From patchwork Wed Mar 22 19:57:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 9639925 X-Patchwork-Delegate: sameo@linux.intel.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 56F4C601E9 for ; Wed, 22 Mar 2017 19:58:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4F1792842C for ; Wed, 22 Mar 2017 19:58:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4332C2846F; Wed, 22 Mar 2017 19:58:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 283AA2842C for ; Wed, 22 Mar 2017 19:58:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751232AbdCVT6Q (ORCPT ); Wed, 22 Mar 2017 15:58:16 -0400 Received: from mga04.intel.com ([192.55.52.120]:34895 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750955AbdCVT6O (ORCPT ); Wed, 22 Mar 2017 15:58:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=intel; t=1490212693; x=1521748693; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=qRn4RDBZRmg4GfdZLWdFxlzqPVov/AJXTULeRUs8tg4=; b=kg+gUsEVGmP1DR2q2h+ZhcXMbOax5qaHSAjEKh+3X0pCrZs+MLAimaGJ nViFY+cCDBf5IjSYoDktxx+vkXyfzA==; Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Mar 2017 12:57:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.36,206,1486454400"; d="scan'208";a="947158326" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga003.jf.intel.com with ESMTP; 22 Mar 2017 12:57:54 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id EBD9294; Wed, 22 Mar 2017 21:57:52 +0200 (EET) From: Andy Shevchenko To: Lauro Ramos Venancio , Aloisio Almeida Jr , Samuel Ortiz , linux-wireless@vger.kernel.org, Mika Westerberg Cc: Andy Shevchenko Subject: [PATCH v2 2/5] NFC: pn544: Covert to use GPIO descriptor Date: Wed, 22 Mar 2017 21:57:49 +0200 Message-Id: <20170322195752.33291-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170322195752.33291-1-andriy.shevchenko@linux.intel.com> References: <20170322195752.33291-1-andriy.shevchenko@linux.intel.com> Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Since we got rid of platform data, the driver may use GPIO descriptor directly. This change fixes a potential issue of double freeing GPIOs in ACPI case by converting to devm_gpiod_get(). Signed-off-by: Andy Shevchenko --- drivers/nfc/pn544/i2c.c | 126 +++++++++++++----------------------------------- 1 file changed, 33 insertions(+), 93 deletions(-) diff --git a/drivers/nfc/pn544/i2c.c b/drivers/nfc/pn544/i2c.c index 41e518ee148e..b4001306aff8 100644 --- a/drivers/nfc/pn544/i2c.c +++ b/drivers/nfc/pn544/i2c.c @@ -21,9 +21,6 @@ #include #include #include -#include -#include -#include #include #include #include @@ -165,8 +162,9 @@ struct pn544_i2c_phy { struct i2c_client *i2c_dev; struct nfc_hci_dev *hdev; - unsigned int gpio_en; - unsigned int gpio_fw; + struct gpio_desc *gpiod_en; + struct gpio_desc *gpiod_fw; + unsigned int en_polarity; u8 hw_variant; @@ -208,19 +206,18 @@ static void pn544_hci_i2c_platform_init(struct pn544_i2c_phy *phy) nfc_info(&phy->i2c_dev->dev, "Detecting nfc_en polarity\n"); /* Disable fw download */ - gpio_set_value_cansleep(phy->gpio_fw, 0); + gpiod_set_value_cansleep(phy->gpiod_fw, 0); for (polarity = 0; polarity < 2; polarity++) { phy->en_polarity = polarity; retry = 3; while (retry--) { /* power off */ - gpio_set_value_cansleep(phy->gpio_en, - !phy->en_polarity); + gpiod_set_value_cansleep(phy->gpiod_en, !phy->en_polarity); usleep_range(10000, 15000); /* power on */ - gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity); + gpiod_set_value_cansleep(phy->gpiod_en, phy->en_polarity); usleep_range(10000, 15000); /* send reset */ @@ -239,14 +236,13 @@ static void pn544_hci_i2c_platform_init(struct pn544_i2c_phy *phy) "Could not detect nfc_en polarity, fallback to active high\n"); out: - gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity); + gpiod_set_value_cansleep(phy->gpiod_en, !phy->en_polarity); } static void pn544_hci_i2c_enable_mode(struct pn544_i2c_phy *phy, int run_mode) { - gpio_set_value_cansleep(phy->gpio_fw, - run_mode == PN544_FW_MODE ? 1 : 0); - gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity); + gpiod_set_value_cansleep(phy->gpiod_fw, run_mode == PN544_FW_MODE ? 