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path: root/drivers/media/dvb/frontends/l64781.c
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Diffstat (limited to 'drivers/media/dvb/frontends/l64781.c')
-rw-r--r--drivers/media/dvb/frontends/l64781.c609
1 files changed, 609 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/l64781.c b/drivers/media/dvb/frontends/l64781.c
new file mode 100644
index 00000000..36fcf559
--- /dev/null
+++ b/drivers/media/dvb/frontends/l64781.c
@@ -0,0 +1,609 @@
+/*
+ driver for LSI L64781 COFDM demodulator
+
+ Copyright (C) 2001 Holger Waechtler for Convergence Integrated Media GmbH
+ Marko Kohtala <marko.kohtala@luukku.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 <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include "dvb_frontend.h"
+#include "l64781.h"
+
+
+struct l64781_state {
+ struct i2c_adapter* i2c;
+ const struct l64781_config* config;
+ struct dvb_frontend frontend;
+
+ /* private demodulator data */
+ unsigned int first:1;
+};
+
+#define dprintk(args...) \
+ do { \
+ if (debug) printk(KERN_DEBUG "l64781: " args); \
+ } while (0)
+
+static int debug;
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+
+static int l64781_writereg (struct l64781_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 };
+
+ if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1)
+ dprintk ("%s: write_reg error (reg == %02x) = %02x!\n",
+ __func__, reg, ret);
+
+ return (ret != 1) ? -1 : 0;
+}
+
+static int l64781_readreg (struct l64781_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) return ret;
+
+ return b1[0];
+}
+
+static void apply_tps (struct l64781_state* state)
+{
+ l64781_writereg (state, 0x2a, 0x00);
+ l64781_writereg (state, 0x2a, 0x01);
+
+ /* This here is a little bit questionable because it enables
+ the automatic update of TPS registers. I think we'd need to
+ handle the IRQ from FE to update some other registers as
+ well, or at least implement some magic to tuning to correct
+ to the TPS received from transmission. */
+ l64781_writereg (state, 0x2a, 0x02);
+}
+
+
+static void reset_afc (struct l64781_state* state)
+{
+ /* Set AFC stall for the AFC_INIT_FRQ setting, TIM_STALL for
+ timing offset */
+ l64781_writereg (state, 0x07, 0x9e); /* stall AFC */
+ l64781_writereg (state, 0x08, 0); /* AFC INIT FREQ */
+ l64781_writereg (state, 0x09, 0);
+ l64781_writereg (state, 0x0a, 0);
+ l64781_writereg (state, 0x07, 0x8e);
+ l64781_writereg (state, 0x0e, 0); /* AGC gain to zero in beginning */
+ l64781_writereg (state, 0x11, 0x80); /* stall TIM */
+ l64781_writereg (state, 0x10, 0); /* TIM_OFFSET_LSB */
+ l64781_writereg (state, 0x12, 0);
+ l64781_writereg (state, 0x13, 0);
+ l64781_writereg (state, 0x11, 0x00);
+}
+
+static int reset_and_configure (struct l64781_state* state)
+{
+ u8 buf [] = { 0x06 };
+ struct i2c_msg msg = { .addr = 0x00, .flags = 0, .buf = buf, .len = 1 };
+ // NOTE: this is correct in writing to address 0x00
+
+ return (i2c_transfer(state->i2c, &msg, 1) == 1) ? 0 : -ENODEV;
+}
+
+static int apply_frontend_param(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+ struct l64781_state* state = fe->demodulator_priv;
+ /* The coderates for FEC_NONE, FEC_4_5 and FEC_FEC_6_7 are arbitrary */
+ static const u8 fec_tab[] = { 7, 0, 1, 2, 9, 3, 10, 4 };
+ /* QPSK, QAM_16, QAM_64 */
+ static const u8 qam_tab [] = { 2, 4, 0, 6 };
+ static const u8 guard_tab [] = { 1, 2, 4, 8 };
+ /* The Grundig 29504-401.04 Tuner comes with 18.432MHz crystal. */
+ static const u32 ppm = 8000;
+ u32 ddfs_offset_fixed;
+/* u32 ddfs_offset_variable = 0x6000-((1000000UL+ppm)/ */
+/* bw_tab[p->bandWidth]<<10)/15625; */
