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Message-ID: <20220601013232.801133-2-dev_public@wujek.eu>
Date: Wed, 01 Jun 2022 01:33:17 +0000
From: Adam Wujek <dev_public@...ek.eu>
To: unlisted-recipients:; (no To-header on input)
Cc: Adam Wujek <dev_public@...ek.eu>,
Guenter Roeck <linux@...ck-us.net>,
Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] hwmon: (pmbus) add MFR_* registers to debugfs
Add registers to debugfs:
PMBUS_MFR_ID
PMBUS_MFR_MODEL
PMBUS_MFR_REVISION
PMBUS_MFR_LOCATION
PMBUS_MFR_DATE
PMBUS_MFR_SERIAL
To reduce the number of debugfs entries, only values from page 0 are
reported. It is assumed that values of these registers are the same for
all pages. Please note that the PMBUS standard allows added registers to
be page-specific.
Signed-off-by: Adam Wujek <dev_public@...ek.eu>
---
- This is a reworked patch to report the registers only once (for page 0)
Changes in v2:
- no changes
Changes in v3:
- Change last paragraph od the commit message
- fix formating in the comment
drivers/hwmon/pmbus/pmbus_core.c | 99 +++++++++++++++++++++++++++++++-
1 file changed, 97 insertions(+), 2 deletions(-)
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index a1c70877ae68..9c55b0cf1511 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2659,6 +2659,34 @@ static int pmbus_debugfs_get_status(void *data, u64 *val)
DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_status, pmbus_debugfs_get_status,
NULL, "0x%04llx\n");
+static ssize_t pmbus_debugfs_mfr_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int rc;
+ struct pmbus_debugfs_entry *entry = file->private_data;
+ char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
+
+ rc = pmbus_read_block_data(entry->client, entry->page, entry->reg,
+ data);
+ if (rc < 0)
+ return rc;
+
+ /* Add newline at the end of a read data */
+ data[rc] = '\n';
+
+ /* Include newline into the length */
+ rc += 1;
+
+ return simple_read_from_buffer(buf, count, ppos, data, rc);
+}
+
+static const struct file_operations pmbus_debugfs_ops_mfr = {
+ .llseek = noop_llseek,
+ .read = pmbus_debugfs_mfr_read,
+ .write = NULL,
+ .open = simple_open,
+};
+
static int pmbus_debugfs_get_pec(void *data, u64 *val)
{
struct i2c_client *client = data;
@@ -2723,9 +2751,13 @@ static int pmbus_init_debugfs(struct i2c_client *client,
return -ENODEV;
}
- /* Allocate the max possible entries we need. */
+ /*
+ * Allocate the max possible entries we need.
+ * 6 entries device-specific
+ * 10 entries page-specific
+ */
entries = devm_kcalloc(data->dev,
- data->info->pages * 10, sizeof(*entries),
+ 6 + data->info->pages * 10, sizeof(*entries),
GFP_KERNEL);
if (!entries)
return -ENOMEM;
@@ -2733,6 +2765,69 @@ static int pmbus_init_debugfs(struct i2c_client *client,
debugfs_create_file("pec", 0664, data->debugfs, client,
&pmbus_debugfs_ops_pec);
+ /*
+ * Add device-specific entries.
+ * Please note that the PMBUS standard allows all registers to be
+ * page-specific.
+ * To reduce the number of debugfs entries for devices with many pages
+ * assume that values of the following registers are the same for all
+ * pages and report values only for page 0.
+ */
+ if (pmbus_check_block_register(client, 0, PMBUS_MFR_ID)) {
+ entries[idx].client = client;
+ entries[idx].page = 0;
+ entries[idx].reg = PMBUS_MFR_ID;
+ debugfs_create_file("mfr_id", 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops_mfr);
+ }
+
+ if (pmbus_check_block_register(client, 0, PMBUS_MFR_MODEL)) {
+ entries[idx].client = client;
+ entries[idx].page = 0;
+ entries[idx].reg = PMBUS_MFR_MODEL;
+ debugfs_create_file("mfr_model", 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops_mfr);
+ }
+
+ if (pmbus_check_block_register(client, 0, PMBUS_MFR_REVISION)) {
+ entries[idx].client = client;
+ entries[idx].page = 0;
+ entries[idx].reg = PMBUS_MFR_REVISION;
+ debugfs_create_file("mfr_revision", 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops_mfr);
+ }
+
+ if (pmbus_check_block_register(client, 0, PMBUS_MFR_LOCATION)) {
+ entries[idx].client = client;
+ entries[idx].page = 0;
+ entries[idx].reg = PMBUS_MFR_LOCATION;
+ debugfs_create_file("mfr_location", 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops_mfr);
+ }
+
+ if (pmbus_check_block_register(client, 0, PMBUS_MFR_DATE)) {
+ entries[idx].client = client;
+ entries[idx].page = 0;
+ entries[idx].reg = PMBUS_MFR_DATE;
+ debugfs_create_file("mfr_date", 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops_mfr);
+ }
+
+ if (pmbus_check_block_register(client, 0, PMBUS_MFR_SERIAL)) {
+ entries[idx].client = client;
+ entries[idx].page = 0;
+ entries[idx].reg = PMBUS_MFR_SERIAL;
+ debugfs_create_file("mfr_serial", 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops_mfr);
+ }
+
+ /* Add page specific entries */
for (i = 0; i < data->info->pages; ++i) {
/* Check accessibility of status register if it's not page 0 */
if (!i || pmbus_check_status_register(client, i)) {
--
2.17.1
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