1 files changed, 447 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/ves1820.c b/drivers/media/dvb-frontends/ves1820.c
new file mode 100644
index 0000000..bb42b56
--- /dev/null
+++ b/drivers/media/dvb-frontends/ves1820.c
@@ -0,0 +1,447 @@
+/*
+    VES1820  - Single Chip Cable Channel Receiver driver module
+
+    Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@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/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <asm/div64.h>
+
+#include "dvb_frontend.h"
+#include "ves1820.h"
+
+
+
+struct ves1820_state {
+	struct i2c_adapter* i2c;
+	/* configuration settings */
+	const struct ves1820_config* config;
+	struct dvb_frontend frontend;
+
+	/* private demodulator data */
+	u8 reg0;
+	u8 pwm;
+};
+
+
+static int verbose;
+
+static u8 ves1820_inittab[] = {
+	0x69, 0x6A, 0x93, 0x1A, 0x12, 0x46, 0x26, 0x1A,
+	0x43, 0x6A, 0xAA, 0xAA, 0x1E, 0x85, 0x43, 0x20,
+	0xE0, 0x00, 0xA1, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
+	0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x40
+};
+
+static int ves1820_writereg(struct ves1820_state *state, u8 reg, u8 data)
+{
+	u8 buf[] = { 0x00, reg, data };
+	struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 3 };
+	int ret;
+
+	ret = i2c_transfer(state->i2c, &msg, 1);
+
+	if (ret != 1)
+		printk("ves1820: %s(): writereg error (reg == 0x%02x, "
+			"val == 0x%02x, ret == %i)\n", __func__, reg, data, ret);
+
+	return (ret != 1) ? -EREMOTEIO : 0;
+}
+
+static u8 ves1820_readreg(struct ves1820_state *state, u8 reg)
+{
+	u8 b0[] = { 0x00, reg };
+	u8 b1[] = { 0 };
+	struct i2c_msg msg[] = {
+		{.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 2},
+		{.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
+	};
+	int ret;
+
+	ret = i2c_transfer(state->i2c, msg, 2);
+
+	if (ret != 2)
+		printk("ves1820: %s(): readreg error (reg == 0x%02x, "
+		"ret == %i)\n", __func__, reg, ret);
+
+	return b1[0];
+}
+
+static int ves1820_setup_reg0(struct ves1820_state *state, u8 reg0, fe_spectral_inversion_t inversion)
+{
+	reg0 |= state->reg0 & 0x62;
+
+	if (INVERSION_ON == inversion) {
+		if (!state->config->invert) reg0 |= 0x20;
+		else reg0 &= ~0x20;
+	} else if (INVERSION_OFF == inversion) {
+		if (!state->config->invert) reg0 &= ~0x20;
+		else reg0 |= 0x20;
+	}
+
+	ves1820_writereg(state, 0x00, reg0 & 0xfe);
+	ves1820_writereg(state, 0x00, reg0 | 0x01);
+
+	state->reg0 = reg0;
+
+	return 0;
+}
+
+static int ves1820_set_symbolrate(struct ves1820_state *state, u32 symbolrate)
+{
+	s32 BDR;
+	s32 BDRI;
+	s16 SFIL = 0;
+	u16 NDEC = 0;
+	u32 ratio;
+	u32 fin;
+	u32 tmp;
+	u64 fptmp;
+	u64 fpxin;
+
+	if (symbolrate > state->config->xin / 2)
+		symbolrate = state->config->xin / 2;
+
+	if (symbolrate < 500000)
+		symbolrate = 500000;
+
+	if (symbolrate < state->config->xin / 16)
+		NDEC = 1;
+	if (symbolrate < state->config->xin / 32)
+		NDEC = 2;
+	if (symbolrate < state->config->xin / 64)
+		NDEC = 3;
+
+	/* yeuch! */
+	fpxin = state->config->xin * 10;
+	fptmp = fpxin; do_div(fptmp, 123);
+	if (symbolrate < fptmp)
+		SFIL = 1;
+	fptmp = fpxin; do_div(fptmp, 160);
+	if (symbolrate < fptmp)
+		SFIL = 0;
+	fptmp = fpxin; do_div(fptmp, 246);
+	if (symbolrate < fptmp)
+		SFIL = 1;
+	fptmp = fpxin; do_div(fptmp, 320);
+	if (symbolrate < fptmp)
+		SFIL = 0;
+	fptmp = fpxin; do_div(fptmp, 492);
+	if (symbolrate < fptmp)
+		SFIL = 1;
+	fptmp = fpxin; do_div(fptmp, 640);
+	if (symbolrate < fptmp)
+		SFIL = 0;
+	fptmp = fpxin; do_div(fptmp, 984);
+	if (symbolrate < fptmp)
+		SFIL = 1;
+
+	fin = state->config->xin >> 4;
+	symbolrate <<= NDEC;
+	ratio = (symbolrate << 4) / fin;
