Add support to handle irq. When the temperature touch the limit value, the
driver can handle the interrupt.
Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
---
drivers/hwmon/lm90.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index caf01b0..80311ef 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -89,6 +89,8 @@
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
+#include <linux/interrupt.h>
+#include <linux/of_irq.h>
/*
* Addresses to scan
@@ -302,6 +304,7 @@ static const struct lm90_params lm90_params[] = {
struct lm90_data {
struct device *hwmon_dev;
struct mutex update_lock;
+ struct work_struct irq_work;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
int kind;
@@ -1418,6 +1421,29 @@ static void lm90_init_client(struct i2c_client *client)
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
+static void lm90_alert(struct i2c_client *client, unsigned int flag);
+
+static void lm90_irq_work(struct work_struct *work)
+{
+ struct lm90_data *data = container_of(work, struct lm90_data,
+ irq_work);
+ struct i2c_client *client = to_i2c_client(data->hwmon_dev->parent);
+
+ lm90_alert(client, 0);
+
+ enable_irq(client->irq);
+}
+
+static irqreturn_t lm90_irq(int irq, void *dev_id)
+{
+ struct lm90_data *data = dev_id;
+
+ disable_irq_nosync(irq);
+ schedule_work(&data->irq_work);
+
+ return IRQ_HANDLED;
+}
+
static int lm90_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1494,6 +1520,17 @@ static int lm90_probe(struct i2c_client *client,
goto exit_remove_files;
}
+ if (client->irq >= 0) {
+ INIT_WORK(&data->irq_work, lm90_irq_work);
+ dev_dbg(dev, "lm90 irq: %d\n", client->irq);
+ err = request_irq(client->irq, lm90_irq, IRQF_TRIGGER_LOW,
+ "lm90", data);
+ if (err < 0) {
+ dev_err(dev, "cannot request interrupt\n");
+ goto exit_remove_files;
+ }
+ }
+
return 0;
exit_remove_files:
@@ -1507,6 +1544,7 @@ static int lm90_remove(struct i2c_client *client)
{
struct lm90_data *data = i2c_get_clientdata(client);
+ free_irq(client->irq, data);
hwmon_device_unregister(data->hwmon_dev);
lm90_remove_files(client, data);
lm90_restore_conf(client, data);
--
1.7.9.5
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