--- /dev/null
+/*
+ * libdevice-node
+ *
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the License);
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <hw/usb_client.h>
+#include <hw/systemd.h>
+#include <hw/shared.h>
+
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+#include <usbg/usbg.h>
+#include <unistd.h>
+
+#include <unistd.h>
+
+#define zalloc(amount) calloc(1, amount)
+
+#define MAX_GADGET_STR_LEN 256
+#define MAX_FUNCS 32
+
+#define CONFIGFS_PATH "/sys/kernel/config"
+
+#define CONFIGFS_GADGET_NAME "hal-gadget"
+#define CONFIGFS_CONFIG_LABEL "hal-config"
+
+#define NAME_INSTANCE_SEP '.'
+#define MAX_INSTANCE_LEN 512
+
+#define USB_FUNCS_PATH "/dev/usb-funcs/"
+
+#ifndef EXPORT
+#define EXPORT __attribute__ ((visibility("default")))
+#endif
+
+struct cfs_client {
+ struct usb_client client;
+ usbg_state *ctx;
+ usbg_gadget *gadget;
+ usbg_udc *udc;
+};
+
+/* Based on values in slp-gadget kernel module */
+struct usbg_gadget_attrs default_g_attrs = {
+ .bcdUSB = 0x0200,
+ .idVendor = 0x04e8,
+ .idProduct = 0x6860,
+ .bcdDevice = 0x0100,
+};
+
+struct usbg_gadget_strs default_g_strs = {
+ .manufacturer = "Samsung",
+ .product = "TIZEN",
+ .serial = "01234TEST",
+};
+
+static void cfs_free_config(struct usb_configuration *config)
+{
+ int i;
+
+ if (!config)
+ return;
+
+ if (config->strs) {
+ for (i = 0; config->strs[i].lang_code; ++i)
+ free(config->strs[i].config_str);
+
+ free(config->strs);
+ }
+
+ /*
+ * Each function will be free later,
+ * for now we cleanup only pointers.
+ */
+ if (config->funcs)
+ free(config->funcs);
+
+ free(config);
+}
+
+static void cfs_free_gadget(struct usb_gadget *gadget)
+{
+ int i;
+
+ if (!gadget)
+ return;
+
+ if (gadget->strs) {
+ for (i = 0; gadget->strs[i].lang_code; ++i) {
+ free(gadget->strs[i].manufacturer);
+ free(gadget->strs[i].product);
+ free(gadget->strs[i].serial);
+ }
+ free(gadget->strs);
+ }
+
+ if (gadget->configs) {
+ for (i = 0; gadget->configs[i]; ++i)
+ cfs_free_config(gadget->configs[i]);
+
+ free(gadget->configs);
+ }
+
+ if (gadget->funcs) {
+ for (i = 0; gadget->funcs[i]; ++i)
+ gadget->funcs[i]->free_func(gadget->funcs[i]);
+
+ free(gadget->funcs);
+ }
+}
+
+static int cfs_read_gadget_attrs_strs(usbg_gadget *gadget,
+ struct usb_gadget *usb_gadget)
+{
+ struct usbg_gadget_attrs attrs;
+ struct usbg_gadget_strs strs;
+ int ret;
+
+ ret = usbg_get_gadget_attrs(gadget, &attrs);
+ if (ret)
+ goto out;
+
+ usb_gadget->attrs.bDeviceClass = attrs.bDeviceClass;
+ usb_gadget->attrs.bDeviceSubClass = attrs.bDeviceSubClass;
+ usb_gadget->attrs.bDeviceProtocol = attrs.bDeviceProtocol;
+ usb_gadget->attrs.idVendor = attrs.idVendor;
+ usb_gadget->attrs.idProduct = attrs.idProduct;
+ usb_gadget->attrs.bcdDevice = attrs.bcdDevice;
+
+
+ ret = usbg_get_gadget_strs(gadget, LANG_US_ENG, &strs);
+ if (ret)
+ goto out;
+
+ usb_gadget->strs[0].manufacturer = strdup(strs.manufacturer);
+ usb_gadget->strs[0].product = strdup(strs.product);
+ usb_gadget->strs[0].serial = strdup(strs.serial);
+
+ if (!usb_gadget->strs[0].manufacturer ||
+ !usb_gadget->strs[0].product ||
+ !usb_gadget->strs[0].serial) {
+ ret = -ENOMEM;
+ goto err_strs;
+ }
+
+ return 0;
+err_strs:
+ free(usb_gadget->strs[0].manufacturer);
+ free(usb_gadget->strs[0].product);
+ free(usb_gadget->strs[0].serial);
+out:
+ return ret;
+}
+
+static bool cfs_match_func(struct usb_function *f,
+ const char *name, const char *instance) {
+ if (strcmp(name, usbg_get_function_type_str(USBG_F_FFS))) {
+ /* Standard functions */
+ if (!strcmp(name, f->name) && !strcmp(instance, f->instance))
+ return true;
+ } else {
+ /* Function with service */
+ const char *sep, *fname, *finst;
+ int len;
+
+ sep = strchr(instance, NAME_INSTANCE_SEP);
+ if (!sep || strlen(sep + 1) < 1)
+ return false;
+
+ fname = instance;
+ len = sep - instance;
+ finst = sep + 1;
+
+ if (strlen(f->name) == len
+ && !strncmp(f->name, fname, len)
+ && !strcmp(f->instance, finst))
+ return true;
+ }
+
+ return false;
+}
+
+
+static int cfs_find_func(const char *name, const char *instance)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(_available_funcs); ++i)
+ if (cfs_match_func(_available_funcs[i], name, instance))
+ return i;
+
+ return -ENOENT;
+}
+
+static int cfs_alloc_new_func(struct usb_gadget *gadget, const char *fname,
+ const char *instance, struct usb_function **_func)
+{
+ struct usb_function *func;
+ int ret;
+
+ ret = cfs_find_func(fname, instance);
