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-rw-r--r--drivers/media/radio/lm7000.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/media/radio/lm7000.h b/drivers/media/radio/lm7000.h
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index 000000000..adb217965
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+++ b/drivers/media/radio/lm7000.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LM7000_H
+#define __LM7000_H
+
+/* Sanyo LM7000 tuner chip control
+ *
+ * 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
+ */
+
+#define LM7000_DATA (1 << 0)
+#define LM7000_CLK (1 << 1)
+#define LM7000_CE (1 << 2)
+
+#define LM7000_FM_100 (0 << 20)
+#define LM7000_FM_50 (1 << 20)
+#define LM7000_FM_25 (2 << 20)
+#define LM7000_BIT_FM (1 << 23)
+
+static inline void lm7000_set_freq(u32 freq, void *handle,
+ void (*set_pins)(void *handle, u8 pins))
+{
+ int i;
+ u8 data;
+ u32 val;
+
+ freq += 171200; /* Add 10.7 MHz IF */
+ freq /= 400; /* Convert to 25 kHz units */
+ val = freq | LM7000_FM_25 | LM7000_BIT_FM;
+ /* write the 24-bit register, starting with LSB */
+ for (i = 0; i < 24; i++) {
+ data = val & (1 << i) ? LM7000_DATA : 0;
+ set_pins(handle, data | LM7000_CE);
+ udelay(2);
+ set_pins(handle, data | LM7000_CE | LM7000_CLK);
+ udelay(2);
+ set_pins(handle, data | LM7000_CE);
+ udelay(2);
+ }
+ set_pins(handle, 0);
+}
+
+#endif /* __LM7000_H */