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- /*
- Montage Technology TS2020 - Silicon Tuner driver
- Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>
- Copyright (C) 2009-2012 TurboSight.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; either version 2 of the License, or
- (at your option) any later version.
- 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.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include "dvb_frontend.h"
- #include "ts2020.h"
- #include <linux/regmap.h>
- #include <linux/math64.h>
- #define TS2020_XTAL_FREQ 27000 /* in kHz */
- #define FREQ_OFFSET_LOW_SYM_RATE 3000
- struct ts2020_priv {
- struct i2c_client *client;
- struct mutex regmap_mutex;
- struct regmap_config regmap_config;
- struct regmap *regmap;
- struct dvb_frontend *fe;
- struct delayed_work stat_work;
- int (*get_agc_pwm)(struct dvb_frontend *fe, u8 *_agc_pwm);
- /* i2c details */
- struct i2c_adapter *i2c;
- int i2c_address;
- bool loop_through:1;
- u8 clk_out:2;
- u8 clk_out_div:5;
- bool dont_poll:1;
- u32 frequency_div; /* LO output divider switch frequency */
- u32 frequency_khz; /* actual used LO frequency */
- #define TS2020_M88TS2020 0
- #define TS2020_M88TS2022 1
- u8 tuner;
- };
- struct ts2020_reg_val {
- u8 reg;
- u8 val;
- };
- static void ts2020_stat_work(struct work_struct *work);
- static int ts2020_release(struct dvb_frontend *fe)
- {
- struct ts2020_priv *priv = fe->tuner_priv;
- struct i2c_client *client = priv->client;
- dev_dbg(&client->dev, "\n");
- i2c_unregister_device(client);
- return 0;
- }
- static int ts2020_sleep(struct dvb_frontend *fe)
- {
- struct ts2020_priv *priv = fe->tuner_priv;
- int ret;
- u8 u8tmp;
- if (priv->tuner == TS2020_M88TS2020)
- u8tmp = 0x0a; /* XXX: probably wrong */
- else
- u8tmp = 0x00;
- ret = regmap_write(priv->regmap, u8tmp, 0x00);
- if (ret < 0)
- return ret;
- /* stop statistics polling */
- if (!priv->dont_poll)
- cancel_delayed_work_sync(&priv->stat_work);
- return 0;
- }
- static int ts2020_init(struct dvb_frontend *fe)
- {
- struct dtv_frontend_properties *c = &fe->dtv_property_cache;
- struct ts2020_priv *priv = fe->tuner_priv;
- int i;
- u8 u8tmp;
- if (priv->tuner == TS2020_M88TS2020) {
- regmap_write(priv->regmap, 0x42, 0x73);
- regmap_write(priv->regmap, 0x05, priv->clk_out_div);
- regmap_write(priv->regmap, 0x20, 0x27);
- regmap_write(priv->regmap, 0x07, 0x02);
- regmap_write(priv->regmap, 0x11, 0xff);
- regmap_write(priv->regmap, 0x60, 0xf9);
- regmap_write(priv->regmap, 0x08, 0x01);
- regmap_write(priv->regmap, 0x00, 0x41);
- } else {
- static const struct ts2020_reg_val reg_vals[] = {
- {0x7d, 0x9d},
- {0x7c, 0x9a},
- {0x7a, 0x76},
- {0x3b, 0x01},
- {0x63, 0x88},
- {0x61, 0x85},
- {0x22, 0x30},
- {0x30, 0x40},
- {0x20, 0x23},
- {0x24, 0x02},
- {0x12, 0xa0},
- };
