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Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c165
1 files changed, 105 insertions, 60 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 3d87fadaa160..f37d7838d2e3 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -45,8 +45,7 @@ struct nvmem_device {
#define to_nvmem_device(d) container_of(d, struct nvmem_device, dev)
#define FLAG_COMPAT BIT(0)
-
-struct nvmem_cell {
+struct nvmem_cell_entry {
const char *name;
int offset;
int bytes;
@@ -57,6 +56,11 @@ struct nvmem_cell {
struct list_head node;
};
+struct nvmem_cell {
+ struct nvmem_cell_entry *entry;
+ const char *id;
+};
+
static DEFINE_MUTEX(nvmem_mutex);
static DEFINE_IDA(nvmem_ida);
@@ -422,7 +426,7 @@ static struct bus_type nvmem_bus_type = {
.name = "nvmem",
};
-static void nvmem_cell_drop(struct nvmem_cell *cell)
+static void nvmem_cell_entry_drop(struct nvmem_cell_entry *cell)
{
blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_REMOVE, cell);
mutex_lock(&nvmem_mutex);
@@ -435,13 +439,13 @@ static void nvmem_cell_drop(struct nvmem_cell *cell)
static void nvmem_device_remove_all_cells(const struct nvmem_device *nvmem)
{
- struct nvmem_cell *cell, *p;
+ struct nvmem_cell_entry *cell, *p;
list_for_each_entry_safe(cell, p, &nvmem->cells, node)
- nvmem_cell_drop(cell);
+ nvmem_cell_entry_drop(cell);
}
-static void nvmem_cell_add(struct nvmem_cell *cell)
+static void nvmem_cell_entry_add(struct nvmem_cell_entry *cell)
{
mutex_lock(&nvmem_mutex);
list_add_tail(&cell->node, &cell->nvmem->cells);
@@ -449,9 +453,9 @@ static void nvmem_cell_add(struct nvmem_cell *cell)
blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_ADD, cell);
}
-static int nvmem_cell_info_to_nvmem_cell_nodup(struct nvmem_device *nvmem,
- const struct nvmem_cell_info *info,
- struct nvmem_cell *cell)
+static int nvmem_cell_info_to_nvmem_cell_entry_nodup(struct nvmem_device *nvmem,
+ const struct nvmem_cell_info *info,
+ struct nvmem_cell_entry *cell)
{
cell->nvmem = nvmem;
cell->offset = info->offset;
@@ -475,13 +479,13 @@ static int nvmem_cell_info_to_nvmem_cell_nodup(struct nvmem_device *nvmem,
return 0;
}
-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_entry(struct nvmem_device *nvmem,
+ const struct nvmem_cell_info *info,
+ struct nvmem_cell_entry *cell)
{
int err;
- err = nvmem_cell_info_to_nvmem_cell_nodup(nvmem, info, cell);
+ err = nvmem_cell_info_to_nvmem_cell_entry_nodup(nvmem, info, cell);
if (err)
return err;
@@ -505,7 +509,7 @@ static int nvmem_add_cells(struct nvmem_device *nvmem,
const struct nvmem_cell_info *info,
int ncells)
{
- struct nvmem_cell **cells;
+ struct nvmem_cell_entry **cells;
int i, rval;
cells = kcalloc(ncells, sizeof(*cells), GFP_KERNEL);
@@ -519,13 +523,13 @@ static int nvmem_add_cells(struct nvmem_device *nvmem,
goto err;
}
- rval = nvmem_cell_info_to_nvmem_cell(nvmem, &info[i], cells[i]);
+ rval = nvmem_cell_info_to_nvmem_cell_entry(nvmem, &info[i], cells[i]);
if (rval) {
kfree(cells[i]);
goto err;
}
- nvmem_cell_add(cells[i]);
+ nvmem_cell_entry_add(cells[i]);
}
/* remove tmp array */
@@ -534,7 +538,7 @@ static int nvmem_add_cells(struct nvmem_device *nvmem,
return 0;
err:
while (i--)
- nvmem_cell_drop(cells[i]);
+ nvmem_cell_entry_drop(cells[i]);
kfree(cells);
@@ -571,7 +575,7 @@ static int nvmem_add_cells_from_table(struct nvmem_device *nvmem)
{
const struct nvmem_cell_info *info;
struct nvmem_cell_table *table;
- struct nvmem_cell *cell;
+ struct nvmem_cell_entry *cell;
int rval = 0, i;
mutex_lock(&nvmem_cell_mutex);
@@ -586,15 +590,13 @@ static int nvmem_add_cells_from_table(struct nvmem_device *nvmem)
goto out;
}
- rval = nvmem_cell_info_to_nvmem_cell(nvmem,
- info,
- cell);
+ rval = nvmem_cell_info_to_nvmem_cell_entry(nvmem, info, cell);
