Em Tue, 15 Jul 2014 00:43:44 +0900
tskd08@xxxxxxxxx escreveu:
> From: Akihiro Tsukada <tskd08@xxxxxxxxx>
>
> This patch adds driver for mxl301rf OFDM tuner chips.
> It is used as an ISDB-T tuner in earthsoft pt3 cards.
>
> Note that this driver does not initilize the chip,
> because the initilization sequence / register setting is not disclosed.
> Thus, the driver assumes that the chips are initilized externally
> by its parent board driver before tuner_ops->init() are called.
> Earthsoft PT3 PCIe card, for example, contains the init sequence
> in its private memory and provides a command to trigger the sequence.
>
> Signed-off-by: Akihiro Tsukada <tskd08@xxxxxxxxx>
> ---
> drivers/media/tuners/Kconfig | 7 +
> drivers/media/tuners/Makefile | 1 +
> drivers/media/tuners/mxl301rf.c | 331 ++++++++++++++++++++++++++++++++++++++++
> drivers/media/tuners/mxl301rf.h | 40 +++++
> 4 files changed, 379 insertions(+)
> create mode 100644 drivers/media/tuners/mxl301rf.c
> create mode 100644 drivers/media/tuners/mxl301rf.h
>
> diff --git a/drivers/media/tuners/Kconfig b/drivers/media/tuners/Kconfig
> index 22b6b8b..939111d 100644
> --- a/drivers/media/tuners/Kconfig
> +++ b/drivers/media/tuners/Kconfig
> @@ -250,4 +250,11 @@ config MEDIA_TUNER_R820T
> default m if !MEDIA_SUBDRV_AUTOSELECT
> help
> Rafael Micro R820T silicon tuner driver.
> +
> +config MEDIA_TUNER_MXL301RF
> + tristate "MaxLinear MxL301RF tuner"
> + depends on MEDIA_SUPPORT && I2C
> + default m if !MEDIA_SUBDRV_AUTOSELECT
> + help
> + MaxLinear MxL301RF OFDM tuner driver.
> endmenu
> diff --git a/drivers/media/tuners/Makefile b/drivers/media/tuners/Makefile
> index a6ff0c6..026eb16 100644
> --- a/drivers/media/tuners/Makefile
> +++ b/drivers/media/tuners/Makefile
> @@ -38,6 +38,7 @@ obj-$(CONFIG_MEDIA_TUNER_FC0012) += fc0012.o
> obj-$(CONFIG_MEDIA_TUNER_FC0013) += fc0013.o
> obj-$(CONFIG_MEDIA_TUNER_IT913X) += tuner_it913x.o
> obj-$(CONFIG_MEDIA_TUNER_R820T) += r820t.o
> +obj-$(CONFIG_MEDIA_TUNER_MXL301RF) += mxl301rf.o
>
> ccflags-y += -I$(srctree)/drivers/media/dvb-core
> ccflags-y += -I$(srctree)/drivers/media/dvb-frontends
> diff --git a/drivers/media/tuners/mxl301rf.c b/drivers/media/tuners/mxl301rf.c
> new file mode 100644
> index 0000000..65e4438
> --- /dev/null
> +++ b/drivers/media/tuners/mxl301rf.c
> @@ -0,0 +1,331 @@
> +/*
> + * MaxLinear MxL301RF OFDM tuner driver
> + *
> + * Copyright (C) 2014 Akihiro Tsukada <tskd08@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include "mxl301rf.h"
> +
> +struct mxl301rf_state {
> + struct mxl301rf_config cfg;
> + struct i2c_adapter *i2c;
> +};
> +
> +static int data_write(struct mxl301rf_state *state, const u8 *buf, int len)
> +{
> + struct i2c_msg msg = {
> + .addr = state->cfg.addr,
> + .flags = 0,
> + .buf = (u8 *)buf,
> + .len = len,
> + };
> +
> + return i2c_transfer(state->i2c, &msg, 1);
> +}
