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-rw-r--r--Documentation/hwmon/pc8742713
-rw-r--r--drivers/hwmon/Kconfig3
-rw-r--r--drivers/hwmon/pc87427.c271
3 files changed, 282 insertions, 5 deletions
diff --git a/Documentation/hwmon/pc87427 b/Documentation/hwmon/pc87427
index db5cc1227a83..3282bf39d67d 100644
--- a/Documentation/hwmon/pc87427
+++ b/Documentation/hwmon/pc87427
@@ -20,8 +20,8 @@ The National Semiconductor Super I/O chip includes complete hardware
monitoring capabilities. It can monitor up to 18 voltages, 8 fans and
6 temperature sensors. Only the fans are supported at the moment.
-This chip also has fan controlling features, which are not yet supported
-by this driver either.
+This chip also has fan controlling features (up to 4 PWM outputs),
+which are partly supported by this driver.
The driver assumes that no more than one chip is present, which seems
reasonable.
@@ -36,3 +36,12 @@ signal. Speeds down to 83 RPM can be measured.
An alarm is triggered if the rotation speed drops below a programmable
limit. Another alarm is triggered if the speed is too low to be measured
(including stalled or missing fan).
+
+
+Fan Speed Control
+-----------------
+
+Fan speed can be controlled by PWM outputs. There are 4 possible modes:
+always off, always on, manual and automatic. The latter isn't supported
+by the driver: you can only return to that mode if it was the original
+setting, and the configuration interface is missing.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index d50e9fa8016f..ea3d8dff684b 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -711,7 +711,8 @@ config SENSORS_PC87427
functions of the National Semiconductor PC87427 Super-I/O chip.
The chip has two distinct logical devices, one for fan speed
monitoring and control, and one for voltage and temperature
- monitoring. Only fan speed monitoring is supported right now.
+ monitoring. Only fan speed monitoring and control is supported
+ right now.
This driver can also be built as a module. If so, the module
will be called pc87427.
diff --git a/drivers/hwmon/pc87427.c b/drivers/hwmon/pc87427.c
index 0ac55ba6c6b8..869822785b4f 100644
--- a/drivers/hwmon/pc87427.c
+++ b/drivers/hwmon/pc87427.c
@@ -15,10 +15,10 @@
* Supports the following chips:
*
* Chip #vin #fan #pwm #temp devid
- * PC87427 - 8 - - 0xF2
+ * PC87427 - 8 4 - 0xF2
*
* This driver assumes that no more than one chip is present.
- * Only fan inputs are supported so far, although the chip can do much more.
+ * Only fans are supported so far, although the chip can do much more.
*/
#include <linux/module.h>
@@ -57,10 +57,16 @@ struct pc87427_data {
u16 fan[8]; /* register values */
u16 fan_min[8]; /* register values */
u8 fan_status[8]; /* register values */
+
+ u8 pwm_enabled; /* bit vector */
+ u8 pwm_auto_ok; /* bit vector */
+ u8 pwm_enable[4]; /* register values */
+ u8 pwm[4]; /* register values */
};
struct pc87427_sio_data {
u8 has_fanin;
+ u8 has_fanout;
};
/*
@@ -72,7 +78,9 @@ struct pc87427_sio_data {
#define SIOREG_CF2 0x22 /* Configuration 2 */
#define SIOREG_CF3 0x23 /* Configuration 3 */
#define SIOREG_CF4 0x24 /* Configuration 4 */
+#define SIOREG_CF5 0x25 /* Configuration 5 */
#define SIOREG_CFB 0x2B /* Configuration B */
+#define SIOREG_CFC 0x2C /* Configuration C */
#define SIOREG_CFD 0x2D /* Configuration D */
#define SIOREG_ACT 0x30 /* Device activation */
#define SIOREG_MAP 0x50 /* I/O or memory mapping */
@@ -188,6 +196,61 @@ static inline u16 fan_to_reg(unsigned long val)
}
/*
+ * PWM registers and conversions
+ */
+
+#define PC87427_REG_PWM_ENABLE 0x10
+#define PC87427_REG_PWM_DUTY 0x12
+
+#define PWM_ENABLE_MODE_MASK (7 << 4)
+#define PWM_ENABLE_CTLEN (1 << 0)
+
+#define PWM_MODE_MANUAL (0 << 4)
+#define PWM_MODE_AUTO (1 << 4)
+#define PWM_MODE_OFF (2 << 4)
+#define PWM_MODE_ON (7 << 4)
+
+/* Dedicated function to read all registers related to a given PWM output.
+ This saves us quite a few locks and bank selections.
+ Must be called with data->lock held.
