[media] mn88472: Panasonic MN88472 demod driver (DVB-C only)

Only DVB-C mode is supported, DVB-T and DVB-T2 are not supported.
Very much feature reduced version, no signal statistics nor normal
chip configuration options.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/Kconfig

@@ -441,6 +441,13 @@ config DVB_CXD2820R
 	help
 	  Say Y when you want to support this frontend.
 
+config DVB_MN88472
+	tristate "Panasonic MN88472"
+	depends on DVB_CORE && I2C
+	default m if !MEDIA_SUBDRV_AUTOSELECT
+	help
+	  Say Y when you want to support this frontend.
+
 config DVB_RTL2830
 	tristate "Realtek RTL2830 DVB-T"
 	depends on DVB_CORE && I2C

drivers/media/dvb-frontends/Makefile

@@ -15,6 +15,7 @@ stv0900-objs := stv0900_core.o stv0900_sw.o
 drxd-objs := drxd_firm.o drxd_hard.o
 cxd2820r-objs := cxd2820r_core.o cxd2820r_c.o cxd2820r_t.o cxd2820r_t2.o
 drxk-objs := drxk_hard.o
+mn88472-objs := mn88472_c.o
 
 obj-$(CONFIG_DVB_PLL) += dvb-pll.o
 obj-$(CONFIG_DVB_STV0299) += stv0299.o
@@ -103,6 +104,7 @@ obj-$(CONFIG_DVB_MB86A20S) += mb86a20s.o
 obj-$(CONFIG_DVB_IX2505V) += ix2505v.o
 obj-$(CONFIG_DVB_STV0367) += stv0367.o
 obj-$(CONFIG_DVB_CXD2820R) += cxd2820r.o
+obj-$(CONFIG_DVB_MN88472) += mn88472.o
 obj-$(CONFIG_DVB_DRXK) += drxk.o
 obj-$(CONFIG_DVB_TDA18271C2DD) += tda18271c2dd.o
 obj-$(CONFIG_DVB_SI2165) += si2165.o

drivers/media/dvb-frontends/mn88472.h

+/*
+ * Panasonic MN88472 DVB-T/T2/C demodulator driver
+ *
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef MN88472_H
+#define MN88472_H
+
+#include <linux/dvb/frontend.h>
+
+struct mn88472_c_config {
+	/*
+	 * max bytes I2C client could write
+	 * Value must be set.
+	 */
+	int i2c_wr_max;
+};
+
+#if IS_ENABLED(CONFIG_DVB_MN88472)
+extern struct dvb_frontend *mn88472_c_attach(
+	const struct mn88472_c_config *cfg,
+	struct i2c_adapter *i2c
+);
+#else
+static inline struct dvb_frontend *mn88472_c_attach(
+	const struct mn88472_c_config *cfg,
+	struct i2c_adapter *i2c
+)
+{
+	dev_warn(&i2c->dev, "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif
+
+#endif