+ if (ret < 0)
+ return -ENOTSUP;
+
+ ret = _available_funcs[ret]->clone(_available_funcs[ret], &func);
+ if (ret)
+ return ret;
+
+ *_func = func;
+ return 0;
+}
+
+static int cfs_read_funcs(usbg_gadget *gadget, struct usb_gadget *usb_gadget)
+{
+ usbg_function *func;
+ int i;
+ int ret;
+
+ i = 0;
+ usbg_for_each_function(func, gadget) {
+ char *func_name = (char *)usbg_get_function_type_str(
+ usbg_get_function_type(func));
+ char *instance = (char *)usbg_get_function_instance(func);
+
+ ret = cfs_alloc_new_func(usb_gadget, func_name, instance,
+ usb_gadget->funcs + i);
+ if (ret < 0)
+ goto clean_prev;
+ ++i;
+ }
+
+ return 0;
+clean_prev:
+ while (i >= 0) {
+ usb_gadget->funcs[i]->free_func(usb_gadget->funcs[i]);
+ --i;
+ }
+
+ return ret;
+}
+
+static struct usb_function *cfs_find_func_in_gadget(
+ struct usb_gadget *gadget, const char *name, const char *instance)
+{
+ int i;
+
+ for (i = 0; gadget->funcs[i]; ++i)
+ if (cfs_match_func(gadget->funcs[i], name, instance))
+ return gadget->funcs[i];
+
+ return NULL;
+}
+
+static int cfs_alloc_config(int n_funcs, struct usb_configuration **_config)
+{
+ struct usb_configuration *config;
+
+ config = zalloc(sizeof(*config));
+ if (!config)
+ goto out;
+
+ config->strs = calloc(2, sizeof(*config->strs));
+ if (!config->strs)
+ goto free_config;
+
+ config->funcs = calloc(n_funcs + 1, sizeof(*config->funcs));
+ if (!config->funcs)
+ goto free_strs;
+
+ *_config = config;
+
+ return 0;
+free_strs:
+ free(config->strs);
+free_config:
+ free(config);
+out:
+ return -ENOMEM;
+}
+
+static int cfs_read_config(usbg_config *config, struct usb_gadget *gadget,
+ struct usb_configuration *usb_config)
+{
+ usbg_binding *b;
+ usbg_function *func;
+ char *name, *instance;
+ struct usbg_config_attrs c_attrs;
+ struct usbg_config_strs c_strs;
+ int i = 0;
+ int ret;
+
+ usbg_for_each_binding(b, config) {
+ func = usbg_get_binding_target(b);
+
+ name = (char *)usbg_get_function_type_str(
+ usbg_get_function_type(func));
+ instance = (char *)usbg_get_function_instance(func);
+
+ usb_config->funcs[i] = cfs_find_func_in_gadget(gadget,
+ name, instance);
+ if (!usb_config->funcs[i]) {
+ return -ENOTSUP;
+ }
+ ++i;
+ }
+
+ ret = usbg_get_config_attrs(config, &c_attrs);
+ if (ret)
+ return ret;
+
+ usb_config->attrs.MaxPower = c_attrs.bMaxPower*2;
+ usb_config->attrs.bmAttributs = c_attrs.bmAttributes;
+
+ ret = usbg_get_config_strs(config, LANG_US_ENG, &c_strs);
+ if (ret) {
+ usb_config->strs[0].lang_code = 0;
+ } else {
+ usb_config->strs[0].lang_code = LANG_US_ENG;
+ usb_config->strs[0].config_str = strdup(c_strs.configuration);
+ if (!usb_config->strs[0].config_str)
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int cfs_count_bindings(usbg_config *config)
+{
+ usbg_binding *b;
+ int i = 0;
+
+ usbg_for_each_binding(b, config) ++i;
+
+ return i;
+}
+
+static int cfs_read_configs(usbg_gadget *gadget, struct usb_gadget *usb_gadget)
+{
+ usbg_config *config;
+ int i = 0;
+ int n_funcs;
+ int ret;
+
+ usbg_for_each_config(config, gadget) {
+ n_funcs = cfs_count_bindings(config);
+
+ ret = cfs_alloc_config(n_funcs, usb_gadget->configs + i);
+ if (ret)
+ goto clean_prev;
+ ret = cfs_read_config(config, usb_gadget,
+ usb_gadget->configs[i]);
+ if (ret)
+ goto free_current;
+
+ ++i;
+ }
+
+ return 0;
+free_current:
+ free(usb_gadget->configs[i]->strs);
+ free(usb_gadget->configs[i]->funcs);
+ free(usb_gadget->configs[i]);
+clean_prev:
+ while (i >= 0)
+ cfs_free_config(usb_gadget->configs[i--]);
+ return ret;
+}
+
+static int cfs_count_configs(usbg_gadget *gadget)
+{
+ usbg_config *config;
+ int i = 0;
+
+ usbg_for_each_config(config, gadget) ++i;
+
+ return i;
+}
+
+static int cfs_count_functions(usbg_gadget *gadget)
+{
+ usbg_function *func;
+ int i = 0;
+
+ usbg_for_each_function(func, gadget) ++i;
+
+ return i;
+}
+
+static int cfs_get_current_gadget(struct usb_client *usb,
+ struct usb_gadget **_usb_gadget)
+{
+ struct cfs_client *cfs_client;
+ struct usb_gadget *usb_gadget;
+ struct usb_gadget_strings *strs;
+ struct usb_configuration **usb_configs;
+ struct usb_function **usb_funcs;
+ int n_funcs, n_configs;
+ int i;
+ int ret = -ENOMEM;
+
+ if (!usb)
+ return -EINVAL;
+
+ cfs_client = container_of(usb, struct cfs_client,
+ client);
+
+ usb_gadget = zalloc(sizeof(*usb_gadget));
+ if (!usb_gadget)
+ goto out;
+
+ /*
+ * Currently there is no interface in libusbg which
+ * allows to list all string languages.
