--- /dev/null
+/*
+ * mxl111sf-demod.c - driver for the MaxLinear MXL111SF DVB-T demodulator
+ *
+ * Copyright (C) 2010 Michael Krufky <mkrufky@kernellabs.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 "mxl111sf-demod.h"
+#include "mxl111sf-reg.h"
+
+/* debug */
+static int mxl111sf_demod_debug;
+module_param_named(debug, mxl111sf_demod_debug, int, 0644);
+MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
+
+#define mxl_dbg(fmt, arg...) \
+ if (mxl111sf_demod_debug) \
+ mxl_printk(KERN_DEBUG, fmt, ##arg)
+
+/* ------------------------------------------------------------------------ */
+
+struct mxl111sf_demod_state {
+ struct mxl111sf_state *mxl_state;
+
+ struct mxl111sf_demod_config *cfg;
+
+ struct dvb_frontend fe;
+};
+
+/* ------------------------------------------------------------------------ */
+
+static int mxl111sf_demod_read_reg(struct mxl111sf_demod_state *state,
+ u8 addr, u8 *data)
+{
+ return (state->cfg->read_reg) ?
+ state->cfg->read_reg(state->mxl_state, addr, data) :
+ -EINVAL;
+}
+
+static int mxl111sf_demod_write_reg(struct mxl111sf_demod_state *state,
+ u8 addr, u8 data)
+{
+ return (state->cfg->write_reg) ?
+ state->cfg->write_reg(state->mxl_state, addr, data) :
+ -EINVAL;
+}
+
+static
+int mxl111sf_demod_program_regs(struct mxl111sf_demod_state *state,
+ struct mxl111sf_reg_ctrl_info *ctrl_reg_info)
+{
+ return (state->cfg->program_regs) ?
+ state->cfg->program_regs(state->mxl_state, ctrl_reg_info) :
+ -EINVAL;
+}
+
+/* ------------------------------------------------------------------------ */
+/* TPS */
+
+static
+int mxl1x1sf_demod_get_tps_code_rate(struct mxl111sf_demod_state *state,
+ fe_code_rate_t *code_rate)
+{
+ u8 val;
+ int ret = mxl111sf_demod_read_reg(state, V6_CODE_RATE_TPS_REG, &val);
+ /* bit<2:0> - 000:1/2, 001:2/3, 010:3/4, 011:5/6, 100:7/8 */
+ if (mxl_fail(ret))
+ goto fail;
+
+ switch (val & V6_CODE_RATE_TPS_MASK) {
+ case 0:
+ *code_rate = FEC_1_2;
+ break;
+ case 1:
+ *code_rate = FEC_2_3;
+ break;
+ case 2:
+ *code_rate = FEC_3_4;
+ break;
+ case 3:
+ *code_rate = FEC_5_6;
+ break;
+ case 4:
+ *code_rate = FEC_7_8;
+ break;
+ }
+fail:
+ return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_constellation(struct mxl111sf_demod_state *state,
+ fe_modulation_t *constellation)
+{
+ u8 val;
+ int ret = mxl111sf_demod_read_reg(state, V6_MODORDER_TPS_REG, &val);
+ /* Constellation, 00 : QPSK, 01 : 16QAM, 10:64QAM */
+ if (mxl_fail(ret))
+ goto fail;
+
+ switch ((val & V6_PARAM_CONSTELLATION_MASK) >> 4) {
+ case 0:
+ *constellation = QPSK;
+ break;
+ case 1:
+ *constellation = QAM_16;
+ break;
+ case 2:
+ *constellation = QAM_64;
+ break;
+ }
+fail:
+ return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_guard_fft_mode(struct mxl111sf_demod_state *state,
