[PATCH] Adding a driver for the INA260 chip of Texas Instrument. It follows the hardware monitoring kernel API.

From: Loic Guegan
Date: Tue Aug 15 2023 - 06:43:36 EST

Signed-off-by: Loic Guegan <manzerbredes@xxxxxxxxxxx>
---
drivers/staging/Kconfig | 2 +
drivers/staging/Makefile | 1 +
drivers/staging/ina260/Kconfig | 6 +
drivers/staging/ina260/Makefile | 6 +
drivers/staging/ina260/TODO | 2 +
drivers/staging/ina260/ina260.c | 261 ++++++++++++++++++++++++++++++++
6 files changed, 278 insertions(+)
create mode 100644 drivers/staging/ina260/Kconfig
create mode 100644 drivers/staging/ina260/Makefile
create mode 100644 drivers/staging/ina260/TODO
create mode 100755 drivers/staging/ina260/ina260.c

diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index f9aef39ca..e173e4353 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -78,4 +78,6 @@ source "drivers/staging/qlge/Kconfig"

source "drivers/staging/vme_user/Kconfig"

+source "drivers/staging/ina260/Kconfig"
+
endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index ffa70dda4..a1d7e1ddb 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -28,3 +28,4 @@ obj-$(CONFIG_PI433) += pi433/
obj-$(CONFIG_XIL_AXIS_FIFO) += axis-fifo/
obj-$(CONFIG_FIELDBUS_DEV) += fieldbus/
obj-$(CONFIG_QLGE) += qlge/
+obj-$(CONFIG_INA260) += ina260/
\ No newline at end of file
diff --git a/drivers/staging/ina260/Kconfig b/drivers/staging/ina260/Kconfig
new file mode 100644
index 000000000..e873abc9d
--- /dev/null
+++ b/drivers/staging/ina260/Kconfig
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+config INA260
+ tristate "Support for INA260 Power Monitoring i2c chip"
+ depends on I2C && REGMAP_I2C
+ help
+ Support for the Texas Instrument INA260 power monitoring chip with precision integrated shunt.
diff --git a/drivers/staging/ina260/Makefile b/drivers/staging/ina260/Makefile
new file mode 100644
index 000000000..d4eeba95e
--- /dev/null
+++ b/drivers/staging/ina260/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Texas Instruments INA260 drivers
+#
+
+obj-$(CONFIG_INA260) += ina260.o
diff --git a/drivers/staging/ina260/TODO b/drivers/staging/ina260/TODO
new file mode 100644
index 000000000..2ed5b80c3
--- /dev/null
+++ b/drivers/staging/ina260/TODO
@@ -0,0 +1,2 @@
+Created on: 15 August 2023
+Contact: Loic GUEGAN <loic.guegan@xxxxxxxxxxx>
\ No newline at end of file
diff --git a/drivers/staging/ina260/ina260.c b/drivers/staging/ina260/ina260.c
new file mode 100755
index 000000000..f827236b8
--- /dev/null
+++ b/drivers/staging/ina260/ina260.c
@@ -0,0 +1,261 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Texas Instruments INA260 power monitor chip
+ * with precision integrated shunt.
+ * Datasheet: https://www.ti.com/lit/gpn/INA260
+ *
+ * Copyright (C) 2023 GUEGAN Loic <loic.guegan@xxxxxxxxxxx>
+ */
+
+#include "linux/module.h"
+#include "linux/uaccess.h"
+#include "linux/i2c.h"
+#include "linux/kobject.h"
+#include "linux/slab.h"
+#include "linux/kernel.h"
+#include <linux/sysfs.h>
+#include <linux/hwmon.h>
+#include <linux/regmap.h>
+
