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Merge "nvmem: core: Export nvmem cell info to userspace"

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qctecmdr 2020-05-22 16:30:13 -07:00 • committed by Gerrit - the friendly Code Review server
commit 07b4fed769
2 changed files with 52 additions and 0 deletions
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7
drivers/nvmem/Kconfig
View file

@ -97,6 +97,13 @@ config MTK_EFUSE
This driver can also be built as a module. If so, the module
will be called efuse-mtk.
config QCOM_QFPROM_SYSFS
tristate "QCOM QFPROM SYSFS"
depends on QCOM_QFPROM
help
Say y here to enable QFPROM SYSFS support. The QFPROM SYSFS
create each child node of QFPROM as sysfs entries as well.
config QCOM_QFPROM
tristate "QCOM QFPROM Support"
depends on ARCH_QCOM || COMPILE_TEST

45
drivers/nvmem/core.c
View file

@ -27,6 +27,9 @@ struct nvmem_cell {
int nbits;
struct device_node *np;
struct nvmem_device *nvmem;
#ifdef CONFIG_QCOM_QFPROM_SYSFS
struct bin_attribute attr;
#endif
struct list_head node;
};
@ -60,6 +63,28 @@ static int nvmem_reg_write(struct nvmem_device *nvmem, unsigned int offset,
return -EINVAL;
}
#ifdef CONFIG_QCOM_QFPROM_SYSFS
static ssize_t bin_attr_nvmem_cell_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t pos, size_t count)
{
struct nvmem_cell *cell;
size_t len;
u8 *data;
cell = attr->private;
data = nvmem_cell_read(cell, &len);
if (IS_ERR(data))
return -EINVAL;
len = min(len, count);
memcpy(buf, data, len);
kfree(data);
return len;
}
#endif
static void nvmem_release(struct device *dev)
{
struct nvmem_device *nvmem = to_nvmem_device(dev);
@ -107,6 +132,9 @@ static void nvmem_cell_drop(struct nvmem_cell *cell)
{
blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_REMOVE, cell);
mutex_lock(&nvmem_mutex);
#ifdef CONFIG_QCOM_QFPROM_SYSFS
device_remove_bin_file(&cell->nvmem->dev, &cell->attr);
#endif
list_del(&cell->node);
mutex_unlock(&nvmem_mutex);
of_node_put(cell->np);
@ -124,8 +152,25 @@ static void nvmem_device_remove_all_cells(const struct nvmem_device *nvmem)
static void nvmem_cell_add(struct nvmem_cell *cell)
{
#ifdef CONFIG_QCOM_QFPROM_SYSFS
int rval;
struct bin_attribute *nvmem_cell_attr = &cell->attr;
#endif
mutex_lock(&nvmem_mutex);
list_add_tail(&cell->node, &cell->nvmem->cells);
#ifdef CONFIG_QCOM_QFPROM_SYSFS
/* add attr for this cell */
nvmem_cell_attr->attr.name = cell->name;
nvmem_cell_attr->attr.mode = 0444;
nvmem_cell_attr->private = cell;
nvmem_cell_attr->size = cell->bytes;
nvmem_cell_attr->read = bin_attr_nvmem_cell_read;
rval = device_create_bin_file(&cell->nvmem->dev, nvmem_cell_attr);
if (rval)
dev_err(&cell->nvmem->dev,
"Failed to create cell binary file %d\n", rval);
#endif
mutex_unlock(&nvmem_mutex);
blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_ADD, cell);
}