Re: [PATCH] usb: gadget: nokia: Add mass storage driver to g_nokia

From: Pali RohÃr
Date: Thu May 28 2015 - 10:59:30 EST

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On Thursday 28 May 2015 16:51:07 Krzysztof Opasiak wrote:
>
>
> On 05/28/2015 04:31 PM, Pali RohÃr wrote:
> >On Thursday 28 May 2015 16:27:44 Krzysztof Opasiak wrote:
> >>
> >>
> >>On 05/28/2015 09:47 AM, Pali RohÃr wrote:
> >>>On Saturday 31 January 2015 10:53:30 Pali RohÃr wrote:
> >>>>This patch adds removable mass storage support to g_nokia gadget (for N900).
> >>>>It means that at runtime block device can be exported or unexported.
> >>>>So it does not export anything by default and thus allows to use MyDocs
> >>>>partition as before...
> >>>>
> >>>>Signed-off-by: Pali RohÃr <pali.rohar@xxxxxxxxx>
> >>>>---
> >>>> drivers/usb/gadget/legacy/Kconfig | 1 +
> >>>> drivers/usb/gadget/legacy/nokia.c | 102 ++++++++++++++++++++++++++++++++++++-
> >>>> 2 files changed, 102 insertions(+), 1 deletion(-)
> >>>>
> >>>>diff --git a/drivers/usb/gadget/legacy/Kconfig b/drivers/usb/gadget/legacy/Kconfig
> >>>>index fd48ef3..36f6ba4 100644
> >>>>--- a/drivers/usb/gadget/legacy/Kconfig
> >>>>+++ b/drivers/usb/gadget/legacy/Kconfig
> >>>>@@ -345,6 +345,7 @@ config USB_G_NOKIA
> >>>> select USB_F_OBEX
> >>>> select USB_F_PHONET
> >>>> select USB_F_ECM
> >>>>+ select USB_F_MASS_STORAGE
> >>>> help
> >>>> The Nokia composite gadget provides support for acm, obex
> >>>> and phonet in only one composite gadget driver.
> >>>>diff --git a/drivers/usb/gadget/legacy/nokia.c b/drivers/usb/gadget/legacy/nokia.c
> >>>>index 9b8fd70..a09bb50 100644
> >>>>--- a/drivers/usb/gadget/legacy/nokia.c
> >>>>+++ b/drivers/usb/gadget/legacy/nokia.c
> >>>>@@ -24,6 +24,7 @@
> >>>> #include "u_phonet.h"
> >>>> #include "u_ecm.h"
> >>>> #include "gadget_chips.h"
> >>>>+#include "f_mass_storage.h"
> >>>>
> >>>> /* Defines */
> >>>>
> >>>>@@ -34,6 +35,29 @@ USB_GADGET_COMPOSITE_OPTIONS();
> >>>>
> >>>> USB_ETHERNET_MODULE_PARAMETERS();
> >>>>
> >>>>+static struct fsg_module_parameters fsg_mod_data = {
> >>>>+ .stall = 0,
> >>>>+ .luns = 2,
> >>>>+ .removable_count = 2,
> >>>>+ .removable = { 1, 1, },
> >>>>+};
> >>>>+
> >>>>+FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
> >>>>+
> >>>>+#ifdef CONFIG_USB_GADGET_DEBUG_FILES
> >>>>+
> >>>>+static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;
> >>>>+
> >>>>+#else
> >>>>+
> >>>>+/*
> >>>>+ * Number of buffers we will use.
> >>>>+ * 2 is usually enough for good buffering pipeline
> >>>>+ */
> >>>>+#define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
> >>>>+
> >>>>+#endif /* CONFIG_USB_DEBUG */
> >>>>+
> >>>> #define NOKIA_VENDOR_ID 0x0421 /* Nokia */
> >>>> #define NOKIA_PRODUCT_ID 0x01c8 /* Nokia Gadget */
> >>>>
> >>>>@@ -94,6 +118,8 @@ static struct usb_function *f_obex1_cfg2;
> >>>> static struct usb_function *f_obex2_cfg2;
> >>>> static struct usb_function *f_phonet_cfg1;
> >>>> static struct usb_function *f_phonet_cfg2;
> >>>>+static struct usb_function *f_msg_cfg1;
> >>>>+static struct usb_function *f_msg_cfg2;
> >>>>
> >>>>
> >>>> static struct usb_configuration nokia_config_500ma_driver = {
> >>>>@@ -117,6 +143,7 @@ static struct usb_function_instance *fi_ecm;
> >>>> static struct usb_function_instance *fi_obex1;
> >>>> static struct usb_function_instance *fi_obex2;
> >>>> static struct usb_function_instance *fi_phonet;
> >>>>+static struct usb_function_instance *fi_msg;
> >>>>
> >>>> static int __init nokia_bind_config(struct usb_configuration *c)
> >>>> {
> >>>>@@ -125,6 +152,8 @@ static int __init nokia_bind_config(struct usb_configuration *c)
> >>>> struct usb_function *f_obex1 = NULL;
> >>>> struct usb_function *f_ecm;
> >>>> struct usb_function *f_obex2 = NULL;
