From 23fa18eaa71266feff7ba8d83022d9e1cc83c65a Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:42:03 +0000
Subject: [PATCH] disable pwm7
---
kernel/drivers/nvmem/core.c | 729 +++++++++++++++++++++++++++++++++++++++++++++----------
1 files changed, 595 insertions(+), 134 deletions(-)
diff --git a/kernel/drivers/nvmem/core.c b/kernel/drivers/nvmem/core.c
index 9e4ba7a..b9a0326 100644
--- a/kernel/drivers/nvmem/core.c
+++ b/kernel/drivers/nvmem/core.c
@@ -1,17 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* nvmem framework core.
*
* Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
* Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#include <linux/device.h>
@@ -23,10 +15,34 @@
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/nvmem-provider.h>
+#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/slab.h>
-#include "nvmem.h"
+struct nvmem_device {
+ struct module *owner;
+ struct device dev;
+ int stride;
+ int word_size;
+ int id;
+ struct kref refcnt;
+ size_t size;
+ bool read_only;
+ bool root_only;
+ int flags;
+ enum nvmem_type type;
+ struct bin_attribute eeprom;
+ struct device *base_dev;
+ struct list_head cells;
+ nvmem_reg_read_t reg_read;
+ nvmem_reg_write_t reg_write;
+ struct gpio_desc *wp_gpio;
+ void *priv;
+};
+
+#define to_nvmem_device(d) container_of(d, struct nvmem_device, dev)
+
+#define FLAG_COMPAT BIT(0)
struct nvmem_cell {
const char *name;
@@ -45,6 +61,11 @@
static DEFINE_MUTEX(nvmem_cell_mutex);
static LIST_HEAD(nvmem_cell_tables);
+static DEFINE_MUTEX(nvmem_lookup_mutex);
+static LIST_HEAD(nvmem_lookup_list);
+
+static BLOCKING_NOTIFIER_HEAD(nvmem_notifier);
+
static int nvmem_reg_read(struct nvmem_device *nvmem, unsigned int offset,
void *val, size_t bytes)
{
@@ -57,17 +78,253 @@
static int nvmem_reg_write(struct nvmem_device *nvmem, unsigned int offset,
void *val, size_t bytes)
{
- if (nvmem->reg_write)
- return nvmem->reg_write(nvmem->priv, offset, val, bytes);
+ int ret;
+
+ if (nvmem->reg_write) {
+ gpiod_set_value_cansleep(nvmem->wp_gpio, 0);
+ ret = nvmem->reg_write(nvmem->priv, offset, val, bytes);
+ gpiod_set_value_cansleep(nvmem->wp_gpio, 1);
+ return ret;
+ }
return -EINVAL;
}
+
+#ifdef CONFIG_NVMEM_SYSFS
+static const char * const nvmem_type_str[] = {
+ [NVMEM_TYPE_UNKNOWN] = "Unknown",
+ [NVMEM_TYPE_EEPROM] = "EEPROM",
+ [NVMEM_TYPE_OTP] = "OTP",
+ [NVMEM_TYPE_BATTERY_BACKED] = "Battery backed",
+};
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key eeprom_lock_key;
+#endif
+
+static ssize_t type_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvmem_device *nvmem = to_nvmem_device(dev);
+
+ return sprintf(buf, "%s\n", nvmem_type_str[nvmem->type]);
+}
+
+static DEVICE_ATTR_RO(type);
+
+static struct attribute *nvmem_attrs[] = {
+ &dev_attr_type.attr,
+ NULL,
+};
+
+static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr, char *buf,
+ loff_t pos, size_t count)
+{
+ struct device *dev;
+ struct nvmem_device *nvmem;
+ int rc;
+
+ if (attr->private)
+ dev = attr->private;
+ else
+ dev = kobj_to_dev(kobj);
+ nvmem = to_nvmem_device(dev);
+
+ /* Stop the user from reading */
+ if (pos >= nvmem->size)
+ return 0;
+
+ if (!IS_ALIGNED(pos, nvmem->stride))
+ return -EINVAL;
+
+ if (count < nvmem->word_size)
+ return -EINVAL;
+
+ if (pos + count > nvmem->size)
