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path: root/drivers/media/dvb/frontends/cx22702.c
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Diffstat (limited to 'drivers/media/dvb/frontends/cx22702.c')
-rw-r--r--drivers/media/dvb/frontends/cx22702.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/cx22702.c b/drivers/media/dvb/frontends/cx22702.c
new file mode 100644
index 000000000000..1930b513eefa
--- /dev/null
+++ b/drivers/media/dvb/frontends/cx22702.c
@@ -0,0 +1,519 @@
+/*
+ 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 <steve@toth.demon.co.uk>
+
+ 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;
+
+ struct dvb_frontend_ops ops;
+
+ /* configuration settings */
+ const struct cx22702_config* config;
+
+ struct dvb_frontend frontend;
+
+ /* previous uncorrected block counter */
+ u8 prevUCBlocks;
+};
+
+static int debug = 0;
+#define dprintk if (debug) printk
+
+/* Register values to initialise the demod */
+static u8 init_tab [] = {
+ 0x00, 0x00, /* Stop aquisition */
+ 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,
+ 0xf8, 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 (ret != 1)
+ printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
+ __FUNCTION__, reg, data, ret);
+
+ return (ret != 1) ? -1 : 0;
+}
+
+static u8 cx22702_readreg (struct cx22702_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 (ret == %i)\n", __FUNCTION__, ret);
+
+ return b1[0];
+}
+
+static int cx22702_set_inversion (struct cx22702_state *state, int inversion)
+{
+ u8 val;
+
+ switch (inversion) {
+
+ case INVERSION_AUTO:
+ return -EOPNOTSUPP;
+
+ case INVERSION_ON:
+ val = cx22702_readreg (state, 0x0C);
+ return cx22702_writereg (state, 0x0C, val | 0x01);
+
+ case INVERSION_OFF:
+ val = cx22702_readreg (state, 0x0C);
+ return cx22702_writereg (state, 0x0C, val & 0xfe);
+
+ default:
+ return -EINVAL;
+
+ }
+
+}
+
+/* Retrieve the demod settings */
+static int cx22702_get_tps (struct cx22702_state *state, struct dvb_ofdm_parameters *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->constellation = QPSK; break;
+ case 1: p->constellation = QAM_16; break;
+ case 2: p->constellation = QAM_64; break;
+ }
+ switch( val&0x07 ) {
+ case 0: p->hierarchy_information = HIERARCHY_NONE; break;
+ case 1: p->hierarchy_information = HIERARCHY_1; break;
+ case 2: p->hierarchy_information = HIERARCHY_2; break;
+ case 3: p->hierarchy_information = 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;
+}
+
+/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
+static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
+{
+ u8 val;
+ struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
+
+ /* set PLL */
+ cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) &0xfe);
+ state->config->pll_set(fe, p);
+ cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) | 1);
+
+ /* set inversion */
+ cx22702_set_inversion (state, p->inversion);
+
+ /* set bandwidth */
+ switch(p->u.ofdm.bandwidth) {
+ case BANDWIDTH_6_MHZ:
+ cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 );
+ break;
+ case BANDWIDTH_7_MHZ:
+ cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 );
+ break;
+ case BANDWIDTH_8_MHZ:
+ cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf );
+ break;
+ default:
+ dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
+ return -EINVAL;
+ }
+
+
+ p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working
+
+ /* use auto configuration? */
+ if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) ||
+ (p->u.ofdm.constellation==QAM_AUTO) ||
+ (p->u.ofdm.code_rate_HP==FEC_AUTO) ||
+ (p->u.ofdm.code_rate_LP==FEC_AUTO) ||
+ (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) ||
+ (p->u.ofdm.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 aquisition */
+ printk("%s: Autodetecting\n",__FUNCTION__);
+ return 0;
+ }
+
+ /* manually programmed values */
+ val=0;
+ switch(p->u.ofdm.constellation) {
+ case QPSK: val = (val&0xe7); break;
+ case QAM_16: val = (val&0xe7)|0x08; break;
+ case QAM_64: val = (val&0xe7)|0x10; break;
+ default:
+ dprintk ("%s: invalid constellation\n",__FUNCTION__);
+ return -EINVAL;
+ }
+ switch(p->u.ofdm.hierarchy_information) {
+ case HIERARCHY_NONE: val = (val&0xf8); break;
+ case HIERARCHY_1: val = (val&0xf8)|1; break;
+ case HIERARCHY_2: val = (val&0xf8)|2; break;
+ case HIERARCHY_4: val = (val&0xf8)|3; break;
+ default:
+ dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
+ return -EINVAL;
+ }
+ cx22702_writereg (state, 0x06, val);
+
+ val=0;
+ switch(p->u.ofdm.code_rate_HP) {
+ case FEC_NONE:
+ case FEC_1_2: val = (val&0xc7); break;
+ case FEC_2_3: val = (val&0xc7)|0x08; break;
+ case FEC_3_4: val = (val&0xc7)|0x10; break;
+ case FEC_5_6: val = (val&0xc7)|0x18; break;
+ case FEC_7_8: val = (val&0xc7)|0x20; break;
+ default:
+ dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
+ return -EINVAL;
+ }
+ switch(p->u.ofdm.code_rate_LP) {
+ case FEC_NONE:
+ case FEC_1_2: val = (val&0xf8); break;
+ case FEC_2_3: val = (val&0xf8)|1; break;
+ case FEC_3_4: val = (val&0xf8)|2; break;
+ case FEC_5_6: val = (val&0xf8)|3; break;
+ case FEC_7_8: val = (val&0xf8)|4; break;
+ default:
+ dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
+ return -EINVAL;
+ }
+ cx22702_writereg (state, 0x07, val);
+
+ val=0;
+ switch(p->u.ofdm.guard_interval) {
+ case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
+ case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
+ case GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
+ case GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
+ default:
+ dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
+ return -EINVAL;
+ }
+ switch(p->u.ofdm.transmission_mode) {
+ case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
+ case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
+ default:
+ dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
+ 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 aquisition */
+ 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 = (struct cx22702_state*) fe->demodulator_priv;
+
+ cx22702_writereg (state, 0x00, 0x02);
+
+ msleep(10);
+
+ for (i=0; i<sizeof(init_tab); i+=2)
+ cx22702_writereg (state, init_tab[i], init_tab[i+1]);
+
+
+ /* init PLL */
+ if (state->config->pll_init) {
+ cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) &0xfe);
+ state->config->pll_init(fe);
+ cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) | 1);
+ }
+
+ return 0;
+}
+
+static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+ struct cx22702_state* state = (struct cx22702_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"
+ ,__FUNCTION__,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 = (struct cx22702_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 = (struct cx22702_state*) fe->demodulator_priv;
+
+ *signal_strength = cx22702_readreg (state, 0x23);
+
+ return 0;
+}
+
+static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+ struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
+
+ u16 rs_ber=0;
+ 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 = (struct cx22702_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 dvb_frontend_parameters *p)
+{
+ struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
+
+ u8 reg0C = cx22702_readreg (state, 0x0C);
+
+ p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
+ return cx22702_get_tps (state, &p->u.ofdm);
+}
+
+static void cx22702_release(struct dvb_frontend* fe)
+{
+ struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
+ kfree(state);
+}
+
+static 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 = (struct cx22702_state*) kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
+ if (state == NULL) goto error;
+
+ /* setup the state */
+ state->config = config;
+ state->i2c = i2c;
+ memcpy(&state->ops, &cx22702_ops, sizeof(struct dvb_frontend_ops));
+ state->prevUCBlocks = 0;
+
+ /* check if the demod is there */
+ if (cx22702_readreg(state, 0x1f) != 0x3) goto error;
+
+ /* create dvb_frontend */
+ state->frontend.ops = &state->ops;
+ state->frontend.demodulator_priv = state;
+ return &state->frontend;
+
+error:
+ kfree(state);
+ return NULL;
+}
+
+static struct dvb_frontend_ops cx22702_ops = {
+
+ .info = {
+ .name = "Conexant CX22702 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 = cx22702_release,
+
+ .init = cx22702_init,
+
+ .set_frontend = cx22702_set_tps,
+ .get_frontend = cx22702_get_frontend,
+
+ .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_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Enable verbose debug messages");
+
+MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
+MODULE_AUTHOR("Steven Toth");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(cx22702_attach);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-29 11:47:15 +0300