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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/gadget/legacy/acm_ms.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/gadget/legacy/acm_ms.c')
-rw-r--r-- | drivers/usb/gadget/legacy/acm_ms.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/drivers/usb/gadget/legacy/acm_ms.c b/drivers/usb/gadget/legacy/acm_ms.c new file mode 100644 index 000000000..e8033e5f0 --- /dev/null +++ b/drivers/usb/gadget/legacy/acm_ms.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * acm_ms.c -- Composite driver, with ACM and mass storage support + * + * Copyright (C) 2008 David Brownell + * Copyright (C) 2008 Nokia Corporation + * Author: David Brownell + * Modified: Klaus Schwarzkopf <schwarzkopf@sensortherm.de> + * + * Heavily based on multi.c and cdc2.c + */ + +#include <linux/kernel.h> +#include <linux/module.h> + +#include "u_serial.h" + +#define DRIVER_DESC "Composite Gadget (ACM + MS)" +#define DRIVER_VERSION "2011/10/10" + +/*-------------------------------------------------------------------------*/ + +/* + * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! + * Instead: allocate your own, using normal USB-IF procedures. + */ +#define ACM_MS_VENDOR_NUM 0x1d6b /* Linux Foundation */ +#define ACM_MS_PRODUCT_NUM 0x0106 /* Composite Gadget: ACM + MS*/ + +#include "f_mass_storage.h" + +/*-------------------------------------------------------------------------*/ +USB_GADGET_COMPOSITE_OPTIONS(); + +static struct usb_device_descriptor device_desc = { + .bLength = sizeof device_desc, + .bDescriptorType = USB_DT_DEVICE, + + /* .bcdUSB = DYNAMIC */ + + .bDeviceClass = USB_CLASS_MISC /* 0xEF */, + .bDeviceSubClass = 2, + .bDeviceProtocol = 1, + + /* .bMaxPacketSize0 = f(hardware) */ + + /* Vendor and product id can be overridden by module parameters. */ + .idVendor = cpu_to_le16(ACM_MS_VENDOR_NUM), + .idProduct = cpu_to_le16(ACM_MS_PRODUCT_NUM), + /* .bcdDevice = f(hardware) */ + /* .iManufacturer = DYNAMIC */ + /* .iProduct = DYNAMIC */ + /* NO SERIAL NUMBER */ + /*.bNumConfigurations = DYNAMIC*/ +}; + +static const struct usb_descriptor_header *otg_desc[2]; + +/* string IDs are assigned dynamically */ +static struct usb_string strings_dev[] = { + [USB_GADGET_MANUFACTURER_IDX].s = "", + [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC, + [USB_GADGET_SERIAL_IDX].s = "", + { } /* end of list */ +}; + +static struct usb_gadget_strings stringtab_dev = { + .language = 0x0409, /* en-us */ + .strings = strings_dev, +}; + +static struct usb_gadget_strings *dev_strings[] = { + &stringtab_dev, + NULL, +}; + +/****************************** Configurations ******************************/ + +static struct fsg_module_parameters fsg_mod_data = { .stall = 1 }; +#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_GADGET_DEBUG_FILES */ + +FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data); + +/*-------------------------------------------------------------------------*/ +static struct usb_function *f_acm; +static struct usb_function_instance *f_acm_inst; + +static struct usb_function_instance *fi_msg; +static struct usb_function *f_msg; + +/* + * We _always_ have both ACM and mass storage functions. + */ +static int acm_ms_do_config(struct usb_configuration *c) +{ + int status; + + if (gadget_is_otg(c->cdev->gadget)) { + c->descriptors = otg_desc; + c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; + } + + f_acm = usb_get_function(f_acm_inst); + if (IS_ERR(f_acm)) + return PTR_ERR(f_acm); + + f_msg = usb_get_function(fi_msg); + if (IS_ERR(f_msg)) { + status = PTR_ERR(f_msg); + goto put_acm; + } + + status = usb_add_function(c, f_acm); + if (status < 0) + goto put_msg; + + status = usb_add_function(c, f_msg); + if (status) + goto remove_acm; + + return 0; +remove_acm: + usb_remove_function(c, f_acm); +put_msg: + usb_put_function(f_msg); +put_acm: + usb_put_function(f_acm); + return status; +} + +static struct usb_configuration acm_ms_config_driver = { + .label = DRIVER_DESC, + .bConfigurationValue = 1, + /* .iConfiguration = DYNAMIC */ + .bmAttributes = USB_CONFIG_ATT_SELFPOWER, +}; + +/*-------------------------------------------------------------------------*/ + +static int acm_ms_bind(struct usb_composite_dev *cdev) +{ + struct usb_gadget *gadget = cdev->gadget; + struct fsg_opts *opts; + struct fsg_config config; + int status; + + f_acm_inst = usb_get_function_instance("acm"); + if (IS_ERR(f_acm_inst)) + return PTR_ERR(f_acm_inst); + + fi_msg = usb_get_function_instance("mass_storage"); + if (IS_ERR(fi_msg)) { + status = PTR_ERR(fi_msg); + goto fail_get_msg; + } + + /* set up mass storage function */ + fsg_config_from_params(&config, &fsg_mod_data, fsg_num_buffers); + opts = fsg_opts_from_func_inst(fi_msg); + + opts->no_configfs = true; + status = fsg_common_set_num_buffers(opts->common, fsg_num_buffers); + if (status) + goto fail; + + status = fsg_common_set_cdev(opts->common, cdev, config.can_stall); + if (status) + goto fail_set_cdev; + + fsg_common_set_sysfs(opts->common, true); + status = fsg_common_create_luns(opts->common, &config); + if (status) + goto fail_set_cdev; + + fsg_common_set_inquiry_string(opts->common, config.vendor_name, + config.product_name); + /* + * Allocate string descriptor numbers ... note that string + * contents can be overridden by the composite_dev glue. + */ + status = usb_string_ids_tab(cdev, strings_dev); + if (status < 0) + goto fail_string_ids; + device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id; + device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id; + + if (gadget_is_otg(gadget) && !otg_desc[0]) { + struct usb_descriptor_header *usb_desc; + + usb_desc = usb_otg_descriptor_alloc(gadget); + if (!usb_desc) { + status = -ENOMEM; + goto fail_string_ids; + } + usb_otg_descriptor_init(gadget, usb_desc); + otg_desc[0] = usb_desc; + otg_desc[1] = NULL; + } + + /* register our configuration */ + status = usb_add_config(cdev, &acm_ms_config_driver, acm_ms_do_config); + if (status < 0) + goto fail_otg_desc; + + usb_composite_overwrite_options(cdev, &coverwrite); + dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n", + DRIVER_DESC); + return 0; + + /* error recovery */ +fail_otg_desc: + kfree(otg_desc[0]); + otg_desc[0] = NULL; +fail_string_ids: + fsg_common_remove_luns(opts->common); +fail_set_cdev: + fsg_common_free_buffers(opts->common); +fail: + usb_put_function_instance(fi_msg); +fail_get_msg: + usb_put_function_instance(f_acm_inst); + return status; +} + +static int acm_ms_unbind(struct usb_composite_dev *cdev) +{ + usb_put_function(f_msg); + usb_put_function_instance(fi_msg); + usb_put_function(f_acm); + usb_put_function_instance(f_acm_inst); + kfree(otg_desc[0]); + otg_desc[0] = NULL; + + return 0; +} + +static struct usb_composite_driver acm_ms_driver = { + .name = "g_acm_ms", + .dev = &device_desc, + .max_speed = USB_SPEED_SUPER, + .strings = dev_strings, + .bind = acm_ms_bind, + .unbind = acm_ms_unbind, +}; + +module_usb_composite_driver(acm_ms_driver); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Klaus Schwarzkopf <schwarzkopf@sensortherm.de>"); +MODULE_LICENSE("GPL v2"); |