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path: root/drivers/hwmon/ltc4215.c
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Diffstat (limited to 'drivers/hwmon/ltc4215.c')
-rw-r--r--drivers/hwmon/ltc4215.c186
1 files changed, 51 insertions, 135 deletions
diff --git a/drivers/hwmon/ltc4215.c b/drivers/hwmon/ltc4215.c
index 9386e2a3921..c8a9bd9b050 100644
--- a/drivers/hwmon/ltc4215.c
+++ b/drivers/hwmon/ltc4215.c
@@ -19,11 +19,7 @@
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
-
-static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
-
-/* Insmod parameters */
-I2C_CLIENT_INSMOD_1(ltc4215);
+#include <linux/jiffies.h>
/* Here are names of the chip's registers (a.k.a. commands) */
enum ltc4215_cmd {
@@ -37,7 +33,7 @@ enum ltc4215_cmd {
};
struct ltc4215_data {
- struct device *hwmon_dev;
+ struct i2c_client *client;
struct mutex update_lock;
bool valid;
@@ -49,8 +45,8 @@ struct ltc4215_data {
static struct ltc4215_data *ltc4215_update_device(struct device *dev)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct ltc4215_data *data = i2c_get_clientdata(client);
+ struct ltc4215_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
s32 val;
int i;
@@ -96,8 +92,10 @@ static int ltc4215_get_voltage(struct device *dev, u8 reg)
voltage = regval * 605 / 10;
break;
case LTC4215_ADIN:
- /* The ADIN input is divided by 12.5, and has 4.82 mV
- * per increment, so we have the additional multiply */
+ /*
+ * The ADIN input is divided by 12.5, and has 4.82 mV
+ * per increment, so we have the additional multiply
+ */
voltage = regval * 482 * 125 / 1000;
break;
default:
@@ -114,7 +112,8 @@ static unsigned int ltc4215_get_current(struct device *dev)
{
struct ltc4215_data *data = ltc4215_update_device(dev);
- /* The strange looking conversions that follow are fixed-point
+ /*
+ * The strange looking conversions that follow are fixed-point
* math, since we cannot do floating point in the kernel.
*
* Step 1: convert sense register to microVolts
@@ -173,192 +172,109 @@ static ssize_t ltc4215_show_alarm(struct device *dev,
struct device_attribute *da,
char *buf)
{
- struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct ltc4215_data *data = ltc4215_update_device(dev);
- const u8 reg = data->regs[attr->index];
- const u32 mask = attr->nr;
+ const u8 reg = data->regs[LTC4215_STATUS];
+ const u32 mask = attr->index;
- return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0);
+ return snprintf(buf, PAGE_SIZE, "%u\n", !!(reg & mask));
}
-/* These macros are used below in constructing device attribute objects
+/*
+ * These macros are used below in constructing device attribute objects
* for use with sysfs_create_group() to make a sysfs device file
* for each register.
*/
-#define LTC4215_VOLTAGE(name, ltc4215_cmd_idx) \
- static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
- ltc4215_show_voltage, NULL, ltc4215_cmd_idx)
-
-#define LTC4215_CURRENT(name) \
- static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
- ltc4215_show_current, NULL, 0);
-
-#define LTC4215_POWER(name) \
- static SENSOR_DEVICE_ATTR(name, S_IRUGO, \
- ltc4215_show_power, NULL, 0);
-
-#define LTC4215_ALARM(name, mask, reg) \
- static SENSOR_DEVICE_ATTR_2(name, S_IRUGO, \
- ltc4215_show_alarm, NULL, (mask), reg)
-
/* Construct a sensor_device_attribute structure for each register */
/* Current */
-LTC4215_CURRENT(curr1_input);
-LTC4215_ALARM(curr1_max_alarm, (1 << 2), LTC4215_STATUS);
+static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc4215_show_current, NULL, 0);
+static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, ltc4215_show_alarm, NULL,
+ 1 << 2);
/* Power (virtual) */
-LTC4215_POWER(power1_input);
-LTC4215_ALARM(power1_alarm, (1 << 3), LTC4215_STATUS);
+static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc4215_show_power, NULL, 0);
/* Input Voltage */
-LTC4215_VOLTAGE(in1_input, LTC4215_ADIN);
-LTC4215_ALARM(in1_max_alarm, (1 << 0), LTC4215_STATUS);
-LTC4215_ALARM(in1_min_alarm, (1 << 1), LTC4215_STATUS);
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc4215_show_voltage, NULL,
+ LTC4215_ADIN);
+static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ltc4215_show_alarm, NULL,
+ 1 << 0);