+ count = nvmem->size - pos;
+
+ count = round_down(count, nvmem->word_size);
+
+ if (!nvmem->reg_read)
+ return -EPERM;
+
+ rc = nvmem_reg_read(nvmem, pos, buf, count);
+
+ if (rc)
+ return rc;
+
+ return count;
+}
+
+static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr, char *buf,
+ loff_t pos, size_t count)
+{
+ struct device *dev;
+ struct nvmem_device *nvmem;
+ int rc;
+
+ if (attr->private)
+ dev = attr->private;
+ else
+ dev = kobj_to_dev(kobj);
+ nvmem = to_nvmem_device(dev);
+
+ /* Stop the user from writing */
+ if (pos >= nvmem->size)
+ return -EFBIG;
+
+ if (!IS_ALIGNED(pos, nvmem->stride))
+ return -EINVAL;
+
+ if (count < nvmem->word_size)
+ return -EINVAL;
+
+ if (pos + count > nvmem->size)
+ count = nvmem->size - pos;
+
+ count = round_down(count, nvmem->word_size);
+
+ if (!nvmem->reg_write)
+ return -EPERM;
+
+ rc = nvmem_reg_write(nvmem, pos, buf, count);
+
+ if (rc)
+ return rc;
+
+ return count;
+}
+
+static umode_t nvmem_bin_attr_get_umode(struct nvmem_device *nvmem)
+{
+ umode_t mode = 0400;
+
+ if (!nvmem->root_only)
+ mode |= 0044;
+
+ if (!nvmem->read_only)
+ mode |= 0200;
+
+ if (!nvmem->reg_write)
+ mode &= ~0200;
+
+ if (!nvmem->reg_read)
+ mode &= ~0444;
+
+ return mode;
+}
+
+static umode_t nvmem_bin_attr_is_visible(struct kobject *kobj,
+ struct bin_attribute *attr, int i)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct nvmem_device *nvmem = to_nvmem_device(dev);
+
+ attr->size = nvmem->size;
+
+ return nvmem_bin_attr_get_umode(nvmem);
+}
+
+/* default read/write permissions */
+static struct bin_attribute bin_attr_rw_nvmem = {
+ .attr = {
+ .name = "nvmem",
+ .mode = 0644,
+ },
+ .read = bin_attr_nvmem_read,
+ .write = bin_attr_nvmem_write,
+};
+
+static struct bin_attribute *nvmem_bin_attributes[] = {
+ &bin_attr_rw_nvmem,
+ NULL,
+};
+
+static const struct attribute_group nvmem_bin_group = {
+ .bin_attrs = nvmem_bin_attributes,
+ .attrs = nvmem_attrs,
+ .is_bin_visible = nvmem_bin_attr_is_visible,
+};
+
+static const struct attribute_group *nvmem_dev_groups[] = {
+ &nvmem_bin_group,
+ NULL,
+};
+
+static struct bin_attribute bin_attr_nvmem_eeprom_compat = {
+ .attr = {
+ .name = "eeprom",
+ },
+ .read = bin_attr_nvmem_read,
+ .write = bin_attr_nvmem_write,
+};
+
+/*
+ * nvmem_setup_compat() - Create an additional binary entry in
+ * drivers sys directory, to be backwards compatible with the older
+ * drivers/misc/eeprom drivers.
+ */
+static int nvmem_sysfs_setup_compat(struct nvmem_device *nvmem,
+ const struct nvmem_config *config)
+{
+ int rval;
+
+ if (!config->compat)
+ return 0;
+
+ if (!config->base_dev)
+ return -EINVAL;
+
+ nvmem->eeprom = bin_attr_nvmem_eeprom_compat;
+ nvmem->eeprom.attr.mode = nvmem_bin_attr_get_umode(nvmem);
+ nvmem->eeprom.size = nvmem->size;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ nvmem->eeprom.attr.key = &eeprom_lock_key;
+#endif
+ nvmem->eeprom.private = &nvmem->dev;
+ nvmem->base_dev = config->base_dev;
+
+ rval = device_create_bin_file(nvmem->base_dev, &nvmem->eeprom);
+ if (rval) {
+ dev_err(&nvmem->dev,
+ "Failed to create eeprom binary file %d\n", rval);
+ return rval;
+ }
+
+ nvmem->flags |= FLAG_COMPAT;
+
+ return 0;
+}
+
+static void nvmem_sysfs_remove_compat(struct nvmem_device *nvmem,
+ const struct nvmem_config *config)