- regmap_write(priv->regmap, 0x00, 0x01);
- regmap_write(priv->regmap, 0x00, 0x03);
- switch (priv->clk_out) {
- case TS2020_CLK_OUT_DISABLED:
- u8tmp = 0x60;
- break;
- case TS2020_CLK_OUT_ENABLED:
- u8tmp = 0x70;
- regmap_write(priv->regmap, 0x05, priv->clk_out_div);
- break;
- case TS2020_CLK_OUT_ENABLED_XTALOUT:
- u8tmp = 0x6c;
- break;
- default:
- u8tmp = 0x60;
- break;
- }
- regmap_write(priv->regmap, 0x42, u8tmp);
- if (priv->loop_through)
- u8tmp = 0xec;
- else
- u8tmp = 0x6c;
- regmap_write(priv->regmap, 0x62, u8tmp);
- for (i = 0; i < ARRAY_SIZE(reg_vals); i++)
- regmap_write(priv->regmap, reg_vals[i].reg,
- reg_vals[i].val);
- }
- /* Initialise v5 stats here */
- c->strength.len = 1;
- c->strength.stat[0].scale = FE_SCALE_DECIBEL;
- c->strength.stat[0].uvalue = 0;
- /* Start statistics polling by invoking the work function */
- ts2020_stat_work(&priv->stat_work.work);
- return 0;
- }
- static int ts2020_tuner_gate_ctrl(struct dvb_frontend *fe, u8 offset)
- {
- struct ts2020_priv *priv = fe->tuner_priv;
- int ret;
- ret = regmap_write(priv->regmap, 0x51, 0x1f - offset);
- ret |= regmap_write(priv->regmap, 0x51, 0x1f);
- ret |= regmap_write(priv->regmap, 0x50, offset);
- ret |= regmap_write(priv->regmap, 0x50, 0x00);
- msleep(20);
- return ret;
- }
- static int ts2020_set_tuner_rf(struct dvb_frontend *fe)
- {
- struct ts2020_priv *dev = fe->tuner_priv;
- int ret;
- unsigned int utmp;
- ret = regmap_read(dev->regmap, 0x3d, &utmp);
- utmp &= 0x7f;
- if (utmp < 0x16)
- utmp = 0xa1;
- else if (utmp == 0x16)
- utmp = 0x99;
- else
- utmp = 0xf9;
- regmap_write(dev->regmap, 0x60, utmp);
- ret = ts2020_tuner_gate_ctrl(fe, 0x08);
- return ret;
- }
- static int ts2020_set_params(struct dvb_frontend *fe)
- {
- struct dtv_frontend_properties *c = &fe->dtv_property_cache;
- struct ts2020_priv *priv = fe->tuner_priv;
- int ret;
- unsigned int utmp;
- u32 f3db, gdiv28;
- u16 u16tmp, value, lpf_coeff;
- u8 buf[3], reg10, lpf_mxdiv, mlpf_max, mlpf_min, nlpf;
- unsigned int f_ref_khz, f_vco_khz, div_ref, div_out, pll_n;
- unsigned int frequency_khz = c->frequency;
- /*
- * Integer-N PLL synthesizer
- * kHz is used for all calculations to keep calculations within 32-bit
- */
- f_ref_khz = TS2020_XTAL_FREQ;
- div_ref = DIV_ROUND_CLOSEST(f_ref_khz, 2000);
- /* select LO output divider */
- if (frequency_khz < priv->frequency_div) {
- div_out = 4;
- reg10 = 0x10;
- } else {
- div_out = 2;
- reg10 = 0x00;
- }
- f_vco_khz = frequency_khz * div_out;
- pll_n = f_vco_khz * div_ref / f_ref_khz;
- pll_n += pll_n % 2;
- priv->frequency_khz = pll_n * f_ref_khz / div_ref / div_out;
- pr_debug("frequency=%u offset=%d f_vco_khz=%u pll_n=%u div_ref=%u div_out=%u\n",
- priv->frequency_khz, priv->frequency_khz - c->frequency,
- f_vco_khz, pll_n, div_ref, div_out);
