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[23.128.96.18]) by mx.google.com with ESMTP id qp24si6901445ejb.526.2020.11.22.23.59.20; Sun, 22 Nov 2020 23:59:42 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@samsung.com header.s=mail20170921 header.b=UV3HtczW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=samsung.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728129AbgKWH5F (ORCPT + 99 others); Mon, 23 Nov 2020 02:57:05 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:58560 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726598AbgKWH5E (ORCPT ); Mon, 23 Nov 2020 02:57:04 -0500 Received: from epcas2p4.samsung.com (unknown [182.195.41.56]) by mailout3.samsung.com (KnoxPortal) with ESMTP id 20201123075702epoutp0325389a9d1bc29a2bf0c88949f47ad795~KFAORNRni0825608256epoutp035 for ; Mon, 23 Nov 2020 07:57:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout3.samsung.com 20201123075702epoutp0325389a9d1bc29a2bf0c88949f47ad795~KFAORNRni0825608256epoutp035 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1606118222; bh=h7j3pGKTr+iZaSuLe5ARKR58MH3db2jp2Hf76uc6KoY=; h=Subject:Reply-To:From:To:CC:Date:References:From; b=UV3HtczWGUixWaD4nGLUkC2wgxMh1BnxBe23uHW6g2/coEo2l/QvH3bL3dkaQvUQQ THVKVSn5KizD75SOG5P/ioxFATcwjH/0Qd+OvmX40MTzkedg5zJShDeEc6JzX2gdKb ZhO05IpUivfK7e3CE6rGoguRlgJVA+029cGbbNPc= Received: from epsnrtp2.localdomain (unknown [182.195.42.163]) by epcas2p4.samsung.com (KnoxPortal) with ESMTP id 20201123075702epcas2p477d559fb81fcb32a54f6d496588d20eb~KFAN3giLa0709607096epcas2p4r; Mon, 23 Nov 2020 07:57:02 +0000 (GMT) Received: from epsmges2p1.samsung.com (unknown [182.195.40.188]) by epsnrtp2.localdomain (Postfix) with ESMTP id 4Cffcr2GXlzMqYl8; Mon, 23 Nov 2020 07:57:00 +0000 (GMT) X-AuditID: b6c32a45-337ff7000001297d-1f-5fbb6b4af633 Received: from epcas2p1.samsung.com ( [182.195.41.53]) by epsmges2p1.samsung.com (Symantec Messaging Gateway) with SMTP id F0.36.10621.A4B6BBF5; Mon, 23 Nov 2020 16:56:58 +0900 (KST) Mime-Version: 1.0 Subject: [PATCH net-next 2/2] net: nfc: s3fwrn5: Support a UART interface Reply-To: bongsu.jeon@samsung.com Sender: Bongsu Jeon From: Bongsu Jeon To: "krzk@kernel.org" , "kuba@kernel.org" CC: "linux-kernel@vger.kernel.org" , "linux-nfc@lists.01.org" , "netdev@vger.kernel.org" X-Priority: 3 X-Content-Kind-Code: NORMAL X-CPGS-Detection: blocking_info_exchange X-Drm-Type: N,general X-Msg-Generator: Mail X-Msg-Type: PERSONAL X-Reply-Demand: N Message-ID: <20201123075658epcms2p5a6237314f7a72a2556545d3f96261c93@epcms2p5> Date: Mon, 23 Nov 2020 16:56:58 +0900 X-CMS-MailID: 20201123075658epcms2p5a6237314f7a72a2556545d3f96261c93 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrMKsWRmVeSWpSXmKPExsWy7bCmqa5X9u54g3WT+C3On9/AbnFhWx+r xeVdc9gs5mzYzG5xbIGYA6vHplWdbB7ds/+xeHzeJBfAHJVjk5GamJJapJCal5yfkpmXbqvk HRzvHG9qZmCoa2hpYa6kkJeYm2qr5OIToOuWmQO0UUmhLDGnFCgUkFhcrKRvZ1OUX1qSqpCR