* [PATCH v2 1/3] dt-bindings: hwmon: Add TI TPS23861 bindings
@ 2020-12-19 19:11 Robert Marko
2020-12-19 19:11 ` [PATCH v2 2/3] hwmon: add Texas Instruments TPS23861 driver Robert Marko
2020-12-19 19:11 ` [PATCH v2 3/3] MAINTAINERS: Add entry for Texas Instruments TPS23861 PoE PSE Robert Marko
0 siblings, 2 replies; 5+ messages in thread
From: Robert Marko @ 2020-12-19 19:11 UTC (permalink / raw)
To: jdelvare, robh+dt, linux-hwmon, devicetree, linux-kernel
Cc: Robert Marko, Luka Perkov
Document bindings for the Texas Instruments TPS23861 driver.
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
---
.../bindings/hwmon/ti,tps23861.yaml | 53 +++++++++++++++++++
1 file changed, 53 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwmon/ti,tps23861.yaml
diff --git a/Documentation/devicetree/bindings/hwmon/ti,tps23861.yaml b/Documentation/devicetree/bindings/hwmon/ti,tps23861.yaml
new file mode 100644
index 000000000000..a7a801f54398
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/ti,tps23861.yaml
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/ti,tps23861.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI TPS23861 PoE PSE
+
+maintainers:
+ - Robert Marko <robert.marko@sartura.hr>
+
+description: |
+ The TPS23861 is a IEEE 802.3at Quad Port Power-over-Ethernet PSE Controller.
+
+ Datasheets:
+ https://www.ti.com/lit/gpn/tps23861
+
+
+properties:
+ compatible:
+ enum:
+ - ti,tps23861
+
+ reg:
+ maxItems: 1
+
+ shunt-resistor-micro-ohms:
+ description: |
+ The value of curent sense resistor in microohms.
+ items:
+ default: 255000
+ minimum: 250000
+ maximum: 255000
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ tps23861@30 {
+ compatible = "ti,tps23861";
+ reg = <0x30>;
+ shunt-resistor-micro-ohms = <255000>;
+ };
+ };
--
2.29.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 2/3] hwmon: add Texas Instruments TPS23861 driver
2020-12-19 19:11 [PATCH v2 1/3] dt-bindings: hwmon: Add TI TPS23861 bindings Robert Marko
@ 2020-12-19 19:11 ` Robert Marko
2020-12-21 16:26 ` Guenter Roeck
2020-12-19 19:11 ` [PATCH v2 3/3] MAINTAINERS: Add entry for Texas Instruments TPS23861 PoE PSE Robert Marko
1 sibling, 1 reply; 5+ messages in thread
From: Robert Marko @ 2020-12-19 19:11 UTC (permalink / raw)
To: jdelvare, robh+dt, linux-hwmon, devicetree, linux-kernel
Cc: Robert Marko, Luka Perkov
Add basic monitoring support as well as port on/off control for Texas
Instruments TPS23861 PoE PSE IC.
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
---
Changes in v2:
* Convert to devm_hwmon_device_register_with_info()
* Change license
drivers/hwmon/Kconfig | 11 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/tps23861.c | 538 +++++++++++++++++++++++++++++++++++++++
3 files changed, 550 insertions(+)
create mode 100644 drivers/hwmon/tps23861.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index a850e4f0e0bd..3368ecfa7a9c 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1102,6 +1102,17 @@ config SENSORS_TC654
This driver can also be built as a module. If so, the module
will be called tc654.
+config SENSORS_TPS23861
+ tristate "Texas Instruments TPS23861 PoE PSE"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ If you say yes here you get support for Texas Instruments
+ TPS23861 802.3at PoE PSE chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called tps23861.
+
config SENSORS_MENF21BMC_HWMON
tristate "MEN 14F021P00 BMC Hardware Monitoring"
depends on MFD_MENF21BMC
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 9db2903b61e5..7493e9d5dc43 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -141,6 +141,7 @@ obj-$(CONFIG_SENSORS_MAX31790) += max31790.o
obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
obj-$(CONFIG_SENSORS_TC654) += tc654.o
+obj-$(CONFIG_SENSORS_TPS23861) += tps23861.o
obj-$(CONFIG_SENSORS_MLXREG_FAN) += mlxreg-fan.o
obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
obj-$(CONFIG_SENSORS_MR75203) += mr75203.o
diff --git a/drivers/hwmon/tps23861.c b/drivers/hwmon/tps23861.c
new file mode 100644
index 000000000000..2bb804ccdc8e
--- /dev/null
+++ b/drivers/hwmon/tps23861.c
@@ -0,0 +1,538 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Sartura Ltd.
+ *
+ * Driver for the TI TPS23861 PoE PSE.
+ *
+ * Author: Robert Marko <robert.marko@sartura.hr>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+#define TEMPERATURE 0x2c
+#define INPUT_VOLTAGE_LSB 0x2e
+#define INPUT_VOLTAGE_MSB 0x2f
+#define PORT_1_CURRENT_LSB 0x30
+#define PORT_1_CURRENT_MSB 0x31
+#define PORT_1_VOLTAGE_LSB 0x32
+#define PORT_1_VOLTAGE_MSB 0x33
+#define PORT_2_CURRENT_LSB 0x34
+#define PORT_2_CURRENT_MSB 0x35
+#define PORT_2_VOLTAGE_LSB 0x36
+#define PORT_2_VOLTAGE_MSB 0x37
+#define PORT_3_CURRENT_LSB 0x38
+#define PORT_3_CURRENT_MSB 0x39
+#define PORT_3_VOLTAGE_LSB 0x3a
+#define PORT_3_VOLTAGE_MSB 0x3b
+#define PORT_4_CURRENT_LSB 0x3c
+#define PORT_4_CURRENT_MSB 0x3d
+#define PORT_4_VOLTAGE_LSB 0x3e
+#define PORT_4_VOLTAGE_MSB 0x3f
+#define PORT_N_CURRENT_LSB_OFFSET 0x04
+#define PORT_N_VOLTAGE_LSB_OFFSET 0x04
+#define VOLTAGE_CURRENT_MASK GENMASK(13, 0)
+#define PORT_1_STATUS 0x0c
+#define PORT_2_STATUS 0x0d
+#define PORT_3_STATUS 0x0e
+#define PORT_4_STATUS 0x0f
+#define PORT_STATUS_CLASS_MASK GENMASK(7, 4)
+#define PORT_STATUS_DETECT_MASK GENMASK(3, 0)
+#define PORT_CLASS_UNKNOWN 0
+#define PORT_CLASS_1 1
+#define PORT_CLASS_2 2
+#define PORT_CLASS_3 3
+#define PORT_CLASS_4 4
+#define PORT_CLASS_RESERVED 5
+#define PORT_CLASS_0 6
+#define PORT_CLASS_OVERCURRENT 7
+#define PORT_CLASS_MISMATCH 8
+#define PORT_DETECT_UNKNOWN 0
+#define PORT_DETECT_SHORT 1
+#define PORT_DETECT_RESERVED 2
+#define PORT_DETECT_RESISTANCE_LOW 3
+#define PORT_DETECT_RESISTANCE_OK 4
+#define PORT_DETECT_RESISTANCE_HIGH 5
+#define PORT_DETECT_OPEN_CIRCUIT 6
+#define PORT_DETECT_RESERVED_2 7
+#define PORT_DETECT_MOSFET_FAULT 8
+#define PORT_DETECT_LEGACY 9
+/* Measurment beyond clamp voltage */
+#define PORT_DETECT_CAPACITANCE_INVALID_BEYOND 10
+/* Insufficient voltage delta */
+#define PORT_DETECT_CAPACITANCE_INVALID_DELTA 11
+#define PORT_DETECT_CAPACITANCE_OUT_OF_RANGE 12
+#define POE_PLUS 0x40
+
+#define DETECT_CLASS_RESTART 0x18
+#define POWER_ENABLE 0x19
+
+#define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */
+#define VOLTAGE_LSB 3662 /* 3.662 mV */
+#define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */
+#define CURRENT_LSB_255 62260 /* 62.260 uA */
+#define CURRENT_LSB_250 61039 /* 61.039 uA */
+
+struct tps23861_data {
+ struct regmap *regmap;
+ u32 shunt_resistor;
+};
+
+static struct regmap_config tps23861_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int tps23861_read_temp(struct tps23861_data *data, long *val)
+{
+ unsigned int regval;
+ int err;
+
+ err = regmap_read(data->regmap, TEMPERATURE, ®val);
+ if (err < 0)
+ return err;
+
+ *val = (regval * TEMPERATURE_LSB) - 20000;
+
+ return 0;
