[media] Sony CXD2820R DVB-T/T2/C demodulator driver

It is very first DVB-T2 Linux driver!

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 336 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/cxd2820r_c.c b/drivers/media/dvb/frontends/cxd2820r_c.c
new file mode 100644
index 00000000000..a94bff94472
--- /dev/null
+++ b/drivers/media/dvb/frontends/cxd2820r_c.c
@@ -0,0 +1,336 @@
+/*
+ * Sony CXD2820R demodulator driver
+ *
+ * Copyright (C) 2010 Antti Palosaari <crope@iki.fi>
+ *
+ *    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.,
+ *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+
+static int cxd2820r_set_frontend_c(struct dvb_frontend *fe,
+	struct dvb_frontend_parameters *params)
+{
+	struct cxd2820r_priv *priv = fe->demodulator_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	int ret, i;
+	u8 buf[2];
+	u16 if_ctl;
+	u64 num;
+	struct reg_val_mask tab[] = {
+		{ 0x00080, 0x01, 0xff },
+		{ 0x00081, 0x05, 0xff },
+		{ 0x00085, 0x07, 0xff },
+		{ 0x00088, 0x01, 0xff },
+
+		{ 0x00082, 0x20, 0x60 },
+		{ 0x1016a, 0x48, 0xff },
+		{ 0x100a5, 0x00, 0x01 },
+		{ 0x10020, 0x06, 0x07 },
+		{ 0x10059, 0x50, 0xff },
+		{ 0x10087, 0x0c, 0x3c },
+		{ 0x1008b, 0x07, 0xff },
+		{ 0x1001f, priv->cfg.if_agc_polarity << 7, 0x80 },
+		{ 0x10070, priv->cfg.ts_mode, 0xff },
+	};
+
+	dbg("%s: RF=%d SR=%d", __func__, c->frequency, c->symbol_rate);
+
+	/* update GPIOs */
+	ret = cxd2820r_gpio(fe);
+	if (ret)
+		goto error;
+
+	/* program tuner */
+	if (fe->ops.tuner_ops.set_params)
+		fe->ops.tuner_ops.set_params(fe, params);
+
+	if (priv->delivery_system !=  SYS_DVBC_ANNEX_AC) {
+		for (i = 0; i < ARRAY_SIZE(tab); i++) {
+			ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
+				tab[i].val, tab[i].mask);
+			if (ret)
+				goto error;
+		}
+	}
+
+	priv->delivery_system = SYS_DVBC_ANNEX_AC;
+	priv->ber_running = 0; /* tune stops BER counter */
+
+	num = priv->cfg.if_dvbc;
+	num *= 0x4000;
+	if_ctl = cxd2820r_div_u64_round_closest(num, 41000);
+	buf[0] = (if_ctl >> 8) & 0x3f;
+	buf[1] = (if_ctl >> 0) & 0xff;
+
+	ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
+	if (ret)
+		goto error;
+
+	ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
+	if (ret)
+		goto error;
+
+	ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
+	if (ret)
+		goto error;
+
+	return ret;
+error:
+	dbg("%s: failed:%d", __func__, ret);
+	return ret;
+}
+
+static int cxd2820r_get_frontend_c(struct dvb_frontend *fe,
+	struct dvb_frontend_parameters *p)
+{
+	struct cxd2820r_priv *priv = fe->demodulator_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	int ret;
+	u8 buf[2];
+
+	ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
+	if (ret)
+		goto error;
+
+	c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
+
+	ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
+	if (ret)
+		goto error;
+
+	switch ((buf[0] >> 0) & 0x03) {
+	case 0:
+		c->modulation = QAM_16;
+		break;
+	case 1:
+		c->modulation = QAM_32;
+		break;
+	case 2:
+		c->modulation = QAM_64;
+		break;
+	case 3:
+		c->modulation = QAM_128;
+		break;
+	case 4:
+		c->modulation = QAM_256;
+		break;
+	}
+
+	switch ((buf[0] >> 7) & 0x01) {
+	case 0:
+		c->inversion = INVERSION_OFF;
+		break;
+	case 1:
+		c->inversion = INVERSION_ON;
+		break;
+	}
+
+	return ret;
+error:
+	dbg("%s: failed:%d", __func__, ret);
+	return ret;
+}
+
+static int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
+{
+	struct cxd2820r_priv *priv = fe->demodulator_priv;
+	int ret;
+	u8 buf[3], start_ber = 0;
+	*ber = 0;
+
+	if (priv->ber_running) {
+		ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
+		if (ret)