+ fe_transmit_mode_t *fft_mode)
+{
+ u8 val;
+ int ret = mxl111sf_demod_read_reg(state, V6_MODE_TPS_REG, &val);
+ /* FFT Mode, 00:2K, 01:8K, 10:4K */
+ if (mxl_fail(ret))
+ goto fail;
+
+ switch ((val & V6_PARAM_FFT_MODE_MASK) >> 2) {
+ case 0:
+ *fft_mode = TRANSMISSION_MODE_2K;
+ break;
+ case 1:
+ *fft_mode = TRANSMISSION_MODE_8K;
+ break;
+ case 2:
+ *fft_mode = TRANSMISSION_MODE_4K;
+ break;
+ }
+fail:
+ return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_guard_interval(struct mxl111sf_demod_state *state,
+ fe_guard_interval_t *guard)
+{
+ u8 val;
+ int ret = mxl111sf_demod_read_reg(state, V6_CP_TPS_REG, &val);
+ /* 00:1/32, 01:1/16, 10:1/8, 11:1/4 */
+ if (mxl_fail(ret))
+ goto fail;
+
+ switch ((val & V6_PARAM_GI_MASK) >> 4) {
+ case 0:
+ *guard = GUARD_INTERVAL_1_32;
+ break;
+ case 1:
+ *guard = GUARD_INTERVAL_1_16;
+ break;
+ case 2:
+ *guard = GUARD_INTERVAL_1_8;
+ break;
+ case 3:
+ *guard = GUARD_INTERVAL_1_4;
+ break;
+ }
+fail:
+ return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_hierarchy(struct mxl111sf_demod_state *state,
+ fe_hierarchy_t *hierarchy)
+{
+ u8 val;
+ int ret = mxl111sf_demod_read_reg(state, V6_TPS_HIERACHY_REG, &val);
+ /* bit<6:4> - 000:Non hierarchy, 001:1, 010:2, 011:4 */
+ if (mxl_fail(ret))
+ goto fail;
+
+ switch ((val & V6_TPS_HIERARCHY_INFO_MASK) >> 6) {
+ case 0:
+ *hierarchy = HIERARCHY_NONE;
+ break;
+ case 1:
+ *hierarchy = HIERARCHY_1;
+ break;
+ case 2:
+ *hierarchy = HIERARCHY_2;
+ break;
+ case 3:
+ *hierarchy = HIERARCHY_4;
+ break;
+ }
+fail:
+ return ret;
+}
+
+/* ------------------------------------------------------------------------ */
+/* LOCKS */
+
+static
+int mxl1x1sf_demod_get_sync_lock_status(struct mxl111sf_demod_state *state,
+ int *sync_lock)
+{
+ u8 val = 0;
+ int ret = mxl111sf_demod_read_reg(state, V6_SYNC_LOCK_REG, &val);
+ if (mxl_fail(ret))
+ goto fail;
+ *sync_lock = (val & SYNC_LOCK_MASK) >> 4;
+fail:
+ return ret;
+}
+
+static
+int mxl1x1sf_demod_get_rs_lock_status(struct mxl111sf_demod_state *state,
+ int *rs_lock)
+{
+ u8 val = 0;
+ int ret = mxl111sf_demod_read_reg(state, V6_RS_LOCK_DET_REG, &val);
+ if (mxl_fail(ret))
+ goto fail;
+ *rs_lock = (val & RS_LOCK_DET_MASK) >> 3;
+fail:
+ return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_lock_status(struct mxl111sf_demod_state *state,
+ int *tps_lock)
+{
+ u8 val = 0;
+ int ret = mxl111sf_demod_read_reg(state, V6_TPS_LOCK_REG, &val);
+ if (mxl_fail(ret))
+ goto fail;
+ *tps_lock = (val & V6_PARAM_TPS_LOCK_MASK) >> 6;
+fail:
+ return ret;
+}
+
+static
+int mxl1x1sf_demod_get_fec_lock_status(struct mxl111sf_demod_state *state,
+ int *fec_lock)
+{
+ u8 val = 0;
+ int ret = mxl111sf_demod_read_reg(state, V6_IRQ_STATUS_REG, &val);
+ if (mxl_fail(ret))
+ goto fail;
