From patchwork Wed Jun 10 06:15:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Macpaul Lin X-Patchwork-Id: 11597181 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A398C13B1 for ; Wed, 10 Jun 2020 06:15:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 84E242081A for ; Wed, 10 Jun 2020 06:15:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="jtdmFDFj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726119AbgFJGPd (ORCPT ); Wed, 10 Jun 2020 02:15:33 -0400 Received: from mailgw01.mediatek.com ([210.61.82.183]:14391 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725988AbgFJGPc (ORCPT ); Wed, 10 Jun 2020 02:15:32 -0400 X-UUID: 327b123795a04ebf8d9fdc0b9bb252f6-20200610 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=81Y2fVdBy50AQH7tnAGVr/bbzD+zlTSuDvNwyWyE3pk=; b=jtdmFDFjG+qvDMCWSc/8DriAaIKl4oqTGI/cGIZnqlaE8Cbayz3pWxNqoqLsw7Ir3KzE+kQuljCoaiPhMxzn4bLfMYXitK7Go/X1wTMWJ7v9yt6x216T2CNNDqrMttsE612bEajxaF6o08reMpbGoRK3v2VKU8yBb+XJLB1KLz0=; X-UUID: 327b123795a04ebf8d9fdc0b9bb252f6-20200610 Received: from mtkcas07.mediatek.inc [(172.21.101.84)] by mailgw01.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 903741230; Wed, 10 Jun 2020 14:15:25 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs01n1.mediatek.inc (172.21.101.68) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 10 Jun 2020 14:15:24 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 10 Jun 2020 14:15:23 +0800 From: Macpaul Lin To: Felipe Balbi , Greg Kroah-Hartman , Matthias Brugger , Alan Stern , Bart Van Assche , EJ Hsu , Mauro Carvalho Chehab , Benjamin Herrenschmidt , Peter Chen , , , , CC: Mediatek WSD Upstream , Macpaul Lin , Macpaul Lin , Justin Hsieh , Hakieyin Hsieh Subject: [PATCH v2] usb/gadget/function: introduce Built-in CDROM support Date: Wed, 10 Jun 2020 14:15:18 +0800 Message-ID: <1591769718-3287-1-git-send-email-macpaul.lin@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1591756349-17865-1-git-send-email-macpaul.lin@mediatek.com> References: <1591756349-17865-1-git-send-email-macpaul.lin@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Introduce Built-In CDROM (BICR) support. This feature depends on USB_CONFIGFS_MASS_STORAGE option. 1. Some settings and new function is introduced for BICR. 2. Some work around for adapting Android settings is introduced as well. Signed-off-by: Justin Hsieh Signed-off-by: Hakieyin Hsieh Signed-off-by: Macpaul Lin --- Changes for v2: - Thanks for Peter's review. - Fix typo in commit message. - use variable common->bicr instead of IS_ENABLED(). - Fix #ifdef CONFIG_USB_CONFIGFS_BICR. drivers/usb/gadget/Kconfig | 16 +++++++ drivers/usb/gadget/function/f_mass_storage.c | 49 +++++++++++++++++++- drivers/usb/gadget/function/f_mass_storage.h | 5 +- drivers/usb/gadget/function/storage_common.c | 23 +++++++++ 4 files changed, 90 insertions(+), 3 deletions(-) diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig index 4dc4d48fe6a6..686ba01bedb5 100644 --- a/drivers/usb/gadget/Kconfig +++ b/drivers/usb/gadget/Kconfig @@ -188,6 +188,9 @@ config USB_F_RNDIS config USB_F_MASS_STORAGE tristate +config USB_F_BICR + tristate + config USB_F_FS tristate @@ -357,6 +360,19 @@ config USB_CONFIGFS_MASS_STORAGE device (in much the same way as the "loop" device driver), specified as a module parameter or sysfs option. +config USB_CONFIGFS_BICR + bool "Built-In CDROM emulation" + depends on USB_CONFIGFS + depends on BLOCK + depends on USB_CONFIGFS_MASS_STORAGE + select USB_F_BICR + help + The Build-In CDROM Gadget acts as a CDROM emulation disk drive. + It is based on kernel option "USB_CONFIGFS_MASS_STORAGE". + As its storage repository it can use a regular file or a block + device (in much the same way as the "loop" device driver), + specified as a module parameter or sysfs option. + config USB_CONFIGFS_F_LB_SS bool "Loopback and sourcesink function (for testing)" depends on USB_CONFIGFS diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c index 33c2264a0e35..9de1cd465635 100644 --- a/drivers/usb/gadget/function/f_mass_storage.c +++ b/drivers/usb/gadget/function/f_mass_storage.c @@ -315,6 +315,9 @@ struct fsg_common { void *private_data; char inquiry_string[INQUIRY_STRING_LEN]; + + /* For build-in CDROM */ + u8 bicr; }; struct fsg_dev { @@ -369,6 +372,10 @@ static void