From 6ac47090eef0c4358b04a974c4a5ac3d9bf44f79 Mon Sep 17 00:00:00 2001 From: Philipp Gesang Date: Mon, 1 Aug 2016 17:04:19 +0200 Subject: [PATCH] usb: gadget: Add per-lun inquiry string Introduce an attribute "inquiry_string" to the lun. In some environments, e. g. BIOS boot menus, the inquiry string is the only information about devices presented to the user. The default string depends on the "cdrom" bit of the first lun as well as the kernel version and allows no further customization. So without access to the client it is not obvious which gadget is active at a given point and what any of the available luns might contain. If "inquiry_string" is ignored or set to the empty string, the old behavior is preserved. Signed-off-by: Philipp Gesang Signed-off-by: Felipe Balbi --- drivers/usb/gadget/function/f_mass_storage.c | 28 +++++++++++++++----- drivers/usb/gadget/function/f_mass_storage.h | 1 + drivers/usb/gadget/function/storage_common.c | 24 +++++++++++++++++ drivers/usb/gadget/function/storage_common.h | 10 +++++++ 4 files changed, 57 insertions(+), 6 deletions(-) diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c index 2505117e88e8..8f3659b65f53 100644 --- a/drivers/usb/gadget/function/f_mass_storage.c +++ b/drivers/usb/gadget/function/f_mass_storage.c @@ -311,11 +311,7 @@ struct fsg_common { /* Gadget's private data. */ void *private_data; - /* - * Vendor (8 chars), product (16 chars), release (4 - * hexadecimal digits) and NUL byte - */ - char inquiry_string[8 + 16 + 4 + 1]; + char inquiry_string[INQUIRY_STRING_LEN]; struct kref ref; }; @@ -1107,7 +1103,12 @@ static int do_inquiry(struct fsg_common *common, struct fsg_buffhd *bh) buf[5] = 0; /* No special options */ buf[6] = 0; buf[7] = 0; - memcpy(buf + 8, common->inquiry_string, sizeof common->inquiry_string); + if (curlun->inquiry_string[0]) + memcpy(buf + 8, curlun->inquiry_string, + sizeof(curlun->inquiry_string)); + else + memcpy(buf + 8, common->inquiry_string, + sizeof(common->inquiry_string)); return 36; } @@ -3209,12 +3210,27 @@ static ssize_t fsg_lun_opts_nofua_store(struct config_item *item, CONFIGFS_ATTR(fsg_lun_opts_, nofua); +static ssize_t fsg_lun_opts_inquiry_string_show(struct config_item *item, + char *page) +{ + return fsg_show_inquiry_string(to_fsg_lun_opts(item)->lun, page); +} + +static ssize_t fsg_lun_opts_inquiry_string_store(struct config_item *item, + const char *page, size_t len) +{ + return fsg_store_inquiry_string(to_fsg_lun_opts(item)->lun, page, len); +} + +CONFIGFS_ATTR(fsg_lun_opts_, inquiry_string); + static struct configfs_attribute *fsg_lun_attrs[] = { &fsg_lun_opts_attr_file, &fsg_lun_opts_attr_ro, &fsg_lun_opts_attr_removable, &fsg_lun_opts_attr_cdrom, &fsg_lun_opts_attr_nofua, + &fsg_lun_opts_attr_inquiry_string, NULL, }; diff --git a/drivers/usb/gadget/function/f_mass_storage.h b/drivers/usb/gadget/function/f_mass_storage.h index b6a9918eaefb..d3902313b8ac 100644 --- a/drivers/usb/gadget/function/f_mass_storage.h +++ b/drivers/usb/gadget/function/f_mass_storage.h @@ -100,6 +100,7 @@ struct fsg_lun_config { char removable; char cdrom; char nofua; + char inquiry_string[INQUIRY_STRING_LEN]; }; struct fsg_config { diff --git a/drivers/usb/gadget/function/storage_common.c b/drivers/usb/gadget/function/storage_common.c index 990df221c629..8fbf6861690d 100644 --- a/drivers/usb/gadget/function/storage_common.c +++ b/drivers/usb/gadget/function/storage_common.c @@ -369,6 +369,12 @@ ssize_t fsg_show_removable(struct fsg_lun *curlun, char *buf) } EXPORT_SYMBOL_GPL(fsg_show_removable); +ssize_t fsg_show_inquiry_string(struct fsg_lun *curlun, char *buf) +{ + return sprintf(buf, "%s\n", curlun->inquiry_string); +} +EXPORT_SYMBOL_GPL(fsg_show_inquiry_string); + /* * The caller must hold fsg->filesem for reading when calling this function. */ @@ -499,4 +505,22 @@ ssize_t fsg_store_removable(struct fsg_lun *curlun, const char *buf, } EXPORT_SYMBOL_GPL(fsg_store_removable); +ssize_t fsg_store_inquiry_string(struct fsg_lun *curlun, const char *buf, + size_t count) +{ + const size_t len = min(count, sizeof(curlun->inquiry_string)); + + if (len == 0 || buf[0] == '\n') { + curlun->inquiry_string[0] = 0; + } else { + snprintf(curlun->inquiry_string, + sizeof(curlun->inquiry_string), "%-28s", buf); + if (curlun->inquiry_string[len-1] == '\n') + curlun->inquiry_string[len-1] = ' '; + } + + return count; +} +EXPORT_SYMBOL_GPL(fsg_store_inquiry_string); + MODULE_LICENSE("GPL"); diff --git a/drivers/usb/gadget/function/storage_common.h b/drivers/usb/gadget/function/storage_common.h index c3544e61da66..e69848994cb4 100644 --- a/drivers/usb/gadget/function/storage_common.h +++ b/drivers/usb/gadget/function/storage_common.h @@ -88,6 +88,12 @@ do { \ #define ASC(x) ((u8) ((x) >> 8)) #define ASCQ(x) ((u8) (x)) +/* + * Vendor (8 chars), product (16 chars), release (4 hexadecimal digits) and NUL + * byte + */ +#define INQUIRY_STRING_LEN ((size_t) (8 + 16 + 4 + 1)) + struct fsg_lun { struct file *filp; loff_t file_length; @@ -112,6 +118,7 @@ struct fsg_lun { struct device dev; const char *name; /* "lun.name" */ const char **name_pfx; /* "function.name" */ + char inquiry_string[INQUIRY_STRING_LEN]; }; static inline bool fsg_lun_is_open(struct fsg_lun *curlun) @@ -210,6 +217,7 @@ ssize_t fsg_show_ro(struct fsg_lun *curlun, char *buf); ssize_t fsg_show_nofua(struct fsg_lun *curlun, char *buf); ssize_t fsg_show_file(struct fsg_lun *curlun, struct rw_semaphore *filesem, char *buf); +ssize_t fsg_show_inquiry_string(struct fsg_lun *curlun, char *buf); ssize_t fsg_show_cdrom(struct fsg_lun *curlun, char *buf); ssize_t fsg_show_removable(struct fsg_lun *curlun, char *buf); ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem, @@ -221,5 +229,7 @@ ssize_t fsg_store_cdrom(struct fsg_lun *curlun, struct rw_semaphore *filesem, const char *buf, size_t count); ssize_t fsg_store_removable(struct fsg_lun *curlun, const char *buf, size_t count); +ssize_t fsg_store_inquiry_string(struct fsg_lun *curlun, const char *buf, + size_t count); #endif /* USB_STORAGE_COMMON_H */ -- 2.39.2