mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-26 21:03:44 +09:00
e6f66ec0e7
At present we go through various contortions to store the I2C's chip address in its private data. This only exists when the chip is active so must be set up when it is probed. Until the device is probed we don't actually record what address it will appear on. However, now that we can support per-child platform data, we can use that instead. This allows us to set up the address when the child is bound, and avoid the messy contortions. Unfortunately this is a fairly large change and it seems to be difficult to break it down further. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
99 lines
1.7 KiB
C
99 lines
1.7 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, 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("Requested alen %d does not match chip offset_len %d\n",
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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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