+ * That's why we do this only for USA english
+ */
+ strs = calloc(2, sizeof(*strs));
+ if (!strs)
+ goto free_gadget;
+
+ strs[0].lang_code = LANG_US_ENG;
+
+ usb_gadget->strs = strs;
+
+ ret = cfs_read_gadget_attrs_strs(cfs_client->gadget, usb_gadget);
+ if (ret)
+ goto free_strs;
+
+
+ n_funcs = cfs_count_functions(cfs_client->gadget);
+ usb_funcs = calloc(n_funcs + 1, sizeof(*usb_funcs));
+ if (!usb_funcs)
+ goto free_strs_with_content;
+
+ usb_gadget->funcs = usb_funcs;
+
+ ret = cfs_read_funcs(cfs_client->gadget, usb_gadget);
+ if (ret)
+ goto free_funcs;
+
+ n_configs = cfs_count_configs(cfs_client->gadget);
+ usb_configs = calloc(n_configs + 1, sizeof(*usb_configs));
+ if (!usb_configs)
+ goto free_funcs_with_content;
+
+ usb_gadget->configs = usb_configs;
+
+ ret = cfs_read_configs(cfs_client->gadget, usb_gadget);
+ if (ret)
+ goto free_configs;
+
+ *_usb_gadget = usb_gadget;
+ return 0;
+
+free_configs:
+ free(usb_configs);
+free_funcs_with_content:
+ for (i = 0; usb_gadget->funcs[i]; ++i)
+ usb_gadget->funcs[i]->free_func(usb_gadget->funcs[i]);
+free_funcs:
+ free(usb_funcs);
+free_strs_with_content:
+ for (i = 0; usb_gadget->strs[i].lang_code; ++i) {
+ free(usb_gadget->strs[i].manufacturer);
+ free(usb_gadget->strs[i].product);
+ free(usb_gadget->strs[i].serial);
+ }
+free_strs:
+ free(usb_gadget->strs);
+free_gadget:
+ free(usb_gadget);
+out:
+ return ret;
+}
+
+static bool cfs_is_function_supported(struct usb_client *usb,
+ struct usb_function *func)
+{
+ bool res;
+ int ret;
+
+ switch (func->function_group) {
+ case USB_FUNCTION_GROUP_SIMPLE:
+ ret = usbg_lookup_function_type(func->name);
+ res = ret >= 0;
+ break;
+ case USB_FUNCTION_GROUP_WITH_SERVICE:
+ /* TODO: Check if socket is available */
+ res = true;
+ break;
+ default:
+ res = false;
+ }
+
+ return res;
+}
+
+static bool cfs_is_gadget_supported(struct usb_client *usb,
+ struct usb_gadget *gadget)
+{
+ int i, j;
+
+ if (!gadget || !gadget->configs || !gadget->funcs)
+ return false;
+
+ /*
+ * TODO
+ * Here is a good place to ensure that serial is immutable
+ */
+
+ /* No real restrictions for strings */
+ for (j = 0; gadget->configs && gadget->configs[j]; ++j) {
+ struct usb_configuration *config = gadget->configs[j];
+
+ if (!config->funcs)
+ return false;
+
+ for (i = 0; config->funcs[i]; ++i)
+ if (!cfs_is_function_supported(usb, config->funcs[i]))
+ return false;
+ }
+
+ if (j == 0)
+ return false;
+
+ return true;
+}
+
+static int cfs_set_gadget_attrs(struct cfs_client *cfs_client,
+ struct usb_gadget_attrs *attrs)
+{
+ int ret;
+ struct usbg_gadget_attrs gadget_attrs;
+
+ ret = usbg_get_gadget_attrs(cfs_client->gadget, &gadget_attrs);
+ if (ret)
+ return ret;
+
+ gadget_attrs.bDeviceClass = attrs->bDeviceClass;
+ gadget_attrs.bDeviceSubClass = attrs->bDeviceSubClass;
+ gadget_attrs.bDeviceProtocol = attrs->bDeviceProtocol;
+ gadget_attrs.idVendor = attrs->idVendor;
+ gadget_attrs.idProduct = attrs->idProduct;
+ gadget_attrs.bcdDevice = attrs->bcdDevice;
+
+ ret = usbg_set_gadget_attrs(cfs_client->gadget, &gadget_attrs);
+
+ return ret;
+}
+
+static int cfs_set_gadget_strs(struct cfs_client *cfs_client,
+ struct usb_gadget_strings *strs)
+{
+ int ret = 0;
+
+ /*
+ * TODO
+ * Here is a good place to ensure that serial is immutable
+ */
+#define SET_STR(FIELD, STR_ID) \
+ if (strs->FIELD) { \
+ ret = usbg_set_gadget_str(cfs_client->gadget, \
+ STR_ID, \
+ strs->lang_code, \
+ strs->FIELD); \
+ if (ret) \
+ return ret; \
+ }
+
+ SET_STR(manufacturer, USBG_STR_MANUFACTURER);
+ SET_STR(product, USBG_STR_PRODUCT);
+ SET_STR(serial, USBG_STR_SERIAL_NUMBER);
+#undef SET_STR
+ return ret;
+}
+
+static int cfs_ensure_dir(char *path)
+{
+ int ret;
+
+ ret = mkdir(path, 0770);
+ if (ret < 0)
+ ret = errno == EEXIST ? 0 : errno;
+
+ return ret;
+}
+
+static int cfs_prep_ffs_service(const char *name, const char *instance,
+ const char *dev_name, const char *socket_name)
+{
+ char buf[PATH_MAX];
+ size_t left;
+ char *pos;
+ int ret;
+
+ /* TODO: Add some good error handling */
+
+ left = sizeof(buf);
+ pos = buf;
+ ret = snprintf(pos, left, "%s", USB_FUNCS_PATH);
+ if (ret < 0 || ret >= left) {
+ return -ENAMETOOLONG;
+ } else {
+ left -= ret;
+ pos += ret;
+ }
+ ret = cfs_ensure_dir(buf);
+ if (ret < 0)
+ return ret;
+
+ ret = snprintf(pos, left, "/%s", name);
