scsi: ufs: sysfs: power descriptor

This patch introduces a sysfs group entry for the UFS power descriptor
parameters. The group adds "power_descriptor" folder under the UFS driver
sysfs entry (/sys/bus/platform/drivers/ufshcd/*). The parameters are shown
as hexadecimal numbers. The full information about the parameters could be
found at UFS specifications 2.1.

Signed-off-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index ddb012b..7460566 100644 (file)
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -441,3 +441,13 @@ Description:       This file shows indication of the device life time
                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/*/power_descriptor/active_icc_levels_vcc*
+Date:          February 2018
+Contact:       Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
+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.

diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index c4f18b0..16e357a 100644 (file)
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -368,12 +368,129 @@ static const struct attribute_group ufs_sysfs_health_descriptor_group = {
        .attrs = ufs_sysfs_health_descriptor,
 };
 
+#define UFS_POWER_DESC_PARAM(_name, _uname, _index)                    \
+static ssize_t _name##_index##_show(struct device *dev,                        \
+       struct device_attribute *attr, char *buf)                       \
+{                                                                      \
+       struct ufs_hba *hba = dev_get_drvdata(dev);                     \
+       return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_POWER, 0,  \
+               PWR_DESC##_uname##_0 + _index * 2, buf, 2);             \
+}                                                                      \
+static DEVICE_ATTR_RO(_name##_index)
+
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 0);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 1);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 2);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 3);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 4);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 5);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 6);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 7);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 8);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 9);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 10);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 11);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 12);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 13);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 14);
+UFS_POWER_DESC_PARAM(active_icc_levels_vcc, _ACTIVE_LVLS_VCC, 15);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 0);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 1);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 2);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 3);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 4);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 5);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 6);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 7);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 8);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 9);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 10);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 11);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 12);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 13);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 14);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq, _ACTIVE_LVLS_VCCQ, 15);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 0);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 1);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 2);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 3);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 4);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 5);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 6);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 7);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 8);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 9);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 10);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 11);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 12);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 13);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 14);
+UFS_POWER_DESC_PARAM(active_icc_levels_vccq2, _ACTIVE_LVLS_VCCQ2, 15);
+
+static struct attribute *ufs_sysfs_power_descriptor[] = {
+       &dev_attr_active_icc_levels_vcc0.attr,
+       &dev_attr_active_icc_levels_vcc1.attr,
+       &dev_attr_active_icc_levels_vcc2.attr,
+       &dev_attr_active_icc_levels_vcc3.attr,
+       &dev_attr_active_icc_levels_vcc4.attr,
+       &dev_attr_active_icc_levels_vcc5.attr,
+       &dev_attr_active_icc_levels_vcc6.attr,
+       &dev_attr_active_icc_levels_vcc7.attr,
+       &dev_attr_active_icc_levels_vcc8.attr,
+       &dev_attr_active_icc_levels_vcc9.attr,
+       &dev_attr_active_icc_levels_vcc10.attr,
+       &dev_attr_active_icc_levels_vcc11.attr,
+       &dev_attr_active_icc_levels_vcc12.attr,
+       &dev_attr_active_icc_levels_vcc13.attr,
+       &dev_attr_active_icc_levels_vcc14.attr,
+       &dev_attr_active_icc_levels_vcc15.attr,
+       &dev_attr_active_icc_levels_vccq0.attr,
+       &dev_attr_active_icc_levels_vccq1.attr,
+       &dev_attr_active_icc_levels_vccq2.attr,
+       &dev_attr_active_icc_levels_vccq3.attr,
+       &dev_attr_active_icc_levels_vccq4.attr,
+       &dev_attr_active_icc_levels_vccq5.attr,
+       &dev_attr_active_icc_levels_vccq6.attr,
+       &dev_attr_active_icc_levels_vccq7.attr,
+       &dev_attr_active_icc_levels_vccq8.attr,
+       &dev_attr_active_icc_levels_vccq9.attr,
+       &dev_attr_active_icc_levels_vccq10.attr,
+       &dev_attr_active_icc_levels_vccq11.attr,
+       &dev_attr_active_icc_levels_vccq12.attr,
+       &dev_attr_active_icc_levels_vccq13.attr,
+       &dev_attr_active_icc_levels_vccq14.attr,
+       &dev_attr_active_icc_levels_vccq15.attr,
+       &dev_attr_active_icc_levels_vccq20.attr,
+       &dev_attr_active_icc_levels_vccq21.attr,
+       &dev_attr_active_icc_levels_vccq22.attr,
+       &dev_attr_active_icc_levels_vccq23.attr,
+       &dev_attr_active_icc_levels_vccq24.attr,
+       &dev_attr_active_icc_levels_vccq25.attr,
+       &dev_attr_active_icc_levels_vccq26.attr,
+       &dev_attr_active_icc_levels_vccq27.attr,
+       &dev_attr_active_icc_levels_vccq28.attr,
+       &dev_attr_active_icc_levels_vccq29.attr,
+       &dev_attr_active_icc_levels_vccq210.attr,
+       &dev_attr_active_icc_levels_vccq211.attr,
+       &dev_attr_active_icc_levels_vccq212.attr,
+       &dev_attr_active_icc_levels_vccq213.attr,
+       &dev_attr_active_icc_levels_vccq214.attr,
+       &dev_attr_active_icc_levels_vccq215.attr,
+       NULL,
+};
+
+static const struct attribute_group ufs_sysfs_power_descriptor_group = {
+       .name = "power_descriptor",
+       .attrs = ufs_sysfs_power_descriptor,
+};
+
 static const struct attribute_group *ufs_sysfs_groups[] = {
        &ufs_sysfs_default_group,
        &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,
        NULL,
 };