diff options
Diffstat (limited to 'drivers/media/tuners/mxl301rf.c')
| -rw-r--r-- | drivers/media/tuners/mxl301rf.c | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/drivers/media/tuners/mxl301rf.c b/drivers/media/tuners/mxl301rf.c new file mode 100644 index 0000000..1575a5d --- /dev/null +++ b/drivers/media/tuners/mxl301rf.c @@ -0,0 +1,349 @@ +/* + * MaxLinear MxL301RF OFDM tuner driver + * + * Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com> + * + * 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. + */ + +/* + * 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 = 93000000, + .frequency_max = 803142857, + }, + + .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"); |
