Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756305AbWKVSWn (ORCPT ); Wed, 22 Nov 2006 13:22:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756304AbWKVSWn (ORCPT ); Wed, 22 Nov 2006 13:22:43 -0500 Received: from mgw-ext12.nokia.com ([131.228.20.171]:30285 "EHLO mgw-ext12.nokia.com") by vger.kernel.org with ESMTP id S1756298AbWKVSWm (ORCPT ); Wed, 22 Nov 2006 13:22:42 -0500 Message-ID: <45646457.1060203@indt.org.br> Date: Wed, 22 Nov 2006 10:53:11 -0400 From: Anderson Briglia User-Agent: Icedove 1.5.0.7 (X11/20061013) MIME-Version: 1.0 To: "Linux-omap-open-source@linux.omap.com" CC: Russell King , Pierre Ossman , Tony Lindgren , "Aguiar Carlos (EXT-INdT/Manaus)" , ext David Brownell , "Lizardo Anderson (EXT-INdT/Manaus)" , linux-kernel@vger.kernel.org Subject: [patch 4/5] [RFC] Add MMC Password Protection (lock/unlock) support V7: mmc_sysfs.diff Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 22 Nov 2006 14:49:20.0021 (UTC) FILETIME=[64370C50:01C70E45] X-Nokia-AV: Clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4618 Lines: 141 Implement MMC password force erase, remove password, change password, unlock card and assign password operations. It uses the sysfs mechanism to send commands to the MMC subsystem. Signed-off-by: Carlos Eduardo Aguiar indt.org.br> Signed-off-by: Anderson Lizardo indt.org.br> Signed-off-by: Anderson Briglia indt.org.br> Index: linux-omap-2.6.git/drivers/mmc/mmc_sysfs.c =================================================================== --- linux-omap-2.6.git.orig/drivers/mmc/mmc_sysfs.c 2006-11-22 09:07:23.000000000 -0400 +++ linux-omap-2.6.git/drivers/mmc/mmc_sysfs.c 2006-11-22 09:18:58.000000000 -0400 @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -65,6 +66,94 @@ static struct device_attribute mmc_dev_a static struct device_attribute mmc_dev_attr_scr = MMC_ATTR_RO(scr); +#ifdef CONFIG_MMC_PASSWORDS + +static ssize_t +mmc_lockable_show(struct device *dev, struct device_attribute *att, char *buf) +{ + struct mmc_card *card = dev_to_mmc_card(dev); + + if (!mmc_card_lockable(card)) + return sprintf(buf, "unsupported\n"); + else + return sprintf(buf, "%slocked\n", mmc_card_locked(card) ? + "" : "un"); +} + +/* + * implement MMC password functions: force erase, remove password, change + * password, unlock card and assign password. + */ +static ssize_t +mmc_lockable_store(struct device *dev, struct device_attribute *att, + const char *data, size_t len) +{ + struct mmc_card *card = dev_to_mmc_card(dev); + + if (!mmc_card_lockable(card)) + return -EINVAL; + + if (mmc_card_locked(card) && !strncmp(data, "erase", 5)) { + /* forced erase only works while card is locked */ + mmc_lock_unlock(card, NULL, MMC_LOCK_MODE_ERASE); + return len; + } else if (!mmc_card_locked(card) && !strncmp(data, "remove", 6)) { + /* remove password only works while card is unlocked */ + struct key *mmc_key = request_key(&mmc_key_type, "mmc:key", "remove"); + + if (!IS_ERR(mmc_key)) { + int err = mmc_lock_unlock(card, mmc_key, MMC_LOCK_MODE_CLR_PWD); + if (!err) + return len; + } else + dev_dbg(&card->dev, "request_key returned error %ld\n", PTR_ERR(mmc_key)); + } else if (!mmc_card_locked(card) && !strncmp(data, "change", 6)) { + /* change */ + struct key *mmc_key = request_key(&mmc_key_type, "mmc:key", "change"); + + if (!IS_ERR(mmc_key)) { + int err = mmc_lock_unlock(card, mmc_key, MMC_LOCK_MODE_SET_PWD); + if (!err) + return len; + } else + dev_dbg(&card->dev, "request_key returned error %ld\n", PTR_ERR(mmc_key)); + } else if (mmc_card_locked(card) && !strncmp(data, "unlock", 6)) { + /* unlock */ + struct key *mmc_key = request_key(&mmc_key_type, "mmc:key", "unlock"); + + if (!IS_ERR(mmc_key)) { + int err = mmc_lock_unlock(card, mmc_key, MMC_LOCK_MODE_UNLOCK); + if (err) { + dev_dbg(&card->dev, "Wrong password\n"); + } + else { + device_release_driver(dev); + device_attach(dev); + return len; + } + } else + dev_dbg(&card->dev, "request_key returned error %ld\n", PTR_ERR(mmc_key)); + } else if (!mmc_card_locked(card) && !strncmp(data, "assign", 6)) { + /* assign */ + struct key *mmc_key = request_key(&mmc_key_type, "mmc:key", "assign"); + + if (!IS_ERR(mmc_key)) { + int err = mmc_lock_unlock(card, mmc_key, MMC_LOCK_MODE_SET_PWD); + if (!err) + return len; + } else + dev_dbg(&card->dev, "request_key returned error %ld\n", PTR_ERR(mmc_key)); + } + + return -EINVAL; +} + +static struct device_attribute mmc_dev_attr_lockable = + __ATTR(lockable, S_IWUSR | S_IRUGO, + mmc_lockable_show, mmc_lockable_store); + +#endif + static void mmc_release_card(struct device *dev) { @@ -234,6 +323,11 @@ int mmc_register_card(struct mmc_card *c if (ret) device_del(&card->dev); } +#ifdef CONFIG_MMC_PASSWORDS + ret = device_create_file(&card->dev, &mmc_dev_attr_lockable); + if (ret) + device_del(&card->dev); +#endif } return ret; } @@ -248,6 +342,9 @@ void mmc_remove_card(struct mmc_card *ca if (mmc_card_sd(card)) device_remove_file(&card->dev, &mmc_dev_attr_scr); +#ifdef CONFIG_MMC_PASSWORDS + device_remove_file(&card->dev, &mmc_dev_attr_lockable); +#endif device_del(&card->dev); } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/