+}
+
+static int tps23861_read_voltage(struct tps23861_data *data, int channel,
+ long *val)
+{
+ unsigned int regval;
+ int err;
+
+ if (channel < 4) {
+ err = regmap_bulk_read(data->regmap,
+ PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET,
+ ®val, 2);
+ } else {
+ err = regmap_bulk_read(data->regmap,
+ INPUT_VOLTAGE_LSB,
+ ®val, 2);
+ }
+ if (err < 0)
+ return err;
+
+ *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000;
+
+ return 0;
+}
+
+static int tps23861_read_current(struct tps23861_data *data, int channel,
+ long *val)
+{
+ unsigned int current_lsb;
+ unsigned int regval;
+ int err;
+
+ if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
+ current_lsb = CURRENT_LSB_255;
+ else
+ current_lsb = CURRENT_LSB_250;
+
+ err = regmap_bulk_read(data->regmap,
+ PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET,
+ ®val, 2);
+ if (err < 0)
+ return err;
+
+ *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000;
+
+ return 0;
+}
+
+static int tps23861_calculate_power(struct tps23861_data *data, int channel,
+ long *val)
+{
+ long voltage, current_ma;
+ int err;
+
+ err = tps23861_read_voltage(data, channel, &voltage);
+ if (err < 0)
+ return err;
+
+ err = tps23861_read_current(data, channel, ¤t_ma);
+ if (err < 0)
+ return err;
+
+ *val = voltage * current_ma;
+
+ return 0;
+}
+
+static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ return 0444;
+ }
+ break;
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ case hwmon_in_label:
+ return 0444;
+ }
+ break;
+ case hwmon_curr:
+ switch (attr) {
+ case hwmon_curr_input:
+ case hwmon_curr_label:
+ return 0444;
+ }
+ break;
+ case hwmon_power:
+ switch (attr) {
+ case hwmon_power_input:
+ case hwmon_power_label:
+ return 0444;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int tps23861_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct tps23861_data *data = dev_get_drvdata(dev);
+ int err;
+
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ err = tps23861_read_temp(data, val);
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ err = tps23861_read_voltage(data, channel, val);
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case hwmon_curr:
+ switch (attr) {
+ case hwmon_curr_input:
+ err = tps23861_read_current(data, channel, val);
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case hwmon_power:
+ switch (attr) {
+ case hwmon_power_input:
+ err = tps23861_calculate_power(data, channel, val);
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return err;
+}
+
+static const char * const tps23861_port_label[] = {
+ "Port1",
+ "Port2",
+ "Port3",
+ "Port4",
+ "Input",
+};
+
+static int tps23861_read_string(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel, const char **str)
+{
+ switch (type) {
+ case hwmon_in:
+ case hwmon_curr:
+ case hwmon_power:
+ *str = tps23861_port_label[channel];
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ return 0;
+}
+
+static const struct hwmon_channel_info *tps23861_info[] = {
+ HWMON_CHANNEL_INFO(chip,
+ HWMON_C_REGISTER_TZ),
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT),
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL),
+ HWMON_CHANNEL_INFO(curr,
+ HWMON_C_INPUT | HWMON_C_LABEL,
+ HWMON_C_INPUT | HWMON_C_LABEL,
+ HWMON_C_INPUT | HWMON_C_LABEL,
+ HWMON_C_INPUT | HWMON_C_LABEL),
+ HWMON_CHANNEL_INFO(power,
+ HWMON_P_INPUT | HWMON_P_LABEL,
+ HWMON_P_INPUT | HWMON_P_LABEL,
+ HWMON_P_INPUT | HWMON_P_LABEL,
+ HWMON_P_INPUT | HWMON_P_LABEL),
+ NULL
+};
+
+static const struct hwmon_ops tps23861_hwmon_ops = {
+ .is_visible = tps23861_is_visible,
+ .read = tps23861_read,
+ .read_string = tps23861_read_string,
+};
+
+static const struct hwmon_chip_info tps23861_chip_info = {
+ .ops = &tps23861_hwmon_ops,
+ .info = tps23861_info,
+};
+
+static ssize_t tps23861_port_status_show(struct device *dev,
+ struct device_attribute *da,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct tps23861_data *data = dev_get_drvdata(dev);
+ char *detect_status, *class_status;
+ unsigned int regval;
+ u8 class, detect;
+
+ regmap_read(data->regmap, attr->index, ®val);
+ detect = FIELD_GET(PORT_STATUS_DETECT_MASK, regval);
+ class = FIELD_GET(PORT_STATUS_CLASS_MASK, regval);
+
+ switch (detect) {
+ case PORT_DETECT_UNKNOWN:
+ detect_status = "Unknown device";
+ break;
+ case PORT_DETECT_SHORT:
+ detect_status = "Short circuit detected";
+ break;
+ case PORT_DETECT_RESISTANCE_LOW:
+ detect_status = "Too low resistance detected";
+ break;
+ case PORT_DETECT_RESISTANCE_OK:
+ detect_status = "Valid resistance detected";
+ break;
+ case PORT_DETECT_RESISTANCE_HIGH:
+ detect_status = "Too high resistance detected";
+ break;
+ case PORT_DETECT_OPEN_CIRCUIT:
+ detect_status = "Open circuit detected";
+ break;
+ case PORT_DETECT_MOSFET_FAULT:
+ detect_status = "MOSFET fault detected";
+ break;
+ case PORT_DETECT_LEGACY:
+ detect_status = "Legacy device detected";
+ break;
+ case PORT_DETECT_CAPACITANCE_INVALID_BEYOND:
+ detect_status = "Invalid capacitance, beyond clamp voltage";
+ break;
+ case PORT_DETECT_CAPACITANCE_INVALID_DELTA:
+ detect_status = "Invalid capacitance, insufficient voltage delta";
+ break;
+ case PORT_DETECT_CAPACITANCE_OUT_OF_RANGE:
+ detect_status = "Valid capacitance, outside of legacy range";
+ break;
+ case PORT_DETECT_RESERVED:
+ case PORT_DETECT_RESERVED_2:
+ default:
+ return -EINVAL;
+ }
+
+ switch (class) {
+ case PORT_CLASS_UNKNOWN:
+ class_status = "Unknown class";
+ break;
+ case PORT_CLASS_RESERVED:
+ case PORT_CLASS_0:
+ class_status = "Class 0";
+ break;
+ case PORT_CLASS_1:
+ class_status = "Class 1";
+ break;
+ case PORT_CLASS_2:
+ class_status = "Class 2";
+ break;
+ case PORT_CLASS_3:
+ class_status = "Class 3";
+ break;
+ case PORT_CLASS_4:
+ class_status = "Class 4";
+ break;
+ case PORT_CLASS_OVERCURRENT:
+ class_status = "Overcurrent";
+ break;
+ case PORT_CLASS_MISMATCH:
+ class_status = "Class mismatch";
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return snprintf(buf, PAGE_SIZE, "%s, %s\n", detect_status, class_status);
+}
+
+static ssize_t tps23861_poe_plus_show(struct device *dev,
+ struct device_attribute *da,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct tps23861_data *data = dev_get_drvdata(dev);
+ char *ports[4];
+ unsigned int regval;
+ int i;
+
+ regmap_read(data->regmap, attr->index, ®val);
+
+ for (i = 0; i < 4; i++) {
+ if (BIT(i + 4) & regval)
+ ports[i] = "Yes";
+ else
+ ports[i] = "No";
+ }
+
+ return snprintf(buf, PAGE_SIZE, "Port 1: %s\nPort 2: %s\nPort 3: %s\nPort 4: %s\n",
+ ports[0], ports[1], ports[2], ports[3]);
+}
+
+static ssize_t tps23861_port_disable_store(struct device *dev,
+ struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct tps23861_data *data = dev_get_drvdata(dev);
+ unsigned int regval, port;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &port);
+ if (ret < 0)
+ return ret;
+