X1xiq5RakJJTYGhYoFecmFtcmpeul5yfa2VoYGBkClSZkJNxu2E+c8E8+4qvX74yNzBuNeli 5OSQEDCRmDx/LnsXIxeHkMAORoml7z4zdjFycPAKCEr83SEMYgoLeEqcPyUNUi4koCjxv+Mc G4gtLKAr8eLvUTCbTUBbYu3RRiYQW0TAR2LhjgVMICOZBVYzSkycs4oVYhevxIz2pywQtrTE 9uVbGSFsDYkfy3qZIWxRiZur37LD2O+PzYeqEZFovXcWqkZQ4sHP3VBxSYm3++aB3S8h0M4o cf7nDzYIZwajxKnNf6E69CUWn1sBdh6vgK/E2T1LwDawCKhKfF29iQmixkXi0/QTYNcxC8hL bH87hxnke2YBTYn1u/RBTAkBZYkjt6Aq+CQ6Dv9lh/lrx7wnUFNUJXqbvzDB/Dh5dgvUnR4S v1cuZ4EEYqDE1L4uxgmMCrMQIT0Lyd5ZCHsXMDKvYhRLLSjOTU8tNiowRI7cTYzg1KfluoNx 8tsPeocYmTgYDzFKcDArifC2yu2MF+JNSaysSi3Kjy8qzUktPsRoCvTxRGYp0eR8YPLNK4k3 NDUyMzOwNLUwNTOyUBLnDV3ZFy8kkJ5YkpqdmlqQWgTTx8TBKdXA1CKQ9p3n/fElLlk/Mv+Y iKc2XtnPEOWT9oCtZxpX11Mla/m9bX77ui4pLde5rVgzp18/74mtu8nWFxNaZ+y/pZ7Sv/DR r/RIka/qcctYrk3/L3b21exwkce/FqUcOBou38Ny3UM6+07Sh8+JOTzLyl9s3vj8wbrMtpeR d7TnHpGcptB65d3lCdZZe+9cF5tdr7lN54pSgs9BN7MrN46f/SZ+61D8naV7OIQWaD1uOWQX q7lg2+m1z5l2Tp67KvqR8UypuAs8K6RDri49rqnVZ7bTWNohznV6bfeLuws+rTz0pjoqcda0 5HnxjKbsc8qLalkY0pYwB/F9WP/M86mRTvYONrFSoXsv+u9KHbznqazEUpyRaKjFXFScCABV Yf00BgQAAA== DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20201123075658epcms2p5a6237314f7a72a2556545d3f96261c93 References: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since S3FWRN82 NFC Chip, The UART interface can be used. S3FWRN82 uses NCI protocol and supports I2C and UART interface. Signed-off-by: Bongsu Jeon --- drivers/nfc/s3fwrn5/Kconfig | 12 ++ drivers/nfc/s3fwrn5/Makefile | 2 + drivers/nfc/s3fwrn5/uart.c | 250 +++++++++++++++++++++++++++++++++++ 3 files changed, 264 insertions(+) create mode 100644 drivers/nfc/s3fwrn5/uart.c diff --git a/drivers/nfc/s3fwrn5/Kconfig b/drivers/nfc/s3fwrn5/Kconfig index 3f8b6da58280..6f88737769e1 100644 --- a/drivers/nfc/s3fwrn5/Kconfig +++ b/drivers/nfc/s3fwrn5/Kconfig @@ -20,3 +20,15 @@ config NFC_S3FWRN5_I2C To compile this driver as a module, choose m here. The module will be called s3fwrn5_i2c.ko. Say N if unsure. + +config NFC_S3FWRN82_UART + tristate "Samsung S3FWRN82 UART support" + depends on NFC_NCI && SERIAL_DEV_BUS + select NFC_S3FWRN5 + help + This module adds support for a UART interface to the S3FWRN82 chip. + Select this if your platform is using the UART bus. + + To compile this driver as a module, choose m here. The module will + be called s3fwrn82_uart.ko. + Say N if unsure. diff --git a/drivers/nfc/s3fwrn5/Makefile b/drivers/nfc/s3fwrn5/Makefile index d0ffa35f50e8..d1902102060b 100644 --- a/drivers/nfc/s3fwrn5/Makefile +++ b/drivers/nfc/s3fwrn5/Makefile @@ -5,6 +5,8 @@ s3fwrn5-objs = core.o firmware.o nci.o s3fwrn5_i2c-objs = i2c.o +s3fwrn82_uart-objs = uart.o obj-$(CONFIG_NFC_S3FWRN5) += s3fwrn5.o obj-$(CONFIG_NFC_S3FWRN5_I2C) += s3fwrn5_i2c.o +obj-$(CONFIG_NFC_S3FWRN82_UART) += s3fwrn82_uart.o diff --git a/drivers/nfc/s3fwrn5/uart.c b/drivers/nfc/s3fwrn5/uart.c new file mode 100644 index 000000000000..b3c36a5b28d3 --- /dev/null +++ b/drivers/nfc/s3fwrn5/uart.c @@ -0,0 +1,250 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * UART Link Layer for S3FWRN82 NCI based Driver + * + * Copyright (C) 2020 Samsung Electronics + * Author: Bongsu Jeon + * All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "s3fwrn5.h" + +#define S3FWRN82_UART_DRIVER_NAME "s3fwrn82_uart" +#define S3FWRN82_NCI_HEADER 3 +#define S3FWRN82_NCI_IDX 2 +#define S3FWRN82_EN_WAIT_TIME 20 +#define NCI_SKB_BUFF_LEN 258 + +struct s3fwrn82_uart_phy { + struct serdev_device *ser_dev; + struct nci_dev *ndev; + struct sk_buff *recv_skb; + + unsigned int gpio_en; + unsigned int gpio_fw_wake; + + /* mutex is used to synchronize */ + struct mutex mutex; + enum s3fwrn5_mode mode; +}; + +static void s3fwrn82_uart_set_wake(void *phy_id, bool wake) +{ + struct s3fwrn82_uart_phy *phy = phy_id; + + mutex_lock(&phy->mutex); + gpio_set_value(phy->gpio_fw_wake, wake); + msleep(S3FWRN82_EN_WAIT_TIME); + mutex_unlock(&phy->mutex); +} + +static void s3fwrn82_uart_set_mode(void *phy_id, enum s3fwrn5_mode mode) +{ + struct s3fwrn82_uart_phy *phy = phy_id; + + mutex_lock(&phy->mutex); + if (phy->mode == mode) + goto out; + phy->mode = mode; + gpio_set_value(phy->gpio_en, 1); + gpio_set_value(phy->gpio_fw_wake, 0); + if (mode == S3FWRN5_MODE_FW) + gpio_set_value(phy->gpio_fw_wake, 1); + if (mode != S3FWRN5_MODE_COLD) { + msleep(S3FWRN82_EN_WAIT_TIME); + gpio_set_value(phy->gpio_en, 0); + msleep(S3FWRN82_EN_WAIT_TIME); + } +out: + mutex_unlock(&phy->mutex); +} + +static enum s3fwrn5_mode s3fwrn82_uart_get_mode(void *phy_id) +{ + struct s3fwrn82_uart_phy *phy = phy_id; + enum s3fwrn5_mode mode; + + mutex_lock(&phy->mutex); + mode = phy->mode; + mutex_unlock(&phy->mutex); + return mode; +} + +static int s3fwrn82_uart_write(void *phy_id, struct sk_buff *out) +{ + struct s3fwrn82_uart_phy *phy = phy_id; + int err; + + err = serdev_device_write(phy->ser_dev, + out->data, out->len, + MAX_SCHEDULE_TIMEOUT); + if (err < 0) + return err; + + return 0; +} + +static const struct s3fwrn5_phy_ops uart_phy_ops = { + .set_wake = s3fwrn82_uart_set_wake, + .set_mode = s3fwrn82_uart_set_mode, + .get_mode = s3fwrn82_uart_get_mode, + .write = s3fwrn82_uart_write, +}; + +static int s3fwrn82_uart_read(struct serdev_device *serdev, + const unsigned char *data, + size_t count) +{ + struct s3fwrn82_uart_phy *phy = serdev_device_get_drvdata(serdev); + size_t i; + + for (i = 0; i < count; i++) { + skb_put_u8(phy->recv_skb, *data++); + + if (phy->recv_skb->len < S3FWRN82_NCI_HEADER) + continue; + + if ((phy->recv_skb->len - S3FWRN82_NCI_HEADER) + < phy->recv_skb->data[S3FWRN82_NCI_IDX]) + continue; + + s3fwrn5_recv_frame(phy->ndev, phy->recv_skb, phy->mode); + phy->recv_skb = alloc_skb(NCI_SKB_BUFF_LEN, GFP_KERNEL); + if (!phy->recv_skb) + return 0; + } + + return i; +} + +static struct serdev_device_ops