diff options
| -rw-r--r-- | hw/usb_client/usb_client_configfs.c | 771 |
1 files changed, 771 insertions, 0 deletions
diff --git a/hw/usb_client/usb_client_configfs.c b/hw/usb_client/usb_client_configfs.c new file mode 100644 index 0000000..c16eae7 --- /dev/null +++ b/hw/usb_client/usb_client_configfs.c @@ -0,0 +1,771 @@ +/* + * device-node + * + * Copyright (c) 2016 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 "../shared.h" + +#include <limits.h> +#include <stdio.h> +#include <string.h> +#include <usbg/usbg.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" + +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 int cfs_find_func(const char *name, const char *instance) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(_available_funcs); ++i) + if (!strcmp(name, _available_funcs[i]->name) && + !strcmp(instance, _available_funcs[i]->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 (!strcmp(name, gadget->funcs[i]->name) + && !strcmp(instance, gadget->funcs[i]->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; + 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[0].manufacturer); + free(usb_gadget->strs[0].product); + free(usb_gadget->strs[0].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) +{ + int ret; + + /* for now only simple functions without userspace service */ + if (func->function_group != USB_FUNCTION_GROUP_SIMPLE) + return false; + + /* + * TODO + * Instead of only checking whether we know this function + * we should also somehow check that it's realy available + * in our kernel. + */ + ret = usbg_lookup_function_type(func->name); + + return ret > 0; +} + +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_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]; + int type = usbg_lookup_function_type(usb_func->name); + usbg_function *func; + + func = usbg_get_function(cfs_client->gadget, + type, usb_func->instance); + if (!func) { + ret = usbg_create_function(cfs_client->gadget, + type, + usb_func->instance, + NULL, &func); + 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); +} + +static int 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; +} + +static int 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; +} + +HARDWARE_MODULE_STRUCTURE = { + .magic = HARDWARE_INFO_TAG, + .hal_version = HARDWARE_INFO_VERSION, + .device_version = USB_CLIENT_HARDWARE_DEVICE_VERSION, + .id = USB_CLIENT_HARDWARE_DEVICE_ID, + .name = "cfs-gadget", + .open = cfs_gadget_open, + .close = cfs_gadget_close, +}; |