Add support to handle irq. When the temperature touch the limit value, the driver can handle the interrupt.
Signed-off-by: Wei Ni <[email protected]> --- drivers/hwmon/lm90.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index 2cb7f8e..fce9dfa 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -89,6 +89,7 @@ #include <linux/err.h> #include <linux/mutex.h> #include <linux/sysfs.h> +#include <linux/interrupt.h> /* * Addresses to scan @@ -1423,6 +1424,18 @@ 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 irqreturn_t lm90_irq_thread(int irq, void *dev_id) +{ + struct lm90_data *data = dev_id; + struct i2c_client *client = to_i2c_client(data->hwmon_dev->parent); + + lm90_alert(client, 0); + + return IRQ_HANDLED; +} + static int lm90_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -1499,6 +1512,18 @@ static int lm90_probe(struct i2c_client *client, goto exit_remove_files; } + if (client->irq >= 0) { + dev_dbg(dev, "lm90 irq: %d\n", client->irq); + err = devm_request_threaded_irq(dev, client->irq, + NULL, lm90_irq_thread, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "lm90", data); + if (err < 0) { + dev_err(dev, "cannot request interrupt\n"); + goto exit_remove_files; + } + } + return 0; exit_remove_files: -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
