4ecbb69414
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>
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
/* Sanyo LM7000 tuner chip driver
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*
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* Copyright 2012 Ondrej Zary <linux@rainbow-software.org>
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* based on radio-aimslab.c by M. Kirkwood
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* and radio-sf16fmi.c by M. Kirkwood and Petr Vandrovec
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include "lm7000.h"
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MODULE_AUTHOR("Ondrej Zary <linux@rainbow-software.org>");
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MODULE_DESCRIPTION("Routines for Sanyo LM7000 AM/FM radio tuner chip");
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MODULE_LICENSE("GPL");
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/* write the 24-bit register, starting with LSB */
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static void lm7000_write(struct lm7000 *lm, u32 val)
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{
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int i;
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u8 data;
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for (i = 0; i < 24; i++) {
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data = val & (1 << i) ? LM7000_DATA : 0;
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lm->set_pins(lm, data | LM7000_CE);
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udelay(2);
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lm->set_pins(lm, data | LM7000_CE | LM7000_CLK);
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udelay(2);
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lm->set_pins(lm, data | LM7000_CE);
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udelay(2);
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}
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lm->set_pins(lm, 0);
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}
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void lm7000_set_freq(struct lm7000 *lm, u32 freq)
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{
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freq += 171200; /* Add 10.7 MHz IF */
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freq /= 400; /* Convert to 25 kHz units */
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lm7000_write(lm, freq | LM7000_FM_25 | LM7000_BIT_FM);
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}
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EXPORT_SYMBOL(lm7000_set_freq);
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static int __init lm7000_module_init(void)
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{
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return 0;
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}
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static void __exit lm7000_module_exit(void)
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{
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}
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module_init(lm7000_module_init)
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module_exit(lm7000_module_exit)
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