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path: root/drivers/mtd/spi-nor/sysfs.c
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Diffstat (limited to 'drivers/mtd/spi-nor/sysfs.c')
-rw-r--r--drivers/mtd/spi-nor/sysfs.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/sysfs.c b/drivers/mtd/spi-nor/sysfs.c
new file mode 100644
index 0000000000..c09bb832b3
--- /dev/null
+++ b/drivers/mtd/spi-nor/sysfs.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/mtd/spi-nor.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+#include <linux/sysfs.h>
+
+#include "core.h"
+
+static ssize_t manufacturer_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct spi_mem *spimem = spi_get_drvdata(spi);
+ struct spi_nor *nor = spi_mem_get_drvdata(spimem);
+
+ return sysfs_emit(buf, "%s\n", nor->manufacturer->name);
+}
+static DEVICE_ATTR_RO(manufacturer);
+
+static ssize_t partname_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct spi_mem *spimem = spi_get_drvdata(spi);
+ struct spi_nor *nor = spi_mem_get_drvdata(spimem);
+
+ return sysfs_emit(buf, "%s\n", nor->info->name);
+}
+static DEVICE_ATTR_RO(partname);
+
+static ssize_t jedec_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct spi_mem *spimem = spi_get_drvdata(spi);
+ struct spi_nor *nor = spi_mem_get_drvdata(spimem);
+ const u8 *id = nor->info->id_len ? nor->info->id : nor->id;
+ u8 id_len = nor->info->id_len ?: SPI_NOR_MAX_ID_LEN;
+
+ return sysfs_emit(buf, "%*phN\n", id_len, id);
+}
+static DEVICE_ATTR_RO(jedec_id);
+
+static struct attribute *spi_nor_sysfs_entries[] = {
+ &dev_attr_manufacturer.attr,
+ &dev_attr_partname.attr,
+ &dev_attr_jedec_id.attr,
+ NULL
+};
+
+static ssize_t sfdp_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
+ struct spi_mem *spimem = spi_get_drvdata(spi);
+ struct spi_nor *nor = spi_mem_get_drvdata(spimem);
+ struct sfdp *sfdp = nor->sfdp;
+ size_t sfdp_size = sfdp->num_dwords * sizeof(*sfdp->dwords);
+
+ return memory_read_from_buffer(buf, count, &off, nor->sfdp->dwords,
+ sfdp_size);
+}
+static BIN_ATTR_RO(sfdp, 0);
+
+static struct bin_attribute *spi_nor_sysfs_bin_entries[] = {
+ &bin_attr_sfdp,
+ NULL
+};
+
+static umode_t spi_nor_sysfs_is_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
+ struct spi_mem *spimem = spi_get_drvdata(spi);
+ struct spi_nor *nor = spi_mem_get_drvdata(spimem);
+
+ if (attr == &dev_attr_manufacturer.attr && !nor->manufacturer)
+ return 0;
+ if (attr == &dev_attr_jedec_id.attr && !nor->info->id_len && !nor->id)
+ return 0;
+
+ return 0444;
+}
+
+static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj,
+ struct bin_attribute *attr, int n)
+{
+ struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
+ struct spi_mem *spimem = spi_get_drvdata(spi);
+ struct spi_nor *nor = spi_mem_get_drvdata(spimem);
+
+ if (attr == &bin_attr_sfdp && nor->sfdp)
+ return 0444;
+
+ return 0;
+}
+
+static const struct attribute_group spi_nor_sysfs_group = {
+ .name = "spi-nor",
+ .is_visible = spi_nor_sysfs_is_visible,
+ .is_bin_visible = spi_nor_sysfs_is_bin_visible,
+ .attrs = spi_nor_sysfs_entries,
+ .bin_attrs = spi_nor_sysfs_bin_entries,
+};
+
+const struct attribute_group *spi_nor_sysfs_groups[] = {
+ &spi_nor_sysfs_group,
+ NULL
+};