173845350SSimon Glass /* 273845350SSimon Glass * Copyright (c) 2014 Google, Inc 373845350SSimon Glass * 473845350SSimon Glass * SPDX-License-Identifier: GPL-2.0+ 573845350SSimon Glass */ 673845350SSimon Glass 773845350SSimon Glass #include <common.h> 873845350SSimon Glass #include <dm.h> 973845350SSimon Glass #include <errno.h> 1073845350SSimon Glass #include <i2c.h> 1173845350SSimon Glass 1273845350SSimon Glass static int cur_busnum; 1373845350SSimon Glass 1473845350SSimon Glass static int i2c_compat_get_device(uint chip_addr, int alen, 1573845350SSimon Glass struct udevice **devp) 1673845350SSimon Glass { 1773845350SSimon Glass struct dm_i2c_chip *chip; 1873845350SSimon Glass int ret; 1973845350SSimon Glass 2018a7f6aaSPrzemyslaw Marczak ret = i2c_get_chip_for_busnum(cur_busnum, chip_addr, alen, devp); 2173845350SSimon Glass if (ret) 2273845350SSimon Glass return ret; 23e6f66ec0SSimon Glass chip = dev_get_parent_platdata(*devp); 2473845350SSimon Glass if (chip->offset_len != alen) { 25*d744d561SSimon Glass printf("I2C chip %x: requested alen %d does not match chip offset_len %d\n", 26*d744d561SSimon Glass chip_addr, alen, chip->offset_len); 2773845350SSimon Glass return -EADDRNOTAVAIL; 2873845350SSimon Glass } 2973845350SSimon Glass 3073845350SSimon Glass return 0; 3173845350SSimon Glass } 3273845350SSimon Glass 3373845350SSimon Glass int i2c_probe(uint8_t chip_addr) 3473845350SSimon Glass { 3573845350SSimon Glass struct udevice *bus, *dev; 3673845350SSimon Glass int ret; 3773845350SSimon Glass 3873845350SSimon Glass ret = uclass_get_device_by_seq(UCLASS_I2C, cur_busnum, &bus); 3973845350SSimon Glass if (ret) { 4073845350SSimon Glass debug("Cannot find I2C bus %d: err=%d\n", cur_busnum, ret); 4173845350SSimon Glass return ret; 4273845350SSimon Glass } 4373845350SSimon Glass 4473845350SSimon Glass if (!bus) 4573845350SSimon Glass return -ENOENT; 4673845350SSimon Glass 4773845350SSimon Glass return dm_i2c_probe(bus, chip_addr, 0, &dev); 4873845350SSimon Glass } 4973845350SSimon Glass 5073845350SSimon Glass int i2c_read(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer, 5173845350SSimon Glass int len) 5273845350SSimon Glass { 5373845350SSimon Glass struct udevice *dev; 5473845350SSimon Glass int ret; 5573845350SSimon Glass 5673845350SSimon Glass ret = i2c_compat_get_device(chip_addr, alen, &dev); 5773845350SSimon Glass if (ret) 5873845350SSimon Glass return ret; 5973845350SSimon Glass 6073845350SSimon Glass return dm_i2c_read(dev, addr, buffer, len); 6173845350SSimon Glass } 6273845350SSimon Glass 6373845350SSimon Glass int i2c_write(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer, 6473845350SSimon Glass int len) 6573845350SSimon Glass { 6673845350SSimon Glass struct udevice *dev; 6773845350SSimon Glass int ret; 6873845350SSimon Glass 6973845350SSimon Glass ret = i2c_compat_get_device(chip_addr, alen, &dev); 7073845350SSimon Glass if (ret) 7173845350SSimon Glass return ret; 7273845350SSimon Glass 7373845350SSimon Glass return dm_i2c_write(dev, addr, buffer, len); 7473845350SSimon Glass } 7573845350SSimon Glass 7673845350SSimon Glass int i2c_get_bus_num_fdt(int node) 7773845350SSimon Glass { 7873845350SSimon Glass struct udevice *bus; 7973845350SSimon Glass int ret; 8073845350SSimon Glass 8173845350SSimon Glass ret = uclass_get_device_by_of_offset(UCLASS_I2C, node, &bus); 8273845350SSimon Glass if (ret) 8373845350SSimon Glass return ret; 8473845350SSimon Glass 8573845350SSimon Glass return bus->seq; 8673845350SSimon Glass } 8773845350SSimon Glass 8873845350SSimon Glass unsigned int i2c_get_bus_num(void) 8973845350SSimon Glass { 9073845350SSimon Glass return cur_busnum; 9173845350SSimon Glass } 9273845350SSimon Glass 9373845350SSimon Glass int i2c_set_bus_num(unsigned int bus) 9473845350SSimon Glass { 9573845350SSimon Glass cur_busnum = bus; 9673845350SSimon Glass 9773845350SSimon Glass return 0; 9873845350SSimon Glass } 99*d744d561SSimon Glass 100*d744d561SSimon Glass void i2c_init(int speed, int slaveaddr) 101*d744d561SSimon Glass { 102*d744d561SSimon Glass /* Nothing to do here - the init happens through driver model */ 103*d744d561SSimon Glass } 104*d744d561SSimon Glass 105*d744d561SSimon Glass void board_i2c_init(const void *blob) 106*d744d561SSimon Glass { 107*d744d561SSimon Glass /* Nothing to do here - the init happens through driver model */ 108*d744d561SSimon Glass } 109