+	tmp = ((symbolrate << 4) % fin) << 8;
+	ratio = (ratio << 8) + tmp / fin;
+	tmp = (tmp % fin) << 8;
+	ratio = (ratio << 8) + DIV_ROUND_CLOSEST(tmp, fin);
+
+	BDR = ratio;
+	BDRI = (((state->config->xin << 5) / symbolrate) + 1) / 2;
+
+	if (BDRI > 0xFF)
+		BDRI = 0xFF;
+
+	SFIL = (SFIL << 4) | ves1820_inittab[0x0E];
+
+	NDEC = (NDEC << 6) | ves1820_inittab[0x03];
+
+	ves1820_writereg(state, 0x03, NDEC);
+	ves1820_writereg(state, 0x0a, BDR & 0xff);
+	ves1820_writereg(state, 0x0b, (BDR >> 8) & 0xff);
+	ves1820_writereg(state, 0x0c, (BDR >> 16) & 0x3f);
+
+	ves1820_writereg(state, 0x0d, BDRI);
+	ves1820_writereg(state, 0x0e, SFIL);
+
+	return 0;
+}
+
+static int ves1820_init(struct dvb_frontend* fe)
+{
+	struct ves1820_state* state = fe->demodulator_priv;
+	int i;
+
+	ves1820_writereg(state, 0, 0);
+
+	for (i = 0; i < sizeof(ves1820_inittab); i++)
+		ves1820_writereg(state, i, ves1820_inittab[i]);
+	if (state->config->selagc)
+		ves1820_writereg(state, 2, ves1820_inittab[2] | 0x08);
+
+	ves1820_writereg(state, 0x34, state->pwm);
+
+	return 0;
+}
+
+static int ves1820_set_parameters(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct ves1820_state* state = fe->demodulator_priv;
+	static const u8 reg0x00[] = { 0x00, 0x04, 0x08, 0x0c, 0x10 };
+	static const u8 reg0x01[] = { 140, 140, 106, 100, 92 };
+	static const u8 reg0x05[] = { 135, 100, 70, 54, 38 };
+	static const u8 reg0x08[] = { 162, 116, 67, 52, 35 };
+	static const u8 reg0x09[] = { 145, 150, 106, 126, 107 };
+	int real_qam = p->modulation - QAM_16;
+
+	if (real_qam < 0 || real_qam > 4)
+		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);
+	}
+
+	ves1820_set_symbolrate(state, p->symbol_rate);
+	ves1820_writereg(state, 0x34, state->pwm);
+
+	ves1820_writereg(state, 0x01, reg0x01[real_qam]);
+	ves1820_writereg(state, 0x05, reg0x05[real_qam]);
+	ves1820_writereg(state, 0x08, reg0x08[real_qam]);
+	ves1820_writereg(state, 0x09, reg0x09[real_qam]);
+
+	ves1820_setup_reg0(state, reg0x00[real_qam], p->inversion);
+	ves1820_writereg(state, 2, ves1820_inittab[2] | (state->config->selagc ? 0x08 : 0));
+	return 0;
+}
+
+static int ves1820_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+	struct ves1820_state* state = fe->demodulator_priv;
+	int sync;
+
+	*status = 0;
+	sync = ves1820_readreg(state, 0x11);
+
+	if (sync & 1)
+		*status |= FE_HAS_SIGNAL;
+
+	if (sync & 2)
+		*status |= FE_HAS_CARRIER;
+
+	if (sync & 2)	/* XXX FIXME! */
+		*status |= FE_HAS_VITERBI;
+
+	if (sync & 4)
+		*status |= FE_HAS_SYNC;
+
+	if (sync & 8)
+		*status |= FE_HAS_LOCK;
+
+	return 0;
+}
+
+static int ves1820_read_ber(struct dvb_frontend* fe, u32* ber)
+{
+	struct ves1820_state* state = fe->demodulator_priv;
+
+	u32 _ber = ves1820_readreg(state, 0x14) |
+			(ves1820_readreg(state, 0x15) << 8) |
+			((ves1820_readreg(state, 0x16) & 0x0f) << 16);
+	*ber = 10 * _ber;
+
+	return 0;
+}
+
+static int ves1820_read_signal_strength(struct dvb_frontend* fe, u16* strength)
+{
+	struct ves1820_state* state = fe->demodulator_priv;
+
+	u8 gain = ves1820_readreg(state, 0x17);
+	*strength = (gain << 8) | gain;
+
+	return 0;
+}
+
+static int ves1820_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+	struct ves1820_state* state = fe->demodulator_priv;
+
+	u8 quality = ~ves1820_readreg(state, 0x18);
+	*snr = (quality << 8) | quality;
+
+	return 0;
+}
+
+static int ves1820_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
+{
+	struct ves1820_state* state = fe->demodulator_priv;
+
+	*ucblocks = ves1820_readreg(state, 0x13) & 0x7f;
+	if (*ucblocks == 0x7f)
+		*ucblocks = 0xffffffff;
+
+	/* reset uncorrected block counter */
+	ves1820_writereg(state, 0x10, ves1820_inittab[0x10] & 0xdf);