+			goto error;
+
+		if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
+			*ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
+			start_ber = 1;
+		}
+	} else {
+		priv->ber_running = 1;
+		start_ber = 1;
+	}
+
+	if (start_ber) {
+		/* (re)start BER */
+		ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
+		if (ret)
+			goto error;
+	}
+
+	return ret;
+error:
+	dbg("%s: failed:%d", __func__, ret);
+	return ret;
+}
+
+static int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
+	u16 *strength)
+{
+	struct cxd2820r_priv *priv = fe->demodulator_priv;
+	int ret;
+	u8 buf[2];
+	u16 tmp;
+
+	ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
+	if (ret)
+		goto error;
+
+	tmp = (buf[0] & 0x03) << 8 | buf[1];
+	tmp = (~tmp & 0x03ff);
+
+	if (tmp == 512)
+		/* ~no signal */
+		tmp = 0;
+	else if (tmp > 350)
+		tmp = 350;
+
+	/* scale value to 0x0000-0xffff */
+	*strength = tmp * 0xffff / (350-0);
+
+	return ret;
+error:
+	dbg("%s: failed:%d", __func__, ret);
+	return ret;
+}
+
+static int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
+{
+	struct cxd2820r_priv *priv = fe->demodulator_priv;
+	int ret;
+	u8 tmp;
+	unsigned int A, B;
+	/* report SNR in dB * 10 */
+
+	ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
+	if (ret)
+		goto error;
+
+	if (((tmp >> 0) & 0x03) % 2) {
+		A = 875;
+		B = 650;
+	} else {
+		A = 950;
+		B = 760;
+	}
+
+	ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
+	if (ret)
+		goto error;
+
+	#define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
+	if (tmp)
+		*snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
+			/ 10;
+	else
+		*snr = 0;
+
+	return ret;
+error:
+	dbg("%s: failed:%d", __func__, ret);
+	return ret;
+}
+
+static int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
+{
+	*ucblocks = 0;
+	/* no way to read ? */
+	return 0;
+}
+
+static int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
+{
+	struct cxd2820r_priv *priv = fe->demodulator_priv;
+	int ret;
+	u8 buf[2];
+	*status = 0;
+
+	ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
+	if (ret)
+		goto error;
+
+	if (((buf[0] >> 0) & 0x01) == 1) {
+		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
+			FE_HAS_VITERBI | FE_HAS_SYNC;
+
+		if (((buf[1] >> 3) & 0x01) == 1) {
+			*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
+				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
+		}
+	}
+
+	dbg("%s: lock=%02x %02x", __func__, buf[0], buf[1]);
+
+	return ret;
+error:
+	dbg("%s: failed:%d", __func__, ret);
+	return ret;
+}
+
+static int cxd2820r_init_c(struct dvb_frontend *fe)
+{
+	struct cxd2820r_priv *priv = fe->demodulator_priv;
+	int ret;
+
+	ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
+	if (ret)
+		goto error;
+
+	return ret;
+error:
+	dbg("%s: failed:%d", __func__, ret);
+	return ret;
+}
+
+static int cxd2820r_sleep_c(struct dvb_frontend *fe)
+{
+	struct cxd2820r_priv *priv = fe->demodulator_priv;
+	int ret, i;
+	struct reg_val_mask tab[] = {
+		{ 0x000ff, 0x1f, 0xff },
+		{ 0x00085, 0x00, 0xff },
+		{ 0x00088, 0x01, 0xff },
+		{ 0x00081, 0x00, 0xff },
+		{ 0x00080, 0x00, 0xff },
+	};
+
+	dbg("%s", __func__);
+
+	priv->delivery_system = SYS_UNDEFINED;
+
+	for (i = 0; i < ARRAY_SIZE(tab); i++) {
+		ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
+			tab[i].mask);
+		if (ret)
+			goto error;
+	}
+
+	return ret;
+error:
+	dbg("%s: failed:%d", __func__, ret);
+	return ret;
+}
+
+static int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
+	struct dvb_frontend_tune_settings *s)
+{
+	s->min_delay_ms = 500;
+	s->step_size = 0; /* no zigzag */
+	s->max_drift = 0;
+
+	return 0;
+}
+