[media] add a driver for mb86a20s

This adds the trivial bits to mb86a20s. As the driver won't touch
at the channel/layer parameters, this may not be enough for
receiving all channels, especially ISDB-Tsb, but the driver worked
properly for receiving video channels on my tests.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

4 files changed, 644 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/Kconfig b/drivers/media/dvb/frontends/Kconfig
index 00dbf1e488b..ef3e43a0319 100644
--- a/drivers/media/dvb/frontends/Kconfig
+++ b/drivers/media/dvb/frontends/Kconfig
@@ -512,6 +512,14 @@ config DVB_DIB8000
 	  A driver for DiBcom's DiB8000 ISDB-T/ISDB-Tsb demodulator.
 	  Say Y when you want to support this frontend.
 
+config DVB_MB86A20S
+	tristate "Fujitsu mb86a20s"
+	depends on DVB_CORE && I2C
+	default m if DVB_FE_CUSTOMISE
+	help
+	  A driver for Fujitsu mb86a20s ISDB-T/ISDB-Tsb demodulator.
+	  Say Y when you want to support this frontend.
+
 comment "Digital terrestrial only tuners/PLL"
 	depends on DVB_CORE
 
diff --git a/drivers/media/dvb/frontends/Makefile b/drivers/media/dvb/frontends/Makefile
index 48b9fd35671..b1d9525aa7e 100644
--- a/drivers/media/dvb/frontends/Makefile
+++ b/drivers/media/dvb/frontends/Makefile
@@ -81,4 +81,5 @@ obj-$(CONFIG_DVB_ISL6423) += isl6423.o
 obj-$(CONFIG_DVB_EC100) += ec100.o
 obj-$(CONFIG_DVB_DS3000) += ds3000.o
 obj-$(CONFIG_DVB_MB86A16) += mb86a16.o
+obj-$(CONFIG_DVB_MB86A20S) += mb86a20s.o
 obj-$(CONFIG_DVB_IX2505V) += ix2505v.o
diff --git a/drivers/media/dvb/frontends/mb86a20s.c b/drivers/media/dvb/frontends/mb86a20s.c
new file mode 100644
index 00000000000..1e6bec6aa0f
--- /dev/null
+++ b/drivers/media/dvb/frontends/mb86a20s.c
@@ -0,0 +1,584 @@
+/*
+ *   Fujitu mb86a20s ISDB-T/ISDB-Tsb Module driver
+ *
+ *   Copyright (C) 2010 Mauro Carvalho Chehab <mchehab@redhat.com>
+ *   Copyright (C) 2009-2010 Douglas Landgraf <dougsland@redhat.com>
+ *
+ *   FIXME: Need to port to DVB v5.2 API
+ *
+ *   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 version 2.
+ *
+ *   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 <linux/kernel.h>
+#include <asm/div64.h>
+
+#include "dvb_frontend.h"
+#include "mb86a20s.h"
+
+static int debug = 1;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
+
+#define rc(args...)  do {						\
+	printk(KERN_ERR  "mb86a20s: " args);				\
+} while (0)
+
+#define dprintk(args...)						\
+	do {								\
+		if (debug) {						\
+			printk(KERN_DEBUG "mb86a20s: %s: ", __func__);	\
+			printk(args);					\
+		}							\
+	} while (0)
+
+struct mb86a20s_state {
+	struct i2c_adapter *i2c;
+	const struct mb86a20s_config *config;
+
+	struct dvb_frontend frontend;
+
+
+
+
+};
+
+struct regdata {
+	u8 reg;
+	u8 data;
+};
+
+/*
+ * Initialization sequence: Use whatevere default values that PV SBTVD
+ * does on its initialisation, obtained via USB snoop
+ */
+static struct regdata mb86a20s_init[] = {
+	{ 0x70, 0x0f },
+	{ 0x70, 0xff },
+	{ 0x08, 0x01 },
+	{ 0x09, 0x3e },
+	{ 0x50, 0xd1 },
+	{ 0x51, 0x22 },
+	{ 0x39, 0x01 },
+	{ 0x71, 0x00 },