+ if (ret < 0 || ret >= left) {
+ return -ENAMETOOLONG;
+ } else {
+ left -= ret;
+ pos += ret;
+ }
+ ret = cfs_ensure_dir(buf);
+ if (ret < 0)
+ return ret;
+
+ ret = snprintf(pos, left, "/%s", instance);
+ if (ret < 0 || ret >= left) {
+ return -ENAMETOOLONG;
+ } else {
+ left -= ret;
+ pos += ret;
+ }
+ ret = cfs_ensure_dir(buf);
+ if (ret < 0)
+ return ret;
+
+ ret = mount(dev_name, buf, "functionfs", 0, NULL);
+ if (ret < 0)
+ return ret;
+
+ ret = systemd_start_socket(socket_name);
+ if (ret < 0)
+ goto umount_ffs;
+
+ return 0;
+umount_ffs:
+ umount(buf);
+ return ret;
+}
+
+static int cfs_set_gadget_config(struct cfs_client *cfs_client,
+ int config_id,
+ struct usb_configuration *usb_config)
+{
+ struct usbg_config_attrs cattrs = {
+ .bmAttributes = usb_config->attrs.bmAttributs,
+ .bMaxPower = usb_config->attrs.MaxPower/2,
+ };
+ usbg_config *config;
+ int i;
+ int ret;
+
+ if (!usb_config->funcs || !usb_config->funcs[0])
+ return -EINVAL;
+
+ config = usbg_get_config(cfs_client->gadget, config_id, NULL);
+ if (config) {
+ ret = usbg_rm_config(config, USBG_RM_RECURSE);
+ if (ret)
+ return ret;
+ }
+
+ ret = usbg_create_config(cfs_client->gadget, config_id,
+ CONFIGFS_CONFIG_LABEL, &cattrs, NULL, &config);
+ if (ret)
+ return ret;
+
+ for (i = 0; usb_config->strs && usb_config->strs[i].lang_code; ++i) {
+ ret = usbg_set_config_string(config, usb_config->strs[i].lang_code,
+ usb_config->strs[i].config_str);
+ if (ret)
+ return ret;
+ }
+
+ for (i = 0; usb_config->funcs && usb_config->funcs[i]; ++i) {
+ struct usb_function *usb_func = usb_config->funcs[i];
+ char instance[MAX_INSTANCE_LEN];
+ int type;
+ usbg_function *func;
+
+ switch (usb_func->function_group) {
+ case USB_FUNCTION_GROUP_SIMPLE:
+ type = usbg_lookup_function_type(usb_func->name);
+ if (strlen(usb_func->instance) >= MAX_INSTANCE_LEN)
+ return -ENAMETOOLONG;
+ strncpy(instance, usb_func->instance, MAX_INSTANCE_LEN);
+ instance[MAX_INSTANCE_LEN - 1] = '\0';
+ break;
+ case USB_FUNCTION_GROUP_WITH_SERVICE:
+ type = USBG_F_FFS;
+ ret = snprintf(instance, sizeof(instance), "%s%c%s",
+ usb_func->name, NAME_INSTANCE_SEP,
+ usb_func->instance);
+ if (ret < 0 || ret >= sizeof(instance))
+ return -ENAMETOOLONG;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+
+ func = usbg_get_function(cfs_client->gadget, type, instance);
+ if (!func) {
+ ret = usbg_create_function(cfs_client->gadget,
+ type,
+ instance,
+ NULL, &func);
+ if (ret)
+ return ret;
+
+ if (usb_func->function_group ==
+ USB_FUNCTION_GROUP_WITH_SERVICE) {
+ struct usb_function_with_service *fws;
+
+ fws = container_of(usb_func,
+ struct usb_function_with_service,
+ func);
+ ret = cfs_prep_ffs_service(usb_func->name,
+ usb_func->instance,
+ instance,
+ fws->service);
+ if (ret)
+ return ret;
+ }
+
+ }
+
+ ret = usbg_add_config_function(config, NULL, func);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static int cfs_cleanup_left_configs(struct cfs_client *cfs_client,
+ int last_config)
+{
+ usbg_config *lconfig, *config;
+ int ret;
+
+ lconfig = usbg_get_config(cfs_client->gadget, last_config, NULL);
+ for (config = usbg_get_next_config(lconfig);
+ config;
+ config = usbg_get_next_config(lconfig)) {
+ ret = usbg_rm_config(config, USBG_RM_RECURSE);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cfs_reconfigure_gadget(struct usb_client *usb,
+ struct usb_gadget *gadget)
+{
+ struct cfs_client *cfs_client;
+ int i;
+ int ret;
+
+ if (!usb)
+ return -EINVAL;
+
+ cfs_client = container_of(usb, struct cfs_client,
+ client);
+
+ if (!usb || !gadget || !cfs_is_gadget_supported(usb, gadget))
+ return -EINVAL;
+
+ ret = cfs_set_gadget_attrs(cfs_client, &gadget->attrs);
+ if (ret)
+ goto out;
+
+ for (i = 0; gadget->strs && gadget->strs[i].lang_code > 0; ++i) {
+ ret = cfs_set_gadget_strs(cfs_client, gadget->strs + i);
+ if (ret)
+ goto out;
+ }
+
+ for (i = 0; gadget->configs && gadget->configs[i]; ++i) {
+ ret = cfs_set_gadget_config(cfs_client, i + 1,
+ gadget->configs[i]);
+ if (ret)
+ goto out;
+ }
+
+ ret = cfs_cleanup_left_configs(cfs_client, i);
+
+ /* TODO
+ * Cleanup things which are left after previous gadget
+ */
+out:
+ return ret;
+}
+
+static int cfs_enable(struct usb_client *usb)
+{
+ struct cfs_client *cfs_client;
+
+ if (!usb)
+ return -EINVAL;
+
+ cfs_client = container_of(usb, struct cfs_client,
