From patchwork Thu May 11 17:58:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Xiang X-Patchwork-Id: 681663 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31754C7EE2A for ; Thu, 11 May 2023 18:01:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239061AbjEKSB4 (ORCPT ); Thu, 11 May 2023 14:01:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238960AbjEKSBw (ORCPT ); Thu, 11 May 2023 14:01:52 -0400 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B799F4218; Thu, 11 May 2023 11:01:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1683828104; x=1715364104; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=dJJmS8cUJvOi/sZ1VchRmzwhvoPImOPRXfO0Qz+Mo6U=; b=eIVGyQjZT/QikFAuz9dJbtBk8p8TCjClhOpMQdK5CY0yyUdbnb8WZDaL gTebyQuwXrA09jMDSTwqj9TuGhORDmDcE7Fds5gSitexCO0IcZosyxHaI R+Ap/aMLzHTvkzkxtd5kzswpsh+QVTteoEgWksnGjfeFtvaK+x39SJDmb wg2eaU2OgAgNfdqSUUHjbYHH0SRURmeGeoPplqwks43qvjOSPRLW7mLVy F4mCe//do1lMSpLtw5cAFUmW4nqWx7E7O9/MWimZ1RRJBjG/sFa3ZaVto UseX1artRZSCeGQUjHPZTm4jiS1ArPb0xf+PAAVdeRjc/cmBGWKFxNyYk g==; X-IronPort-AV: E=McAfee;i="6600,9927,10707"; a="413942695" X-IronPort-AV: E=Sophos;i="5.99,268,1677571200"; d="scan'208";a="413942695" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2023 11:01:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10707"; a="874061484" X-IronPort-AV: E=Sophos;i="5.99,268,1677571200"; d="scan'208";a="874061484" Received: from ye-nuc7i7dnhe.sh.intel.com ([10.239.153.70]) by orsmga005.jf.intel.com with ESMTP; 11 May 2023 11:00:54 -0700 From: Ye Xiang To: Greg Kroah-Hartman , Arnd Bergmann , Matthias Kaehlcke , Lee Jones , Wolfram Sang , Tyrone Ting , Mark Brown , Linus Walleij , Marc Zyngier , Bartosz Golaszewski , linux-usb@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-gpio@vger.kernel.org Cc: srinivas.pandruvada@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, sakari.ailus@linux.intel.com, zhifeng.wang@intel.com, wentong.wu@intel.com, lixu.zhang@intel.com, Ye Xiang Subject: [PATCH v8 2/6] usb: ljca: Add transport interfaces for sub-module drivers Date: Fri, 12 May 2023 01:58:40 +0800 Message-Id: <20230511175844.185070-3-xiang.ye@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230511175844.185070-1-xiang.ye@intel.com> References: <20230511175844.185070-1-xiang.ye@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Adds the transport interfaces for various LJCA sub-module drivers to communicate with LJCA hardware. The sub-modules of LJCA can use ljca_transfer() to issue a transfer between host and hardware. And ljca_register_event_cb is exported to LJCA sub-module drivers for hardware event subscription. Signed-off-by: Ye Xiang --- drivers/usb/misc/usb-ljca.c | 91 +++++++++++++++++++++++++++++++++++++ include/linux/usb/ljca.h | 52 +++++++++++++++++++++ 2 files changed, 143 insertions(+) diff --git a/drivers/usb/misc/usb-ljca.c b/drivers/usb/misc/usb-ljca.c index 4f76f73fdcac..3b68c9e472fc 100644 --- a/drivers/usb/misc/usb-ljca.c +++ b/drivers/usb/misc/usb-ljca.c @@ -368,6 +368,97 @@ static int ljca_stub_write(struct ljca_stub *stub, u8 cmd, const void *obuf, uns return ret; } +static int ljca_transfer_internal(struct ljca *ljca, u8 cmd, const void *obuf, + unsigned int obuf_len, void *ibuf, unsigned int *ibuf_len, + bool wait_ack) +{ + struct ljca_stub *stub; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + return ljca_stub_write(stub, cmd, obuf, obuf_len, ibuf, ibuf_len, wait_ack, + LJCA_USB_WRITE_ACK_TIMEOUT_MS); +} + +int ljca_transfer(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len, void *ibuf, + unsigned int *ibuf_len) +{ + return ljca_transfer_internal(ljca, cmd, obuf, obuf_len, ibuf, ibuf_len, true); +} +EXPORT_SYMBOL_NS_GPL(ljca_transfer, LJCA); + +int ljca_transfer_noack(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len) +{ + return ljca_transfer_internal(ljca, cmd, obuf, obuf_len, NULL, NULL, false); +} +EXPORT_SYMBOL_NS_GPL(ljca_transfer_noack, LJCA); + +int ljca_register_event_cb(struct ljca *ljca, ljca_event_cb_t event_cb, void *context) +{ + struct ljca_event_cb_entry *entry, *iter; + struct ljca_stub *stub; + unsigned long flags; + int ret; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + return -ENOMEM; + + entry->notify = event_cb; + entry->context = context; + entry->id = ljca->id; + + spin_lock_irqsave(&stub->event_cb_lock, flags); + + list_for_each_entry(iter, &stub->event_entrys, list) { + if (iter->id == ljca->id) { + ret = -EBUSY; + break; + } + } + + if (!ret) + list_add_tail(&entry->list, &stub->event_entrys); + + spin_unlock_irqrestore(&stub->event_cb_lock, flags); + + if (ret) + kfree(entry); + + return ret; +} +EXPORT_SYMBOL_NS_GPL(ljca_register_event_cb, LJCA); + +void ljca_unregister_event_cb(struct ljca *ljca) +{ + struct ljca_stub *stub; + struct ljca_event_cb_entry *iter; + unsigned long flags; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return; + + spin_lock_irqsave(&stub->event_cb_lock, flags); + + list_for_each_entry(iter, &stub->event_entrys, list) { + if (iter->id == ljca->id) { + list_del_init(&iter->list); + kfree(iter); + break; + } + } + + spin_unlock_irqrestore(&stub->event_cb_lock, flags); +} +EXPORT_SYMBOL_NS_GPL(ljca_unregister_event_cb, LJCA); + static void ljca_read_complete(struct urb *urb) { struct ljca_msg *header = urb->transfer_buffer; diff --git a/include/linux/usb/ljca.h b/include/linux/usb/ljca.h index f209fa3ba54a..74e9729d05ec 100644 --- a/include/linux/usb/ljca.h +++ b/include/linux/usb/ljca.h @@ -47,4 +47,56 @@ struct ljca_spi_info { */ typedef void (*ljca_event_cb_t)(void *context, u8 cmd, const void *evt_data, int len); +/** + * ljca_register_event_cb - register a callback function to receive events + * + * @ljca: ljca device handle + * @event_cb: callback function + * @context: execution context of event callback + * + * Return: 0 in case of success, negative value in case of error + */ +int ljca_register_event_cb(struct ljca *ljca, ljca_event_cb_t event_cb, void *context); + +/** + * ljca_unregister_event_cb - unregister the callback function for an event + * + * @ljca: ljca device handle + */ +void ljca_unregister_event_cb(struct ljca *ljca); + +/** + * ljca_transfer - issue a LJCA command and wait for a response and the + * associated data + * + * @ljca: ljca device handle + * @cmd: the command to be sent to the device + * @obuf: the buffer to be sent to the device; it can be NULL if the user + * doesn't need to transmit data with this command + * @obuf_len: the size of the buffer to be sent to the device; it should + * be 0 when obuf is NULL + * @ibuf: any data associated with the response will be copied here; it can be + * NULL if the user doesn't need the response data + * @ibuf_len: must be initialized to the input buffer size; it will be modified + * to indicate the actual data transferred; it shouldn't be NULL as well + * when ibuf isn't NULL + * + * Return: 0 for success, negative value for errors + */ +int ljca_transfer(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len, + void *ibuf, unsigned int *ibuf_len); + +/** + * ljca_transfer_noack - issue a LJCA command without a response + * + * @ljca: ljca device handle + * @cmd: the command to be sent to the device + * @obuf: the buffer to be sent to the device; it can be NULL if the user + * doesn't need to transmit data with this command + * @obuf_len: the size of the buffer to be sent to the device + * + * Return: 0 for success, negative value for errors + */ +int ljca_transfer_noack(struct ljca *ljca, u8 cmd, const void *obuf, unsigned int obuf_len); + #endif