+ nr is from 0 to 3 */
+static void pc87427_readall_pwm(struct pc87427_data *data, u8 nr)
+{
+ int iobase = data->address[LD_FAN];
+
+ outb(BANK_FC(nr), iobase + PC87427_REG_BANK);
+ data->pwm_enable[nr] = inb(iobase + PC87427_REG_PWM_ENABLE);
+ data->pwm[nr] = inb(iobase + PC87427_REG_PWM_DUTY);
+}
+
+static inline int pwm_enable_from_reg(u8 reg)
+{
+ switch (reg & PWM_ENABLE_MODE_MASK) {
+ case PWM_MODE_ON:
+ return 0;
+ case PWM_MODE_MANUAL:
+ case PWM_MODE_OFF:
+ return 1;
+ case PWM_MODE_AUTO:
+ return 2;
+ default:
+ return -EPROTO;
+ }
+}
+
+static inline u8 pwm_enable_to_reg(unsigned long val, u8 pwmval)
+{
+ switch (val) {
+ default:
+ return PWM_MODE_ON;
+ case 1:
+ return pwmval ? PWM_MODE_MANUAL : PWM_MODE_OFF;
+ case 2:
+ return PWM_MODE_AUTO;
+ }
+}
+
+/*
* Data interface
*/
@@ -207,6 +270,14 @@ static struct pc87427_data *pc87427_update_device(struct device *dev)
continue;
pc87427_readall_fan(data, i);
}
+
+ /* PWM outputs */
+ for (i = 0; i < 4; i++) {
+ if (!(data->pwm_enabled & (1 << i)))
+ continue;
+ pc87427_readall_pwm(data, i);
+ }
+
data->last_updated = jiffies;
done:
@@ -384,6 +455,145 @@ static const struct attribute_group pc87427_group_fan[8] = {
{ .attrs = pc87427_attributes_fan[7] },
};
+/* Must be called with data->lock held and pc87427_readall_pwm() freshly
+ called */
+static void update_pwm_enable(struct pc87427_data *data, int nr, u8 mode)
+{
+ int iobase = data->address[LD_FAN];
+ data->pwm_enable[nr] &= ~PWM_ENABLE_MODE_MASK;
+ data->pwm_enable[nr] |= mode;
+ outb(data->pwm_enable[nr], iobase + PC87427_REG_PWM_ENABLE);
+}
+
+static ssize_t show_pwm_enable(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+ int pwm_enable;
+
+ pwm_enable = pwm_enable_from_reg(data->pwm_enable[nr]);
+ if (pwm_enable < 0)
+ return pwm_enable;
+ return sprintf(buf, "%d\n", pwm_enable);
+}
+
+static ssize_t set_pwm_enable(struct device *dev, struct device_attribute
+ *devattr, const char *buf, size_t count)
+{
+ struct pc87427_data *data = dev_get_drvdata(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+ unsigned long val;
+
+ if (strict_strtoul(buf, 10, &val) < 0 || val > 2)
+ return -EINVAL;
+ /* Can't go to automatic mode if it isn't configured */
+ if (val == 2 && !(data->pwm_auto_ok & (1 << nr)))
+ return -EINVAL;
+
+ mutex_lock(&data->lock);
+ pc87427_readall_pwm(data, nr);
+ update_pwm_enable(data, nr, pwm_enable_to_reg(val, data->pwm[nr]));
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
+static ssize_t show_pwm(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%d\n", (int)data->pwm[nr]);
+}
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute
+ *devattr, const char *buf, size_t count)
+{
+ struct pc87427_data *data = dev_get_drvdata(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+ unsigned long val;
+ int iobase = data->address[LD_FAN];
+ u8 mode;
+
+ if (strict_strtoul(buf, 10, &val) < 0 || val > 0xff)
+ return -EINVAL;
+
+ mutex_lock(&data->lock);
+ pc87427_readall_pwm(data, nr);
+ mode = data->pwm_enable[nr] & PWM_ENABLE_MODE_MASK;
+ if (mode != PWM_MODE_MANUAL && mode != PWM_MODE_OFF) {
+ dev_notice(dev, "Can't set PWM%d duty cycle while not in "
+ "manual mode\n", nr + 1);
+ mutex_unlock(&data->lock);
+ return -EPERM;
+ }
+
+ /* We may have to change the mode */
+ if (mode == PWM_MODE_MANUAL && val == 0) {
+ /* Transition from Manual to Off */
+ update_pwm_enable(data, nr, PWM_MODE_OFF);
+ mode = PWM_MODE_OFF;
+ dev_dbg(dev, "Switching PWM%d from %s to %s\n", nr + 1,
+ "manual", "off");
+ } else if (mode == PWM_MODE_OFF && val != 0) {
+ /* Transition from Off to Manual */
+ update_pwm_enable(data, nr, PWM_MODE_MANUAL);
+ mode = PWM_MODE_MANUAL;
+ dev_dbg(dev, "Switching PWM%d from %s to %s\n", nr + 1,
+ "off", "manual");
+ }
+
+ data->pwm[nr] = val;
+ if (mode == PWM_MODE_MANUAL)
+ outb(val, iobase + PC87427_REG_PWM_DUTY);
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
+static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
+ show_pwm_enable, set_pwm_enable, 0);
+static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
