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
manufacturer_show(struct device * dev,struct device_attribute * attr,char * buf)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
partname_show(struct device * dev,struct device_attribute * attr,char * buf)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
jedec_id_show(struct device * dev,struct device_attribute * attr,char * buf)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
sfdp_read(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)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
spi_nor_sysfs_is_visible(struct kobject * kobj,struct attribute * attr,int n)70 static umode_t spi_nor_sysfs_is_visible(struct kobject *kobj,
71 struct 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 == &dev_attr_jedec_id.attr && !nor->info->id_len)
78 return 0;
79
80 return 0444;
81 }
82
spi_nor_sysfs_is_bin_visible(struct kobject * kobj,struct bin_attribute * attr,int n)83 static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj,
84 struct bin_attribute *attr, int n)
85 {
86 struct spi_device *spi = to_spi_device(kobj_to_dev(kobj));
87 struct spi_mem *spimem = spi_get_drvdata(spi);
88 struct spi_nor *nor = spi_mem_get_drvdata(spimem);
89
90 if (attr == &bin_attr_sfdp && nor->sfdp)
91 return 0444;
92
93 return 0;
94 }
95
96 static const struct attribute_group spi_nor_sysfs_group = {
97 .name = "spi-nor",
98 .is_visible = spi_nor_sysfs_is_visible,
99 .is_bin_visible = spi_nor_sysfs_is_bin_visible,
100 .attrs = spi_nor_sysfs_entries,
101 .bin_attrs = spi_nor_sysfs_bin_entries,
102 };
103
104 const struct attribute_group *spi_nor_sysfs_groups[] = {
105 &spi_nor_sysfs_group,
106 NULL
107 };
108