1 /* 2 * Copyright (c) 2014 Google, Inc 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <i2c.h> 11 12 static int cur_busnum; 13 14 static int i2c_compat_get_device(uint chip_addr, int alen, 15 struct udevice **devp) 16 { 17 struct dm_i2c_chip *chip; 18 int ret; 19 20 ret = i2c_get_chip_for_busnum(cur_busnum, chip_addr, alen, devp); 21 if (ret) 22 return ret; 23 chip = dev_get_parent_platdata(*devp); 24 if (chip->offset_len != alen) { 25 printf("I2C chip %x: requested alen %d does not match chip offset_len %d\n", 26 chip_addr, alen, chip->offset_len); 27 return -EADDRNOTAVAIL; 28 } 29 30 return 0; 31 } 32 33 int i2c_probe(uint8_t chip_addr) 34 { 35 struct udevice *bus, *dev; 36 int ret; 37 38 ret = uclass_get_device_by_seq(UCLASS_I2C, cur_busnum, &bus); 39 if (ret) { 40 debug("Cannot find I2C bus %d: err=%d\n", cur_busnum, ret); 41 return ret; 42 } 43 44 if (!bus) 45 return -ENOENT; 46 47 return dm_i2c_probe(bus, chip_addr, 0, &dev); 48 } 49 50 int i2c_read(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer, 51 int len) 52 { 53 struct udevice *dev; 54 int ret; 55 56 ret = i2c_compat_get_device(chip_addr, alen, &dev); 57 if (ret) 58 return ret; 59 60 return dm_i2c_read(dev, addr, buffer, len); 61 } 62 63 int i2c_write(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer, 64 int len) 65 { 66 struct udevice *dev; 67 int ret; 68 69 ret = i2c_compat_get_device(chip_addr, alen, &dev); 70 if (ret) 71 return ret; 72 73 return dm_i2c_write(dev, addr, buffer, len); 74 } 75 76 int i2c_get_bus_num_fdt(int node) 77 { 78 struct udevice *bus; 79 int ret; 80 81 ret = uclass_get_device_by_of_offset(UCLASS_I2C, node, &bus); 82 if (ret) 83 return ret; 84 85 return bus->seq; 86 } 87 88 unsigned int i2c_get_bus_num(void) 89 { 90 return cur_busnum; 91 } 92 93 int i2c_set_bus_num(unsigned int bus) 94 { 95 cur_busnum = bus; 96 97 return 0; 98 } 99 100 void i2c_init(int speed, int slaveaddr) 101 { 102 /* Nothing to do here - the init happens through driver model */ 103 } 104 105 void board_i2c_init(const void *blob) 106 { 107 /* Nothing to do here - the init happens through driver model */ 108 } 109