+ regmap_read(data->regmap, attr->index, ®val);
+ regval |= BIT(port + 3);
+ regmap_write(data->regmap, attr->index, regval);
+
+ return count;
+}
+
+static ssize_t tps23861_port_enable_store(struct device *dev,
+ struct device_attribute *da,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct tps23861_data *data = dev_get_drvdata(dev);
+ unsigned int regval, port;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &port);
+ if (ret < 0)
+ return ret;
+
+ regmap_read(data->regmap, attr->index, ®val);
+ regval |= BIT(port - 1);
+ regval |= BIT(port + 3);
+ regmap_write(data->regmap, attr->index, regval);
+
+ return count;
+}
+
+static SENSOR_DEVICE_ATTR_RO(port1_status, tps23861_port_status, PORT_1_STATUS);
+static SENSOR_DEVICE_ATTR_RO(port2_status, tps23861_port_status, PORT_2_STATUS);
+static SENSOR_DEVICE_ATTR_RO(port3_status, tps23861_port_status, PORT_3_STATUS);
+static SENSOR_DEVICE_ATTR_RO(port4_status, tps23861_port_status, PORT_4_STATUS);
+static SENSOR_DEVICE_ATTR_RO(poe_plus_status, tps23861_poe_plus, POE_PLUS);
+static SENSOR_DEVICE_ATTR_WO(port_disable, tps23861_port_disable, POWER_ENABLE);
+static SENSOR_DEVICE_ATTR_WO(port_enable, tps23861_port_enable, DETECT_CLASS_RESTART);
+
+static struct attribute *tps23861_attrs[] = {
+ &sensor_dev_attr_port1_status.dev_attr.attr,
+ &sensor_dev_attr_port2_status.dev_attr.attr,
+ &sensor_dev_attr_port3_status.dev_attr.attr,
+ &sensor_dev_attr_port4_status.dev_attr.attr,
+ &sensor_dev_attr_poe_plus_status.dev_attr.attr,
+ &sensor_dev_attr_port_disable.dev_attr.attr,
+ &sensor_dev_attr_port_enable.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group tps23861_group = {
+ .attrs = tps23861_attrs,
+};
+__ATTRIBUTE_GROUPS(tps23861);
+
+static int tps23861_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct tps23861_data *data;
+ struct device *hwmon_dev;
+ u32 shunt_resistor;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->regmap = devm_regmap_init_i2c(client, &tps23861_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ dev_err(dev, "failed to allocate register map\n");
+ return PTR_ERR(data->regmap);
+ }
+
+ if (of_property_read_u32(dev->of_node, "shunt-resistor-micro-ohms", &shunt_resistor) < 0)
+ data->shunt_resistor = shunt_resistor;
+ else
+ data->shunt_resistor = SHUNT_RESISTOR_DEFAULT;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+ data, &tps23861_chip_info,
+ tps23861_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct of_device_id __maybe_unused tps23861_of_match[] = {
+ { .compatible = "ti,tps23861", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tps23861_of_match);
+
+static struct i2c_driver tps23861_driver = {
+ .probe_new = tps23861_probe,
+ .driver = {
+ .name = "tps23861",
+ .of_match_table = of_match_ptr(tps23861_of_match),
+ },
+};
+module_i2c_driver(tps23861_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
+MODULE_DESCRIPTION("TI TPS23861 PoE PSE");
--
2.29.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 3/3] MAINTAINERS: Add entry for Texas Instruments TPS23861 PoE PSE
2020-12-19 19:11 [PATCH v2 1/3] dt-bindings: hwmon: Add TI TPS23861 bindings Robert Marko
2020-12-19 19:11 ` [PATCH v2 2/3] hwmon: add Texas Instruments TPS23861 driver Robert Marko
@ 2020-12-19 19:11 ` Robert Marko
1 sibling, 0 replies; 5+ messages in thread
From: Robert Marko @ 2020-12-19 19:11 UTC (permalink / raw)
To: jdelvare, robh+dt, linux-hwmon, devicetree, linux-kernel
Cc: Robert Marko, Luka Perkov
Add maintainers entry for the Texas Instruments TPS23861 PoE PSE driver.
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
---
MAINTAINERS | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 830244166a7c..5441be7a5c26 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17336,6 +17336,14 @@ F: include/dt-bindings/soc/ti,sci_pm_domain.h
F: include/linux/soc/ti/ti_sci_inta_msi.h
F: include/linux/soc/ti/ti_sci_protocol.h
+TEXAS INSTRUMENTS TPS23861 PoE PSE DRIVER
+M: Robert Marko <robert.marko@sartura.hr>
+M: Luka Perkov <luka.perkov@sartura.hr>
+L: linux-hwmon@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/hwmon/ti,tps23861.yaml
+F: drivers/hwmon/tps23861.c
+
THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER
M: Hans Verkuil <hverkuil@xs4all.nl>
L: linux-media@vger.kernel.org
--
2.29.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 2/3] hwmon: add Texas Instruments TPS23861 driver
2020-12-19 19:11 ` [PATCH v2 2/3] hwmon: add Texas Instruments TPS23861 driver Robert Marko
@ 2020-12-21 16:26 ` Guenter Roeck
2020-12-22 14:31 ` Robert Marko
0 siblings, 1 reply; 5+ messages in thread
From: Guenter Roeck @ 2020-12-21 16:26 UTC (permalink / raw)
To: Robert Marko, jdelvare, robh+dt, linux-hwmon, devicetree, linux-kernel
Cc: Luka Perkov
On 12/19/20 11:11 AM, Robert Marko wrote:
> Add basic monitoring support as well as port on/off control for Texas
> Instruments TPS23861 PoE PSE IC.
>
> Signed-off-by: Robert Marko <robert.marko@sartura.hr>
> Cc: Luka Perkov <luka.perkov@sartura.hr>
> ---
> Changes in v2:
> * Convert to devm_hwmon_device_register_with_info()
> * Change license
>
> drivers/hwmon/Kconfig | 11 +
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/tps23861.c | 538 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 550 insertions(+)
> create mode 100644 drivers/hwmon/tps23861.c
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index a850e4f0e0bd..3368ecfa7a9c 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1102,6 +1102,17 @@ config SENSORS_TC654
> This driver can also be built as a module. If so, the module
> will be called tc654.
>
> +config SENSORS_TPS23861
> + tristate "Texas Instruments TPS23861 PoE PSE"
> + depends on I2C
> + select REGMAP_I2C
> + help
> + If you say yes here you get support for Texas Instruments
> + TPS23861 802.3at PoE PSE chips.
> +
> + This driver can also be built as a module. If so, the module
> + will be called tps23861.
> +
> config SENSORS_MENF21BMC_HWMON
> tristate "MEN 14F021P00 BMC Hardware Monitoring"
> depends on MFD_MENF21BMC
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 9db2903b61e5..7493e9d5dc43 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -141,6 +141,7 @@ obj-$(CONFIG_SENSORS_MAX31790) += max31790.o
> obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
> obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
> obj-$(CONFIG_SENSORS_TC654) += tc654.o
> +obj-$(CONFIG_SENSORS_TPS23861) += tps23861.o
> obj-$(CONFIG_SENSORS_MLXREG_FAN) += mlxreg-fan.o
> obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
> obj-$(CONFIG_SENSORS_MR75203) += mr75203.o
> diff --git a/drivers/hwmon/tps23861.c b/drivers/hwmon/tps23861.c
> new file mode 100644
> index 000000000000..2bb804ccdc8e
> --- /dev/null
> +++ b/drivers/hwmon/tps23861.c
> @@ -0,0 +1,538 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2020 Sartura Ltd.
> + *
> + * Driver for the TI TPS23861 PoE PSE.