+ client);
+
+ return usbg_enable_gadget(cfs_client->gadget, cfs_client->udc);
+}
+
+static int cfs_disable(struct usb_client *usb)
+{
+ struct cfs_client *cfs_client;
+
+ if (!usb)
+ return -EINVAL;
+
+ cfs_client = container_of(usb, struct cfs_client,
+ client);
+
+ return usbg_disable_gadget(cfs_client->gadget);
+}
+
+EXPORT
+int hw_cfs_gadget_open(struct hw_info *info,
+ const char *id, struct hw_common **common)
+{
+ struct cfs_client *cfs_client;
+ int ret;
+
+ if (!info || !common)
+ return -EINVAL;
+
+ cfs_client = zalloc(sizeof(*cfs_client));
+ if (!cfs_client)
+ return -ENOMEM;
+
+ ret = usbg_init(CONFIGFS_PATH, &cfs_client->ctx);
+ if (ret)
+ goto err_usbg_init;
+
+ cfs_client->udc = usbg_get_first_udc(cfs_client->ctx);
+ if (!cfs_client->udc) {
+ ret = -ENODEV;
+ goto err_no_udc;
+ }
+
+ ret = usbg_create_gadget(cfs_client->ctx, CONFIGFS_GADGET_NAME,
+ &default_g_attrs, &default_g_strs,
+ &cfs_client->gadget);
+ if (ret)
+ goto err_create_gadget;
+
+ cfs_client->client.common.info = info;
+ cfs_client->client.get_current_gadget = cfs_get_current_gadget;
+ cfs_client->client.reconfigure_gadget = cfs_reconfigure_gadget;
+ cfs_client->client.is_gadget_supported = cfs_is_gadget_supported;
+ cfs_client->client.is_function_supported = cfs_is_function_supported;
+ cfs_client->client.enable = cfs_enable;
+ cfs_client->client.disable = cfs_disable;
+ cfs_client->client.free_gadget = cfs_free_gadget;
+
+ *common = &cfs_client->client.common;
+ return 0;
+
+err_create_gadget:
+err_no_udc:
+ usbg_cleanup(cfs_client->ctx);
+err_usbg_init:
+ free(cfs_client);
+
+ return ret;
+}
+
+EXPORT
+int hw_cfs_gadget_close(struct hw_common *common)
+{
+ struct cfs_client *cfs_client;
+
+ if (!common)
+ return -EINVAL;
+
+ cfs_client = container_of(common, struct cfs_client,
+ client.common);
+
+ /*
+ * For now we don't check for errors
+ * but we should somehow handle them
+ */
+ usbg_rm_gadget(cfs_client->gadget, USBG_RM_RECURSE);
+ usbg_cleanup(cfs_client->ctx);
+ free(cfs_client);
+
+ return 0;
+}
+
--- /dev/null
+/*
+ * libdevice-node
+ *
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the License);
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <hw/usb_client.h>
+#include <hw/systemd.h>
+#include <hw/shared.h>
+
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#define zalloc(amount) calloc(1, amount)
+
+#define MAX_GADGET_STR_LEN 256
+#define MAX_FUNCS 32
+
+#define LEGACY_ROOTPATH "/sys/class/usb_mode/usb0"
+
+/* Device descriptor values */
+#define LEGACY_ID_VENDOR_PATH LEGACY_ROOTPATH"/idVendor"
+#define LEGACY_ID_PRODUCT_PATH LEGACY_ROOTPATH"/idProduct"
+#define LEGACY_BCD_DEVICE_PATH LEGACY_ROOTPATH"/bcdDevice"
+#define LEGACY_CLASS_PATH LEGACY_ROOTPATH"/bDeviceClass"
+#define LEGACY_SUBCLASS_PATH LEGACY_ROOTPATH"/bDeviceSubClass"
+#define LEGACY_PROTOCOL_PATH LEGACY_ROOTPATH"/bDeviceProtocol"
+
+/* Strings */
+#define LEGACY_IMANUFACTURER_PATH LEGACY_ROOTPATH"/iManufacturer"
+#define LEGACY_IPRODUCT_PATH LEGACY_ROOTPATH"/iProduct"
+#define LEGACY_ISERIAL_PATH LEGACY_ROOTPATH"/iSerial"
+
+/* Functions in each config */
+#define LEGACY_CONFIG_1_PATH LEGACY_ROOTPATH"/funcs_fconf"
+#define LEGACY_CONFIG_2_PATH LEGACY_ROOTPATH"/funcs_sconf"
+/* should be single char */
+#define LEGACY_FUNC_SEP ","
+
+/* ON/OFF switch */
+#define LEGACY_ENABLE_PATH LEGACY_ROOTPATH"/enable"
+#define LEGACY_ENABLE "1"
+#define LEGACY_DISABLE "0"
+
+#define LEGACY_BMATTRIBUTES ((1 << 7) | (1 << 6))
+#define LEGACY_MAX_POWER 500
+
+/* +5 to be always big enough */
+#define INT_BUF_SIZE (sizeof(int)*8 + 5)
+
+#ifndef EXPORT
+#define EXPORT __attribute__ ((visibility("default")))
+#endif
+
+static int get_int_from_file(char *path, int *_val, int base)
+{
+ char buf[INT_BUF_SIZE];
+ char *endptr;
+ long int val;
+ int ret;
+
+ ret = sys_get_str(path, buf, sizeof(buf));
+ if (ret)
+ return ret;
+
+ val = strtol(buf, &endptr, base);
+ if (val == LONG_MIN || val == LONG_MAX ||
+ buf[0] == '\0' || (*endptr != '\0' && *endptr != '\n')
+ || val >= INT_MAX)
+ return -EINVAL;
+
+ *_val = (int)val;
+ return 0;
+}
+
+static int legacy_read_gadget_attrs_strs(struct usb_gadget *gadget)
+{
+ int val;
+ int ret;
+ /* We assume that values received from kernel will be valid */
+#define GET_VALUE_FROM_SYSFS(path, field, type, base) \
+ do { \