> >>>>+ struct usb_function *f_msg;
> >>>>+ struct fsg_opts *fsg_opts;
> >>>> int status = 0;
> >>>> int obex1_stat = -1;
> >>>> int obex2_stat = -1;
> >>>>@@ -160,6 +189,12 @@ static int __init nokia_bind_config(struct usb_configuration *c)
> >>>> goto err_get_ecm;
> >>>> }
> >>>>
> >>>>+ f_msg = usb_get_function(fi_msg);
> >>>>+ if (IS_ERR(f_msg)) {
> >>>>+ status = PTR_ERR(f_msg);
> >>>>+ goto err_get_msg;
> >>>>+ }
> >>>>+
> >>>> if (!IS_ERR_OR_NULL(f_phonet)) {
> >>>> phonet_stat = usb_add_function(c, f_phonet);
> >>>> if (phonet_stat)
> >>>>@@ -187,21 +222,36 @@ static int __init nokia_bind_config(struct usb_configuration *c)
> >>>> pr_debug("could not bind ecm config %d\n", status);
> >>>> goto err_ecm;
> >>>> }
> >>>>+
> >>>>+ fsg_opts = fsg_opts_from_func_inst(fi_msg);
> >>>>+
> >>>>+ status = fsg_common_run_thread(fsg_opts->common);
> >>>>+ if (status)
> >>>>+ goto err_msg;
> >>>>+
> >>>>+ status = usb_add_function(c, f_msg);
> >>>>+ if (status)
> >>>>+ goto err_msg;
> >>>>+
> >>>> if (c == &nokia_config_500ma_driver) {
> >>>> f_acm_cfg1 = f_acm;
> >>>> f_ecm_cfg1 = f_ecm;
> >>>> f_phonet_cfg1 = f_phonet;
> >>>> f_obex1_cfg1 = f_obex1;
> >>>> f_obex2_cfg1 = f_obex2;
> >>>>+ f_msg_cfg1 = f_msg;
> >>>> } else {
> >>>> f_acm_cfg2 = f_acm;
> >>>> f_ecm_cfg2 = f_ecm;
> >>>> f_phonet_cfg2 = f_phonet;
> >>>> f_obex1_cfg2 = f_obex1;
> >>>> f_obex2_cfg2 = f_obex2;
> >>>>+ f_msg_cfg2 = f_msg;
> >>>> }
> >>>>
> >>>> return status;
> >>>>+err_msg:
> >>>>+ usb_remove_function(c, f_ecm);
> >>>> err_ecm:
> >>>> usb_remove_function(c, f_acm);
> >>>> err_conf:
> >>>>@@ -211,6 +261,8 @@ err_conf:
> >>>> usb_remove_function(c, f_obex1);
> >>>> if (!phonet_stat)
> >>>> usb_remove_function(c, f_phonet);
> >>>>+ usb_put_function(f_msg);
> >>>>+err_get_msg:
> >>>> usb_put_function(f_ecm);
> >>>> err_get_ecm:
> >>>> usb_put_function(f_acm);
> >>>>@@ -227,6 +279,8 @@ err_get_acm:
> >>>> static int __init nokia_bind(struct usb_composite_dev *cdev)
> >>>> {
> >>>> struct usb_gadget *gadget = cdev->gadget;
> >>>>+ struct fsg_opts *fsg_opts;
> >>>>+ struct fsg_config fsg_config;
> >>>> int status;
> >>>>
> >>>> status = usb_string_ids_tab(cdev, strings_dev);
> >>>>@@ -267,11 +321,46 @@ static int __init nokia_bind(struct usb_composite_dev *cdev)
> >>>> goto err_acm_inst;
> >>>> }
> >>>>
> >>>>+ fi_msg = usb_get_function_instance("mass_storage");
> >>>>+ if (IS_ERR(fi_msg)) {
> >>>>+ status = PTR_ERR(fi_msg);
> >>>>+ goto err_ecm_inst;
> >>>>+ }
> >>>>+
> >>>>+ /* set up mass storage function */
> >>>>+ fsg_config_from_params(&fsg_config, &fsg_mod_data, fsg_num_buffers);
> >>>>+ fsg_config.vendor_name = "Nokia";
> >>>>+ fsg_config.product_name = "N900";
> >>>>+
> >>>>+ fsg_opts = fsg_opts_from_func_inst(fi_msg);
> >>>>+ fsg_opts->no_configfs = true;
> >>>>+
> >>>>+ status = fsg_common_set_num_buffers(fsg_opts->common, fsg_num_buffers);
> >>>>+ if (status)
> >>>>+ goto err_msg_inst;
> >>>>+
> >>>>+ status = fsg_common_set_nluns(fsg_opts->common, fsg_config.nluns);
> >>>>+ if (status)
> >>>>+ goto err_msg_buf;
> >>>>+
> >>>>+ status = fsg_common_set_cdev(fsg_opts->common, cdev, fsg_config.can_stall);
> >>>>+ if (status)
> >>>>+ goto err_msg_set_nluns;
> >>>>+
> >>>>+ fsg_common_set_sysfs(fsg_opts->common, true);
> >>>>+
> >>>>+ status = fsg_common_create_luns(fsg_opts->common, &fsg_config);
> >>>>+ if (status)
> >>>>+ goto err_msg_set_nluns;
> >>>>+
> >>>>+ fsg_common_set_inquiry_string(fsg_opts->common, fsg_config.vendor_name,
> >>>>+ fsg_config.product_name);
> >>>>+
> >>>> /* finally register the configuration */
> >>>> status = usb_add_config(cdev, &nokia_config_500ma_driver,
> >>>> nokia_bind_config);
> >>>> if (status < 0)
> >>>>- goto err_ecm_inst;
> >>>>+ goto err_msg_set_cdev;
