Initial import

1 files changed, 511 insertions, 0 deletions

diff --git a/drivers/hwmon/adt7x10.c b/drivers/hwmon/adt7x10.c
new file mode 100644
index 000000000..98141f483
--- /dev/null
+++ b/drivers/hwmon/adt7x10.c
@@ -0,0 +1,511 @@
+/*
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/interrupt.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 {
+	const struct adt7x10_ops *ops;
+	const char		*name;
+	struct device		*hwmon_dev;
+	struct mutex		update_lock;
+	u8			config;
+	u8			oldconfig;
+	bool			valid;		/* true if registers valid */
+	unsigned long		last_updated;	/* In jiffies */
+	s16			temp[4];	/* Register values,
+						   0 = input
+						   1 = high
+						   2 = low
+						   3 = critical */
+	u8			hyst;		/* hysteresis offset */
+};
+
+static int adt7x10_read_byte(struct device *dev, u8 reg)
+{
+	struct adt7x10_data *d = dev_get_drvdata(dev);
+	return d->ops->read_byte(dev, reg);
+}
+
+static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data)
+{
+	struct adt7x10_data *d = dev_get_drvdata(dev);
+	return d->ops->write_byte(dev, reg, data);
+}
+
+static int adt7x10_read_word(struct device *dev, u8 reg)
+{
+	struct adt7x10_data *d = dev_get_drvdata(dev);
+	return d->ops->read_word(dev, reg);
+}
+
+static int adt7x10_write_word(struct device *dev, u8 reg, u16 data)
+{
+	struct adt7x10_data *d = dev_get_drvdata(dev);
+	return d->ops->write_word(dev, reg, data);
+}
+
+static const u8 ADT7X10_REG_TEMP[4] = {
+	ADT7X10_TEMPERATURE,		/* input */
+	ADT7X10_T_ALARM_HIGH,		/* high */
+	ADT7X10_T_ALARM_LOW,		/* low */
+	ADT7X10_T_CRIT,			/* critical */
+};
+
+static irqreturn_t adt7x10_irq_handler(int irq, void *private)
+{
+	struct device *dev = private;
+	int status;
+
+	status = adt7x10_read_byte(dev, ADT7X10_STATUS);
+	if (status < 0)
+		return IRQ_HANDLED;
+
+	if (status & ADT7X10_STAT_T_HIGH)
+		sysfs_notify(&dev->kobj, NULL, "temp1_max_alarm");
+	if (status & ADT7X10_STAT_T_LOW)
+		sysfs_notify(&dev->kobj, NULL, "temp1_min_alarm");
+	if (status & ADT7X10_STAT_T_CRIT)
+		sysfs_notify(&dev->kobj, NULL, "temp1_crit_alarm");
+
+	return IRQ_HANDLED;
+}
+
+static int adt7x10_temp_ready(struct device *dev)
+{
+	int i, status;
+
+	for (i = 0; i < 6; i++) {
+		status = adt7x10_read_byte(dev, ADT7X10_STATUS);
+		if (status < 0)
+			return status;
+		if (!(status & ADT7X10_STAT_NOT_RDY))
+			return 0;
+		msleep(60);
+	}
+	return -ETIMEDOUT;
+}
+
+static int adt7x10_update_temp(struct device *dev)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+	int ret = 0;
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+	    || !data->valid) {
+		int temp;
+
+		dev_dbg(dev, "Starting update\n");
+
+		ret = adt7x10_temp_ready(dev); /* check for new value */
+		if (ret)
+			goto abort;
+
+		temp = adt7x10_read_word(dev, ADT7X10_REG_TEMP[0]);
+		if (temp < 0) {
+			ret = temp;
+			dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
+				ADT7X10_REG_TEMP[0], ret);
+			goto abort;
+		}
+		data->temp[0] = temp;
+		data->last_updated = jiffies;
+		data->valid = true;
+	}
+
+abort:
+	mutex_unlock(&data->update_lock);
+	return ret;
+}
+
+static int adt7x10_fill_cache(struct device *dev)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+	int ret;
+	int i;
+
+	for (i = 1; i < ARRAY_SIZE(data->temp); i++) {
+		ret = adt7x10_read_word(dev, ADT7X10_REG_TEMP[i]);
+		if (ret < 0) {
+			dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
+				ADT7X10_REG_TEMP[i], ret);
+			return ret;
+		}
+		data->temp[i] = ret;
+	}
+
+	ret = adt7x10_read_byte(dev, ADT7X10_T_HYST);
+	if (ret < 0) {
+		dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
