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Commit eea85b0a authored by Richard Röjfors's avatar Richard Röjfors Committed by Mauro Carvalho Chehab
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V4L/DVB (13177): radio: Add support for TEF6862 tuner 



This patch adds support for TEF6862 Car Radio Enhanced Selectivity Tuner.

It's implemented as a subdev, supporting checking signal strength
and setting and getting frequency.

Signed-off-by: default avatarRichard Röjfors <richard.rojfors@mocean-labs.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 42752f7a

drivers/media/radio/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -401,4 +401,16 @@ config RADIO_TEA5764_XTAL 
	  Say Y here if TEA5764 have a 32768 Hz crystal in circuit, say N

	  here if TEA5764 reference frequency is connected in FREQIN.



config RADIO_TEF6862

	tristate "TEF6862 Car Radio Enhanced Selectivity Tuner"

	depends on I2C && VIDEO_V4L2

	---help---

	  Say Y here if you want to use the TEF6862 Car Radio Enhanced

	  Selectivity Tuner, found for instance on the Russellville development

	  board. On the russellville the device is connected to internal

	  timberdale I2C bus.



	  To compile this driver as a module, choose M here: the

	  module will be called TEF6862.



endif # RADIO_ADAPTERS

drivers/media/radio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -22,5 +22,6 @@ obj-$(CONFIG_USB_DSBR) += dsbr100.o 
obj-$(CONFIG_RADIO_SI470X) += si470x/

obj-$(CONFIG_USB_MR800) += radio-mr800.o

obj-$(CONFIG_RADIO_TEA5764) += radio-tea5764.o

obj-$(CONFIG_RADIO_TEF6862) += tef6862.o



EXTRA_CFLAGS += -Isound

drivers/media/radio/tef6862.c

0 → 100644
+232 −0
Original line number Diff line number Diff line 
/*

 * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner

 * Copyright (c) 2009 Intel Corporation

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * 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/module.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/interrupt.h>

#include <linux/i2c.h>

#include <linux/i2c-id.h>

#include <media/v4l2-ioctl.h>

#include <media/v4l2-device.h>

#include <media/v4l2-chip-ident.h>



#define DRIVER_NAME "tef6862"



#define FREQ_MUL 16000



#define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)

#define TEF6862_HI_FREQ (108 * FREQ_MUL)



/* Write mode sub addresses */

#define WM_SUB_BANDWIDTH	0x0

#define WM_SUB_PLLM		0x1

#define WM_SUB_PLLL		0x2

#define WM_SUB_DAA		0x3

#define WM_SUB_AGC		0x4

#define WM_SUB_BAND		0x5

#define WM_SUB_CONTROL		0x6

#define WM_SUB_LEVEL		0x7

#define WM_SUB_IFCF		0x8

#define WM_SUB_IFCAP		0x9

#define WM_SUB_ACD		0xA

#define WM_SUB_TEST		0xF



/* Different modes of the MSA register */

#define MODE_BUFFER		0x0

#define MODE_PRESET		0x1

#define MODE_SEARCH		0x2

#define MODE_AF_UPDATE		0x3

#define MODE_JUMP		0x4

#define MODE_CHECK		0x5

#define MODE_LOAD		0x6

#define MODE_END		0x7

#define MODE_SHIFT		5



struct tef6862_state {

	struct v4l2_subdev sd;

	unsigned long freq;

};



static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)

{

	return container_of(sd, struct tef6862_state, sd);

}



static u16 tef6862_sigstr(struct i2c_client *client)

{

	u8 buf[4];

	int err = i2c_master_recv(client, buf, sizeof(buf));

	if (err == sizeof(buf))

		return buf[3] << 8;

	return 0;

}



static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)

{

	if (v->index > 0)

		return -EINVAL;



