#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
#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);
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 * const 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;
ret = regmap_write(regmap, MC34VR500_INTSTAT0, LOWVINS_BIT |
THERM110S_BIT | THERM120S_BIT |
THERM130S_BIT);
if (ret)
return ret;
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" },
{ },
};
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 = 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");
