From 28c08799390befbf0821ad6dcc3a38ade454cef9 Mon Sep 17 00:00:00 2001 From: Antti Palosaari Date: Sun, 7 Dec 2014 04:07:29 -0300 Subject: [PATCH] [media] rtl2830: convert driver to kernel I2C model Convert driver to kernel I2C model. Old DVB proprietary model is still left there also. Signed-off-by: Antti Palosaari Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-frontends/Kconfig | 2 +- drivers/media/dvb-frontends/rtl2830.c | 167 +++++++++++++++++++++ drivers/media/dvb-frontends/rtl2830.h | 31 ++++ drivers/media/dvb-frontends/rtl2830_priv.h | 2 + 4 files changed, 201 insertions(+), 1 deletion(-) diff --git a/drivers/media/dvb-frontends/Kconfig b/drivers/media/dvb-frontends/Kconfig index 6c75418222e2..e8827fc1ca11 100644 --- a/drivers/media/dvb-frontends/Kconfig +++ b/drivers/media/dvb-frontends/Kconfig @@ -443,7 +443,7 @@ config DVB_CXD2820R config DVB_RTL2830 tristate "Realtek RTL2830 DVB-T" - depends on DVB_CORE && I2C + depends on DVB_CORE && I2C && I2C_MUX default m if !MEDIA_SUBDRV_AUTOSELECT help Say Y when you want to support this frontend. diff --git a/drivers/media/dvb-frontends/rtl2830.c b/drivers/media/dvb-frontends/rtl2830.c index 50e8b63e5169..ec4a19c63090 100644 --- a/drivers/media/dvb-frontends/rtl2830.c +++ b/drivers/media/dvb-frontends/rtl2830.c @@ -767,6 +767,173 @@ static struct dvb_frontend_ops rtl2830_ops = { .read_signal_strength = rtl2830_read_signal_strength, }; +/* + * I2C gate/repeater logic + * We must use unlocked i2c_transfer() here because I2C lock is already taken + * by tuner driver. Gate is closed automatically after single I2C xfer. + */ +static int rtl2830_select(struct i2c_adapter *adap, void *mux_priv, u32 chan_id) +{ + struct i2c_client *client = mux_priv; + struct rtl2830_priv *priv = i2c_get_clientdata(client); + struct i2c_msg select_reg_page_msg[1] = { + { + .addr = priv->cfg.i2c_addr, + .flags = 0, + .len = 2, + .buf = "\x00\x01", + } + }; + struct i2c_msg gate_open_msg[1] = { + { + .addr = priv->cfg.i2c_addr, + .flags = 0, + .len = 2, + .buf = "\x01\x08", + } + }; + int ret; + + /* select register page */ + ret = __i2c_transfer(adap, select_reg_page_msg, 1); + if (ret != 1) { + dev_warn(&client->dev, "i2c write failed %d\n", ret); + if (ret >= 0) + ret = -EREMOTEIO; + goto err; + } + + priv->page = 1; + + /* open tuner I2C repeater for 1 xfer, closes automatically */ + ret = __i2c_transfer(adap, gate_open_msg, 1); + if (ret != 1) { + dev_warn(&client->dev, "i2c write failed %d\n", ret); + if (ret >= 0) + ret = -EREMOTEIO; + goto err; + } + + return 0; + +err: + dev_dbg(&client->dev, "%s: failed=%d\n", __func__, ret); + return ret; +} + +static struct dvb_frontend *rtl2830_get_dvb_frontend(struct i2c_client *client) +{ + struct rtl2830_priv *priv = i2c_get_clientdata(client); + + dev_dbg(&client->dev, "\n"); + + return &priv->fe; +} + +static struct i2c_adapter *rtl2830_get_i2c_adapter(struct i2c_client *client) +{ + struct rtl2830_priv *priv = i2c_get_clientdata(client); + + dev_dbg(&client->dev, "\n"); + + return priv->adapter; +} + +static int rtl2830_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct rtl2830_platform_data *pdata = client->dev.platform_data; + struct i2c_adapter *i2c = client->adapter; + struct rtl2830_priv *priv; + int ret; + u8 