--- /dev/null
+/*
+ Conexant 22702 DVB OFDM demodulator driver
+
+ based on:
+ Alps TDMB7 DVB OFDM demodulator driver
+
+ Copyright (C) 2001-2002 Convergence Integrated Media GmbH
+ Holger Waechtler <holger@convergence.de>
+
+ Copyright (C) 2004 Steven Toth <stoth@linuxtv.org>
+
+ 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 <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include "dvb_frontend.h"
+#include "cx22702.h"
+
+struct cx22702_state {
+
+ struct i2c_adapter *i2c;
+
+ /* configuration settings */
+ const struct cx22702_config *config;
+
+ struct dvb_frontend frontend;
+
+ /* previous uncorrected block counter */
+ u8 prevUCBlocks;
+};
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Enable verbose debug messages");
+
+#define dprintk if (debug) printk
+
+/* Register values to initialise the demod */
+static const u8 init_tab[] = {
+ 0x00, 0x00, /* Stop acquisition */
+ 0x0B, 0x06,
+ 0x09, 0x01,
+ 0x0D, 0x41,
+ 0x16, 0x32,
+ 0x20, 0x0A,
+ 0x21, 0x17,
+ 0x24, 0x3e,
+ 0x26, 0xff,
+ 0x27, 0x10,
+ 0x28, 0x00,
+ 0x29, 0x00,
+ 0x2a, 0x10,
+ 0x2b, 0x00,
+ 0x2c, 0x10,
+ 0x2d, 0x00,
+ 0x48, 0xd4,
+ 0x49, 0x56,
+ 0x6b, 0x1e,
+ 0xc8, 0x02,
+ 0xf9, 0x00,
+ 0xfa, 0x00,
+ 0xfb, 0x00,
+ 0xfc, 0x00,
+ 0xfd, 0x00,
+};
+
+static int cx22702_writereg(struct cx22702_state *state, u8 reg, u8 data)
+{
+ int ret;
+ u8 buf[] = { reg, data };
+ struct i2c_msg msg = {
+ .addr = state->config->demod_address, .flags = 0,
+ .buf = buf, .len = 2 };
+
+ ret = i2c_transfer(state->i2c, &msg, 1);
+
+ if (unlikely(ret != 1)) {
+ printk(KERN_ERR
+ "%s: error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
+ __func__, reg, data, ret);
+ return -1;
+ }
+
+ return 0;
+}
+
+static u8 cx22702_readreg(struct cx22702_state *state, u8 reg)
+{
+ int ret;
+ u8 data;
+
+ struct i2c_msg msg[] = {
+ { .addr = state->config->demod_address, .flags = 0,
+ .buf = ®, .len = 1 },
+ { .addr = state->config->demod_address, .flags = I2C_M_RD,
+ .buf = &data, .len = 1 } };
+
+ ret = i2c_transfer(state->i2c, msg, 2);
+
+ if (unlikely(ret != 2)) {
+ printk(KERN_ERR "%s: error (reg == 0x%02x, ret == %i)\n",
+ __func__, reg, ret);
+ return 0;
+ }
+
+ return data;
+}
+
+static int cx22702_set_inversion(struct cx22702_state *state, int inversion)
+{
+ u8 val;
+
+ val = cx22702_readreg(state, 0x0C);
+ switch (inversion) {
+ case INVERSION_AUTO:
+ return -EOPNOTSUPP;
+ case INVERSION_ON:
+ val |= 0x01;
+ break;
+ case INVERSION_OFF:
+ val &= 0xfe;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return cx22702_writereg(state, 0x0C, val);
+}
+
+/* Retrieve the demod settings */
+static int cx22702_get_tps(struct cx22702_state *state,
+ struct dtv_frontend_properties *p)
+{
+ u8 val;
+
+ /* Make sure the TPS regs are valid */
+ if (!(cx22702_readreg(state, 0x0A) & 0x20))
+ return -EAGAIN;
+
+ val = cx22702_readreg(state, 0x01);
+ switch ((val & 0x18) >> 3) {
+ case 0:
+ p->modulation = QPSK;
+ break;
+ case 1:
+ p->modulation = QAM_16;
+ break;
+ case 2:
+ p->modulation = QAM_64;
+ break;
+ }
+ switch (val & 0x07) {
+ case 0:
+ p->hierarchy = HIERARCHY_NONE;
+ break;
+ case 1:
+ p->hierarchy = HIERARCHY_1;
+ break;
+ case 2:
+ p->hierarchy = HIERARCHY_2;
+ break;
+ case 3:
+ p->hierarchy = HIERARCHY_4;
+ break;
+ }
+
+
+ val = cx22702_readreg(state, 0x02);
+ switch ((val & 0x38) >> 3) {
+ case 0:
+ p->code_rate_HP = FEC_1_2;
+ break;
+ case 1:
