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	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	NULL
 50};
 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	NULL
 70};
 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	NULL
113};