This patch adds a HWMON driver for the EMC1812, EMC1813, EMC1814,
EMC1815 and EMC1833 temperature sensor chips from microchip. Does not
currently support the alert outputs.
Signed-off-by: Mark Tomlinson <mark.tomlinson@xxxxxxxxxxxxxxxxxxx>
Co-developed-by: Mathew McBride <matt@xxxxxxxxxxxxxxx>
Signed-off-by: Mathew McBride <matt@xxxxxxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 10 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/emc181x.c | 296 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 307 insertions(+)
create mode 100644 drivers/hwmon/emc181x.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 307477b8a371..196d91494536 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1820,6 +1820,16 @@ config SENSORS_EMC1403
Threshold values can be configured using sysfs.
Data from the different diodes are accessible via sysfs.
+config SENSORS_EMC181X
+ tristate "SMSC EMC181X thermal sensor"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ If you say yes here you get support for the SMSC EMC181X
+ temperature monitoring chip.
+
+ Data from the different diodes are accessible via sysfs.
+
config SENSORS_EMC2103
tristate "SMSC EMC2103"
depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 3f4b0fda0998..bcea887dfe17 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_SENSORS_DRIVETEMP) += drivetemp.o
obj-$(CONFIG_SENSORS_DS620) += ds620.o
obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
obj-$(CONFIG_SENSORS_EMC1403) += emc1403.o
+obj-$(CONFIG_SENSORS_EMC181X) += emc181x.o
obj-$(CONFIG_SENSORS_EMC2103) += emc2103.o
obj-$(CONFIG_SENSORS_EMC2305) += emc2305.o
obj-$(CONFIG_SENSORS_EMC6W201) += emc6w201.o
diff --git a/drivers/hwmon/emc181x.c b/drivers/hwmon/emc181x.c
new file mode 100644
index 000000000000..364d2bfb15ca
--- /dev/null
+++ b/drivers/hwmon/emc181x.c
@@ -0,0 +1,296 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the Microchip/SMSC EMC181x Temperature monitor
+ *
+ * Copyright (C) 2018-2019 Traverse Technologies
+ * Author: Mathew McBride <matt@xxxxxxxxxxxxxxx>
+ *
+ * Copyright (C) 2023 Allied Telesis Labs
+ * Author: Mark Tomlinson <mark.tomlinson@xxxxxxxxxxxxxxxxxxx>
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/of_device.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#define EMC1812_ID 0x81
+#define EMC1813_ID 0x87
+#define EMC1814_ID 0x84
+#define EMC1815_ID 0x85
+#define EMC1833_ID 0x83
+
+#define MICROCHIP_ID 0x54
+
+#define EMC181X_STATUS_REG 0x02
+#define EMC181X_CONFIG_REG 0x03
+#define EMC181X_DIODE_DATA_BASE 0x60
+#define EMC181X_PID_REG 0xfd
+#define EMC181X_SMSC_ID_REG 0xfe
+#define EMC181X_REVISION_REG 0xff
+
+/* Adjustable address type is 0x7c, 0x5c, 0x4c, 0x6c, 0x1c, 0x3c */
+/* Fixed address is either 0x4c or 0x45 */
+static const unsigned short emc181x_address_list[] = {
+ 0x7c, 0x5c, 0x4c, 0x6c, 0x1c, 0x3c, 0x45, I2C_CLIENT_END
+};
+
+enum chips {
+ emc1812, emc1813,
+ emc1814, emc1815,
+ emc1833,
+};
+
+struct emc181x_data {
+ struct i2c_client *i2c;
+ enum chips type;
+ bool is_extended_range;
+};
+
+static int emc181x_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct emc181x_data *data = dev_get_drvdata(dev);
+ struct i2c_client *i2c = data->i2c;
+
+ u8 channel_reg = 0;
+ s32 channel_deg = 0;
+ s32 channel_frac = 0;
+
+ if (type != hwmon_temp)
+ return -EOPNOTSUPP;
+ if (channel > 4)
+ return -EINVAL;
+
+ channel_reg = EMC181X_DIODE_DATA_BASE + (channel * 0x02);
+ channel_deg = i2c_smbus_read_byte_data(i2c, channel_reg);
+ if (channel_deg < 0)
+ return channel_deg;
+ if (data->is_extended_range)
+ channel_deg -= 64;
+
+ channel_frac = i2c_smbus_read_byte_data(i2c, channel_reg + 0x01);
+ if (channel_frac < 0)
+ return channel_frac;
+
+ *val = ((channel_deg << 3) | (channel_frac >> 5)) * 125;
+ return 0;
+}
+
+static umode_t emc181x_is_visible(const void *drvdata, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ if (type == hwmon_temp && attr == hwmon_temp_input)
+ return 0444;
+ else
+ return 0;
+}
+
+static const struct hwmon_channel_info *emc1812_info[] = {
+ HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
+ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT, HWMON_T_INPUT),
+ NULL
+};
+
+static const struct hwmon_channel_info *emc1813_info[] = {
+ HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
+ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT, HWMON_T_INPUT, HWMON_T_INPUT),
+ NULL
+};
+
+static const struct hwmon_channel_info *emc1814_info[] = {
+ HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
+ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT, HWMON_T_INPUT, HWMON_T_INPUT,
+ HWMON_T_INPUT),
+ NULL
+};
+
+static const struct hwmon_channel_info *emc1815_info[] = {
+ HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
+ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT, HWMON_T_INPUT, HWMON_T_INPUT,
+ HWMON_T_INPUT, HWMON_T_INPUT),
+ NULL
+};
+
+static const struct hwmon_ops emc181x_ops = {
+ .is_visible = emc181x_is_visible,
+ .read = emc181x_read,
+};
+
+static const struct hwmon_chip_info emc181x_chip_info[] = {
+ [emc1812] = {
+ .ops = &emc181x_ops,
+ .info = emc1812_info,
+ },
+ [emc1813] = {
+ .ops = &emc181x_ops,
+ .info = emc1813_info,
+ },
+ [emc1814] = {
+ .ops = &emc181x_ops,
+ .info = emc1814_info,
+ },
+ [emc1815] = {
+ .ops = &emc181x_ops,
+ .info = emc1815_info,
+ },
+ [emc1833] = {
+ .ops = &emc181x_ops,
+ .info = emc1813_info,
+ },
+};
+
+static const struct i2c_device_id emc181x_i2c_id[] = {
+ { "emc1812", emc1812 },
+ { "emc1813", emc1813 },
+ { "emc1814", emc1814 },
+ { "emc1815", emc1815 },
+ { "emc1833", emc1833 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, emc181x_i2c_id);
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int emc181x_i2c_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ int pid, id, rev;
+ const char *name;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA))
+ return -ENODEV;
+
+ /* Determine the chip type */
+ id = i2c_smbus_read_byte_data(client, EMC181X_SMSC_ID_REG);
+ if (id < 0)
+ return id;
+ if (id != MICROCHIP_ID)
+ return -ENODEV;
+ pid = i2c_smbus_read_byte_data(client, EMC181X_PID_REG);
+ if (pid < 0)
+ return pid;
+ rev = i2c_smbus_read_byte_data(client, EMC181X_REVISION_REG);
+ if (rev < 0)
+ return rev;
+
+ switch (pid) {
+ case EMC1812_ID:
+ name = emc181x_i2c_id[emc1812].name;
+ break;
+ case EMC1813_ID:
+ name = emc181x_i2c_id[emc1813].name;
+ break;
+ case EMC1814_ID:
+ name = emc181x_i2c_id[emc1814].name;
+ break;
+ case EMC1815_ID:
+ name = emc181x_i2c_id[emc1815].name;
+ break;
+ case EMC1833_ID:
+ name = emc181x_i2c_id[emc1833].name;
+ break;
+ default:
+ return -ENODEV;
+ }
+ strscpy(info->type, name, I2C_NAME_SIZE);
+
+ dev_dbg(&client->dev,
+ "Detected device %s at 0x%02x with COMPANY: 0x%02x and PID: 0x%02x REV: 0x%02x\n",
+ name, client->addr, id, pid, rev);
+
+ return 0;
+}
+
+static int emc181x_i2c_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct device *hwmon_dev;
+ struct emc181x_data *data;
+ s32 regval;
+ u8 config;
+
+ data = devm_kzalloc(dev, sizeof(struct emc181x_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->i2c = client;
+ if (dev_fwnode(dev)) {
+ data->type = (enum chips)device_get_match_data(dev);
+ data->is_extended_range = device_property_present(dev, "emc181x,extended-range");
+ } else
+ data->type = i2c_match_id(emc181x_i2c_id, client)->driver_data;
+
+ regval = i2c_smbus_read_byte_data(client, EMC181X_CONFIG_REG);
+ if (regval < 0) {
+ dev_dbg(dev, "Failed to read config reg %d", regval);
+ return regval;
+ }
+
+ /* By default, extended range is disabled in the EMC181X,
+ * if enabled we need to set this in the CONFIG register.
+ */
+ config = regval & ~0x04;
+ if (data->is_extended_range)
+ config |= 0x04;
+
+ dev_dbg(dev, "EMC181X setting CONFIG to %d\n", config);
+ if (config != regval)
+ i2c_smbus_write_byte_data(client, EMC181X_CONFIG_REG, config);
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev,
+ client->name,
+ data,
+ &emc181x_chip_info[data->type],
+ NULL);
+
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct of_device_id __maybe_unused emc181x_of_match[] = {
+ {
+ .compatible = "microchip,emc1812",
+ .data = (void *)emc1812
+ },
+ {
+ .compatible = "microchip,emc1813",
+ .data = (void *)emc1813
+ },
+ {
+ .compatible = "microchip,emc1814",
+ .data = (void *)emc1814
+ },
+ {
+ .compatible = "microchip,emc1815",
+ .data = (void *)emc1815
+ },
+ {
+ .compatible = "microchip,emc1833",
+ .data = (void *)emc1833
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(of, emc181x_of_match);
+
+static struct i2c_driver emc181x_i2c_driver = {
+ .driver = {
+ .name = "emc181x",
+ .of_match_table = of_match_ptr(emc181x_of_match),
+ },
+ .probe = emc181x_i2c_probe,
+ .id_table = emc181x_i2c_id,
+ .detect = emc181x_i2c_detect,
+ .address_list = emc181x_address_list,
+};
+
+module_i2c_driver(emc181x_i2c_driver);
+
+MODULE_DESCRIPTION("EMC181X Sensor Driver");
+MODULE_AUTHOR("Mark Tomlinson <mark.tomlinson@xxxxxxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.41.0