+{
+ if (config->compat)
+ device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom);
+}
+
+#else /* CONFIG_NVMEM_SYSFS */
+
+static int nvmem_sysfs_setup_compat(struct nvmem_device *nvmem,
+ const struct nvmem_config *config)
+{
+ return -ENOSYS;
+}
+static void nvmem_sysfs_remove_compat(struct nvmem_device *nvmem,
+ const struct nvmem_config *config)
+{
+}
+
+#endif /* CONFIG_NVMEM_SYSFS */
static void nvmem_release(struct device *dev)
{
struct nvmem_device *nvmem = to_nvmem_device(dev);
- ida_simple_remove(&nvmem_ida, nvmem->id);
+ ida_free(&nvmem_ida, nvmem->id);
+ gpiod_put(nvmem->wp_gpio);
kfree(nvmem);
}
@@ -79,32 +336,14 @@
.name = "nvmem",
};
-static int of_nvmem_match(struct device *dev, void *nvmem_np)
-{
- return dev->of_node == nvmem_np;
-}
-
-static struct nvmem_device *of_nvmem_find(struct device_node *nvmem_np)
-{
- struct device *d;
-
- if (!nvmem_np)
- return NULL;
-
- d = bus_find_device(&nvmem_bus_type, NULL, nvmem_np, of_nvmem_match);
-
- if (!d)
- return NULL;
-
- return to_nvmem_device(d);
-}
-
static void nvmem_cell_drop(struct nvmem_cell *cell)
{
+ blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_REMOVE, cell);
mutex_lock(&nvmem_mutex);
list_del(&cell->node);
mutex_unlock(&nvmem_mutex);
of_node_put(cell->np);
+ kfree_const(cell->name);
kfree(cell);
}
@@ -121,11 +360,12 @@
mutex_lock(&nvmem_mutex);
list_add_tail(&cell->node, &cell->nvmem->cells);
mutex_unlock(&nvmem_mutex);
+ blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_ADD, cell);
}
-static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem,
- const struct nvmem_cell_info *info,
- struct nvmem_cell *cell)
+static int nvmem_cell_info_to_nvmem_cell_nodup(struct nvmem_device *nvmem,
+ const struct nvmem_cell_info *info,
+ struct nvmem_cell *cell)
{
cell->nvmem = nvmem;
cell->offset = info->offset;
@@ -142,9 +382,26 @@
if (!IS_ALIGNED(cell->offset, nvmem->stride)) {
dev_err(&nvmem->dev,
"cell %s unaligned to nvmem stride %d\n",
- cell->name, nvmem->stride);
+ cell->name ?: "<unknown>", nvmem->stride);
return -EINVAL;
}
+
+ return 0;
+}
+
+static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem,
+ const struct nvmem_cell_info *info,
+ struct nvmem_cell *cell)
+{
+ int err;
+
+ err = nvmem_cell_info_to_nvmem_cell_nodup(nvmem, info, cell);
+ if (err)
+ return err;
+
+ cell->name = kstrdup_const(info->name, GFP_KERNEL);
+ if (!cell->name)
+ return -ENOMEM;
return 0;
}
@@ -158,7 +415,7 @@
*
* Return: 0 or negative error code on failure.
*/
-int nvmem_add_cells(struct nvmem_device *nvmem,
+static int nvmem_add_cells(struct nvmem_device *nvmem,
const struct nvmem_cell_info *info,
int ncells)
{
@@ -197,7 +454,32 @@
return rval;
}
-EXPORT_SYMBOL_GPL(nvmem_add_cells);
+
+/**
+ * nvmem_register_notifier() - Register a notifier block for nvmem events.
+ *
+ * @nb: notifier block to be called on nvmem events.
+ *
+ * Return: 0 on success, negative error number on failure.
+ */
+int nvmem_register_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&nvmem_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(nvmem_register_notifier);
+
+/**
+ * nvmem_unregister_notifier() - Unregister a notifier block for nvmem events.
+ *
+ * @nb: notifier block to be unregistered.
+ *
+ * Return: 0 on success, negative error number on failure.