- if (priv->tuner == TS2020_M88TS2020) {
- lpf_coeff = 2766;
- reg10 |= 0x01;
- ret = regmap_write(priv->regmap, 0x10, reg10);
- } else {
- lpf_coeff = 3200;
- reg10 |= 0x0b;
- ret = regmap_write(priv->regmap, 0x10, reg10);
- ret |= regmap_write(priv->regmap, 0x11, 0x40);
- }
- u16tmp = pll_n - 1024;
- buf[0] = (u16tmp >> 8) & 0xff;
- buf[1] = (u16tmp >> 0) & 0xff;
- buf[2] = div_ref - 8;
- ret |= regmap_write(priv->regmap, 0x01, buf[0]);
- ret |= regmap_write(priv->regmap, 0x02, buf[1]);
- ret |= regmap_write(priv->regmap, 0x03, buf[2]);
- ret |= ts2020_tuner_gate_ctrl(fe, 0x10);
- if (ret < 0)
- return -ENODEV;
- ret |= ts2020_tuner_gate_ctrl(fe, 0x08);
- /* Tuner RF */
- if (priv->tuner == TS2020_M88TS2020)
- ret |= ts2020_set_tuner_rf(fe);
- gdiv28 = (TS2020_XTAL_FREQ / 1000 * 1694 + 500) / 1000;
- ret |= regmap_write(priv->regmap, 0x04, gdiv28 & 0xff);
- ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
- if (ret < 0)
- return -ENODEV;
- if (priv->tuner == TS2020_M88TS2022) {
- ret = regmap_write(priv->regmap, 0x25, 0x00);
- ret |= regmap_write(priv->regmap, 0x27, 0x70);
- ret |= regmap_write(priv->regmap, 0x41, 0x09);
- ret |= regmap_write(priv->regmap, 0x08, 0x0b);
- if (ret < 0)
- return -ENODEV;
- }
- regmap_read(priv->regmap, 0x26, &utmp);
- value = utmp;
- f3db = (c->bandwidth_hz / 1000 / 2) + 2000;
- f3db += FREQ_OFFSET_LOW_SYM_RATE; /* FIXME: ~always too wide filter */
- f3db = clamp(f3db, 7000U, 40000U);
- gdiv28 = gdiv28 * 207 / (value * 2 + 151);
- mlpf_max = gdiv28 * 135 / 100;
- mlpf_min = gdiv28 * 78 / 100;
- if (mlpf_max > 63)
- mlpf_max = 63;
- nlpf = (f3db * gdiv28 * 2 / lpf_coeff /
- (TS2020_XTAL_FREQ / 1000) + 1) / 2;
- if (nlpf > 23)
- nlpf = 23;
- if (nlpf < 1)
- nlpf = 1;
- lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
- * lpf_coeff * 2 / f3db + 1) / 2;
- if (lpf_mxdiv < mlpf_min) {
- nlpf++;
- lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
- * lpf_coeff * 2 / f3db + 1) / 2;
- }
- if (lpf_mxdiv > mlpf_max)
- lpf_mxdiv = mlpf_max;
- ret = regmap_write(priv->regmap, 0x04, lpf_mxdiv);
- ret |= regmap_write(priv->regmap, 0x06, nlpf);
- ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
- ret |= ts2020_tuner_gate_ctrl(fe, 0x01);
- msleep(80);
- return (ret < 0) ? -EINVAL : 0;
- }
- static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency)
- {
- struct ts2020_priv *priv = fe->tuner_priv;
- *frequency = priv->frequency_khz;
- return 0;
- }
- static int ts2020_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
- {
- *frequency = 0; /* Zero-IF */
- return 0;
- }
- /*
- * Get the tuner gain.
- * @fe: The front end for which we're determining the gain
- * @v_agc: The voltage of the AGC from the demodulator (0-2600mV)
- * @_gain: Where to store the gain (in 0.001dB units)
- *
- * Returns 0 or a negative error code.
