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Date: Tue, 12 Jul 2022 15:35:04 -0400
From: ferlandm@...tus.ca
To: jdelvare@...e.com
Cc: linux@...ck-us.net, linux-hwmon@...r.kernel.org,
linux-kernel@...r.kernel.org, Marc Ferland <ferlandm@...tus.ca>
Subject: [PATCH] hwmon: (mcp3021) improve driver support for newer hwmon interface
From: Marc Ferland <ferlandm@...tus.ca>
This driver is currently broken, it does not show the in0_input sysfs
file and also returns the following message on startup:
hwmon_device_register() is deprecated. Please convert the driver to
use hwmon_device_register_with_info().
This patch converts the driver and also cleans up the 'read' function.
Signed-off-by: Marc Ferland <ferlandm@...tus.ca>
---
drivers/hwmon/mcp3021.c | 99 ++++++++++++++++++++---------------------
1 file changed, 49 insertions(+), 50 deletions(-)
diff --git a/drivers/hwmon/mcp3021.c b/drivers/hwmon/mcp3021.c
index ce2780768074..e093b1998296 100644
--- a/drivers/hwmon/mcp3021.c
+++ b/drivers/hwmon/mcp3021.c
@@ -7,7 +7,7 @@
* Reworked by Sven Schuchmann <schuchmann@...leissheimer.de>
* DT support added by Clemens Gruber <clemens.gruber@...ruber.com>
*
- * This driver export the value of analog input voltage to sysfs, the
+ * This driver exports the value of analog input voltage to sysfs, the
* voltage unit is mV. Through the sysfs interface, lm-sensors tool
* can also display the input voltage.
*/
@@ -45,19 +45,29 @@ enum chips {
* Client data (each client gets its own)
*/
struct mcp3021_data {
- struct device *hwmon_dev;
+ struct i2c_client *client;
u32 vdd; /* supply and reference voltage in millivolt */
u16 sar_shift;
u16 sar_mask;
u8 output_res;
};
-static int mcp3021_read16(struct i2c_client *client)
+static inline u16 volts_from_reg(struct mcp3021_data *data, u16 val)
{
- struct mcp3021_data *data = i2c_get_clientdata(client);
- int ret;
- u16 reg;
+ return DIV_ROUND_CLOSEST(data->vdd * val, 1 << data->output_res);
+}
+
+static int mcp3021_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct mcp3021_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
__be16 buf;
+ u16 reg;
+ int ret;
+
+ if (type != hwmon_in)
+ return -EOPNOTSUPP;
ret = i2c_master_recv(client, (char *)&buf, 2);
if (ret < 0)
@@ -74,39 +84,46 @@ static int mcp3021_read16(struct i2c_client *client)
*/
reg = (reg >> data->sar_shift) & data->sar_mask;
- return reg;
-}
+ *val = volts_from_reg(data, reg);
-static inline u16 volts_from_reg(struct mcp3021_data *data, u16 val)
-{
- return DIV_ROUND_CLOSEST(data->vdd * val, 1 << data->output_res);
+ return 0;
}
-static ssize_t in0_input_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+static umode_t mcp3021_is_visible(const void *_data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct mcp3021_data *data = i2c_get_clientdata(client);
- int reg, in_input;
+ if (type != hwmon_in)
+ return 0;
- reg = mcp3021_read16(client);
- if (reg < 0)
- return reg;
+ if (attr != hwmon_in_input)
+ return 0;
- in_input = volts_from_reg(data, reg);
-
- return sprintf(buf, "%d\n", in_input);
+ return 0444;
}
-static DEVICE_ATTR_RO(in0_input);
+static const struct hwmon_channel_info *mcp3021_info[] = {
+ HWMON_CHANNEL_INFO(in, HWMON_I_INPUT),
+ NULL
+};
+
+static const struct hwmon_ops mcp3021_hwmon_ops = {
+ .is_visible = mcp3021_is_visible,
+ .read = mcp3021_read,
+};
+
+static const struct hwmon_chip_info mcp3021_chip_info = {
+ .ops = &mcp3021_hwmon_ops,
+ .info = mcp3021_info,
+};
static const struct i2c_device_id mcp3021_id[];
static int mcp3021_probe(struct i2c_client *client)
{
- int err;
struct mcp3021_data *data = NULL;
struct device_node *np = client->dev.of_node;
+ struct device *hwmon_dev;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
@@ -147,34 +164,17 @@ static int mcp3021_probe(struct i2c_client *client)
break;
}
+ data->client = client;
+
if (data->vdd > MCP3021_VDD_REF_MAX || data->vdd < MCP3021_VDD_REF_MIN)
return -EINVAL;
- err = sysfs_create_file(&client->dev.kobj, &dev_attr_in0_input.attr);
- if (err)
- return err;
-
- data->hwmon_dev = hwmon_device_register(&client->dev);
- if (IS_ERR(data->hwmon_dev)) {
- err = PTR_ERR(data->hwmon_dev);
- goto exit_remove;
- }
-
- return 0;
-
-exit_remove:
- sysfs_remove_file(&client->dev.kobj, &dev_attr_in0_input.attr);
- return err;
-}
-
-static int mcp3021_remove(struct i2c_client *client)
-{
- struct mcp3021_data *data = i2c_get_clientdata(client);
-
- hwmon_device_unregister(data->hwmon_dev);
- sysfs_remove_file(&client->dev.kobj, &dev_attr_in0_input.attr);
-
- return 0;
+ hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,
+ client->name,
+ data,
+ &mcp3021_chip_info,
+ NULL);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id mcp3021_id[] = {
@@ -199,7 +199,6 @@ static struct i2c_driver mcp3021_driver = {
.of_match_table = of_match_ptr(of_mcp3021_match),
},
.probe_new = mcp3021_probe,
- .remove = mcp3021_remove,
.id_table = mcp3021_id,
};
base-commit: 9f6ca00b5be47e471e9703e6b017e1e2cfa7f604
--
2.30.2
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