set_bulk_out_req_length(struct fsg_common *common, if (rem > 0) length += common->bulk_out_maxpacket - rem; bh->outreq->length = length; + + /* some USB 2.0 hardware requires this setting */ + if (common->bicr) + bh->outreq->short_not_ok = 1; } @@ -527,7 +534,16 @@ static int fsg_setup(struct usb_function *f, w_length != 1) return -EDOM; VDBG(fsg, "get max LUN\n"); - *(u8 *)req->buf = _fsg_common_get_max_lun(fsg->common); + if (IS_ENABLED(USB_CONFIGFS_BICR) && fsg->common->bicr) { + /* + * When Built-In CDROM is enabled, + * we share only one LUN. + */ + *(u8 *)req->buf = 0; + } else { + *(u8 *)req->buf = _fsg_common_get_max_lun(fsg->common); + } + INFO(fsg, "get max LUN = %d\n", *(u8 *)req->buf); /* Respond with data/status */ req->length = min((u16)1, w_length); @@ -1329,7 +1345,7 @@ static int do_start_stop(struct fsg_common *common) } /* Are we allowed to unload the media? */ - if (curlun->prevent_medium_removal) { + if (!curlun->nofua && curlun->prevent_medium_removal) { LDBG(curlun, "unload attempt prevented\n"); curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED; return -EINVAL; @@ -2692,6 +2708,7 @@ int fsg_common_set_cdev(struct fsg_common *common, common->ep0 = cdev->gadget->ep0; common->ep0req = cdev->req; common->cdev = cdev; + common->bicr = 0; us = usb_gstrings_attach(cdev, fsg_strings_array, ARRAY_SIZE(fsg_strings)); @@ -2895,6 +2912,33 @@ static void fsg_common_release(struct fsg_common *common) kfree(common); } +#ifdef CONFIG_USB_CONFIGFS_BICR +ssize_t fsg_bicr_show(struct fsg_common *common, char *buf) +{ + return sprintf(buf, "%d\n", common->bicr); +} + +ssize_t fsg_bicr_store(struct fsg_common *common, const char *buf, size_t size) +{ + int ret; + + ret = kstrtou8(buf, 10, &common->bicr); + if (ret) + return -EINVAL; + + /* Set Lun[0] is a CDROM when enable bicr.*/ + if (!strcmp(buf, "1")) + common->luns[0]->cdrom = 1; + else { + common->luns[0]->cdrom = 0; + common->luns[0]->blkbits = 0; + common->luns[0]->blksize = 0; + common->luns[0]->num_sectors = 0; + } + + return size; +} +#endif /*-------------------------------------------------------------------------*/ @@ -3463,6 +3507,7 @@ void fsg_config_from_params(struct fsg_config *cfg, lun->ro = !!params->ro[i]; lun->cdrom = !!params->cdrom[i]; lun->removable = !!params->removable[i]; + lun->nofua = !!params->nofua[i]; lun->filename = params->file_count > i && params->file[i][0] ? params->file[i] diff --git a/drivers/usb/gadget/function/f_mass_storage.h b/drivers/usb/gadget/function/f_mass_storage.h index 3b8c4ce2a40a..7097e2ea5cc9 100644 --- a/drivers/usb/gadget/function/f_mass_storage.h +++ b/drivers/usb/gadget/function/f_mass_storage.h @@ -140,5 +140,8 @@ void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn, void fsg_config_from_params(struct fsg_config *cfg, const struct fsg_module_parameters *params, unsigned int fsg_num_buffers); - +#ifdef CONFIG_USB_CONFIGFS_BICR +ssize_t fsg_bicr_show(struct fsg_common *common, char *buf); +ssize_t fsg_bicr_store(struct fsg_common *common, const char *buf, size_t size); +#endif #endif /* USB_F_MASS_STORAGE_H */ diff --git a/drivers/usb/gadget/function/storage_common.c b/drivers/usb/gadget/function/storage_common.c index f7e6c42558eb..8fe96eeddf35 100644 --- a/drivers/usb/gadget/function/storage_common.c +++ b/drivers/usb/gadget/function/storage_common.c @@ -441,6 +441,29 @@ ssize_t fsg_store_file(struct fsg_lun *curlun, struct rw_semaphore *filesem, return -EBUSY; /* "Door is locked" */ } + pr_notice("%s file=%s, count=%d, curlun->cdrom=%d\n", + __func__, buf, (int)count, curlun->cdrom); + + /* + * WORKAROUND for Android: + * VOLD would clean the file path after switching to bicr. + * So when the lun is being a CD-ROM a.k.a. BICR. + * Don't clean the file path to empty. + */ + if (curlun->cdrom == 1 && count == 1) + return count; + + /* + * WORKAROUND: Should be closed the fsg lun for virtual cd-rom, + * when switch to other usb functions. + * Use the special keyword "off", because the init can + * not parse the char '\n' in rc file and write into the sysfs. + */ + if (count == 3 && + buf[0] == 'o' && buf[1] == 'f' && buf[2] == 'f' && + fsg_lun_is_open(curlun)) + ((char *) buf)[0] = 0; + /* Remove a trailing newline */ if (count > 0 && buf[count-1] == '\n') ((char *) buf)[count-1] = 0; /* Ugh! */