+ show_pwm_enable, set_pwm_enable, 1);
+static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
+ show_pwm_enable, set_pwm_enable, 2);
+static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO,
+ show_pwm_enable, set_pwm_enable, 3);
+
+static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0);
+static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1);
+static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 2);
+static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 3);
+
+static struct attribute *pc87427_attributes_pwm[4][3] = {
+ {
+ &sensor_dev_attr_pwm1_enable.dev_attr.attr,
+ &sensor_dev_attr_pwm1.dev_attr.attr,
+ NULL
+ }, {
+ &sensor_dev_attr_pwm2_enable.dev_attr.attr,
+ &sensor_dev_attr_pwm2.dev_attr.attr,
+ NULL
+ }, {
+ &sensor_dev_attr_pwm3_enable.dev_attr.attr,
+ &sensor_dev_attr_pwm3.dev_attr.attr,
+ NULL
+ }, {
+ &sensor_dev_attr_pwm4_enable.dev_attr.attr,
+ &sensor_dev_attr_pwm4.dev_attr.attr,
+ NULL
+ }
+};
+
+static const struct attribute_group pc87427_group_pwm[4] = {
+ { .attrs = pc87427_attributes_pwm[0] },
+ { .attrs = pc87427_attributes_pwm[1] },
+ { .attrs = pc87427_attributes_pwm[2] },
+ { .attrs = pc87427_attributes_pwm[3] },
+};
+
static ssize_t show_name(struct device *dev, struct device_attribute
*devattr, char *buf)
{
@@ -431,6 +641,25 @@ static void __devinit pc87427_init_device(struct device *dev)
}
data->fan_enabled = sio_data->has_fanin;
}
+
+ /* Check which PWM outputs are enabled */
+ for (i = 0; i < 4; i++) {
+ if (!(sio_data->has_fanout & (1 << i))) /* Not wired */
+ continue;
+ reg = pc87427_read8_bank(data, LD_FAN, BANK_FC(i),
+ PC87427_REG_PWM_ENABLE);
+ if (reg & PWM_ENABLE_CTLEN)
+ data->pwm_enabled |= (1 << i);
+
+ /* We don't expose an interface to reconfigure the automatic
+ fan control mode, so only allow to return to this mode if
+ it was originally set. */
+ if ((reg & PWM_ENABLE_MODE_MASK) == PWM_MODE_AUTO) {
+ dev_dbg(dev, "PWM%d is in automatic control mode\n",
+ i + 1);
+ data->pwm_auto_ok |= (1 << i);
+ }
+ }
}
static int __devinit pc87427_probe(struct platform_device *pdev)
@@ -474,6 +703,14 @@ static int __devinit pc87427_probe(struct platform_device *pdev)
if (err)
goto exit_remove_files;
}
+ for (i = 0; i < 4; i++) {
+ if (!(data->pwm_enabled & (1 << i)))
+ continue;
+ err = sysfs_create_group(&pdev->dev.kobj,
+ &pc87427_group_pwm[i]);
+ if (err)
+ goto exit_remove_files;
+ }
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
@@ -490,6 +727,11 @@ exit_remove_files:
continue;
sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]);
}
+ for (i = 0; i < 4; i++) {
+ if (!(data->pwm_enabled & (1 << i)))
+ continue;
+ sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_pwm[i]);
+ }
exit_release_region:
release_region(res->start, resource_size(res));
exit_kfree:
@@ -512,6 +754,11 @@ static int __devexit pc87427_remove(struct platform_device *pdev)
continue;
sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]);
}
+ for (i = 0; i < 4; i++) {
+ if (!(data->pwm_enabled & (1 << i)))
+ continue;
+ sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_pwm[i]);
+ }
platform_set_drvdata(pdev, NULL);
kfree(data);
@@ -648,6 +895,26 @@ static int __init pc87427_find(int sioaddr, unsigned short *address,
if ((cfg & (1 << 3)) && !(cfg_b & (1 << 5)))
sio_data->has_fanin |= (1 << 6); /* FANIN6 */
+ /* Check which fan outputs are wired */
+ sio_data->has_fanout = (1 << 0); /* FANOUT0 */
+ if (cfg_b & (1 << 0))
+ sio_data->has_fanout |= (1 << 3); /* FANOUT3 */
+
+ cfg = superio_inb(sioaddr, SIOREG_CFC);
+ if (!(cfg & (1 << 4))) {
+ if (cfg_b & (1 << 1))
+ sio_data->has_fanout |= (1 << 1); /* FANOUT1 */
+ if (cfg_b & (1 << 2))
+ sio_data->has_fanout |= (1 << 2); /* FANOUT2 */
+ }
+
+ /* FANOUT1 and FANOUT2 can each be routed to 2 different pins */
+ cfg = superio_inb(sioaddr, SIOREG_CF5);
+ if (cfg & (1 << 6))
+ sio_data->has_fanout |= (1 << 1); /* FANOUT1 */
+ if (cfg & (1 << 5))
+ sio_data->has_fanout |= (1 << 2); /* FANOUT2 */
+
exit:
superio_exit(sioaddr);
return err;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 19:55:08 +0000