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author | Konstantin Dimitrov <kosio.dimitrov@gmail.com> | 2012-12-23 19:25:27 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-12-27 19:26:58 -0200 |
commit | 6fef4fc71e79282b673d7613cfc63da6bdeec5bd (patch) | |
tree | 99a3a5593b9c42ce2590c67578fbb86344929128 /drivers/media/dvb-frontends/ts2020.c | |
parent | c1965eae65f0db2eee574f72aab4e8b34ecf8f9c (diff) | |
download | op-kernel-dev-6fef4fc71e79282b673d7613cfc63da6bdeec5bd.zip op-kernel-dev-6fef4fc71e79282b673d7613cfc63da6bdeec5bd.tar.gz |
[media] ts2020: add ts2020 tuner driver
add separate ts2020 tuner driver
Signed-off-by: Konstantin Dimitrov <kosio.dimitrov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb-frontends/ts2020.c')
-rw-r--r-- | drivers/media/dvb-frontends/ts2020.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/ts2020.c b/drivers/media/dvb-frontends/ts2020.c new file mode 100644 index 0000000..8dce4ae --- /dev/null +++ b/drivers/media/dvb-frontends/ts2020.c @@ -0,0 +1,323 @@ +/* + 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" + +#define TS2020_XTAL_FREQ 27000 /* in kHz */ + +struct ts2020_state { + u8 tuner_address; + struct i2c_adapter *i2c; +}; + +static int ts2020_readreg(struct dvb_frontend *fe, u8 reg) +{ + struct ts2020_state *state = fe->tuner_priv; + + int ret; + u8 b0[] = { reg }; + u8 b1[] = { 0 }; + struct i2c_msg msg[] = { + { + .addr = state->tuner_address, + .flags = 0, + .buf = b0, + .len = 1 + }, { + .addr = state->tuner_address, + .flags = I2C_M_RD, + .buf = b1, + .len = 1 + } + }; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + ret = i2c_transfer(state->i2c, msg, 2); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + if (ret != 2) { + printk(KERN_ERR "%s: reg=0x%x(error=%d)\n", __func__, reg, ret); + return ret; + } + + return b1[0]; +} + +static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data) +{ + struct ts2020_state *state = fe->tuner_priv; + + u8 buf[] = { reg, data }; + struct i2c_msg msg = { .addr = state->tuner_address, + .flags = 0, .buf = buf, .len = 2 }; + int err; + + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + err = i2c_transfer(state->i2c, &msg, 1); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + if (err != 1) { + printk(KERN_ERR "%s: writereg error(err == %i, reg == 0x%02x," + " value == 0x%02x)\n", __func__, err, reg, data); + return -EREMOTEIO; + } + + return 0; +} + +static int ts2020_init(struct dvb_frontend *fe) +{ + ts2020_writereg(fe, 0x42, 0x73); + ts2020_writereg(fe, 0x05, 0x01); + ts2020_writereg(fe, 0x62, 0xf5); + return 0; +} + +static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency) +{ + u16 ndiv, div4; + + div4 = (ts2020_readreg(fe, 0x10) & 0x10) >> 4; + + ndiv = ts2020_readreg(fe, 0x01); + ndiv &= 0x0f; + ndiv <<= 8; + ndiv |= ts2020_readreg(fe, 0x02); + + /* actual tuned frequency, i.e. including the offset */ + *frequency = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ + / (6 + 8) / (div4 + 1) / 2; + + return 0; +} + +static int ts2020_set_params(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + + u8 mlpf, mlpf_new, mlpf_max, mlpf_min, nlpf, div4; + u16 value, ndiv; + u32 srate = 0, f3db; + + ts2020_init(fe); + + /* unknown */ + ts2020_writereg(fe, 0x07, 0x02); + ts2020_writereg(fe, 0x10, 0x00); + ts2020_writereg(fe, 0x60, 0x79); + ts2020_writereg(fe, 0x08, 0x01); + ts2020_writereg(fe, 0x00, 0x01); + div4 = 0; + + /* calculate and set freq divider */ + if (c->frequency < 1146000) { + ts2020_writereg(fe, 0x10, 0x11); + div4 = 1; + ndiv = ((c->frequency * (6 + 8) * 4) + + (TS2020_XTAL_FREQ / 2)) / + TS2020_XTAL_FREQ - 1024; + } else { + ts2020_writereg(fe, 0x10, 0x01); + ndiv = ((c->frequency * (6 + 8) * 2) + + (TS2020_XTAL_FREQ / 2)) / + TS2020_XTAL_FREQ - 1024; + } + + ts2020_writereg(fe, 0x01, (ndiv & 0x0f00) >> 8); + ts2020_writereg(fe, 0x02, ndiv & 0x00ff); + + /* set pll */ + ts2020_writereg(fe, 0x03, 0x06); + ts2020_writereg(fe, 0x51, 