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 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 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 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 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 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 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