> + *
> + * Author: Robert Marko <robert.marko@sartura.hr>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/delay.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/hwmon.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/regmap.h>
> +
> +#define TEMPERATURE 0x2c
> +#define INPUT_VOLTAGE_LSB 0x2e
> +#define INPUT_VOLTAGE_MSB 0x2f
> +#define PORT_1_CURRENT_LSB 0x30
> +#define PORT_1_CURRENT_MSB 0x31
> +#define PORT_1_VOLTAGE_LSB 0x32
> +#define PORT_1_VOLTAGE_MSB 0x33
> +#define PORT_2_CURRENT_LSB 0x34
> +#define PORT_2_CURRENT_MSB 0x35
> +#define PORT_2_VOLTAGE_LSB 0x36
> +#define PORT_2_VOLTAGE_MSB 0x37
> +#define PORT_3_CURRENT_LSB 0x38
> +#define PORT_3_CURRENT_MSB 0x39
> +#define PORT_3_VOLTAGE_LSB 0x3a
> +#define PORT_3_VOLTAGE_MSB 0x3b
> +#define PORT_4_CURRENT_LSB 0x3c
> +#define PORT_4_CURRENT_MSB 0x3d
> +#define PORT_4_VOLTAGE_LSB 0x3e
> +#define PORT_4_VOLTAGE_MSB 0x3f
> +#define PORT_N_CURRENT_LSB_OFFSET 0x04
> +#define PORT_N_VOLTAGE_LSB_OFFSET 0x04
> +#define VOLTAGE_CURRENT_MASK GENMASK(13, 0)
> +#define PORT_1_STATUS 0x0c
> +#define PORT_2_STATUS 0x0d
> +#define PORT_3_STATUS 0x0e
> +#define PORT_4_STATUS 0x0f
> +#define PORT_STATUS_CLASS_MASK GENMASK(7, 4)
> +#define PORT_STATUS_DETECT_MASK GENMASK(3, 0)
> +#define PORT_CLASS_UNKNOWN 0
> +#define PORT_CLASS_1 1
> +#define PORT_CLASS_2 2
> +#define PORT_CLASS_3 3
> +#define PORT_CLASS_4 4
> +#define PORT_CLASS_RESERVED 5
> +#define PORT_CLASS_0 6
> +#define PORT_CLASS_OVERCURRENT 7
> +#define PORT_CLASS_MISMATCH 8
> +#define PORT_DETECT_UNKNOWN 0
> +#define PORT_DETECT_SHORT 1
> +#define PORT_DETECT_RESERVED 2
> +#define PORT_DETECT_RESISTANCE_LOW 3
> +#define PORT_DETECT_RESISTANCE_OK 4
> +#define PORT_DETECT_RESISTANCE_HIGH 5
> +#define PORT_DETECT_OPEN_CIRCUIT 6
> +#define PORT_DETECT_RESERVED_2 7
> +#define PORT_DETECT_MOSFET_FAULT 8
> +#define PORT_DETECT_LEGACY 9
> +/* Measurment beyond clamp voltage */
> +#define PORT_DETECT_CAPACITANCE_INVALID_BEYOND 10
> +/* Insufficient voltage delta */
> +#define PORT_DETECT_CAPACITANCE_INVALID_DELTA 11
> +#define PORT_DETECT_CAPACITANCE_OUT_OF_RANGE 12
> +#define POE_PLUS 0x40
> +
> +#define DETECT_CLASS_RESTART 0x18
> +#define POWER_ENABLE 0x19
> +
> +#define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */
> +#define VOLTAGE_LSB 3662 /* 3.662 mV */
> +#define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */
> +#define CURRENT_LSB_255 62260 /* 62.260 uA */
> +#define CURRENT_LSB_250 61039 /* 61.039 uA */
> +
> +struct tps23861_data {
> + struct regmap *regmap;
> + u32 shunt_resistor;
> +};
> +
> +static struct regmap_config tps23861_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +};
> +
> +static int tps23861_read_temp(struct tps23861_data *data, long *val)
> +{
> + unsigned int regval;
> + int err;
> +
> + err = regmap_read(data->regmap, TEMPERATURE, ®val);
> + if (err < 0)
> + return err;
> +
> + *val = (regval * TEMPERATURE_LSB) - 20000;
> +
> + return 0;
> +}
> +
> +static int tps23861_read_voltage(struct tps23861_data *data, int channel,
> + long *val)
> +{
> + unsigned int regval;
> + int err;
> +
> + if (channel < 4) {
> + err = regmap_bulk_read(data->regmap,
> + PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET,
> + ®val, 2);
> + } else {
> + err = regmap_bulk_read(data->regmap,
> + INPUT_VOLTAGE_LSB,
> + ®val, 2);
> + }
> + if (err < 0)
> + return err;
> +
> + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000;
> +
> + return 0;
> +}
> +
> +static int tps23861_read_current(struct tps23861_data *data, int channel,
> + long *val)
> +{
> + unsigned int current_lsb;
> + unsigned int regval;
> + int err;
> +
> + if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
> + current_lsb = CURRENT_LSB_255;
> + else
> + current_lsb = CURRENT_LSB_250;
> +
> + err = regmap_bulk_read(data->regmap,
> + PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET,
> + ®val, 2);
> + if (err < 0)
> + return err;
> +
> + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000;
> +
> + return 0;
> +}
> +
> +static int tps23861_calculate_power(struct tps23861_data *data, int channel,
> + long *val)
> +{
> + long voltage, current_ma;
> + int err;
> +
> + err = tps23861_read_voltage(data, channel, &voltage);
> + if (err < 0)
> + return err;
> +
> + err = tps23861_read_current(data, channel, ¤t_ma);
> + if (err < 0)
> + return err;
> +
It is not the responsibility of the kernel to calculate power values.
This can and should be done in userspace. Kenrel power attributes are
only appropriate if reported by the hardware.
> + *val = voltage * current_ma;
> +
> + return 0;
> +}
> +
> +static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + switch (type) {
> + case hwmon_temp:
> + switch (attr) {
> + case hwmon_temp_input:
> + return 0444;
default: missing. Same below.
> + }
> + break;
> + case hwmon_in:
> + switch (attr) {
> + case hwmon_in_input:
> + case hwmon_in_label:
> + return 0444;
> + }
> + break;
> + case hwmon_curr:
> + switch (attr) {
> + case hwmon_curr_input:
> + case hwmon_curr_label:
> + return 0444;
> + }
> + break;
> + case hwmon_power:
> + switch (attr) {
> + case hwmon_power_input:
> + case hwmon_power_label:
> + return 0444;
> + }
> + break;
> + default:
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int tps23861_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *val)
> +{
> + struct tps23861_data *data = dev_get_drvdata(dev);
> + int err;
> +
> + switch (type) {
> + case hwmon_temp:
> + switch (attr) {
> + case hwmon_temp_input:
> + err = tps23861_read_temp(data, val);
> + break;
> + default:
> + return -EINVAL;
return -EOPNOTSUPP;
same below.
