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