if (rval) {
kfree(cell);
goto out;
}
- nvmem_cell_add(cell);
+ nvmem_cell_entry_add(cell);
}
}
}
@@ -604,10 +606,10 @@ out:
return rval;
}
-static struct nvmem_cell *
-nvmem_find_cell_by_name(struct nvmem_device *nvmem, const char *cell_id)
+static struct nvmem_cell_entry *
+nvmem_find_cell_entry_by_name(struct nvmem_device *nvmem, const char *cell_id)
{
- struct nvmem_cell *iter, *cell = NULL;
+ struct nvmem_cell_entry *iter, *cell = NULL;
mutex_lock(&nvmem_mutex);
list_for_each_entry(iter, &nvmem->cells, node) {
@@ -678,7 +680,7 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
{
struct device_node *parent, *child;
struct device *dev = &nvmem->dev;
- struct nvmem_cell *cell;
+ struct nvmem_cell_entry *cell;
const __be32 *addr;
int len;
@@ -727,7 +729,7 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
}
cell->np = of_node_get(child);
- nvmem_cell_add(cell);
+ nvmem_cell_entry_add(cell);
}
return 0;
@@ -1142,9 +1144,33 @@ struct nvmem_device *devm_nvmem_device_get(struct device *dev, const char *id)
}
EXPORT_SYMBOL_GPL(devm_nvmem_device_get);
+static struct nvmem_cell *nvmem_create_cell(struct nvmem_cell_entry *entry, const char *id)
+{
+ struct nvmem_cell *cell;
+ const char *name = NULL;
+
+ cell = kzalloc(sizeof(*cell), GFP_KERNEL);
+ if (!cell)
+ return ERR_PTR(-ENOMEM);
+
+ if (id) {
+ name = kstrdup_const(id, GFP_KERNEL);
+ if (!name) {
+ kfree(cell);
+ return ERR_PTR(-ENOMEM);
+ }
+ }
+
+ cell->id = name;
+ cell->entry = entry;
+
+ return cell;
+}
+
static struct nvmem_cell *
nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
{
+ struct nvmem_cell_entry *cell_entry;
struct nvmem_cell *cell = ERR_PTR(-ENOENT);
struct nvmem_cell_lookup *lookup;
struct nvmem_device *nvmem;
@@ -1169,11 +1195,15 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
break;
}
- cell = nvmem_find_cell_by_name(nvmem,
- lookup->cell_name);
- if (!cell) {
+ cell_entry = nvmem_find_cell_entry_by_name(nvmem,
+ lookup->cell_name);
+ if (!cell_entry) {
__nvmem_device_put(nvmem);
cell = ERR_PTR(-ENOENT);
+ } else {
+ cell = nvmem_create_cell(cell_entry, con_id);
+ if (IS_ERR(cell))
+ __nvmem_device_put(nvmem);
}
break;
}
@@ -1184,10 +1214,10 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
}
#if IS_ENABLED(CONFIG_OF)
-static struct nvmem_cell *
-nvmem_find_cell_by_node(struct nvmem_device *nvmem, struct device_node *np)
+static struct nvmem_cell_entry *
+nvmem_find_cell_entry_by_node(struct nvmem_device *nvmem, struct device_node *np)
{
- struct nvmem_cell *iter, *cell = NULL;
+ struct nvmem_cell_entry *iter, *cell = NULL;
mutex_lock(&nvmem_mutex);
list_for_each_entry(iter, &nvmem->cells, node) {
@@ -1217,6 +1247,7 @@ 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;
+ struct nvmem_cell_entry *cell_entry;
struct nvmem_cell *cell;
int index = 0;
@@ -1237,12 +1268,16 @@ 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_node(nvmem, cell_np);
- if (!cell) {
+ cell_entry = nvmem_find_cell_entry_by_node(nvmem, cell_np);
+ if (!cell_entry) {
__nvmem_device_put(nvmem);
return ERR_PTR(-ENOENT);
}
+ cell = nvmem_create_cell(cell_entry, id);
+ if (IS_ERR(cell))
+ __nvmem_device_put(nvmem);
+
return cell;
}
EXPORT_SYMBOL_GPL(of_nvmem_cell_get);
@@ -1348,13 +1383,17 @@ EXPORT_SYMBOL(devm_nvmem_cell_put);
*/
void nvmem_cell_put(struct nvmem_cell *cell)
{
- struct nvmem_device *nvmem = cell->nvmem;
+ struct nvmem_device *nvmem = cell->entry->nvmem;
+
+ if (cell->id)
+ kfree_const(cell->id);
+ kfree(cell);
__nvmem_device_put(nvmem);
}
EXPORT_SYMBOL_GPL(nvmem_cell_put);
-static void nvmem_shift_read_buffer_in_place(struct nvmem_cell *cell, void *buf)
+static void nvmem_shift_read_buffer_in_place(struct nvmem_cell_entry *cell, void *buf)
{
u8 *p, *b;
int i, extra, bit_offset = cell->bit_offset;