> + }
> + break;
> + case hwmon_in:
> + switch (attr) {
> + case hwmon_in_input:
> + err = tps23861_read_voltage(data, channel, val);
> + break;
> + default:
> + return -EINVAL;
> + }
> + break;
> + case hwmon_curr:
> + switch (attr) {
> + case hwmon_curr_input:
> + err = tps23861_read_current(data, channel, val);
> + break;
> + default:
> + return -EINVAL;
> + }
> + break;
> + case hwmon_power:
> + switch (attr) {
> + case hwmon_power_input:
> + err = tps23861_calculate_power(data, channel, val);
> + break;
> + default:
> + return -EINVAL;
> + }
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return err;
> +}
> +
> +static const char * const tps23861_port_label[] = {
> + "Port1",
> + "Port2",
> + "Port3",
> + "Port4",
> + "Input",
> +};
> +
> +static int tps23861_read_string(struct device *dev,
> + enum hwmon_sensor_types type,
> + u32 attr, int channel, const char **str)
> +{
> + switch (type) {
> + case hwmon_in:
> + case hwmon_curr:
> + case hwmon_power:
> + *str = tps23861_port_label[channel];
> + break;
> + default:
> + return -EOPNOTSUPP;
> + }
> + return 0;
> +}
> +
> +static const struct hwmon_channel_info *tps23861_info[] = {
> + HWMON_CHANNEL_INFO(chip,
> + HWMON_C_REGISTER_TZ),
> + HWMON_CHANNEL_INFO(temp,
> + HWMON_T_INPUT),
> + HWMON_CHANNEL_INFO(in,
> + HWMON_I_INPUT | HWMON_I_LABEL,
> + HWMON_I_INPUT | HWMON_I_LABEL,
> + HWMON_I_INPUT | HWMON_I_LABEL,
> + HWMON_I_INPUT | HWMON_I_LABEL,
> + HWMON_I_INPUT | HWMON_I_LABEL),
> + HWMON_CHANNEL_INFO(curr,
> + HWMON_C_INPUT | HWMON_C_LABEL,
> + HWMON_C_INPUT | HWMON_C_LABEL,
> + HWMON_C_INPUT | HWMON_C_LABEL,
> + HWMON_C_INPUT | HWMON_C_LABEL),
> + HWMON_CHANNEL_INFO(power,
> + HWMON_P_INPUT | HWMON_P_LABEL,
> + HWMON_P_INPUT | HWMON_P_LABEL,
> + HWMON_P_INPUT | HWMON_P_LABEL,
> + HWMON_P_INPUT | HWMON_P_LABEL),
> + NULL
> +};
> +
> +static const struct hwmon_ops tps23861_hwmon_ops = {
> + .is_visible = tps23861_is_visible,
> + .read = tps23861_read,
> + .read_string = tps23861_read_string,
> +};
> +
> +static const struct hwmon_chip_info tps23861_chip_info = {
> + .ops = &tps23861_hwmon_ops,
> + .info = tps23861_info,
> +};
> +
> +static ssize_t tps23861_port_status_show(struct device *dev,
> + struct device_attribute *da,
> + char *buf)
> +{
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> + struct tps23861_data *data = dev_get_drvdata(dev);
> + char *detect_status, *class_status;
> + unsigned int regval;
> + u8 class, detect;
> +
> + regmap_read(data->regmap, attr->index, ®val);
> + detect = FIELD_GET(PORT_STATUS_DETECT_MASK, regval);
> + class = FIELD_GET(PORT_STATUS_CLASS_MASK, regval);
> +
> + switch (detect) {
> + case PORT_DETECT_UNKNOWN:
> + detect_status = "Unknown device";
> + break;
> + case PORT_DETECT_SHORT:
> + detect_status = "Short circuit detected";
> + break;
> + case PORT_DETECT_RESISTANCE_LOW:
> + detect_status = "Too low resistance detected";
> + break;
> + case PORT_DETECT_RESISTANCE_OK:
> + detect_status = "Valid resistance detected";
> + break;
> + case PORT_DETECT_RESISTANCE_HIGH:
> + detect_status = "Too high resistance detected";
> + break;
> + case PORT_DETECT_OPEN_CIRCUIT:
> + detect_status = "Open circuit detected";
> + break;
> + case PORT_DETECT_MOSFET_FAULT:
> + detect_status = "MOSFET fault detected";
> + break;
> + case PORT_DETECT_LEGACY:
> + detect_status = "Legacy device detected";
> + break;
> + case PORT_DETECT_CAPACITANCE_INVALID_BEYOND:
> + detect_status = "Invalid capacitance, beyond clamp voltage";
> + break;
> + case PORT_DETECT_CAPACITANCE_INVALID_DELTA:
> + detect_status = "Invalid capacitance, insufficient voltage delta";
> + break;
> + case PORT_DETECT_CAPACITANCE_OUT_OF_RANGE:
> + detect_status = "Valid capacitance, outside of legacy range";
> + break;
> + case PORT_DETECT_RESERVED:
> + case PORT_DETECT_RESERVED_2:
> + default:
> + return -EINVAL;
> + }
> +
> + switch (class) {
> + case PORT_CLASS_UNKNOWN:
> + class_status = "Unknown class";
> + break;
> + case PORT_CLASS_RESERVED:
> + case PORT_CLASS_0:
> + class_status = "Class 0";
> + break;
> + case PORT_CLASS_1:
> + class_status = "Class 1";
> + break;
> + case PORT_CLASS_2:
> + class_status = "Class 2";
> + break;
> + case PORT_CLASS_3:
> + class_status = "Class 3";
> + break;
> + case PORT_CLASS_4:
> + class_status = "Class 4";
> + break;
> + case PORT_CLASS_OVERCURRENT:
> + class_status = "Overcurrent";
> + break;
> + case PORT_CLASS_MISMATCH:
> + class_status = "Class mismatch";
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return snprintf(buf, PAGE_SIZE, "%s, %s\n", detect_status, class_status);
> +}
> +
> +static ssize_t tps23861_poe_plus_show(struct device *dev,
> + struct device_attribute *da,
> + char *buf)
> +{
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> + struct tps23861_data *data = dev_get_drvdata(dev);
> + char *ports[4];
> + unsigned int regval;
> + int i;
> +
> + regmap_read(data->regmap, attr->index, ®val);
> +
> + for (i = 0; i < 4; i++) {
> + if (BIT(i + 4) & regval)
> + ports[i] = "Yes";
> + else
> + ports[i] = "No";
> + }
> +
> + return snprintf(buf, PAGE_SIZE, "Port 1: %s\nPort 2: %s\nPort 3: %s\nPort 4: %s\n",
> + ports[0], ports[1], ports[2], ports[3]);
> +}
> +
> +static ssize_t tps23861_port_disable_store(struct device *dev,
> + struct device_attribute *da,
> + const char *buf, size_t count)
> +{
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> + struct tps23861_data *data = dev_get_drvdata(dev);
> + unsigned int regval, port;
> + int ret;
> +
> + ret = kstrtouint(buf, 0, &port);
> + if (ret < 0)
> + return ret;
> +
> + regmap_read(data->regmap, attr->index, ®val);
> + regval |= BIT(port + 3);
> + regmap_write(data->regmap, attr->index, regval);
> +
> + return count;
> +}
> +
> +static ssize_t tps23861_port_enable_store(struct device *dev,
> + struct device_attribute *da,
> + const char *buf, size_t count)
> +{
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> + struct tps23861_data *data = dev_get_drvdata(dev);
> + unsigned int regval, port;
> + int ret;
> +
> + ret = kstrtouint(buf, 0, &port);
> + if (ret < 0)
> + return ret;
> +
> + regmap_read(data->regmap, attr->index, ®val);
> + regval |= BIT(port - 1);
> + regval |= BIT(port + 3);
> + regmap_write(data->regmap, attr->index, regval);
> +
> + return count;
> +}
> +
> +static SENSOR_DEVICE_ATTR_RO(port1_status, tps23861_port_status, PORT_1_STATUS);
> +static SENSOR_DEVICE_ATTR_RO(port2_status, tps23861_port_status, PORT_2_STATUS);
> +static SENSOR_DEVICE_ATTR_RO(port3_status, tps23861_port_status, PORT_3_STATUS);
> +static SENSOR_DEVICE_ATTR_RO(port4_status, tps23861_port_status, PORT_4_STATUS);
> +static SENSOR_DEVICE_ATTR_RO(poe_plus_status, tps23861_poe_plus, POE_PLUS);
sysfs files are supposed to return simple values. If the above is desired/needed,
I would suggest to implement debugfs attributes.
> +static SENSOR_DEVICE_ATTR_WO(port_disable, tps23861_port_disable, POWER_ENABLE);
> +static SENSOR_DEVICE_ATTR_WO(port_enable, tps23861_port_enable, DETECT_CLASS_RESTART);
> +
We already have standard enable attributes. Please use those.
Also, a separate 'disable' attribute is unnecessary.
