diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor | 31 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/Makefile | 2 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/core.c | 1 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/core.h | 2 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/sysfs.c | 93 |
5 files changed, 128 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor b/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor new file mode 100644 index 000000000000..d76cd3946434 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor @@ -0,0 +1,31 @@ +What: /sys/bus/spi/devices/.../spi-nor/jedec_id +Date: April 2021 +KernelVersion: 5.14 +Contact: linux-mtd@lists.infradead.org +Description: (RO) The JEDEC ID of the SPI NOR flash as reported by the + flash device. + + +What: /sys/bus/spi/devices/.../spi-nor/manufacturer +Date: April 2021 +KernelVersion: 5.14 +Contact: linux-mtd@lists.infradead.org +Description: (RO) Manufacturer of the SPI NOR flash. + + +What: /sys/bus/spi/devices/.../spi-nor/partname +Date: April 2021 +KernelVersion: 5.14 +Contact: linux-mtd@lists.infradead.org +Description: (RO) Part name of the SPI NOR flash. + + +What: /sys/bus/spi/devices/.../spi-nor/sfdp +Date: April 2021 +KernelVersion: 5.14 +Contact: linux-mtd@lists.infradead.org +Description: (RO) This attribute is only present if the SPI NOR flash + device supports the "Read SFDP" command (5Ah). + + If present, it contains the complete SFDP (serial flash + discoverable parameters) binary data of the flash. diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile index 136f245c91dc..6b904e439372 100644 --- a/drivers/mtd/spi-nor/Makefile +++ b/drivers/mtd/spi-nor/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 -spi-nor-objs := core.o sfdp.o swp.o otp.o +spi-nor-objs := core.o sfdp.o swp.o otp.o sysfs.o spi-nor-objs += atmel.o spi-nor-objs += catalyst.o spi-nor-objs += eon.o diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index a21b0085de05..970ed6e3f3ba 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -3459,6 +3459,7 @@ static struct spi_mem_driver spi_nor_driver = { .driver = { .name = "spi-nor", .of_match_table = spi_nor_of_table, + .dev_groups = spi_nor_sysfs_groups, }, .id_table = spi_nor_dev_ids, }, diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h index f6dc28091c6d..3348e1dd1445 100644 --- a/drivers/mtd/spi-nor/core.h +++ b/drivers/mtd/spi-nor/core.h @@ -490,6 +490,8 @@ extern const struct spi_nor_manufacturer spi_nor_winbond; extern const struct spi_nor_manufacturer spi_nor_xilinx; extern const struct spi_nor_manufacturer spi_nor_xmc; +extern const struct attribute_group *spi_nor_sysfs_groups[]; + void spi_nor_spimem_setup_op(const struct spi_nor *nor, struct spi_mem_op *op, const enum spi_nor_protocol proto); diff --git a/drivers/mtd/spi-nor/sysfs.c b/drivers/mtd/spi-nor/sysfs.c new file mode 100644 index 000000000000..9aec9d8a98ad --- /dev/null +++ b/drivers/mtd/spi-nor/sysfs.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/mtd/spi-nor.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> +#include <linux/sysfs.h> + +#include "core.h" + +static ssize_t manufacturer_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct spi_device *spi = to_spi_device(dev); + struct spi_mem *spimem = spi_get_drvdata(spi); + struct spi_nor *nor = spi_mem_get_drvdata(spimem); + + return sysfs_emit(buf, "%s\n", nor->manufacturer->name); +} +static DEVICE_ATTR_RO(manufacturer); + +static ssize_t partname_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct spi_device *spi = to_spi_device(dev); + struct spi_mem *spimem = spi_get_drvdata(spi); + struct spi_nor *nor = spi_mem_get_drvdata(spimem); + + return sysfs_emit(buf, "%s\n", nor->info->name); +} +static DEVICE_ATTR_RO(partname); + +static ssize_t jedec_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct spi_device *spi = to_spi_device(dev); + struct spi_mem *spimem = spi_get_drvdata(spi); + struct spi_nor *nor = spi_mem_get_drvdata(spimem); + + return sysfs_emit(buf, "%*phN\n", nor->info->id_len, nor->info->id); +} +static DEVICE_ATTR_RO(jedec_id); + +static struct attribute *spi_nor_sysfs_entries[] = { + &dev_attr_manufacturer.attr, + &dev_attr_partname.attr, + &dev_attr_jedec_id.attr, + NULL +}; + +static ssize_t sfdp_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct spi_device *spi = to_spi_device(kobj_to_dev(kobj)); + struct spi_mem *spimem = spi_get_drvdata(spi); + struct spi_nor *nor = spi_mem_get_drvdata(spimem); + struct sfdp *sfdp = nor->sfdp; + size_t sfdp_size = sfdp->num_dwords * sizeof(*sfdp->dwords); + + return memory_read_from_buffer(buf, count, &off, nor->sfdp->dwords, + sfdp_size); +} +static BIN_ATTR_RO(sfdp, 0); + +static struct bin_attribute *spi_nor_sysfs_bin_entries[] = { + &bin_attr_sfdp, + NULL +}; + +static umode_t spi_nor_sysfs_is_bin_visible(struct kobject *kobj, + struct bin_attribute *attr, int n) +{ + struct spi_device *spi = to_spi_device(kobj_to_dev(kobj)); + struct spi_mem *spimem = spi_get_drvdata(spi); + struct spi_nor *nor = spi_mem_get_drvdata(spimem); + + if (attr == &bin_attr_sfdp && nor->sfdp) + return 0444; + + return 0; +} + +static const struct attribute_group spi_nor_sysfs_group = { + .name = "spi-nor", + .is_bin_visible = spi_nor_sysfs_is_bin_visible, + .attrs = spi_nor_sysfs_entries, + .bin_attrs = spi_nor_sysfs_bin_entries, +}; + +const struct attribute_group *spi_nor_sysfs_groups[] = { + &spi_nor_sysfs_group, + NULL +}; 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