linux-kernel - [PATCH v5 6/7] hwmon: pmbus: adm1266: debugfs for blackbox info

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Date:   Wed, 24 Jun 2020 18:17:35 +0300
From:   <alexandru.tachici@...log.com>
To:     <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
CC:     <robh+dt@...nel.org>, <linux@...ck-us.net>,
        Alexandru Tachici <alexandru.tachici@...log.com>
Subject: [PATCH v5 6/7] hwmon: pmbus: adm1266: debugfs for blackbox info

From: Alexandru Tachici <alexandru.tachici@...log.com>

Add a debugfs file to print information in the
BLACKBOX_INFORMATION register. Contains information
about the number of stored records, logic index and id
of the latest record.

Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>
---
 drivers/hwmon/pmbus/adm1266.c | 56 ++++++++++++++++++++++++++++++++++-
 1 file changed, 55 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c
index b9e92ab1e39a..ea2dc481094b 100644
--- a/drivers/hwmon/pmbus/adm1266.c
+++ b/drivers/hwmon/pmbus/adm1266.c
@@ -60,6 +60,7 @@ struct adm1266_data {
 	const char *gpio_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR];
 	struct i2c_client *client;
 	struct mutex ioctl_mutex; /* lock ioctl access */
+	struct dentry *debugfs_dir;
 	struct nvmem_config nvmem_config;
 	struct nvmem_device *nvmem;
 	u8 *dev_mem;
@@ -406,6 +407,28 @@ static const struct proc_ops adm1266_proc_ops = {
 	.proc_ioctl	= adm1266_ioctl,
 };
 
+static int adm1266_blackbox_information_read(struct seq_file *s, void *pdata)
+{
+	struct device *dev = s->private;
+	struct i2c_client *client = to_i2c_client(dev);
+	u8 read_buf[5];
+	unsigned int latest_id;
+	int ret;
+
+	ret = i2c_smbus_read_block_data(client, ADM1266_BLACKBOX_INFO,
+					read_buf);
+	if (ret < 0)
+		return ret;
+
+	seq_puts(s, "BLACKBOX_INFORMATION:\n");
+	latest_id = read_buf[0] + (read_buf[1] << 8);
+	seq_printf(s, "Black box ID: %u\n", latest_id);
+	seq_printf(s, "Logic index: %u\n", read_buf[2]);
+	seq_printf(s, "Record count: %u\n", read_buf[3]);
+
+	return 0;
+}
+
 static int adm1266_init_procfs(struct adm1266_data *data)
 {
 	struct proc_dir_entry *proc_dir;
@@ -423,6 +446,29 @@ static int adm1266_init_procfs(struct adm1266_data *data)
 	return 0;
 }
 
+static int adm1266_init_debugfs(struct adm1266_data *data)
+{
+	struct dentry *entry;
+	struct dentry *root;
+
+	root = pmbus_get_debugfs_dir(data->client);
+	if (!root)
+		return -ENOENT;
+
+	data->debugfs_dir = debugfs_create_dir(data->client->name, root);
+	if (!data->debugfs_dir)
+		return -ENOENT;
+
+	entry = debugfs_create_devm_seqfile(&data->client->dev,
+					    "blackbox_information",
+					    data->debugfs_dir,
+					    adm1266_blackbox_information_read);
+	if (!entry)
+		return -ENOENT;
+
+	return 0;
+}
+
 static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *buf)
 {
 	u8 read_buf[5];
@@ -571,7 +617,15 @@ static int adm1266_probe(struct i2c_client *client,
 	for (i = 0; i < info->pages; i++)
 		info->func[i] = funcs;
 
-	return pmbus_do_probe(client, id, info);
+	ret = pmbus_do_probe(client, id, info);
+	if (ret)
+		return ret;
+
+	ret = adm1266_init_debugfs(data);
+	if (ret)
+		dev_warn(&client->dev, "Failed to register debugfs: %d\n", ret);
+
+	return 0;
 }
 
 static const struct of_device_id adm1266_of_match[] = {
-- 
2.20.1