+	{ 0x28, 0x2a },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0xff },
+	{ 0x2b, 0x80 },
+	{ 0x28, 0x20 },
+	{ 0x29, 0x33 },
+	{ 0x2a, 0xdf },
+	{ 0x2b, 0xa9 },
+	{ 0x3b, 0x21 },
+	{ 0x3c, 0x3a },
+	{ 0x01, 0x0d },
+	{ 0x04, 0x08 },
+	{ 0x05, 0x05 },
+	{ 0x04, 0x0e },
+	{ 0x05, 0x00 },
+	{ 0x04, 0x0f },
+	{ 0x05, 0x14 },
+	{ 0x04, 0x0b },
+	{ 0x05, 0x8c },
+	{ 0x04, 0x00 },
+	{ 0x05, 0x00 },
+	{ 0x04, 0x01 },
+	{ 0x05, 0x07 },
+	{ 0x04, 0x02 },
+	{ 0x05, 0x0f },
+	{ 0x04, 0x03 },
+	{ 0x05, 0xa0 },
+	{ 0x04, 0x09 },
+	{ 0x05, 0x00 },
+	{ 0x04, 0x0a },
+	{ 0x05, 0xff },
+	{ 0x04, 0x27 },
+	{ 0x05, 0x64 },
+	{ 0x04, 0x28 },
+	{ 0x05, 0x00 },
+	{ 0x04, 0x1e },
+	{ 0x05, 0xff },
+	{ 0x04, 0x29 },
+	{ 0x05, 0x0a },
+	{ 0x04, 0x32 },
+	{ 0x05, 0x0a },
+	{ 0x04, 0x14 },
+	{ 0x05, 0x02 },
+	{ 0x04, 0x04 },
+	{ 0x05, 0x00 },
+	{ 0x04, 0x05 },
+	{ 0x05, 0x22 },
+	{ 0x04, 0x06 },
+	{ 0x05, 0x0e },
+	{ 0x04, 0x07 },
+	{ 0x05, 0xd8 },
+	{ 0x04, 0x12 },
+	{ 0x05, 0x00 },
+	{ 0x04, 0x13 },
+	{ 0x05, 0xff },
+	{ 0x52, 0x01 },
+	{ 0x50, 0xa7 },
+	{ 0x51, 0x00 },
+	{ 0x50, 0xa8 },
+	{ 0x51, 0xff },
+	{ 0x50, 0xa9 },
+	{ 0x51, 0xff },
+	{ 0x50, 0xaa },
+	{ 0x51, 0x00 },
+	{ 0x50, 0xab },
+	{ 0x51, 0xff },
+	{ 0x50, 0xac },
+	{ 0x51, 0xff },
+	{ 0x50, 0xad },
+	{ 0x51, 0x00 },
+	{ 0x50, 0xae },
+	{ 0x51, 0xff },
+	{ 0x50, 0xaf },
+	{ 0x51, 0xff },
+	{ 0x5e, 0x07 },
+	{ 0x50, 0xdc },
+	{ 0x51, 0x01 },
+	{ 0x50, 0xdd },
+	{ 0x51, 0xf4 },
+	{ 0x50, 0xde },
+	{ 0x51, 0x01 },
+	{ 0x50, 0xdf },
+	{ 0x51, 0xf4 },
+	{ 0x50, 0xe0 },
+	{ 0x51, 0x01 },
+	{ 0x50, 0xe1 },
+	{ 0x51, 0xf4 },
+	{ 0x50, 0xb0 },
+	{ 0x51, 0x07 },
+	{ 0x50, 0xb2 },
+	{ 0x51, 0xff },
+	{ 0x50, 0xb3 },
+	{ 0x51, 0xff },
+	{ 0x50, 0xb4 },
+	{ 0x51, 0xff },
+	{ 0x50, 0xb5 },
+	{ 0x51, 0xff },
+	{ 0x50, 0xb6 },
+	{ 0x51, 0xff },
+	{ 0x50, 0xb7 },
+	{ 0x51, 0xff },
+	{ 0x50, 0x50 },
+	{ 0x51, 0x02 },
+	{ 0x50, 0x51 },
+	{ 0x51, 0x04 },
+	{ 0x45, 0x04 },
+	{ 0x48, 0x04 },
+	{ 0x50, 0xd5 },
+	{ 0x51, 0x01 },
+	{ 0x50, 0xd6 },
+	{ 0x51, 0x1f },
+	{ 0x50, 0xd2 },
+	{ 0x51, 0x03 },
+	{ 0x50, 0xd7 },
+	{ 0x51, 0x3f },
+	{ 0x1c, 0x01 },
+	{ 0x28, 0x06 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x03 },
+	{ 0x28, 0x07 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x0d },
+	{ 0x28, 0x08 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x02 },
+	{ 0x28, 0x09 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x01 },
+	{ 0x28, 0x0a },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x21 },
+	{ 0x28, 0x0b },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x29 },
+	{ 0x28, 0x0c },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x16 },
+	{ 0x28, 0x0d },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x31 },
+	{ 0x28, 0x0e },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x0e },
+	{ 0x28, 0x0f },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x4e },
+	{ 0x28, 0x10 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x46 },
+	{ 0x28, 0x11 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x0f },
+	{ 0x28, 0x12 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x56 },