+ */
+int nvmem_unregister_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&nvmem_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(nvmem_unregister_notifier);
static int nvmem_add_cells_from_table(struct nvmem_device *nvmem)
{
@@ -236,6 +518,23 @@
return rval;
}
+static struct nvmem_cell *
+nvmem_find_cell_by_name(struct nvmem_device *nvmem, const char *cell_id)
+{
+ struct nvmem_cell *iter, *cell = NULL;
+
+ mutex_lock(&nvmem_mutex);
+ list_for_each_entry(iter, &nvmem->cells, node) {
+ if (strcmp(cell_id, iter->name) == 0) {
+ cell = iter;
+ break;
+ }
+ }
+ mutex_unlock(&nvmem_mutex);
+
+ return cell;
+}
+
static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
{
struct device_node *parent, *child;
@@ -248,20 +547,24 @@
for_each_child_of_node(parent, child) {
addr = of_get_property(child, "reg", &len);
- if (!addr || (len < 2 * sizeof(u32))) {
+ if (!addr)
+ continue;
+ if (len < 2 * sizeof(u32)) {
dev_err(dev, "nvmem: invalid reg on %pOF\n", child);
+ of_node_put(child);
return -EINVAL;
}
cell = kzalloc(sizeof(*cell), GFP_KERNEL);
- if (!cell)
+ if (!cell) {
+ of_node_put(child);
return -ENOMEM;
+ }
cell->nvmem = nvmem;
- cell->np = of_node_get(child);
cell->offset = be32_to_cpup(addr++);
cell->bytes = be32_to_cpup(addr);
- cell->name = child->name;
+ cell->name = kasprintf(GFP_KERNEL, "%pOFn", child);
addr = of_get_property(child, "bits", &len);
if (addr && len == (2 * sizeof(u32))) {
@@ -278,10 +581,13 @@
dev_err(dev, "cell %s unaligned to nvmem stride %d\n",
cell->name, nvmem->stride);
/* Cells already added will be freed later. */
+ kfree_const(cell->name);
kfree(cell);
+ of_node_put(child);
return -EINVAL;
}
+ cell->np = of_node_get(child);
nvmem_cell_add(cell);
}
@@ -290,7 +596,7 @@
/**
* nvmem_register() - Register a nvmem device for given nvmem_config.
- * Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
+ * Also creates a binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
*
* @config: nvmem device configuration with which nvmem device is created.
*
@@ -306,12 +612,29 @@
if (!config->dev)
return ERR_PTR(-EINVAL);
+ if (!config->reg_read && !config->reg_write)
+ return ERR_PTR(-EINVAL);
+
nvmem = kzalloc(sizeof(*nvmem), GFP_KERNEL);
if (!nvmem)
return ERR_PTR(-ENOMEM);
- rval = ida_simple_get(&nvmem_ida, 0, 0, GFP_KERNEL);
+ rval = ida_alloc(&nvmem_ida, GFP_KERNEL);
if (rval < 0) {
+ kfree(nvmem);
+ return ERR_PTR(rval);
+ }
+
+ nvmem->id = rval;
+
+ if (config->wp_gpio)
+ nvmem->wp_gpio = config->wp_gpio;
+ else
+ nvmem->wp_gpio = gpiod_get_optional(config->dev, "wp",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(nvmem->wp_gpio)) {
+ ida_free(&nvmem_ida, nvmem->id);
+ rval = PTR_ERR(nvmem->wp_gpio);
kfree(nvmem);
return ERR_PTR(rval);
}
@@ -319,7 +642,6 @@
kref_init(&nvmem->refcnt);
INIT_LIST_HEAD(&nvmem->cells);
- nvmem->id = rval;
nvmem->owner = config->owner;
if (!nvmem->owner && config->dev->driver)
nvmem->owner = config->dev->driver->owner;
@@ -329,29 +651,44 @@
nvmem->dev.type = &nvmem_provider_type;
nvmem->dev.bus = &nvmem_bus_type;
nvmem->dev.parent = config->dev;
+ nvmem->root_only = config->root_only;
nvmem->priv = config->priv;
+ nvmem->type = config->type;
nvmem->reg_read = config->reg_read;
nvmem->reg_write = config->reg_write;
