--- /dev/null
+/*
+ Conexant cx22700 DVB OFDM demodulator driver
+
+ Copyright (C) 2001-2002 Convergence Integrated Media GmbH
+ Holger Waechtler <holger@convergence.de>
+
+ 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 "dvb_frontend.h"
+#include "cx22700.h"
+
+
+struct cx22700_state {
+
+ struct i2c_adapter* i2c;
+
+ const struct cx22700_config* config;
+
+ struct dvb_frontend frontend;
+};
+
+
+static int debug;
+#define dprintk(args...) \
+ do { \
+ if (debug) printk(KERN_DEBUG "cx22700: " args); \
+ } while (0)
+
+static u8 init_tab [] = {
+ 0x04, 0x10,
+ 0x05, 0x09,
+ 0x06, 0x00,
+ 0x08, 0x04,
+ 0x09, 0x00,
+ 0x0a, 0x01,
+ 0x15, 0x40,
+ 0x16, 0x10,
+ 0x17, 0x87,
+ 0x18, 0x17,
+ 0x1a, 0x10,
+ 0x25, 0x04,
+ 0x2e, 0x00,
+ 0x39, 0x00,
+ 0x3a, 0x04,
+ 0x45, 0x08,
+ 0x46, 0x02,
+ 0x47, 0x05,
+};
+
+
+static int cx22700_writereg (struct cx22700_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 };
+
+ dprintk ("%s\n", __func__);
+
+ ret = i2c_transfer (state->i2c, &msg, 1);
+
+ if (ret != 1)
+ printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
+ __func__, reg, data, ret);
+
+ return (ret != 1) ? -1 : 0;
+}
+
+static int cx22700_readreg (struct cx22700_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 } };
+
+ dprintk ("%s\n", __func__);
+
+ ret = i2c_transfer (state->i2c, msg, 2);
+
+ if (ret != 2) return -EIO;
+
+ return b1[0];
+}
+
+static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
+{
+ u8 val;
+
+ dprintk ("%s\n", __func__);
+
+ switch (inversion) {
+ case INVERSION_AUTO:
+ return -EOPNOTSUPP;
+ case INVERSION_ON:
+ val = cx22700_readreg (state, 0x09);
+ return cx22700_writereg (state, 0x09, val | 0x01);
+ case INVERSION_OFF:
+ val = cx22700_readreg (state, 0x09);
+ return cx22700_writereg (state, 0x09, val & 0xfe);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int cx22700_set_tps(struct cx22700_state *state,
+ struct dtv_frontend_properties *p)
+{
+ static const u8 qam_tab [4] = { 0, 1, 0, 2 };
+ static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
+ u8 val;
+
+ dprintk ("%s\n", __func__);
+
+ if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
+ return -EINVAL;
+
+ if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
+ return -EINVAL;
+
+ if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
+ return -EINVAL;
+
+ if ((int)p->guard_interval < GUARD_INTERVAL_1_32 ||
+ p->guard_interval > GUARD_INTERVAL_1_4)
+ return -EINVAL;
+
+ if (p->transmission_mode != TRANSMISSION_MODE_2K &&
+ p->transmission_mode != TRANSMISSION_MODE_8K)
+ return -EINVAL;
+
+ if (p->modulation != QPSK &&
+ p->modulation != QAM_16 &&
+ p->modulation != QAM_64)
+ return -EINVAL;
+
+ if ((int)p->hierarchy < HIERARCHY_NONE ||
+ p->hierarchy > HIERARCHY_4)
+ return -EINVAL;
+
+ if (p->bandwidth_hz > 8000000 || p->bandwidth_hz < 6000000)
+ return -EINVAL;
+
+ if (p->bandwidth_hz == 7000000)
+ cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
+ else
+ cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
+
+ val = qam_tab[p->modulation - QPSK];
+ val |= p->hierarchy - HIERARCHY_NONE;
+
+ cx22700_writereg (state, 0x04, val);
+
+ if (p->code_rate_HP - FEC_1_2 >= sizeof(fec_tab) ||
+ p->code_rate_LP - FEC_1_2 >= sizeof(fec_tab))
+ return -EINVAL;
+ val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
+ val |= fec_tab[p->code_rate_LP - FEC_1_2];
+
+ cx22700_writereg (state, 0x05, val);
+
+ val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
+ val |= p->transmission_mode - TRANSMISSION_MODE_2K;
+
+ cx22700_writereg (state, 0x06, val);
+
+ cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */
+ cx22700_writereg (state, 0x08, 0x04); /* restart acquisition */
+
+ return 0;
+}
+
+static int cx22700_get_tps(struct cx22700_state *state,
+ struct dtv_frontend_properties *p)
+{
+ static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
+ static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
+ FEC_5_6, FEC_7_8 };
+ u8 val;
+
+ dprintk ("%s\n", __func__);
+
+ if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */
+ return -EAGAIN;
+
+ val = cx22700_readreg (state, 0x01);
+
+ if ((val & 0x7) > 4)
+ p->hierarchy = HIERARCHY_AUTO;
+ else
+ p->hierarchy = HIERARCHY_NONE + (val & 0x7);
+
+ if (((val >> 3) & 0x3) > 2)
+ p->modulation = QAM_AUTO;
+ else
+ p->modulation = qam_tab[(val >> 3) & 0x3];
+
+ val = cx22700_readreg (state, 0x02);
+
+ if (((val >> 3) & 0x07) > 4)
+ p->code_rate_HP = FEC_AUTO;
+ else
+ p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
+
+ if ((val & 0x07) > 4)
+ p->code_rate_LP = FEC_AUTO;
+ else
+ p->code_rate_LP = fec_tab[val & 0x07];
+
+ val = cx22700_readreg (state, 0x03);
+
+ p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
+ p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
+
+ return 0;
+}
+
+static int cx22700_init (struct dvb_frontend* fe)
+