1 : 0); + gpiod_set_value_cansleep(phy->gpiod_en, phy->en_polarity); usleep_range(10000, 15000); phy->run_mode = run_mode; @@ -269,14 +265,14 @@ static void pn544_hci_i2c_disable(void *phy_id) { struct pn544_i2c_phy *phy = phy_id; - gpio_set_value_cansleep(phy->gpio_fw, 0); - gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity); + gpiod_set_value_cansleep(phy->gpiod_fw, 0); + gpiod_set_value_cansleep(phy->gpiod_en, !phy->en_polarity); usleep_range(10000, 15000); - gpio_set_value_cansleep(phy->gpio_en, phy->en_polarity); + gpiod_set_value_cansleep(phy->gpiod_en, phy->en_polarity); usleep_range(10000, 15000); - gpio_set_value_cansleep(phy->gpio_en, !phy->en_polarity); + gpiod_set_value_cansleep(phy->gpiod_en, !phy->en_polarity); usleep_range(10000, 15000); phy->powered = 0; @@ -877,96 +873,47 @@ static void pn544_hci_i2c_fw_work(struct work_struct *work) static int pn544_hci_i2c_acpi_request_resources(struct i2c_client *client) { struct pn544_i2c_phy *phy = i2c_get_clientdata(client); - struct gpio_desc *gpiod_en, *gpiod_fw; struct device *dev = &client->dev; /* Get EN GPIO from ACPI */ - gpiod_en = devm_gpiod_get_index(dev, PN544_GPIO_NAME_EN, 1, - GPIOD_OUT_LOW); - if (IS_ERR(gpiod_en)) { + phy->gpiod_en = devm_gpiod_get_index(dev, PN544_GPIO_NAME_EN, 1, + GPIOD_OUT_LOW); + if (IS_ERR(phy->gpiod_en)) { nfc_err(dev, "Unable to get EN GPIO\n"); - return -ENODEV; + return PTR_ERR(phy->gpiod_en); } - phy->gpio_en = desc_to_gpio(gpiod_en); - /* Get FW GPIO from ACPI */ - gpiod_fw = devm_gpiod_get_index(dev, PN544_GPIO_NAME_FW, 2, - GPIOD_OUT_LOW); - if (IS_ERR(gpiod_fw)) { + phy->gpiod_fw = devm_gpiod_get_index(dev, PN544_GPIO_NAME_FW, 2, + GPIOD_OUT_LOW); + if (IS_ERR(phy->gpiod_fw)) { nfc_err(dev, "Unable to get FW GPIO\n"); - return -ENODEV; + return PTR_ERR(phy->gpiod_fw); } - phy->gpio_fw = desc_to_gpio(gpiod_fw); - return 0; } static int pn544_hci_i2c_of_request_resources(struct i2c_client *client) { struct pn544_i2c_phy *phy = i2c_get_clientdata(client); - struct device_node *pp; - int ret; - - pp = client->dev.of_node; - if (!pp) { - ret = -ENODEV; - goto err_dt; - } - - /* Obtention of EN GPIO from device tree */ - ret = of_get_named_gpio(pp, "enable-gpios", 0); - if (ret < 0) { - if (ret != -EPROBE_DEFER) - nfc_err(&client->dev, - "Failed to get EN gpio, error: %d\n", ret); - goto err_dt; - } - phy->gpio_en = ret; - - /* Configuration of EN GPIO */ - ret = gpio_request(phy->gpio_en, PN544_GPIO_NAME_EN); - if (ret) { - nfc_err(&client->dev, "Fail EN pin\n"); - goto err_dt; - } - ret = gpio_direction_output(phy->gpio_en, 0); - if (ret) { - nfc_err(&client->dev, "Fail EN pin direction\n"); - goto err_gpio_en; - } + struct device *dev = &client->dev; - /* Obtention of FW GPIO from device tree */ - ret = of_get_named_gpio(pp, "firmware-gpios", 0); - if (ret < 0) { - if (ret != -EPROBE_DEFER) - nfc_err(&client->dev, - "Failed to get FW gpio, error: %d\n", ret); - goto err_gpio_en; + /* Obtaining EN GPIO from device tree */ + phy->gpiod_en = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(phy->gpiod_en)) { + nfc_err(dev, "Failed to get EN gpio\n"); + return PTR_ERR(phy->gpiod_en); } - phy->gpio_fw = ret; - /* Configuration of FW GPIO */ - ret = gpio_request(phy->gpio_fw, PN544_GPIO_NAME_FW); - if (ret) { - nfc_err(&client->dev, "Fail FW pin\n"); - goto err_gpio_en; - } - ret = gpio_direction_output(phy->gpio_fw, 0); - if (ret) { - nfc_err(&client->dev, "Fail FW pin direction\n"); - goto err_gpio_fw; + /* Obtaining FW GPIO from device tree */ + phy->gpiod_fw = devm_gpiod_get(dev, "firmware", GPIOD_OUT_LOW); + if (IS_ERR(phy->gpiod_fw)) { + nfc_err(dev, "Failed to get FW gpio\n"); + return PTR_ERR(phy->gpiod_fw); } return 0; - -err_gpio_fw: - gpio_free(phy->gpio_fw); -err_gpio_en: - gpio_free(phy->gpio_en); -err_dt: - return ret; } static int pn544_hci_i2c_probe(struct i2c_client *client, @@ -1021,7 +968,7 @@ static int pn544_hci_i2c_probe(struct i2c_client *client, PN544_HCI_I2C_DRIVER_NAME, phy); if (r < 0) { nfc_err(&client->dev, "Unable to register IRQ handler\n"); - goto err_rti; + return r; } r = pn544_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME, @@ -1036,10 +983,6 @@ static int pn544_hci_i2c_probe(struct i2c_client *client, err_hci: free_irq(client->irq, phy); -err_rti: - gpio_free(phy->gpio_en); - gpio_free(phy->gpio_fw); - return r; } @@ -1060,9 +1003,6 @@ static int pn544_hci_i2c_remove(struct i2c_client *client) free_irq(client->irq, phy); - gpio_free(phy->gpio_en); - gpio_free(phy->gpio_fw); - return 0; }