hwmon: add initial NXP MC34VR500 PMIC monitoring support
Add initial monitoring support for the MC34VR500 PMIC. In its current state, input voltage and temperature alarms are reported to hwmon. Datasheet: - https://www.nxp.com/docs/en/data-sheet/MC34VR500.pdf Signed-off-by: Mario Kicherer <dev@kicherer.org> Link: https://lore.kernel.org/r/20230118123019.3041303-4-dev@kicherer.org [groeck: Silence stray compiler warning, terminate struct of_device_id] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Mario Kicherer
Guenter Roeck
parent
a66c914791
commit
07830d9ab3
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@ -1175,6 +1175,13 @@ config SENSORS_MAX31790
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This driver can also be built as a module. If so, the module
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will be called max31790.
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config SENSORS_MC34VR500
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tristate "NXP MC34VR500 hardware monitoring driver"
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depends on I2C
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help
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If you say yes here you get support for the temperature and input
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voltage sensors of the NXP MC34VR500.
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config SENSORS_MCP3021
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tristate "Microchip MCP3021 and compatibles"
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depends on I2C
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@ -150,6 +150,7 @@ obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
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obj-$(CONFIG_SENSORS_MAX6697) += max6697.o
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obj-$(CONFIG_SENSORS_MAX31790) += max31790.o
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obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
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obj-$(CONFIG_SENSORS_MC34VR500) += mc34vr500.o
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obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
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obj-$(CONFIG_SENSORS_TC654) += tc654.o
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obj-$(CONFIG_SENSORS_TPS23861) += tps23861.o
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@ -0,0 +1,263 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* An hwmon driver for the NXP MC34VR500 PMIC
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*
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* Author: Mario Kicherer <dev@kicherer.org>
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*/
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#include <linux/bits.h>
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#include <linux/dev_printk.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/hwmon.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/irqreturn.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#define MC34VR500_I2C_ADDR 0x08
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#define MC34VR500_DEVICEID_VALUE 0x14
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/* INTSENSE0 */
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#define ENS_BIT BIT(0)
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#define LOWVINS_BIT BIT(1)
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#define THERM110S_BIT BIT(2)
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#define THERM120S_BIT BIT(3)
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#define THERM125S_BIT BIT(4)
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#define THERM130S_BIT BIT(5)
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#define MC34VR500_DEVICEID 0x00
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#define MC34VR500_SILICONREVID 0x03
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#define MC34VR500_FABID 0x04
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#define MC34VR500_INTSTAT0 0x05
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#define MC34VR500_INTMASK0 0x06
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#define MC34VR500_INTSENSE0 0x07
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struct mc34vr500_data {
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struct device *hwmon_dev;
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struct regmap *regmap;
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};
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static irqreturn_t mc34vr500_process_interrupt(int irq, void *userdata)
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{
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struct mc34vr500_data *data = (struct mc34vr500_data *)userdata;
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unsigned int reg;
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int ret;
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ret = regmap_read(data->regmap, MC34VR500_INTSTAT0, ®);
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if (ret < 0)
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return IRQ_HANDLED;
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if (reg) {
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if (reg & LOWVINS_BIT)
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hwmon_notify_event(data->hwmon_dev, hwmon_in,
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hwmon_in_min_alarm, 0);
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if (reg & THERM110S_BIT)
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hwmon_notify_event(data->hwmon_dev, hwmon_temp,
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hwmon_temp_max_alarm, 0);
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if (reg & THERM120S_BIT)
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hwmon_notify_event(data->hwmon_dev, hwmon_temp,
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hwmon_temp_crit_alarm, 0);
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if (reg & THERM130S_BIT)
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hwmon_notify_event(data->hwmon_dev, hwmon_temp,
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hwmon_temp_emergency_alarm, 0);
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/* write 1 to clear */
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regmap_write(data->regmap, MC34VR500_INTSTAT0, LOWVINS_BIT |
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THERM110S_BIT | THERM120S_BIT | THERM130S_BIT);
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}
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return IRQ_HANDLED;
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}
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static umode_t mc34vr500_is_visible(const void *data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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switch (attr) {
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case hwmon_in_min_alarm:
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case hwmon_temp_max_alarm:
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case hwmon_temp_crit_alarm:
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case hwmon_temp_emergency_alarm:
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return 0444;
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default:
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break;
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}
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return 0;
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}
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static int mc34vr500_alarm_read(struct mc34vr500_data *data, int index,
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long *val)
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{
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unsigned int reg;
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int ret;
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ret = regmap_read(data->regmap, MC34VR500_INTSENSE0, ®);
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if (ret < 0)
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return ret;
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*val = !!(reg & index);
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return 0;
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}