> +
> +static int reg_write(struct mxl301rf_state *state, u8 reg, u8 val)
> +{
> + u8 buf[2] = { reg, val };
> +
> + return data_write(state, buf, 2);
> +}
> +
> +static int reg_read(struct mxl301rf_state *state, u8 reg, u8 *val)
> +{
> + u8 wbuf[2] = { 0xfb, reg };
> + struct i2c_msg msgs[2] = {
> + {
> + .addr = state->cfg.addr,
> + .flags = 0,
> + .buf = wbuf,
> + .len = 2,
> + },
> + {
> + .addr = state->cfg.addr,
> + .flags = I2C_M_RD,
> + .buf = val,
> + .len = 1,
> + }
> + };
> +
> + return i2c_transfer(state->i2c, msgs, ARRAY_SIZE(msgs));
> +}
> +
> +/* tuner_ops */
> +
> +static int mxl301rf_get_status(struct dvb_frontend *fe, u32 *status)
> +{
> + struct mxl301rf_state *state;
> + int ret;
> + u8 val;
> +
> + *status = 0;
> + state = fe->tuner_priv;
> + ret = reg_read(state, 0x16, &val); /* check RF Synthesizer lock */
> + if (ret < 0 || (val & 0x0c) != 0x0c)
> + return ret;
> + ret = reg_read(state, 0x16, &val); /* check REF Synthesizer lock */
> + if (ret < 0 || (val & 0x03) != 0x03)
> + return ret;
> + *status = TUNER_STATUS_LOCKED;
> + return 0;
> +}
> +
> +/* *strength : [1/1000 dBm] */
> +static int mxl301rf_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
> +{
> + struct mxl301rf_state *state;
> + int ret;
> + u8 rf_in1, rf_in2, rf_off1, rf_off2;
> + u16 rf_in, rf_off;
> + s16 level;
> +
> + *strength = 0;
> + state = fe->tuner_priv;
> + ret = reg_write(state, 0x14, 0x01);
> + if (ret < 0)
> + return ret;
> + usleep_range(1000, 2000);
> + ret = reg_read(state, 0x18, &rf_in1);
> + if (ret == 0)
> + ret = reg_read(state, 0x19, &rf_in2);
> + if (ret == 0)
> + ret = reg_read(state, 0xd6, &rf_off1);
> + if (ret == 0)
> + ret = reg_read(state, 0xd7, &rf_off2);
> + if (ret != 0)
> + return ret;
> +
> + rf_in = (rf_in2 & 0x07) << 8 | rf_in1;
> + rf_off = (rf_off2 & 0x0f) << 5 | (rf_off2 >> 3);
> + level = rf_in - rf_off - (113 << 3); /* x8 dBm */
> + level = level * 1000 / 8;
> + *strength = (u16)level;
Please implement it using DVBv5 API, e. g. using dBm scale.
> + return 0;
> +}
> +
> +static int mxl301rf_set_params(struct dvb_frontend *fe)
> +{
> + struct shf {
> + u32 freq; /* Channel center frequency */
> + u32 ofst_th; /* Offset frequency threshold */
> + u8 shf_val; /* Spur shift value */
> + u8 shf_dir; /* Spur shift direction */
> + };
> + static const struct shf shf_tab[] = {
> + { 64500, 500, 0x92, 0x07 },
> + { 191500, 300, 0xe2, 0x07 },
> + { 205500, 500, 0x2c, 0x04 },
> + { 212500, 500, 0x1e, 0x04 },
> + { 226500, 500, 0xd4, 0x07 },
> + { 99143, 500, 0x9c, 0x07 },
> + { 173143, 500, 0xd4, 0x07 },
> + { 191143, 300, 0xd4, 0x07 },
> + { 207143, 500, 0xce, 0x07 },
> + { 225143, 500, 0xce, 0x07 },
> + { 243143, 500, 0xd4, 0x07 },
> + { 261143, 500, 0xd4, 0x07 },
> + { 291143, 500, 0xd4, 0x07 },
> + { 339143, 500, 0x2c, 0x04 },
> + { 117143, 500, 0x7a, 0x07 },
> + { 135143, 300, 0x7a, 0x07 },
