--- /dev/null
+/*
+ * E3C EC100 demodulator driver
+ *
+ * Copyright (C) 2009 Antti Palosaari <crope@iki.fi>
+ *
+ * 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 "ec100_priv.h"
+#include "ec100.h"
+
+int ec100_debug;
+module_param_named(debug, ec100_debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+struct ec100_state {
+ struct i2c_adapter *i2c;
+ struct dvb_frontend frontend;
+ struct ec100_config config;
+
+ u16 ber;
+};
+
+/* write single register */
+static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
+{
+ u8 buf[2] = {reg, val};
+ struct i2c_msg msg = {
+ .addr = state->config.demod_address,
+ .flags = 0,
+ .len = 2,
+ .buf = buf};
+
+ if (i2c_transfer(state->i2c, &msg, 1) != 1) {
+ warn("I2C write failed reg:%02x", reg);
+ return -EREMOTEIO;
+ }
+ return 0;
+}
+
+/* read single register */
+static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
+{
+ struct i2c_msg msg[2] = {
+ {
+ .addr = state->config.demod_address,
+ .flags = 0,
+ .len = 1,
+ .buf = ®
+ }, {
+ .addr = state->config.demod_address,
+ .flags = I2C_M_RD,
+ .len = 1,
+ .buf = val
+ }
+ };
+
+ if (i2c_transfer(state->i2c, msg, 2) != 2) {
+ warn("I2C read failed reg:%02x", reg);
+ return -EREMOTEIO;
+ }
+ return 0;
+}
+
+static int ec100_set_frontend(struct dvb_frontend *fe,
+ struct dvb_frontend_parameters *params)
+{
+ struct ec100_state *state = fe->demodulator_priv;
+ int ret;
+ u8 tmp, tmp2;
+
+ deb_info("%s: freq:%d bw:%d\n", __func__, params->frequency,
+ params->u.ofdm.bandwidth);
+
+ /* program tuner */
+ if (fe->ops.tuner_ops.set_params)
+ fe->ops.tuner_ops.set_params(fe, params);
+
+ ret = ec100_write_reg(state, 0x04, 0x06);
+ if (ret)
+ goto error;
+ ret = ec100_write_reg(state, 0x67, 0x58);
+ if (ret)
+ goto error;
+ ret = ec100_write_reg(state, 0x05, 0x18);
+ if (ret)
+ goto error;
+
+ /* reg/bw | 6 | 7 | 8
+ -------+------+------+------
+ A 0x1b | 0xa1 | 0xe7 | 0x2c
+ A 0x1c | 0x55 | 0x63 | 0x72
+ -------+------+------+------
+ B 0x1b | 0xb7 | 0x00 | 0x49
+ B 0x1c | 0x55 | 0x64 | 0x72 */
+
+ switch (params->u.ofdm.bandwidth) {
+ case BANDWIDTH_6_MHZ:
+ tmp = 0xb7;
+ tmp2 = 0x55;
+ break;
+ case BANDWIDTH_7_MHZ:
+ tmp = 0x00;
+ tmp2 = 0x64;
+ break;
+ case BANDWIDTH_8_MHZ:
+ default:
+ tmp = 0x49;
+ tmp2 = 0x72;
+ }
+
+ ret = ec100_write_reg(state, 0x1b, tmp);
+ if (ret)
+ goto error;
+ ret = ec100_write_reg(state, 0x1c, tmp2);
+ if (ret)
+ goto error;
+
+ ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */
+ if (ret)
+ goto error;
+ ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */
+ if (ret)
+ goto error;
+
+ ret = ec100_write_reg(state, 0x08, 0x24);
+ if (ret)
+ goto error;
+
+ ret = ec100_write_reg(state, 0x00, 0x00); /* go */
+ if (ret)
+ goto error;
+ ret = ec100_write_reg(state, 0x00, 0x20); /* go */
+ if (ret)
+ goto error;
+
+ return ret;
+error:
+ deb_info("%s: failed:%d\n", __func__, ret);
+ return ret;
+}
+
+static int ec100_get_tune_settings(struct dvb_frontend *fe,
+ struct dvb_frontend_tune_settings *fesettings)
+{
+ fesettings->min_delay_ms = 300;
+ fesettings->step_size = 0;
+ fesettings->max_drift = 0;
+
+ return 0;
+}
+
+static int ec100_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+ struct ec100_state *state = fe->demodulator_priv;
+ int ret;
+ u8 tmp;
+ *status = 0;
+