+// INA260 registers
+#define INA260_REG_CONFIGURATION 0x00
+#define INA260_REG_CURRENT 0x01
+#define INA260_REG_VOLTAGE 0x02
+#define INA260_REG_POWER 0x03
+#define INA260_REG_MASKENABLE 0x06
+#define INA260_REG_ALERTLIMIT 0x07
+#define INA260_REG_MANUFACTURER 0xFE
+#define INA260_REG_DIE 0xFF
+
+static struct regmap_config ina260_regmap_config = {
+ .max_register = INA260_REG_DIE,
+ .reg_bits = 8,
+ .val_bits = 16,
+};
+
+#define INA260_REG_SHOW(_attr, _reg) \
+static ssize_t _attr##_show(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ unsigned int rvalue; \
+ int err; \
+ struct client_data *cdata = dev_get_drvdata(dev); \
+ err = regmap_read(cdata->regmap, (_reg), &rvalue); \
+ if (err > 0) \
+ return err; \
+ return sprintf(buf, "0x%x\n", rvalue); \
+}
+
+#define INA260_REG_STORE(_attr, _reg) \
+static ssize_t _attr##_store(struct device *dev, struct device_attribute *attr, \
+const char *buf, size_t count) \
+{ \
+ int uvalue, err; \
+ struct client_data *cdata = dev_get_drvdata(dev); \
+ if (kstrtoint(buf, 0, &uvalue)) \
+ return -EINVAL; \
+ err = regmap_write(cdata->regmap, (_reg), uvalue); \
+ if (err > 0) \
+ return err; \
+ return count; \
+}
+
+/**
+ * @brief Embedded user data
+ */
+struct client_data {
+ struct i2c_client *client;
+ struct regmap *regmap;
+};
+
+static int ina260_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ int rvalue, reg, err, rem;
+ struct client_data *cdata = dev_get_drvdata(dev);
+
+ switch (type) {
+ case hwmon_power:
+ reg = INA260_REG_POWER;
+ break;
+ case hwmon_curr:
+ reg = INA260_REG_CURRENT;
+ break;
+ case hwmon_in:
+ reg = INA260_REG_VOLTAGE;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ err = regmap_read(cdata->regmap, reg, &rvalue);
+ if (err < 0)
+ return err;
+ else if (type == hwmon_power)
+ *val = rvalue * 10000;
+ else
+ *val = div_u64_rem(rvalue * 25, 100, &rem) + rvalue + div_u64(rem, 10);
+ return 0;
+}
+
+static int ina260_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ return -EOPNOTSUPP;
+}
+
+INA260_REG_SHOW(configuration, INA260_REG_CONFIGURATION)
+INA260_REG_SHOW(curr, INA260_REG_CURRENT)
+INA260_REG_SHOW(bus_voltage, INA260_REG_VOLTAGE)
+INA260_REG_SHOW(power, INA260_REG_POWER)
+INA260_REG_SHOW(mask_enable, INA260_REG_MASKENABLE)
+INA260_REG_SHOW(alert_limit, INA260_REG_ALERTLIMIT)
+INA260_REG_SHOW(manufacturer_id, INA260_REG_MANUFACTURER)
+INA260_REG_SHOW(die_id, INA260_REG_DIE)
+
+INA260_REG_STORE(configuration, INA260_REG_CONFIGURATION)
+INA260_REG_STORE(curr, INA260_REG_CURRENT)
+INA260_REG_STORE(bus_voltage, INA260_REG_VOLTAGE)
+INA260_REG_STORE(power, INA260_REG_POWER)
+INA260_REG_STORE(mask_enable, INA260_REG_MASKENABLE)
+INA260_REG_STORE(alert_limit, INA260_REG_ALERTLIMIT)
+
+static umode_t ina260_hwmon_is_visible(const void *drvdata,
+ enum hwmon_sensor_types type, u32 attr, int channel)
+{
+ switch (type) {
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ return 0444;
+ default:
+ return 0;
+ }
+ case hwmon_curr:
+ switch (attr) {
+ case hwmon_curr_input:
+ return 0444;
+ default:
