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

["Pali Rohár" <pali.rohar@gmail.com>]

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On Friday 29 May 2015 18:57:06 Felipe Balbi wrote:
> All right, I tried merging it and it added build breaks to the tree.
> I'll wait for another version for v4.3 merge window.
> 
> cheers

Hello, version below compiles fine on top of linus tree. Please apply:

diff --git a/drivers/usb/gadget/legacy/Kconfig b/drivers/usb/gadget/legacy/Kconfig
index d5a7102..ddef41f 100644
--- a/drivers/usb/gadget/legacy/Kconfig
+++ b/drivers/usb/gadget/legacy/Kconfig
@@ -346,6 +346,7 @@ 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 4bb498a..021c8d9 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 nokia_bind_config(struct usb_configuration *c)
 {
@@ -125,6 +152,8 @@ static int 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 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 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 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 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 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);


-- 
Pali Rohár
pali.rohar@gmail.com

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