- nvmem->dev.of_node = config->dev->of_node;
+ if (!config->no_of_node)
+ nvmem->dev.of_node = config->dev->of_node;
- if (config->id == -1 && config->name) {
- dev_set_name(&nvmem->dev, "%s", config->name);
- } else {
- dev_set_name(&nvmem->dev, "%s%d",
+ switch (config->id) {
+ case NVMEM_DEVID_NONE:
+ rval = dev_set_name(&nvmem->dev, "%s", config->name);
+ break;
+ case NVMEM_DEVID_AUTO:
+ rval = dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
+ break;
+ default:
+ rval = dev_set_name(&nvmem->dev, "%s%d",
config->name ? : "nvmem",
config->name ? config->id : nvmem->id);
+ break;
}
- nvmem->read_only = device_property_present(config->dev, "read-only") |
- config->read_only;
+ if (rval) {
+ ida_free(&nvmem_ida, nvmem->id);
+ kfree(nvmem);
+ return ERR_PTR(rval);
+ }
- nvmem->dev.groups = nvmem_sysfs_get_groups(nvmem, config);
+ nvmem->read_only = device_property_present(config->dev, "read-only") ||
+ config->read_only || !nvmem->reg_write;
- device_initialize(&nvmem->dev);
+#ifdef CONFIG_NVMEM_SYSFS
+ nvmem->dev.groups = nvmem_dev_groups;
+#endif
dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
- rval = device_add(&nvmem->dev);
+ rval = device_register(&nvmem->dev);
if (rval)
goto err_put_device;
@@ -364,7 +701,7 @@
if (config->cells) {
rval = nvmem_add_cells(nvmem, config->cells, config->ncells);
if (rval)
- goto err_teardown_compat;
+ goto err_remove_cells;
}
rval = nvmem_add_cells_from_table(nvmem);
@@ -375,11 +712,12 @@
if (rval)
goto err_remove_cells;
+ blocking_notifier_call_chain(&nvmem_notifier, NVMEM_ADD, nvmem);
+
return nvmem;
err_remove_cells:
nvmem_device_remove_all_cells(nvmem);
-err_teardown_compat:
if (config->compat)
nvmem_sysfs_remove_compat(nvmem, config);
err_device_del:
@@ -397,38 +735,35 @@
nvmem = container_of(kref, struct nvmem_device, refcnt);
+ blocking_notifier_call_chain(&nvmem_notifier, NVMEM_REMOVE, nvmem);
+
if (nvmem->flags & FLAG_COMPAT)
device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom);
nvmem_device_remove_all_cells(nvmem);
- device_del(&nvmem->dev);
- put_device(&nvmem->dev);
+ device_unregister(&nvmem->dev);
}
/**
* nvmem_unregister() - Unregister previously registered nvmem device
*
* @nvmem: Pointer to previously registered nvmem device.
- *
- * Return: Will be an negative on error or a zero on success.
*/
-int nvmem_unregister(struct nvmem_device *nvmem)
+void nvmem_unregister(struct nvmem_device *nvmem)
{
kref_put(&nvmem->refcnt, nvmem_device_release);
-
- return 0;
}
EXPORT_SYMBOL_GPL(nvmem_unregister);
static void devm_nvmem_release(struct device *dev, void *res)
{
- WARN_ON(nvmem_unregister(*(struct nvmem_device **)res));
+ nvmem_unregister(*(struct nvmem_device **)res);
}
/**
* devm_nvmem_register() - Register a managed nvmem device for given
* nvmem_config.
- * Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
+ * Also creates a binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
*
* @dev: Device that uses the nvmem device.
* @config: nvmem device configuration with which nvmem device is created.
@@ -472,7 +807,7 @@
* @dev: Device that uses the nvmem device.
* @nvmem: Pointer to previously registered nvmem device.
*
- * Return: Will be an negative on error or a zero on success.
+ * Return: Will be negative on error or zero on success.
