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c924ee25aa
We might want to access data stored onto one wire EEPROMs. Create a framework to provide a consistent API. Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> [eugen.hristev@microchip.com: reworked patch] Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
117 lines
2.2 KiB
C
117 lines
2.2 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 <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_register_new_device(u64 id)
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{
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u8 family = id & 0xff;
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int ret;
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struct udevice *dev;
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for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev);
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!ret && dev;
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uclass_next_device(&dev)) {
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if (ret || !dev) {
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debug("cannot find w1 eeprom dev\n");
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return ret;
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}
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if (dev_get_driver_data(dev) == family) {
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struct w1_device *w1;
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w1 = dev_get_parent_platdata(dev);
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if (w1->id) /* device already in use */
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continue;
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w1->id = id;
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debug("%s: Match found: %s:%s %llx\n", __func__,
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dev->name, dev->driver->name, id);
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return 0;
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}
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}
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debug("%s: No matches found: error %d\n", __func__, ret);
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return ret;
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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_platdata(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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