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static int mc34vr500_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct mc34vr500_data *data = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_in:
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switch (attr) {
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case hwmon_in_min_alarm:
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return mc34vr500_alarm_read(data, LOWVINS_BIT, val);
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default:
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return -EOPNOTSUPP;
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}
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_max_alarm:
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return mc34vr500_alarm_read(data, THERM110S_BIT, val);
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case hwmon_temp_crit_alarm:
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return mc34vr500_alarm_read(data, THERM120S_BIT, val);
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case hwmon_temp_emergency_alarm:
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return mc34vr500_alarm_read(data, THERM130S_BIT, val);
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default:
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return -EOPNOTSUPP;
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}
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default:
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return -EOPNOTSUPP;
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}
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}
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static const struct hwmon_channel_info *mc34vr500_info[] = {
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HWMON_CHANNEL_INFO(in, HWMON_I_MIN_ALARM),
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HWMON_CHANNEL_INFO(temp, HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM
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| HWMON_T_EMERGENCY_ALARM),
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NULL,
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};
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static const struct hwmon_ops mc34vr500_hwmon_ops = {
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.is_visible = mc34vr500_is_visible,
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.read = mc34vr500_read,
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};
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static const struct hwmon_chip_info mc34vr500_chip_info = {
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.ops = &mc34vr500_hwmon_ops,
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.info = mc34vr500_info,
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};
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static const struct regmap_config mc34vr500_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MC34VR500_INTSENSE0,
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};
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static int mc34vr500_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct mc34vr500_data *data;
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struct device *hwmon_dev;
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int ret;
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unsigned int reg, revid, fabid;
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struct regmap *regmap;
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regmap = devm_regmap_init_i2c(client, &mc34vr500_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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data = devm_kzalloc(dev, sizeof(struct mc34vr500_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->regmap = regmap;
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ret = regmap_read(regmap, MC34VR500_DEVICEID, ®);
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if (ret < 0)
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return ret;
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if (reg != MC34VR500_DEVICEID_VALUE)
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return -ENODEV;
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ret = regmap_read(regmap, MC34VR500_SILICONREVID, &revid);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, MC34VR500_FABID, &fabid);
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if (ret < 0)
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return ret;
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dev_dbg(dev, "mc34vr500: revid 0x%x fabid 0x%x\n", revid, fabid);
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hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
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data,
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&mc34vr500_chip_info,
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NULL);
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if (IS_ERR(hwmon_dev))
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return PTR_ERR(hwmon_dev);
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data->hwmon_dev = hwmon_dev;
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if (client->irq) {
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ret = devm_request_threaded_irq(dev, client->irq, NULL,
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mc34vr500_process_interrupt,
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IRQF_TRIGGER_RISING |
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IRQF_ONESHOT |
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IRQF_SHARED,
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dev_name(dev), data);
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if (ret)
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return ret;
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/* write 1 to clear interrupts */
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ret = regmap_write(regmap, MC34VR500_INTSTAT0, LOWVINS_BIT |
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THERM110S_BIT | THERM120S_BIT |
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THERM130S_BIT);
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if (ret)
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return ret;
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/* unmask interrupts */
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ret = regmap_write(regmap, MC34VR500_INTMASK0,
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(unsigned int) ~(LOWVINS_BIT | THERM110S_BIT |
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THERM120S_BIT | THERM130S_BIT));
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if (ret)
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return ret;
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}
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return 0;
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}
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static const struct i2c_device_id mc34vr500_id[] = {
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{ "mc34vr500", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, mc34vr500_id);
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static const struct of_device_id __maybe_unused mc34vr500_of_match[] = {
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{ .compatible = "nxp,mc34vr500" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, mc34vr500_of_match);
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static struct i2c_driver mc34vr500_driver = {
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.driver = {
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.name = "mc34vr500",
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.of_match_table = of_match_ptr(mc34vr500_of_match),
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},
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.probe_new = mc34vr500_probe,
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.id_table = mc34vr500_id,
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};
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module_i2c_driver(mc34vr500_driver);
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MODULE_AUTHOR("Mario Kicherer <dev@kicherer.org>");
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MODULE_DESCRIPTION("MC34VR500 driver");
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MODULE_LICENSE("GPL");
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