+ p->code_rate_HP = FEC_2_3;
+ break;
+ case 2:
+ p->code_rate_HP = FEC_3_4;
+ break;
+ case 3:
+ p->code_rate_HP = FEC_5_6;
+ break;
+ case 4:
+ p->code_rate_HP = FEC_7_8;
+ break;
+ }
+ switch (val & 0x07) {
+ case 0:
+ p->code_rate_LP = FEC_1_2;
+ break;
+ case 1:
+ p->code_rate_LP = FEC_2_3;
+ break;
+ case 2:
+ p->code_rate_LP = FEC_3_4;
+ break;
+ case 3:
+ p->code_rate_LP = FEC_5_6;
+ break;
+ case 4:
+ p->code_rate_LP = FEC_7_8;
+ break;
+ }
+
+ val = cx22702_readreg(state, 0x03);
+ switch ((val & 0x0c) >> 2) {
+ case 0:
+ p->guard_interval = GUARD_INTERVAL_1_32;
+ break;
+ case 1:
+ p->guard_interval = GUARD_INTERVAL_1_16;
+ break;
+ case 2:
+ p->guard_interval = GUARD_INTERVAL_1_8;
+ break;
+ case 3:
+ p->guard_interval = GUARD_INTERVAL_1_4;
+ break;
+ }
+ switch (val & 0x03) {
+ case 0:
+ p->transmission_mode = TRANSMISSION_MODE_2K;
+ break;
+ case 1:
+ p->transmission_mode = TRANSMISSION_MODE_8K;
+ break;
+ }
+
+ return 0;
+}
+
+static int cx22702_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
+{
+ struct cx22702_state *state = fe->demodulator_priv;
+ u8 val;
+
+ dprintk("%s(%d)\n", __func__, enable);
+ val = cx22702_readreg(state, 0x0D);
+ if (enable)
+ val &= 0xfe;
+ else
+ val |= 0x01;
+ return cx22702_writereg(state, 0x0D, val);
+}
+
+/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
+static int cx22702_set_tps(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+ u8 val;
+ struct cx22702_state *state = fe->demodulator_priv;
+
+ 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);
+ }
+
+ /* set inversion */
+ cx22702_set_inversion(state, p->inversion);
+
+ /* set bandwidth */
+ val = cx22702_readreg(state, 0x0C) & 0xcf;
+ switch (p->bandwidth_hz) {
+ case 6000000:
+ val |= 0x20;
+ break;
+ case 7000000:
+ val |= 0x10;
+ break;
+ case 8000000:
+ break;
+ default:
+ dprintk("%s: invalid bandwidth\n", __func__);
+ return -EINVAL;
+ }
+ cx22702_writereg(state, 0x0C, val);
+
+ p->code_rate_LP = FEC_AUTO; /* temp hack as manual not working */
+
+ /* use auto configuration? */
+ if ((p->hierarchy == HIERARCHY_AUTO) ||
+ (p->modulation == QAM_AUTO) ||
+ (p->code_rate_HP == FEC_AUTO) ||
+ (p->code_rate_LP == FEC_AUTO) ||
+ (p->guard_interval == GUARD_INTERVAL_AUTO) ||
+ (p->transmission_mode == TRANSMISSION_MODE_AUTO)) {
+
+ /* TPS Source - use hardware driven values */
+ cx22702_writereg(state, 0x06, 0x10);
+ cx22702_writereg(state, 0x07, 0x9);
+ cx22702_writereg(state, 0x08, 0xC1);
+ cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B)
+ & 0xfc);
+ cx22702_writereg(state, 0x0C,
+ (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40);
+ cx22702_writereg(state, 0x00, 0x01); /* Begin acquisition */
+ dprintk("%s: Autodetecting\n", __func__);
+ return 0;
+ }
+
+ /* manually programmed values */
+ switch (p->modulation) { /* mask 0x18 */
+ case QPSK:
+ val = 0x00;
+ break;
+ case QAM_16:
+ val = 0x08;
+ break;
+ case QAM_64:
+ val = 0x10;
+ break;
+ default:
+ dprintk("%s: invalid modulation\n", __func__);
+ return -EINVAL;
+ }
+ switch (p->hierarchy) { /* mask 0x07 */
+ case HIERARCHY_NONE:
+ break;
+ case HIERARCHY_1:
+ val |= 0x01;
+ break;
+ case HIERARCHY_2:
+ val |= 0x02;
+ break;
+ case HIERARCHY_4:
+ val |= 0x03;
+ break;
+ default:
+ dprintk("%s: invalid hierarchy\n", __func__);
+ return -EINVAL;
+ }
+ cx22702_writereg(state, 0x06, val);
+
+ switch (p->code_rate_HP) { /* mask 0x38 */