drivers/media/dvb-frontends/mn88472_c.c

+/*
+ * Panasonic MN88472 DVB-T/T2/C demodulator driver
+ *
+ * Copyright (C) 2013 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.
+ */
+
+#include "mn88472_priv.h"
+
+static struct dvb_frontend_ops mn88472_ops_c;
+
+/* write multiple registers */
+static int mn88472_wregs(struct mn88472_state *s, u16 reg, const u8 *val, int len)
+{
+#define MAX_WR_LEN 21
+#define MAX_WR_XFER_LEN (MAX_WR_LEN + 1)
+	int ret;
+	u8 buf[MAX_WR_XFER_LEN];
+	struct i2c_msg msg[1] = {
+		{
+			.addr = (reg >> 8) & 0xff,
+			.flags = 0,
+			.len = 1 + len,
+			.buf = buf,
+		}
+	};
+
+	if (WARN_ON(len > MAX_WR_LEN))
+		return -EINVAL;
+
+	buf[0] = (reg >> 0) & 0xff;
+	memcpy(&buf[1], val, len);
+
+	ret = i2c_transfer(s->i2c, msg, 1);
+	if (ret == 1) {
+		ret = 0;
+	} else {
+		dev_warn(&s->i2c->dev,
+				"%s: i2c wr failed=%d reg=%02x len=%d\n",
+				KBUILD_MODNAME, ret, reg, len);
+		ret = -EREMOTEIO;
+	}
+
+	return ret;
+}
+
+/* read multiple registers */
+static int mn88472_rregs(struct mn88472_state *s, u16 reg, u8 *val, int len)
+{
+#define MAX_RD_LEN 2
+#define MAX_RD_XFER_LEN (MAX_RD_LEN)
+	int ret;
+	u8 buf[MAX_RD_XFER_LEN];
+	struct i2c_msg msg[2] = {
+		{
+			.addr = (reg >> 8) & 0xff,
+			.flags = 0,
+			.len = 1,
+			.buf = buf,
+		}, {
+			.addr = (reg >> 8) & 0xff,
+			.flags = I2C_M_RD,
+			.len = len,
+			.buf = buf,
+		}
+	};
+
+	if (WARN_ON(len > MAX_RD_LEN))
+		return -EINVAL;
+
+	buf[0] = (reg >> 0) & 0xff;
+
+	ret = i2c_transfer(s->i2c, msg, 2);
+	if (ret == 2) {
+		memcpy(val, buf, len);
+		ret = 0;
+	} else {
+		dev_warn(&s->i2c->dev,
+				"%s: i2c rd failed=%d reg=%02x len=%d\n",
+				KBUILD_MODNAME, ret, reg, len);
+		ret = -EREMOTEIO;
+	}
+
+	return ret;
+}
+
+/* write single register */
+static int mn88472_wreg(struct mn88472_state *s, u16 reg, u8 val)
+{
+	return mn88472_wregs(s, reg, &val, 1);
+}
+
+/* read single register */
+static int mn88472_rreg(struct mn88472_state *s, u16 reg, u8 *val)
+{
+	return mn88472_rregs(s, reg, val, 1);
+}
+
+static int mn88472_set_frontend_c(struct dvb_frontend *fe)
+{
+	struct mn88472_state *s = fe->demodulator_priv;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+	int ret;
+	u32 if_frequency = 0;
+	dev_dbg(&s->i2c->dev,
+			"%s: delivery_system=%d modulation=%d frequency=%d symbol_rate=%d inversion=%d\n",
+			__func__, c->delivery_system, c->modulation,
+			c->frequency, c->symbol_rate, c->inversion);
+
+	if (!s->warm) {
+		ret = -EAGAIN;
+		goto err;
+	}
+
+	/* program tuner */
+	if (fe->ops.tuner_ops.set_params) {
+		ret = fe->ops.tuner_ops.set_params(fe);
+		if (ret)
+			goto err;
+	}
+
+	if (fe->ops.tuner_ops.get_if_frequency) {
+		ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_frequency);
+		if (ret)
+			goto err;
+
+		dev_dbg(&s->i2c->dev, "%s: get_if_frequency=%d\n",
+				__func__, if_frequency);
+	}
+
+	if (if_frequency != 5070000) {
+		dev_err(&s->i2c->dev, "%s: IF frequency %d not supported\n",
+				KBUILD_MODNAME, if_frequency);
+		ret = -EINVAL;
+		goto err;
+	}
+
+	ret = mn88472_wregs(s, 0x1c08, "\x1d", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x18d9, "\xe3", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x1c83, "\x01", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x1c00, "\x66\x00\x01\x04\x00", 5);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x1c10,
+			"\x3f\x50\x2c\x8f\x80\x00\x08\xee\x08\xee", 10);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x1846, "\x00", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x18ae, "\x00", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x18b0, "\x0b", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x18b4, "\x00", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x18cd, "\x17", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x18d4, "\x09", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x18d6, "\x48", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x1a00, "\xb0", 1);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x1cf8, "\x9f", 1);
+	if (ret)
+		goto err;
+
+	s->delivery_system = c->delivery_system;
+
+	return 0;
+err:
+	dev_dbg(&s->i2c->dev, "%s: failed=%d\n", __func__, ret);
+	return ret;
+}
+
+static int mn88472_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
+{
+	struct mn88472_state *s = fe->demodulator_priv;
+	int ret;
+	u8 u8tmp;
+
+	*status = 0;
+
+	if (!s->warm) {
+		ret = -EAGAIN;
+		goto err;
+	}
+
+	ret = mn88472_rreg(s, 0x1a84, &u8tmp);
+	if (ret)
+		goto err;
+
+	if (u8tmp == 0x08)
+		*status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
+				FE_HAS_SYNC | FE_HAS_LOCK;
