include/linux/leds-expresswire.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Shared library for Kinetic's ExpressWire protocol.
   4  * This protocol works by pulsing the ExpressWire IC's control GPIO.
   5  * ktd2692 and ktd2801 are known to use this protocol.
   6  */
   7
   8 #ifndef _LEDS_EXPRESSWIRE_H
   9 #define _LEDS_EXPRESSWIRE_H
  10
  11 #include <linux/types.h>
  12
  13 struct gpio_desc;
  14
  15 struct expresswire_timing {
  16         unsigned long poweroff_us;
  17         unsigned long detect_delay_us;
  18         unsigned long detect_us;
  19         unsigned long data_start_us;
  20         unsigned long end_of_data_low_us;
  21         unsigned long end_of_data_high_us;
  22         unsigned long short_bitset_us;
  23         unsigned long long_bitset_us;
  24 };
  25
  26 struct expresswire_common_props {
  27         struct gpio_desc *ctrl_gpio;
  28         struct expresswire_timing timing;
  29 };
  30
  31 void expresswire_power_off(struct expresswire_common_props *props);
  32 void expresswire_enable(struct expresswire_common_props *props);
  33 void expresswire_start(struct expresswire_common_props *props);
  34 void expresswire_end(struct expresswire_common_props *props);
  35 void expresswire_set_bit(struct expresswire_common_props *props, bool bit);
  36 void expresswire_write_u8(struct expresswire_common_props *props, u8 val);
  37
  38 #endif /* _LEDS_EXPRESSWIRE_H */