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[media] radio: Add Sanyo LM7000 tuner driver

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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: Ondrej Zary <linux@rainbow-software.org>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Ondrej Zary 2012-06-12 14:37:54 -03:00 committed by Mauro Carvalho Chehab
parent 61bdbef063
commit 4ecbb69414
4 changed files with 88 additions and 0 deletions
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3
drivers/media/radio/Kconfig
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@ -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

1
drivers/media/radio/Makefile
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@ -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

52
drivers/media/radio/lm7000.c Normal file
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@ -0,0 +1,52 @@
/* 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)

32
drivers/media/radio/lm7000.h Normal file
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@ -0,0 +1,32 @@
#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 */