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https://github.com/brain-hackers/u-boot-brain
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c9dffc9719
This patch changes the functioning of the detection of w1 devices. The old way was a comparison between detected w1 and the ones described in the device tree. Now it will just look for the driver matching the family id of the w1 detected. The patch is inspired from Maxime Ripard code. Signed-off-by: Kory Maincent <kory.maincent@bootlin.com> Reviewed-by: Maxime Ripard <maxime@cerno.tech>
87 lines
1.6 KiB
C
87 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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*
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* Copyright (c) 2015 Free Electrons
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* Copyright (c) 2015 NextThing Co.
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* Copyright (c) 2018 Microchip Technology, Inc.
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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* Eugen Hristev <eugen.hristev@microchip.com>
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*
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <w1.h>
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#include <w1-eeprom.h>
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#include <dm/device-internal.h>
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int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
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u8 *buf, unsigned int count)
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{
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const struct w1_eeprom_ops *ops = device_get_ops(dev);
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u64 id = 0;
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int ret;
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if (!ops->read_buf)
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return -ENOSYS;
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ret = w1_eeprom_get_id(dev, &id);
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if (ret)
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return ret;
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if (!id)
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return -ENODEV;
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return ops->read_buf(dev, offset, buf, count);
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}
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int w1_eeprom_get_id(struct udevice *dev, u64 *id)
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{
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struct w1_device *w1 = dev_get_parent_plat(dev);
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if (!w1)
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return -ENODEV;
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*id = w1->id;
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return 0;
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}
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UCLASS_DRIVER(w1_eeprom) = {
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.name = "w1_eeprom",
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.id = UCLASS_W1_EEPROM,
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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.post_bind = dm_scan_fdt_dev,
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#endif
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};
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int w1_eeprom_dm_init(void)
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{
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struct udevice *dev;
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struct uclass *uc;
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int ret;
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ret = uclass_get(UCLASS_W1_EEPROM, &uc);
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if (ret) {
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debug("W1_EEPROM uclass not available\n");
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return ret;
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}
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uclass_foreach_dev(dev, uc) {
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ret = device_probe(dev);
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if (ret == -ENODEV) { /* No such device. */
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debug("W1_EEPROM not available.\n");
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continue;
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}
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if (ret) { /* Other error. */
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printf("W1_EEPROM probe failed, error %d\n", ret);
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continue;
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}
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}
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return 0;
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}
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