+				ADT7X10_T_HYST, ret);
+		return ret;
+	}
+	data->hyst = ret;
+
+	return 0;
+}
+
+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);
+}
+
+/*-----------------------------------------------------------------------*/
+
+/* sysfs attributes for hwmon */
+
+static ssize_t adt7x10_show_temp(struct device *dev,
+				 struct device_attribute *da,
+				 char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+
+	if (attr->index == 0) {
+		int ret;
+
+		ret = adt7x10_update_temp(dev);
+		if (ret)
+			return ret;
+	}
+
+	return sprintf(buf, "%d\n", ADT7X10_REG_TO_TEMP(data,
+		       data->temp[attr->index]));
+}
+
+static ssize_t adt7x10_set_temp(struct device *dev,
+				struct device_attribute *da,
+				const char *buf, size_t count)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+	int nr = attr->index;
+	long temp;
+	int ret;
+
+	ret = kstrtol(buf, 10, &temp);
+	if (ret)
+		return ret;
+
+	mutex_lock(&data->update_lock);
+	data->temp[nr] = ADT7X10_TEMP_TO_REG(temp);
+	ret = adt7x10_write_word(dev, ADT7X10_REG_TEMP[nr], data->temp[nr]);
+	if (ret)
+		count = ret;
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+static ssize_t adt7x10_show_t_hyst(struct device *dev,
+				   struct device_attribute *da,
+				   char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+	int nr = attr->index;
+	int hyst;
+
+	hyst = (data->hyst & ADT7X10_T_HYST_MASK) * 1000;
+
+	/*
+	 * hysteresis is stored as a 4 bit offset in the device, convert it
+	 * to an absolute value
+	 */
+	if (nr == 2)	/* min has positive offset, others have negative */
+		hyst = -hyst;
+	return sprintf(buf, "%d\n",
+		       ADT7X10_REG_TO_TEMP(data, data->temp[nr]) - hyst);
+}
+
+static ssize_t adt7x10_set_t_hyst(struct device *dev,
+				  struct device_attribute *da,
+				  const char *buf, size_t count)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+	int limit, ret;
+	long hyst;
+
+	ret = kstrtol(buf, 10, &hyst);
+	if (ret)
+		return ret;
+	/* convert absolute hysteresis value to a 4 bit delta value */
+	limit = ADT7X10_REG_TO_TEMP(data, data->temp[1]);
+	hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
+	data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000),
+				   0, ADT7X10_T_HYST_MASK);
+	ret = adt7x10_write_byte(dev, ADT7X10_T_HYST, data->hyst);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static ssize_t adt7x10_show_alarm(struct device *dev,
+				  struct device_attribute *da,
+				  char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+	int ret;
+
+	ret = adt7x10_read_byte(dev, ADT7X10_STATUS);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%d\n", !!(ret & attr->index));
+}
+
+static ssize_t adt7x10_show_name(struct device *dev,
+				 struct device_attribute *da,
+				 char *buf)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", data->name);
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7x10_show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
+			  adt7x10_show_temp, adt7x10_set_temp, 1);
+static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
+			  adt7x10_show_temp, adt7x10_set_temp, 2);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
+			  adt7x10_show_temp, adt7x10_set_temp, 3);
+static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
+			  adt7x10_show_t_hyst, adt7x10_set_t_hyst, 1);
+static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
+			  adt7x10_show_t_hyst, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
+			  adt7x10_show_t_hyst, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7x10_show_alarm,
+			  NULL, ADT7X10_STAT_T_LOW);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7x10_show_alarm,