s3fwrn82_serdev_ops = { + .receive_buf = s3fwrn82_uart_read, + .write_wakeup = serdev_device_write_wakeup, +}; + +static const struct of_device_id s3fwrn82_uart_of_match[] = { + { .compatible = "samsung,s3fwrn82-uart", }, + {}, +}; +MODULE_DEVICE_TABLE(of, s3fwrn82_uart_of_match); + +static int s3fwrn82_uart_parse_dt(struct serdev_device *serdev) +{ + struct s3fwrn82_uart_phy *phy = serdev_device_get_drvdata(serdev); + struct device_node *np = serdev->dev.of_node; + + if (!np) + return -ENODEV; + + phy->gpio_en = of_get_named_gpio(np, "en-gpios", 0); + if (!gpio_is_valid(phy->gpio_en)) + return -ENODEV; + + phy->gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0); + if (!gpio_is_valid(phy->gpio_fw_wake)) + return -ENODEV; + + return 0; +} + +static int s3fwrn82_uart_probe(struct serdev_device *serdev) +{ + struct s3fwrn82_uart_phy *phy; + int ret = -ENOMEM; + + phy = devm_kzalloc(&serdev->dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + goto err_exit; + + phy->recv_skb = alloc_skb(NCI_SKB_BUFF_LEN, GFP_KERNEL); + if (!phy->recv_skb) + goto err_free; + + mutex_init(&phy->mutex); + phy->mode = S3FWRN5_MODE_COLD; + + phy->ser_dev = serdev; + serdev_device_set_drvdata(serdev, phy); + serdev_device_set_client_ops(serdev, &s3fwrn82_serdev_ops); + ret = serdev_device_open(serdev); + if (ret) { + dev_err(&serdev->dev, "Unable to open device\n"); + goto err_skb; + } + + ret = serdev_device_set_baudrate(serdev, 115200); + if (ret != 115200) { + ret = -EINVAL; + goto err_serdev; + } + + serdev_device_set_flow_control(serdev, false); + + ret = s3fwrn82_uart_parse_dt(serdev); + if (ret < 0) + goto err_serdev; + + ret = devm_gpio_request_one(&phy->ser_dev->dev, + phy->gpio_en, + GPIOF_OUT_INIT_HIGH, + "s3fwrn82_en"); + if (ret < 0) + goto err_serdev; + + ret = devm_gpio_request_one(&phy->ser_dev->dev, + phy->gpio_fw_wake, + GPIOF_OUT_INIT_LOW, + "s3fwrn82_fw_wake"); + if (ret < 0) + goto err_serdev; + + ret = s3fwrn5_probe(&phy->ndev, phy, &phy->ser_dev->dev, &uart_phy_ops); + if (ret < 0) + goto err_serdev; + + return ret; + +err_serdev: + serdev_device_close(serdev); +err_skb: + kfree_skb(phy->recv_skb); +err_free: + kfree(phy); +err_exit: + return ret; +} + +static void s3fwrn82_uart_remove(struct serdev_device *serdev) +{ + struct s3fwrn82_uart_phy *phy = serdev_device_get_drvdata(serdev); + + s3fwrn5_remove(phy->ndev); + serdev_device_close(serdev); + kfree_skb(phy->recv_skb); + kfree(phy); +} + +static struct serdev_device_driver s3fwrn82_uart_driver = { + .probe = s3fwrn82_uart_probe, + .remove = s3fwrn82_uart_remove, + .driver = { + .name = S3FWRN82_UART_DRIVER_NAME, + .of_match_table = of_match_ptr(s3fwrn82_uart_of_match), + }, +}; + +module_serdev_device_driver(s3fwrn82_uart_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("UART driver for Samsung NFC"); +MODULE_AUTHOR("Bongsu Jeon "); -- 2.17.1