forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
340 lines
7.7 KiB
340 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* MaxLinear MxL301RF OFDM tuner driver |
|
* |
|
* Copyright (C) 2014 Akihiro Tsukada <[email protected]> |
|
*/ |
|
|
|
/* |
|
* NOTICE: |
|
* This driver is incomplete and lacks init/config of the chips, |
|
* as the necessary info is not disclosed. |
|
* Other features like get_if_frequency() are missing as well. |
|
* It assumes that users of this driver (such as a PCI bridge of |
|
* DTV receiver cards) properly init and configure the chip |
|
* via I2C *before* calling this driver's init() function. |
|
* |
|
* Currently, PT3 driver is the only one that uses this driver, |
|
* and contains init/config code in its firmware. |
|
* Thus some part of the code might be dependent on PT3 specific config. |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include "mxl301rf.h" |
|
|
|
struct mxl301rf_state { |
|
struct mxl301rf_config cfg; |
|
struct i2c_client *i2c; |
|
}; |
|
|
|
static struct mxl301rf_state *cfg_to_state(struct mxl301rf_config *c) |
|
{ |
|
return container_of(c, struct mxl301rf_state, cfg); |
|
} |
|
|
|
static int raw_write(struct mxl301rf_state *state, const u8 *buf, int len) |
|
{ |
|
int ret; |
|
|
|
ret = i2c_master_send(state->i2c, buf, len); |
|
if (ret >= 0 && ret < len) |
|
ret = -EIO; |
|
return (ret == len) ? 0 : ret; |
|
} |
|
|
|
static int reg_write(struct mxl301rf_state *state, u8 reg, u8 val) |
|
{ |
|
u8 buf[2] = { reg, val }; |
|
|
|
return raw_write(state, buf, 2); |
|
} |
|
|
|
static int reg_read(struct mxl301rf_state *state, u8 reg, u8 *val) |
|
{ |
|
u8 wbuf[2] = { 0xfb, reg }; |
|
int ret; |
|
|
|
ret = raw_write(state, wbuf, sizeof(wbuf)); |
|
if (ret == 0) |
|
ret = i2c_master_recv(state->i2c, val, 1); |
|
if (ret >= 0 && ret < 1) |
|
ret = -EIO; |
|
return (ret == 1) ? 0 : ret; |
|
} |
|
|
|
/* tuner_ops */ |
|
|
|
/* get RSSI and update propery cache, set to *out in % */ |
|
static int mxl301rf_get_rf_strength(struct dvb_frontend *fe, u16 *out) |
|
{ |
|
struct mxl301rf_state *state; |
|
int ret; |
|
u8 rf_in1, rf_in2, rf_off1, rf_off2; |
|
u16 rf_in, rf_off; |
|
s64 level; |
|
struct dtv_fe_stats *rssi; |
|
|
|
rssi = &fe->dtv_property_cache.strength; |
|
rssi->len = 1; |
|
rssi->stat[0].scale = FE_SCALE_NOT_AVAILABLE; |
|
*out = 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_off1 >> 3); |
|
level = rf_in - rf_off - (113 << 3); /* x8 dBm */ |
|
level = level * 1000 / 8; |
|
rssi->stat[0].svalue = level; |
|
rssi->stat[0].scale = FE_SCALE_DECIBEL; |
|
/* *out = (level - min) * 100 / (max - min) */ |
|
*out = (rf_in - rf_off + (1 << 9) - 1) * 100 / ((5 << 9) - 2); |
|
return 0; |
|
} |
|
|
|
/* spur shift parameters */ |
|
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 } |
|
}; |
|
|
|
struct reg_val { |
|
u8 reg; |
|
u8 val; |
|
} __attribute__ ((__packed__)); |
|
|
|
static const struct reg_val set_idac[] = { |
|
{ 0x0d, 0x00 }, |
|
{ 0x0c, 0x67 }, |
|
{ 0x6f, 0x89 }, |
|
{ 0x70, 0x0c }, |
|
{ 0x6f, 0x8a }, |
|
{ 0x70, 0x0e }, |
|
{ 0x6f, 0x8b }, |
|
{ 0x70, 0x1c }, |
|
}; |
|
|
|
static int mxl301rf_set_params(struct dvb_frontend *fe) |
|
{ |
|
struct reg_val tune0[] = { |
|
{ 0x13, 0x00 }, /* abort tuning */ |
|
{ 0x3b, 0xc0 }, |
|
{ 0x3b, 0x80 }, |
|
{ 0x10, 0x95 }, /* BW */ |
|
{ 0x1a, 0x05 }, |
|
