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Commit 4ecbb694 authored by Ondrej Zary's avatar Ondrej Zary Committed by Mauro Carvalho Chehab
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[media] radio: Add Sanyo LM7000 tuner driver 



Add very simple driver for Sanyo LM7000 AM/FM tuner chip. Only FM is supported
as there is no known HW with AM implemented.

This will be used by radio-aimslab and radio-sf16fmi.

Signed-off-by: default avatarOndrej Zary <linux@rainbow-software.org>
Acked-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 61bdbef0

drivers/media/radio/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -191,6 +191,9 @@ config RADIO_CADET 
	  To compile this driver as a module, choose M here: the

	  module will be called radio-cadet.



config RADIO_LM7000

	tristate



config RADIO_RTRACK

	tristate "AIMSlab RadioTrack (aka RadioReveal) support"

	depends on ISA && VIDEO_V4L2

drivers/media/radio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -28,5 +28,6 @@ obj-$(CONFIG_RADIO_TEF6862) += tef6862.o 
obj-$(CONFIG_RADIO_TIMBERDALE) += radio-timb.o

obj-$(CONFIG_RADIO_WL1273) += radio-wl1273.o

obj-$(CONFIG_RADIO_WL128X) += wl128x/

obj-$(CONFIG_RADIO_LM7000) += lm7000.o



ccflags-y += -Isound

drivers/media/radio/lm7000.c

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+52 −0
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/* Sanyo LM7000 tuner chip driver

 *

 * Copyright 2012 Ondrej Zary <linux@rainbow-software.org>

 * based on radio-aimslab.c by M. Kirkwood

 * and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec

 */



#include <linux/delay.h>

#include <linux/module.h>

#include "lm7000.h"



MODULE_AUTHOR("Ondrej Zary <linux@rainbow-software.org>");

MODULE_DESCRIPTION("Routines for Sanyo LM7000 AM/FM radio tuner chip");

MODULE_LICENSE("GPL");



/* write the 24-bit register, starting with LSB */

static void lm7000_write(struct lm7000 *lm, u32 val)

{

	int i;

	u8 data;



	for (i = 0; i < 24; i++) {

		data = val & (1 << i) ? LM7000_DATA : 0;

		lm->set_pins(lm, data | LM7000_CE);

		udelay(2);

		lm->set_pins(lm, data | LM7000_CE | LM7000_CLK);

		udelay(2);

		lm->set_pins(lm, data | LM7000_CE);

		udelay(2);

	}

	lm->set_pins(lm, 0);

}



void lm7000_set_freq(struct lm7000 *lm, u32 freq)

{

	freq += 171200;		/* Add 10.7 MHz IF */

	freq /= 400;		/* Convert to 25 kHz units */

	lm7000_write(lm, freq | LM7000_FM_25 | LM7000_BIT_FM);

}

EXPORT_SYMBOL(lm7000_set_freq);



static int __init lm7000_module_init(void)

{

	return 0;

}



static void __exit lm7000_module_exit(void)

{

}



module_init(lm7000_module_init)

module_exit(lm7000_module_exit)

drivers/media/radio/lm7000.h

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#ifndef __LM7000_H

#define __LM7000_H



#define LM7000_DATA	(1 << 0)

#define LM7000_CLK	(1 << 1)

#define LM7000_CE	(1 << 2)



#define LM7000_FREQ_MASK 0x3fff

#define LM7000_BIT_T0	(1 << 14)

#define LM7000_BIT_T1	(1 << 15)

#define LM7000_BIT_B0	(1 << 16)

#define LM7000_BIT_B1	(1 << 17)

#define LM7000_BIT_B2	(1 << 18)

#define LM7000_BIT_TB	(1 << 19)

#define LM7000_FM_100	(0 << 20)

#define LM7000_FM_50	(1 << 20)

#define LM7000_FM_25	(2 << 20)

#define LM7000_AM_5	(3 << 20)

#define LM7000_AM_10	(4 << 20)

#define LM7000_AM_9	(5 << 20)

#define LM7000_AM_1	(6 << 20)

#define LM7000_AM_5_	(7 << 20)

#define LM7000_BIT_FM	(1 << 23)





struct lm7000 {

	void (*set_pins)(struct lm7000 *lm, u8 pins);

};



void lm7000_set_freq(struct lm7000 *lm, u32 freq);



#endif /* __LM7000_H */