+ ret = ec100_read_reg(state, 0x42, &tmp);
+ if (ret)
+ goto error;
+
+ if (tmp & 0x80) {
+ /* bit7 set - have lock */
+ *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
+ FE_HAS_SYNC | FE_HAS_LOCK;
+ } else {
+ ret = ec100_read_reg(state, 0x01, &tmp);
+ if (ret)
+ goto error;
+
+ if (tmp & 0x10) {
+ /* bit4 set - have signal */
+ *status |= FE_HAS_SIGNAL;
+ if (!(tmp & 0x01)) {
+ /* bit0 clear - have ~valid signal */
+ *status |= FE_HAS_CARRIER | FE_HAS_VITERBI;
+ }
+ }
+ }
+
+ return ret;
+error:
+ deb_info("%s: failed:%d\n", __func__, ret);
+ return ret;
+}
+
+static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+ struct ec100_state *state = fe->demodulator_priv;
+ int ret;
+ u8 tmp, tmp2;
+ u16 ber2;
+
+ *ber = 0;
+
+ ret = ec100_read_reg(state, 0x65, &tmp);
+ if (ret)
+ goto error;
+ ret = ec100_read_reg(state, 0x66, &tmp2);
+ if (ret)
+ goto error;
+
+ ber2 = (tmp2 << 8) | tmp;
+
+ /* if counter overflow or clear */
+ if (ber2 < state->ber)
+ *ber = ber2;
+ else
+ *ber = ber2 - state->ber;
+
+ state->ber = ber2;
+
+ return ret;
+error:
+ deb_info("%s: failed:%d\n", __func__, ret);
+ return ret;
+}
+
+static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
+{
+ struct ec100_state *state = fe->demodulator_priv;
+ int ret;
+ u8 tmp;
+
+ ret = ec100_read_reg(state, 0x24, &tmp);
+ if (ret) {
+ *strength = 0;
+ goto error;
+ }
+
+ *strength = ((tmp << 8) | tmp);
+
+ return ret;
+error:
+ deb_info("%s: failed:%d\n", __func__, ret);
+ return ret;
+}
+
+static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+ *snr = 0;
+ return 0;
+}
+
+static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+ *ucblocks = 0;
+ return 0;
+}
+
+static void ec100_release(struct dvb_frontend *fe)
+{
+ struct ec100_state *state = fe->demodulator_priv;
+ kfree(state);
+}
+
+static struct dvb_frontend_ops ec100_ops;
+
+struct dvb_frontend *ec100_attach(const struct ec100_config *config,
+ struct i2c_adapter *i2c)
+{
+ int ret;
+ struct ec100_state *state = NULL;
+ u8 tmp;
+
+ /* allocate memory for the internal state */
+ state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);
+ if (state == NULL)
+ goto error;
+
+ /* setup the state */
+ state->i2c = i2c;
+ memcpy(&state->config, config, sizeof(struct ec100_config));
+
+ /* check if the demod is there */
+ ret = ec100_read_reg(state, 0x33, &tmp);
+ if (ret || tmp != 0x0b)
+ goto error;
+
+ /* create dvb_frontend */
+ memcpy(&state->frontend.ops, &ec100_ops,
+ sizeof(struct dvb_frontend_ops));
+ state->frontend.demodulator_priv = state;
+
+ return &state->frontend;
+error:
+ kfree(state);
+ return NULL;
+}
+EXPORT_SYMBOL(ec100_attach);
+
+static struct dvb_frontend_ops ec100_ops = {
+ .info = {
+ .name = "E3C EC100 DVB-T",
+ .type = FE_OFDM,
+ .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_MUTE_TS
+ },
+
+ .release = ec100_release,
+ .set_frontend = ec100_set_frontend,
+ .get_tune_settings = ec100_get_tune_settings,
+ .read_status = ec100_read_status,
+ .read_ber = ec100_read_ber,
+ .read_signal_strength = ec100_read_signal_strength,
+ .read_snr = ec100_read_snr,
+ .read_ucblocks = ec100_read_ucblocks,
+};
+
+MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
+MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
+MODULE_LICENSE("GPL");
projects / linux-beck.git / commitdiff