mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 02:38:56 +00:00
a2879764ba
Add the legacy i2c_reg_read/write() functions to the compatibility layer so that they can be used when CONFIG_DM_I2C_COMPAT is defined. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
129 lines
2.3 KiB
C
129 lines
2.3 KiB
C
/*
|
|
* 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;
|
|
|
|
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);
|
|
}
|