+ case FEC_NONE:
+ case FEC_1_2:
+ val = 0x00;
+ break;
+ case FEC_2_3:
+ val = 0x08;
+ break;
+ case FEC_3_4:
+ val = 0x10;
+ break;
+ case FEC_5_6:
+ val = 0x18;
+ break;
+ case FEC_7_8:
+ val = 0x20;
+ break;
+ default:
+ dprintk("%s: invalid code_rate_HP\n", __func__);
+ return -EINVAL;
+ }
+ switch (p->code_rate_LP) { /* mask 0x07 */
+ case FEC_NONE:
+ case FEC_1_2:
+ break;
+ case FEC_2_3:
+ val |= 0x01;
+ break;
+ case FEC_3_4:
+ val |= 0x02;
+ break;
+ case FEC_5_6:
+ val |= 0x03;
+ break;
+ case FEC_7_8:
+ val |= 0x04;
+ break;
+ default:
+ dprintk("%s: invalid code_rate_LP\n", __func__);
+ return -EINVAL;
+ }
+ cx22702_writereg(state, 0x07, val);
+
+ switch (p->guard_interval) { /* mask 0x0c */
+ case GUARD_INTERVAL_1_32:
+ val = 0x00;
+ break;
+ case GUARD_INTERVAL_1_16:
+ val = 0x04;
+ break;
+ case GUARD_INTERVAL_1_8:
+ val = 0x08;
+ break;
+ case GUARD_INTERVAL_1_4:
+ val = 0x0c;
+ break;
+ default:
+ dprintk("%s: invalid guard_interval\n", __func__);
+ return -EINVAL;
+ }
+ switch (p->transmission_mode) { /* mask 0x03 */
+ case TRANSMISSION_MODE_2K:
+ break;
+ case TRANSMISSION_MODE_8K:
+ val |= 0x1;
+ break;
+ default:
+ dprintk("%s: invalid transmission_mode\n", __func__);
+ return -EINVAL;
+ }
+ cx22702_writereg(state, 0x08, val);
+ cx22702_writereg(state, 0x0B,
+ (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02);
+ cx22702_writereg(state, 0x0C,
+ (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40);
+
+ /* Begin channel acquisition */
+ cx22702_writereg(state, 0x00, 0x01);
+
+ return 0;
+}
+
+/* Reset the demod hardware and reset all of the configuration registers
+ to a default state. */
+static int cx22702_init(struct dvb_frontend *fe)
+{
+ int i;
+ struct cx22702_state *state = fe->demodulator_priv;
+
+ cx22702_writereg(state, 0x00, 0x02);
+
+ msleep(10);
+
+ for (i = 0; i < ARRAY_SIZE(init_tab); i += 2)
+ cx22702_writereg(state, init_tab[i], init_tab[i + 1]);
+
+ cx22702_writereg(state, 0xf8, (state->config->output_mode << 1)
+ & 0x02);
+
+ cx22702_i2c_gate_ctrl(fe, 0);
+
+ return 0;
+}
+
+static int cx22702_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+ struct cx22702_state *state = fe->demodulator_priv;
+ u8 reg0A;
+ u8 reg23;
+
+ *status = 0;
+
+ reg0A = cx22702_readreg(state, 0x0A);
+ reg23 = cx22702_readreg(state, 0x23);
+
+ dprintk("%s: status demod=0x%02x agc=0x%02x\n"
+ , __func__, reg0A, reg23);
+
+ if (reg0A & 0x10) {
+ *status |= FE_HAS_LOCK;
+ *status |= FE_HAS_VITERBI;
+ *status |= FE_HAS_SYNC;
+ }
+
+ if (reg0A & 0x20)
+ *status |= FE_HAS_CARRIER;
+
+ if (reg23 < 0xf0)
+ *status |= FE_HAS_SIGNAL;
+
+ return 0;
+}
+
+static int cx22702_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+ struct cx22702_state *state = fe->demodulator_priv;
+
+ if (cx22702_readreg(state, 0xE4) & 0x02) {
+ /* Realtime statistics */
+ *ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7
+ | (cx22702_readreg(state, 0xDF) & 0x7F);
+ } else {
+ /* Averagtine statistics */
+ *ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7
+ | cx22702_readreg(state, 0xDF);
+ }
+
+ return 0;
+}
+
+static int cx22702_read_signal_strength(struct dvb_frontend *fe,
+ u16 *signal_strength)
+{
+ struct cx22702_state *state = fe->demodulator_priv;
+ u8 reg23;
+
+ /*
+ * Experience suggests that the strength signal register works as
+ * follows:
+ * - In the absence of signal, value is 0xff.