+ ret = get_int_from_file(path, &val, base); \
+ if (ret) \
+ return ret; \
+ \
+ gadget->attrs.field = (type)val; \
+ } while (0)
+
+ GET_VALUE_FROM_SYSFS(LEGACY_CLASS_PATH, bDeviceClass, uint8_t, 0);
+ GET_VALUE_FROM_SYSFS(LEGACY_SUBCLASS_PATH, bDeviceSubClass, uint8_t, 0);
+ GET_VALUE_FROM_SYSFS(LEGACY_PROTOCOL_PATH, bDeviceProtocol, uint8_t, 0);
+ GET_VALUE_FROM_SYSFS(LEGACY_ID_VENDOR_PATH, idVendor, uint16_t, 16);
+ GET_VALUE_FROM_SYSFS(LEGACY_ID_PRODUCT_PATH, idProduct, uint16_t, 16);
+ GET_VALUE_FROM_SYSFS(LEGACY_BCD_DEVICE_PATH, bcdDevice, uint16_t, 0);
+#undef GET_VALUE_FROM_SYSFS
+
+#define GET_STRING_FROM_SYSFS(path, field) \
+ do { \
+ char buf[MAX_GADGET_STR_LEN]; \
+ \
+ ret = sys_get_str(path, buf, sizeof(buf)); \
+ if (ret) \
+ goto err_##field; \
+ \
+ gadget->strs[0].field = strdup(buf); \
+ if (!gadget->strs[0].field) { \
+ ret = -ENOMEM; \
+ goto err_##field; \
+ } \
+ } while (0)
+
+ GET_STRING_FROM_SYSFS(LEGACY_IMANUFACTURER_PATH, manufacturer);
+ GET_STRING_FROM_SYSFS(LEGACY_IPRODUCT_PATH, product);
+ GET_STRING_FROM_SYSFS(LEGACY_ISERIAL_PATH, serial);
+#undef GET_STRING_FROM_SYSFS
+
+ return 0;
+
+err_serial:
+ free(gadget->strs[0].product);
+err_product:
+ free(gadget->strs[0].manufacturer);
+err_manufacturer:
+ return ret;
+}
+
+static int legacy_find_func(const char *name)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(_available_funcs); ++i)
+ if (!strcmp(name, _available_funcs[i]->name))
+ return i;
+
+ return -1;
+}
+
+static struct usb_function *legacy_find_func_in_gadget(
+ struct usb_gadget *gadget, const char *name)
+{
+ int i;
+
+ for (i = 0; gadget->funcs[i]; ++i)
+ if (!strcmp(name, gadget->funcs[i]->name))
+ return gadget->funcs[i];
+ return NULL;
+}
+
+static int legacy_alloc_config(int n_funcs, struct usb_configuration **_config)
+{
+ struct usb_configuration *config;
+
+ config = zalloc(sizeof(*config));
+ if (!config)
+ goto out;
+
+ config->strs = calloc(1, sizeof(*config->strs));
+ if (!config->strs)
+ goto free_config;
+
+ config->funcs = calloc(n_funcs + 1, sizeof(*config->funcs));
+ if (!config->funcs)
+ goto free_strs;
+
+ /*
+ * We cannot read correct values
+ * so assume that they are always default
+ */
+ config->attrs.bmAttributs = LEGACY_BMATTRIBUTES;
+ config->attrs.MaxPower = LEGACY_MAX_POWER;
+
+ *_config = config;
+
+ return 0;
+free_strs:
+ free(config->strs);
+free_config:
+ free(config);
+out:
+ return -ENOMEM;
+}
+
+static int legacy_alloc_new_func(struct usb_gadget *gadget, const char *fname,
+ struct usb_function **_func)
+{
+ struct usb_function *func;
+ int ret;
+
+ ret = legacy_find_func(fname);
+ if (ret < 0)
+ return -ENOTSUP;
+
+ ret = _available_funcs[ret]->clone(_available_funcs[ret], &func);
+ if (ret)
+ return ret;
+
+ *_func = func;
+ return 0;
+}
+
+static int legacy_read_config(struct usb_gadget *gadget,
+ char *cpath,
+ struct usb_configuration **_config)
+{
+ struct usb_configuration *config;
+ char buf[MAX_GADGET_STR_LEN];
+ char *begin = buf;
+ char *fname;
+ char *sep = LEGACY_FUNC_SEP;
+ int i, f_cnt;
+ int f_idx;
+ int g_f_idx;
+ int ret;
+
+ ret = sys_get_str(cpath, buf, sizeof(buf));
+ if (ret)
+ return ret;
+
+ /* Empty */
+ if (buf[0] == '\0' || buf[0] == '\n')
+ return 0;
+
+ /* count number of functions in this config */
+ f_cnt = 1;
+ for (i = 0; buf[i] != '\0'; ++i) {
+ if (buf[i] == sep[0])
+ ++f_cnt;
+ if (buf[i] == '\n') /* buf ends with it */
+ buf[i] = 0;
+ }
+
+ ret = legacy_alloc_config(f_cnt, &config);
+ if (ret)
+ return ret;
+
+ for (g_f_idx = 0; gadget->funcs[g_f_idx]; ++g_f_idx);
+
+ f_idx = 0;
+ for (fname = strsep(&begin, sep); fname; fname = strsep(&begin, sep)) {
+ struct usb_function *func;
+
+ func = legacy_find_func_in_gadget(gadget, fname);
+ if (!func) {
+ /* new function not added yet to gadget */
+ ret = legacy_alloc_new_func(gadget, fname, &func);
+ if (ret)
+ goto free_config;
+
+ gadget->funcs[g_f_idx++] = func;
+ }
+
+ config->funcs[f_idx++] = func;
+ }
+
+ *_config = config;
+ return 0;
+free_config:
+ free(config->strs);
+ free(config->funcs);
+ free(config);
+ return ret;
+}
+
+static int legacy_get_current_gadget(struct usb_client *usb,
+ struct usb_gadget **_gadget)
+{
+ struct usb_gadget *gadget;
+ struct usb_gadget_strings *strs;
+ struct usb_configuration **configs;
+ struct usb_function **funcs;