+	{ 0x28, 0x13 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x35 },
+	{ 0x28, 0x14 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x01 },
+	{ 0x2b, 0xbe },
+	{ 0x28, 0x15 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x01 },
+	{ 0x2b, 0x84 },
+	{ 0x28, 0x16 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x03 },
+	{ 0x2b, 0xee },
+	{ 0x28, 0x17 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x98 },
+	{ 0x28, 0x18 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x00 },
+	{ 0x2b, 0x9f },
+	{ 0x28, 0x19 },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x07 },
+	{ 0x2b, 0xb2 },
+	{ 0x28, 0x1a },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x06 },
+	{ 0x2b, 0xc2 },
+	{ 0x28, 0x1b },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x07 },
+	{ 0x2b, 0x4a },
+	{ 0x28, 0x1c },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x01 },
+	{ 0x2b, 0xbc },
+	{ 0x28, 0x1d },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x04 },
+	{ 0x2b, 0xba },
+	{ 0x28, 0x1e },
+	{ 0x29, 0x00 },
+	{ 0x2a, 0x06 },
+	{ 0x2b, 0x14 },
+	{ 0x50, 0x1e },
+	{ 0x51, 0x5d },
+	{ 0x50, 0x22 },
+	{ 0x51, 0x00 },
+	{ 0x50, 0x23 },
+	{ 0x51, 0xc8 },
+	{ 0x50, 0x24 },
+	{ 0x51, 0x00 },
+	{ 0x50, 0x25 },
+	{ 0x51, 0xf0 },
+	{ 0x50, 0x26 },
+	{ 0x51, 0x00 },
+	{ 0x50, 0x27 },
+	{ 0x51, 0xc3 },
+	{ 0x50, 0x39 },
+	{ 0x51, 0x02 },
+	{ 0x50, 0xd5 },
+	{ 0x51, 0x01 },
+	{ 0xd0, 0x00 },
+};
+
+static struct regdata mb86a20s_reset_reception[] = {
+	{ 0x70, 0xf0 },
+	{ 0x70, 0xff },
+	{ 0x08, 0x01 },
+	{ 0x08, 0x00 },
+};
+
+static int mb86a20s_i2c_writereg(struct mb86a20s_state *state,
+			     u8 i2c_addr, int reg, int data)
+{
+	u8 buf[] = { reg, data };
+	struct i2c_msg msg = {
+		.addr = i2c_addr, .flags = 0, .buf = buf, .len = 2
+	};
+	int rc;
+
+	rc = i2c_transfer(state->i2c, &msg, 1);
+	if (rc != 1) {
+		printk("%s: writereg rcor(rc == %i, reg == 0x%02x,"
+			 " data == 0x%02x)\n", __func__, rc, reg, data);
+		return rc;
+	}
+
+	return 0;
+}
+
+static int mb86a20s_i2c_writeregdata(struct mb86a20s_state *state,
+				     u8 i2c_addr, struct regdata *rd, int size)
+{
+	int i, rc;
+
+	for (i = 0; i < size; i++) {
+		rc = mb86a20s_i2c_writereg(state, i2c_addr, rd[i].reg,
+					   rd[i].data);
+		if (rc < 0)
+			return rc;
+	}
+	return 0;
+}
+
+static int mb86a20s_i2c_readreg(struct mb86a20s_state *state,
+				u8 i2c_addr, u8 reg)
+{
+	u8 val;
+	int rc;
+	struct i2c_msg msg[] = {
+		{ .addr = i2c_addr, .flags = 0, .buf = &reg, .len = 1 },
+		{ .addr = i2c_addr, .flags = I2C_M_RD, .buf = &val, .len = 1 }
+	};
+
+	rc = i2c_transfer(state->i2c, msg, 2);
+
+	if (rc != 2) {
+		rc("%s: reg=0x%x (rcor=%d)\n", __func__, reg, rc);
+		return rc;
+	}
+
+	return val;
+}
+
+#define mb86a20s_readreg(state, reg) \
+	mb86a20s_i2c_readreg(state, state->config->demod_address, reg)
+#define mb86a20s_writereg(state, reg, val) \
+	mb86a20s_i2c_writereg(state, state->config->demod_address, reg, val)
+#define mb86a20s_writeregdata(state, regdata) \
+	mb86a20s_i2c_writeregdata(state, state->config->demod_address, \
+	regdata, ARRAY_SIZE(regdata))
+
