From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Ni Subject: [RFC PATCH 3/9] hwmon: (lm90) add support to handle irq Date: Mon, 18 Feb 2013 19:30:25 +0800 Message-ID: <1361187031-3679-4-git-send-email-wni@nvidia.com> References: <1361187031-3679-1-git-send-email-wni@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1361187031-3679-1-git-send-email-wni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: durgadoss.r-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, rui.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, MLongnecker-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, lm-sensors-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TZX6JHB/w77yyCwEArCW2h5@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Wei Ni , Alexandre Courbot List-Id: devicetree@vger.kernel.org Add support to handle irq. When the temperature touch the limit value, the driver can handle the interrupt. Signed-off-by: Alexandre Courbot Signed-off-by: Wei Ni --- 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 #include #include +#include +#include /* * 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