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 const u8 *id = nor->info->id_len ? nor->info->id : nor->id;
39 u8 id_len = 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
sfdp_read(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)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
spi_nor_sysfs_is_visible(struct kobject * kobj,struct attribute * attr,int n)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_len && !nor->id)
82 return 0;
83
84 return 0444;
85 }
86
spi_nor_sysfs_is_bin_visible(struct kobject * kobj,struct bin_attribute * attr,int n)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 };
112