i2c-uclass-compat.c
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/*
* Copyright (c) 2014 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <i2c.h>
static int cur_busnum __attribute__((section(".data")));
static int i2c_compat_get_device(uint chip_addr, int alen,
struct udevice **devp)
{
struct dm_i2c_chip *chip;
int ret;
ret = i2c_get_chip_for_busnum(cur_busnum, chip_addr, alen, devp);
if (ret)
return ret;
chip = dev_get_parent_platdata(*devp);
if (chip->offset_len != alen) {
printf("I2C chip %x: requested alen %d does not match chip offset_len %d\n",
chip_addr, alen, chip->offset_len);
return -EADDRNOTAVAIL;
}
return 0;
}
int i2c_probe(uint8_t chip_addr)
{
struct udevice *bus, *dev;
int ret;
ret = uclass_get_device_by_seq(UCLASS_I2C, cur_busnum, &bus);
if (ret) {
debug("Cannot find I2C bus %d: err=%d\n", cur_busnum, ret);
return ret;
}
if (!bus)
return -ENOENT;
return dm_i2c_probe(bus, chip_addr, 0, &dev);
}
int i2c_read(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
int len)
{
struct udevice *dev;
int ret;
ret = i2c_compat_get_device(chip_addr, alen, &dev);
if (ret)
return ret;
return dm_i2c_read(dev, addr, buffer, len);
}
int i2c_write(uint8_t chip_addr, unsigned int addr, int alen, uint8_t *buffer,
int len)
{
struct udevice *dev;
int ret;
ret = i2c_compat_get_device(chip_addr, alen, &dev);
if (ret)
return ret;
return dm_i2c_write(dev, addr, buffer, len);
}
int i2c_get_bus_num_fdt(int node)
{
struct udevice *bus;
int ret;
ret = uclass_get_device_by_of_offset(UCLASS_I2C, node, &bus);
if (ret)
return ret;
return bus->seq;
}
unsigned int i2c_get_bus_num(void)
{
return cur_busnum;
}
int i2c_set_bus_num(unsigned int bus)
{
cur_busnum = bus;
return 0;
}
void i2c_init(int speed, int slaveaddr)
{
/* Nothing to do here - the init happens through driver model */
}
void board_i2c_init(const void *blob)
{
/* Nothing to do here - the init happens through driver model */
}
uint8_t i2c_reg_read(uint8_t chip_addr, uint8_t offset)
{
struct udevice *dev;
int ret;
ret = i2c_compat_get_device(chip_addr, 1, &dev);
if (ret)
return 0xff;
return dm_i2c_reg_read(dev, offset);
}
void i2c_reg_write(uint8_t chip_addr, uint8_t offset, uint8_t val)
{
struct udevice *dev;
int ret;
ret = i2c_compat_get_device(chip_addr, 1, &dev);
if (!ret)
dm_i2c_reg_write(dev, offset, val);
}