+static int mb86a20s_initfe(struct dvb_frontend *fe)
+{
+	struct mb86a20s_state *state = fe->demodulator_priv;
+	int rc;
+
+	dprintk("\n");
+
+	/* Initialize the frontend */
+	rc = mb86a20s_writeregdata(state, mb86a20s_init);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
+static int mb86a20s_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
+{
+	struct mb86a20s_state *state = fe->demodulator_priv;
+	unsigned rf_max, rf_min, rf;
+	u8	 val;
+
+	dprintk("\n");
+
+	/* Does a binary search to get RF strength */
+	rf_max = 0xfff;
+	rf_min = 0;
+	do {
+		rf = (rf_max + rf_min) / 2;
+		mb86a20s_writereg(state, 0x04, 0x1f);
+		mb86a20s_writereg(state, 0x05, rf >> 8);
+		mb86a20s_writereg(state, 0x04, 0x20);
+		mb86a20s_writereg(state, 0x04, rf);
+
+		val = mb86a20s_readreg(state, 0x02);
+		if (val & 0x08)
+			rf_min = (rf_max + rf_min) / 2;
+		else
+			rf_max = (rf_max + rf_min) / 2;
+		if (rf_max - rf_min < 4) {
+			*strength = (((rf_max + rf_min) / 2) * 65535) / 4095;
+			break;
+		}
+	} while (1);
+
+	dprintk("signal strength = %d\n", *strength);
+
+	return 0;
+}
+
+static int mb86a20s_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+	struct mb86a20s_state *state = fe->demodulator_priv;
+	u8 val;
+
+	dprintk("\n");
+	*status = 0;
+
+	val = mb86a20s_readreg(state, 0x0a) & 0xf;
+
+	if (val >= 2)
+		*status |= FE_HAS_SIGNAL;
+
+	if (val >= 4)
+		*status |= FE_HAS_CARRIER;
+
+	if (val >= 5)
+		*status |= FE_HAS_VITERBI;
+
+	if (val >= 7)
+		*status |= FE_HAS_SYNC;
+
+	if (val >= 8)				/* Maybe 9? */
+		*status |= FE_HAS_LOCK;
+
+	dprintk("val = %d, status = 0x%02x\n", val, *status);
+
+	return 0;
+}
+
+static int mb86a20s_set_frontend(struct dvb_frontend *fe,
+	struct dvb_frontend_parameters *p)
+{
+	struct mb86a20s_state *state = fe->demodulator_priv;
+	int rc;
+
+	dprintk("\n");
+
+	fe->ops.tuner_ops.set_params(fe, p);
+	rc = mb86a20s_writeregdata(state, mb86a20s_reset_reception);
+
+	return rc;
+}
+
+static int mb86a20s_get_frontend(struct dvb_frontend *fe,
+	struct dvb_frontend_parameters *p)
+{
+
+	/* FIXME: For now, it does nothing */
+
+	fe->dtv_property_cache.bandwidth_hz = 6000000;
+	fe->dtv_property_cache.transmission_mode = TRANSMISSION_MODE_AUTO;
+	fe->dtv_property_cache.guard_interval = GUARD_INTERVAL_AUTO;
+	fe->dtv_property_cache.isdbt_partial_reception = 0;
+
+	return 0;
+}
+
+static int mb86a20s_tune(struct dvb_frontend *fe,
+			struct dvb_frontend_parameters *params,
+			unsigned int mode_flags,
+			unsigned int *delay,
+			fe_status_t *status)
+{
+	int rc = 0;
+
+	dprintk("\n");
+
+	if (params != NULL)
+		rc = mb86a20s_set_frontend(fe, params);
+
+	if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
+		mb86a20s_read_status(fe, status);
+
+	return rc;
+}
+
+static void mb86a20s_release(struct dvb_frontend *fe)
+{
+	struct mb86a20s_state *state = fe->demodulator_priv;
+
+	dprintk("\n");
+
+	kfree(state);
+}
+
+static struct dvb_frontend_ops mb86a20s_ops;
+
+struct dvb_frontend *mb86a20s_attach(const struct mb86a20s_config *config,
+				    struct i2c_adapter *i2c)
+{
+	u8	rev;
+