+ int i;
+ int ret = -ENOMEM;
+
+ gadget = zalloc(sizeof(*gadget));
+ if (!gadget)
+ goto out;
+
+ strs = calloc(2, sizeof(*strs));
+ if (!strs)
+ goto free_gadget;
+
+ strs[0].lang_code = 0x409;
+
+ gadget->strs = strs;
+
+ ret = legacy_read_gadget_attrs_strs(gadget);
+ if (ret)
+ goto free_strs;
+
+ /* There will be no more functions than bits in int */
+ funcs = calloc(MAX_FUNCS, sizeof(*funcs));
+ if (!funcs)
+ goto free_strs_with_content;
+
+ gadget->funcs = funcs;
+
+ /* slp-gadget use max 2 confiuration and NULL termination */
+ configs = calloc(3, sizeof(*configs));
+ if (!configs)
+ goto free_funcs;
+
+ gadget->configs = configs;
+
+ ret = legacy_read_config(gadget, LEGACY_CONFIG_1_PATH, configs + 0);
+ if (ret)
+ goto free_configs;
+
+ ret = legacy_read_config(gadget, LEGACY_CONFIG_2_PATH, configs + 1);
+ if (ret)
+ goto free_config_1;
+
+ *_gadget = gadget;
+ return 0;
+
+free_config_1:
+ free(configs[0]->funcs);
+ free(configs[0]->strs);
+ free(configs[0]);
+free_configs:
+ free(configs);
+ for (i = 0; gadget->funcs[i]; ++i)
+ gadget->funcs[i]->free_func(gadget->funcs[i]);
+free_funcs:
+ free(funcs);
+free_strs_with_content:
+ free(gadget->strs[0].manufacturer);
+ free(gadget->strs[0].product);
+ free(gadget->strs[0].serial);
+free_strs:
+ free(gadget->strs);
+free_gadget:
+ free(gadget);
+out:
+ return ret;
+}
+
+static bool legacy_is_function_supported(struct usb_client *usb,
+ struct usb_function *func)
+{
+ int ret;
+
+ /*
+ * TODO
+ * Instead of only checking whether we know this function
+ * we should also parse sysfs to check if it is build into
+ * slp-gadget.
+ */
+ ret = legacy_find_func(func->name);
+
+ return ret >= 0;
+}
+
+static bool legacy_is_gadget_supported(struct usb_client *usb,
+ struct usb_gadget *gadget)
+{
+ int i, j;
+
+ if (!gadget || !gadget->configs || !gadget->funcs)
+ return false;
+
+ /*
+ * TODO
+ * Here is a good place to ensure that serial is immutable
+ */
+ if (gadget->strs) {
+ /* only strings in US_en are allowed */
+ if (gadget->strs[0].lang_code != 0x409 ||
+ gadget->strs[1].lang_code)
+ return false;
+ }
+
+ for (j = 0; gadget->configs[j]; ++j) {
+ struct usb_configuration *config = gadget->configs[j];
+
+ if (config->strs && config->strs[0].lang_code)
+ return false;
+
+ if (!config->funcs)
+ return false;
+
+ for (i = 0; config->funcs[i]; ++i)
+ if (!legacy_is_function_supported(usb, config->funcs[i]))
+ return false;
+ }
+
+ if (j == 0 || j > 2)
+ return false;
+
+ return true;
+}
+
+/* TODO. Maybe move this to sys ? */
+static int legacy_set_int_hex(char *path, int val)
+{
+ char buf[MAX_GADGET_STR_LEN];
+ int r;
+
+ if (!path)
+ return -EINVAL;
+
+ snprintf(buf, sizeof(buf), "%x", val);
+ r = sys_set_str(path, buf);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int legacy_set_gadget_attrs(struct usb_gadget_attrs *attrs)
+{
+ int ret;
+
+ ret = sys_set_int(LEGACY_CLASS_PATH, attrs->bDeviceClass);
+ if (ret)
+ return ret;
+
+ ret = sys_set_int(LEGACY_SUBCLASS_PATH, attrs->bDeviceSubClass);
+ if (ret)
+ return ret;
+
+ ret = sys_set_int(LEGACY_PROTOCOL_PATH, attrs->bDeviceProtocol);
+ if (ret)
+ return ret;
+
+ ret = legacy_set_int_hex(LEGACY_ID_VENDOR_PATH, attrs->idVendor);
+ if (ret)
+ return ret;
+
+ ret = legacy_set_int_hex(LEGACY_ID_PRODUCT_PATH, attrs->idProduct);
+ if (ret)
+ return ret;
+
+ ret = legacy_set_int_hex(LEGACY_BCD_DEVICE_PATH, attrs->bcdDevice);
+
+ return ret;
+}
+
+static int legacy_set_gadget_strs(struct usb_gadget_strings *strs)
+{
+ int ret = 0;
+
+ /*
+ * TODO
+ * Here is a good place to ensure that serial is immutable
+ */
+
+ if (strs->manufacturer) {
+ ret = sys_set_str(LEGACY_IMANUFACTURER_PATH,
+ strs->manufacturer);
+ if (ret)
+ return ret;
+ }
+
+ if (strs->product) {
+ ret = sys_set_str(LEGACY_IPRODUCT_PATH,
+ strs->product);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static int legacy_set_gadget_config(char *cpath,
+ struct usb_configuration *config)
+{
+ char buf[MAX_GADGET_STR_LEN];
+ int left = sizeof(buf);
+ char *pos = buf;
+ int ret;
+ int i;
+
+ if (!config) {
+ buf[0] = '\n';
+ buf[1] = '\0';
+ goto empty_config;
+ }
+
+ for (i = 0; config->funcs[i]; ++i) {
+ ret = snprintf(pos, left, "%s" LEGACY_FUNC_SEP,
+ config->funcs[i]->name);
+ if (ret >= left)
+ return -EOVERFLOW;
+
+ pos += ret;
+ left -= ret;
+ }
+
