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36ac022862
Add support to show the manufacturer, the partname and JEDEC identifier as well as to dump the SFDP table. Not all flashes list their SFDP table contents in their datasheet. So having that is useful. It might also be helpful in bug reports from users. Signed-off-by: Michael Walle <michael@walle.cc> Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com> Acked-by: Pratyush Yadav <p.yadav@ti.com>
93 lines
2.5 KiB
C
93 lines
2.5 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_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_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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