summaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/legacy/acm_ms.c
blob: c16089efc3224124c3960e45e13819e17406c267 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
/*
 * 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
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#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)
{
	struct fsg_opts *opts;
	int	status;

	if (gadget_is_otg(c->cdev->gadget)) {
		c->descriptors = otg_desc;
		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
	}

	opts = fsg_opts_from_func_inst(fi_msg);

	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 = fsg_common_run_thread(opts->common);
	if (status)
		goto remove_acm;

	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)
			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");