+ /* eliminate last separator */
+ *(pos - 1) = '\0';
+
+empty_config:
+ return sys_set_str(cpath, buf);
+}
+
+static int legacy_reconfigure_gadget(struct usb_client *usb,
+ struct usb_gadget *gadget)
+{
+ int ret;
+
+ if (!usb || !gadget || !legacy_is_gadget_supported(usb, gadget))
+ return -EINVAL;
+
+ ret = legacy_set_gadget_attrs(&gadget->attrs);
+ if (ret)
+ return ret;
+
+ if (gadget->strs) {
+ ret = legacy_set_gadget_strs(gadget->strs + 0);
+ if (ret)
+ return ret;
+ }
+
+ ret = legacy_set_gadget_config(LEGACY_CONFIG_1_PATH, gadget->configs[0]);
+ if (ret)
+ return ret;
+
+ ret = legacy_set_gadget_config(LEGACY_CONFIG_2_PATH, gadget->configs[1]);
+
+ return ret;
+}
+
+static int legacy_enable(struct usb_client *usb)
+{
+ int ret;
+ int i;
+ struct usb_gadget *gadget;
+ struct usb_function_with_service *fws;
+
+ ret = sys_set_str(LEGACY_ENABLE_PATH,
+ LEGACY_ENABLE);
+ if (ret < 0)
+ return ret;
+
+ ret = legacy_get_current_gadget(usb, &gadget);
+ if (ret < 0)
+ goto disable_gadget;
+
+ for (i = 0; gadget->funcs[i]; ++i) {
+ if (gadget->funcs[i]->function_group !=
+ USB_FUNCTION_GROUP_WITH_SERVICE)
+ continue;
+
+ fws = container_of(gadget->funcs[i],
+ struct usb_function_with_service, func);
+ ret = systemd_start_service(fws->service);
+ if (ret < 0)
+ goto stop_services;
+ }
+
+ return 0;
+stop_services:
+ while (--i >= 0) {
+ if (gadget->funcs[i]->function_group !=
+ USB_FUNCTION_GROUP_WITH_SERVICE)
+ continue;
+
+ fws = container_of(gadget->funcs[i],
+ struct usb_function_with_service, func);
+ systemd_stop_service(fws->service);
+ }
+
+disable_gadget:
+ sys_set_str(LEGACY_ENABLE_PATH, LEGACY_DISABLE);
+ return ret;
+}
+
+static int legacy_disable(struct usb_client *usb)
+{
+ int ret;
+ int i;
+ struct usb_gadget *gadget;
+ struct usb_function_with_service *fws;
+
+ ret = legacy_get_current_gadget(usb, &gadget);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; gadget->funcs[i]; ++i) {
+ if (gadget->funcs[i]->function_group != USB_FUNCTION_GROUP_WITH_SERVICE)
+ continue;
+
+ fws = container_of(gadget->funcs[i], struct usb_function_with_service, func);
+ ret = systemd_stop_service(fws->service);
+ if (ret < 0)
+ return ret;
+ }
+
+ return sys_set_str(LEGACY_ENABLE_PATH, LEGACY_DISABLE);
+}
+
+static void legacy_free_config(struct usb_configuration *config)
+{
+ int i;
+
+ if (!config)
+ return;
+
+ if (config->strs) {
+ for (i = 0; config->strs[i].lang_code; ++i)
+ free(config->strs[i].config_str);
+
+ free(config->strs);
+ }
+
+ /*
+ * Each function will be free later,
+ * for now we cleanup only pointers.
+ */
+ if (config->funcs)
+ free(config->funcs);
+
+ free(config);
+}
+
+static void legacy_free_gadget(struct usb_gadget *gadget)
+{
+ int i;
+
+ if (!gadget)
+ return;
+
+ if (gadget->strs) {
+ for (i = 0; gadget->strs[i].lang_code; ++i) {
+ free(gadget->strs[i].manufacturer);
+ free(gadget->strs[i].product);
+ free(gadget->strs[i].serial);
+ }
+ free(gadget->strs);
+ }
+
+ if (gadget->configs) {
+ for (i = 0; gadget->configs[i]; ++i)
+ legacy_free_config(gadget->configs[i]);
+
+ free(gadget->configs);
+ }
+
+ if (gadget->funcs) {
+ for (i = 0; gadget->funcs[i]; ++i)
+ gadget->funcs[i]->free_func(gadget->funcs[i]);
+
+ free(gadget->funcs);
+ }
+}
+
+EXPORT
+int hw_legacy_gadget_open(struct hw_info *info,
+ const char *id, struct hw_common **common)
+{
+ struct usb_client *legacy;
+
+ if (!info || !common)
+ return -EINVAL;
+
+ /* check if slp usb gadget exists */
+ if (access("/sys/class/usb_mode/usb0/enable", F_OK))
+ return -ENOENT;
+
+ legacy = zalloc(sizeof(*legacy));
+ if (!legacy)
+ return -ENOMEM;
+
+ legacy->common.info = info;
+ legacy->get_current_gadget = legacy_get_current_gadget;
+ legacy->reconfigure_gadget = legacy_reconfigure_gadget;
+ legacy->is_gadget_supported = legacy_is_gadget_supported;
+ legacy->is_function_supported = legacy_is_function_supported;
+ legacy->enable = legacy_enable;
+ legacy->disable = legacy_disable;
+ legacy->free_gadget = legacy_free_gadget;
+
+ *common = &legacy->common;
+ return 0;
+}
+
+EXPORT
+int hw_legacy_gadget_close(struct hw_common *common)
+{
+ struct usb_client *legacy;
+
+ if (!common)
+ return -EINVAL;
+
+ legacy = container_of(common, struct usb_client,
+ common);
+
+ free(legacy);
+ return 0;
+}
projects / platform / core / system / libdevice-node.git / commitdiff