Add support to handle irq. When the temperature touch the limit value, the driver can handle the interrupt.
Signed-off-by: Alexandre Courbot <[email protected]> Signed-off-by: Wei Ni <[email protected]> --- 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 -- 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
