From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753946AbcDYIF1 (ORCPT ); Mon, 25 Apr 2016 04:05:27 -0400 Received: from mga03.intel.com ([134.134.136.65]:47117 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753663AbcDYIFX (ORCPT ); Mon, 25 Apr 2016 04:05:23 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,532,1455004800"; d="scan'208";a="791732243" From: Lu Baolu To: felipe.balbi@linux.intel.com, Mathias Nyman , Greg Kroah-Hartman , Lee Jones , Heikki Krogerus , MyungJoo Ham , Chanwoo Choi , Liam Girdwood , Mark Brown Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH v6 04/10] regulator: fixed: add support for ACPI interface Date: Mon, 25 Apr 2016 16:04:50 +0800 Message-Id: <1461571496-9600-5-git-send-email-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1461571496-9600-1-git-send-email-baolu.lu@linux.intel.com> References: <1461571496-9600-1-git-send-email-baolu.lu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support to retrieve fixed voltage configure information through ACPI interface. This is needed for Intel Bay Trail devices, where a GPIO is used to control the USB vbus. Signed-off-by: Lu Baolu --- drivers/regulator/fixed.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c index e6f376f..4d0cc84 100644 --- a/drivers/regulator/fixed.c +++ b/drivers/regulator/fixed.c @@ -30,6 +30,9 @@ #include #include #include +#include +#include +#include struct fixed_voltage_data { struct regulator_desc desc; @@ -104,6 +107,46 @@ of_get_fixed_voltage_config(struct device *dev, return config; } +/** + * acpi_get_fixed_voltage_config - extract fixed_voltage_config structure info + * @dev: device requesting for fixed_voltage_config + * @desc: regulator description + * + * Populates fixed_voltage_config structure by extracting data through ACPI + * interface, returns a pointer to the populated structure of NULL if memory + * alloc fails. + */ +static struct fixed_voltage_config * +acpi_get_fixed_voltage_config(struct device *dev, + const struct regulator_desc *desc) +{ + struct fixed_voltage_config *config; + const char *supply_name, *gpio_name; + struct gpio_desc *gpiod; + int ret; + + config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL); + if (!config) + return ERR_PTR(-ENOMEM); + + ret = device_property_read_string(dev, "supply-name", &supply_name); + if (!ret) + config->supply_name = supply_name; + + ret = device_property_read_string(dev, "gpio-name", &gpio_name); + if (!ret) { + gpiod = gpiod_get(dev, gpio_name, GPIOD_ASIS); + if (!IS_ERR(gpiod)) { + config->gpio = desc_to_gpio(gpiod); + config->enable_high = device_property_read_bool(dev, + "enable-active-high"); + gpiod_put(gpiod); + } + } + + return config; +} + static struct regulator_ops fixed_voltage_ops = { }; @@ -124,6 +167,11 @@ static int reg_fixed_voltage_probe(struct platform_device *pdev) &drvdata->desc); if (IS_ERR(config)) return PTR_ERR(config); + } else if (ACPI_HANDLE(&pdev->dev)) { + config = acpi_get_fixed_voltage_config(&pdev->dev, + &drvdata->desc); + if (IS_ERR(config)) + return PTR_ERR(config); } else { config = dev_get_platdata(&pdev->dev); } -- 2.1.4