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path: root/drivers/media/dvb-frontends/mt352.c
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Diffstat (limited to 'drivers/media/dvb-frontends/mt352.c')
-rw-r--r--drivers/media/dvb-frontends/mt352.c596
1 files changed, 596 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/mt352.c b/drivers/media/dvb-frontends/mt352.c
new file mode 100644
index 0000000000..1b2889f5cf
--- /dev/null
+++ b/drivers/media/dvb-frontends/mt352.c
@@ -0,0 +1,596 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Zarlink DVB-T MT352 demodulator
+ *
+ * Written by Holger Waechtler <holger@qanu.de>
+ * and Daniel Mack <daniel@qanu.de>
+ *
+ * AVerMedia AVerTV DVB-T 771 support by
+ * Wolfram Joost <dbox2@frokaschwei.de>
+ *
+ * Support for Samsung TDTC9251DH01C(M) tuner
+ * Copyright (C) 2004 Antonio Mancuso <antonio.mancuso@digitaltelevision.it>
+ * Amauri Celani <acelani@essegi.net>
+ *
+ * DVICO FusionHDTV DVB-T1 and DVICO FusionHDTV DVB-T Lite support by
+ * Christopher Pascoe <c.pascoe@itee.uq.edu.au>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include <media/dvb_frontend.h>
+#include "mt352_priv.h"
+#include "mt352.h"
+
+struct mt352_state {
+ struct i2c_adapter* i2c;
+ struct dvb_frontend frontend;
+
+ /* configuration settings */
+ struct mt352_config config;
+};
+
+static int debug;
+#define dprintk(args...) \
+ do { \
+ if (debug) printk(KERN_DEBUG "mt352: " args); \
+ } while (0)
+
+static int mt352_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+ u8 buf[2] = { reg, val };
+ struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
+ .buf = buf, .len = 2 };
+ int err = i2c_transfer(state->i2c, &msg, 1);
+ if (err != 1) {
+ printk("mt352_write() to reg %x failed (err = %d)!\n", reg, err);
+ return err;
+ }
+ return 0;
+}
+
+static int _mt352_write(struct dvb_frontend* fe, const u8 ibuf[], int ilen)
+{
+ int err,i;
+ for (i=0; i < ilen-1; i++)
+ if ((err = mt352_single_write(fe,ibuf[0]+i,ibuf[i+1])))
+ return err;
+
+ return 0;
+}
+
+static int mt352_read_register(struct mt352_state* state, u8 reg)
+{
+ int ret;
+ u8 b0 [] = { reg };
+ u8 b1 [] = { 0 };
+ struct i2c_msg msg [] = { { .addr = state->config.demod_address,
+ .flags = 0,
+ .buf = b0, .len = 1 },
+ { .addr = state->config.demod_address,
+ .flags = I2C_M_RD,
+ .buf = b1, .len = 1 } };
+
+ ret = i2c_transfer(state->i2c, msg, 2);
+
+ if (ret != 2) {
+ printk("%s: readreg error (reg=%d, ret==%i)\n",
+ __func__, reg, ret);
+ return ret;
+ }
+
+ return b1[0];
+}
+
+static int mt352_sleep(struct dvb_frontend* fe)
+{
+ static u8 mt352_softdown[] = { CLOCK_CTL, 0x20, 0x08 };
+
+ _mt352_write(fe, mt352_softdown, sizeof(mt352_softdown));
+ return 0;
+}
+
+static void mt352_calc_nominal_rate(struct mt352_state* state,
+ u32 bandwidth,
+ unsigned char *buf)
+{
+ u32 adc_clock = 20480; /* 20.340 MHz */
+ u32 bw,value;
+
+ switch (bandwidth) {
+ case 6000000:
+ bw = 6;
+ break;
+ case 7000000:
+ bw = 7;
+ break;
+ case 8000000:
+ default:
+ bw = 8;
+ break;
+ }
+ if (state->config.adc_clock)
+ adc_clock = state->config.adc_clock;
+
+ value = 64 * bw * (1<<16) / (7 * 8);
