[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>

4 files changed, 88 insertions, 0 deletions

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index c257da13d766..5bcce129d718 100644
--- 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 ca8c7d134b95..7f6aa63117c0 100644
--- 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
index 000000000000..681f3af89260
--- /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
index 000000000000..a5bc7d632f1d
--- /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 */