*/
int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
{
@@ -480,18 +815,16 @@
}
EXPORT_SYMBOL(devm_nvmem_unregister);
-
-static struct nvmem_device *__nvmem_device_get(struct device_node *np,
- struct nvmem_cell **cellp,
- const char *cell_id)
+static struct nvmem_device *__nvmem_device_get(void *data,
+ int (*match)(struct device *dev, const void *data))
{
struct nvmem_device *nvmem = NULL;
-
- if (!np)
- return ERR_PTR(-ENOENT);
+ struct device *dev;
mutex_lock(&nvmem_mutex);
- nvmem = of_nvmem_find(np);
+ dev = bus_find_device(&nvmem_bus_type, NULL, data, match);
+ if (dev)
+ nvmem = to_nvmem_device(dev);
mutex_unlock(&nvmem_mutex);
if (!nvmem)
return ERR_PTR(-EPROBE_DEFER);
@@ -499,8 +832,9 @@
if (!try_module_get(nvmem->owner)) {
dev_err(&nvmem->dev,
"could not increase module refcount for cell %s\n",
- nvmem->name);
+ nvmem_dev_name(nvmem));
+ put_device(&nvmem->dev);
return ERR_PTR(-EINVAL);
}
@@ -511,20 +845,9 @@
static void __nvmem_device_put(struct nvmem_device *nvmem)
{
+ put_device(&nvmem->dev);
module_put(nvmem->owner);
kref_put(&nvmem->refcnt, nvmem_device_release);
-}
-
-static struct nvmem_device *nvmem_find(const char *name)
-{
- struct device *d;
-
- d = bus_find_device_by_name(&nvmem_bus_type, NULL, name);
-
- if (!d)
- return ERR_PTR(-ENOENT);
-
- return to_nvmem_device(d);
}
#if IS_ENABLED(CONFIG_OF)
@@ -541,15 +864,19 @@
{
struct device_node *nvmem_np;
- int index;
+ struct nvmem_device *nvmem;
+ int index = 0;
- index = of_property_match_string(np, "nvmem-names", id);
+ if (id)
+ index = of_property_match_string(np, "nvmem-names", id);
nvmem_np = of_parse_phandle(np, "nvmem", index);
if (!nvmem_np)
- return ERR_PTR(-EINVAL);
+ return ERR_PTR(-ENOENT);
- return __nvmem_device_get(nvmem_np, NULL, NULL);
+ nvmem = __nvmem_device_get(nvmem_np, device_match_of_node);
+ of_node_put(nvmem_np);
+ return nvmem;
}
EXPORT_SYMBOL_GPL(of_nvmem_device_get);
#endif
@@ -575,9 +902,25 @@
}
- return nvmem_find(dev_name);
+ return __nvmem_device_get((void *)dev_name, device_match_name);
}
EXPORT_SYMBOL_GPL(nvmem_device_get);
+
+/**
+ * nvmem_device_find() - Find nvmem device with matching function
+ *
+ * @data: Data to pass to match function
+ * @match: Callback function to check device
+ *
+ * Return: ERR_PTR() on error or a valid pointer to a struct nvmem_device
+ * on success.
+ */
+struct nvmem_device *nvmem_device_find(void *data,
+ int (*match)(struct device *dev, const void *data))
+{
+ return __nvmem_device_get(data, match);
+}
+EXPORT_SYMBOL_GPL(nvmem_device_find);
static int devm_nvmem_device_match(struct device *dev, void *res, void *data)
{
@@ -653,15 +996,44 @@
}
EXPORT_SYMBOL_GPL(devm_nvmem_device_get);
-static struct nvmem_cell *nvmem_cell_get_from_list(const char *cell_id)
+static struct nvmem_cell *
+nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
{
- struct nvmem_cell *cell = NULL;
+ struct nvmem_cell *cell = ERR_PTR(-ENOENT);
+ struct nvmem_cell_lookup *lookup;
struct nvmem_device *nvmem;
+ const char *dev_id;
- nvmem = __nvmem_device_get(NULL, &cell, cell_id);
- if (IS_ERR(nvmem))
- return ERR_CAST(nvmem);
+ if (!dev)
+ return ERR_PTR(-EINVAL);
+ dev_id = dev_name(dev);
+
+ mutex_lock(&nvmem_lookup_mutex);
+
+ list_for_each_entry(lookup, &nvmem_lookup_list, node) {
+ if ((strcmp(lookup->dev_id, dev_id) == 0) &&
+ (strcmp(lookup->con_id, con_id) == 0)) {
+ /* This is the right entry. */
+ nvmem = __nvmem_device_get((void *)lookup->nvmem_name,
+ device_match_name);
+ if (IS_ERR(nvmem)) {
+ /* Provider may not be registered yet. */
+ cell = ERR_CAST(nvmem);
+ break;
+ }
+
+ cell = nvmem_find_cell_by_name(nvmem,
+ lookup->cell_name);
+ if (!cell) {
+ __nvmem_device_put(nvmem);
+ cell = ERR_PTR(-ENOENT);
+ }
+ break;
+ }
+ }
+
+ mutex_unlock(&nvmem_lookup_mutex);
return cell;
}
@@ -669,12 +1041,14 @@
static struct nvmem_cell *
nvmem_find_cell_by_node(struct nvmem_device *nvmem, struct device_node *np)
{
- struct nvmem_cell *cell = NULL;
+ struct nvmem_cell *iter, *cell = NULL;
mutex_lock(&nvmem_mutex);
- list_for_each_entry(cell, &nvmem->cells, node) {
- if (np == cell->np)
+ list_for_each_entry(iter, &nvmem->cells, node) {
+ if (np == iter->np) {
+ cell = iter;
break;
+ }
}
mutex_unlock(&nvmem_mutex);
@@ -685,16 +1059,15 @@
* of_nvmem_cell_get() - Get a nvmem cell from given device node and cell id
*
* @np: Device tree node that uses the nvmem cell.