> +static struct attribute *tps23861_attrs[] = {
> + &sensor_dev_attr_port1_status.dev_attr.attr,
> + &sensor_dev_attr_port2_status.dev_attr.attr,
> + &sensor_dev_attr_port3_status.dev_attr.attr,
> + &sensor_dev_attr_port4_status.dev_attr.attr,
> + &sensor_dev_attr_poe_plus_status.dev_attr.attr,
> + &sensor_dev_attr_port_disable.dev_attr.attr,
> + &sensor_dev_attr_port_enable.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group tps23861_group = {
> + .attrs = tps23861_attrs,
> +};
> +__ATTRIBUTE_GROUPS(tps23861);
> +
> +static int tps23861_probe(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + struct tps23861_data *data;
> + struct device *hwmon_dev;
> + u32 shunt_resistor;
> +
> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + data->regmap = devm_regmap_init_i2c(client, &tps23861_regmap_config);
> + if (IS_ERR(data->regmap)) {
> + dev_err(dev, "failed to allocate register map\n");
> + return PTR_ERR(data->regmap);
> + }
> +
> + if (of_property_read_u32(dev->of_node, "shunt-resistor-micro-ohms", &shunt_resistor) < 0)
> + data->shunt_resistor = shunt_resistor;
> + else
> + data->shunt_resistor = SHUNT_RESISTOR_DEFAULT;
> +
> + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
> + data, &tps23861_chip_info,
> + tps23861_groups);
> + return PTR_ERR_OR_ZERO(hwmon_dev);
> +}
> +
> +static const struct of_device_id __maybe_unused tps23861_of_match[] = {
> + { .compatible = "ti,tps23861", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, tps23861_of_match);
> +
> +static struct i2c_driver tps23861_driver = {
> + .probe_new = tps23861_probe,
> + .driver = {
> + .name = "tps23861",
> + .of_match_table = of_match_ptr(tps23861_of_match),
> + },
> +};
> +module_i2c_driver(tps23861_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
> +MODULE_DESCRIPTION("TI TPS23861 PoE PSE");
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 2/3] hwmon: add Texas Instruments TPS23861 driver
2020-12-21 16:26 ` Guenter Roeck
@ 2020-12-22 14:31 ` Robert Marko
0 siblings, 0 replies; 5+ messages in thread
From: Robert Marko @ 2020-12-22 14:31 UTC (permalink / raw)
To: Guenter Roeck
Cc: jdelvare, robh+dt, linux-hwmon, devicetree, linux-kernel, Luka Perkov
On Mon, Dec 21, 2020 at 5:26 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 12/19/20 11:11 AM, Robert Marko wrote:
> > Add basic monitoring support as well as port on/off control for Texas
> > Instruments TPS23861 PoE PSE IC.
> >
> > Signed-off-by: Robert Marko <robert.marko@sartura.hr>
> > Cc: Luka Perkov <luka.perkov@sartura.hr>
> > ---
> > Changes in v2:
> > * Convert to devm_hwmon_device_register_with_info()
> > * Change license
> >
> > drivers/hwmon/Kconfig | 11 +
> > drivers/hwmon/Makefile | 1 +
> > drivers/hwmon/tps23861.c | 538 +++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 550 insertions(+)
> > create mode 100644 drivers/hwmon/tps23861.c
> >
> > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> > index a850e4f0e0bd..3368ecfa7a9c 100644
> > --- a/drivers/hwmon/Kconfig
> > +++ b/drivers/hwmon/Kconfig
> > @@ -1102,6 +1102,17 @@ config SENSORS_TC654
> > This driver can also be built as a module. If so, the module
> > will be called tc654.
> >
> > +config SENSORS_TPS23861
> > + tristate "Texas Instruments TPS23861 PoE PSE"
> > + depends on I2C
> > + select REGMAP_I2C
> > + help
> > + If you say yes here you get support for Texas Instruments
> > + TPS23861 802.3at PoE PSE chips.
> > +
> > + This driver can also be built as a module. If so, the module
> > + will be called tps23861.
> > +
> > config SENSORS_MENF21BMC_HWMON
> > tristate "MEN 14F021P00 BMC Hardware Monitoring"
> > depends on MFD_MENF21BMC
> > diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> > index 9db2903b61e5..7493e9d5dc43 100644
> > --- a/drivers/hwmon/Makefile
> > +++ b/drivers/hwmon/Makefile
> > @@ -141,6 +141,7 @@ obj-$(CONFIG_SENSORS_MAX31790) += max31790.o
> > obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
> > obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
> > obj-$(CONFIG_SENSORS_TC654) += tc654.o
> > +obj-$(CONFIG_SENSORS_TPS23861) += tps23861.o
> > obj-$(CONFIG_SENSORS_MLXREG_FAN) += mlxreg-fan.o
> > obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
> > obj-$(CONFIG_SENSORS_MR75203) += mr75203.o
> > diff --git a/drivers/hwmon/tps23861.c b/drivers/hwmon/tps23861.c
> > new file mode 100644
> > index 000000000000..2bb804ccdc8e
> > --- /dev/null
> > +++ b/drivers/hwmon/tps23861.c
> > @@ -0,0 +1,538 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Copyright (c) 2020 Sartura Ltd.
> > + *
> > + * Driver for the TI TPS23861 PoE PSE.
> > + *
> > + * Author: Robert Marko <robert.marko@sartura.hr>
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/delay.h>
> > +#include <linux/hwmon-sysfs.h>
> > +#include <linux/hwmon.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/regmap.h>
> > +
> > +#define TEMPERATURE 0x2c
> > +#define INPUT_VOLTAGE_LSB 0x2e
> > +#define INPUT_VOLTAGE_MSB 0x2f
> > +#define PORT_1_CURRENT_LSB 0x30
> > +#define PORT_1_CURRENT_MSB 0x31
> > +#define PORT_1_VOLTAGE_LSB 0x32
> > +#define PORT_1_VOLTAGE_MSB 0x33
> > +#define PORT_2_CURRENT_LSB 0x34
> > +#define PORT_2_CURRENT_MSB 0x35
> > +#define PORT_2_VOLTAGE_LSB 0x36
> > +#define PORT_2_VOLTAGE_MSB 0x37
> > +#define PORT_3_CURRENT_LSB 0x38
> > +#define PORT_3_CURRENT_MSB 0x39
> > +#define PORT_3_VOLTAGE_LSB 0x3a
> > +#define PORT_3_VOLTAGE_MSB 0x3b
> > +#define PORT_4_CURRENT_LSB 0x3c
> > +#define PORT_4_CURRENT_MSB 0x3d
> > +#define PORT_4_VOLTAGE_LSB 0x3e
> > +#define PORT_4_VOLTAGE_MSB 0x3f
> > +#define PORT_N_CURRENT_LSB_OFFSET 0x04
> > +#define PORT_N_VOLTAGE_LSB_OFFSET 0x04
> > +#define VOLTAGE_CURRENT_MASK GENMASK(13, 0)
> > +#define PORT_1_STATUS 0x0c
> > +#define PORT_2_STATUS 0x0d
> > +#define PORT_3_STATUS 0x0e
> > +#define PORT_4_STATUS 0x0f
> > +#define PORT_STATUS_CLASS_MASK GENMASK(7, 4)
> > +#define PORT_STATUS_DETECT_MASK GENMASK(3, 0)
> > +#define PORT_CLASS_UNKNOWN 0
> > +#define PORT_CLASS_1 1
> > +#define PORT_CLASS_2 2
> > +#define PORT_CLASS_3 3
> > +#define PORT_CLASS_4 4
> > +#define PORT_CLASS_RESERVED 5
> > +#define PORT_CLASS_0 6
> > +#define PORT_CLASS_OVERCURRENT 7
> > +#define PORT_CLASS_MISMATCH 8
> > +#define PORT_DETECT_UNKNOWN 0
> > +#define PORT_DETECT_SHORT 1
> > +#define PORT_DETECT_RESERVED 2
> > +#define PORT_DETECT_RESISTANCE_LOW 3
> > +#define PORT_DETECT_RESISTANCE_OK 4
> > +#define PORT_DETECT_RESISTANCE_HIGH 5
> > +#define PORT_DETECT_OPEN_CIRCUIT 6
> > +#define PORT_DETECT_RESERVED_2 7
> > +#define PORT_DETECT_MOSFET_FAULT 8
> > +#define PORT_DETECT_LEGACY 9
> > +/* Measurment beyond clamp voltage */
> > +#define PORT_DETECT_CAPACITANCE_INVALID_BEYOND 10
> > +/* Insufficient voltage delta */
> > +#define PORT_DETECT_CAPACITANCE_INVALID_DELTA 11
> > +#define PORT_DETECT_CAPACITANCE_OUT_OF_RANGE 12
> > +#define POE_PLUS 0x40
> > +
> > +#define DETECT_CLASS_RESTART 0x18
> > +#define POWER_ENABLE 0x19
> > +
> > +#define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */
> > +#define VOLTAGE_LSB 3662 /* 3.662 mV */
> > +#define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */
> > +#define CURRENT_LSB_255 62260 /* 62.260 uA */
> > +#define CURRENT_LSB_250 61039 /* 61.039 uA */
> > +
> > +struct tps23861_data {
> > + struct regmap *regmap;
> > + u32 shunt_resistor;
> > +};
> > +
> > +static struct regmap_config tps23861_regmap_config = {
> > + .reg_bits = 8,
> > + .val_bits = 8,
> > +};
> > +
> > +static int tps23861_read_temp(struct tps23861_data *data, long *val)
> > +{
> > + unsigned int regval;
> > + int err;
> > +
> > + err = regmap_read(data->regmap, TEMPERATURE, ®val);
> > + if (err < 0)
> > + return err;
> > +
> > + *val = (regval * TEMPERATURE_LSB) - 20000;
> > +
> > + return 0;
> > +}
> > +
> > +static int tps23861_read_voltage(struct tps23861_data *data, int channel,
> > + long *val)
> > +{
> > + unsigned int regval;
> > + int err;
> > +
> > + if (channel < 4) {
> > + err = regmap_bulk_read(data->regmap,
> > + PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET,
> > + ®val, 2);
> > + } else {
> > + err = regmap_bulk_read(data->regmap,
> > + INPUT_VOLTAGE_LSB,
> > + ®val, 2);
> > + }
> > + if (err < 0)
> > + return err;
> > +
> > + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000;
> > +
> > + return 0;
> > +}
> > +
> > +static int tps23861_read_current(struct tps23861_data *data, int channel,
> > + long *val)
> > +{
> > + unsigned int current_lsb;
> > + unsigned int regval;
> > + int err;
> > +
> > + if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
> > + current_lsb = CURRENT_LSB_255;
> > + else
> > + current_lsb = CURRENT_LSB_250;
> > +
> > + err = regmap_bulk_read(data->regmap,
> > + PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET,
> > + ®val, 2);
> > + if (err < 0)
> > + return err;
> > +
> > + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000;
> > +
> > + return 0;
> > +}
> > +
> > +static int tps23861_calculate_power(struct tps23861_data *data, int channel,
> > + long *val)
> > +{
> > + long voltage, current_ma;
> > + int err;
> > +
> > + err = tps23861_read_voltage(data, channel, &voltage);
> > + if (err < 0)
> > + return err;
> > +
> > + err = tps23861_read_current(data, channel, ¤t_ma);
> > + if (err < 0)
> > + return err;
> > +
>
> It is not the responsibility of the kernel to calculate power values.
