--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * An hwmon driver for the NXP MC34VR500 PMIC
+ *
+ * Author: Mario Kicherer <dev@kicherer.org>
+ */
+
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/hwmon.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
+#include <linux/module.h>
+#include <linux/of.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 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);
+
+ /* write 1 to clear */
+ regmap_write(data->regmap, MC34VR500_INTSTAT0, LOWVINS_BIT |
+ THERM110S_BIT | THERM120S_BIT | THERM130S_BIT);
+ }
+
+ 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_INTSENSE0, ®);
+ if (ret < 0)
+ return ret;
+
+ *val = !!(reg & index);
+
+ 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;
+
+ 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);
+ if (IS_ERR(hwmon_dev))
+ return PTR_ERR(hwmon_dev);
+
+ 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;
+
+ /* write 1 to clear interrupts */
+ ret = regmap_write(regmap, MC34VR500_INTSTAT0, LOWVINS_BIT |
+ THERM110S_BIT | THERM120S_BIT |
+ THERM130S_BIT);
+ if (ret)
+ return ret;
+
+ /* unmask interrupts */
+ ret = regmap_write(regmap, MC34VR500_INTMASK0,
+ (unsigned int) ~(LOWVINS_BIT | THERM110S_BIT |
+ THERM120S_BIT | THERM130S_BIT));
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id mc34vr500_id[] = {
+ { "mc34vr500", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, mc34vr500_id);
+
+static const struct of_device_id __maybe_unused mc34vr500_of_match[] = {
+ { .compatible = "nxp,mc34vr500" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, mc34vr500_of_match);
+
+static struct i2c_driver mc34vr500_driver = {
+ .driver = {
+ .name = "mc34vr500",
+ .of_match_table = of_match_ptr(mc34vr500_of_match),
+ },
+ .probe_new = mc34vr500_probe,
+ .id_table = mc34vr500_id,
+};
+
+module_i2c_driver(mc34vr500_driver);
+
+MODULE_AUTHOR("Mario Kicherer <dev@kicherer.org>");
+
+MODULE_DESCRIPTION("MC34VR500 driver");
+MODULE_LICENSE("GPL");
projects / linux.git / commitdiff