From patchwork Mon Feb 18 11:30:25 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Ni X-Patchwork-Id: 2156971 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 90E54DF25A for ; Mon, 18 Feb 2013 11:34:53 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1U7OxV-0005bM-IS; Mon, 18 Feb 2013 11:32:33 +0000 Received: from hqemgate03.nvidia.com ([216.228.121.140]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1U7Ox2-0005U0-Q5 for linux-arm-kernel@lists.infradead.org; Mon, 18 Feb 2013 11:32:05 +0000 Received: from hqnvupgp07.nvidia.com (Not Verified[216.228.121.13]) by hqemgate03.nvidia.com id ; Mon, 18 Feb 2013 03:35:57 -0800 Received: from hqemhub01.nvidia.com ([172.20.150.30]) by hqnvupgp07.nvidia.com (PGP Universal service); Mon, 18 Feb 2013 03:30:32 -0800 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Mon, 18 Feb 2013 03:30:32 -0800 Received: from hkemhub02.nvidia.com (10.18.67.13) by hqemhub01.nvidia.com (172.20.150.30) with Microsoft SMTP Server (TLS) id 8.3.297.1; Mon, 18 Feb 2013 03:31:11 -0800 Received: from niwei-ubuntu.nvidia.com (10.18.67.5) by hkemhub02.nvidia.com (10.18.67.13) with Microsoft SMTP Server id 8.3.297.1; Mon, 18 Feb 2013 19:31:08 +0800 From: Wei Ni To: , , , 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> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1361187031-3679-1-git-send-email-wni@nvidia.com> References: <1361187031-3679-1-git-send-email-wni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130218_063205_020616_C8ED7FFE X-CRM114-Status: GOOD ( 13.78 ) X-Spam-Score: -4.6 (----) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-4.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [216.228.121.140 listed in list.dnswl.org] 3.0 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: linux-kernel@vger.kernel.orgrs.org, linux-pm@vger.kernel.org, devicetree-discuss@lists.ozlabs.org, Wei Ni , lm-sensors@lm-sensors.org, Alexandre Courbot , linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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);