> This can and should be done in userspace. Kenrel power attributes are
> only appropriate if reported by the hardware.
Ok, dropped it.
>
> > + *val = voltage * current_ma;
> > +
> > + return 0;
> > +}
> > +
> > +static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type,
> > + u32 attr, int channel)
> > +{
> > + switch (type) {
> > + case hwmon_temp:
> > + switch (attr) {
> > + case hwmon_temp_input:
> > + return 0444;
>
> default: missing. Same below.
Added in v3.
>
> > + }
> > + break;
> > + case hwmon_in:
> > + switch (attr) {
> > + case hwmon_in_input:
> > + case hwmon_in_label:
> > + return 0444;
> > + }
> > + break;
> > + case hwmon_curr:
> > + switch (attr) {
> > + case hwmon_curr_input:
> > + case hwmon_curr_label:
> > + return 0444;
> > + }
> > + break;
> > + case hwmon_power:
> > + switch (attr) {
> > + case hwmon_power_input:
> > + case hwmon_power_label:
> > + return 0444;
> > + }
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int tps23861_read(struct device *dev, enum hwmon_sensor_types type,
> > + u32 attr, int channel, long *val)
> > +{
> > + struct tps23861_data *data = dev_get_drvdata(dev);
> > + int err;
> > +
> > + switch (type) {
> > + case hwmon_temp:
> > + switch (attr) {
> > + case hwmon_temp_input:
> > + err = tps23861_read_temp(data, val);
> > + break;
> > + default:
> > + return -EINVAL;
>
> return -EOPNOTSUPP;
>
> same below.
Changed in v3.
>
> > + }
> > + break;
> > + case hwmon_in:
> > + switch (attr) {
> > + case hwmon_in_input:
> > + err = tps23861_read_voltage(data, channel, val);
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > + break;
> > + case hwmon_curr:
> > + switch (attr) {
> > + case hwmon_curr_input:
> > + err = tps23861_read_current(data, channel, val);
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > + break;
> > + case hwmon_power:
> > + switch (attr) {
> > + case hwmon_power_input:
> > + err = tps23861_calculate_power(data, channel, val);
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + return err;
> > +}
> > +
> > +static const char * const tps23861_port_label[] = {
> > + "Port1",
> > + "Port2",
> > + "Port3",
> > + "Port4",
> > + "Input",
> > +};
> > +
> > +static int tps23861_read_string(struct device *dev,
> > + enum hwmon_sensor_types type,
> > + u32 attr, int channel, const char **str)
> > +{
> > + switch (type) {
> > + case hwmon_in:
> > + case hwmon_curr:
> > + case hwmon_power:
> > + *str = tps23861_port_label[channel];
> > + break;
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > + return 0;
> > +}
> > +
> > +static const struct hwmon_channel_info *tps23861_info[] = {
> > + HWMON_CHANNEL_INFO(chip,
> > + HWMON_C_REGISTER_TZ),
> > + HWMON_CHANNEL_INFO(temp,
> > + HWMON_T_INPUT),
> > + HWMON_CHANNEL_INFO(in,
> > + HWMON_I_INPUT | HWMON_I_LABEL,
> > + HWMON_I_INPUT | HWMON_I_LABEL,
> > + HWMON_I_INPUT | HWMON_I_LABEL,
> > + HWMON_I_INPUT | HWMON_I_LABEL,
> > + HWMON_I_INPUT | HWMON_I_LABEL),
> > + HWMON_CHANNEL_INFO(curr,
> > + HWMON_C_INPUT | HWMON_C_LABEL,
> > + HWMON_C_INPUT | HWMON_C_LABEL,
> > + HWMON_C_INPUT | HWMON_C_LABEL,
> > + HWMON_C_INPUT | HWMON_C_LABEL),
> > + HWMON_CHANNEL_INFO(power,
> > + HWMON_P_INPUT | HWMON_P_LABEL,
> > + HWMON_P_INPUT | HWMON_P_LABEL,
> > + HWMON_P_INPUT | HWMON_P_LABEL,
> > + HWMON_P_INPUT | HWMON_P_LABEL),
> > + NULL
> > +};
> > +
> > +static const struct hwmon_ops tps23861_hwmon_ops = {
> > + .is_visible = tps23861_is_visible,
> > + .read = tps23861_read,
> > + .read_string = tps23861_read_string,
> > +};
> > +
> > +static const struct hwmon_chip_info tps23861_chip_info = {
> > + .ops = &tps23861_hwmon_ops,
> > + .info = tps23861_info,
> > +};
> > +
> > +static ssize_t tps23861_port_status_show(struct device *dev,
> > + struct device_attribute *da,
> > + char *buf)
> > +{
> > + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> > + struct tps23861_data *data = dev_get_drvdata(dev);
> > + char *detect_status, *class_status;
> > + unsigned int regval;
> > + u8 class, detect;
> > +
> > + regmap_read(data->regmap, attr->index, ®val);
> > + detect = FIELD_GET(PORT_STATUS_DETECT_MASK, regval);
> > + class = FIELD_GET(PORT_STATUS_CLASS_MASK, regval);
> > +
> > + switch (detect) {
> > + case PORT_DETECT_UNKNOWN:
> > + detect_status = "Unknown device";
> > + break;
> > + case PORT_DETECT_SHORT:
> > + detect_status = "Short circuit detected";
> > + break;
> > + case PORT_DETECT_RESISTANCE_LOW:
> > + detect_status = "Too low resistance detected";
> > + break;
> > + case PORT_DETECT_RESISTANCE_OK:
> > + detect_status = "Valid resistance detected";
> > + break;
> > + case PORT_DETECT_RESISTANCE_HIGH:
> > + detect_status = "Too high resistance detected";
> > + break;
> > + case PORT_DETECT_OPEN_CIRCUIT:
> > + detect_status = "Open circuit detected";
> > + break;
> > + case PORT_DETECT_MOSFET_FAULT:
> > + detect_status = "MOSFET fault detected";
> > + break;
> > + case PORT_DETECT_LEGACY:
> > + detect_status = "Legacy device detected";
> > + break;
> > + case PORT_DETECT_CAPACITANCE_INVALID_BEYOND:
> > + detect_status = "Invalid capacitance, beyond clamp voltage";
> > + break;
> > + case PORT_DETECT_CAPACITANCE_INVALID_DELTA:
> > + detect_status = "Invalid capacitance, insufficient voltage delta";
> > + break;
> > + case PORT_DETECT_CAPACITANCE_OUT_OF_RANGE:
> > + detect_status = "Valid capacitance, outside of legacy range";
> > + break;
> > + case PORT_DETECT_RESERVED:
> > + case PORT_DETECT_RESERVED_2:
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + switch (class) {
> > + case PORT_CLASS_UNKNOWN:
> > + class_status = "Unknown class";
> > + break;
> > + case PORT_CLASS_RESERVED:
> > + case PORT_CLASS_0:
> > + class_status = "Class 0";
> > + break;
> > + case PORT_CLASS_1:
> > + class_status = "Class 1";
> > + break;
> > + case PORT_CLASS_2:
> > + class_status = "Class 2";
> > + break;