	/* only support FM for now */

	strlcpy(v->name, "FM", sizeof(v->name));

	v->type = V4L2_TUNER_RADIO;

	v->rangelow = TEF6862_LO_FREQ;

	v->rangehigh = TEF6862_HI_FREQ;

	v->rxsubchans = V4L2_TUNER_SUB_MONO;

	v->capability = V4L2_TUNER_CAP_LOW;

	v->audmode = V4L2_TUNER_MODE_STEREO;

	v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));



	return 0;

}



static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)

{

	return v->index ? -EINVAL : 0;

}



static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)

{

	struct tef6862_state *state = to_state(sd);

	struct i2c_client *client = v4l2_get_subdevdata(sd);

	u16 pll;

	u8 i2cmsg[3];

	int err;



	if (f->tuner != 0)

		return -EINVAL;



	pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL;

	i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM;

	i2cmsg[1] = (pll >> 8) & 0xff;

	i2cmsg[2] = pll & 0xff;



	err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));

	if (!err)

		state->freq = f->frequency;

	return err;

}



static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)

{

	struct tef6862_state *state = to_state(sd);



	if (f->tuner != 0)

		return -EINVAL;

	f->type = V4L2_TUNER_RADIO;

	f->frequency = state->freq;

	return 0;

}



static int tef6862_g_chip_ident(struct v4l2_subdev *sd,

	struct v4l2_dbg_chip_ident *chip)

{

	struct i2c_client *client = v4l2_get_subdevdata(sd);



	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0);

}



static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {

	.g_tuner = tef6862_g_tuner,

	.s_tuner = tef6862_s_tuner,

	.s_frequency = tef6862_s_frequency,

	.g_frequency = tef6862_g_frequency,

};



static const struct v4l2_subdev_core_ops tef6862_core_ops = {

	.g_chip_ident = tef6862_g_chip_ident,

};



static const struct v4l2_subdev_ops tef6862_ops = {

	.core = &tef6862_core_ops,

	.tuner = &tef6862_tuner_ops,

};



/*

 * Generic i2c probe

 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'

 */



static int __devinit tef6862_probe(struct i2c_client *client,

			const struct i2c_device_id *id)

{

	struct tef6862_state *state;

	struct v4l2_subdev *sd;



	/* Check if the adapter supports the needed features */

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return -EIO;



	v4l_info(client, "chip found @ 0x%02x (%s)\n",

			client->addr << 1, client->adapter->name);



	state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL);

	if (state == NULL)

		return -ENOMEM;

	state->freq = TEF6862_LO_FREQ;



	sd = &state->sd;

	v4l2_i2c_subdev_init(sd, client, &tef6862_ops);



	return 0;

}



static int __devexit tef6862_remove(struct i2c_client *client)

{

	struct v4l2_subdev *sd = i2c_get_clientdata(client);



	v4l2_device_unregister_subdev(sd);

	kfree(to_state(sd));

	return 0;

}



static const struct i2c_device_id tef6862_id[] = {

	{DRIVER_NAME, 0},

	{},

};



MODULE_DEVICE_TABLE(i2c, tef6862_id);



static struct i2c_driver tef6862_driver = {

	.driver = {

		.owner	= THIS_MODULE,

		.name	= DRIVER_NAME,

	},

	.probe		= tef6862_probe,

	.remove		= tef6862_remove,

	.id_table	= tef6862_id,

};



static __init int tef6862_init(void)

{

	return i2c_add_driver(&tef6862_driver);

}



static __exit void tef6862_exit(void)

{

	i2c_del_driver(&tef6862_driver);

}



module_init(tef6862_init);

module_exit(tef6862_exit);



MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");

MODULE_AUTHOR("Mocean Laboratories");

MODULE_LICENSE("GPL v2");

include/media/v4l2-chip-ident.h

+3 −0
Original line number Diff line number Diff line
@@ -131,6 +131,9 @@ enum { 
	V4L2_IDENT_SAA6752HS = 6752,

	V4L2_IDENT_SAA6752HS_AC3 = 6753,



	/* modules tef6862: just ident 6862 */

	V4L2_IDENT_TEF6862 = 6862,



	/* module adv7170: just ident 7170 */

	V4L2_IDENT_ADV7170 = 7170,