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mtd: spi-nor: hide jedec_id sysfs attribute if not present 

Some non-jedec compliant flashes (like the Everspin flashes) don't have
an ID at all. Hide the attribute in this case.

Fixes: 36ac022862 ("mtd: spi-nor: add initial sysfs support")
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Link: https://lore.kernel.org/r/20220810220654.1297699-2-michael@walle.cc
This commit is contained in:
Michael Walle 2022-08-11 00:06:48 +02:00 committed by Tudor Ambarus
parent 2ebc336be0
commit 7d388551b6
2 changed files with 17 additions and 0 deletions
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3
Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor
View File

@ -5,6 +5,9 @@ Contact: linux-mtd@lists.infradead.org
Description: (RO) The JEDEC ID of the SPI NOR flash as reported by the
flash device.
The attribute is not present if the flash doesn't support
the "Read JEDEC ID" command (9Fh). This is the case for
non-JEDEC compliant flashes.
What: /sys/bus/spi/devices/.../spi-nor/manufacturer
Date: April 2021

14
drivers/mtd/spi-nor/sysfs.c
View File

@ -67,6 +67,19 @@ static struct bin_attribute *spi_nor_sysfs_bin_entries[] = {
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_jedec_id.attr && !nor->info->id_len)
return 0;
return 0444;
}
static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj,
struct bin_attribute *attr, int n)
{
@ -82,6 +95,7 @@ static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj,
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,