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>lime2-spi
parent
e1721ba0e6
commit
c924ee25aa
@ -0,0 +1,17 @@ |
|||||||
|
# |
||||||
|
# EEPROM subsystem configuration |
||||||
|
# |
||||||
|
|
||||||
|
menu "1-wire EEPROM support" |
||||||
|
|
||||||
|
config W1_EEPROM |
||||||
|
bool "Enable support for EEPROMs on 1wire interface" |
||||||
|
depends on DM |
||||||
|
help |
||||||
|
Support for the EEPROMs connected on 1-wire Dallas protocol interface |
||||||
|
|
||||||
|
if W1_EEPROM |
||||||
|
|
||||||
|
endif |
||||||
|
|
||||||
|
endmenu |
@ -0,0 +1,2 @@ |
|||||||
|
obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o
|
||||||
|
|
@ -0,0 +1,116 @@ |
|||||||
|
// SPDX-License-Identifier: GPL-2.0+
|
||||||
|
/*
|
||||||
|
* |
||||||
|
* Copyright (c) 2015 Free Electrons |
||||||
|
* Copyright (c) 2015 NextThing Co. |
||||||
|
* Copyright (c) 2018 Microchip Technology, Inc. |
||||||
|
* |
||||||
|
* Maxime Ripard <maxime.ripard@free-electrons.com> |
||||||
|
* Eugen Hristev <eugen.hristev@microchip.com> |
||||||
|
* |
||||||
|
*/ |
||||||
|
|
||||||
|
#include <common.h> |
||||||
|
#include <dm.h> |
||||||
|
#include <w1.h> |
||||||
|
#include <w1-eeprom.h> |
||||||
|
|
||||||
|
#include <dm/device-internal.h> |
||||||
|
|
||||||
|
int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset, |
||||||
|
u8 *buf, unsigned int count) |
||||||
|
{ |
||||||
|
const struct w1_eeprom_ops *ops = device_get_ops(dev); |
||||||
|
u64 id = 0; |
||||||
|
int ret; |
||||||
|
|
||||||
|
if (!ops->read_buf) |
||||||
|
return -ENOSYS; |
||||||
|
|
||||||
|
ret = w1_eeprom_get_id(dev, &id); |
||||||
|
if (ret) |
||||||
|
return ret; |
||||||
|
if (!id) |
||||||
|
return -ENODEV; |
||||||
|
|
||||||
|
return ops->read_buf(dev, offset, buf, count); |
||||||
|
} |
||||||
|
|
||||||
|
int w1_eeprom_register_new_device(u64 id) |
||||||
|
{ |
||||||
|
u8 family = id & 0xff; |
||||||
|
int ret; |
||||||
|
struct udevice *dev; |
||||||
|
|
||||||
|
for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev); |
||||||
|
!ret && dev; |
||||||
|
uclass_next_device(&dev)) { |
||||||
|
if (ret || !dev) { |
||||||
|
debug("cannot find w1 eeprom dev\n"); |
||||||
|
return ret; |
||||||
|
} |
||||||
|
if (dev_get_driver_data(dev) == family) { |
||||||
|
struct w1_device *w1; |
||||||
|
|
||||||
|
w1 = dev_get_parent_platdata(dev); |
||||||
|
if (w1->id) /* device already in use */ |
||||||
|
continue; |
||||||
|
w1->id = id; |
||||||
|
debug("%s: Match found: %s:%s %llx\n", __func__, |
||||||
|
dev->name, dev->driver->name, id); |
||||||
|
return 0; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
debug("%s: No matches found: error %d\n", __func__, ret); |
||||||
|
|
||||||
|
return ret; |
||||||
|
} |
||||||
|
|
||||||
|
int w1_eeprom_get_id(struct udevice *dev, u64 *id) |
||||||
|
{ |
||||||
|
struct w1_device *w1 = dev_get_parent_platdata(dev); |
||||||
|
|
||||||
|
if (!w1) |
||||||
|
return -ENODEV; |
||||||
|
*id = w1->id; |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
UCLASS_DRIVER(w1_eeprom) = { |
||||||
|
.name = "w1_eeprom", |
||||||
|
.id = UCLASS_W1_EEPROM, |
||||||
|
.flags = DM_UC_FLAG_SEQ_ALIAS, |
||||||
|
#if CONFIG_IS_ENABLED(OF_CONTROL) |
||||||
|
.post_bind = dm_scan_fdt_dev, |
||||||
|
#endif |
||||||
|
}; |
||||||
|
|
||||||
|
int w1_eeprom_dm_init(void) |
||||||
|
{ |
||||||
|
struct udevice *dev; |
||||||
|
struct uclass *uc; |
||||||
|
int ret; |
||||||
|
|
||||||
|
ret = uclass_get(UCLASS_W1_EEPROM, &uc); |
||||||
|
if (ret) { |
||||||
|
debug("W1_EEPROM uclass not available\n"); |
||||||
|
return ret; |
||||||
|
} |
||||||
|
|
||||||
|
uclass_foreach_dev(dev, uc) { |
||||||
|
ret = device_probe(dev); |
||||||
|
if (ret == -ENODEV) { /* No such device. */ |
||||||
|
debug("W1_EEPROM not available.\n"); |
||||||
|
continue; |
||||||
|
} |
||||||
|
|
||||||
|
if (ret) { /* Other error. */ |
||||||
|
printf("W1_EEPROM probe failed, error %d\n", ret); |
||||||
|
continue; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
@ -0,0 +1,33 @@ |
|||||||
|
/* SPDX-License-Identifier: GPL-2.0+
|
||||||
|
* |
||||||
|
* Copyright (c) 2015 Free Electrons |
||||||
|
* Copyright (c) 2015 NextThing Co |
||||||
|
* Copyright (c) 2018 Microchip Technology, Inc. |
||||||
|
* |
||||||
|
*/ |
||||||
|
|
||||||
|
#ifndef __W1_EEPROM_H |
||||||
|
#define __W1_EEPROM_H |
||||||
|
|
||||||
|
struct udevice; |
||||||
|
|
||||||
|
struct w1_eeprom_ops { |
||||||
|
/*
|
||||||
|
* Reads a buff from the given EEPROM memory, starting at |
||||||
|
* given offset and place the results into the given buffer. |
||||||
|
* Should read given count of bytes. |
||||||
|
* Should return 0 on success, and normal error.h on error |
||||||
|
*/ |
||||||
|
int (*read_buf)(struct udevice *dev, unsigned int offset, |
||||||
|
u8 *buf, unsigned int count); |
||||||
|
}; |
||||||
|
|
||||||
|
int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset, |
||||||
|
u8 *buf, unsigned int count); |
||||||
|
|
||||||
|
int w1_eeprom_dm_init(void); |
||||||
|
|
||||||
|
int w1_eeprom_register_new_device(u64 id); |
||||||
|
|
||||||
|
int w1_eeprom_get_id(struct udevice *dev, u64 *id); |
||||||
|
#endif |
Loading…
Reference in new issue