+ *fec_lock = (val & IRQ_MASK_FEC_LOCK) >> 4;
+fail:
+ return ret;
+}
+
+#if 0
+static
+int mxl1x1sf_demod_get_cp_lock_status(struct mxl111sf_demod_state *state,
+ int *cp_lock)
+{
+ u8 val = 0;
+ int ret = mxl111sf_demod_read_reg(state, V6_CP_LOCK_DET_REG, &val);
+ if (mxl_fail(ret))
+ goto fail;
+ *cp_lock = (val & V6_CP_LOCK_DET_MASK) >> 2;
+fail:
+ return ret;
+}
+#endif
+
+static int mxl1x1sf_demod_reset_irq_status(struct mxl111sf_demod_state *state)
+{
+ return mxl111sf_demod_write_reg(state, 0x0e, 0xff);
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int mxl111sf_demod_set_frontend(struct dvb_frontend *fe,
+ struct dvb_frontend_parameters *param)
+{
+ struct mxl111sf_demod_state *state = fe->demodulator_priv;
+ int ret = 0;
+
+ struct mxl111sf_reg_ctrl_info phy_pll_patch[] = {
+ {0x00, 0xff, 0x01}, /* change page to 1 */
+ {0x40, 0xff, 0x05},
+ {0x40, 0xff, 0x01},
+ {0x41, 0xff, 0xca},
+ {0x41, 0xff, 0xc0},
+ {0x00, 0xff, 0x00}, /* change page to 0 */
+ {0, 0, 0}
+ };
+
+ mxl_dbg("()");
+
+ if (fe->ops.tuner_ops.set_params) {
+ ret = fe->ops.tuner_ops.set_params(fe, param);
+ if (mxl_fail(ret))
+ goto fail;
+ msleep(50);
+ }
+ ret = mxl111sf_demod_program_regs(state, phy_pll_patch);
+ mxl_fail(ret);
+ msleep(50);
+ ret = mxl1x1sf_demod_reset_irq_status(state);
+ mxl_fail(ret);
+ msleep(100);
+fail:
+ return ret;
+}
+
+/* ------------------------------------------------------------------------ */
+
+#if 0
+/* resets TS Packet error count */
+/* After setting 7th bit of V5_PER_COUNT_RESET_REG, it should be reset to 0. */
+static
+int mxl1x1sf_demod_reset_packet_error_count(struct mxl111sf_demod_state *state)
+{
+ struct mxl111sf_reg_ctrl_info reset_per_count[] = {
+ {0x20, 0x01, 0x01},
+ {0x20, 0x01, 0x00},
+ {0, 0, 0}
+ };
+ return mxl111sf_demod_program_regs(state, reset_per_count);
+}
+#endif
+
+/* returns TS Packet error count */
+/* PER Count = FEC_PER_COUNT * (2 ** (FEC_PER_SCALE * 4)) */
+static int mxl111sf_demod_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+ struct mxl111sf_demod_state *state = fe->demodulator_priv;
+ u32 fec_per_count, fec_per_scale;
+ u8 val;
+ int ret;
+
+ *ucblocks = 0;
+
+ /* FEC_PER_COUNT Register */
+ ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_COUNT_REG, &val);
+ if (mxl_fail(ret))
+ goto fail;
+
+ fec_per_count = val;
+
+ /* FEC_PER_SCALE Register */
+ ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_SCALE_REG, &val);
+ if (mxl_fail(ret))
+ goto fail;
+
+ val &= V6_FEC_PER_SCALE_MASK;
+ val *= 4;
+
+ fec_per_scale = 1 << val;
+
+ fec_per_count *= fec_per_scale;
+
+ *ucblocks = fec_per_count;
+fail:
+ return ret;
+}
+
+#define CALCULATE_BER(avg_errors, count) \
+ ((u32)(avg_errors * 4)/(count*64*188*8))
+#define CALCULATE_SNR(data) \
+ ((u32)((10 * (u32)data / 64) - 2.5))
+
