58e1a0ef52
[ Upstream commit 7d388551b6888f3725e6c957f472526b35161a5b ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/mtd/spi-nor.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/spi-mem.h>
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#include <linux/sysfs.h>
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#include "core.h"
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static ssize_t manufacturer_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct spi_mem *spimem = spi_get_drvdata(spi);
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struct spi_nor *nor = spi_mem_get_drvdata(spimem);
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return sysfs_emit(buf, "%s\n", nor->manufacturer->name);
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}
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static DEVICE_ATTR_RO(manufacturer);
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static ssize_t partname_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct spi_mem *spimem = spi_get_drvdata(spi);
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struct spi_nor *nor = spi_mem_get_drvdata(spimem);
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return sysfs_emit(buf, "%s\n", nor->info->name);
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}
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static DEVICE_ATTR_RO(partname);
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static ssize_t jedec_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct spi_mem *spimem = spi_get_drvdata(spi);
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struct spi_nor *nor = spi_mem_get_drvdata(spimem);
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return sysfs_emit(buf, "%*phN\n", nor->info->id_len, nor->info->id);
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}
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static DEVICE_ATTR_RO(jedec_id);
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static struct attribute *spi_nor_sysfs_entries[] = {
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&dev_attr_manufacturer.attr,
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&dev_attr_partname.attr,
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&dev_attr_jedec_id.attr,
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NULL
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};
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static ssize_t sfdp_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t off, size_t count)
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{
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struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
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struct spi_mem *spimem = spi_get_drvdata(spi);
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struct spi_nor *nor = spi_mem_get_drvdata(spimem);
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struct sfdp *sfdp = nor->sfdp;
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size_t sfdp_size = sfdp->num_dwords * sizeof(*sfdp->dwords);
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return memory_read_from_buffer(buf, count, &off, nor->sfdp->dwords,
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sfdp_size);
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}
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static BIN_ATTR_RO(sfdp, 0);
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static struct bin_attribute *spi_nor_sysfs_bin_entries[] = {
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&bin_attr_sfdp,
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NULL
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};
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static umode_t spi_nor_sysfs_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
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struct spi_mem *spimem = spi_get_drvdata(spi);
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struct spi_nor *nor = spi_mem_get_drvdata(spimem);
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if (attr == &dev_attr_jedec_id.attr && !nor->info->id_len)
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return 0;
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return 0444;
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}
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static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj,
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struct bin_attribute *attr, int n)
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{
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struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
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struct spi_mem *spimem = spi_get_drvdata(spi);
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struct spi_nor *nor = spi_mem_get_drvdata(spimem);
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if (attr == &bin_attr_sfdp && nor->sfdp)
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return 0444;
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return 0;
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}
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static const struct attribute_group spi_nor_sysfs_group = {
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.name = "spi-nor",
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.is_visible = spi_nor_sysfs_is_visible,
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.is_bin_visible = spi_nor_sysfs_is_bin_visible,
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.attrs = spi_nor_sysfs_entries,
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.bin_attrs = spi_nor_sysfs_bin_entries,
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};
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const struct attribute_group *spi_nor_sysfs_groups[] = {
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&spi_nor_sysfs_group,
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NULL
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};
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