From patchwork Mon Sep 10 13:51:51 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamie Lentin X-Patchwork-Id: 1432351 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 68E4EDF28C for ; Mon, 10 Sep 2012 13:54:57 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TB4Od-000262-EW; Mon, 10 Sep 2012 13:51:28 +0000 Received: from bombadil.infradead.org ([2001:4830:2446:ff00:4687:fcff:fea6:5117]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TB4OF-0001xn-Tg for linux-arm-kernel@merlin.infradead.org; Mon, 10 Sep 2012 13:51:04 +0000 Received: from marmot.wormnet.eu ([2a03:9800:10:2d:3203:b3a5:8bdc:5b68]) by bombadil.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TB4OD-0004UI-Ve for linux-arm-kernel@lists.infradead.org; Mon, 10 Sep 2012 13:51:03 +0000 Received: from mijo.vandergast.wormnet.eu ([80.229.158.163] helo=bunsen.vandergast.wormnet.eu) by marmot.wormnet.eu with esmtpa (Exim 4.80) (envelope-from ) id 1TB4Nn-00071C-1W; Mon, 10 Sep 2012 14:50:35 +0100 From: Jamie Lentin To: Grant Likely , Rob Herring , Jean Delvare , Guenter Roeck , Jason Cooper , Andrew Lunn Subject: [PATCH V2 1/2] hwmon: Add devicetree bindings to gpio-fan Date: Mon, 10 Sep 2012 14:51:51 +0100 Message-Id: <1347285112-13542-2-git-send-email-jm@lentin.co.uk> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1347285112-13542-1-git-send-email-jm@lentin.co.uk> References: <1347035675-23907-1-git-send-email-jm@lentin.co.uk> <1347285112-13542-1-git-send-email-jm@lentin.co.uk> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20120910_095102_343883_F12650A4 X-CRM114-Status: GOOD ( 18.68 ) X-Spam-Score: -1.9 (-) X-Spam-Report: SpamAssassin version 3.3.2 on bombadil.infradead.org summary: Content analysis details: (-1.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: devicetree-discuss@lists.ozlabs.org, Jamie Lentin , 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: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Allow a gpio-fan to be defined in devicetree, see binding documentation for details. Changes since V1:- * Don't hide return codes [Guenter Roeck] * Remove typecast noise [Guenter Roeck] * Use of_find_property instead of counting u32s [Guenter Roeck] * Don't count GPIOs twice [Andrew Lunn] * Use of_prop_next_u32 to get records in a more obvious fashion * Use CONFIG_OF_GPIO instead of CONFIG_OF * Apply __devinitdata to of_gpio_fan_match [Andrew Lunn] Signed-off-by: Jamie Lentin --- .../devicetree/bindings/gpio/gpio-fan.txt | 25 +++++ drivers/hwmon/gpio-fan.c | 116 ++++++++++++++++++++ 2 files changed, 141 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-fan.txt diff --git a/Documentation/devicetree/bindings/gpio/gpio-fan.txt b/Documentation/devicetree/bindings/gpio/gpio-fan.txt new file mode 100644 index 0000000..2dd457a --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-fan.txt @@ -0,0 +1,25 @@ +Bindings for fan connected to GPIO lines + +Required properties: +- compatible : "gpio-fan" +- gpios: Specifies the pins that map to bits in the control value, + ordered MSB-->LSB. +- gpio-fan,speed-map: A mapping of possible fan RPM speeds and the + control value that should be set to achieve them. This array + must have the RPM values in ascending order. + +Optional properties: +- alarm-gpios: This pin going active indicates something is wrong with + the fan, and a udev event will be fired. + +Examples: + + gpio_fan { + compatible = "gpio-fan"; + gpios = <&gpio1 14 1 + &gpio1 13 