+static int mxl111sf_demod_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+ struct mxl111sf_demod_state *state = fe->demodulator_priv;
+ u8 val1, val2, val3;
+ int ret;
+
+ *ber = 0;
+
+ ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_LSB_REG, &val1);
+ if (mxl_fail(ret))
+ goto fail;
+ ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_MSB_REG, &val2);
+ if (mxl_fail(ret))
+ goto fail;
+ ret = mxl111sf_demod_read_reg(state, V6_N_ACCUMULATE_REG, &val3);
+ if (mxl_fail(ret))
+ goto fail;
+
+ *ber = CALCULATE_BER((val1 | (val2 << 8)), val3);
+fail:
+ return ret;
+}
+
+static int mxl111sf_demod_calc_snr(struct mxl111sf_demod_state *state,
+ u16 *snr)
+{
+ u8 val1, val2;
+ int ret;
+
+ *snr = 0;
+
+ ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_LSB_REG, &val1);
+ if (mxl_fail(ret))
+ goto fail;
+ ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_MSB_REG, &val2);
+ if (mxl_fail(ret))
+ goto fail;
+
+ *snr = CALCULATE_SNR(val1 | ((val2 & 0x03) << 8));
+fail:
+ return ret;
+}
+
+static int mxl111sf_demod_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+ struct mxl111sf_demod_state *state = fe->demodulator_priv;
+
+ int ret = mxl111sf_demod_calc_snr(state, snr);
+ if (mxl_fail(ret))
+ goto fail;
+
+ *snr /= 10; /* 0.1 dB */
+fail:
+ return ret;
+}
+
+static int mxl111sf_demod_read_status(struct dvb_frontend *fe,
+ fe_status_t *status)
+{
+ struct mxl111sf_demod_state *state = fe->demodulator_priv;
+ int ret, locked, cr_lock, sync_lock, fec_lock;
+
+ *status = 0;
+
+ ret = mxl1x1sf_demod_get_rs_lock_status(state, &locked);
+ if (mxl_fail(ret))
+ goto fail;
+ ret = mxl1x1sf_demod_get_tps_lock_status(state, &cr_lock);
+ if (mxl_fail(ret))
+ goto fail;
+ ret = mxl1x1sf_demod_get_sync_lock_status(state, &sync_lock);
+ if (mxl_fail(ret))
+ goto fail;
+ ret = mxl1x1sf_demod_get_fec_lock_status(state, &fec_lock);
+ if (mxl_fail(ret))
+ goto fail;
+
+ if (locked)
+ *status |= FE_HAS_SIGNAL;
+ if (cr_lock)
+ *status |= FE_HAS_CARRIER;
+ if (sync_lock)
+ *status |= FE_HAS_SYNC;
+ if (fec_lock) /* false positives? */
+ *status |= FE_HAS_VITERBI;
+
+ if ((locked) && (cr_lock) && (sync_lock))
+ *status |= FE_HAS_LOCK;
+fail:
+ return ret;
+}
+
+static int mxl111sf_demod_read_signal_strength(struct dvb_frontend *fe,
+ u16 *signal_strength)
+{
+ struct mxl111sf_demod_state *state = fe->demodulator_priv;
+ fe_modulation_t constellation;
+ u16 snr;
+
+ mxl111sf_demod_calc_snr(state, &snr);
+ mxl1x1sf_demod_get_tps_constellation(state, &constellation);
+
+ switch (constellation) {
+ case QPSK:
+ *signal_strength = (snr >= 1300) ?
+ min(65535, snr * 44) : snr * 38;
+ break;
+ case QAM_16:
+ *signal_strength = (snr >= 1500) ?
+ min(65535, snr * 38) : snr * 33;
+ break;
+ case QAM_64:
+ *signal_strength = (snr >= 2000) ?
