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_bin_visible(struct kobject * kobj,struct bin_attribute * attr,int n)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 };
94