- */
- static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc,
- __s64 *_gain)
- {
- struct ts2020_priv *priv = fe->tuner_priv;
- unsigned long gain1, gain2, gain3;
- unsigned utmp;
- int ret;
- /* Read the RF gain */
- ret = regmap_read(priv->regmap, 0x3d, &utmp);
- if (ret < 0)
- return ret;
- gain1 = utmp & 0x1f;
- /* Read the baseband gain */
- ret = regmap_read(priv->regmap, 0x21, &utmp);
- if (ret < 0)
- return ret;
- gain2 = utmp & 0x1f;
- switch (priv->tuner) {
- case TS2020_M88TS2020:
- gain1 = clamp_t(long, gain1, 0, 15);
- gain2 = clamp_t(long, gain2, 0, 13);
- v_agc = clamp_t(long, v_agc, 400, 1100);
- *_gain = -((__s64)gain1 * 2330 +
- gain2 * 3500 +
- v_agc * 24 / 10 * 10 +
- 10000);
- /* gain in range -19600 to -116850 in units of 0.001dB */
- break;
- case TS2020_M88TS2022:
- ret = regmap_read(priv->regmap, 0x66, &utmp);
- if (ret < 0)
- return ret;
- gain3 = (utmp >> 3) & 0x07;
- gain1 = clamp_t(long, gain1, 0, 15);
- gain2 = clamp_t(long, gain2, 2, 16);
- gain3 = clamp_t(long, gain3, 0, 6);
- v_agc = clamp_t(long, v_agc, 600, 1600);
- *_gain = -((__s64)gain1 * 2650 +
- gain2 * 3380 +
- gain3 * 2850 +
- v_agc * 176 / 100 * 10 -
- 30000);
- /* gain in range -47320 to -158950 in units of 0.001dB */
- break;
- }
- return 0;
- }
- /*
- * Get the AGC information from the demodulator and use that to calculate the
- * tuner gain.
- */
- static int ts2020_get_tuner_gain(struct dvb_frontend *fe, __s64 *_gain)
- {
- struct ts2020_priv *priv = fe->tuner_priv;
- int v_agc = 0, ret;
- u8 agc_pwm;
- /* Read the AGC PWM rate from the demodulator */
- if (priv->get_agc_pwm) {
- ret = priv->get_agc_pwm(fe, &agc_pwm);
- if (ret < 0)
- return ret;
- switch (priv->tuner) {
- case TS2020_M88TS2020:
- v_agc = (int)agc_pwm * 20 - 1166;
- break;
- case TS2020_M88TS2022:
- v_agc = (int)agc_pwm * 16 - 670;
- break;
- }
- if (v_agc < 0)
- v_agc = 0;
- }
- return ts2020_read_tuner_gain(fe, v_agc, _gain);
- }
- /*
- * Gather statistics on a regular basis
- */
- static void ts2020_stat_work(struct work_struct *work)
- {
- struct ts2020_priv *priv = container_of(work, struct ts2020_priv,
- stat_work.work);
- struct i2c_client *client = priv->client;
- struct dtv_frontend_properties *c = &priv->fe->dtv_property_cache;
- int ret;
- dev_dbg(&client->dev, "\n");
- ret = ts2020_get_tuner_gain(priv->fe, &c->strength.stat[0].svalue);
- if (ret < 0)
- goto err;
- c->strength.stat[0].scale = FE_SCALE_DECIBEL;
- if (!priv->dont_poll)
- schedule_delayed_work(&priv->stat_work, msecs_to_jiffies(2000));
- return;
- err:
- dev_dbg(&client->dev, "failed=%d\n", ret);
- }
- /*
- * Read TS2020 signal strength in v3 format.
