2832_attach( @@ -77,6 +81,14 @@ static inline struct i2c_adapter *rtl2832_get_i2c_adapter( { return NULL; } + +static inline struct i2c_adapter *rtl2832_get_private_i2c_adapter( + struct dvb_frontend *fe +) +{ + return NULL; +} + #endif diff --git a/drivers/media/dvb-frontends/rtl2832_priv.h b/drivers/media/dvb-frontends/rtl2832_priv.h index 8b7c1ae9e0f6..ae469f032fe6 100644 --- a/drivers/media/dvb-frontends/rtl2832_priv.h +++ b/drivers/media/dvb-frontends/rtl2832_priv.h @@ -37,6 +37,7 @@ struct rtl2832_priv { u8 tuner; u8 page; /* active register page */ + struct delayed_work i2c_gate_work; }; struct rtl2832_reg_entry { |