forked from luck/tmp_suning_uos_patched
aff0c42a78
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, like in PT3 driver where the bridge chip contains the init sequence in its private memory and provides a command to trigger the sequence. Signed-off-by: Akihiro Tsukada <tskd08@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
350 lines
8.0 KiB
C
350 lines
8.0 KiB
C
/*
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* MaxLinear MxL301RF OFDM tuner driver
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*
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* Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/*
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* NOTICE:
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* This driver is incomplete and lacks init/config of the chips,
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* as the necessary info is not disclosed.
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* Other features like get_if_frequency() are missing as well.
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* It assumes that users of this driver (such as a PCI bridge of
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* DTV receiver cards) properly init and configure the chip
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* via I2C *before* calling this driver's init() function.
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*
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* Currently, PT3 driver is the only one that uses this driver,
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* and contains init/config code in its firmware.
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* Thus some part of the code might be dependent on PT3 specific config.
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*/
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#include <linux/kernel.h>
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#include "mxl301rf.h"
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struct mxl301rf_state {
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struct mxl301rf_config cfg;
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struct i2c_client *i2c;
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};
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static struct mxl301rf_state *cfg_to_state(struct mxl301rf_config *c)
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{
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return container_of(c, struct mxl301rf_state, cfg);
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}
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static int raw_write(struct mxl301rf_state *state, const u8 *buf, int len)
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{
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int ret;
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ret = i2c_master_send(state->i2c, buf, len);
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if (ret >= 0 && ret < len)
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ret = -EIO;
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return (ret == len) ? 0 : ret;
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}
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static int reg_write(struct mxl301rf_state *state, u8 reg, u8 val)
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{
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u8 buf[2] = { reg, val };
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return raw_write(state, buf, 2);
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}
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static int reg_read(struct mxl301rf_state *state, u8 reg, u8 *val)
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{
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u8 wbuf[2] = { 0xfb, reg };
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int ret;
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ret = raw_write(state, wbuf, sizeof(wbuf));
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if (ret == 0)
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ret = i2c_master_recv(state->i2c, val, 1);
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if (ret >= 0 && ret < 1)
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ret = -EIO;
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return (ret == 1) ? 0 : ret;
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}
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/* tuner_ops */
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/* get RSSI and update propery cache, set to *out in % */
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static int mxl301rf_get_rf_strength(struct dvb_frontend *fe, u16 *out)
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{
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struct mxl301rf_state *state;
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int ret;
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u8 rf_in1, rf_in2, rf_off1, rf_off2;
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u16 rf_in, rf_off;
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s64 level;
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struct dtv_fe_stats *rssi;
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rssi = &fe->dtv_property_cache.strength;
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rssi->len = 1;
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rssi->stat[0].scale = FE_SCALE_NOT_AVAILABLE;
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*out = 0;
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state = fe->tuner_priv;
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ret = reg_write(state, 0x14, 0x01);
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if (ret < 0)
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return ret;
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usleep_range(1000, 2000);
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ret = reg_read(state, 0x18, &rf_in1);
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if (ret == 0)
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ret = reg_read(state, 0x19, &rf_in2);
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if (ret == 0)
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ret = reg_read(state, 0xd6, &rf_off1);
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if (ret == 0)
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ret = reg_read(state, 0xd7, &rf_off2);
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if (ret != 0)
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return ret;
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rf_in = (rf_in2 & 0x07) << 8 | rf_in1;
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rf_off = (rf_off2 & 0x0f) << 5 | (rf_off1 >> 3);
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level = rf_in - rf_off - (113 << 3); /* x8 dBm */
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level = level * 1000 / 8;
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rssi->stat[0].svalue = level;
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rssi->stat[0].scale = FE_SCALE_DECIBEL;
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/* *out = (level - min) * 100 / (max - min) */
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*out = (rf_in - rf_off + (1 << 9) - 1) * 100 / ((5 << 9) - 2);
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return 0;
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}
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/* spur shift parameters */
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struct shf {
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u32 freq; /* Channel center frequency */
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u32 ofst_th; /* Offset frequency threshold */
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u8 shf_val; /* Spur shift value */
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u8 shf_dir; /* Spur shift direction */
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};
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static const struct shf shf_tab[] = {
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{ 64500, 500, 0x92, 0x07 },
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{ 191500, 300, 0xe2, 0x07 },
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{ 205500, 500, 0x2c, 0x04 },
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{ 212500, 500, 0x1e, 0x04 },
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{ 226500, 500, 0xd4, 0x07 },
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{ 99143, 500, 0x9c, 0x07 },
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{ 173143, 500, 0xd4, 0x07 },
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{ 191143, 300, 0xd4, 0x07 },
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{ 207143, 500, 0xce, 0x07 },
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{ 225143, 500, 0xce, 0x07 },
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{ 243143, 500, 0xd4, 0x07 },
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{ 261143, 500, 0xd4, 0x07 },
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{ 291143, 500, 0xd4, 0x07 },
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{ 339143, 500, 0x2c, 0x04 },
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{ 117143, 500, 0x7a, 0x07 },
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{ 135143, 300, 0x7a, 0x07 },
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{ 153143, 500, 0x01, 0x07 }
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};
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struct reg_val {
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u8 reg;
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u8 val;
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} __attribute__ ((__packed__));
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static const struct reg_val set_idac[] = {
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{ 0x0d, 0x00 },
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{ 0x0c, 0x67 },
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{ 0x6f, 0x89 },
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{ 0x70, 0x0c },
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{ 0x6f, 0x8a },
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{ 0x70, 0x0e },
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{ 0x6f, 0x8b },
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{ 0x70, 0x1c },
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};
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static int mxl301rf_set_params(struct dvb_frontend *fe)
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{
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struct reg_val tune0[] = {
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{ 0x13, 0x00 }, /* abort tuning */
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{ 0x3b, 0xc0 },
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{ 0x3b, 0x80 },
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{ 0x10, 0x95 }, /* BW */
