LXR uboot/include/w1.h

   1/* SPDX-License-Identifier:     GPL-2.0+
   2 *
   3 * Copyright (c) 2015 Free Electrons
   4 * Copyright (c) 2015 NextThing Co
   5 *
   6 */
   7
   8#ifndef __W1_H
   9#define __W1_H
  10
  11struct udevice;
  12
  13#define W1_FAMILY_DS24B33       0x23
  14#define W1_FAMILY_DS2431        0x2d
  15#define W1_FAMILY_DS2502        0x09
  16#define W1_FAMILY_EEP_SANDBOX   0xfe
  17
  18struct w1_driver_entry {
  19        struct driver   *driver;
  20        u8              *family;
  21};
  22
  23/* U_BOOT_W1_DEVICE() tells U-Boot to create a one-wire device.
  24 *
  25 * @__name: Device name (C identifier, not a string. E.g. gpio7_at_ff7e0000)
  26 * @__driver: Driver name (C identifier, not a string. E.g. gpio7_at_ff7e0000)
  27 * @__family: Family code number of the one-wire
  28 */
  29#define U_BOOT_W1_DEVICE(__name, __family)                              \
  30        ll_entry_declare(struct w1_driver_entry, __name, w1_driver_entry) = { \
  31                .driver = llsym(struct driver, __name, driver),         \
  32                .family = __family,                                     \
  33        }
  34
  35struct w1_device {
  36        u64     id;
  37};
  38
  39struct w1_ops {
  40        u8      (*read_byte)(struct udevice *dev);
  41        bool    (*reset)(struct udevice *dev);
  42        u8      (*triplet)(struct udevice *dev, bool bdir);
  43        void    (*write_byte)(struct udevice *dev, u8 byte);
  44};
  45
  46int w1_get_bus(int busnum, struct udevice **busp);
  47u8 w1_get_device_family(struct udevice *dev);
  48
  49int w1_read_buf(struct udevice *dev, u8 *buf, unsigned int count);
  50int w1_read_byte(struct udevice *dev);
  51int w1_reset_select(struct udevice *dev);
  52int w1_write_buf(struct udevice *dev, u8 *buf, unsigned int count);
  53int w1_write_byte(struct udevice *dev, u8 byte);
  54
  55#endif
  56