1 files changed, 419 insertions, 0 deletions
diff --git a/drivers/hwmon/adt7x10.c b/drivers/hwmon/adt7x10.c
new file mode 100644
index 000000000..da67734ed
--- /dev/null
+++ b/drivers/hwmon/adt7x10.c
@@ -0,0 +1,419 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
+ *	 monitoring
+ * This driver handles the ADT7410 and compatible digital temperature sensors.
+ * Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
+ * based on lm75.c by Frodo Looijaard <frodol@dds.nl>
+ * and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/hwmon.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+
+#include "adt7x10.h"
+
+/*
+ * ADT7X10 status
+ */
+#define ADT7X10_STAT_T_LOW		(1 << 4)
+#define ADT7X10_STAT_T_HIGH		(1 << 5)
+#define ADT7X10_STAT_T_CRIT		(1 << 6)
+#define ADT7X10_STAT_NOT_RDY		(1 << 7)
+
+/*
+ * ADT7X10 config
+ */
+#define ADT7X10_FAULT_QUEUE_MASK	(1 << 0 | 1 << 1)
+#define ADT7X10_CT_POLARITY		(1 << 2)
+#define ADT7X10_INT_POLARITY		(1 << 3)
+#define ADT7X10_EVENT_MODE		(1 << 4)
+#define ADT7X10_MODE_MASK		(1 << 5 | 1 << 6)
+#define ADT7X10_FULL			(0 << 5 | 0 << 6)
+#define ADT7X10_PD			(1 << 5 | 1 << 6)
+#define ADT7X10_RESOLUTION		(1 << 7)
+
+/*
+ * ADT7X10 masks
+ */
+#define ADT7X10_T13_VALUE_MASK		0xFFF8
+#define ADT7X10_T_HYST_MASK		0xF
+
+/* straight from the datasheet */
+#define ADT7X10_TEMP_MIN (-55000)
+#define ADT7X10_TEMP_MAX 150000
+
+/* Each client has this additional data */
+struct adt7x10_data {
+	struct regmap		*regmap;
+	struct mutex		update_lock;
+	u8			config;
+	u8			oldconfig;
+	bool			valid;		/* true if temperature valid */
+};
+
+enum {
+	adt7x10_temperature = 0,
+	adt7x10_t_alarm_high,
+	adt7x10_t_alarm_low,
+	adt7x10_t_crit,
+};
+
+static const u8 ADT7X10_REG_TEMP[] = {
+	[adt7x10_temperature] = ADT7X10_TEMPERATURE,		/* input */
+	[adt7x10_t_alarm_high] = ADT7X10_T_ALARM_HIGH,		/* high */
+	[adt7x10_t_alarm_low] = ADT7X10_T_ALARM_LOW,		/* low */
+	[adt7x10_t_crit] = ADT7X10_T_CRIT,			/* critical */
+};
+
+static irqreturn_t adt7x10_irq_handler(int irq, void *private)
+{
+	struct device *dev = private;
+	struct adt7x10_data *d = dev_get_drvdata(dev);
+	unsigned int status;
+	int ret;
+
+	ret = regmap_read(d->regmap, ADT7X10_STATUS, &status);
+	if (ret < 0)
+		return IRQ_HANDLED;
+
+	if (status & ADT7X10_STAT_T_HIGH)
+		hwmon_notify_event(dev, hwmon_temp, hwmon_temp_max_alarm, 0);
+	if (status & ADT7X10_STAT_T_LOW)
+		hwmon_notify_event(dev, hwmon_temp, hwmon_temp_min_alarm, 0);
+	if (status & ADT7X10_STAT_T_CRIT)
+		hwmon_notify_event(dev, hwmon_temp, hwmon_temp_crit_alarm, 0);
+
+	return IRQ_HANDLED;
+}
+
+static int adt7x10_temp_ready(struct regmap *regmap)
+{
+	unsigned int status;
+	int i, ret;
+
+	for (i = 0; i < 6; i++) {
+		ret = regmap_read(regmap, ADT7X10_STATUS, &status);
+		if (ret < 0)
+			return ret;
+		if (!(status & ADT7X10_STAT_NOT_RDY))
+			return 0;
+		msleep(60);
+	}
+	return -ETIMEDOUT;
+}
+
+static s16 ADT7X10_TEMP_TO_REG(long temp)
+{
+	return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
+					   ADT7X10_TEMP_MAX) * 128, 1000);
+}
+
+static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
+{
+	/* in 13 bit mode, bits 0-2 are status flags - mask them out */
+	if (!(data->config & ADT7X10_RESOLUTION))
+		reg &= ADT7X10_T13_VALUE_MASK;
+	/*
+	 * temperature is stored in twos complement format, in steps of
+	 * 1/128°C
+	 */
+	return DIV_ROUND_CLOSEST(reg * 1000, 128);
+}
+
+/*-----------------------------------------------------------------------*/
+
+static int adt7x10_temp_read(struct adt7x10_data *data, int index, long *val)
+{
+	unsigned int regval;
+	int ret;
+
