This patch adds initial monitoring support for the MC34VR500 PMIC. In its current form, input voltage and temperature alarms are reported to hwmon. Datasheet: - https://www.nxp.com/docs/en/data-sheet/MC34VR500.pdf Changes since v1: - included required #defines directly in the C file - removed separate header file - removed #defines for unimplemented sensors - removed error log output - use hwmon_device_register_with_info API - cleaned probe function - added documentation for chip and dt bindings Signed-off-by: Mario Kicherer <dev@xxxxxxxxxxxx> --- drivers/hwmon/Kconfig | 7 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/mc34vr500.c | 245 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 253 insertions(+) create mode 100644 drivers/hwmon/mc34vr500.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 3176c33af6c6..69d4c1609494 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1166,6 +1166,13 @@ config SENSORS_MAX31790 This driver can also be built as a module. If so, the module will be called max31790. +config SENSORS_MC34VR500 + tristate "NXP MC34VR500 hardware monitoring driver" + depends on I2C + help + If you say yes here you get support for the temperature and input + voltage sensors of the NXP MC34VR500. + config SENSORS_MCP3021 tristate "Microchip MCP3021 and compatibles" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index e2e4e87b282f..4bef13d16c66 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -149,6 +149,7 @@ obj-$(CONFIG_SENSORS_MAX6650) += max6650.o obj-$(CONFIG_SENSORS_MAX6697) += max6697.o obj-$(CONFIG_SENSORS_MAX31790) += max31790.o obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o +obj-$(CONFIG_SENSORS_MC34VR500) += mc34vr500.o obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o obj-$(CONFIG_SENSORS_TC654) += tc654.o obj-$(CONFIG_SENSORS_TPS23861) += tps23861.o diff --git a/drivers/hwmon/mc34vr500.c b/drivers/hwmon/mc34vr500.c new file mode 100644 index 000000000000..211dc44af42e --- /dev/null +++ b/drivers/hwmon/mc34vr500.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * An hwmon driver for the NXP MC34VR500 PMIC + * + * Author: Mario Kicherer <dev@xxxxxxxxxxxx> + */ + +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/i2c.h> +#include <linux/regmap.h> + +#define MC34VR500_I2C_ADDR 0x08 +#define MC34VR500_DEVICEID_VALUE 0x14 + +/* INTSENSE0 */ +#define ENS_BIT BIT(0) +#define LOWVINS_BIT BIT(1) +#define THERM110S_BIT BIT(2) +#define THERM120S_BIT BIT(3) +#define THERM125S_BIT BIT(4) +#define THERM130S_BIT BIT(5) + +#define MC34VR500_DEVICEID 0x00 + +#define MC34VR500_SILICONREVID 0x03 +#define MC34VR500_FABID 0x04 +#define MC34VR500_INTSTAT0 0x05 +#define MC34VR500_INTMASK0 0x06 +#define MC34VR500_INTSENSE0 0x07 + +struct mc34vr500_data { + struct device *hwmon_dev; + struct i2c_client *client; + struct regmap *regmap; +}; + +static irqreturn_t mc34vr500_process_interrupt(int irq, void *userdata) +{ + struct mc34vr500_data *data = (struct mc34vr500_data *)userdata; + unsigned int reg; + int ret; + + ret = regmap_read(data->regmap, MC34VR500_INTSTAT0, ®); + if (ret < 0) + return IRQ_HANDLED; + + if (reg) { + if (reg & LOWVINS_BIT) + hwmon_notify_event(data->hwmon_dev, hwmon_in, + hwmon_in_min_alarm, 0); + + if (reg & THERM110S_BIT) + hwmon_notify_event(data->hwmon_dev, hwmon_temp, + hwmon_temp_max_alarm, 0); + + if (reg & THERM120S_BIT) + hwmon_notify_event(data->hwmon_dev, hwmon_temp, + hwmon_temp_crit_alarm, 0); + + if (reg & THERM130S_BIT) + hwmon_notify_event(data->hwmon_dev, hwmon_temp, + hwmon_temp_emergency_alarm, 0); + } + + return IRQ_HANDLED; +} + +static umode_t mc34vr500_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (attr) { + case hwmon_in_min_alarm: + case hwmon_temp_max_alarm: + case hwmon_temp_crit_alarm: + case hwmon_temp_emergency_alarm: + return 0444; + default: + break; + } + + return 0; +} + +static int mc34vr500_alarm_read(struct mc34vr500_data *data, int index, + long *val) +{ + unsigned int reg; + int ret; + + ret = regmap_read(data->regmap, MC34VR500_INTSTAT0, ®); + if (ret < 0) + return ret; + + *val = !!