+ return 0;
+ }
+ case hwmon_power:
+ switch (attr) {
+ case hwmon_power_input:
+ return 0444;
+ default:
+ return 0;
+ }
+ default:
+ return 0;
+ }
+}
+
+static const struct hwmon_channel_info *ina260_hwmon_info[] = {
+ HWMON_CHANNEL_INFO(in, HWMON_I_INPUT),
+ HWMON_CHANNEL_INFO(power, HWMON_P_INPUT),
+ HWMON_CHANNEL_INFO(curr, HWMON_C_INPUT),
+ NULL
+};
+
+static const struct hwmon_ops ina260_hwmon_ops = {
+ .is_visible = ina260_hwmon_is_visible,
+ .read = ina260_hwmon_read,
+ .write = ina260_hwmon_write,
+};
+
+static const struct hwmon_chip_info ina260_chip_info = {
+ .ops = &ina260_hwmon_ops,
+ .info = ina260_hwmon_info,
+};
+
+// ----- Registers -----
+static DEVICE_ATTR_RW(configuration);
+static DEVICE_ATTR_RW(curr);
+static DEVICE_ATTR_RW(bus_voltage);
+static DEVICE_ATTR_RW(power);
+static DEVICE_ATTR_RW(mask_enable);
+static DEVICE_ATTR_RW(alert_limit);
+static DEVICE_ATTR_RO(manufacturer_id);
+static DEVICE_ATTR_RO(die_id);
+static struct attribute *registers_attrs[] = {
+ &dev_attr_configuration.attr,
+ &dev_attr_curr.attr,
+ &dev_attr_bus_voltage.attr,
+ &dev_attr_power.attr,
+ &dev_attr_mask_enable.attr,
+ &dev_attr_alert_limit.attr,
+ &dev_attr_manufacturer_id.attr,
+ &dev_attr_die_id.attr,
+ NULL,
+};
+
+static const struct attribute_group registers_group = {
+ .attrs = registers_attrs,
+ .name = "registers"
+};
+
+const struct attribute_group *extra_groups[] = {
+ &registers_group,
+ NULL
+};
+
+static int ina260_probe_new(struct i2c_client *client)
+{
+ struct client_data *p;
+ struct device *hwmon_dev;
+
+ // Initialize client data:
+ dev_dbg(&client->dev, "Adding ina260 [bus=%d address=0x%02x]\n",
+ client->adapter->nr, client->addr);
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ p->client = client;
+ p->regmap = devm_regmap_init_i2c(client, &ina260_regmap_config);
+
+ hwmon_dev = hwmon_device_register_with_info(&client->dev, client->name, p,
+ &ina260_chip_info, extra_groups);
+ if (IS_ERR(hwmon_dev))
+ return PTR_ERR(hwmon_dev);
+ return 0;
+}
+
+static void ina260_remove(struct i2c_client *client)
+{
+ struct client_data *p = i2c_get_clientdata(client);
+
+ kfree(p);
+ hwmon_device_unregister(&client->dev);
+ dev_dbg(&client->dev, "Removing ina260 [bus=%d address=0x%02x]\n",
+ client->adapter->nr, client->addr);
+}
+
+static const struct i2c_device_id ina260_ids[] = {
+ { "ina260", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ina260_ids);
+
+static struct i2c_driver ina260_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "ina260"
+ },
+ .probe_new = ina260_probe_new,
+ .remove = ina260_remove,
+ .id_table = ina260_ids
+};
+
+static int __init ina260_init(void)
+{
+ i2c_add_driver(&ina260_driver);
+ return 0;
+}
+
+static void __exit ina260_exit(void)
+{
+ i2c_del_driver(&ina260_driver);
+}
+
+module_init(ina260_init);
+module_exit(ina260_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Loïc Guegan");
+MODULE_DESCRIPTION("INA260 Texas Instruments");
+MODULE_VERSION("1.0");
--
2.41.0

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