cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sysfs.c (2606B)

      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
     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
     39	return sysfs_emit(buf, "%*phN\n", nor->info->id_len, nor->info->id);
     40}
     41static DEVICE_ATTR_RO(jedec_id);
     42
     43static 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
     50static 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}
     63static BIN_ATTR_RO(sfdp, 0);
     64
     65static struct bin_attribute *spi_nor_sysfs_bin_entries[] = {
     66	&bin_attr_sfdp,
     67	NULL
     68};
     69
     70static 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
     83static 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
     90const struct attribute_group *spi_nor_sysfs_groups[] = {
     91	&spi_nor_sysfs_group,
     92	NULL
     93};