From patchwork Thu Mar 23 17:21:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Xiang X-Patchwork-Id: 666375 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 30F48C761AF for ; Thu, 23 Mar 2023 17:21:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231797AbjCWRVd (ORCPT ); Thu, 23 Mar 2023 13:21:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231756AbjCWRV3 (ORCPT ); Thu, 23 Mar 2023 13:21:29 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A088B2914B; Thu, 23 Mar 2023 10:21:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679592082; x=1711128082; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Pj85TQJLVLJmuPO/tAllo3uaWpcFLIm3bykN9olfZNU=; b=JnpxhSbkGW2QpZHDOahwO37dnDMtnRxvfdm5mwkzF6msMbYYDm6R6GYe dYQ7GkyOPXT91XpQFm8lW9gBtQlzTYktzYzNE8F86qDhl4IHglJGB8RcQ RbSLpedW9vEQ46UmAknR2XWYA0/F45VDkLQIe6e7KpJcT1qsrlNocIdca 1GGZgbxSH4TKNp0gybILpGV+U7s11mfNbIqkWr0ffFK+u3fdYZTtWHIOC W1U8LXdF3h7zCd4I8IaMuaWcQYPfWgSlWHbQ8PRP0WaK3TPtrPAb3So8Q CHH23hAlnMzZZoJ1raWRe/6ITJYjDWrg/oWzNwSltPJoCBMszpR0j1Z12 Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="425840228" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="425840228" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2023 10:21:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="712748291" X-IronPort-AV: E=Sophos;i="5.98,285,1673942400"; d="scan'208";a="712748291" Received: from ye-nuc7i7dnhe.sh.intel.com ([10.239.154.52]) by orsmga008.jf.intel.com with ESMTP; 23 Mar 2023 10:21:16 -0700 From: Ye Xiang To: Greg Kroah-Hartman , Arnd Bergmann , Matthias Kaehlcke , Lee Jones , Wolfram Sang , Tyrone Ting , Mark Brown , Linus Walleij , 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 v6 2/6] usb: ljca: Add transport interfaces for sub-module drivers Date: Fri, 24 Mar 2023 01:21:09 +0800 Message-Id: <20230323172113.1231050-3-xiang.ye@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230323172113.1231050-1-xiang.ye@intel.com> References: <20230323172113.1231050-1-xiang.ye@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch adds the transport interfaces for various LJCA sub-module drivers to communicate with LJCA hardware. The sub-module 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/ljca.c | 47 ++++++++++++++++++++++++++++ include/linux/usb/ljca.h | 66 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 113 insertions(+) diff --git a/drivers/usb/misc/ljca.c b/drivers/usb/misc/ljca.c index 3e4f85f453dd..7b874b82f1da 100644 --- a/drivers/usb/misc/ljca.c +++ b/drivers/usb/misc/ljca.c @@ -380,6 +380,53 @@ static int ljca_transfer_internal(struct ljca *ljca, u8 cmd, const void *obuf, 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_stub *stub; + unsigned long flags; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return PTR_ERR(stub); + + spin_lock_irqsave(&stub->event_cb_lock, flags); + stub->event_entry.notify = event_cb; + stub->event_entry.context = context; + spin_unlock_irqrestore(&stub->event_cb_lock, flags); + + return 0; +} +EXPORT_SYMBOL_NS_GPL(ljca_register_event_cb, LJCA); + +void ljca_unregister_event_cb(struct ljca *ljca) +{ + struct ljca_stub *stub; + unsigned long flags; + + stub = ljca_stub_find(ljca->dev, ljca->type); + if (IS_ERR(stub)) + return; + + spin_lock_irqsave(&stub->event_cb_lock, flags); + stub->event_entry.notify = NULL; + stub->event_entry.context = NULL; + 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 057f18c5b17a..9ae3ea242294 100644 --- a/include/linux/usb/ljca.h +++ b/include/linux/usb/ljca.h @@ -26,4 +26,70 @@ struct ljca_spi_info { u8 capacity; }; +/** + * typedef ljca_event_cb_t - event callback function signature + * + * @context: the execution context of who registered this callback + * @cmd: the command from device for this event + * @evt_data: the event data payload + * @len: the event data payload length + * + * The callback function is called in interrupt context and the data payload is + * only valid during the call. If the user needs later access of the data, it + * must copy it. + */ +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