+ min(65535, snr * 29) : snr * 25;
+ break;
+ default:
+ *signal_strength = 0;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mxl111sf_demod_get_frontend(struct dvb_frontend *fe,
+ struct dvb_frontend_parameters *p)
+{
+ struct mxl111sf_demod_state *state = fe->demodulator_priv;
+
+ mxl_dbg("()");
+#if 0
+ p->inversion = /* FIXME */ ? INVERSION_ON : INVERSION_OFF;
+#endif
+ if (fe->ops.tuner_ops.get_bandwidth)
+ fe->ops.tuner_ops.get_bandwidth(fe, &p->u.ofdm.bandwidth);
+ if (fe->ops.tuner_ops.get_frequency)
+ fe->ops.tuner_ops.get_frequency(fe, &p->frequency);
+ mxl1x1sf_demod_get_tps_code_rate(state, &p->u.ofdm.code_rate_HP);
+ mxl1x1sf_demod_get_tps_code_rate(state, &p->u.ofdm.code_rate_LP);
+ mxl1x1sf_demod_get_tps_constellation(state, &p->u.ofdm.constellation);
+ mxl1x1sf_demod_get_tps_guard_fft_mode(state,
+ &p->u.ofdm.transmission_mode);
+ mxl1x1sf_demod_get_tps_guard_interval(state,
+ &p->u.ofdm.guard_interval);
+ mxl1x1sf_demod_get_tps_hierarchy(state,
+ &p->u.ofdm.hierarchy_information);
+
+ return 0;
+}
+
+static
+int mxl111sf_demod_get_tune_settings(struct dvb_frontend *fe,
+ struct dvb_frontend_tune_settings *tune)
+{
+ tune->min_delay_ms = 1000;
+ return 0;
+}
+
+static void mxl111sf_demod_release(struct dvb_frontend *fe)
+{
+ struct mxl111sf_demod_state *state = fe->demodulator_priv;
+ mxl_dbg("()");
+ kfree(state);
+ fe->demodulator_priv = NULL;
+}
+
+static struct dvb_frontend_ops mxl111sf_demod_ops = {
+
+ .info = {
+ .name = "MxL111SF DVB-T",
+ .type = FE_OFDM,
+ .frequency_min = 177000000,
+ .frequency_max = 858000000,
+ .frequency_stepsize = 166666,
+ .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_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
+ FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
+ },
+ .release = mxl111sf_demod_release,
+#if 0
+ .init = mxl111sf_init,
+ .i2c_gate_ctrl = mxl111sf_i2c_gate_ctrl,
+#endif
+ .set_frontend = mxl111sf_demod_set_frontend,
+ .get_frontend = mxl111sf_demod_get_frontend,
+ .get_tune_settings = mxl111sf_demod_get_tune_settings,
+ .read_status = mxl111sf_demod_read_status,
+ .read_signal_strength = mxl111sf_demod_read_signal_strength,
+ .read_ber = mxl111sf_demod_read_ber,
+ .read_snr = mxl111sf_demod_read_snr,
+ .read_ucblocks = mxl111sf_demod_read_ucblocks,
+};
+
+struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
+ struct mxl111sf_demod_config *cfg)
+{
+ struct mxl111sf_demod_state *state = NULL;
+
+ mxl_dbg("()");
+
+ state = kzalloc(sizeof(struct mxl111sf_demod_state), GFP_KERNEL);
+ if (state == NULL)
+ return NULL;
+
+ state->mxl_state = mxl_state;
+ state->cfg = cfg;
+
+ memcpy(&state->fe.ops, &mxl111sf_demod_ops,
+ sizeof(struct dvb_frontend_ops));
+
+ state->fe.demodulator_priv = state;
+ return &state->fe;
+}
+EXPORT_SYMBOL_GPL(mxl111sf_demod_attach);
+
+MODULE_DESCRIPTION("MaxLinear MxL111SF DVB-T demodulator driver");
+MODULE_AUTHOR("Michael Krufky <mkrufky@kernellabs.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1");
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff