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 11 struct 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 18 struct 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 35 struct w1_device { 36 u64 id; 37 }; 38 39 struct 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 46 int w1_get_bus(int busnum, struct udevice **busp); 47 u8 w1_get_device_family(struct udevice *dev); 48 49 int w1_read_buf(struct udevice *dev, u8 *buf, unsigned int count); 50 int w1_read_byte(struct udevice *dev); 51 int w1_reset_select(struct udevice *dev); 52 int w1_write_buf(struct udevice *dev, u8 *buf, unsigned int count); 53 int w1_write_byte(struct udevice *dev, u8 byte); 54 55 #endif 56