- * @name: nvmem cell name from nvmem-cell-names property, or NULL
- * for the cell at index 0 (the lone cell with no accompanying
- * nvmem-cell-names property).
+ * @id: nvmem cell name from nvmem-cell-names property, or NULL
+ * for the cell at index 0 (the lone cell with no accompanying
+ * nvmem-cell-names property).
*
* Return: Will be an ERR_PTR() on error or a valid pointer
* to a struct nvmem_cell. The nvmem_cell will be freed by the
* nvmem_cell_put().
*/
-struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
- const char *name)
+struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id)
{
struct device_node *cell_np, *nvmem_np;
struct nvmem_device *nvmem;
@@ -702,18 +1075,18 @@
int index = 0;
/* if cell name exists, find index to the name */
- if (name)
- index = of_property_match_string(np, "nvmem-cell-names", name);
+ if (id)
+ index = of_property_match_string(np, "nvmem-cell-names", id);
cell_np = of_parse_phandle(np, "nvmem-cells", index);
if (!cell_np)
- return ERR_PTR(-EINVAL);
+ return ERR_PTR(-ENOENT);
nvmem_np = of_get_next_parent(cell_np);
if (!nvmem_np)
return ERR_PTR(-EINVAL);
- nvmem = __nvmem_device_get(nvmem_np, NULL, NULL);
+ nvmem = __nvmem_device_get(nvmem_np, device_match_of_node);
of_node_put(nvmem_np);
if (IS_ERR(nvmem))
return ERR_CAST(nvmem);
@@ -733,27 +1106,29 @@
* nvmem_cell_get() - Get nvmem cell of device form a given cell name
*
* @dev: Device that requests the nvmem cell.
- * @cell_id: nvmem cell name to get.
+ * @id: nvmem cell name to get (this corresponds with the name from the
+ * nvmem-cell-names property for DT systems and with the con_id from
+ * the lookup entry for non-DT systems).
*
* Return: Will be an ERR_PTR() on error or a valid pointer
* to a struct nvmem_cell. The nvmem_cell will be freed by the
* nvmem_cell_put().
*/
-struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *cell_id)
+struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *id)
{
struct nvmem_cell *cell;
if (dev->of_node) { /* try dt first */
- cell = of_nvmem_cell_get(dev->of_node, cell_id);
+ cell = of_nvmem_cell_get(dev->of_node, id);
if (!IS_ERR(cell) || PTR_ERR(cell) == -EPROBE_DEFER)
return cell;
}
- /* NULL cell_id only allowed for device tree; invalid otherwise */
- if (!cell_id)
+ /* NULL cell id only allowed for device tree; invalid otherwise */
+ if (!id)
return ERR_PTR(-EINVAL);
- return nvmem_cell_get_from_list(cell_id);
+ return nvmem_cell_get_from_lookup(dev, id);
}
EXPORT_SYMBOL_GPL(nvmem_cell_get);
@@ -1010,16 +1385,8 @@
}
EXPORT_SYMBOL_GPL(nvmem_cell_write);
-/**
- * nvmem_cell_read_u32() - Read a cell value as an u32
- *
- * @dev: Device that requests the nvmem cell.
- * @cell_id: Name of nvmem cell to read.
- * @val: pointer to output value.
- *
- * Return: 0 on success or negative errno.
- */
-int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val)
+static int nvmem_cell_read_common(struct device *dev, const char *cell_id,
+ void *val, size_t count)
{
struct nvmem_cell *cell;
void *buf;
@@ -1034,18 +1401,77 @@
nvmem_cell_put(cell);
return PTR_ERR(buf);
}
- if (len != sizeof(*val)) {
+ if (len != count) {
kfree(buf);
nvmem_cell_put(cell);
return -EINVAL;
}
- memcpy(val, buf, sizeof(*val));
-
+ memcpy(val, buf, count);
kfree(buf);
nvmem_cell_put(cell);
+
return 0;
}
+
+/**
+ * nvmem_cell_read_u8() - Read a cell value as a u8
+ *
+ * @dev: Device that requests the nvmem cell.
