From 4b5e536b0e948b5c756aa1d57218371c242f768d Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Tue, 12 Mar 2013 11:38:47 +0100 Subject: hwmon: (adt7x10) Add alarm interrupt support This allows an userspace application to poll() on the alarm files to get notified in case of a temperature threshold event. Signed-off-by: Lars-Peter Clausen Reviewed-by: Hartmut Knaack Signed-off-by: Guenter Roeck --- drivers/hwmon/adt7x10.c | 41 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 38 insertions(+), 3 deletions(-) (limited to 'drivers/hwmon/adt7x10.c') diff --git a/drivers/hwmon/adt7x10.c b/drivers/hwmon/adt7x10.c index 84b3dfc1c1cd..98141f483165 100644 --- a/drivers/hwmon/adt7x10.c +++ b/drivers/hwmon/adt7x10.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "adt7x10.h" @@ -112,6 +113,25 @@ static const u8 ADT7X10_REG_TEMP[4] = { 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; @@ -359,7 +379,7 @@ static const struct attribute_group adt7x10_group = { .attrs = adt7x10_attributes, }; -int adt7x10_probe(struct device *dev, const char *name, +int adt7x10_probe(struct device *dev, const char *name, int irq, const struct adt7x10_ops *ops) { struct adt7x10_data *data; @@ -387,8 +407,10 @@ int adt7x10_probe(struct device *dev, const char *name, * Set to 16 bit resolution, continous conversion and comparator mode. */ data->config = data->oldconfig; - data->config &= ~ADT7X10_MODE_MASK; + 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) @@ -422,8 +444,18 @@ int adt7x10_probe(struct device *dev, const char *name, 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); @@ -435,10 +467,13 @@ exit_restore: } EXPORT_SYMBOL_GPL(adt7x10_probe); -int adt7x10_remove(struct device *dev) +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); -- cgit