+	mutex_lock(&data->update_lock);
+	if (index == adt7x10_temperature && !data->valid) {
+		/* wait for valid temperature */
+		ret = adt7x10_temp_ready(data->regmap);
+		if (ret) {
+			mutex_unlock(&data->update_lock);
+			return ret;
+		}
+		data->valid = true;
+	}
+	mutex_unlock(&data->update_lock);
+
+	ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &regval);
+	if (ret)
+		return ret;
+
+	*val = ADT7X10_REG_TO_TEMP(data, regval);
+	return 0;
+}
+
+static int adt7x10_temp_write(struct adt7x10_data *data, int index, long temp)
+{
+	int ret;
+
+	mutex_lock(&data->update_lock);
+	ret = regmap_write(data->regmap, ADT7X10_REG_TEMP[index],
+			   ADT7X10_TEMP_TO_REG(temp));
+	mutex_unlock(&data->update_lock);
+	return ret;
+}
+
+static int adt7x10_hyst_read(struct adt7x10_data *data, int index, long *val)
+{
+	int hyst, temp, ret;
+
+	mutex_lock(&data->update_lock);
+	ret = regmap_read(data->regmap, ADT7X10_T_HYST, &hyst);
+	if (ret) {
+		mutex_unlock(&data->update_lock);
+		return ret;
+	}
+
+	ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &temp);
+	mutex_unlock(&data->update_lock);
+	if (ret)
+		return ret;
+
+	hyst = (hyst & ADT7X10_T_HYST_MASK) * 1000;
+
+	/*
+	 * hysteresis is stored as a 4 bit offset in the device, convert it
+	 * to an absolute value
+	 */
+	/* min has positive offset, others have negative */
+	if (index == adt7x10_t_alarm_low)
+		hyst = -hyst;
+
+	*val = ADT7X10_REG_TO_TEMP(data, temp) - hyst;
+	return 0;
+}
+
+static int adt7x10_hyst_write(struct adt7x10_data *data, long hyst)
+{
+	unsigned int regval;
+	int limit, ret;
+
+	mutex_lock(&data->update_lock);
+
+	/* convert absolute hysteresis value to a 4 bit delta value */
+	ret = regmap_read(data->regmap, ADT7X10_T_ALARM_HIGH, &regval);
+	if (ret < 0)
+		goto abort;
+
+	limit = ADT7X10_REG_TO_TEMP(data, regval);
+
+	hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
+	regval = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
+			   ADT7X10_T_HYST_MASK);
+	ret = regmap_write(data->regmap, ADT7X10_T_HYST, regval);
+abort:
+	mutex_unlock(&data->update_lock);
+	return ret;
+}
+
+static int adt7x10_alarm_read(struct adt7x10_data *data, int index, long *val)
+{
+	unsigned int status;
+	int ret;
+
+	ret = regmap_read(data->regmap, ADT7X10_STATUS, &status);
+	if (ret < 0)
+		return ret;
+
+	*val = !!(status & index);
+
+	return 0;
+}
+
+static umode_t adt7x10_is_visible(const void *data,
+				  enum hwmon_sensor_types type,
+				  u32 attr, int channel)
+{
+	switch (attr) {
+	case hwmon_temp_max:
+	case hwmon_temp_min:
+	case hwmon_temp_crit:
+	case hwmon_temp_max_hyst:
+		return 0644;
+	case hwmon_temp_input:
+	case hwmon_temp_min_alarm:
+	case hwmon_temp_max_alarm:
+	case hwmon_temp_crit_alarm:
+	case hwmon_temp_min_hyst:
+	case hwmon_temp_crit_hyst:
+		return 0444;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int adt7x10_read(struct device *dev, enum hwmon_sensor_types type,
+			u32 attr, int channel, long *val)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+	switch (attr) {
+	case hwmon_temp_input:
+		return adt7x10_temp_read(data, adt7x10_temperature, val);
+	case hwmon_temp_max:
+		return adt7x10_temp_read(data, adt7x10_t_alarm_high, val);
+	case hwmon_temp_min:
+		return adt7x10_temp_read(data, adt7x10_t_alarm_low, val);
+	case hwmon_temp_crit:
+		return adt7x10_temp_read(data, adt7x10_t_crit, val);
+	case hwmon_temp_max_hyst:
+		return adt7x10_hyst_read(data, adt7x10_t_alarm_high, val);
+	case hwmon_temp_min_hyst:
+		return adt7x10_hyst_read(data, adt7x10_t_alarm_low, val);
+	case hwmon_temp_crit_hyst:
+		return adt7x10_hyst_read(data, adt7x10_t_crit, val);