> + { 153143, 500, 0x01, 0x07 }
> + };
> + static const u8 set_idac[] = {
> + 0x0d, 0x00,
> + 0x0c, 0x67,
> + 0x6f, 0x89,
> + 0x70, 0x0c,
> + 0x6f, 0x8a,
> + 0x70, 0x0e,
> + 0x6f, 0x8b,
> + 0x70, 0x1c,
> + };
> +
> + u8 tune0[] = {
> + 0x13, 0x00, /* abort tuning */
> + 0x3b, 0xc0,
> + 0x3b, 0x80,
> + 0x10, 0x95, /* BW */
> + 0x1a, 0x05,
> + 0x61, 0x00,
> + 0x62, 0xa0
> + };
> + u8 tune1[] = {
> + 0x11, 0x40, /* RF frequency L */
> + 0x12, 0x0e, /* RF frequency H */
> + 0x13, 0x01 /* start tune */
> + };
> +
> + struct mxl301rf_state *state;
> + u32 freq;
> + u16 f;
> + u32 tmp, div;
> + int i, ret;
> +
> + state = fe->tuner_priv;
> + freq = fe->dtv_property_cache.frequency;
> + /* offset 1/7MHz if not applied yet */
> + if (freq % 1000000 == 0)
> + freq += 142857;
Don't do that. Userspace should be providing the right requency
> +
> + /* spur shift function (for analog) */
> + for (i = 0; i < ARRAY_SIZE(shf_tab); i++) {
> + if (freq >= (shf_tab[i].freq - shf_tab[i].ofst_th) * 1000 &&
> + freq <= (shf_tab[i].freq + shf_tab[i].ofst_th) * 1000) {
> + tune0[2 * 5 + 1] = shf_tab[i].shf_val;
> + tune0[2 * 6 + 1] = 0xa0 | shf_tab[i].shf_dir;
> + break;
> + }
> + }
Hmm... are you using a table to match the channels? If so, don't do that.
Instead, just calculate the dividers based on the given frequency.
> + ret = data_write(state, tune0, sizeof(tune0));
> + if (ret < 0)
> + goto failed;
> + usleep_range(3000, 4000);
> +
> + /* convert freq to 10.6 fixed point float [MHz] */
> + f = freq / 1000000;
> + tmp = freq % 1000000;
> + div = 1000000;
> + for (i = 0; i < 6; i++) {
> + f <<= 1;
> + div >>= 1;
> + if (tmp > div) {
> + tmp -= div;
> + f |= 1;
> + }
> + }
> + if (tmp > 7812)
> + f++;
> + tune1[2 * 0 + 1] = f & 0xff;
> + tune1[2 * 1 + 1] = f >> 8;
> + ret = data_write(state, tune1, sizeof(tune1));
> + if (ret < 0)
> + goto failed;
> + msleep(31);
> +
> + ret = reg_write(state, 0x1a, 0x0d);
> + if (ret < 0)
> + goto failed;
> + ret = data_write(state, set_idac, sizeof(set_idac));
> + if (ret < 0)
> + goto failed;
> + return 0;
> +
> +failed:
> + dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
> + __func__, fe->dvb->num, fe->id);
> + return ret;
> +}
> +
> +static int mxl301rf_sleep(struct dvb_frontend *fe)
> +{
> + static const u8 standby_data[] = {
> + 0x01, 0x00, 0x13, 0x00
> + };
> + struct mxl301rf_state *state;
> + int ret;
> +
> + state = fe->tuner_priv;
> + ret = data_write(fe->tuner_priv, standby_data, sizeof(standby_data));
> + if (ret < 0)
> + dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
> + __func__, fe->dvb->num, fe->id);
> + return ret;
> +}
> +
> +static int mxl301rf_release(struct dvb_frontend *fe)
> +{
> + struct mxl301rf_state *state;
> +
> + state = fe->tuner_priv;
> + kfree(state);
> + fe->tuner_priv = NULL;
> + return 0;
> +}
> +
> +
> +/* init sequence is not public.