{ 0x61, 0x00 }, /* spur shift value (placeholder) */ |
|
{ 0x62, 0xa0 } /* spur shift direction (placeholder) */ |
|
}; |
|
|
|
struct reg_val tune1[] = { |
|
{ 0x11, 0x40 }, /* RF frequency L (placeholder) */ |
|
{ 0x12, 0x0e }, /* RF frequency H (placeholder) */ |
|
{ 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; |
|
|
|
/* 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[5].val = shf_tab[i].shf_val; |
|
tune0[6].val = 0xa0 | shf_tab[i].shf_dir; |
|
break; |
|
} |
|
} |
|
ret = raw_write(state, (u8 *) 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[0].val = f & 0xff; |
|
tune1[1].val = f >> 8; |
|
ret = raw_write(state, (u8 *) tune1, sizeof(tune1)); |
|
if (ret < 0) |
|
goto failed; |
|
msleep(31); |
|
|
|
ret = reg_write(state, 0x1a, 0x0d); |
|
if (ret < 0) |
|
goto failed; |
|
ret = raw_write(state, (u8 *) 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 const struct reg_val standby_data[] = { |
|
{ 0x01, 0x00 }, |
|
{ 0x13, 0x00 } |
|
}; |
|
|
|
static int mxl301rf_sleep(struct dvb_frontend *fe) |
|
{ |
|
struct mxl301rf_state *state; |
|
int ret; |
|
|
|
state = fe->tuner_priv; |
|
ret = raw_write(state, (u8 *)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; |
|
} |
|
|
|
|
|
/* 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) |
|
{ |
|
struct mxl301rf_state *state; |
|
int ret; |
|
|
|
state = fe->tuner_priv; |
|
|
|
ret = reg_write(state, 0x01, 0x01); |
|
if (ret < 0) { |
|
dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n", |
|
__func__, fe->dvb->num, fe->id); |
|
return ret; |
|
} |
|
return 0; |
|
} |
|
|
|
/* I2C driver functions */ |
|
|
|
static const struct dvb_tuner_ops mxl301rf_ops = { |
|
.info = { |
|
.name = "MaxLinear MxL301RF", |
|
|
|
.frequency_min_hz = 93 * MHz, |
|
.frequency_max_hz = 803 * MHz + 142857, |
|
}, |
|
|
|
.init = mxl301rf_init, |
|
.sleep = mxl301rf_sleep, |
|
|
|
.set_params = mxl301rf_set_params, |
|
.get_rf_strength = mxl301rf_get_rf_strength, |
|
}; |
|
|
|
|
|
static int mxl301rf_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct mxl301rf_state *state; |
|
struct mxl301rf_config *cfg; |
|
struct dvb_frontend *fe; |
|
|
|
state = kzalloc(sizeof(*state), GFP_KERNEL); |
|
if (!state) |
|
return -ENOMEM; |
|
|
|
state->i2c = client; |
|
cfg = client->dev.platform_data; |
|
|
|
memcpy(&state->cfg, cfg, sizeof(state->cfg)); |
|
fe = cfg->fe; |
|
fe->tuner_priv = state; |
|
memcpy(&fe->ops.tuner_ops, &mxl301rf_ops, sizeof(mxl301rf_ops)); |
|
|
|
i2c_set_clientdata(client, &state->cfg); |
|
dev_info(&client->dev, "MaxLinear MxL301RF attached.\n"); |
|
return 0; |
|
} |
|
|
|
static int mxl301rf_remove(struct i2c_client *client) |
|
{ |
|
struct mxl301rf_state *state; |
|
|
|
state = cfg_to_state(i2c_get_clientdata(client)); |
|
state->cfg.fe->tuner_priv = NULL; |
|
kfree(state); |
|
return 0; |
|
} |
|
|
|
|
|
static const struct i2c_device_id mxl301rf_id[] = { |
|
{"mxl301rf", 0}, |
|
{} |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, mxl301rf_id); |
|
|
|
static struct i2c_driver mxl301rf_driver = { |
|
.driver = { |
|
.name = "mxl301rf", |
|
}, |
|
.probe = mxl301rf_probe, |
|
.remove = mxl301rf_remove, |
|
.id_table = mxl301rf_id, |
|
}; |
|
|
|
module_i2c_driver(mxl301rf_driver); |
|
|
|
MODULE_DESCRIPTION("MaxLinear MXL301RF tuner"); |
|
MODULE_AUTHOR("Akihiro TSUKADA"); |
|
MODULE_LICENSE("GPL");
|
|
|