hwmon: (it87) Add support for old automatic fan speed control

Add support for the automatic fan speed control interface as
implemented by IT8705F chips up to revision F and IT8712F chips up to
revision G. This implementation fits very well in our standard sysfs
interface.

I implemented the old and not the new interface because the only chip
I have at hand is an old one, and the new interface is more difficult
to map to the standard sysfs interface. Adding support later should be
possible though, if someone with a supported chip is interested.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 180 insertions, 2 deletions

diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 8282282eb4c..bbb0c7443b9 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -192,6 +192,9 @@ static const u8 IT87_REG_FANX_MIN[]	= { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
 
 #define IT87_REG_CHIPID        0x58
 
+#define IT87_REG_AUTO_TEMP(nr, i) (0x60 + (nr) * 8 + (i))
+#define IT87_REG_AUTO_PWM(nr, i)  (0x65 + (nr) * 8 + (i))
+
 #define IN_TO_REG(val)  (SENSORS_LIMIT((((val) + 8)/16),0,255))
 #define IN_FROM_REG(val) ((val) * 16)
 
@@ -293,6 +296,10 @@ struct it87_data {
 	u8 pwm_ctrl[3];		/* Register value */
 	u8 pwm_duty[3];		/* Manual PWM value set by user (bit 6-0) */
 	u8 pwm_temp_map[3];	/* PWM to temp. chan. mapping (bits 1-0) */
+
+	/* Automatic fan speed control registers */
+	u8 auto_pwm[3][4];	/* [nr][3] is hard-coded */
+	s8 auto_temp[3][5];	/* [nr][0] is point1_temp_hyst */
 };
 
 static inline int has_16bit_fans(const struct it87_data *data)
@@ -307,6 +314,15 @@ static inline int has_16bit_fans(const struct it87_data *data)
 	    || data->type == it8720;
 }
 
+static inline int has_old_autopwm(const struct it87_data *data)
+{
+	/* The old automatic fan speed control interface is implemented
+	   by IT8705F chips up to revision F and IT8712F chips up to
+	   revision G. */
+	return (data->type == it87 && data->revision < 0x03)
+	    || (data->type == it8712 && data->revision < 0x08);
+}
+
 static int it87_probe(struct platform_device *pdev);
 static int __devexit it87_remove(struct platform_device *pdev);
 
@@ -813,6 +829,13 @@ static ssize_t set_pwm_temp_map(struct device *dev,
 	long val;
 	u8 reg;
 
+	/* This check can go away if we ever support automatic fan speed
+	   control on newer chips. */
+	if (!has_old_autopwm(data)) {
+		dev_notice(dev, "Mapping change disabled for safety reasons\n");
+		return -EINVAL;
+	}
+
 	if (strict_strtol(buf, 10, &val) < 0)
 		return -EINVAL;
 
@@ -842,6 +865,72 @@ static ssize_t set_pwm_temp_map(struct device *dev,
 	return count;
 }
 
+static ssize_t show_auto_pwm(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct it87_data *data = it87_update_device(dev);
+	struct sensor_device_attribute_2 *sensor_attr =
+			to_sensor_dev_attr_2(attr);
+	int nr = sensor_attr->nr;
+	int point = sensor_attr->index;
+
+	return sprintf(buf, "%d\n", PWM_FROM_REG(data->auto_pwm[nr][point]));
+}
+
+static ssize_t set_auto_pwm(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct it87_data *data = dev_get_drvdata(dev);
+	struct sensor_device_attribute_2 *sensor_attr =
+			to_sensor_dev_attr_2(attr);
+	int nr = sensor_attr->nr;
+	int point = sensor_attr->index;
+	long val;
+
+	if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 255)
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+	data->auto_pwm[nr][point] = PWM_TO_REG(val);
+	it87_write_value(data, IT87_REG_AUTO_PWM(nr, point),
+			 data->auto_pwm[nr][point]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+static ssize_t show_auto_temp(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct it87_data *data = it87_update_device(dev);
+	struct sensor_device_attribute_2 *sensor_attr =
+			to_sensor_dev_attr_2(attr);
+	int nr = sensor_attr->nr;
+	int point = sensor_attr->index;
+
+	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->auto_temp[nr][point]));
+}
+
+static ssize_t set_auto_temp(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct it87_data *data = dev_get_drvdata(dev);
+	struct sensor_device_attribute_2 *sensor_attr =
+			to_sensor_dev_attr_2(attr);
+	int nr = sensor_attr->nr;
+	int point = sensor_attr->index;
+	long val;
+
+	if (strict_strtol(buf, 10, &val) < 0 || val < -128000 || val > 127000)
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+	data->auto_temp[nr][point] = TEMP_TO_REG(val);
+	it87_write_value(data, IT87_REG_AUTO_TEMP(nr, point),
+			 data->auto_temp[nr][point]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
 #define show_fan_offset(offset)					\
 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,		\
 		show_fan, NULL, offset - 1);			\
@@ -863,8 +952,34 @@ static DEVICE_ATTR(pwm##offset##_freq,					\
 		(offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),		\
 		show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));	\
 static SENSOR_DEVICE_ATTR(pwm##offset##_auto_channels_temp,		\
-		S_IRUGO, show_pwm_temp_map, set_pwm_temp_map,		\
-		offset - 1);
+		S_IRUGO | S_IWUSR, show_pwm_temp_map, set_pwm_temp_map,	\
+		offset - 1);						\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_pwm,		\
+		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
+		offset - 1, 0);						\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_pwm,		\
+		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
+		offset - 1, 1);						\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_pwm,		\
+		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
+		offset - 1, 2);						\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_pwm,		\
+		S_IRUGO, show_auto_pwm, NULL, offset - 1, 3);		\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp,		\
+		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
+		offset - 1, 1);						\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp_hyst,	\
+		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
+		offset - 1, 0);						\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_temp,		\
+		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
+		offset - 1, 2);						\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_temp,		\
+		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
+		offset - 1, 3);						\
+static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_temp,		\
+		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
+		offset - 1, 4);
 
