From patchwork Tue Jan 23 23:10:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 13528259 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8D3E5C47DDB for ; Tue, 23 Jan 2024 23:11:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=dEmvLFSaSUzlSQ6Oo924RC+aMW8WV0kbUjKnBUXtwsM=; b=hBB9BaHIIMaoD6 4s4kKhS5ldAs/ABBSujWsOE07NGtwfEYjkPaOd4OhPC4apMD+zoWxQry167u1EglOgBr8db470SWZ Z4TVoCpHE2A4op5GxHJdXO7fmIlhjMyY7KzXKduv5PMpWYLxdiu2C8KG4VjL+5Fa5INcR1TsAH/kP UECCJvknXxoszeYMWEqCgSqSe9GmQkbSGpRFkV0LNbRcvAkO0Bkvfwk/OuXZIma7K5v/Pks2Dh1xj XezJa6X4c/rkXlSPU5r4K6UiIL25kxPjXCh8SIcv5MmMG9PqIE3eMum0wm5O1DyMkSHwUOUfyDx4k JSKXtjdRdKGHBBMebHIg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rSPvb-000n0Z-0O; Tue, 23 Jan 2024 23:11:35 +0000 Received: from mail-am6eur05on20600.outbound.protection.outlook.com ([2a01:111:f403:2612::600] helo=EUR05-AM6-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rSPvW-000mxf-1Z for linux-i3c@lists.infradead.org; Tue, 23 Jan 2024 23:11:33 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=GvKQv3W+mKZc+LCG7Fa2D7OvbyFtzSmS39yqzaDJ7rCS/L6pAIVeYukVTsVrfSvBAT1sjczAcp0G4C5vVXd5b6dXnTqCacwyY7Mj+TpW6ZmS6aT+6c2V1hYkFUwCORp7HyTq9rmNHj5IyeXbSujJ4n6xmcVAxKyPhzJPOMtskI4dCC8J3i6DudCuSWRAn5swGtjBA7QY2UfP1if9Mw4htyxPosri9o6yRlkuaqxS/90+v204YxhutBcic24uYLUGG4VbfyzNvz9+DTcBeNfOUfi/2W3uh/f0sKZUrBPTjAQ8yL03u9V/BIltgP5z/DlIYnF2e2piMO4FpDMvdqQ0hg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=elXeixqm9OIPId/PL+W1dlakQnATLdA4uJRwdF4nyGo=; b=A+CCq8dC4C8I7n0jJL4adJcuJ+hs1rdjG1Xa/3HQXuFZJ8XT0o3aUzsHjz/VbSeP8C52nLy5GwTohXrszzVQwy6FrJL5wD0uuJZv6S6KciP9Hw5VOOGMHKNwq0mINLVXLPduWBqG/YWfScG2aJu8M2aDcKzet9mNkeXkCkvaM+o+agQk3LK3qq5Cd3KRfOFwAJsQ+36Whq0efUuwspE9ET6oL8YYMBuey6h7KAtdqes9MVGmZ4tz2SAN4DIdsRymVq7/Isdb5jhENHs+sbP9EjoJ5wZkgR8Zj2nSy5oyOilIC7/JDbN5eFe9AoTD2sFt6CNxyYO1/FZ85bN5oFic/A== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nxp.com; dmarc=pass action=none header.from=nxp.com; dkim=pass header.d=nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=elXeixqm9OIPId/PL+W1dlakQnATLdA4uJRwdF4nyGo=; b=kn54h7qBkgL/06hw7lX9QSbP6SFvf8FUUQr2G1ESCy3NXHDBKkVljpsTx8ZV1W6UyuYMLQ3REeg3LOLfounbcRwU+qBptwupjF1rz9UOYCD+9JQ3epqRODDFP42f7dcfmHbKLLl7+bC5itztxvyPhXygxw7SQu1FREqc/xAw8a8= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Received: from PAXPR04MB9642.eurprd04.prod.outlook.com (2603:10a6:102:240::14) by DB9PR04MB9475.eurprd04.prod.outlook.com (2603:10a6:10:367::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7202.32; Tue, 23 Jan 2024 23:11:24 +0000 Received: from PAXPR04MB9642.eurprd04.prod.outlook.com ([fe80::c8b4:5648:8948:e85c]) by PAXPR04MB9642.eurprd04.prod.outlook.com ([fe80::c8b4:5648:8948:e85c%3]) with mapi id 15.20.7202.035; Tue, 23 Jan 2024 23:11:24 +0000 From: Frank Li To: frank.li@nxp.com Cc: alexandre.belloni@bootlin.com, conor.culhane@silvaco.com, devicetree@vger.kernel.org, gregkh@linuxfoundation.org, imx@lists.linux.dev, jirislaby@kernel.org, joe@perches.com, krzysztof.kozlowski+dt@linaro.org, krzysztof.kozlowski@linaro.org, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, miquel.raynal@bootlin.com, robh@kernel.org, zbigniew.lukwinski@linux.intel.com Subject: [PATCH v4 6/8] i3c: target: func: add tty driver Date: Tue, 23 Jan 2024 18:10:41 -0500 Message-Id: <20240123231043.3891847-7-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240123231043.3891847-1-Frank.Li@nxp.com> References: <20240123231043.3891847-1-Frank.Li@nxp.com> X-ClientProxiedBy: SJ0PR03CA0371.namprd03.prod.outlook.com (2603:10b6:a03:3a1::16) To PAXPR04MB9642.eurprd04.prod.outlook.com (2603:10a6:102:240::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB9642:EE_|DB9PR04MB9475:EE_ X-MS-Office365-Filtering-Correlation-Id: 50a431b9-2f00-4374-1574-08dc1c689e5d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PAXPR04MB9642.