diff options
Diffstat (limited to 'drivers/nvmem/core.c')
| -rw-r--r-- | drivers/nvmem/core.c | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 9b18ce90f907..f7301bb4ef3b 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -28,6 +28,7 @@ struct nvmem_device { size_t size; bool read_only; int flags; + enum nvmem_type type; struct bin_attribute eeprom; struct device *base_dev; struct list_head cells; @@ -44,6 +45,7 @@ struct nvmem_cell { int bytes; int bit_offset; int nbits; + struct device_node *np; struct nvmem_device *nvmem; struct list_head node; }; @@ -59,6 +61,13 @@ static LIST_HEAD(nvmem_lookup_list); static BLOCKING_NOTIFIER_HEAD(nvmem_notifier); +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 @@ -82,6 +91,21 @@ static int nvmem_reg_write(struct nvmem_device *nvmem, unsigned int offset, return -EINVAL; } +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) @@ -167,6 +191,7 @@ static struct bin_attribute *nvmem_bin_rw_attributes[] = { static const struct attribute_group nvmem_bin_rw_group = { .bin_attrs = nvmem_bin_rw_attributes, + .attrs = nvmem_attrs, }; static const struct attribute_group *nvmem_rw_dev_groups[] = { @@ -190,6 +215,7 @@ static struct bin_attribute *nvmem_bin_ro_attributes[] = { static const struct attribute_group nvmem_bin_ro_group = { .bin_attrs = nvmem_bin_ro_attributes, + .attrs = nvmem_attrs, }; static const struct attribute_group *nvmem_ro_dev_groups[] = { @@ -214,6 +240,7 @@ static struct bin_attribute *nvmem_bin_rw_root_attributes[] = { static const struct attribute_group nvmem_bin_rw_root_group = { .bin_attrs = nvmem_bin_rw_root_attributes, + .attrs = nvmem_attrs, }; static const struct attribute_group *nvmem_rw_root_dev_groups[] = { @@ -237,6 +264,7 @@ static struct bin_attribute *nvmem_bin_ro_root_attributes[] = { static const struct attribute_group nvmem_bin_ro_root_group = { .bin_attrs = nvmem_bin_ro_root_attributes, + .attrs = nvmem_attrs, }; static const struct attribute_group *nvmem_ro_root_dev_groups[] = { @@ -298,6 +326,7 @@ static void nvmem_cell_drop(struct nvmem_cell *cell) mutex_lock(&nvmem_mutex); list_del(&cell->node); mutex_unlock(&nvmem_mutex); + of_node_put(cell->np); kfree(cell->name); kfree(cell); } @@ -530,6 +559,7 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem) 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 = kasprintf(GFP_KERNEL, "%pOFn", child); @@ -602,9 +632,11 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) nvmem->dev.bus = &nvmem_bus_type; nvmem->dev.parent = config->dev; 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); @@ -960,14 +992,13 @@ out: #if IS_ENABLED(CONFIG_OF) static struct nvmem_cell * -nvmem_find_cell_by_index(struct nvmem_device *nvmem, int index) +nvmem_find_cell_by_node(struct nvmem_device *nvmem, struct device_node *np) { struct nvmem_cell *cell = NULL; - int i = 0; mutex_lock(&nvmem_mutex); list_for_each_entry(cell, &nvmem->cells, node) { - if (index == i++) + if (np == cell->np) break; } mutex_unlock(&nvmem_mutex); @@ -1011,7 +1042,7 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id) if (IS_ERR(nvmem)) return ERR_CAST(nvmem); - cell = nvmem_find_cell_by_index(nvmem, index); + cell = nvmem_find_cell_by_node(nvmem, cell_np); if (!cell) { __nvmem_device_put(nvmem); return ERR_PTR(-ENOENT); |