+ value = value * 1000 / adc_clock;
+ dprintk("%s: bw %d, adc_clock %d => 0x%x\n",
+ __func__, bw, adc_clock, value);
+ buf[0] = msb(value);
+ buf[1] = lsb(value);
+}
+
+static void mt352_calc_input_freq(struct mt352_state* state,
+ unsigned char *buf)
+{
+ int adc_clock = 20480; /* 20.480000 MHz */
+ int if2 = 36167; /* 36.166667 MHz */
+ int ife,value;
+
+ if (state->config.adc_clock)
+ adc_clock = state->config.adc_clock;
+ if (state->config.if2)
+ if2 = state->config.if2;
+
+ if (adc_clock >= if2 * 2)
+ ife = if2;
+ else {
+ ife = adc_clock - (if2 % adc_clock);
+ if (ife > adc_clock / 2)
+ ife = adc_clock - ife;
+ }
+ value = -16374 * ife / adc_clock;
+ dprintk("%s: if2 %d, ife %d, adc_clock %d => %d / 0x%x\n",
+ __func__, if2, ife, adc_clock, value, value & 0x3fff);
+ buf[0] = msb(value);
+ buf[1] = lsb(value);
+}
+
+static int mt352_set_parameters(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *op = &fe->dtv_property_cache;
+ struct mt352_state* state = fe->demodulator_priv;
+ unsigned char buf[13];
+ static unsigned char tuner_go[] = { 0x5d, 0x01 };
+ static unsigned char fsm_go[] = { 0x5e, 0x01 };
+ unsigned int tps = 0;
+
+ switch (op->code_rate_HP) {
+ case FEC_2_3:
+ tps |= (1 << 7);
+ break;
+ case FEC_3_4:
+ tps |= (2 << 7);
+ break;
+ case FEC_5_6:
+ tps |= (3 << 7);
+ break;
+ case FEC_7_8:
+ tps |= (4 << 7);
+ break;
+ case FEC_1_2:
+ case FEC_AUTO:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (op->code_rate_LP) {
+ case FEC_2_3:
+ tps |= (1 << 4);
+ break;
+ case FEC_3_4:
+ tps |= (2 << 4);
+ break;
+ case FEC_5_6:
+ tps |= (3 << 4);
+ break;
+ case FEC_7_8:
+ tps |= (4 << 4);
+ break;
+ case FEC_1_2:
+ case FEC_AUTO:
+ break;
+ case FEC_NONE:
+ if (op->hierarchy == HIERARCHY_AUTO ||
+ op->hierarchy == HIERARCHY_NONE)
+ break;
+ fallthrough;
+ default:
+ return -EINVAL;
+ }
+
+ switch (op->modulation) {
+ case QPSK:
+ break;
+ case QAM_AUTO:
+ case QAM_16:
+ tps |= (1 << 13);
+ break;
+ case QAM_64:
+ tps |= (2 << 13);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (op->transmission_mode) {
+ case TRANSMISSION_MODE_2K:
+ case TRANSMISSION_MODE_AUTO:
+ break;
+ case TRANSMISSION_MODE_8K:
+ tps |= (1 << 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (op->guard_interval) {
+ case GUARD_INTERVAL_1_32:
+ case GUARD_INTERVAL_AUTO:
+ break;
+ case GUARD_INTERVAL_1_16:
+ tps |= (1 << 2);
+ break;
+ case GUARD_INTERVAL_1_8:
+ tps |= (2 << 2);
+ break;
+ case GUARD_INTERVAL_1_4:
+ tps |= (3 << 2);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (op->hierarchy) {
+ case HIERARCHY_AUTO:
+ case HIERARCHY_NONE:
+ break;
+ case HIERARCHY_1:
+ tps |= (1 << 10);
+ break;
+ case HIERARCHY_2:
+ tps |= (2 << 10);
+ break;
+ case HIERARCHY_4:
+ tps |= (3 << 10);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+
+ buf[0] = TPS_GIVEN_1; /* TPS_GIVEN_1 and following registers */
+
+ buf[1] = msb(tps); /* TPS_GIVEN_(1|0) */
+ buf[2] = lsb(tps);
+
+ buf[3] = 0x50; // old
+// buf[3] = 0xf4; // pinnacle
+
+ mt352_calc_nominal_rate(state, op->bandwidth_hz, buf+4);
+ mt352_calc_input_freq(state, buf+6);
+
+ if (state->config.no_tuner) {