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(136003)(376002)(396003)(346002)(366004)(39860400002)(230922051799003)(1800799012)(451199024)(64100799003)(186009)(1076003)(83380400001)(66946007)(2616005)(26005)(6506007)(6512007)(38100700002)(478600001)(2906002)(8676002)(30864003)(34206002)(8936002)(4326008)(7416002)(37006003)(52116002)(5660300002)(66476007)(6486002)(66556008)(316002)(6666004)(36756003)(38350700005)(86362001)(41300700001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 50a431b9-2f00-4374-1574-08dc1c689e5d X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB9642.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jan 2024 23:11:24.0241 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: q39h5xzwwj0kS/eYNt36FJHguFGyJqWejgn/DepoDRcX83yH34JQA7AOqD7aLI2Ic9RjcBe4LuWt+IQ9vaLdVg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR04MB9475 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240123_151130_682982_0B3070AF X-CRM114-Status: GOOD ( 19.77 ) X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org Add tty over I3C target function driver. Signed-off-by: Frank Li --- drivers/i3c/Kconfig | 3 + drivers/i3c/Makefile | 1 + drivers/i3c/func/Kconfig | 9 + drivers/i3c/func/Makefile | 3 + drivers/i3c/func/tty.c | 475 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 491 insertions(+) create mode 100644 drivers/i3c/func/Kconfig create mode 100644 drivers/i3c/func/Makefile create mode 100644 drivers/i3c/func/tty.c diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig index d59a7eb83d13a..fca808cda87b3 100644 --- a/drivers/i3c/Kconfig +++ b/drivers/i3c/Kconfig @@ -48,3 +48,6 @@ config I3C_TARGET_CONFIGFS the target function and used to bind the function with a target controller. +if I3C_TARGET +source "drivers/i3c/func/Kconfig" +endif # I3C_TARGET diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile index c275aeae8970c..11f026d6876fe 100644 --- a/drivers/i3c/Makefile +++ b/drivers/i3c/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_I3C) += i3c.o obj-$(CONFIG_I3C_TARGET) += target.o obj-$(CONFIG_I3C_TARGET_CONFIGFS) += i3c-cfs.o obj-$(CONFIG_I3C) += master/ +obj-$(CONFIG_I3C_TARGET) += func/ diff --git a/drivers/i3c/func/Kconfig b/drivers/i3c/func/Kconfig new file mode 100644 index 0000000000000..7115129eb7d5a --- /dev/null +++ b/drivers/i3c/func/Kconfig @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 + +config I3C_TARGET_FUNC_TTY + tristate "I3C target tty driver" + depends on I3C_TARGET + help + I3C Target TTY Function Driver. + + General TTY over I3C target controller function drivers. diff --git a/drivers/i3c/func/Makefile b/drivers/i3c/func/Makefile new file mode 100644 index 0000000000000..16b3b9301496b --- /dev/null +++ b/drivers/i3c/func/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_I3C_TARGET_FUNC_TTY) += tty.o diff --git a/drivers/i3c/func/tty.c b/drivers/i3c/func/tty.c new file mode 100644 index 0000000000000..bad99c08be0ac --- /dev/null +++ b/drivers/i3c/func/tty.c @@ -0,0 +1,475 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2023 NXP + * Author: Frank Li + */ + +#include +#include +#include +#include +#include + +static DEFINE_IDR(i3c_tty_minors); + +static struct tty_driver *i3c_tty_driver; + +#define I3C_TTY_MINORS 8 + +#define I3C_TX_NOEMPTY BIT(0) +#define I3C_TTY_TRANS_SIZE 16 +#define I3C_TTY_IBI_TX BIT(0) + +struct ttyi3c_port { + struct tty_port port; + int minor; + struct i3c_target_func *i3cdev; + struct completion txcomplete; + spinlock_t xlock; + void *buffer; + struct