+static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ltc4215_show_alarm, NULL,
+ 1 << 1);
/* Output Voltage */
-LTC4215_VOLTAGE(in2_input, LTC4215_SOURCE);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc4215_show_voltage, NULL,
+ LTC4215_SOURCE);
+static SENSOR_DEVICE_ATTR(in2_min_alarm, S_IRUGO, ltc4215_show_alarm, NULL,
+ 1 << 3);
-/* Finally, construct an array of pointers to members of the above objects,
+/*
+ * Finally, construct an array of pointers to members of the above objects,
* as required for sysfs_create_group()
*/
-static struct attribute *ltc4215_attributes[] = {
+static struct attribute *ltc4215_attrs[] = {
&sensor_dev_attr_curr1_input.dev_attr.attr,
&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
&sensor_dev_attr_power1_input.dev_attr.attr,
- &sensor_dev_attr_power1_alarm.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
+ &sensor_dev_attr_in2_min_alarm.dev_attr.attr,
NULL,
};
-
-static const struct attribute_group ltc4215_group = {
- .attrs = ltc4215_attributes,
-};
+ATTRIBUTE_GROUPS(ltc4215);
static int ltc4215_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
- struct ltc4215_data *data;
- int ret;
-
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data) {
- ret = -ENOMEM;
- goto out_kzalloc;
- }
-
- i2c_set_clientdata(client, data);
- mutex_init(&data->update_lock);
-
- /* Initialize the LTC4215 chip */
- /* TODO */
-
- /* Register sysfs hooks */
- ret = sysfs_create_group(&client->dev.kobj, &ltc4215_group);
- if (ret)
- goto out_sysfs_create_group;
-
- data->hwmon_dev = hwmon_device_register(&client->dev);
- if (IS_ERR(data->hwmon_dev)) {
- ret = PTR_ERR(data->hwmon_dev);
- goto out_hwmon_device_register;
- }
-
- return 0;
-
-out_hwmon_device_register:
- sysfs_remove_group(&client->dev.kobj, &ltc4215_group);
-out_sysfs_create_group:
- kfree(data);
-out_kzalloc:
- return ret;
-}
-
-static int ltc4215_remove(struct i2c_client *client)
-{
- struct ltc4215_data *data = i2c_get_clientdata(client);
-
- hwmon_device_unregister(data->hwmon_dev);
- sysfs_remove_group(&client->dev.kobj, &ltc4215_group);
-
- kfree(data);
-
- return 0;
-}
-
-static int ltc4215_detect(struct i2c_client *client,
- int kind,
- struct i2c_board_info *info)
-{
struct i2c_adapter *adapter = client->adapter;
+ struct device *dev = &client->dev;
+ struct ltc4215_data *data;
+ struct device *hwmon_dev;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
- if (kind < 0) { /* probed detection - check the chip type */
- s32 v; /* 8 bits from the chip, or -ERRNO */
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
- /*
- * Register 0x01 bit b7 is reserved, expect 0
- * Register 0x03 bit b6 and b7 are reserved, expect 0
- */
- v = i2c_smbus_read_byte_data(client, LTC4215_ALERT);
- if (v < 0 || (v & (1 << 7)) != 0)
- return -ENODEV;
-
- v = i2c_smbus_read_byte_data(client, LTC4215_FAULT);
- if (v < 0 || (v & ((1 << 6) | (1 << 7))) != 0)
- return -ENODEV;
- }
+ data->client = client;
+ mutex_init(&data->update_lock);
- strlcpy(info->type, "ltc4215", I2C_NAME_SIZE);
- dev_info(&adapter->dev, "ltc4215 %s at address 0x%02x\n",
- kind < 0 ? "probed" : "forced",
- client->addr);
+ /* Initialize the LTC4215 chip */
+ i2c_smbus_write_byte_data(client, LTC4215_FAULT, 0x00);
- return 0;
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+ data,
+ ltc4215_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id ltc4215_id[] = {
- { "ltc4215", ltc4215 },
+ { "ltc4215", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ltc4215_id);
/* This is the driver that will be inserted */
static struct i2c_driver ltc4215_driver = {
- .class = I2C_CLASS_HWMON,
.driver = {
.name = "ltc4215",
},
.probe = ltc4215_probe,
- .remove = ltc4215_remove,
.id_table = ltc4215_id,
- .detect = ltc4215_detect,
- .address_data = &addr_data,
};
-static int __init ltc4215_init(void)
-{
- return i2c_add_driver(&ltc4215_driver);
-}
-
-static void __exit ltc4215_exit(void)
-{
- i2c_del_driver(&ltc4215_driver);
-}
+module_i2c_driver(ltc4215_driver);
MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
MODULE_DESCRIPTION("LTC4215 driver");
MODULE_LICENSE("GPL");
-
-module_init(ltc4215_init);
-module_exit(ltc4215_exit);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-21 09:04:17 +0000