+			  NULL, ADT7X10_STAT_T_HIGH);
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7x10_show_alarm,
+			  NULL, ADT7X10_STAT_T_CRIT);
+static DEVICE_ATTR(name, S_IRUGO, adt7x10_show_name, NULL);
+
+static struct attribute *adt7x10_attributes[] = {
+	&sensor_dev_attr_temp1_input.dev_attr.attr,
+	&sensor_dev_attr_temp1_max.dev_attr.attr,
+	&sensor_dev_attr_temp1_min.dev_attr.attr,
+	&sensor_dev_attr_temp1_crit.dev_attr.attr,
+	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
+	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group adt7x10_group = {
+	.attrs = adt7x10_attributes,
+};
+
+int adt7x10_probe(struct device *dev, const char *name, int irq,
+		  const struct adt7x10_ops *ops)
+{
+	struct adt7x10_data *data;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->ops = ops;
+	data->name = name;
+
+	dev_set_drvdata(dev, data);
+	mutex_init(&data->update_lock);
+
+	/* configure as specified */
+	ret = adt7x10_read_byte(dev, ADT7X10_CONFIG);
+	if (ret < 0) {
+		dev_dbg(dev, "Can't read config? %d\n", ret);
+		return ret;
+	}
+	data->oldconfig = ret;
+
+	/*
+	 * 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 = adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
+		if (ret)
+			return ret;
+	}
+	dev_dbg(dev, "Config %02x\n", data->config);
+
+	ret = adt7x10_fill_cache(dev);
+	if (ret)
+		goto exit_restore;
+
+	/* Register sysfs hooks */
+	ret = sysfs_create_group(&dev->kobj, &adt7x10_group);
+	if (ret)
+		goto exit_restore;
+
+	/*
+	 * The I2C device will already have it's own 'name' attribute, but for
+	 * the SPI device we need to register it. name will only be non NULL if
+	 * the device doesn't register the 'name' attribute on its own.
+	 */
+	if (name) {
+		ret = device_create_file(dev, &dev_attr_name);
+		if (ret)
+			goto exit_remove;
+	}
+
+	data->hwmon_dev = hwmon_device_register(dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		ret = PTR_ERR(data->hwmon_dev);
+		goto exit_remove_name;
+	}
+
+	if (irq > 0) {
+		ret = request_threaded_irq(irq, NULL, adt7x10_irq_handler,
+				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				dev_name(dev), dev);
+		if (ret)
+			goto exit_hwmon_device_unregister;
+	}
+
+	return 0;
+
+exit_hwmon_device_unregister:
+	hwmon_device_unregister(data->hwmon_dev);
+exit_remove_name:
+	if (name)
+		device_remove_file(dev, &dev_attr_name);
+exit_remove:
+	sysfs_remove_group(&dev->kobj, &adt7x10_group);
+exit_restore:
+	adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(adt7x10_probe);
+
+int adt7x10_remove(struct device *dev, int irq)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+	if (irq > 0)
+		free_irq(irq, dev);
+
+	hwmon_device_unregister(data->hwmon_dev);
+	if (data->name)
+		device_remove_file(dev, &dev_attr_name);
+	sysfs_remove_group(&dev->kobj, &adt7x10_group);
+	if (data->oldconfig != data->config)
+		adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(adt7x10_remove);
+
+#ifdef CONFIG_PM_SLEEP
+
+static int adt7x10_suspend(struct device *dev)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+	return adt7x10_write_byte(dev, ADT7X10_CONFIG,
+		data->config | ADT7X10_PD);
+}
+
+static int adt7x10_resume(struct device *dev)
+{
+	struct adt7x10_data *data = dev_get_drvdata(dev);
+
+	return adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
+}
+
+SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
+EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops);
+
+#endif /* CONFIG_PM_SLEEP */
+
+MODULE_AUTHOR("Hartmut Knaack");
+MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
+MODULE_LICENSE("GPL");