work_struct work; + u16 status; + struct i3c_request *req; +}; + +static void i3c_target_tty_rx_complete(struct i3c_request *req) +{ + struct ttyi3c_port *port = req->context; + + if (req->status == I3C_REQUEST_CANCEL) { + i3c_target_ctrl_free_request(req); + return; + } + + tty_insert_flip_string(&port->port, req->buf, req->actual); + tty_flip_buffer_push(&port->port); + + req->actual = 0; + req->status = 0; + i3c_target_ctrl_queue(req, GFP_KERNEL); +} + +static void i3c_target_tty_tx_complete(struct i3c_request *req) +{ + struct ttyi3c_port *sport = req->context; + unsigned long flags; + + if (req->status == I3C_REQUEST_CANCEL) { + i3c_target_ctrl_free_request(req); + return; + } + + spin_lock_irqsave(&sport->xlock, flags); + kfifo_dma_out_finish(&sport->port.xmit_fifo, req->actual); + sport->req = NULL; + + if (kfifo_is_empty(&sport->port.xmit_fifo)) + complete(&sport->txcomplete); + else + queue_work(system_unbound_wq, &sport->work); + + if (kfifo_len(&sport->port.xmit_fifo) < WAKEUP_CHARS) + tty_port_tty_wakeup(&sport->port); + spin_unlock_irqrestore(&sport->xlock, flags); + + i3c_target_ctrl_free_request(req); +} + +static void i3c_target_tty_i3c_work(struct work_struct *work) +{ + struct ttyi3c_port *sport = container_of(work, struct ttyi3c_port, work); + struct i3c_request *req = sport->req; + struct scatterlist sg[1]; + unsigned int nents; + u8 ibi; + + if (kfifo_is_empty(&sport->port.xmit_fifo)) + return; + + if (!req) { + req = i3c_target_ctrl_alloc_request(sport->i3cdev->ctrl, GFP_KERNEL); + if (!req) + return; + + sg_init_table(sg, ARRAY_SIZE(sg)); + nents = kfifo_dma_out_prepare(&sport->port.xmit_fifo, sg, ARRAY_SIZE(sg), + UART_XMIT_SIZE); + if (!nents) + goto err; + + req->length = sg->length; + req->buf = sg_virt(sg); + + req->complete = i3c_target_tty_tx_complete; + req->context = sport; + req->tx = true; + + if (i3c_target_ctrl_queue(req, GFP_KERNEL)) + goto err; + + sport->req = req; + } + + ibi = I3C_TTY_IBI_TX; + i3c_target_ctrl_raise_ibi(sport->i3cdev->ctrl, &ibi, 1); + + return; + +err: + i3c_target_ctrl_free_request(req); +} + +static int i3c_port_activate(struct tty_port *port, struct tty_struct *tty) +{ + struct ttyi3c_port *sport = container_of(port, struct ttyi3c_port, port); + const struct i3c_target_ctrl_features *feature; + struct i3c_target_func *func = sport->i3cdev; + struct i3c_request *req; + int rxfifo_size; + int offset = 0; + int ret; + + feature = i3c_target_ctrl_get_features(func->ctrl); + if (!feature) + return -EINVAL; + + ret = tty_port_alloc_xmit_buf(port); + if (ret) + return ret; + + sport->buffer = (void *)get_zeroed_page(GFP_KERNEL); + if (!sport->buffer) + goto err_alloc_rx_buf; + + rxfifo_size = feature->rx_fifo_sz; + + if (!rxfifo_size) + rxfifo_size = I3C_TTY_TRANS_SIZE; + + do { + req = i3c_target_ctrl_alloc_request(func->ctrl, GFP_KERNEL); + if (!req) + goto err_alloc_req; + + req->buf = (void *) (sport->buffer + offset); + req->length = rxfifo_size; + req->context = sport; + req->complete = i3c_target_tty_rx_complete; + offset += rxfifo_size; + + if (i3c_target_ctrl_queue(req, GFP_KERNEL)) + goto err_alloc_req; + } while (req && (offset + rxfifo_size) < UART_XMIT_SIZE); + + reinit_completion(&sport->txcomplete); + + return 0; + +err_alloc_req: + i3c_target_ctrl_cancel_all_reqs(func->ctrl, false); + free_page((unsigned long)sport->buffer); +err_alloc_rx_buf: + tty_port_free_xmit_buf(port); + return -ENOMEM; +} + +static void i3c_port_shutdown(struct tty_port *port) +{ + struct ttyi3c_port *sport = + container_of(port, struct