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
  39         return sysfs_emit(buf, "%*phN\n", nor->info->id_len, nor->info->id);
  40 }
  41 static DEVICE_ATTR_RO(jedec_id);
  42
  43 static struct attribute *spi_nor_sysfs_entries[] = {
  44         &dev_attr_manufacturer.attr,
  45         &dev_attr_partname.attr,
  46         &dev_attr_jedec_id.attr,
  47         NULL
  48 };
  49
  50 static ssize_t sfdp_read(struct file *filp, struct kobject *kobj,
  51                          struct bin_attribute *bin_attr, char *buf,
  52                          loff_t off, size_t count)
  53 {
  54         struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
  55         struct spi_mem *spimem = spi_get_drvdata(spi);
  56         struct spi_nor *nor = spi_mem_get_drvdata(spimem);
  57         struct sfdp *sfdp = nor->sfdp;
  58         size_t sfdp_size = sfdp->num_dwords * sizeof(*sfdp->dwords);
  59
  60         return memory_read_from_buffer(buf, count, &off, nor->sfdp->dwords,
  61                                        sfdp_size);
  62 }
  63 static BIN_ATTR_RO(sfdp, 0);
  64
  65 static struct bin_attribute *spi_nor_sysfs_bin_entries[] = {
  66         &bin_attr_sfdp,
  67         NULL
  68 };
  69
  70 static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj,
  71                                             struct bin_attribute *attr, int n)
  72 {
  73         struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
  74         struct spi_mem *spimem = spi_get_drvdata(spi);
  75         struct spi_nor *nor = spi_mem_get_drvdata(spimem);
  76
  77         if (attr == &bin_attr_sfdp && nor->sfdp)
  78                 return 0444;
  79
  80         return 0;
  81 }
  82
  83 static const struct attribute_group spi_nor_sysfs_group = {
  84         .name           = "spi-nor",
  85         .is_bin_visible = spi_nor_sysfs_is_bin_visible,
  86         .attrs          = spi_nor_sysfs_entries,
  87         .bin_attrs      = spi_nor_sysfs_bin_entries,
  88 };
  89
  90 const struct attribute_group *spi_nor_sysfs_groups[] = {
  91         &spi_nor_sysfs_group,
  92         NULL
  93 };