+ u32 init_freq;
+ u32 spi_bias;
+ u8 val0x04;
+ u8 val0x05;
+ u8 val0x06;
+ int bw;
+
+ switch (p->bandwidth_hz) {
+ case 8000000:
+ bw = 8;
+ break;
+ case 7000000:
+ bw = 7;
+ break;
+ case 6000000:
+ bw = 6;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ 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);
+ }
+
+ if (p->inversion != INVERSION_ON &&
+ p->inversion != INVERSION_OFF)
+ return -EINVAL;
+
+ if (p->code_rate_HP != FEC_1_2 && p->code_rate_HP != FEC_2_3 &&
+ p->code_rate_HP != FEC_3_4 && p->code_rate_HP != FEC_5_6 &&
+ p->code_rate_HP != FEC_7_8)
+ return -EINVAL;
+
+ if (p->hierarchy != HIERARCHY_NONE &&
+ (p->code_rate_LP != FEC_1_2 && p->code_rate_LP != FEC_2_3 &&
+ p->code_rate_LP != FEC_3_4 && p->code_rate_LP != FEC_5_6 &&
+ p->code_rate_LP != FEC_7_8))
+ return -EINVAL;
+
+ if (p->modulation != QPSK && p->modulation != QAM_16 &&
+ p->modulation != QAM_64)
+ return -EINVAL;
+
+ if (p->transmission_mode != TRANSMISSION_MODE_2K &&
+ p->transmission_mode != TRANSMISSION_MODE_8K)
+ return -EINVAL;
+
+ if (p->guard_interval < GUARD_INTERVAL_1_32 ||
+ p->guard_interval > GUARD_INTERVAL_1_4)
+ return -EINVAL;
+
+ if (p->hierarchy < HIERARCHY_NONE ||
+ p->hierarchy > HIERARCHY_4)
+ return -EINVAL;
+
+ ddfs_offset_fixed = 0x4000-(ppm<<16)/bw/1000000;
+
+ /* This works up to 20000 ppm, it overflows if too large ppm! */
+ init_freq = (((8UL<<25) + (8UL<<19) / 25*ppm / (15625/25)) /
+ bw & 0xFFFFFF);
+
+ /* SPI bias calculation is slightly modified to fit in 32bit */
+ /* will work for high ppm only... */
+ spi_bias = 378 * (1 << 10);
+ spi_bias *= 16;
+ spi_bias *= bw;
+ spi_bias *= qam_tab[p->modulation];
+ spi_bias /= p->code_rate_HP + 1;
+ spi_bias /= (guard_tab[p->guard_interval] + 32);
+ spi_bias *= 1000;
+ spi_bias /= 1000 + ppm/1000;
+ spi_bias *= p->code_rate_HP;
+
+ val0x04 = (p->transmission_mode << 2) | p->guard_interval;
+ val0x05 = fec_tab[p->code_rate_HP];
+
+ if (p->hierarchy != HIERARCHY_NONE)
+ val0x05 |= (p->code_rate_LP - FEC_1_2) << 3;
+
+ val0x06 = (p->hierarchy << 2) | p->modulation;
+
+ l64781_writereg (state, 0x04, val0x04);
+ l64781_writereg (state, 0x05, val0x05);
+ l64781_writereg (state, 0x06, val0x06);
+
+ reset_afc (state);
+
+ /* Technical manual section 2.6.1, TIM_IIR_GAIN optimal values */
+ l64781_writereg (state, 0x15,
+ p->transmission_mode == TRANSMISSION_MODE_2K ? 1 : 3);
+ l64781_writereg (state, 0x16, init_freq & 0xff);
+ l64781_writereg (state, 0x17, (init_freq >> 8) & 0xff);
+ l64781_writereg (state, 0x18, (init_freq >> 16) & 0xff);
+
+ l64781_writereg (state, 0x1b, spi_bias & 0xff);
+ l64781_writereg (state, 0x1c, (spi_bias >> 8) & 0xff);
+ l64781_writereg (state, 0x1d, ((spi_bias >> 16) & 0x7f) |
+ (p->inversion == INVERSION_ON ? 0x80 : 0x00));
+
+ l64781_writereg (state, 0x22, ddfs_offset_fixed & 0xff);
+ l64781_writereg (state, 0x23, (ddfs_offset_fixed >> 8) & 0x3f);
+
+ l64781_readreg (state, 0x00); /* clear interrupt registers... */
+ l64781_readreg (state, 0x01); /* dto. */
+
+ apply_tps (state);
+
+ return 0;
+}
+
+static int get_frontend(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+ struct l64781_state* state = fe->demodulator_priv;
+ int tmp;
+
+
+ tmp = l64781_readreg(state, 0x04);
+ switch(tmp & 3) {
+ 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((tmp >> 2) & 3) {
+ case 0:
+ p->transmission_mode = TRANSMISSION_MODE_2K;
+ break;
+ case 1:
+ p->transmission_mode = TRANSMISSION_MODE_8K;
+ break;
+ default:
+ printk(KERN_WARNING "Unexpected value for transmission_mode\n");
+ }
+
+ tmp = l64781_readreg(state, 0x05);
+ switch(tmp & 7) {
+ 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;
+ default:
+ printk("Unexpected value for code_rate_HP\n");
+ }
+ switch((tmp >> 3) & 7) {
+ 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;
+ default:
+ printk("Unexpected value for code_rate_LP\n");
+ }
+
+ tmp = l64781_readreg(state, 0x06);
+ switch(tmp & 3) {
+ case 0:
+ p->modulation = QPSK;
+ break;
+ case 1:
+ p->modulation = QAM_16;
+ break;
+ case 2:
+ p->modulation = QAM_64;
+ break;
+ default:
+ printk(KERN_WARNING "Unexpected value for modulation\n");
+ }
+ switch((tmp >> 2) & 7) {
+ 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;
+ default:
+ printk("Unexpected value for hierarchy\n");
+ }
+
+
+ tmp = l64781_readreg (state, 0x1d);
+ p->inversion = (tmp & 0x80) ? INVERSION_ON : INVERSION_OFF;
+
+ tmp = (int) (l64781_readreg (state, 0x08) |
+ (l64781_readreg (state, 0x09) << 8) |
+ (l64781_readreg (state, 0x0a) << 16));
+ p->frequency += tmp;
+
+ return 0;
+}
+
+static int l64781_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+ struct l64781_state* state = fe->demodulator_priv;
+ int sync = l64781_readreg (state, 0x32);
+ int gain = l64781_readreg (state, 0x0e);
+
+ l64781_readreg (state, 0x00); /* clear interrupt registers... */
+ l64781_readreg (state, 0x01); /* dto. */
+
+ *status = 0;
+
+ if (gain > 5)
+ *status |= FE_HAS_SIGNAL;
+
+ if (sync & 0x02) /* VCXO locked, this criteria should be ok */
+ *status |= FE_HAS_CARRIER;
+
+ if (sync & 0x20)
+ *status |= FE_HAS_VITERBI;
+
+ if (sync & 0x40)
+ *status |= FE_HAS_SYNC;
+
+ if (sync == 0x7f)
+ *status |= FE_HAS_LOCK;
+
+ return 0;
+}
+
+static int l64781_read_ber(struct dvb_frontend* fe, u32* ber)
+{
+ struct l64781_state* state = fe->demodulator_priv;
+
+ /* XXX FIXME: set up counting period (reg 0x26...0x28)
+ */
+ *ber = l64781_readreg (state, 0x39)
+ | (l64781_readreg (state, 0x3a) << 8);
+
+ return 0;
+}
+
+static int l64781_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
+{
+ struct l64781_state* state = fe->demodulator_priv;
+
+ u8 gain = l64781_readreg (state, 0x0e);
+ *signal_strength = (gain << 8) | gain;
+
+ return 0;
+}
+
+static int l64781_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+ struct l64781_state* state = fe->demodulator_priv;
+
+ u8 avg_quality = 0xff - l64781_readreg (state, 0x33);
+ *snr = (avg_quality << 8) | avg_quality; /* not exact, but...*/
+
+ return 0;
+}
+
+static int l64781_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
+{
+ struct l64781_state* state = fe->demodulator_priv;
+
+ *ucblocks = l64781_readreg (state, 0x37)
+ | (l64781_readreg (state, 0x38) << 8);
+
+ return 0;
+}
+
+static int l64781_sleep(struct dvb_frontend* fe)
+{
+ struct l64781_state* state = fe->demodulator_priv;
+
+ /* Power down */
+ return l64781_writereg (state, 0x3e, 0x5a);
+}
+
+static int l64781_init(struct dvb_frontend* fe)
+{
+ struct l64781_state* state = fe->demodulator_priv;
+
+ reset_and_configure (state);
+
+ /* Power up */
+ l64781_writereg (state, 0x3e, 0xa5);
+
+ /* Reset hard */
+ l64781_writereg (state, 0x2a, 0x04);
+ l64781_writereg (state, 0x2a, 0x00);
+
+ /* Set tuner specific things */
+ /* AFC_POL, set also in reset_afc */
+ l64781_writereg (state, 0x07, 0x8e);
+
+ /* Use internal ADC */
+ l64781_writereg (state, 0x0b, 0x81);
+
+ /* AGC loop gain, and polarity is positive */
+ l64781_writereg (state, 0x0c, 0x84);
+
+ /* Internal ADC outputs two's complement */
+ l64781_writereg (state, 0x0d, 0x8c);
+
+ /* With ppm=8000, it seems the DTR_SENSITIVITY will result in
+ value of 2 with all possible bandwidths and guard
+ intervals, which is the initial value anyway. */
+ /*l64781_writereg (state, 0x19, 0x92);*/
+
+ /* Everything is two's complement, soft bit and CSI_OUT too */
