diff options
Diffstat (limited to 'drivers/media/radio/lm7000.c')
| -rw-r--r-- | drivers/media/radio/lm7000.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/media/radio/lm7000.c b/drivers/media/radio/lm7000.c new file mode 100644 index 00000000000..681f3af8926 --- /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) |