u8tmp; + + dev_dbg(&client->dev, "\n"); + + if (pdata == NULL) { + ret = -EINVAL; + goto err; + } + + /* allocate memory for the internal state */ + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (priv == NULL) { + ret = -ENOMEM; + goto err; + } + + /* setup the state */ + i2c_set_clientdata(client, priv); + priv->i2c = i2c; + priv->sleeping = true; + priv->cfg.i2c_addr = client->addr; + priv->cfg.xtal = pdata->clk; + priv->cfg.spec_inv = pdata->spec_inv; + priv->cfg.vtop = pdata->vtop; + priv->cfg.krf = pdata->krf; + priv->cfg.agc_targ_val = pdata->agc_targ_val; + + /* check if the demod is there */ + ret = rtl2830_rd_reg(priv, 0x000, &u8tmp); + if (ret) + goto err_kfree; + + /* create muxed i2c adapter for tuner */ + priv->adapter = i2c_add_mux_adapter(client->adapter, &client->dev, + client, 0, 0, 0, rtl2830_select, NULL); + if (priv->adapter == NULL) { + ret = -ENODEV; + goto err_kfree; + } + + /* create dvb frontend */ + memcpy(&priv->fe.ops, &rtl2830_ops, sizeof(priv->fe.ops)); + priv->fe.ops.release = NULL; + priv->fe.demodulator_priv = priv; + + /* setup callbacks */ + pdata->get_dvb_frontend = rtl2830_get_dvb_frontend; + pdata->get_i2c_adapter = rtl2830_get_i2c_adapter; + + dev_info(&client->dev, "Realtek RTL2830 successfully attached\n"); + return 0; + +err_kfree: + kfree(priv); +err: + dev_dbg(&client->dev, "failed=%d\n", ret); + return ret; +} + +static int rtl2830_remove(struct i2c_client *client) +{ + struct rtl2830_priv *priv = i2c_get_clientdata(client); + + dev_dbg(&client->dev, "\n"); + + i2c_del_mux_adapter(priv->adapter); + kfree(priv); + return 0; +} + +static const struct i2c_device_id rtl2830_id_table[] = { + {"rtl2830", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, rtl2830_id_table); + +static struct i2c_driver rtl2830_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "rtl2830", + }, + .probe = rtl2830_probe, + .remove = rtl2830_remove, + .id_table = rtl2830_id_table, +}; + +module_i2c_driver(rtl2830_driver); + MODULE_AUTHOR("Antti Palosaari "); MODULE_DESCRIPTION("Realtek RTL2830 DVB-T demodulator driver"); MODULE_LICENSE("GPL"); diff --git a/drivers/media/dvb-frontends/rtl2830.h b/drivers/media/dvb-frontends/rtl2830.h index 3313847fb0be..b925ea5147e6 100644 --- a/drivers/media/dvb-frontends/rtl2830.h +++ b/drivers/media/dvb-frontends/rtl2830.h @@ -24,6 +24,37 @@ #include #include +struct rtl2830_platform_data { + /* + * Clock frequency. + * Hz + * 4000000, 16000000, 25000000, 28800000 + */ + u32 clk; + + /* + * Spectrum inversion. + */ + bool spec_inv; + + /* + */ + u8 vtop; + + /* + */ + u8 krf; + + /* + */ + u8 agc_targ_val; + + /* + */ + struct dvb_frontend* (*get_dvb_frontend)(struct i2c_client *); + struct i2c_adapter* (*get_i2c_adapter)(struct i2c_client *); +}; + struct rtl2830_config { /* * Demodulator I2C address. diff --git a/drivers/media/dvb-frontends/rtl2830_priv.h b/drivers/media/dvb-frontends/rtl2830_priv.h index fab10ecb3c3b..1a78351fe693 100644 --- a/drivers/media/dvb-frontends/rtl2830_priv.h +++ b/drivers/media/dvb-frontends/rtl2830_priv.h @@ -24,8 +24,10 @@ #include "dvb_frontend.h" #include "dvb_math.h" #include "rtl2830.h" +#include struct rtl2830_priv { + struct i2c_adapter *adapter; struct i2c_adapter *i2c; struct dvb_frontend fe; struct rtl2830_config cfg;