diff options
Diffstat (limited to 'drivers/media/dvb-frontends/ts2020.c')
| -rw-r--r-- | drivers/media/dvb-frontends/ts2020.c | 743 |
1 files changed, 743 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/ts2020.c b/drivers/media/dvb-frontends/ts2020.c new file mode 100644 index 000000000..3e3e40878 --- /dev/null +++ b/drivers/media/dvb-frontends/ts2020.c @@ -0,0 +1,743 @@ +/* + 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 <media/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 void 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); +} + +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 const struct dvb_tuner_ops ts2020_tuner_ops = { + .info = { + .name = "TS2020", + .frequency_min_hz = 950 * MHz, + .frequency_max_hz = 2150 * MHz + }, + .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"); + + /* stop statistics polling */ + if (!dev->dont_poll) + cancel_delayed_work_sync(&dev->stat_work); + + 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"); |