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{ 0x1a, 0x05 },
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{ 0x61, 0x00 }, /* spur shift value (placeholder) */
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{ 0x62, 0xa0 } /* spur shift direction (placeholder) */
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};
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struct reg_val tune1[] = {
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{ 0x11, 0x40 }, /* RF frequency L (placeholder) */
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{ 0x12, 0x0e }, /* RF frequency H (placeholder) */
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{ 0x13, 0x01 } /* start tune */
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};
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struct mxl301rf_state *state;
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u32 freq;
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u16 f;
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u32 tmp, div;
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int i, ret;
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state = fe->tuner_priv;
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freq = fe->dtv_property_cache.frequency;
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/* spur shift function (for analog) */
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for (i = 0; i < ARRAY_SIZE(shf_tab); i++) {
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if (freq >= (shf_tab[i].freq - shf_tab[i].ofst_th) * 1000 &&
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freq <= (shf_tab[i].freq + shf_tab[i].ofst_th) * 1000) {
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tune0[5].val = shf_tab[i].shf_val;
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tune0[6].val = 0xa0 | shf_tab[i].shf_dir;
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break;
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}
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}
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ret = raw_write(state, (u8 *) tune0, sizeof(tune0));
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if (ret < 0)
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goto failed;
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usleep_range(3000, 4000);
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/* convert freq to 10.6 fixed point float [MHz] */
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f = freq / 1000000;
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tmp = freq % 1000000;
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div = 1000000;
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for (i = 0; i < 6; i++) {
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f <<= 1;
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div >>= 1;
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if (tmp > div) {
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tmp -= div;
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f |= 1;
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}
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}
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if (tmp > 7812)
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f++;
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tune1[0].val = f & 0xff;
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tune1[1].val = f >> 8;
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ret = raw_write(state, (u8 *) tune1, sizeof(tune1));
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if (ret < 0)
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goto failed;
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msleep(31);
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ret = reg_write(state, 0x1a, 0x0d);
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if (ret < 0)
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goto failed;
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ret = raw_write(state, (u8 *) set_idac, sizeof(set_idac));
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if (ret < 0)
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goto failed;
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return 0;
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failed:
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dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
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__func__, fe->dvb->num, fe->id);
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return ret;
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}
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static const struct reg_val standby_data[] = {
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{ 0x01, 0x00 },
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{ 0x13, 0x00 }
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};
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static int mxl301rf_sleep(struct dvb_frontend *fe)
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{
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struct mxl301rf_state *state;
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int ret;
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state = fe->tuner_priv;
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ret = raw_write(state, (u8 *)standby_data, sizeof(standby_data));
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if (ret < 0)
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dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
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__func__, fe->dvb->num, fe->id);
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return ret;
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}
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/* init sequence is not public.
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* the parent must have init'ed the device.
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* just wake up here.
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*/
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static int mxl301rf_init(struct dvb_frontend *fe)
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{
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struct mxl301rf_state *state;
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int ret;
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state = fe->tuner_priv;
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ret = reg_write(state, 0x01, 0x01);
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if (ret < 0) {
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dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
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__func__, fe->dvb->num, fe->id);
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return ret;
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}
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return 0;
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}
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/* I2C driver functions */
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static const struct dvb_tuner_ops mxl301rf_ops = {
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.info = {
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.name = "MaxLinear MxL301RF",
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.frequency_min = 93000000,
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.frequency_max = 803142857,
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},
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.init = mxl301rf_init,
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.sleep = mxl301rf_sleep,
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.set_params = mxl301rf_set_params,
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.get_rf_strength = mxl301rf_get_rf_strength,
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};
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static int mxl301rf_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct mxl301rf_state *state;
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struct mxl301rf_config *cfg;
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struct dvb_frontend *fe;
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state)
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return -ENOMEM;
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state->i2c = client;
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cfg = client->dev.platform_data;
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memcpy(&state->cfg, cfg, sizeof(state->cfg));
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fe = cfg->fe;
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fe->tuner_priv = state;
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memcpy(&fe->ops.tuner_ops, &mxl301rf_ops, sizeof(mxl301rf_ops));
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i2c_set_clientdata(client, &state->cfg);
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dev_info(&client->dev, "MaxLinear MxL301RF attached.\n");
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return 0;
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}
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static int mxl301rf_remove(struct i2c_client *client)
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{
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struct mxl301rf_state *state;
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state = cfg_to_state(i2c_get_clientdata(client));
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state->cfg.fe->tuner_priv = NULL;
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kfree(state);
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return 0;
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}
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static const struct i2c_device_id mxl301rf_id[] = {
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{"mxl301rf", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, mxl301rf_id);
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static struct i2c_driver mxl301rf_driver = {
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.driver = {
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.name = "mxl301rf",
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},
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.probe = mxl301rf_probe,
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.remove = mxl301rf_remove,
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.id_table = mxl301rf_id,
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};
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module_i2c_driver(mxl301rf_driver);
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MODULE_DESCRIPTION("MaxLinear MXL301RF tuner");
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MODULE_AUTHOR("Akihiro TSUKADA");
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MODULE_LICENSE("GPL");
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