+ * @cell_id: Name of nvmem cell to read.
+ * @val: pointer to output value.
+ *
+ * Return: 0 on success or negative errno.
+ */
+int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val)
+{
+ return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val));
+}
+EXPORT_SYMBOL_GPL(nvmem_cell_read_u8);
+
+/**
+ * nvmem_cell_read_u16() - Read a cell value as a u16
+ *
+ * @dev: Device that requests the nvmem cell.
+ * @cell_id: Name of nvmem cell to read.
+ * @val: pointer to output value.
+ *
+ * Return: 0 on success or negative errno.
+ */
+int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val)
+{
+ return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val));
+}
+EXPORT_SYMBOL_GPL(nvmem_cell_read_u16);
+
+/**
+ * nvmem_cell_read_u32() - Read a cell value as a u32
+ *
+ * @dev: Device that requests the nvmem cell.
+ * @cell_id: Name of nvmem cell to read.
+ * @val: pointer to output value.
+ *
+ * Return: 0 on success or negative errno.
+ */
+int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val)
+{
+ return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val));
+}
EXPORT_SYMBOL_GPL(nvmem_cell_read_u32);
+
+/**
+ * nvmem_cell_read_u64() - Read a cell value as a u64
+ *
+ * @dev: Device that requests the nvmem cell.
+ * @cell_id: Name of nvmem cell to read.
+ * @val: pointer to output value.
+ *
+ * Return: 0 on success or negative errno.
+ */
+int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val)
+{
+ return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val));
+}
+EXPORT_SYMBOL_GPL(nvmem_cell_read_u64);
/**
* nvmem_device_cell_read() - Read a given nvmem device and cell
@@ -1067,7 +1493,7 @@
if (!nvmem)
return -EINVAL;
- rc = nvmem_cell_info_to_nvmem_cell(nvmem, info, &cell);
+ rc = nvmem_cell_info_to_nvmem_cell_nodup(nvmem, info, &cell);
if (rc)
return rc;
@@ -1087,7 +1513,7 @@
* @buf: buffer to be written to cell.
*
* Return: length of bytes written or negative error code on failure.
- * */
+ */
int nvmem_device_cell_write(struct nvmem_device *nvmem,
struct nvmem_cell_info *info, void *buf)
{
@@ -1097,7 +1523,7 @@
if (!nvmem)
return -EINVAL;
- rc = nvmem_cell_info_to_nvmem_cell(nvmem, info, &cell);
+ rc = nvmem_cell_info_to_nvmem_cell_nodup(nvmem, info, &cell);
if (rc)
return rc;
@@ -1143,7 +1569,7 @@
* @buf: buffer to be written.
*
* Return: length of bytes written or negative error code on failure.
- * */
+ */
int nvmem_device_write(struct nvmem_device *nvmem,
unsigned int offset,
size_t bytes, void *buf)
@@ -1190,6 +1616,41 @@
EXPORT_SYMBOL_GPL(nvmem_del_cell_table);
/**
+ * nvmem_add_cell_lookups() - register a list of cell lookup entries
+ *
+ * @entries: array of cell lookup entries
+ * @nentries: number of cell lookup entries in the array
+ */
+void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries)
+{
+ int i;
+
+ mutex_lock(&nvmem_lookup_mutex);
+ for (i = 0; i < nentries; i++)
+ list_add_tail(&entries[i].node, &nvmem_lookup_list);
+ mutex_unlock(&nvmem_lookup_mutex);
+}
+EXPORT_SYMBOL_GPL(nvmem_add_cell_lookups);
+
+/**
+ * nvmem_del_cell_lookups() - remove a list of previously added cell lookup
+ * entries
+ *
+ * @entries: array of cell lookup entries
+ * @nentries: number of cell lookup entries in the array
+ */
+void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries)
+{
+ int i;
+
+ mutex_lock(&nvmem_lookup_mutex);
+ for (i = 0; i < nentries; i++)
+ list_del(&entries[i].node);
+ mutex_unlock(&nvmem_lookup_mutex);
+}
+EXPORT_SYMBOL_GPL(nvmem_del_cell_lookups);
+
+/**
* nvmem_dev_name() - Get the name of a given nvmem device.
*
* @nvmem: nvmem device.
--
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