drivers/mtd/spi-nor/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   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
  10 static 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 }
  19 static DEVICE_ATTR_RO(manufacturer);
  20
  21 static 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 }
  30 static DEVICE_ATTR_RO(partname);
  31
  32 static 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 }
  43 static DEVICE_ATTR_RO(jedec_id);
  44
  45 static struct attribute *spi_nor_sysfs_entries[] = {
  46         &dev_attr_manufacturer.attr,
  47         &dev_attr_partname.attr,
  48         &dev_attr_jedec_id.attr,
  49         NULL
  50 };
  51
  52 static 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 }
  65 static BIN_ATTR_RO(sfdp, 0);
  66
  67 static struct bin_attribute *spi_nor_sysfs_bin_entries[] = {
  68         &bin_attr_sfdp,
  69         NULL
  70 };
  71
  72 static 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_jedec_id.attr && !nor->info->id && !nor->id)
  82                 return 0;
  83
  84         return 0444;
  85 }
  86
  87 static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj,
  88                                             struct bin_attribute *attr, int n)
  89 {
  90         struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
  91         struct spi_mem *spimem = spi_get_drvdata(spi);
  92         struct spi_nor *nor = spi_mem_get_drvdata(spimem);
  93
  94         if (attr == &bin_attr_sfdp && nor->sfdp)
  95                 return 0444;
  96
  97         return 0;
  98 }
  99
 100 static const struct attribute_group spi_nor_sysfs_group = {
 101         .name           = "spi-nor",
 102         .is_visible     = spi_nor_sysfs_is_visible,
 103         .is_bin_visible = spi_nor_sysfs_is_bin_visible,
 104         .attrs          = spi_nor_sysfs_entries,
 105         .bin_attrs      = spi_nor_sysfs_bin_entries,
 106 };
 107
 108 const struct attribute_group *spi_nor_sysfs_groups[] = {
 109         &spi_nor_sysfs_group,
 110         NULL
 111 };