+	ves1820_writereg(state, 0x10, ves1820_inittab[0x10]);
+
+	return 0;
+}
+
+static int ves1820_get_frontend(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct ves1820_state* state = fe->demodulator_priv;
+	int sync;
+	s8 afc = 0;
+
+	sync = ves1820_readreg(state, 0x11);
+	afc = ves1820_readreg(state, 0x19);
+	if (verbose) {
+		/* AFC only valid when carrier has been recovered */
+		printk(sync & 2 ? "ves1820: AFC (%d) %dHz\n" :
+			"ves1820: [AFC (%d) %dHz]\n", afc, -((s32) p->symbol_rate * afc) >> 10);
+	}
+
+	if (!state->config->invert) {
+		p->inversion = (state->reg0 & 0x20) ? INVERSION_ON : INVERSION_OFF;
+	} else {
+		p->inversion = (!(state->reg0 & 0x20)) ? INVERSION_ON : INVERSION_OFF;
+	}
+
+	p->modulation = ((state->reg0 >> 2) & 7) + QAM_16;
+
+	p->fec_inner = FEC_NONE;
+
+	p->frequency = ((p->frequency + 31250) / 62500) * 62500;
+	if (sync & 2)
+		p->frequency -= ((s32) p->symbol_rate * afc) >> 10;
+
+	return 0;
+}
+
+static int ves1820_sleep(struct dvb_frontend* fe)
+{
+	struct ves1820_state* state = fe->demodulator_priv;
+
+	ves1820_writereg(state, 0x1b, 0x02);	/* pdown ADC */
+	ves1820_writereg(state, 0x00, 0x80);	/* standby */
+
+	return 0;
+}
+
+static int ves1820_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
+{
+
+	fesettings->min_delay_ms = 200;
+	fesettings->step_size = 0;
+	fesettings->max_drift = 0;
+	return 0;
+}
+
+static void ves1820_release(struct dvb_frontend* fe)
+{
+	struct ves1820_state* state = fe->demodulator_priv;
+	kfree(state);
+}
+
+static struct dvb_frontend_ops ves1820_ops;
+
+struct dvb_frontend* ves1820_attach(const struct ves1820_config* config,
+				    struct i2c_adapter* i2c,
+				    u8 pwm)
+{
+	struct ves1820_state* state = NULL;
+
+	/* allocate memory for the internal state */
+	state = kzalloc(sizeof(struct ves1820_state), GFP_KERNEL);
+	if (state == NULL)
+		goto error;
+
+	/* setup the state */
+	state->reg0 = ves1820_inittab[0];
+	state->config = config;
+	state->i2c = i2c;
+	state->pwm = pwm;
+
+	/* check if the demod is there */
+	if ((ves1820_readreg(state, 0x1a) & 0xf0) != 0x70)
+		goto error;
+
+	if (verbose)
+		printk("ves1820: pwm=0x%02x\n", state->pwm);
+
+	/* create dvb_frontend */
+	memcpy(&state->frontend.ops, &ves1820_ops, sizeof(struct dvb_frontend_ops));
+	state->frontend.ops.info.symbol_rate_min = (state->config->xin / 2) / 64;      /* SACLK/64 == (XIN/2)/64 */
+	state->frontend.ops.info.symbol_rate_max = (state->config->xin / 2) / 4;       /* SACLK/4 */
+	state->frontend.demodulator_priv = state;
+
+	return &state->frontend;
+
+error:
+	kfree(state);
+	return NULL;
+}
+
+static struct dvb_frontend_ops ves1820_ops = {
+	.delsys = { SYS_DVBC_ANNEX_A },
+	.info = {
+		.name = "VLSI VES1820 DVB-C",
+		.frequency_stepsize = 62500,
+		.frequency_min = 47000000,
+		.frequency_max = 862000000,
+		.caps = FE_CAN_QAM_16 |
+			FE_CAN_QAM_32 |
+			FE_CAN_QAM_64 |
+			FE_CAN_QAM_128 |
+			FE_CAN_QAM_256 |
+			FE_CAN_FEC_AUTO
+	},
+
+	.release = ves1820_release,
+
+	.init = ves1820_init,
+	.sleep = ves1820_sleep,
+
+	.set_frontend = ves1820_set_parameters,
+	.get_frontend = ves1820_get_frontend,
+	.get_tune_settings = ves1820_get_tune_settings,
+
+	.read_status = ves1820_read_status,
+	.read_ber = ves1820_read_ber,
+	.read_signal_strength = ves1820_read_signal_strength,
+	.read_snr = ves1820_read_snr,
+	.read_ucblocks = ves1820_read_ucblocks,
+};
+
+module_param(verbose, int, 0644);
+MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");
+
+MODULE_DESCRIPTION("VLSI VES1820 DVB-C Demodulator driver");
+MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(ves1820_attach);