0x0f); + ts2020_writereg(fe, 0x51, 0x1f); + ts2020_writereg(fe, 0x50, 0x10); + ts2020_writereg(fe, 0x50, 0x00); + msleep(5); + + /* unknown */ + ts2020_writereg(fe, 0x51, 0x17); + ts2020_writereg(fe, 0x51, 0x1f); + ts2020_writereg(fe, 0x50, 0x08); + ts2020_writereg(fe, 0x50, 0x00); + msleep(5); + + value = ts2020_readreg(fe, 0x3d); + value &= 0x0f; + if ((value > 4) && (value < 15)) { + value -= 3; + if (value < 4) + value = 4; + value = ((value << 3) | 0x01) & 0x79; + } + + ts2020_writereg(fe, 0x60, value); + ts2020_writereg(fe, 0x51, 0x17); + ts2020_writereg(fe, 0x51, 0x1f); + ts2020_writereg(fe, 0x50, 0x08); + ts2020_writereg(fe, 0x50, 0x00); + + /* set low-pass filter period */ + ts2020_writereg(fe, 0x04, 0x2e); + ts2020_writereg(fe, 0x51, 0x1b); + ts2020_writereg(fe, 0x51, 0x1f); + ts2020_writereg(fe, 0x50, 0x04); + ts2020_writereg(fe, 0x50, 0x00); + msleep(5); + + srate = c->symbol_rate / 1000; + + f3db = (srate << 2) / 5 + 2000; + if (srate < 5000) + f3db += 3000; + if (f3db < 7000) + f3db = 7000; + if (f3db > 40000) + f3db = 40000; + + /* set low-pass filter baseband */ + value = ts2020_readreg(fe, 0x26); + mlpf = 0x2e * 207 / ((value << 1) + 151); + mlpf_max = mlpf * 135 / 100; + mlpf_min = mlpf * 78 / 100; + if (mlpf_max > 63) + mlpf_max = 63; + + /* rounded to the closest integer */ + nlpf = ((mlpf * f3db * 1000) + (2766 * TS2020_XTAL_FREQ / 2)) + / (2766 * TS2020_XTAL_FREQ); + if (nlpf > 23) + nlpf = 23; + if (nlpf < 1) + nlpf = 1; + + /* rounded to the closest integer */ + mlpf_new = ((TS2020_XTAL_FREQ * nlpf * 2766) + + (1000 * f3db / 2)) / (1000 * f3db); + + if (mlpf_new < mlpf_min) { + nlpf++; + mlpf_new = ((TS2020_XTAL_FREQ * nlpf * 2766) + + (1000 * f3db / 2)) / (1000 * f3db); + } + + if (mlpf_new > mlpf_max) + mlpf_new = mlpf_max; + + ts2020_writereg(fe, 0x04, mlpf_new); + ts2020_writereg(fe, 0x06, nlpf); + ts2020_writereg(fe, 0x51, 0x1b); + ts2020_writereg(fe, 0x51, 0x1f); + ts2020_writereg(fe, 0x50, 0x04); + ts2020_writereg(fe, 0x50, 0x00); + msleep(5); + + /* unknown */ + ts2020_writereg(fe, 0x51, 0x1e); + ts2020_writereg(fe, 0x51, 0x1f); + ts2020_writereg(fe, 0x50, 0x01); + ts2020_writereg(fe, 0x50, 0x00); + msleep(60); + + return 0; +} + +static int ts2020_release(struct dvb_frontend *fe) +{ + struct ts2020_state *state = fe->tuner_priv; + + fe->tuner_priv = NULL; + kfree(state); + + return 0; +} + +int ts2020_get_signal_strength(struct dvb_frontend *fe, + u16 *signal_strength) +{ + u16 sig_reading, sig_strength; + u8 rfgain, bbgain; + + rfgain = ts2020_readreg(fe, 0x3d) & 0x1f; + bbgain = ts2020_readreg(fe, 0x21) & 0x1f; + + if (rfgain > 15) + rfgain = 15; + if (bbgain > 13) + bbgain = 13; + + sig_reading = rfgain * 2 + bbgain * 3; + + sig_strength = 40 + (64 - sig_reading) * 50 / 64 ; + + /* cook the value to be suitable for szap-s2 human readable output */ + *signal_strength = sig_strength * 1000; + + return 0; +} + +static struct dvb_tuner_ops ts2020_ops = { + .info = { + .name = "Montage Technology TS2020 Silicon Tuner", + .frequency_min = 950000, + .frequency_max = 2150000, + }, + + .init = ts2020_init, + .release = ts2020_release, + .set_params = ts2020_set_params, + .get_frequency = ts2020_get_frequency, + .get_rf_strength = ts2020_get_signal_strength +}; + +struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe, + const struct ts2020_config *config, struct i2c_adapter *i2c) +{ + struct ts2020_state *state = NULL; + + /* allocate memory for the internal state */ + state = kzalloc(sizeof(struct ts2020_state), GFP_KERNEL); + if (!state) + return NULL; + + /* setup the state */ + state->tuner_address = config->tuner_address; + state->i2c = i2c; + fe->tuner_priv = state; + fe->ops.tuner_ops = ts2020_ops; + fe->ops.read_signal_strength = fe->ops.tuner_ops.get_rf_strength; + + return fe; +} +EXPORT_SYMBOL(ts2020_attach); + +MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>"); +MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module"); +MODULE_LICENSE("GPL"); |