(reg & index); + + /* write 1 to clear */ + reg = index; + regmap_write(data->regmap, MC34VR500_INTSTAT0, reg); + + return 0; +} + +static int mc34vr500_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct mc34vr500_data *data = dev_get_drvdata(dev); + + switch (type) { + case hwmon_in: + switch (attr) { + case hwmon_in_min_alarm: + return mc34vr500_alarm_read(data, LOWVINS_BIT, val); + default: + return -EOPNOTSUPP; + } + case hwmon_temp: + switch (attr) { + case hwmon_temp_max_alarm: + return mc34vr500_alarm_read(data, THERM110S_BIT, val); + case hwmon_temp_crit_alarm: + return mc34vr500_alarm_read(data, THERM120S_BIT, val); + case hwmon_temp_emergency_alarm: + return mc34vr500_alarm_read(data, THERM130S_BIT, val); + default: + return -EOPNOTSUPP; + } + default: + return -EOPNOTSUPP; + } +} + +static const struct hwmon_channel_info *mc34vr500_info[] = { + HWMON_CHANNEL_INFO(in, HWMON_I_MIN_ALARM), + HWMON_CHANNEL_INFO(temp, HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM + | HWMON_T_EMERGENCY_ALARM), + NULL, +}; + +static const struct hwmon_ops mc34vr500_hwmon_ops = { + .is_visible = mc34vr500_is_visible, + .read = mc34vr500_read, +}; + +static const struct hwmon_chip_info mc34vr500_chip_info = { + .ops = &mc34vr500_hwmon_ops, + .info = mc34vr500_info, +}; + +static const struct regmap_config mc34vr500_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MC34VR500_INTSENSE0, +}; + +static int mc34vr500_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct mc34vr500_data *data; + struct device *hwmon_dev; + int ret; + unsigned int reg, revid, fabid; + struct regmap *regmap; + + regmap = devm_regmap_init_i2c(client, &mc34vr500_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + data = devm_kzalloc(dev, sizeof(struct mc34vr500_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = regmap; + data->client = client; + + ret = regmap_read(regmap, MC34VR500_DEVICEID, ®); + if (ret < 0) + return ret; + + if (reg != MC34VR500_DEVICEID_VALUE) + return -ENODEV; + + ret = regmap_read(regmap, MC34VR500_SILICONREVID, &revid); + if (ret < 0) + return ret; + + ret = regmap_read(regmap, MC34VR500_FABID, &fabid); + if (ret < 0) + return ret; + + dev_dbg(dev, "mc34vr500: revid 0x%x fabid 0x%x\n", revid, fabid); + + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, + data, + &mc34vr500_chip_info, + NULL); + data->hwmon_dev = hwmon_dev; + + if (client->irq) { + ret = devm_request_threaded_irq(dev, client->irq, NULL, + mc34vr500_process_interrupt, + IRQF_TRIGGER_RISING | + IRQF_ONESHOT | + IRQF_SHARED, + dev_name(dev), data); + if (ret) + return ret; + + /* clear interrupts */ + ret = regmap_write(regmap, MC34VR500_INTSTAT0, 0); + if (ret) + return ret; + + /* unmask interrupts */ + ret = regmap_write(regmap, MC34VR500_INTMASK0, + ~(LOWVINS_BIT | THERM110S_BIT)); + if (ret) + return ret; + } + + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct i2c_device_id mc34vr500_id[] = { + { "mc34vr500", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, mc34vr500_id); + +static struct i2c_driver mc34vr500_driver = { + .driver = { + .name = "mc34vr500", + }, + .probe_new = mc34vr500_probe, + .id_table = mc34vr500_id, +}; + +module_i2c_driver(mc34vr500_driver); + +MODULE_AUTHOR("Mario Kicherer <dev@xxxxxxxxxxxx>"); + +MODULE_DESCRIPTION("MC34VR500 driver"); +MODULE_LICENSE("GPL"); -- 2.34.1