> >>>>
> >>>> status = usb_add_config(cdev, &nokia_config_100ma_driver,
> >>>> nokia_bind_config);
> >>>>@@ -292,6 +381,14 @@ err_put_cfg1:
> >>>> if (!IS_ERR_OR_NULL(f_phonet_cfg1))
> >>>> usb_put_function(f_phonet_cfg1);
> >>>> usb_put_function(f_ecm_cfg1);
> >>>>+err_msg_set_cdev:
> >>>>+ fsg_common_remove_luns(fsg_opts->common);
> >>>>+err_msg_set_nluns:
> >>>>+ fsg_common_free_luns(fsg_opts->common);
> >>>>+err_msg_buf:
> >>>>+ fsg_common_free_buffers(fsg_opts->common);
> >>>>+err_msg_inst:
> >>>>+ usb_put_function_instance(fi_msg);
> >>>> err_ecm_inst:
> >>>> usb_put_function_instance(fi_ecm);
> >>>> err_acm_inst:
> >>>>@@ -325,7 +422,10 @@ static int __exit nokia_unbind(struct usb_composite_dev *cdev)
> >>>> usb_put_function(f_acm_cfg2);
> >>>> usb_put_function(f_ecm_cfg1);
> >>>> usb_put_function(f_ecm_cfg2);
> >>>>+ usb_put_function(f_msg_cfg1);
> >>>>+ usb_put_function(f_msg_cfg2);
> >>>>
> >>>>+ usb_put_function_instance(fi_msg);
> >>>> usb_put_function_instance(fi_ecm);
> >>>> if (!IS_ERR(fi_obex2))
> >>>> usb_put_function_instance(fi_obex2);
> >>>
> >>>Opening discussion about this patch again as this is still only one
> >>>solution how to use use mass storage without breaking other stuff...
> >>>
> >>>Please understand finally that usb networking is very very important for
> >>>development on this device and usb mass storage is needed for
> >>>transferring bigger data.
> >>>
> >>>Also to clarify potential regressions: This patch adds *optional* usb
> >>>mass storage support and block device can be attached/detached to driver
> >>>at runtime. It does *not* enforce to export some (mmc) device
> >>>automatically. It is optional and userspace can decide...
> >>>
> >>>So MyDocs N900 partition is not automatically enforced to be exported
> >>>via usb (as some people thought) and so it does not break usb networking
> >>>or mass storage mode or MyDocs parition on N900 with Maemo system.
> >>>
> >>
> >>Instead of adding mass storage to legacy gadget you may switch to
> >>configfs interface and compose equivalent of g_nokia + mass storage
> >>without any changes in kernel.
> >>
> >>Best regards,
> >>
> >
> >That requires userspace. And there are developers who use nfsroot via
> >usb networking and so userspace will be there after properly
> >initializing usb gadget... So it is not easy and reason why I'm opening
> >this discussion again.
> >
>
> Couldn't you simply use initramfs to compose your gadget?
>

This is another next complication... I could spend time on hacking
serious problems on Nokia N900 (camera not working, bluetooth not
working, improving cellular audio/voice calls) or start playing with
initramfs and other kernel infrastructure just because usb is broken and
small fix which enable all needed usb functionality (usb networking, usb
TTY, usb phonet, usb mass storage) cannot be accepted and merged because
it really helps people to develop... :-( I see that it is under legacy
drivers, but without it is hard (and maybe not possible) to develop for
Nokia N900 device. Nobody until now proposed any other patch which fix
our problems and provide working usb functionality for mass storage,
network, TTY and phonet.

--
Pali RohÃr
pali.rohar@xxxxxxxxx
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Next message: Ingo Molnar: "Re: [PATCH 02/19] x86, fpu: Wrap get_xsave_addr() to make it safer"
Previous message: Jiri Kosina: "Re: [PATCH 1/1] usb: Remove Vernier devices from lsusb and hid_ignore_list"
In reply to: Krzysztof Opasiak: "Re: [PATCH] usb: gadget: nokia: Add mass storage driver to g_nokia"
Next in thread: Felipe Balbi: "Re: [PATCH] usb: gadget: nokia: Add mass storage driver to g_nokia"
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