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Subject[PATCH v2 6/9] ufs: sysfs: string descriptors
Date
This patch introduces a sysfs group entry for the UFS string descriptors.
The group adds "string_descriptors" folder under the UFS driver
sysfs entry (/sys/bus/platform/drivers/ufshcd/*). The folder will contain
5 files that will show string values defined by the UFS spec:
a manufacturer name, a product name, an OEM id, a serial number and a
product revision. The full information about the string descriptors
could be found at UFS specifications 2.1.

Signed-off-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
---
Documentation/ABI/testing/sysfs-driver-ufs | 39 ++++++++++++++++++++
drivers/scsi/ufs/ufs-sysfs.c | 58 ++++++++++++++++++++++++++++++
drivers/scsi/ufs/ufshcd.c | 5 +--
drivers/scsi/ufs/ufshcd.h | 3 ++
4 files changed, 103 insertions(+), 2 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index 7b86efd..736280e 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -450,4 +450,43 @@ Description: This file shows maximum VCC, VCCQ and VCCQ2 value for
active ICC levels from 0 to 15. This is one of the UFS
power descriptor parameters. The full information about
the descriptor could be found at UFS specifications 2.1.
+ The file is read only.
+
+
+What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/manufacturer_name
+Date: August 2017
+Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
+Description: This file contains a device manufactureer name string.
+ The full information about the descriptor could be found at
+ UFS specifications 2.1.
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/product_name
+Date: August 2017
+Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
+Description: This file contains a product name string. The full information
+ about the descriptor could be found at UFS specifications 2.1.
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/oem_id
+Date: August 2017
+Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
+Description: This file contains a OEM ID string. The full information
+ about the descriptor could be found at UFS specifications 2.1.
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/serial_number
+Date: August 2017
+Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
+Description: This file contains a device serial number string. The full
+ information about the descriptor could be found at
+ UFS specifications 2.1.
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/product_revision
+Date: August 2017
+Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
+Description: This file contains a product revision string. The full
+ information about the descriptor could be found at
+ UFS specifications 2.1.
The file is read only.
\ No newline at end of file
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index a1a0636..1be058c 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -371,12 +371,70 @@ static const struct attribute_group ufs_sysfs_power_descriptor_group = {
.attrs = ufs_sysfs_power_descriptor,
};

+#define ufs_sysfs_string_descriptor_show(_name, _pname) \
+static ssize_t _name##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ u8 index; \
+ struct ufs_hba *hba = dev_get_drvdata(dev); \
+ int ret; \
+ int desc_len = QUERY_DESC_MAX_SIZE; \
+ u8 *desc_buf; \
+ desc_buf = kzalloc(QUERY_DESC_MAX_SIZE, GFP_ATOMIC); \
+ if (!desc_buf) \
+ return -ENOMEM; \
+ ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC, \
+ QUERY_DESC_IDN_DEVICE, 0, 0, desc_buf, &desc_len); \
+ if (ret) { \
+ ret = -EINVAL; \
+ goto out; \
+ } \
+ index = desc_buf[DEVICE_DESC_PARAM_##_pname]; \
+ memset(desc_buf, 0, QUERY_DESC_MAX_SIZE); \
+ if (ufshcd_read_string_desc(hba, index, desc_buf, \
+ QUERY_DESC_MAX_SIZE, true)) { \
+ ret = -EINVAL; \
+ goto out; \
+ } \
+ ret = snprintf(buf, PAGE_SIZE, "%s\n", \
+ desc_buf + QUERY_DESC_HDR_SIZE); \
+out: \
+ kfree(desc_buf); \
+ return ret; \
+}
+
+#define UFS_STRING_DESCRIPTOR(_name, _pname) \
+ ufs_sysfs_string_descriptor_show(_name, _pname) \
+ static DEVICE_ATTR_RO(_name)
+
+UFS_STRING_DESCRIPTOR(manufacturer_name, MANF_NAME);
+UFS_STRING_DESCRIPTOR(product_name, PRDCT_NAME);
+UFS_STRING_DESCRIPTOR(oem_id, OEM_ID);
+UFS_STRING_DESCRIPTOR(serial_number, SN);
+UFS_STRING_DESCRIPTOR(product_revision, PRDCT_REV);
+
+static struct attribute *ufs_sysfs_string_descriptors[] = {
+ &dev_attr_manufacturer_name.attr,
+ &dev_attr_product_name.attr,
+ &dev_attr_oem_id.attr,
+ &dev_attr_serial_number.attr,
+ &dev_attr_product_revision.attr,
+ NULL,
+};
+
+static const struct attribute_group ufs_sysfs_string_descriptors_group = {
+ .name = "string_descriptors",
+ .attrs = ufs_sysfs_string_descriptors,
+};
+
+
static const struct attribute_group *ufs_sysfs_groups[] = {
&ufs_sysfs_device_descriptor_group,
&ufs_sysfs_interconnect_descriptor_group,
&ufs_sysfs_geometry_descriptor_group,
&ufs_sysfs_health_descriptor_group,
&ufs_sysfs_power_descriptor_group,
+ &ufs_sysfs_string_descriptors_group,
NULL,
};

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 7b61e02..b78f6ab 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3115,8 +3115,8 @@ static int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size)
* Return 0 in case of success, non-zero otherwise
*/
#define ASCII_STD true
-static int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index,
- u8 *buf, u32 size, bool ascii)
+int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index,
+ u8 *buf, u32 size, bool ascii)
{
int err = 0;

@@ -3172,6 +3172,7 @@ static int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index,
out:
return err;
}
+EXPORT_SYMBOL(ufshcd_read_string_desc);

/**
* ufshcd_read_unit_desc_param - read the specified unit descriptor parameter
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 2235e7d..e5c2615 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -848,6 +848,9 @@ int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
u8 *desc_buf, int *buf_len);
int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
enum flag_idn idn, bool *flag_res);
+int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index,
+ u8 *buf, u32 size, bool ascii);
+
int ufshcd_hold(struct ufs_hba *hba, bool async);
void ufshcd_release(struct ufs_hba *hba);

--
2.7.4
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