1>; + gpio-fan,speed-map = <0 0 + 3000 1 + 6000 2>; + alarm-gpios = <&gpio1 15 1>; + }; diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c index 2f4b01b..f0a803b 100644 --- a/drivers/hwmon/gpio-fan.c +++ b/drivers/hwmon/gpio-fan.c @@ -31,6 +31,8 @@ #include #include #include +#include +#include struct gpio_fan_data { struct platform_device *pdev; @@ -400,14 +402,127 @@ static ssize_t show_name(struct device *dev, static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); + +#ifdef CONFIG_OF_GPIO +/* + * Translate OpenFirmware node properties into platform_data + */ +static int gpio_fan_get_of_pdata(struct device *dev, + struct gpio_fan_platform_data *pdata) +{ + struct device_node *node; + struct gpio_fan_speed *speed; + unsigned *ctrl; + unsigned i; + u32 u; + struct property *prop; + const __be32 *p; + + node = dev->of_node; + + /* Fill GPIO pin array */ + pdata->num_ctrl = of_gpio_count(node); + ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned), + GFP_KERNEL); + if (!ctrl) + return -ENOMEM; + for (i = 0; i < pdata->num_ctrl; i++) { + int val; + + val = of_get_gpio(node, i); + if (val < 0) + return val; + ctrl[i] = val; + } + pdata->ctrl = ctrl; + + /* Get number of RPM/ctrl_val pairs in speed map */ + prop = of_find_property(node, "gpio-fan,speed-map", &i); + if (!prop) { + dev_err(dev, "gpio-fan,speed-map node missing from DT"); + return -ENODEV; + } + i = i / sizeof(u32); + if (i == 0 || i & 1) { + dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries"); + return -ENODEV; + } + pdata->num_speed = i / 2; + + /* + * Populate speed map + * Speed map is in the form + * this needs splitting into pairs to create gpio_fan_speed structs + */ + speed = devm_kzalloc(dev, + pdata->num_speed * sizeof(struct gpio_fan_speed), + GFP_KERNEL); + if (!speed) + return -ENOMEM; + p = NULL; + for (i = 0; i < pdata->num_speed; i++) { + p = of_prop_next_u32(prop, p, &u); + if (!p) + return -ENODEV; + speed[i].rpm = u; + p = of_prop_next_u32(prop, p, &u); + if (!p) + return -ENODEV; + speed[i].ctrl_val = u; + } + pdata->speed = speed; + + /* Alarm GPIO if one exists */ + if (of_gpio_named_count(node, "alarm-gpios")) { + struct gpio_fan_alarm *alarm; + int val; + enum of_gpio_flags flags; + + alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm), + GFP_KERNEL); + if (!alarm) + return -ENOMEM; + + val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags); + if (val < 0) + return val; + alarm->gpio = val; + alarm->active_low = flags & OF_GPIO_ACTIVE_LOW; + + pdata->alarm = alarm; + } + + return 0; +} + +static struct of_device_id of_gpio_fan_match[] __devinitdata = { + { .compatible = "gpio-fan", }, + {}, +}; +#endif /* CONFIG_OF_GPIO */ + static int __devinit gpio_fan_probe(struct platform_device *pdev) { int err; struct gpio_fan_data *fan_data; struct gpio_fan_platform_data *pdata = pdev->dev.platform_data; +#ifdef CONFIG_OF_GPIO + if (!pdata) { + pdata = devm_kzalloc(&pdev->dev, + sizeof(struct gpio_fan_platform_data), + GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + err = gpio_fan_get_of_pdata(&pdev->dev, pdata); + if (err) + return err; + } +#else /* CONFIG_OF_GPIO */ if (!pdata) return -EINVAL; +#endif /* CONFIG_OF_GPIO */ fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data), GFP_KERNEL); @@ -511,6 +626,7 @@ static struct platform_driver gpio_fan_driver = { .driver = { .name = "gpio-fan", .pm = GPIO_FAN_PM, + .of_match_table = of_match_ptr(of_gpio_fan_match), }, };