+ l64781_writereg (state, 0x1e, 0x09);
+
+ /* delay a bit after first init attempt */
+ if (state->first) {
+ state->first = 0;
+ msleep(200);
+ }
+
+ return 0;
+}
+
+static int l64781_get_tune_settings(struct dvb_frontend* fe,
+ struct dvb_frontend_tune_settings* fesettings)
+{
+ fesettings->min_delay_ms = 4000;
+ fesettings->step_size = 0;
+ fesettings->max_drift = 0;
+ return 0;
+}
+
+static void l64781_release(struct dvb_frontend* fe)
+{
+ struct l64781_state* state = fe->demodulator_priv;
+ kfree(state);
+}
+
+static struct dvb_frontend_ops l64781_ops;
+
+struct dvb_frontend* l64781_attach(const struct l64781_config* config,
+ struct i2c_adapter* i2c)
+{
+ struct l64781_state* state = NULL;
+ int reg0x3e = -1;
+ u8 b0 [] = { 0x1a };
+ u8 b1 [] = { 0x00 };
+ struct i2c_msg msg [] = { { .addr = config->demod_address, .flags = 0, .buf = b0, .len = 1 },
+ { .addr = config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
+
+ /* allocate memory for the internal state */
+ state = kzalloc(sizeof(struct l64781_state), GFP_KERNEL);
+ if (state == NULL) goto error;
+
+ /* setup the state */
+ state->config = config;
+ state->i2c = i2c;
+ state->first = 1;
+
+ /**
+ * the L64781 won't show up before we send the reset_and_configure()
+ * broadcast. If nothing responds there is no L64781 on the bus...
+ */
+ if (reset_and_configure(state) < 0) {
+ dprintk("No response to reset and configure broadcast...\n");
+ goto error;
+ }
+
+ /* The chip always responds to reads */
+ if (i2c_transfer(state->i2c, msg, 2) != 2) {
+ dprintk("No response to read on I2C bus\n");
+ goto error;
+ }
+
+ /* Save current register contents for bailout */
+ reg0x3e = l64781_readreg(state, 0x3e);
+
+ /* Reading the POWER_DOWN register always returns 0 */
+ if (reg0x3e != 0) {
+ dprintk("Device doesn't look like L64781\n");
+ goto error;
+ }
+
+ /* Turn the chip off */
+ l64781_writereg (state, 0x3e, 0x5a);
+
+ /* Responds to all reads with 0 */
+ if (l64781_readreg(state, 0x1a) != 0) {
+ dprintk("Read 1 returned unexpcted value\n");
+ goto error;
+ }
+
+ /* Turn the chip on */
+ l64781_writereg (state, 0x3e, 0xa5);
+
+ /* Responds with register default value */
+ if (l64781_readreg(state, 0x1a) != 0xa1) {
+ dprintk("Read 2 returned unexpcted value\n");
+ goto error;
+ }
+
+ /* create dvb_frontend */
+ memcpy(&state->frontend.ops, &l64781_ops, sizeof(struct dvb_frontend_ops));
+ state->frontend.demodulator_priv = state;
+ return &state->frontend;
+
+error:
+ if (reg0x3e >= 0)
+ l64781_writereg (state, 0x3e, reg0x3e); /* restore reg 0x3e */
+ kfree(state);
+ return NULL;
+}
+
+static struct dvb_frontend_ops l64781_ops = {
+ .delsys = { SYS_DVBT },
+ .info = {
+ .name = "LSI L64781 DVB-T",
+ /* .frequency_min = ???,*/
+ /* .frequency_max = ???,*/
+ .frequency_stepsize = 166666,
+ /* .frequency_tolerance = ???,*/
+ /* .symbol_rate_tolerance = ???,*/
+ .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_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
+ FE_CAN_MUTE_TS
+ },
+
+ .release = l64781_release,
+
+ .init = l64781_init,
+ .sleep = l64781_sleep,
+
+ .set_frontend = apply_frontend_param,
+ .get_frontend = get_frontend,
+ .get_tune_settings = l64781_get_tune_settings,
+
+ .read_status = l64781_read_status,
+ .read_ber = l64781_read_ber,
+ .read_signal_strength = l64781_read_signal_strength,
+ .read_snr = l64781_read_snr,
+ .read_ucblocks = l64781_read_ucblocks,
+};
+
+MODULE_DESCRIPTION("LSI L64781 DVB-T Demodulator driver");
+MODULE_AUTHOR("Holger Waechtler, Marko Kohtala");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(l64781_attach);
generated by cgit (git 2.34.1) at 2024-12-22 20:17:49 +0000