 show_pwm_offset(1);
 show_pwm_offset(2);
@@ -1219,6 +1334,47 @@ static const struct attribute_group it87_group_pwm[3] = {
 	{ .attrs = it87_attributes_pwm[2] },
 };
 
+static struct attribute *it87_attributes_autopwm[3][9+1] = { {
+	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
+	NULL
+}, {
+	&sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point1_temp_hyst.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
+	NULL
+}, {
+	&sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point1_temp_hyst.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,
+	&sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,
+	NULL
+} };
+
+static const struct attribute_group it87_group_autopwm[3] = {
+	{ .attrs = it87_attributes_autopwm[0] },
+	{ .attrs = it87_attributes_autopwm[1] },
+	{ .attrs = it87_attributes_autopwm[2] },
+};
+
 static struct attribute *it87_attributes_fan_beep[] = {
 	&sensor_dev_attr_fan1_beep.dev_attr.attr,
 	&sensor_dev_attr_fan2_beep.dev_attr.attr,
@@ -1382,6 +1538,9 @@ static void it87_remove_files(struct device *dev)
 		if (sio_data->skip_pwm & (1 << 0))
 			continue;
 		sysfs_remove_group(&dev->kobj, &it87_group_pwm[i]);
+		if (has_old_autopwm(data))
+			sysfs_remove_group(&dev->kobj,
+					   &it87_group_autopwm[i]);
 	}
 	if (!sio_data->skip_vid)
 		sysfs_remove_group(&dev->kobj, &it87_group_vid);
@@ -1491,6 +1650,13 @@ static int __devinit it87_probe(struct platform_device *pdev)
 						 &it87_group_pwm[i]);
 			if (err)
 				goto ERROR4;
+
+			if (!has_old_autopwm(data))
+				continue;
+			err = sysfs_create_group(&dev->kobj,
+						 &it87_group_autopwm[i]);
+			if (err)
+				goto ERROR4;
 		}
 	}
 
@@ -1624,6 +1790,7 @@ static void __devinit it87_init_device(struct platform_device *pdev)
 	for (i = 0; i < 3; i++) {
 		data->pwm_temp_map[i] = i;
 		data->pwm_duty[i] = 0x7f;	/* Full speed */
+		data->auto_pwm[i][3] = 0x7f;	/* Full speed, hard-coded */
 	}
 
 	/* Some chips seem to have default value 0xff for all limit
@@ -1703,6 +1870,17 @@ static void it87_update_pwm_ctrl(struct it87_data *data, int nr)
 		data->pwm_temp_map[nr] = data->pwm_ctrl[nr] & 0x03;
 	else				/* Manual mode */
 		data->pwm_duty[nr] = data->pwm_ctrl[nr] & 0x7f;
+
+	if (has_old_autopwm(data)) {
+		int i;
+
+		for (i = 0; i < 5 ; i++)
+			data->auto_temp[nr][i] = it87_read_value(data,
+						IT87_REG_AUTO_TEMP(nr, i));
+		for (i = 0; i < 3 ; i++)
+			data->auto_pwm[nr][i] = it87_read_value(data,
+						IT87_REG_AUTO_PWM(nr, i));
+	}
 }
 
 static struct it87_data *it87_update_device(struct device *dev)