> > + case PORT_CLASS_3:
> > + class_status = "Class 3";
> > + break;
> > + case PORT_CLASS_4:
> > + class_status = "Class 4";
> > + break;
> > + case PORT_CLASS_OVERCURRENT:
> > + class_status = "Overcurrent";
> > + break;
> > + case PORT_CLASS_MISMATCH:
> > + class_status = "Class mismatch";
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + return snprintf(buf, PAGE_SIZE, "%s, %s\n", detect_status, class_status);
> > +}
> > +
> > +static ssize_t tps23861_poe_plus_show(struct device *dev,
> > + struct device_attribute *da,
> > + char *buf)
> > +{
> > + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> > + struct tps23861_data *data = dev_get_drvdata(dev);
> > + char *ports[4];
> > + unsigned int regval;
> > + int i;
> > +
> > + regmap_read(data->regmap, attr->index, ®val);
> > +
> > + for (i = 0; i < 4; i++) {
> > + if (BIT(i + 4) & regval)
> > + ports[i] = "Yes";
> > + else
> > + ports[i] = "No";
> > + }
> > +
> > + return snprintf(buf, PAGE_SIZE, "Port 1: %s\nPort 2: %s\nPort 3: %s\nPort 4: %s\n",
> > + ports[0], ports[1], ports[2], ports[3]);
> > +}
> > +
> > +static ssize_t tps23861_port_disable_store(struct device *dev,
> > + struct device_attribute *da,
> > + const char *buf, size_t count)
> > +{
> > + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> > + struct tps23861_data *data = dev_get_drvdata(dev);
> > + unsigned int regval, port;
> > + int ret;
> > +
> > + ret = kstrtouint(buf, 0, &port);
> > + if (ret < 0)
> > + return ret;
> > +
> > + regmap_read(data->regmap, attr->index, ®val);
> > + regval |= BIT(port + 3);
> > + regmap_write(data->regmap, attr->index, regval);
> > +
> > + return count;
> > +}
> > +
> > +static ssize_t tps23861_port_enable_store(struct device *dev,
> > + struct device_attribute *da,
> > + const char *buf, size_t count)
> > +{
> > + struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> > + struct tps23861_data *data = dev_get_drvdata(dev);
> > + unsigned int regval, port;
> > + int ret;
> > +
> > + ret = kstrtouint(buf, 0, &port);
> > + if (ret < 0)
> > + return ret;
> > +
> > + regmap_read(data->regmap, attr->index, ®val);
> > + regval |= BIT(port - 1);
> > + regval |= BIT(port + 3);
> > + regmap_write(data->regmap, attr->index, regval);
> > +
> > + return count;
> > +}
> > +
> > +static SENSOR_DEVICE_ATTR_RO(port1_status, tps23861_port_status, PORT_1_STATUS);
> > +static SENSOR_DEVICE_ATTR_RO(port2_status, tps23861_port_status, PORT_2_STATUS);
> > +static SENSOR_DEVICE_ATTR_RO(port3_status, tps23861_port_status, PORT_3_STATUS);
> > +static SENSOR_DEVICE_ATTR_RO(port4_status, tps23861_port_status, PORT_4_STATUS);
> > +static SENSOR_DEVICE_ATTR_RO(poe_plus_status, tps23861_poe_plus, POE_PLUS);
>
> sysfs files are supposed to return simple values. If the above is desired/needed,
> I would suggest to implement debugfs attributes.
Ok, moved these to debugfs.
>
> > +static SENSOR_DEVICE_ATTR_WO(port_disable, tps23861_port_disable, POWER_ENABLE);
> > +static SENSOR_DEVICE_ATTR_WO(port_enable, tps23861_port_enable, DETECT_CLASS_RESTART);
> > +
>
> We already have standard enable attributes. Please use those.
> Also, a separate 'disable' attribute is unnecessary.
Ok, implemented enable/disable using hwmon_in_enable in v3.
Regards,
Robert
>
> > +static struct attribute *tps23861_attrs[] = {
> > + &sensor_dev_attr_port1_status.dev_attr.attr,
> > + &sensor_dev_attr_port2_status.dev_attr.attr,
> > + &sensor_dev_attr_port3_status.dev_attr.attr,
> > + &sensor_dev_attr_port4_status.dev_attr.attr,
> > + &sensor_dev_attr_poe_plus_status.dev_attr.attr,
> > + &sensor_dev_attr_port_disable.dev_attr.attr,
> > + &sensor_dev_attr_port_enable.dev_attr.attr,
> > + NULL,
> > +};
> > +
> > +static const struct attribute_group tps23861_group = {
> > + .attrs = tps23861_attrs,
> > +};
> > +__ATTRIBUTE_GROUPS(tps23861);
> > +
> > +static int tps23861_probe(struct i2c_client *client)
> > +{
> > + struct device *dev = &client->dev;
> > + struct tps23861_data *data;
> > + struct device *hwmon_dev;
> > + u32 shunt_resistor;
> > +
> > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> > + if (!data)
> > + return -ENOMEM;
> > +
> > + data->regmap = devm_regmap_init_i2c(client, &tps23861_regmap_config);
> > + if (IS_ERR(data->regmap)) {
> > + dev_err(dev, "failed to allocate register map\n");
> > + return PTR_ERR(data->regmap);
> > + }
> > +
> > + if (of_property_read_u32(dev->of_node, "shunt-resistor-micro-ohms", &shunt_resistor) < 0)
> > + data->shunt_resistor = shunt_resistor;
> > + else
> > + data->shunt_resistor = SHUNT_RESISTOR_DEFAULT;
> > +
> > + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
> > + data, &tps23861_chip_info,
> > + tps23861_groups);
> > + return PTR_ERR_OR_ZERO(hwmon_dev);
> > +}
> > +
> > +static const struct of_device_id __maybe_unused tps23861_of_match[] = {
> > + { .compatible = "ti,tps23861", },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(of, tps23861_of_match);
> > +
> > +static struct i2c_driver tps23861_driver = {
> > + .probe_new = tps23861_probe,
> > + .driver = {
> > + .name = "tps23861",
> > + .of_match_table = of_match_ptr(tps23861_of_match),
> > + },
> > +};
> > +module_i2c_driver(tps23861_driver);
> > +
> > +MODULE_LICENSE("GPL");
> > +MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
> > +MODULE_DESCRIPTION("TI TPS23861 PoE PSE");
> >
>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-12-22 14:32 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-19 19:11 [PATCH v2 1/3] dt-bindings: hwmon: Add TI TPS23861 bindings Robert Marko
2020-12-19 19:11 ` [PATCH v2 2/3] hwmon: add Texas Instruments TPS23861 driver Robert Marko
2020-12-21 16:26 ` Guenter Roeck
2020-12-22 14:31 ` Robert Marko
2020-12-19 19:11 ` [PATCH v2 3/3] MAINTAINERS: Add entry for Texas Instruments TPS23861 PoE PSE Robert Marko
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