+
+	return 0;
+err:
+	dev_dbg(&s->i2c->dev, "%s: failed=%d\n", __func__, ret);
+	return ret;
+}
+
+static int mn88472_init_c(struct dvb_frontend *fe)
+{
+	struct mn88472_state *s = fe->demodulator_priv;
+	int ret, len, remaining;
+	const struct firmware *fw = NULL;
+	u8 *fw_file = MN88472_FIRMWARE;
+	dev_dbg(&s->i2c->dev, "%s:\n", __func__);
+
+	/* set cold state by default */
+	s->warm = false;
+
+	/* power on */
+	ret = mn88472_wreg(s, 0x1c05, 0x00);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wregs(s, 0x1c0b, "\x00\x00", 2);
+	if (ret)
+		goto err;
+
+	/* request the firmware, this will block and timeout */
+	ret = request_firmware(&fw, fw_file, s->i2c->dev.parent);
+	if (ret) {
+		dev_err(&s->i2c->dev, "%s: firmare file '%s' not found\n",
+				KBUILD_MODNAME, fw_file);
+		goto err;
+	}
+
+	dev_info(&s->i2c->dev, "%s: downloading firmware from file '%s'\n",
+			KBUILD_MODNAME, fw_file);
+
+	ret = mn88472_wreg(s, 0x18f5, 0x03);
+	if (ret)
+		goto err;
+
+	for (remaining = fw->size; remaining > 0;
+			remaining -= (s->cfg->i2c_wr_max - 1)) {
+		len = remaining;
+		if (len > (s->cfg->i2c_wr_max - 1))
+			len = (s->cfg->i2c_wr_max - 1);
+
+		ret = mn88472_wregs(s, 0x18f6,
+				&fw->data[fw->size - remaining], len);
+		if (ret) {
+			dev_err(&s->i2c->dev,
+					"%s: firmware download failed=%d\n",
+					KBUILD_MODNAME, ret);
+			goto err;
+		}
+	}
+
+	ret = mn88472_wreg(s, 0x18f5, 0x00);
+	if (ret)
+		goto err;
+
+	release_firmware(fw);
+	fw = NULL;
+
+	/* warm state */
+	s->warm = true;
+
+	return 0;
+err:
+	if (fw)
+		release_firmware(fw);
+
+	dev_dbg(&s->i2c->dev, "%s: failed=%d\n", __func__, ret);
+	return ret;
+}
+
+static int mn88472_sleep_c(struct dvb_frontend *fe)
+{
+	struct mn88472_state *s = fe->demodulator_priv;
+	int ret;
+	dev_dbg(&s->i2c->dev, "%s:\n", __func__);
+
+	/* power off */
+	ret = mn88472_wreg(s, 0x1c0b, 0x30);
+	if (ret)
+		goto err;
+
+	ret = mn88472_wreg(s, 0x1c05, 0x3e);
+	if (ret)
+		goto err;
+
+	s->delivery_system = SYS_UNDEFINED;
+
+	return 0;
+err:
+	dev_dbg(&s->i2c->dev, "%s: failed=%d\n", __func__, ret);
+	return ret;
+}
+
+static void mn88472_release_c(struct dvb_frontend *fe)
+{
+	struct mn88472_state *s = fe->demodulator_priv;
+	kfree(s);
+}
+
+struct dvb_frontend *mn88472_attach_c(const struct mn88472_c_config *cfg,
+		struct i2c_adapter *i2c)
+{
+	int ret;
+	struct mn88472_state *s;
+	u8 u8tmp;
+	dev_dbg(&i2c->dev, "%s:\n", __func__);
+
+	/* allocate memory for the internal state */
+	s = kzalloc(sizeof(struct mn88472_state), GFP_KERNEL);
+	if (!s) {
+		ret = -ENOMEM;
+		dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
+		goto err;
+	}
+
+	s->cfg = cfg;
+	s->i2c = i2c;
+
+	/* check demod responds to I2C */
+	ret = mn88472_rreg(s, 0x1c00, &u8tmp);
+	if (ret)
+		goto err;
+
+	/* create dvb_frontend */
+	memcpy(&s->fe.ops, &mn88472_ops_c, sizeof(struct dvb_frontend_ops));
+	s->fe.demodulator_priv = s;
+
+	return &s->fe;
+err:
+	dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
+	kfree(s);
+	return NULL;
+}
+EXPORT_SYMBOL(mn88472_attach_c);
+
+static struct dvb_frontend_ops mn88472_ops_c = {
+	.delsys = {SYS_DVBC_ANNEX_A},
+	.info = {
+		.name = "Panasonic MN88472",
+		.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_32			|
+			FE_CAN_QAM_64			|
+			FE_CAN_QAM_128			|
+			FE_CAN_QAM_256			|
+			FE_CAN_QAM_AUTO			|
+			FE_CAN_TRANSMISSION_MODE_AUTO	|
+			FE_CAN_GUARD_INTERVAL_AUTO	|
+			FE_CAN_HIERARCHY_AUTO		|
+			FE_CAN_MUTE_TS			|
+			FE_CAN_2G_MODULATION		|
+			FE_CAN_MULTISTREAM
+	},
+
+	.release = mn88472_release_c,
+
+	.init = mn88472_init_c,
+	.sleep = mn88472_sleep_c,
+
+	.set_frontend = mn88472_set_frontend_c,
+/*	.get_frontend = mn88472_get_frontend_c, */
+
+	.read_status = mn88472_read_status_c,
+/*	.read_snr = mn88472_read_snr_c, */
+};
+
+MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
+MODULE_DESCRIPTION("Panasonic MN88472 DVB-T/T2/C demodulator driver");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE(MN88472_FIRMWARE);

drivers/media/dvb-frontends/mn88472_priv.h

+/*
+ * Panasonic MN88472 DVB-T/T2/C demodulator driver
+ *
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef MN88472_PRIV_H
+#define MN88472_PRIV_H
+
+#include "dvb_frontend.h"
+#include "mn88472.h"
+#include "dvb_math.h"
+#include <linux/firmware.h>
+#include <linux/i2c-mux.h>
+
+#define MN88472_FIRMWARE "dvb-demod-mn88472-02.fw"
+
+struct mn88472_state {
+	struct i2c_adapter *i2c;
+	const struct mn88472_c_config *cfg;
+	struct dvb_frontend fe;
+	fe_delivery_system_t delivery_system;
+	bool warm; /* FW running */
+};
+
+#endif