[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: Ondrej Zary <linux@rainbow-software.org>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index c257da13d7663c57cc048d461590b3ce87014bc8..5bcce129d718bd8c344ff787447e8ce903f76a41 100644 (file)
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -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

diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile
index ca8c7d134b95137f6bacf8e0870d95dff828aeaf..7f6aa63117c02ac559f425960e875626c3964a61 100644 (file)
--- a/drivers/media/radio/Makefile
+++ b/drivers/media/radio/Makefile
@@ -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

diff --git a/drivers/media/radio/lm7000.c b/drivers/media/radio/lm7000.c
new file mode 100644 (file)
index 0000000..681f3af
--- /dev/null
+++ b/drivers/media/radio/lm7000.c
@@ -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)

diff --git a/drivers/media/radio/lm7000.h b/drivers/media/radio/lm7000.h
new file mode 100644 (file)
index 0000000..a5bc7d6
--- /dev/null
+++ b/drivers/media/radio/lm7000.h
@@ -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 */