+{ struct cx22700_state* state = fe->demodulator_priv;
+ int i;
+
+ dprintk("cx22700_init: init chip\n");
+
+ cx22700_writereg (state, 0x00, 0x02); /* soft reset */
+ cx22700_writereg (state, 0x00, 0x00);
+
+ msleep(10);
+
+ for (i=0; i<sizeof(init_tab); i+=2)
+ cx22700_writereg (state, init_tab[i], init_tab[i+1]);
+
+ cx22700_writereg (state, 0x00, 0x01);
+
+ return 0;
+}
+
+static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+ struct cx22700_state* state = fe->demodulator_priv;
+
+ u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
+ | (cx22700_readreg (state, 0x0e) << 1);
+ u8 sync = cx22700_readreg (state, 0x07);
+
+ *status = 0;
+
+ if (rs_ber < 0xff00)
+ *status |= FE_HAS_SIGNAL;
+
+ if (sync & 0x20)
+ *status |= FE_HAS_CARRIER;
+
+ if (sync & 0x10)
+ *status |= FE_HAS_VITERBI;
+
+ if (sync & 0x10)
+ *status |= FE_HAS_SYNC;
+
+ if (*status == 0x0f)
+ *status |= FE_HAS_LOCK;
+
+ return 0;
+}
+
+static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
+{
+ struct cx22700_state* state = fe->demodulator_priv;
+
+ *ber = cx22700_readreg (state, 0x0c) & 0x7f;
+ cx22700_writereg (state, 0x0c, 0x00);
+
+ return 0;
+}
+
+static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
+{
+ struct cx22700_state* state = fe->demodulator_priv;
+
+ u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
+ | (cx22700_readreg (state, 0x0e) << 1);
+ *signal_strength = ~rs_ber;
+
+ return 0;
+}
+
+static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+ struct cx22700_state* state = fe->demodulator_priv;
+
+ u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
+ | (cx22700_readreg (state, 0x0e) << 1);
+ *snr = ~rs_ber;
+
+ return 0;
+}
+
+static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
+{
+ struct cx22700_state* state = fe->demodulator_priv;
+
+ *ucblocks = cx22700_readreg (state, 0x0f);
+ cx22700_writereg (state, 0x0f, 0x00);
+
+ return 0;
+}
+
+static int cx22700_set_frontend(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct cx22700_state* state = fe->demodulator_priv;
+
+ cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
+ cx22700_writereg (state, 0x00, 0x00);
+
+ 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);
+ }
+
+ cx22700_set_inversion(state, c->inversion);
+ cx22700_set_tps(state, c);
+ cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */
+ cx22700_writereg (state, 0x00, 0x01); /* restart acquire */
+
+ return 0;
+}
+
+static int cx22700_get_frontend(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct cx22700_state* state = fe->demodulator_priv;
+ u8 reg09 = cx22700_readreg (state, 0x09);
+
+ c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
+ return cx22700_get_tps(state, c);
+}
+
+static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
+{
+ struct cx22700_state* state = fe->demodulator_priv;
+
+ if (enable) {
+ return cx22700_writereg(state, 0x0a, 0x00);
+ } else {
+ return cx22700_writereg(state, 0x0a, 0x01);
+ }
+}
+
+static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
+{
+ fesettings->min_delay_ms = 150;
+ fesettings->step_size = 166667;
+ fesettings->max_drift = 166667*2;
+ return 0;
+}
+
+static void cx22700_release(struct dvb_frontend* fe)
+{
+ struct cx22700_state* state = fe->demodulator_priv;
+ kfree(state);
+}
+
+static struct dvb_frontend_ops cx22700_ops;
+
+struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
+ struct i2c_adapter* i2c)
+{
+ struct cx22700_state* state = NULL;
+
+ /* allocate memory for the internal state */
+ state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);
+ if (state == NULL) goto error;
+
+ /* setup the state */
+ state->config = config;
+ state->i2c = i2c;
+
+ /* check if the demod is there */
+ if (cx22700_readreg(state, 0x07) < 0) goto error;
+
+ /* create dvb_frontend */
+ memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
+ state->frontend.demodulator_priv = state;
+ return &state->frontend;
+
+error:
+ kfree(state);
+ return NULL;
+}
+
+static struct dvb_frontend_ops cx22700_ops = {
+ .delsys = { SYS_DVBT },
+ .info = {
+ .name = "Conexant CX22700 DVB-T",
+ .frequency_min = 470000000,
+ .frequency_max = 860000000,
+ .frequency_stepsize = 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_RECOVER
+ },
+
+ .release = cx22700_release,
+
+ .init = cx22700_init,
+ .i2c_gate_ctrl = cx22700_i2c_gate_ctrl,
+
+ .set_frontend = cx22700_set_frontend,
+ .get_frontend = cx22700_get_frontend,
+ .get_tune_settings = cx22700_get_tune_settings,
+
+ .read_status = cx22700_read_status,
+ .read_ber = cx22700_read_ber,
+ .read_signal_strength = cx22700_read_signal_strength,
+ .read_snr = cx22700_read_snr,
+ .read_ucblocks = cx22700_read_ucblocks,
+};
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
+MODULE_AUTHOR("Holger Waechtler");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(cx22700_attach);
Code Review / kvmfornfv.git / blobdiff