- */
- static int ts2020_read_signal_strength(struct dvb_frontend *fe,
- u16 *_signal_strength)
- {
- struct dtv_frontend_properties *c = &fe->dtv_property_cache;
- struct ts2020_priv *priv = fe->tuner_priv;
- unsigned strength;
- __s64 gain;
- if (priv->dont_poll)
- ts2020_stat_work(&priv->stat_work.work);
- if (c->strength.stat[0].scale == FE_SCALE_NOT_AVAILABLE) {
- *_signal_strength = 0;
- return 0;
- }
- gain = c->strength.stat[0].svalue;
- /* Calculate the signal strength based on the total gain of the tuner */
- if (gain < -85000)
- /* 0%: no signal or weak signal */
- strength = 0;
- else if (gain < -65000)
- /* 0% - 60%: weak signal */
- strength = 0 + div64_s64((85000 + gain) * 3, 1000);
- else if (gain < -45000)
- /* 60% - 90%: normal signal */
- strength = 60 + div64_s64((65000 + gain) * 3, 2000);
- else
- /* 90% - 99%: strong signal */
- strength = 90 + div64_s64((45000 + gain), 5000);
- *_signal_strength = strength * 65535 / 100;
- return 0;
- }
- static struct dvb_tuner_ops ts2020_tuner_ops = {
- .info = {
- .name = "TS2020",
- .frequency_min = 950000,
- .frequency_max = 2150000
- },
- .init = ts2020_init,
- .release = ts2020_release,
- .sleep = ts2020_sleep,
- .set_params = ts2020_set_params,
- .get_frequency = ts2020_get_frequency,
- .get_if_frequency = ts2020_get_if_frequency,
- .get_rf_strength = ts2020_read_signal_strength,
- };
- struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe,
- const struct ts2020_config *config,
- struct i2c_adapter *i2c)
- {
- struct i2c_client *client;
- struct i2c_board_info board_info;
- /* This is only used by ts2020_probe() so can be on the stack */
- struct ts2020_config pdata;
- memcpy(&pdata, config, sizeof(pdata));
- pdata.fe = fe;
- pdata.attach_in_use = true;
- memset(&board_info, 0, sizeof(board_info));
- strlcpy(board_info.type, "ts2020", I2C_NAME_SIZE);
- board_info.addr = config->tuner_address;
- board_info.platform_data = &pdata;
- client = i2c_new_device(i2c, &board_info);
- if (!client || !client->dev.driver)
- return NULL;
- return fe;
- }
- EXPORT_SYMBOL(ts2020_attach);
- /*
- * We implement own regmap locking due to legacy DVB attach which uses frontend
- * gate control callback to control I2C bus access. We can open / close gate and
- * serialize whole open / I2C-operation / close sequence at the same.
- */
- static void ts2020_regmap_lock(void *__dev)
- {
- struct ts2020_priv *dev = __dev;
- mutex_lock(&dev->regmap_mutex);
- if (dev->fe->ops.i2c_gate_ctrl)
- dev->fe->ops.i2c_gate_ctrl(dev->fe, 1);
- }
- static void ts2020_regmap_unlock(void *__dev)
- {
- struct ts2020_priv *dev = __dev;
- if (dev->fe->ops.i2c_gate_ctrl)
- dev->fe->ops.i2c_gate_ctrl(dev->fe, 0);
- mutex_unlock(&dev->regmap_mutex);
- }
- static int ts2020_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
- {
- struct ts2020_config *pdata = client->dev.platform_data;
- struct dvb_frontend *fe = pdata->fe;
- struct ts2020_priv *dev;
- int ret;
- u8 u8tmp;
- unsigned int utmp;
- char *chip_str;
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev) {
- ret = -ENOMEM;
- goto err;
- }
- /* create regmap */
- mutex_init(&dev->regmap_mutex);
- dev->regmap_config.reg_bits = 8,
- dev->regmap_config.val_bits = 8,
- dev->regmap_config.lock = ts2020_regmap_lock,
- dev->regmap_config.unlock = ts2020_regmap_unlock,
- dev->regmap_config.lock_arg = dev,