+ if (fe->ops.tuner_ops.set_params) {
+ fe->ops.tuner_ops.set_params(fe);
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+ }
+
+ _mt352_write(fe, buf, 8);
+ _mt352_write(fe, fsm_go, 2);
+ } else {
+ if (fe->ops.tuner_ops.calc_regs) {
+ fe->ops.tuner_ops.calc_regs(fe, buf+8, 5);
+ buf[8] <<= 1;
+ _mt352_write(fe, buf, sizeof(buf));
+ _mt352_write(fe, tuner_go, 2);
+ }
+ }
+
+ return 0;
+}
+
+static int mt352_get_parameters(struct dvb_frontend* fe,
+ struct dtv_frontend_properties *op)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+ u16 tps;
+ u16 div;
+ u8 trl;
+ static const u8 tps_fec_to_api[8] =
+ {
+ FEC_1_2,
+ FEC_2_3,
+ FEC_3_4,
+ FEC_5_6,
+ FEC_7_8,
+ FEC_AUTO,
+ FEC_AUTO,
+ FEC_AUTO
+ };
+
+ if ( (mt352_read_register(state,0x00) & 0xC0) != 0xC0 )
+ return -EINVAL;
+
+ /* Use TPS_RECEIVED-registers, not the TPS_CURRENT-registers because
+ * the mt352 sometimes works with the wrong parameters
+ */
+ tps = (mt352_read_register(state, TPS_RECEIVED_1) << 8) | mt352_read_register(state, TPS_RECEIVED_0);
+ div = (mt352_read_register(state, CHAN_START_1) << 8) | mt352_read_register(state, CHAN_START_0);
+ trl = mt352_read_register(state, TRL_NOMINAL_RATE_1);
+
+ op->code_rate_HP = tps_fec_to_api[(tps >> 7) & 7];
+ op->code_rate_LP = tps_fec_to_api[(tps >> 4) & 7];
+
+ switch ( (tps >> 13) & 3)
+ {
+ case 0:
+ op->modulation = QPSK;
+ break;
+ case 1:
+ op->modulation = QAM_16;
+ break;
+ case 2:
+ op->modulation = QAM_64;
+ break;
+ default:
+ op->modulation = QAM_AUTO;
+ break;
+ }
+
+ op->transmission_mode = (tps & 0x01) ? TRANSMISSION_MODE_8K : TRANSMISSION_MODE_2K;
+
+ switch ( (tps >> 2) & 3)
+ {
+ case 0:
+ op->guard_interval = GUARD_INTERVAL_1_32;
+ break;
+ case 1:
+ op->guard_interval = GUARD_INTERVAL_1_16;
+ break;
+ case 2:
+ op->guard_interval = GUARD_INTERVAL_1_8;
+ break;
+ case 3:
+ op->guard_interval = GUARD_INTERVAL_1_4;
+ break;
+ default:
+ op->guard_interval = GUARD_INTERVAL_AUTO;
+ break;
+ }
+
+ switch ( (tps >> 10) & 7)
+ {
+ case 0:
+ op->hierarchy = HIERARCHY_NONE;
+ break;
+ case 1:
+ op->hierarchy = HIERARCHY_1;
+ break;
+ case 2:
+ op->hierarchy = HIERARCHY_2;
+ break;
+ case 3:
+ op->hierarchy = HIERARCHY_4;
+ break;
+ default:
+ op->hierarchy = HIERARCHY_AUTO;
+ break;
+ }
+
+ op->frequency = (500 * (div - IF_FREQUENCYx6)) / 3 * 1000;
+
+ if (trl == 0x72)
+ op->bandwidth_hz = 8000000;
+ else if (trl == 0x64)
+ op->bandwidth_hz = 7000000;
+ else
+ op->bandwidth_hz = 6000000;
+
+
+ if (mt352_read_register(state, STATUS_2) & 0x02)
+ op->inversion = INVERSION_OFF;
+ else
+ op->inversion = INVERSION_ON;
+
+ return 0;
+}
+
+static int mt352_read_status(struct dvb_frontend *fe, enum fe_status *status)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+ int s0, s1, s3;
+
+ /* FIXME:
+ *
+ * The MT352 design manual from Zarlink states (page 46-47):
+ *
+ * Notes about the TUNER_GO register:
+ *
+ * If the Read_Tuner_Byte (bit-1) is activated, then the tuner status
+ * byte is copied from the tuner to the STATUS_3 register and
+ * completion of the read operation is indicated by bit-5 of the
+ * INTERRUPT_3 register.