+	/* allocate memory for the internal state */
+	struct mb86a20s_state *state =
+		kzalloc(sizeof(struct mb86a20s_state), GFP_KERNEL);
+
+	dprintk("\n");
+	if (state == NULL) {
+		rc("Unable to kzalloc\n");
+		goto error;
+	}
+
+	/* setup the state */
+	state->config = config;
+	state->i2c = i2c;
+
+	/* create dvb_frontend */
+	memcpy(&state->frontend.ops, &mb86a20s_ops,
+		sizeof(struct dvb_frontend_ops));
+	state->frontend.demodulator_priv = state;
+
+	/* Check if it is a mb86a20s frontend */
+	rev = mb86a20s_readreg(state, 0);
+
+	if (rev == 0x13) {
+		printk(KERN_INFO "Detected a Fujitsu mb86a20s frontend\n");
+	} else {
+		printk(KERN_ERR "Frontend revision %d is unknown - aborting.\n",
+		       rev);
+		goto error;
+	}
+
+	return &state->frontend;
+
+error:
+	kfree(state);
+	return NULL;
+}
+EXPORT_SYMBOL(mb86a20s_attach);
+
+static struct dvb_frontend_ops mb86a20s_ops = {
+	/* Use dib8000 values per default */
+	.info = {
+		.name = "Fujitsu mb86A20s",
+		.type = FE_OFDM,
+		.caps = FE_CAN_INVERSION_AUTO | FE_CAN_RECOVER |
+			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_TRANSMISSION_MODE_AUTO | FE_CAN_QAM_AUTO |
+			FE_CAN_GUARD_INTERVAL_AUTO    | FE_CAN_HIERARCHY_AUTO,
+		/* Actually, those values depend on the used tuner */
+		.frequency_min = 45000000,
+		.frequency_max = 864000000,
+		.frequency_stepsize = 62500,
+	},
+
+	.release = mb86a20s_release,
+
+	.init = mb86a20s_initfe,
+	.set_frontend = mb86a20s_set_frontend,
+	.get_frontend = mb86a20s_get_frontend,
+	.read_status = mb86a20s_read_status,
+	.read_signal_strength = mb86a20s_read_signal_strength,
+	.tune = mb86a20s_tune,
+};
+
+MODULE_DESCRIPTION("DVB Frontend module for Fujitsu mb86A20s hardware");
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/dvb/frontends/mb86a20s.h b/drivers/media/dvb/frontends/mb86a20s.h
new file mode 100644
index 00000000000..e3461983a83
--- /dev/null
+++ b/drivers/media/dvb/frontends/mb86a20s.h
@@ -0,0 +1,51 @@
+/*
+ *   Fujitsu mb86a20s driver
+ *
+ *   Copyright (C) 2010 Mauro Carvalho Chehab <mchehab@redhat.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 version 2.
+ *
+ *   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 MB86A20S_H
+#define MB86A20S_H
+
+#include <linux/dvb/frontend.h>
+
+/**
+ * struct mb86a20s_config - Define the per-device attributes of the frontend
+ *
+ * @demod_address:	the demodulator's i2c address
+ */
+
+struct mb86a20s_config {
+	u8 demod_address;
+};
+
+#if defined(CONFIG_DVB_MB86A20S) || (defined(CONFIG_DVB_MB86A20S_MODULE) \
+	&& defined(MODULE))
+extern struct dvb_frontend *mb86a20s_attach(const struct mb86a20s_config *config,
+					   struct i2c_adapter *i2c);
+extern struct i2c_adapter *mb86a20s_get_tuner_i2c_adapter(struct dvb_frontend *);
+#else
+static inline struct dvb_frontend *mb86a20s_attach(
+	const struct mb86a20s_config *config, struct i2c_adapter *i2c)
+{
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+static struct i2c_adapter *
+	mb86a20s_get_tuner_i2c_adapter(struct dvb_frontend *fe)
+{
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif
+
+#endif /* MB86A20S */