ttyi3c_port, port); + + cancel_work_sync(&sport->work); + + i3c_target_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, true); + i3c_target_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, false); + + i3c_target_ctrl_fifo_flush(sport->i3cdev->ctrl, true); + i3c_target_ctrl_fifo_flush(sport->i3cdev->ctrl, false); + + tty_port_free_xmit_buf(port); + free_page((unsigned long)sport->buffer); +} + +static void i3c_port_destruct(struct tty_port *port) +{ + struct ttyi3c_port *sport = + container_of(port, struct ttyi3c_port, port); + + idr_remove(&i3c_tty_minors, sport->minor); +} + +static const struct tty_port_operations i3c_port_ops = { + .shutdown = i3c_port_shutdown, + .activate = i3c_port_activate, + .destruct = i3c_port_destruct, +}; + +static int i3c_target_tty_bind(struct i3c_target_func *func) +{ + struct ttyi3c_port *sport; + struct device *tty_dev; + int minor; + int ret; + + sport = dev_get_drvdata(&func->dev); + + if (i3c_target_ctrl_set_config(func->ctrl, func)) { + dev_err(&func->dev, "failure set i3c config\n"); + return -EINVAL; + } + + spin_lock_init(&sport->xlock); + init_completion(&sport->txcomplete); + + ret = minor = idr_alloc(&i3c_tty_minors, sport, 0, I3C_TTY_MINORS, GFP_KERNEL); + + if (minor < 0) + goto err_idr_alloc; + + tty_port_init(&sport->port); + sport->port.ops = &i3c_port_ops; + + tty_dev = tty_port_register_device(&sport->port, i3c_tty_driver, minor, + &func->dev); + if (IS_ERR(tty_dev)) { + ret = PTR_ERR(tty_dev); + goto err_register_port; + } + + sport->minor = minor; + ret = i3c_target_ctrl_enable(func->ctrl); + if (ret) + goto err_ctrl_enable; + + return 0; + +err_ctrl_enable: + tty_port_unregister_device(&sport->port, i3c_tty_driver, sport->minor); +err_register_port: + idr_remove(&i3c_tty_minors, sport->minor); +err_idr_alloc: + i3c_target_ctrl_cancel_all_reqs(func->ctrl, false); + dev_err(&func->dev, "bind failure\n"); + + return ret; +} + +static void i3c_target_tty_unbind(struct i3c_target_func *func) +{ + struct ttyi3c_port *sport; + + sport = dev_get_drvdata(&func->dev); + + cancel_work_sync(&sport->work); + + i3c_target_ctrl_disable(func->ctrl); + i3c_target_ctrl_cancel_all_reqs(func->ctrl, 0); + i3c_target_ctrl_cancel_all_reqs(func->ctrl, 1); + + tty_port_unregister_device(&sport->port, i3c_tty_driver, sport->minor); + + free_page((unsigned long)sport->buffer); +} + +static struct i3c_target_func_ops i3c_func_ops = { + .bind = i3c_target_tty_bind, + .unbind = i3c_target_tty_unbind, +}; + +static int i3c_tty_probe(struct i3c_target_func *func) +{ + struct device *dev = &func->dev; + struct ttyi3c_port *port; + + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + port->i3cdev = func; + dev_set_drvdata(&func->dev, port); + + INIT_WORK(&port->work, i3c_target_tty_i3c_work); + + return 0; +} + +static ssize_t i3c_write(struct tty_struct *tty, const unsigned char *buf, size_t count) +{ + struct ttyi3c_port *sport = tty->driver_data; + unsigned long flags; + bool is_empty; + int ret = 0; + + spin_lock_irqsave(&sport->xlock, flags); + ret = kfifo_in(&sport->port.xmit_fifo, buf, count); + is_empty = kfifo_is_empty(&sport->port.xmit_fifo); + i3c_target_ctrl_set_status_format1(sport->i3cdev->ctrl, sport->status | I3C_TX_NOEMPTY); + spin_unlock_irqrestore(&sport->xlock, flags); + + if (!is_empty) + queue_work(system_unbound_wq, &sport->work); + + return ret; +} + +static int i3c_put_char(struct tty_struct *tty, unsigned char ch) +{ + struct ttyi3c_port *sport = tty->driver_data; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&sport->xlock, flags); + ret = kfifo_put(&sport->port.xmit_fifo, ch); + spin_unlock_irqrestore(&sport->xlock, flags); + + return ret; +} + +static void i3c_flush_chars(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + unsigned long