+ */
+
+ if ((s0 = mt352_read_register(state, STATUS_0)) < 0)
+ return -EREMOTEIO;
+ if ((s1 = mt352_read_register(state, STATUS_1)) < 0)
+ return -EREMOTEIO;
+ if ((s3 = mt352_read_register(state, STATUS_3)) < 0)
+ return -EREMOTEIO;
+
+ *status = 0;
+ if (s0 & (1 << 4))
+ *status |= FE_HAS_CARRIER;
+ if (s0 & (1 << 1))
+ *status |= FE_HAS_VITERBI;
+ if (s0 & (1 << 5))
+ *status |= FE_HAS_LOCK;
+ if (s1 & (1 << 1))
+ *status |= FE_HAS_SYNC;
+ if (s3 & (1 << 6))
+ *status |= FE_HAS_SIGNAL;
+
+ if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
+ (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
+ *status &= ~FE_HAS_LOCK;
+
+ return 0;
+}
+
+static int mt352_read_ber(struct dvb_frontend* fe, u32* ber)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+
+ *ber = (mt352_read_register (state, RS_ERR_CNT_2) << 16) |
+ (mt352_read_register (state, RS_ERR_CNT_1) << 8) |
+ (mt352_read_register (state, RS_ERR_CNT_0));
+
+ return 0;
+}
+
+static int mt352_read_signal_strength(struct dvb_frontend* fe, u16* strength)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+
+ /* align the 12 bit AGC gain with the most significant bits */
+ u16 signal = ((mt352_read_register(state, AGC_GAIN_1) & 0x0f) << 12) |
+ (mt352_read_register(state, AGC_GAIN_0) << 4);
+
+ /* inverse of gain is signal strength */
+ *strength = ~signal;
+ return 0;
+}
+
+static int mt352_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+
+ u8 _snr = mt352_read_register (state, SNR);
+ *snr = (_snr << 8) | _snr;
+
+ return 0;
+}
+
+static int mt352_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+
+ *ucblocks = (mt352_read_register (state, RS_UBC_1) << 8) |
+ (mt352_read_register (state, RS_UBC_0));
+
+ return 0;
+}
+
+static int mt352_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
+{
+ fe_tune_settings->min_delay_ms = 800;
+ fe_tune_settings->step_size = 0;
+ fe_tune_settings->max_drift = 0;
+
+ return 0;
+}
+
+static int mt352_init(struct dvb_frontend* fe)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+
+ static u8 mt352_reset_attach [] = { RESET, 0xC0 };
+
+ dprintk("%s: hello\n",__func__);
+
+ if ((mt352_read_register(state, CLOCK_CTL) & 0x10) == 0 ||
+ (mt352_read_register(state, CONFIG) & 0x20) == 0) {
+
+ /* Do a "hard" reset */
+ _mt352_write(fe, mt352_reset_attach, sizeof(mt352_reset_attach));
+ return state->config.demod_init(fe);
+ }
+
+ return 0;
+}
+
+static void mt352_release(struct dvb_frontend* fe)
+{
+ struct mt352_state* state = fe->demodulator_priv;
+ kfree(state);
+}
+
+static const struct dvb_frontend_ops mt352_ops;
+
+struct dvb_frontend* mt352_attach(const struct mt352_config* config,
+ struct i2c_adapter* i2c)
+{
+ struct mt352_state* state = NULL;
+
+ /* allocate memory for the internal state */
+ state = kzalloc(sizeof(struct mt352_state), GFP_KERNEL);
+ if (state == NULL) goto error;
+
+ /* setup the state */
+ state->i2c = i2c;
+ memcpy(&state->config,config,sizeof(struct mt352_config));
+
+ /* check if the demod is there */
+ if (mt352_read_register(state, CHIP_ID) != ID_MT352) goto error;
+
+ /* create dvb_frontend */
+ memcpy(&state->frontend.ops, &mt352_ops, sizeof(struct dvb_frontend_ops));
+ state->frontend.demodulator_priv = state;
+ return &state->frontend;
+
+error:
+ kfree(state);
+ return NULL;
+}
+
+static const struct dvb_frontend_ops mt352_ops = {
+ .delsys = { SYS_DVBT },
+ .info = {
+ .name = "Zarlink MT352 DVB-T",
+ .frequency_min_hz = 174 * MHz,
+ .frequency_max_hz = 862 * MHz,
+ .frequency_stepsize_hz = 166667,
+ .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
+ FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
+ FE_CAN_FEC_AUTO |
+ FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
+ FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
+ FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
+ FE_CAN_MUTE_TS
+ },
+
+ .release = mt352_release,
+
+ .init = mt352_init,
+ .sleep = mt352_sleep,
+ .write = _mt352_write,
+
+ .set_frontend = mt352_set_parameters,
+ .get_frontend = mt352_get_parameters,
+ .get_tune_settings = mt352_get_tune_settings,
+
+ .read_status = mt352_read_status,
+ .read_ber = mt352_read_ber,
+ .read_signal_strength = mt352_read_signal_strength,
+ .read_snr = mt352_read_snr,
+ .read_ucblocks = mt352_read_ucblocks,
+};
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+MODULE_DESCRIPTION("Zarlink MT352 DVB-T Demodulator driver");
+MODULE_AUTHOR("Holger Waechtler, Daniel Mack, Antonio Mancuso");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL_GPL(mt352_attach);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 08:46:08 +0000