- dev->regmap = regmap_init_i2c(client, &dev->regmap_config);
- if (IS_ERR(dev->regmap)) {
- ret = PTR_ERR(dev->regmap);
- goto err_kfree;
- }
- dev->i2c = client->adapter;
- dev->i2c_address = client->addr;
- dev->loop_through = pdata->loop_through;
- dev->clk_out = pdata->clk_out;
- dev->clk_out_div = pdata->clk_out_div;
- dev->dont_poll = pdata->dont_poll;
- dev->frequency_div = pdata->frequency_div;
- dev->fe = fe;
- dev->get_agc_pwm = pdata->get_agc_pwm;
- fe->tuner_priv = dev;
- dev->client = client;
- INIT_DELAYED_WORK(&dev->stat_work, ts2020_stat_work);
- /* check if the tuner is there */
- ret = regmap_read(dev->regmap, 0x00, &utmp);
- if (ret)
- goto err_regmap_exit;
- if ((utmp & 0x03) == 0x00) {
- ret = regmap_write(dev->regmap, 0x00, 0x01);
- if (ret)
- goto err_regmap_exit;
- usleep_range(2000, 50000);
- }
- ret = regmap_write(dev->regmap, 0x00, 0x03);
- if (ret)
- goto err_regmap_exit;
- usleep_range(2000, 50000);
- ret = regmap_read(dev->regmap, 0x00, &utmp);
- if (ret)
- goto err_regmap_exit;
- dev_dbg(&client->dev, "chip_id=%02x\n", utmp);
- switch (utmp) {
- case 0x01:
- case 0x41:
- case 0x81:
- dev->tuner = TS2020_M88TS2020;
- chip_str = "TS2020";
- if (!dev->frequency_div)
- dev->frequency_div = 1060000;
- break;
- case 0xc3:
- case 0x83:
- dev->tuner = TS2020_M88TS2022;
- chip_str = "TS2022";
- if (!dev->frequency_div)
- dev->frequency_div = 1103000;
- break;
- default:
- ret = -ENODEV;
- goto err_regmap_exit;
- }
- if (dev->tuner == TS2020_M88TS2022) {
- switch (dev->clk_out) {
- case TS2020_CLK_OUT_DISABLED:
- u8tmp = 0x60;
- break;
- case TS2020_CLK_OUT_ENABLED:
- u8tmp = 0x70;
- ret = regmap_write(dev->regmap, 0x05, dev->clk_out_div);
- if (ret)
- goto err_regmap_exit;
- break;
- case TS2020_CLK_OUT_ENABLED_XTALOUT:
- u8tmp = 0x6c;
- break;
- default:
- ret = -EINVAL;
- goto err_regmap_exit;
- }
- ret = regmap_write(dev->regmap, 0x42, u8tmp);
- if (ret)
- goto err_regmap_exit;
- if (dev->loop_through)
- u8tmp = 0xec;
- else
- u8tmp = 0x6c;
- ret = regmap_write(dev->regmap, 0x62, u8tmp);
- if (ret)
- goto err_regmap_exit;
- }
- /* sleep */
- ret = regmap_write(dev->regmap, 0x00, 0x00);
- if (ret)
- goto err_regmap_exit;
- dev_info(&client->dev,
- "Montage Technology %s successfully identified\n", chip_str);
- memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops,
- sizeof(struct dvb_tuner_ops));
- if (!pdata->attach_in_use)
- fe->ops.tuner_ops.release = NULL;
- i2c_set_clientdata(client, dev);
- return 0;
- err_regmap_exit:
- regmap_exit(dev->regmap);
- err_kfree:
- kfree(dev);
- err:
- dev_dbg(&client->dev, "failed=%d\n", ret);
- return ret;
- }
- static int ts2020_remove(struct i2c_client *client)
- {
- struct ts2020_priv *dev = i2c_get_clientdata(client);
- dev_dbg(&client->dev, "\n");
- regmap_exit(dev->regmap);
- kfree(dev);
- return 0;
- }
- static const struct i2c_device_id ts2020_id_table[] = {
- {"ts2020", 0},
- {"ts2022", 0},
- {}
- };
- MODULE_DEVICE_TABLE(i2c, ts2020_id_table);
- static struct i2c_driver ts2020_driver = {
- .driver = {
- .name = "ts2020",
- },
- .probe = ts2020_probe,
- .remove = ts2020_remove,
- .id_table = ts2020_id_table,
- };
- module_i2c_driver(ts2020_driver);
- MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
- MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
- MODULE_LICENSE("GPL");
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