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1// SPDX-License-Identifier: GPL-2.02 3#include <linux/mtd/spi-nor.h>4#include <linux/spi/spi.h>5#include <linux/spi/spi-mem.h>6#include <linux/sysfs.h>7 8#include "core.h"9 10static ssize_t manufacturer_show(struct device *dev,11 struct device_attribute *attr, char *buf)12{13 struct spi_device *spi = to_spi_device(dev);14 struct spi_mem *spimem = spi_get_drvdata(spi);15 struct spi_nor *nor = spi_mem_get_drvdata(spimem);16 17 return sysfs_emit(buf, "%s\n", nor->manufacturer->name);18}19static DEVICE_ATTR_RO(manufacturer);20 21static ssize_t partname_show(struct device *dev,22 struct device_attribute *attr, char *buf)23{24 struct spi_device *spi = to_spi_device(dev);25 struct spi_mem *spimem = spi_get_drvdata(spi);26 struct spi_nor *nor = spi_mem_get_drvdata(spimem);27 28 return sysfs_emit(buf, "%s\n", nor->info->name);29}30static DEVICE_ATTR_RO(partname);31 32static ssize_t jedec_id_show(struct device *dev,33 struct device_attribute *attr, char *buf)34{35 struct spi_device *spi = to_spi_device(dev);36 struct spi_mem *spimem = spi_get_drvdata(spi);37 struct spi_nor *nor = spi_mem_get_drvdata(spimem);38 const u8 *id = nor->info->id ? nor->info->id->bytes : nor->id;39 u8 id_len = nor->info->id ? nor->info->id->len : SPI_NOR_MAX_ID_LEN;40 41 return sysfs_emit(buf, "%*phN\n", id_len, id);42}43static DEVICE_ATTR_RO(jedec_id);44 45static struct attribute *spi_nor_sysfs_entries[] = {46 &dev_attr_manufacturer.attr,47 &dev_attr_partname.attr,48 &dev_attr_jedec_id.attr,49 NULL50};51 52static ssize_t sfdp_read(struct file *filp, struct kobject *kobj,53 struct bin_attribute *bin_attr, char *buf,54 loff_t off, size_t count)55{56 struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));57 struct spi_mem *spimem = spi_get_drvdata(spi);58 struct spi_nor *nor = spi_mem_get_drvdata(spimem);59 struct sfdp *sfdp = nor->sfdp;60 size_t sfdp_size = sfdp->num_dwords * sizeof(*sfdp->dwords);61 62 return memory_read_from_buffer(buf, count, &off, nor->sfdp->dwords,63 sfdp_size);64}65static BIN_ATTR_RO(sfdp, 0);66 67static struct bin_attribute *spi_nor_sysfs_bin_entries[] = {68 &bin_attr_sfdp,69 NULL70};71 72static umode_t spi_nor_sysfs_is_visible(struct kobject *kobj,73 struct attribute *attr, int n)74{75 struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));76 struct spi_mem *spimem = spi_get_drvdata(spi);77 struct spi_nor *nor = spi_mem_get_drvdata(spimem);78 79 if (attr == &dev_attr_manufacturer.attr && !nor->manufacturer)80 return 0;81 if (attr == &dev_attr_partname.attr && !nor->info->name)82 return 0;83 if (attr == &dev_attr_jedec_id.attr && !nor->info->id && !nor->id)84 return 0;85 86 return 0444;87}88 89static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj,90 struct bin_attribute *attr, int n)91{92 struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));93 struct spi_mem *spimem = spi_get_drvdata(spi);94 struct spi_nor *nor = spi_mem_get_drvdata(spimem);95 96 if (attr == &bin_attr_sfdp && nor->sfdp)97 return 0444;98 99 return 0;100}101 102static const struct attribute_group spi_nor_sysfs_group = {103 .name = "spi-nor",104 .is_visible = spi_nor_sysfs_is_visible,105 .is_bin_visible = spi_nor_sysfs_is_bin_visible,106 .attrs = spi_nor_sysfs_entries,107 .bin_attrs = spi_nor_sysfs_bin_entries,108};109 110const struct attribute_group *spi_nor_sysfs_groups[] = {111 &spi_nor_sysfs_group,112 NULL113};114