+	case hwmon_temp_min_alarm:
+		return adt7x10_alarm_read(data, ADT7X10_STAT_T_LOW, val);
+	case hwmon_temp_max_alarm:
+		return adt7x10_alarm_read(data, ADT7X10_STAT_T_HIGH, val);
+	case hwmon_temp_crit_alarm:
+		return adt7x10_alarm_read(data, ADT7X10_STAT_T_CRIT, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int adt7x10_write(struct device *dev, enum hwmon_sensor_types type,
+			 u32 attr, int channel, long val)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+	switch (attr) {
+	case hwmon_temp_max:
+		return adt7x10_temp_write(data, adt7x10_t_alarm_high, val);
+	case hwmon_temp_min:
+		return adt7x10_temp_write(data, adt7x10_t_alarm_low, val);
+	case hwmon_temp_crit:
+		return adt7x10_temp_write(data, adt7x10_t_crit, val);
+	case hwmon_temp_max_hyst:
+		return adt7x10_hyst_write(data, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static const struct hwmon_channel_info *adt7x10_info[] = {
+	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
+			   HWMON_T_CRIT | HWMON_T_MAX_HYST | HWMON_T_MIN_HYST |
+			   HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
+			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM),
+	NULL,
+};
+
+static const struct hwmon_ops adt7x10_hwmon_ops = {
+	.is_visible = adt7x10_is_visible,
+	.read = adt7x10_read,
+	.write = adt7x10_write,
+};
+
+static const struct hwmon_chip_info adt7x10_chip_info = {
+	.ops = &adt7x10_hwmon_ops,
+	.info = adt7x10_info,
+};
+
+static void adt7x10_restore_config(void *private)
+{
+	struct adt7x10_data *data = private;
+
+	regmap_write(data->regmap, ADT7X10_CONFIG, data->oldconfig);
+}
+
+int adt7x10_probe(struct device *dev, const char *name, int irq,
+		  struct regmap *regmap)
+{
+	struct adt7x10_data *data;
+	unsigned int config;
+	struct device *hdev;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->regmap = regmap;
+
+	dev_set_drvdata(dev, data);
+	mutex_init(&data->update_lock);
+
+	/* configure as specified */
+	ret = regmap_read(regmap, ADT7X10_CONFIG, &config);
+	if (ret < 0) {
+		dev_dbg(dev, "Can't read config? %d\n", ret);
+		return ret;
+	}
+	data->oldconfig = config;
+
+	/*
+	 * Set to 16 bit resolution, continous conversion and comparator mode.
+	 */
+	data->config = data->oldconfig;
+	data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
+			ADT7X10_INT_POLARITY);
+	data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;
+
+	if (data->config != data->oldconfig) {
+		ret = regmap_write(regmap, ADT7X10_CONFIG, data->config);
+		if (ret)
+			return ret;
+		ret = devm_add_action_or_reset(dev, adt7x10_restore_config, data);
+		if (ret)
+			return ret;
+	}
+	dev_dbg(dev, "Config %02x\n", data->config);
+
+	hdev = devm_hwmon_device_register_with_info(dev, name, data,
+						    &adt7x10_chip_info, NULL);
+	if (IS_ERR(hdev))
+		return PTR_ERR(hdev);
+
+	if (irq > 0) {
+		ret = devm_request_threaded_irq(dev, irq, NULL,
+						adt7x10_irq_handler,
+						IRQF_TRIGGER_FALLING |
+						IRQF_ONESHOT,
+						dev_name(dev), hdev);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(adt7x10_probe);
+
+static int adt7x10_suspend(struct device *dev)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+	return regmap_write(data->regmap, ADT7X10_CONFIG,
+			    data->config | ADT7X10_PD);
+}
+
+static int adt7x10_resume(struct device *dev)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+	return regmap_write(data->regmap, ADT7X10_CONFIG, data->config);
+}
+
+EXPORT_SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
+
+MODULE_AUTHOR("Hartmut Knaack");
+MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
+MODULE_LICENSE("GPL");