flags; + + spin_lock_irqsave(&sport->xlock, flags); + if (!kfifo_is_empty(&sport->port.xmit_fifo)) + queue_work(system_unbound_wq, &sport->work); + spin_unlock_irqrestore(&sport->xlock, flags); +} + +static unsigned int i3c_write_room(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + + return kfifo_avail(&sport->port.xmit_fifo); +} + +static void i3c_throttle(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + + i3c_target_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, false); +} + +static void i3c_unthrottle(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + + i3c_port_activate(&sport->port, tty); +} + +static int i3c_open(struct tty_struct *tty, struct file *filp) +{ + struct ttyi3c_port *sport = container_of(tty->port, struct ttyi3c_port, port); + int ret; + + tty->driver_data = sport; + + if (!i3c_target_ctrl_get_addr(sport->i3cdev->ctrl)) { + dev_dbg(&sport->i3cdev->dev, "No target addr assigned, try hotjoin"); + ret = i3c_target_ctrl_hotjoin(sport->i3cdev->ctrl); + if (ret) { + dev_err(&sport->i3cdev->dev, "Hotjoin failure, check connection"); + return ret; + } + } + + return tty_port_open(&sport->port, tty, filp); +} + +static void i3c_close(struct tty_struct *tty, struct file *filp) +{ + tty_port_close(tty->port, tty, filp); +} + +static void i3c_wait_until_sent(struct tty_struct *tty, int timeout) +{ + struct ttyi3c_port *sport = tty->driver_data; + int val; + int ret; + u8 ibi = I3C_TTY_IBI_TX; + int retry = 100; + + if (!kfifo_is_empty(&sport->port.xmit_fifo)) { + do { + ret = wait_for_completion_timeout(&sport->txcomplete, timeout / 100); + if (ret) + break; + i3c_target_ctrl_raise_ibi(sport->i3cdev->ctrl, &ibi, 1); + } while (retry--); + + reinit_completion(&sport->txcomplete); + } + + read_poll_timeout(i3c_target_ctrl_fifo_status, val, !val, 100, timeout, false, + sport->i3cdev->ctrl, true); + + i3c_target_ctrl_set_status_format1(sport->i3cdev->ctrl, sport->status & (~I3C_TX_NOEMPTY)); +} + +static const struct tty_operations i3c_tty_ops = { + .open = i3c_open, + .close = i3c_close, + .write = i3c_write, + .put_char = i3c_put_char, + .flush_chars = i3c_flush_chars, + .write_room = i3c_write_room, + .throttle = i3c_throttle, + .unthrottle = i3c_unthrottle, + .wait_until_sent = i3c_wait_until_sent, +}; + +DECLARE_I3C_TARGET_FUNC(tty, i3c_tty_probe, NULL, &i3c_func_ops); + +static int __init i3c_tty_init(void) +{ + int ret; + + i3c_tty_driver = tty_alloc_driver( + I3C_TTY_MINORS, TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV); + + if (IS_ERR(i3c_tty_driver)) + return PTR_ERR(i3c_tty_driver); + + i3c_tty_driver->driver_name = "ttySI3C", i3c_tty_driver->name = "ttySI3C", + i3c_tty_driver->minor_start = 0, + i3c_tty_driver->type = TTY_DRIVER_TYPE_SERIAL, + i3c_tty_driver->subtype = SERIAL_TYPE_NORMAL, + i3c_tty_driver->init_termios = tty_std_termios; + i3c_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | + CLOCAL; + i3c_tty_driver->init_termios.c_lflag = 0; + + tty_set_operations(i3c_tty_driver, &i3c_tty_ops); + + ret = tty_register_driver(i3c_tty_driver); + if (ret) + goto err_register_tty_driver; + + ret = i3c_target_func_register_driver(&ttyi3c_func); + if (ret) + goto err_register_i3c_driver; + + return 0; + +err_register_i3c_driver: + tty_unregister_driver(i3c_tty_driver); + +err_register_tty_driver: + tty_driver_kref_put(i3c_tty_driver); + + return ret; +} + +static void __exit i3c_tty_exit(void) +{ + i3c_target_func_unregister_driver(&ttyi3c_func); + tty_unregister_driver(i3c_tty_driver); + tty_driver_kref_put(i3c_tty_driver); + idr_destroy(&i3c_tty_minors); +} + +module_init(i3c_tty_init); +module_exit(i3c_tty_exit); + +MODULE_LICENSE("GPL"); +