@@ -1387,8 +1426,8 @@ static void nvmem_shift_read_buffer_in_place(struct nvmem_cell *cell, void *buf)
}
static int __nvmem_cell_read(struct nvmem_device *nvmem,
- struct nvmem_cell *cell,
- void *buf, size_t *len)
+ struct nvmem_cell_entry *cell,
+ void *buf, size_t *len, const char *id)
{
int rc;
@@ -1419,18 +1458,18 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem,
*/
void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
{
- struct nvmem_device *nvmem = cell->nvmem;
+ struct nvmem_device *nvmem = cell->entry->nvmem;
u8 *buf;
int rc;
if (!nvmem)
return ERR_PTR(-EINVAL);
- buf = kzalloc(cell->bytes, GFP_KERNEL);
+ buf = kzalloc(cell->entry->bytes, GFP_KERNEL);
if (!buf)
return ERR_PTR(-ENOMEM);
- rc = __nvmem_cell_read(nvmem, cell, buf, len);
+ rc = __nvmem_cell_read(nvmem, cell->entry, buf, len, cell->id);
if (rc) {
kfree(buf);
return ERR_PTR(rc);
@@ -1440,7 +1479,7 @@ void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
}
EXPORT_SYMBOL_GPL(nvmem_cell_read);
-static void *nvmem_cell_prepare_write_buffer(struct nvmem_cell *cell,
+static void *nvmem_cell_prepare_write_buffer(struct nvmem_cell_entry *cell,
u8 *_buf, int len)
{
struct nvmem_device *nvmem = cell->nvmem;
@@ -1493,16 +1532,7 @@ err:
return ERR_PTR(rc);
}
-/**
- * nvmem_cell_write() - Write to a given nvmem cell
- *
- * @cell: nvmem cell to be written.
- * @buf: Buffer to be written.
- * @len: length of buffer to be written to nvmem cell.
- *
- * Return: length of bytes written or negative on failure.
- */
-int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len)
+static int __nvmem_cell_entry_write(struct nvmem_cell_entry *cell, void *buf, size_t len)
{
struct nvmem_device *nvmem = cell->nvmem;
int rc;
@@ -1528,6 +1558,21 @@ int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len)
return len;
}
+
+/**
+ * nvmem_cell_write() - Write to a given nvmem cell
+ *
+ * @cell: nvmem cell to be written.
+ * @buf: Buffer to be written.
+ * @len: length of buffer to be written to nvmem cell.
+ *
+ * Return: length of bytes written or negative on failure.
+ */
+int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len)
+{
+ return __nvmem_cell_entry_write(cell->entry, buf, len);
+}
+
EXPORT_SYMBOL_GPL(nvmem_cell_write);
static int nvmem_cell_read_common(struct device *dev, const char *cell_id,
@@ -1630,7 +1675,7 @@ static const void *nvmem_cell_read_variable_common(struct device *dev,
if (IS_ERR(cell))
return cell;
- nbits = cell->nbits;
+ nbits = cell->entry->nbits;
buf = nvmem_cell_read(cell, len);
nvmem_cell_put(cell);
if (IS_ERR(buf))
@@ -1726,18 +1771,18 @@ EXPORT_SYMBOL_GPL(nvmem_cell_read_variable_le_u64);
ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
struct nvmem_cell_info *info, void *buf)
{
- struct nvmem_cell cell;
+ struct nvmem_cell_entry cell;
int rc;
ssize_t len;
if (!nvmem)
return -EINVAL;
- rc = nvmem_cell_info_to_nvmem_cell_nodup(nvmem, info, &cell);
+ rc = nvmem_cell_info_to_nvmem_cell_entry_nodup(nvmem, info, &cell);
if (rc)
return rc;
- rc = __nvmem_cell_read(nvmem, &cell, buf, &len);
+ rc = __nvmem_cell_read(nvmem, &cell, buf, &len, NULL);
if (rc)
return rc;
@@ -1757,17 +1802,17 @@ EXPORT_SYMBOL_GPL(nvmem_device_cell_read);
int nvmem_device_cell_write(struct nvmem_device *nvmem,
struct nvmem_cell_info *info, void *buf)
{
- struct nvmem_cell cell;
+ struct nvmem_cell_entry cell;
int rc;
if (!nvmem)
return -EINVAL;
- rc = nvmem_cell_info_to_nvmem_cell_nodup(nvmem, info, &cell);
+ rc = nvmem_cell_info_to_nvmem_cell_entry_nodup(nvmem, info, &cell);
if (rc)
return rc;
- return nvmem_cell_write(&cell, buf, cell.bytes);
+ return __nvmem_cell_entry_write(&cell, buf, cell.bytes);
}
EXPORT_SYMBOL_GPL(nvmem_device_cell_write);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 22:55:27 +0000