> + * the parent must have init'ed the device.
> + * just wake up here.
> + */
> +static int mxl301rf_init(struct dvb_frontend *fe)
> +{
> + static const u8 wakeup_data[] = {
> + 0x01, 0x01
> + };
> + struct mxl301rf_state *state;
> + int ret;
> +
> + state = fe->tuner_priv;
> +
> + ret = data_write(state, wakeup_data, sizeof(wakeup_data));
> + if (ret < 0)
> + goto failed;
> +
> + /* tune to the initial freq */
> + if (state->cfg.init_freq > 0) {
> + fe->dtv_property_cache.frequency = state->cfg.init_freq;
> + ret = mxl301rf_set_params(fe);
> + if (ret < 0)
> + goto failed;
> + }
> + return 0;
> +
> +failed:
> + dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
> + __func__, fe->dvb->num, fe->id);
> + return ret;
> +}
> +
> +/* exported functions */
> +
> +static const struct dvb_tuner_ops mxl301rf_ops = {
> + .info = {
> + .name = "MaxLinear MxL301RF",
> +
> + .frequency_min = 93000000,
> + .frequency_max = 767000000,
Hmm... it doesn't support all 69 channels on ISDB-T?
Ok, Japan uses only a more restricted frequency range, but other Countries
use channels up to 803.14 MHz.
> + },
> +
> + .release = mxl301rf_release,
> + .init = mxl301rf_init,
> + .sleep = mxl301rf_sleep,
> +
> + .set_params = mxl301rf_set_params,
> + .get_status = mxl301rf_get_status,
> + .get_rf_strength = mxl301rf_get_rf_strength,
Isn't it capable of providing more stats?
> +};
> +
> +
> +struct dvb_frontend *mxl301rf_attach(struct dvb_frontend *fe,
> + struct i2c_adapter *i2c, const struct mxl301rf_config *cfg)
> +{
> + struct mxl301rf_state *state;
> +
> + state = kzalloc(sizeof(*state), GFP_KERNEL);
> + if (!state)
> + return NULL;
> +
> + memcpy(&state->cfg, cfg, sizeof(*cfg));
> + state->i2c = i2c;
> + memcpy(&fe->ops.tuner_ops, &mxl301rf_ops, sizeof(mxl301rf_ops));
> + fe->tuner_priv = state;
> + dev_info(&i2c->dev, "MaxLinear MxL301RF attached.\n");
> + return fe;
> +}
> +EXPORT_SYMBOL(mxl301rf_attach);
> +
> +MODULE_DESCRIPTION("MaxLinear MXL301RF tuner");
> +MODULE_AUTHOR("Akihiro TSUKADA");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/media/tuners/mxl301rf.h b/drivers/media/tuners/mxl301rf.h
> new file mode 100644
> index 0000000..8c47e55
> --- /dev/null
> +++ b/drivers/media/tuners/mxl301rf.h
> @@ -0,0 +1,40 @@
> +/*
> + * MaxLinear MxL301RF OFDM tuner driver
> + *
> + * Copyright (C) 2014 Akihiro Tsukada <tskd08@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef MXL301RF_H
> +#define MXL301RF_H
> +
> +#include <linux/kconfig.h>
> +#include "dvb_frontend.h"
> +
> +struct mxl301rf_config {
> + u8 addr;
> + u32 init_freq;
> +};
> +
> +#if IS_ENABLED(CONFIG_MEDIA_TUNER_MXL301RF)
> +extern struct dvb_frontend *mxl301rf_attach(struct dvb_frontend *fe,
> + struct i2c_adapter *i2c, const struct mxl301rf_config *cfg);
> +#else
> +static inline struct dvb_frontend *mxl301rf_attach(struct dvb_frontend *fe,
> + struct i2c_adapter *i2c, const struct mxl301rf_config *cfg)
> +{
> + printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
> + return NULL;
> +}
> +#endif
> +
> +#endif /* MXL301RF_H */
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