+ * - In the presence of a weak signal, bit 7 is set, not sure what
+ * the lower 7 bits mean.
+ * - In the presence of a strong signal, the register holds a 7-bit
+ * value (bit 7 is cleared), with greater values standing for
+ * weaker signals.
+ */
+ reg23 = cx22702_readreg(state, 0x23);
+ if (reg23 & 0x80) {
+ *signal_strength = 0;
+ } else {
+ reg23 = ~reg23 & 0x7f;
+ /* Scale to 16 bit */
+ *signal_strength = (reg23 << 9) | (reg23 << 2) | (reg23 >> 5);
+ }
+
+ return 0;
+}
+
+static int cx22702_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+ struct cx22702_state *state = fe->demodulator_priv;
+
+ u16 rs_ber;
+ if (cx22702_readreg(state, 0xE4) & 0x02) {
+ /* Realtime statistics */
+ rs_ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7
+ | (cx22702_readreg(state, 0xDF) & 0x7F);
+ } else {
+ /* Averagine statistics */
+ rs_ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 8
+ | cx22702_readreg(state, 0xDF);
+ }
+ *snr = ~rs_ber;
+
+ return 0;
+}
+
+static int cx22702_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+ struct cx22702_state *state = fe->demodulator_priv;
+
+ u8 _ucblocks;
+
+ /* RS Uncorrectable Packet Count then reset */
+ _ucblocks = cx22702_readreg(state, 0xE3);
+ if (state->prevUCBlocks < _ucblocks)
+ *ucblocks = (_ucblocks - state->prevUCBlocks);
+ else
+ *ucblocks = state->prevUCBlocks - _ucblocks;
+ state->prevUCBlocks = _ucblocks;
+
+ return 0;
+}
+
+static int cx22702_get_frontend(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct cx22702_state *state = fe->demodulator_priv;
+
+ u8 reg0C = cx22702_readreg(state, 0x0C);
+
+ c->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
+ return cx22702_get_tps(state, c);
+}
+
+static int cx22702_get_tune_settings(struct dvb_frontend *fe,
+ struct dvb_frontend_tune_settings *tune)
+{
+ tune->min_delay_ms = 1000;
+ return 0;
+}
+
+static void cx22702_release(struct dvb_frontend *fe)
+{
+ struct cx22702_state *state = fe->demodulator_priv;
+ kfree(state);
+}
+
+static const struct dvb_frontend_ops cx22702_ops;
+
+struct dvb_frontend *cx22702_attach(const struct cx22702_config *config,
+ struct i2c_adapter *i2c)
+{
+ struct cx22702_state *state = NULL;
+
+ /* allocate memory for the internal state */
+ state = kzalloc(sizeof(struct cx22702_state), GFP_KERNEL);
+ if (state == NULL)
+ goto error;
+
+ /* setup the state */
+ state->config = config;
+ state->i2c = i2c;
+
+ /* check if the demod is there */
+ if (cx22702_readreg(state, 0x1f) != 0x3)
+ goto error;
+
+ /* create dvb_frontend */
+ memcpy(&state->frontend.ops, &cx22702_ops,
+ sizeof(struct dvb_frontend_ops));
+ state->frontend.demodulator_priv = state;
+ return &state->frontend;
+
+error:
+ kfree(state);
+ return NULL;
+}
+EXPORT_SYMBOL(cx22702_attach);
+
+static const struct dvb_frontend_ops cx22702_ops = {
+ .delsys = { SYS_DVBT },
+ .info = {
+ .name = "Conexant CX22702 DVB-T",
+ .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 = cx22702_release,
+
+ .init = cx22702_init,
+ .i2c_gate_ctrl = cx22702_i2c_gate_ctrl,
+
+ .set_frontend = cx22702_set_tps,
+ .get_frontend = cx22702_get_frontend,
+ .get_tune_settings = cx22702_get_tune_settings,
+
+ .read_status = cx22702_read_status,
+ .read_ber = cx22702_read_ber,
+ .read_signal_strength = cx22702_read_signal_strength,
+ .read_snr = cx22702_read_snr,
+ .read_ucblocks = cx22702_read_ucblocks,
+};
+
+MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
+MODULE_AUTHOR("Steven Toth");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff